Storage battery unit and storage battery device

Abstract

To provide a technique capable of varying power storage capacity of facilitating inventory management of a storage battery device and suppressing erroneous wiring in connection.SOLUTION: A storage battery unit which accommodates a storage battery module within a housing comprises the same housing face where a first terminal connected to one of a positive electrode side and a negative electrode side of a first storage battery module, a second terminal connected to the other electrode side, a third terminal connected to one of a positive electrode side and a negative electrode side of a second storage battery module, and a fourth terminal connected to the other electrode side of the second storage battery module are disposed. The first terminal and the fourth terminal are disposed at one end side of the housing face in such a manner that a polarity of the first storage battery module connected to the first terminal is different from a polarity of the second storage battery module connected to the fourth terminal. The second terminal and the third terminal are disposed at the other end side and disposed in such a manner that a first distance between the first terminal and the fourth terminal and a second distance between the second terminal and the third terminal satisfy a predetermined condition.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a storage battery unit and a storage battery device with variable power storage capacity. [Background technology]

[0002] Conventionally, power generation systems equipped with solar power generation modules or the like and storage battery systems interconnected with power grids that supply commercial power have been known. Storage battery systems constitute distributed power sources at consumers, and are configured to store the power generated by the power generation system or store the power supplied from the power grid during times when rates are cheaper, such as at night, so that the stored power can be supplied to a load when needed. Storage battery systems are available in, for example, a separate type in which a storage battery device incorporating a storage battery module is separated from a power conditioner having a power conversion unit that performs power conversion related to the charging and discharging of the storage battery device, or an integrated type in which the storage battery module and the power conversion unit are integrated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-196185 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when a storage battery system is configured as a separate type, storage battery devices are installed according to the power situation of the consumer and the configuration and scale of the distributed power source. Businesses such as manufacturers and distributors that provide storage battery devices to consumers have had to individually prepare multiple types of storage battery devices with different storage capacities (kWh) (e.g., 5 kWh, 10 kWh, 15 kWh, etc.) to accommodate the power situation of the consumer side. Businesses that provide storage battery devices have had to keep storage battery devices manufactured for each capacity in inventory, and managing this product inventory has been an issue.

[0005] For example, the size, weight, and price of a storage battery device increase relatively in proportion to the storage capacity. For this reason, a 15kWh storage battery device requires a relatively larger storage space than a 5kWh storage battery device. Furthermore, the packaged weight of a 15kWh storage battery device exceeds 150kg, which places many constraints on inventory storage. If the storage period is prolonged, the battery modules built into the storage battery device will inevitably deteriorate. For small-scale retailers, it can be difficult to manage inventory of multiple types of storage battery devices with different storage capacities (kWh).

[0006] To reduce the number of different capacity types of storage battery devices, as disclosed in Patent Document 1, for example, a storage battery device can be configured with storage battery modules of a single capacity, and the number of storage battery devices can be increased or decreased depending on the consumer's power situation, thereby providing the storage capacity desired by the consumer. However, this configuration requires the power conditioner to be equipped with a power conversion unit corresponding to the number of storage battery devices, which increases the cost of the power conditioner and may lead to incorrect wiring when connecting multiple storage battery devices to the power conditioner. Furthermore, this also creates a new problem of having to keep a stock of different types of power conditioners corresponding to the number of storage battery devices.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide technology that makes it easy to manage inventory of storage battery devices, prevents incorrect wiring during connection, and enables the storage capacity to be varied. [Means for solving the problem]

[0008] One aspect of the disclosed technology for solving the above problem is: A storage battery unit that houses at least one storage battery module having a unit capacity in a housing, a first terminal connected to one of the positive and negative sides of a first storage battery module; and a second terminal connected to the other of the positive and negative sides of the first storage battery module; a third terminal connected to one of the positive electrode side or the negative electrode side of a second storage battery module and a fourth terminal connected to the other of the positive electrode side or the negative electrode side of the second storage battery module are disposed on the same housing surface; the first terminal and the fourth terminal are arranged on one end side of the housing surface such that a polarity of the first storage battery module connected to the first terminal differs from a polarity of the second storage battery module connected to the fourth terminal, and the second terminal and the third terminal are arranged on the other end side of the housing surface such that a polarity of the first storage battery module connected to the second terminal differs from a polarity of the second storage battery module connected to the third terminal; The first terminal and the fourth terminal are disposed so that a first distance between the first terminal and the fourth terminal and a second distance between the second terminal and the third terminal satisfy a predetermined condition. It is characterized by:

[0009] This allows for the configuration of a storage battery device in which the storage capacity can be adjusted according to the power supply situation of the consumer, the configuration and scale of the distributed power source, and the like, using storage battery units 12, each having a storage battery module with a unit capacity within a housing, as a constituent unit. The positive and negative terminals connected to the storage battery modules built into storage battery unit 12 are arranged in a positional relationship within a single housing surface to prevent incorrect connection. Therefore, for example, the storage capacity obtained by serially connecting the second and third terminals arranged on the other end (e.g., lower side) of the connector arrangement surface of two storage battery modules 12b housed in storage battery unit 12 can be provided to the outside via the first and fourth terminals arranged on one end (e.g., upper side) of the connector arrangement surface. A storage battery device using storage battery units 12 as constituent units allows for easy inventory management, minimizes restrictions on storage of the storage battery device due to its size and weight, and prevents incorrect connection.

[0010] In one embodiment of the disclosed technology, a connection cable may be provided having a first fitting terminal at one end that fits with the first terminal and a second fitting terminal at the other end that fits with the second terminal, the first fitting terminal being fitable with the third terminal and the second fitting terminal being fitable with the fourth terminal, wherein the second distance is a distance at which the second terminal and the third terminal can be connected by the connection cable having a predetermined length, and a distance at which the first terminal and the second terminal and the third terminal and the fourth terminal cannot be connected by the connection cable, and the first distance is a distance at which the first terminal and the fourth terminal cannot be connected by the connection cable. This allows a storage battery device to be configured by including in its basic configuration a dedicated DC connection cable 14 having a predetermined length for connecting a positive terminal connected to one storage battery module and a negative terminal connected to the other storage battery module. The dedicated DC connection cable 14 does not connect the positive terminal connected to one storage battery module arranged at one end (e.g., the upper side) of the connector arrangement surface to the negative terminal connected to the other storage battery module, but connects the negative terminal connected to one storage battery module arranged at the other end (e.g., the lower side) of the connector arrangement surface to the positive terminal connected to the other storage battery module. As a result, a storage capacity twice the unit capacity can be provided when storage battery modules of the same unit capacity are directly connected. In addition, incorrect connection to the storage battery unit 12 when configuring the storage battery device can be prevented.

[0011] In one embodiment of the disclosed technique, a first fitting terminal is provided at one end to be fitted into the first terminal. a connection cable having at its other end a second fitting terminal that fits into the second terminal, wherein the first fitting terminal is fittable with the third terminal and the second fitting terminal is fittable with the fourth terminal, the first distance is a distance that the first terminal and the fourth terminal can be connected by the connection cable having a predetermined length for connecting the second terminal and the third terminal, and a circuit that cuts off overcurrent may be provided in a connection path between an electrode of the first storage battery module connected to the first terminal or the second terminal, or in a connection path between an electrode of the second storage battery module connected to the third terminal or the fourth terminal. Thus, even if a storage battery module in a storage battery unit connected in series is short-circuited due to incorrect connection of the DC connection cable 14, the overcurrent flowing in the path can be cut off, thereby protecting the storage battery module.

[0012] In addition, in one embodiment of the disclosed technology, A storage battery unit that houses at least one storage battery module having a unit capacity in a housing, a first terminal connected to one of the positive and negative sides of a first storage battery module; and a second terminal connected to the other of the positive and negative sides of the first storage battery module; a third terminal and a fourth terminal connected to the third terminal by a wiring are disposed on the same housing surface; the first terminal and the fourth terminal are arranged on one end side of the housing surface, and the second terminal and the third terminal are arranged on the other end side of the housing surface, The first terminal and the fourth terminal are disposed so that a first distance between the first terminal and the fourth terminal and a second distance between the second terminal and the third terminal satisfy a predetermined condition. It is characterized by:

[0013] Even in this configuration, a storage battery device can be constructed that uses the storage battery unit 12 as a constituent unit and allows the storage capacity to be varied according to the unit capacity of the storage battery module, the power situation of the consumer, the configuration and scale of the distributed power source, etc., thereby preventing incorrect connection.

[0014] In addition, in one embodiment of the disclosed technology, A storage battery unit that houses at least one storage battery module having a unit capacity in a housing, a first housing surface on which a first terminal connected to one of the positive and negative sides of a first storage battery module and a second terminal connected to the other of the positive and negative sides of the first storage battery module are disposed; a second housing surface on which a third terminal connected to one of the positive electrode side or the negative electrode side of a second storage battery module and a fourth terminal connected to the other of the positive electrode side or the negative electrode side of the second storage battery module are disposed; The first terminal is disposed on one end side of the first housing surface, the second terminal is disposed on the other end side of the first housing surface, the fourth terminal is disposed on one end side of the second housing surface, and the third terminal is disposed on the other end side, the polarity of the first storage battery module connected to a first terminal arranged on one end side of the first housing surface is different from the polarity of the second storage battery module connected to a fourth terminal arranged on one end side of the second housing surface; The first terminal and the second terminal arranged on the first housing surface, and the third terminal and the fourth terminal arranged on the second housing surface are connection cables each having a predetermined length, and each having a first mating terminal at one end that fits into the first terminal and a second mating terminal at the other end that fits into the second terminal, and the first mating terminal is arranged at a distance that prevents connection by a connection cable configured to be matable with the third terminal and the second mating terminal is matable with the fourth terminal. It is characterized by:

[0015] Even in this configuration, a storage battery device can be configured in which the storage battery units 12 are used as structural units, and the storage capacity can be varied according to the unit capacity of the storage battery modules in accordance with the power supply situation of the consumer, the configuration and scale of the distributed power source, and the like. Terminals (e.g., first terminals and second terminals) connected to the electrodes (positive and negative electrodes) of one storage battery module 12b1 can be arranged on one of the housing surfaces of the storage battery unit 12, and terminals (e.g., third terminals and fourth terminals) connected to the electrodes (positive and negative electrodes) of the other storage battery module 12b2 can be arranged separately on another housing surface different from the above housing surface. When building a storage battery device using storage battery units 12 as structural units, a contractor or the like can visually identify the destinations of the inter-unit connections via DC cables 14, thereby improving the effectiveness of preventing incorrect connections.

[0016] In one embodiment of the disclosed technology, the first housing surface and the second housing surface may be configured as opposing surfaces of a housing that houses the first storage battery module and the second storage battery module. This allows terminals connected to the electrodes of the first and second storage battery modules 12b to be arranged separately on each of the opposing housing surfaces of the storage battery unit 12. In a storage battery device including storage battery units 12 as its constituent units, for example, it is possible to separate the terminal group connected to the electrodes of the first storage battery module 12b on one opposing side (e.g., the left side) and the terminal group connected to the electrodes of the first storage battery module 12b on the other opposing side (e.g., the right side). This further enhances the effectiveness of preventing incorrect connection between units using DC cables 14 and is expected to improve work efficiency.

[0017] In one embodiment of the disclosed technology, a third terminal and a fourth terminal connected to the third terminal by a wire may be arranged on the second housing surface. Even in this embodiment, the effect of preventing erroneous connection between units using the DC connection cable 14 can be further improved.

[0018] In one embodiment of the disclosed technology, the first and second terminals arranged on the first housing surface and the third and fourth terminals arranged on the second housing surface may be configured as terminals of a single type, and the first and second mating terminals provided on the connection cable may be configured as mating terminals that can be mated with the terminals of the single type. This eliminates the need to check the cable orientation (the type of connector that can be mated with terminals T1, T2, such as male or female) when connecting units of a storage battery system consisting of storage battery units 12. This improves workability. Furthermore, cost reductions can be expected by consolidating the types of components used for connecting units.

[0019] In addition, in one embodiment of the disclosed technology, A storage battery apparatus including a plurality of storage battery units according to any one of claims 1 to 4, a connection cable having a first fitting terminal at one end adapted to fit into the first terminal and a second fitting terminal at the other end adapted to fit into the second terminal, the first fitting terminal being adapted to be able to fit into the third terminal, and the second fitting terminal being adapted to be able to fit into the fourth terminal; a second terminal arranged on a housing surface of a first storage battery unit and a first terminal arranged on a housing surface of a second storage battery unit, and a third terminal arranged on a housing surface of the first storage battery unit and a fourth terminal arranged on a housing surface of the second storage battery unit are connected by the connection cable, the length of which is specified in advance, to connect the second terminal and the third terminal; It is characterized by:

[0020] This allows for the configuration of a storage battery device with variable power storage capacity, based on the storage battery units 12 and DC connection cables 14. Storage battery devices are easy to manage because at least one type of storage battery unit 12 and one type of connection cable 14 can be managed as inventory, minimizing storage battery device storage constraints due to size and weight. The storage battery device connects the storage battery modules 12b in multiple storage battery units 12 in series using dedicated DC connection cables 14 with predetermined lengths, allowing the consumer to configure the desired power storage capacity. Furthermore, because multiple storage battery units 12 are connected using dedicated DC connection cables 14, incorrect connections can be prevented.

[0021] In addition, in one embodiment of the disclosed technology, A storage battery apparatus including a plurality of storage battery units according to any one of claims 5 to 8, a connection cable having a first fitting terminal at one end adapted to fit into the first terminal and a second fitting terminal at the other end adapted to fit into the second terminal, the first fitting terminal being adapted to be able to fit into the third terminal, and the second fitting terminal being adapted to be able to fit into the fourth terminal; a second terminal arranged on the first housing surface of the first storage battery unit and a first terminal arranged on the first housing surface of the second storage battery unit, and a fourth terminal arranged on the second housing surface of the first storage battery unit and a third terminal arranged on the second housing surface of the second storage battery unit are connected by the connection cable, the length of which is specified in advance to connect the second terminal arranged on the first housing surface of the first storage battery unit and the first terminal arranged on the first housing surface of the second storage battery unit; It is characterized by:

[0022] Even in this configuration, a storage battery system with variable storage capacity can be configured using the storage battery units 12 and DC connection cables 14 as basic components. Storage battery systems can be easily managed because at least one type of storage battery unit 12 and one type of DC connection cable 14 can be managed as inventory, minimizing storage battery system storage constraints due to size and weight. The storage battery system can configure the storage capacity desired by the consumer by connecting the storage battery modules 12b in multiple storage battery units 12 in series using dedicated DC connection cables 14 with predetermined lengths. Furthermore, multiple storage battery units 12 are connected via dedicated DC connection cables 14 to terminal groups arranged separately on different housing surfaces, improving workability and preventing incorrect connection.

[0023] In one embodiment of the disclosed technology, the first terminal is arranged on a first housing surface and the second terminal is arranged on a second housing surface opposite to the first housing surface, and the first terminal arranged on the first housing surface and the second terminal arranged on the second housing surface are connected by a wiring mechanism, and the first terminal arranged on the first housing surface of the mount and the second terminal arranged on the first housing surface of the second storage battery unit, and the second terminal arranged on the second housing surface of the mount and the third terminal arranged on the second housing surface of the second storage battery unit may be further connected by the connection cable. In the battery unit 12, for example, one battery module 12b1 and the other battery module 12b2 can be connected in series via the wiring mechanism of the mount, so that the DC connection cable 14 that connects the battery modules can be omitted. In this case, the DC connection cable 14 can be used to connect only to terminal groups that are separately arranged on different housing surfaces of the multiple storage battery units 12, which is expected to further improve workability and prevent incorrect connections.

[0024] In one embodiment of the disclosed technology, the first and second mating terminals of the connection cable may be configured as the same mating terminal. This allows the connectors at both ends of the DC connection cable 14a to be the same when connecting units of a storage battery system consisting of storage battery units 12. This eliminates the need to check the orientation of the cable (the type of connector that can be mated with terminals T1, T2, such as male or female), improving workability. Furthermore, cost reductions can be expected due to the consolidation of component types related to unit connection. [Effects of the Invention]

[0025] According to the present invention, it is possible to provide a technology that allows easy inventory management of battery devices, prevents incorrect wiring during connection, and enables variable storage capacity. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a block diagram showing a schematic configuration of a distributed power supply system according to an embodiment of the present invention; [Figure 2] 1 is a diagram illustrating the configuration of a separate-type storage battery system according to an embodiment of the present invention. FIG. [Figure 3] FIG. 10 is a diagram illustrating an example of another configuration of a separated-type storage battery system according to an embodiment of the present invention. [Figure 4] 1 is a block diagram showing a schematic configuration of a storage battery device according to an embodiment of the present invention; [Figure 5] 1 is a diagram illustrating the arrangement of terminals T1 and T2 provided on the same housing surface of a storage battery unit according to an embodiment of the present invention. [Figure 6] 10A and 10B are diagrams illustrating configuration examples of a storage battery device according to an embodiment of the present invention in other capacity forms. [Figure 7] FIG. 10 is a diagram illustrating a connection configuration between storage battery units in a first modified example of the present invention. [Figure 8] FIG. 10 is a block diagram showing a schematic configuration of a storage battery device according to a second modification of the present invention. [Figure 9]10 is a diagram illustrating a configuration example of a storage battery device according to Modification 2 of the present invention in another capacity mode. FIG. [Figure 10] FIG. 10 is a block diagram showing a schematic configuration of a storage battery device according to a third modified example of the present invention. [Figure 11] 10 is a diagram illustrating a configuration example of a storage battery device according to Modification 3 of the present invention in another capacity mode. FIG. [Figure 12] FIG. 10 is a diagram illustrating another configuration of a storage battery device according to Modification 3 of the present invention. [Figure 13] FIG. 10 is a block diagram showing a schematic configuration of a storage battery device according to a fourth modified example of the present invention. [Figure 14] FIG. 10 is a block diagram showing a schematic configuration of a storage battery device according to a fifth modified example of the present invention. [Figure 15] FIG. 10 is a diagram illustrating a configuration example of a storage battery device according to Modification 5 of the present invention in another capacity mode. [Figure 16] FIG. 13 is a block diagram showing a schematic configuration of a storage battery device according to a sixth modified example of the present invention. [Figure 17] FIG. 13 is a diagram illustrating inter-unit connections in a storage battery equipment according to a sixth modified example of the present invention. [Figure 18] FIG. 13 is a diagram illustrating a configuration example of a storage battery device according to a sixth modification of the present invention in another capacity mode. [Figure 19] FIG. 13 is a diagram illustrating inter-unit connections in a storage battery equipment according to a seventh modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] [Application example] Hereinafter, application examples of the present invention will be described with reference to the drawings. 1 is a block diagram showing a schematic configuration of a distributed power system 200 according to an application example of the present invention. The distributed power system 200 according to this application example is a hybrid power system including a power generation system 150 equipped with a photovoltaic power generation module 70 and the like, and a storage battery system 100 connected to a power grid 90 supplied with commercial power. The storage battery system 100 includes a storage battery device 40 incorporating a storage battery module 41, and a power conditioner 50 (hereinafter also referred to as "PCS 50"), constituting a separated storage battery system in which the storage battery device 40 and the power conditioner 50 are separated. The power generation system 150 includes a power conditioner 60 (hereinafter also referred to as "PCS 60") and a photovoltaic power generation module 70, and the power conditioner 60 includes a unidirectional DC / DC converter 61 that converts DC power generated by the photovoltaic power generation module 70 to a predetermined voltage. 1, the PCS 60 constituting the power generation system 150 and the PCS 50 of the battery system 100 are configured as separate housings, but the PCS 50 of the battery system 100 may be configured to be housed in the same housing as the PCS 60 constituting the power generation system 150. Also, the PCS 50 of the battery system 100 may house the unidirectional DC / DC converter 61 constituting the power generation system 150 in the same housing so as to have the same control function as the PCS 60. An appropriate configuration can be adopted depending on the configuration, scale, etc. of the distributed power source at the consumer.

[0028] As shown in Figure 2, in a separate-type battery system 100, after the battery system is constructed, it is possible to replace the battery equipment 40 depending on the power situation, the configuration and scale of the distributed power source, etc. For example, after constructing the battery system 100 using a battery equipment 40#1 with a storage capacity of 5 kWh, it is possible to replace the battery equipment 40#1 with a battery equipment 40#2 or a battery equipment 40#3 depending on an increase in load, etc. In the separate-type battery system 100, the wiring between the battery equipment 40 and the PCS 50 is connected one-to-one, so there is an extremely low possibility of incorrect wiring occurring when installing the wiring between the battery equipment 40 and the PCS 50 after replacement.

[0029] However, as mentioned above, manufacturers, distributors, and other businesses that provide storage battery devices to consumers are required to prepare multiple types of storage battery devices 40#1 to 40#3 with different storage capacities (kWh) in order to respond to the consumers' power needs, etc. As a result, businesses that provide storage battery devices end up holding inventory of storage battery devices manufactured for each capacity, and managing this product inventory has become an issue.

[0030] As shown in FIG. 3(1), a storage battery device 40a may be configured with a single-capacity storage battery module 41a and connected in parallel to a PCS 50a that constitutes a storage battery system 100. However, in this configuration, power converters 54a to 54c dedicated to the storage battery device 40a must be provided within the PCS 50a to compensate for power loss due to the wiring connecting the PCS 50a and the multiple storage battery devices 40a and for variations in the capacity of each storage battery module. Because the number of power converters 54 is determined by the number of connected storage battery devices 40a, the cost of the PCS increases in proportion to the number of connected storage battery devices 40a. Furthermore, this may result in issues such as having to maintain a new inventory of power conditioners 50a corresponding to the number of storage battery devices 40a. Furthermore, there is a risk of incorrect wiring occurring when constructing the storage battery system 100 and connecting the multiple storage battery devices 40a to the PCS 50a.

[0031] As shown in FIG. 3(2), a configuration is also conceivable in which the storage battery device 40b is configured with a storage battery module 41b of a single capacity and connected in parallel to the bidirectional DC / DC converter 51 of the PCS 50 that constitutes the storage battery system 100. However, in such a configuration, the storage battery device 40b will be equipped with a power conversion unit 42b, which will increase costs. In addition, the provision of the power conversion unit 42b will inevitably increase the relative size of the housing of the storage battery device 40b, and although the number of capacity types will be reduced, a relatively large storage space will be required. This increases the packaging weight for inventory management. Furthermore, when constructing the storage battery system 100 that uses the storage battery devices 40b, there is a risk of incorrect wiring occurring in the wiring that connects the multiple storage battery devices 40b and the bidirectional DC / DC converters 51.

[0032] As shown in FIGS. 4 to 6, the storage battery equipment 10 according to this application example is basically configured with a battery protection unit (BPU) 11, a storage battery unit (BMA) 12, and a fixture 13, and can be configured in accordance with the power situation of the consumer, the configuration and scale of the distributed power source, etc. This results in a storage battery device that allows for variable power storage capacity. Storage battery unit 12 includes a pair of storage battery modules 12b1 and 12b2, each having a capacity of 2.5 kWh, formed by dividing a 5 kWh storage battery module 41 into two, for example. Terminal T2, which is a male connection terminal, is connected to the positive electrode side of storage battery module 12b1, and terminal T1, which is a female connection terminal, is connected to the negative electrode side. The same is true for storage battery module 12b2, and each terminal T1 and T2 is arranged, for example, on the connector arrangement surface of each storage battery unit so as to satisfy predetermined spacing conditions (separation distances "X", "Y", "Z", and "L"). Then, the storage battery units 12 are connected to each other or the terminals T1-T2 within the storage battery units 12 using a dedicated DC connection cable 14 that is pre-defined to a predetermined fixed length so that at least the terminals T1-T2 located at separation distances "X", "Y", and "Z" are connectable to each other, but the terminals T1-T2 located at separation distance "L" are not connectable to each other.

[0033] According to the storage battery equipment 10 of this application example, at least one type of BPU 11, one type of storage battery unit 12, one type of stand (fixture) 13, one type of DC connection cable 14, By simply having one type of I / F connection cable 15 in stock, it is possible to provide a storage battery device 10 with multiple types of power storage capacities according to the number of storage battery units 12. Furthermore, since a pair of storage battery modules built into a storage battery unit 12 can be connected in series or in series with a storage battery module of another storage battery unit 12, the storage battery device 10 and the power conditioner (PCS) 50 can be connected with one-to-one connection wiring, preventing incorrect wiring. Furthermore, since the DC connection cable 14 enables predetermined connections between storage battery units 12 and predetermined connections within a storage battery unit 12, incorrect connections can be prevented when expanding capacity.

[0034] Example 1 Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0035] <System configuration> FIG. 1 is a block diagram showing a schematic configuration of a distributed power system 200 according to an embodiment of the present invention. The distributed power system 200 according to this embodiment is a hybrid power system including a power generation system 150 equipped with a photovoltaic power generation module 70 and the like, and a storage battery system 100 connected to a power grid 90 supplied with commercial power. The storage battery system 100 includes a storage battery device 40 incorporating a storage battery module 41, and a power conditioner 50 (hereinafter also referred to as "PCS 50"). The storage battery device 40 and the power conditioner 50 constitute a separate storage battery system. The power generation system 150 includes a power conditioner 60 (hereinafter also referred to as "PCS 60") and a photovoltaic power generation module 70. The power conditioner 60 includes a unidirectional DC / DC converter 61 that converts DC power generated by the photovoltaic power generation module 70 to a predetermined voltage. Note that the power generation system 150 may be a power generation system other than a photovoltaic power generation system. Other types of power generation systems include power generation systems that use natural energy such as wind power and hydraulic power, and private power generation systems that use fuel.

[0036] The PCS 50 of the storage battery system 100 according to this embodiment includes a bidirectional DC / DC converter 51 and a bidirectional inverter INV 52, which are connected to each other via a DC bus 53. The INV 52 converts, for example, commercial AC power supplied from the power grid 90 into a predetermined DC power. The PCS 50 converts the DC power supplied to the DC bus 53 into AC power and outputs it to a load 80 installed in the power grid 90 or the customer's facility. In the PCS 50, the bidirectional DC / DC converter 51 is connected to the storage battery module 41 of the storage battery equipment 40, and the INV 52 is connected to the power grid 90 or the load 80 installed in the customer's facility via wiring equipment including a distribution board in the customer's facility. The bidirectional DC / DC converter 51 and the INV 52 are also connected to a unidirectional DC / DC converter 61 of the PCS 60 that constitutes the power generation system 150 via the DC bus 53. The unidirectional DC / DC converter 61 of the PCS 60 is connected to the photovoltaic power generation module 70. The hatched arrows in FIG. 1 indicate the flow of power.

[0037] 1 , the bidirectional DC / DC converter 51 performs voltage conversion of the DC power supplied to the DC bus 53 via the INV 52 and the unidirectional DC / DC converter 61 based on a control command from the PCS 50, and charges the storage battery modules 41 of the storage battery equipment 40. Similarly, the bidirectional DC / DC converter 51 performs voltage conversion of the discharge power discharged from the storage battery modules 41 of the storage battery equipment 40, and outputs the voltage to the DC bus 53.

[0038] Furthermore, the unidirectional DC / DC converter 61 of the power generation system 150 performs voltage conversion of the DC power generated by the solar power generation module 70 based on a control command from the PCS 60, and outputs the converted power to the DC bus 53. The PCS 60 of the power generation system 150 performs maximum power point tracking (MPPT) so that the unidirectional DC / DC converter 61 operates at the maximum power (value of current x voltage) point where the power generation output of the solar power generation module 70 is maximized or at the optimum operating point.

[0039] 1, the PCS 60 constituting the power generation system 150 and the PCS 50 of the battery system 100 are configured as separate housings, but the PCS 50 of the battery system 100 may be configured to be housed in the same housing as the PCS 60 constituting the power generation system 150. Also, the PCS 50 of the battery system 100 may house the unidirectional DC / DC converter 61 constituting the power generation system 150 in the same housing so as to have the same control function as the PCS 60. An appropriate configuration can be adopted depending on the configuration, scale, etc. of the distributed power source at the consumer.

[0040] FIG. 2 is a diagram illustrating the configuration of a separate-type storage battery system. In FIG. 2, storage battery devices 40#1 to 40#3 represent storage battery devices with different storage capacities (kWh), and each storage battery device includes (contains) storage battery modules 41#1 to 41#3 with different storage capacities. For example, storage battery device 40#1 has a storage capacity of 5 kWh, and storage battery devices 40#2 and 40#3 have storage capacities of 10 kWh and 15 kWh, respectively. In a separate-type storage battery system 100, any one of storage battery devices 40#1 to 40#3 is installed depending on the power requirements of the consumer and the configuration and scale of the distributed power source.

[0041] As shown in Figure 2, in a separate-type battery system 100, after the battery system is constructed, it is possible to replace the battery equipment 40 depending on the power situation, the configuration and scale of the distributed power source, etc. For example, after constructing the battery system 100 using a battery equipment 40#1 with a storage capacity of 5 kWh, it is possible to replace the battery equipment 40#1 with a battery equipment 40#2 or a battery equipment 40#3 depending on an increase in load, etc. In the separate-type battery system 100, the wiring between the battery equipment 40 and the PCS 50 is connected one-to-one, so there is an extremely low possibility of incorrect wiring occurring when installing the wiring between the battery equipment 40 and the PCS 50 after replacement.

[0042] However, as mentioned above, manufacturers, distributors, and other businesses that provide storage battery devices to consumers are required to prepare multiple types of storage battery devices 40#1 to 40#3 with different storage capacities (kWh) in order to respond to the consumers' power needs, etc. As a result, businesses that provide storage battery devices end up holding inventory of storage battery devices manufactured for each capacity, and managing this product inventory has become an issue.

[0043] FIG. 3 illustrates another configuration of a separate-type storage battery system. FIGS. 3(1) and 3(2) illustrate examples of storage battery equipment 40 configurations that allow for a reduction in the capacity type of the storage battery equipment 40. FIG. 3(1) shows an example of a configuration in which the storage battery equipment 40a is configured with storage battery modules 41a of a single capacity and can be connected in parallel to the PCS 50a that constitutes the storage battery system 100. By configuring the storage battery equipment 40a with storage battery modules 41a of a single capacity (e.g., 5 kWh), the number of storage battery equipment 40a connected in parallel to the PCS 50a can be increased or decreased, thereby providing the storage battery system 100 with the power capacity desired by the consumer. For example, by adding two or three storage battery equipment 40a, a storage capacity of 10 kWh or 15 kWh can be provided. By managing inventory only for storage battery equipment 40a of a single capacity, the business operator can build a storage battery system with a storage capacity that suits the consumer's power situation, etc.

[0044] However, as shown in FIG. 3(1), to compensate for power loss due to the wiring connecting the PCS 50a and the multiple storage battery devices 40a and for variations in the capacity of each storage battery module, it is necessary to provide power conversion units 54a to 54c dedicated to the storage battery devices 40a within the PCS 50a. The power conversion units 54a to 54c are, for example, bidirectional DC / DC converters with a different conversion capacity than the bidirectional DC / DC converter 51. In the storage battery system 100 shown in FIG. 3(1), the number of power conversion units 54 is determined based on the number of connected storage battery devices 40a. This results in an increase in the cost of the PCS 20a in proportion to the number of connected storage battery devices 40a. Furthermore, this creates issues such as having to maintain a new inventory of power conditioners 20a corresponding to the number of storage battery devices 40a. Furthermore, there is a risk of incorrect wiring occurring when constructing the storage battery system 100.

[0045] 3(2) shows an example of a configuration in which a storage battery device 40b is configured with storage battery modules 41b of a single capacity and connected in parallel to a bidirectional DC / DC converter 51 of a PCS 50 that constitutes a storage battery system 100. Each storage battery device 40b is provided with a power conversion unit 42b for compensating for variations in capacity of each storage battery module. The power conversion unit 42b is configured, for example, with a bidirectional DC / DC converter having a different conversion capacity from the bidirectional DC / DC converter 51.

[0046] Even in the configuration shown in FIG. 3(2), the storage battery device 40b can be configured with a storage battery module 41b with a single capacity (e.g., 5 kWh) and a power conversion unit 42b. Therefore, by increasing or decreasing the number of storage battery devices 40b that can be connected in parallel, it is possible to provide a storage battery system 100 with the power capacity desired by the consumer. For example, by adding two or three storage battery devices 40b, a storage capacity of 10 kWh or 15 kWh can be provided. By managing inventory only for storage battery devices 40b with the single capacity, the business operator can build a storage battery system with a storage capacity that suits the consumer's power situation, etc. Furthermore, because the storage battery device 40b is provided with a power conversion unit 42b to compensate for power loss due to the connection wiring, there is no need to newly inventory different types of power conditioners 20 according to the number of storage battery devices 40b, as in the configuration shown in FIG. 3(1).

[0047] However, since the storage battery device 40b includes the power conversion unit 42b, the cost is relatively higher than that of the storage battery device 40a shown in FIG. The provision of the storage battery equipment 40b 42b inevitably increases the housing size of the storage battery equipment 40b. Although the capacity types of the storage battery equipment are reduced, a relatively larger storage space is required compared to the storage battery equipment 40a shown in FIG. 3(1), and the packaging weight for inventory management also increases. Furthermore, when constructing the storage battery system 100 using the storage battery equipment 40b, there is a risk of incorrect wiring occurring in the wiring connecting the multiple storage battery equipment 40b and the PCS 50.

[0048] <Storage battery device configuration> FIG. 4 is a block diagram showing a schematic configuration of a storage battery equipment 10 according to this embodiment. The storage battery equipment 10 according to this embodiment is a storage battery equipment that can vary the storage capacity according to the power situation of the customer, the configuration and scale of the distributed power source, etc. As shown in FIG. 4, the storage battery equipment 10 according to this embodiment is configured to include a battery protection unit (hereinafter also referred to as BPU) 11, a battery module assembly (BMA; 12#1, 12#2), and a frame (Fixture) 13 for fixing the storage battery equipment 10 to the customer's facility. The BPU 11 and the battery The battery module assemblies 12#1 and 12#2 are configured to be housed in their own individual housings. Hereinafter, the battery module assemblies are also referred to as storage battery units, and the battery module assemblies (12#1 and 12#2) are also collectively referred to as storage battery units 12.

[0049] In the storage battery equipment 10 according to this embodiment, the storage battery unit 12 includes two storage battery modules (12b1, 12b2) and a monitoring unit (MBMS) 12a that monitors the state of the storage batteries (e.g., SOC) related to charging and discharging of the storage battery units. The storage battery unit 12 is formed, for example, by dividing the storage battery module 41 shown in FIG. 1 into two storage battery modules, and the two divided storage battery modules constitute the storage battery unit 12 with a single capacity. For example, the 5 kWh storage battery module 41 is divided into two to form a pair of storage battery modules (12b1, 12b2) with a capacity of 2.5 kWh, and the 2.5 kWh storage battery modules (12b1, 12b2) are housed in the same housing, thereby constituting the storage battery unit 12 with a storage capacity of 5 kWh. In the storage battery equipment 10 according to this embodiment, the capacity of each storage battery unit 12 is set as a base capacity, and multiple storage battery units 12 are connected in series according to the power situation of the consumer, thereby making it possible to provide a storage battery system with the storage capacity desired by the consumer. The configuration illustrated in Fig. 4 is an example of a storage battery equipment 10 having a storage capacity of 10 kWh, configured by connecting two storage battery units 12, each with a base capacity of 5 kWh, in series. Hereinafter, the storage battery modules (12b1, 12b2) will also be collectively referred to as storage battery module 12b.

[0050] A male connection terminal, terminal T2, is connected to the positive electrode side of storage battery module 12b constituting storage battery unit 12, and a female connection terminal, terminal T1, is connected to the negative electrode side. Terminals T1 and T2 connected to storage battery module 12b1 and terminals T1 and T2 connected to storage battery module 12b2 are disposed, for example, on the same surface of a housing that houses storage battery unit 12. For example, if the housing that houses storage battery unit 12 is configured as a rectangular hexahedron, terminals T1 and T2 connected to storage battery module 12b1 and terminals T1 and T2 connected to storage battery module 12b2 are disposed on one surface that constitutes the hexahedron. Hereinafter, the housing surface on which terminals T1 and T2 connected to each storage battery module are disposed is also referred to as a connector placement surface. In this embodiment, storage battery module 12b1 corresponds to an example of a “first storage battery module,” and storage battery module 12b2 corresponds to an example of a “second storage battery module.” Furthermore, the terminals T1 and T2 connected to the positive and negative electrodes of the storage battery module 12b1 correspond to an example of "a first terminal connected to one of the positive and negative sides of the first storage battery module, and a second terminal connected to the other of the positive and negative sides of the first storage battery module," and the terminals T1 and T2 connected to the positive and negative electrodes of the storage battery module 12b2 correspond to an example of "a third terminal connected to one of the positive and negative sides of the second storage battery module, and a second terminal connected to the other of the positive and negative sides of the first storage battery module." This corresponds to an example of a "fourth terminal connected to the other side."

[0051] FIG. 5 illustrates the relative arrangement of terminals T1 and T2 provided on the same housing surface of the battery unit 12. In FIG. 5, the connector arrangement surface of battery unit 12#1 and the connector arrangement surface of battery unit 12#2 are illustrated aligned vertically, with the connector arrangement surface of battery unit 12#1 positioned on the upper side. In battery unit 12#1, terminal T2 connected to the positive electrode of battery module 12b1 and terminal T1 connected to the negative electrode of battery module 12b2 are aligned horizontally above the connector arrangement surface. Terminal T1 connected to the negative electrode of battery module 12b1 and terminal T2 connected to the positive electrode of battery module 12b2 are aligned horizontally below the connector arrangement surface. The positions of terminals T1 and T2 connected to each battery module 12b are the same on the connector arrangement surface of battery unit 12#2. A connector terminal T6 for connecting the monitoring unit (MBMS) 12a is provided on the connector arrangement surface of each storage battery unit 12. In this embodiment, the upper side of the connector arrangement surface corresponds to an example of "one end side of the housing surface," and the lower side of the connector arrangement surface corresponds to an example of "the other end side of the housing surface."

[0052] On the connector arrangement surface of the battery unit 12#1, the terminals T2 and T1, which are arranged side by side in the left-right direction on the upper side, are spaced apart by a distance of "L," and the terminals T1 and T2, which are arranged side by side in the left-right direction on the lower side, are spaced apart by a distance of "Y." This arrangement is similar to that on the connector arrangement surface of the battery unit 12#1. Furthermore, between the connector arrangement surfaces of the battery units 12#1 and 12#2, which are arranged side by side in the vertical direction, the distance between the terminal T1 located below the connector arrangement surface of the battery unit 12#1 and the terminal T2 located above the connector arrangement surface of the battery unit 12#2 is "X." Similarly, the distance between the terminal T2 located below the connector arrangement surface of the battery unit 12#1 and the terminal T1 located above the connector arrangement surface of the battery unit 12#2 is "Z." Here, the separation distance represents, for example, the distance between the approximate centers of the areas where the terminals T1 and T2 are provided on the connector arrangement surface. In this embodiment, the separation distance between the terminals T1 and T2 arranged side by side in the left-right direction on the upper side of the connector arrangement surface corresponds to an example of the "first distance," and the separation distance between the terminals T1 and T2 arranged side by side in the left-right direction on the lower side corresponds to an example of the "second distance."

[0053] In the storage battery equipment 10 according to this embodiment, the storage battery units 12#1 and 12#2 are configured so that the storage battery modules 12b are connected in series using a dedicated DC connection cable 14. One end of the DC connection cable 14 is provided with a connector that can be fitted to terminal T1 (e.g., a male connector corresponding to terminal T2), and the other end is provided with a connector that can be fitted to terminal T2 (e.g., a female connector corresponding to terminal T1). The DC connection cable 14 is configured to have a predetermined fixed length. In this embodiment, the DC connection cable 14 is an example of a connection cable having at one end a first fitting terminal that fits to the first terminal and at the other end a second fitting terminal that fits to the second terminal, the first fitting terminal being capable of fitting to the third terminal and the second fitting terminal being capable of fitting to the fourth terminal.

[0054] For example, terminal T1 arranged on the lower side of the connector arrangement surface of storage battery unit 12#1 is connected to terminal T2 arranged on the upper side of the connector arrangement surface of storage battery unit 12#2 using DC connection cable 14. This connects the negative electrode side of storage battery module 12b1 of storage battery unit 12#1 to the positive electrode side of storage battery module 12b1 of storage battery unit 12#2 in series. Similarly, terminal T2 arranged on the lower side of the connector arrangement surface of storage battery unit 12#1 is connected to terminal T2 arranged on the upper side of the connector arrangement surface of storage battery unit 12#2 using DC connection cable 14. The terminals T1 and T2 are connected to terminal T1 arranged on the upper side of the connector arrangement surface of each battery unit. This connects the positive electrode side of storage battery module 12b2 of storage battery unit 12#1 in series with the negative electrode side of storage battery module 12b2 of storage battery unit 12#2. Furthermore, terminals T1 and T2 arranged on the lower side of the connector arrangement surface of each battery unit are connected using a dedicated DC connection cable 14. This connects the negative electrode side of storage battery module 12b1 built into each battery unit in series with the negative electrode side of storage battery module 12b2.

[0055] However, the terminal T2 and terminal T1 located on the upper side of the connector arrangement surface of each battery unit cannot be connected using the dedicated DC connection cable 14. In other words, the distances "X," "Y," and "Z" are the inter-terminal distances that can be connected using the dedicated DC connection cable 14, which is predefined to a predetermined fixed length, and the distance "L" can also be described as the inter-terminal distance that cannot be connected using the DC connection cable 14. Note that two types of connectors with different mating types are provided at both ends of the dedicated DC connection cable 14. Therefore, for example, the terminal T1 located on the lower side of the connector arrangement surface of the battery unit 12#1 and the terminal T1 located on the upper side of the connector arrangement surface of the battery unit 12#2 cannot be connected via the DC connection cable 14. Similarly, the terminal T2 located on the lower side of the connector arrangement surface of the battery unit 12#1 and the terminal T2 located on the upper side of the connector arrangement surface of the battery unit 12#2 cannot be connected via the DC connection cable 14. Furthermore, the terminal T1 arranged on the upper side of the connector arrangement surface of each battery unit and the terminal T1 arranged on the lower side, and the terminal T2 arranged on the upper side and the terminal T2 arranged on the lower side are not connected via the DC connection cable 14. It goes without saying that the positive electrode side (terminal T2) and the negative electrode side (terminal T1) of the battery module 12b1 and the positive electrode side (terminal T2) and the negative electrode side (terminal T1) of the battery module 12b2 within the same battery unit cannot be connected by a dedicated DC connection cable 14.

[0056] In the storage battery apparatus 10 according to this embodiment, the positions of the terminals T1 and T2 arranged on the connector arrangement surface of the storage battery unit 12 are configured to satisfy the separation distances “X,” “Y,” “Z,” and “L.” Furthermore, by using a dedicated DC connection cable 14 with a predetermined fixed length, it is possible to prevent incorrect wiring of the storage battery unit 12 that occurs during capacity expansion. Furthermore, by using the dedicated DC connection cable 14, it is possible to connect the storage battery module 12b1 of one storage battery unit 12 in series with the storage battery module 12b1 of another storage battery unit 12, and the storage battery module 12b2 of one storage battery unit 12 in series with the storage battery module 12b2 of another storage battery unit 12. Similarly, it is possible to connect the storage battery module 12b1 and the storage battery module 12b2 built into the storage battery unit 12 in series. According to the storage battery apparatus 10 according to this embodiment, it is possible to provide a storage battery apparatus with variable capacity by connecting the storage battery modules 12b1 and 12b2 built into the storage battery unit 12 in series.

[0057] Returning to FIG. 4, the monitoring unit (MBMS) 12a constituting the storage battery unit 12 is a microcomputer unit including a processor (e.g., MPU), memory, a communication interface circuit, etc. The monitoring unit 12a monitors the charging and discharging states of the two storage battery modules 12b1 and 12b2 included in the storage battery unit 12 and adjusts the voltage variations of the storage battery cells constituting each of the storage battery modules 12b1 and 12b2. Examples of such a microcomputer unit include a unit having multiple functional ICs mounted on a substrate, and a dedicated IC for a System on a Chip (SoC) that integrates functions such as the processor (e.g., MPU), memory, and communication interface circuit on a single chip. The memory may include flash memory, RAM, and ROM. The monitoring unit 12a is connected to the communication terminal T6 and is connected to the control unit (RBMS) 11a of the BPU 11 and the monitoring units 12a constituting other storage battery units 12 via an I / F connection cable 15 having a connector terminal that fits into the communication terminal T6. The monitoring unit 12a monitors, for example, the state of the storage battery module 12b that it monitors, The monitoring unit (MBMS) 12a monitors, for example, the voltages of the storage battery cells constituting the storage battery modules 12b1 and 12b2, the module temperatures, and the like as status information related to charging and discharging, and notifies the control unit 11a of the BPU 11 of the status information.

[0058] The BPU 11 is a unit that has a function of protecting the storage battery modules 12b1, 12b2, etc. built into the storage battery unit 12 constituting the storage battery equipment 10 by controlling the interruption of charging current, discharging current, etc., when overcharging, over-discharging, temperature abnormality, etc. is detected in the storage battery unit 12. The BPU 11 has a connection interface for connecting to a power conditioner (PCS) 50 when constructing the storage battery system 100. Specifically, the BPU 11 has a DC+ side terminal T3 and a DC- side terminal T4 to which connection wiring for connecting to a bidirectional DC / DC converter 51 of the PCS 50 is connected. The BPU 11 also has an I / F terminal T5 for notifying the PCS 50 of a detected abnormality. The PCS 50 and the BPU 11 are connected via communication, for example, a CAN.

[0059] Furthermore, the BPU 11 has a connection interface for connection to the storage battery unit 12. Specifically, the BPU 11 has a terminal T1 for connection to a terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12, and a terminal T2 for connection to a terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12. The BPU 11 also has a communication terminal T6 for acquiring status information of the storage battery module 12b via the monitoring unit 12a of the storage battery unit 12. The terminal T1 of the BPU 11 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12, and the terminal T2 of the BPU 11 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12, are connected using a dedicated DC connection cable 14. The communication terminal T6 of the BPU 11 and the communication terminal T6 connected to the monitoring unit 12a of the storage battery unit 12 are connected via an I / F connection cable 15.

[0060] The BPU 11 includes a control unit (RBMS) 11a, a power supply 11b, a relay Ry, a circuit breaker CB, and a fuse F. The power supply 11b is an internal power supply for driving the control unit 11a. The power supply 11b generates drive power from the stored power of the storage battery units 12 connected via terminals T1 and T2, for example, and supplies the drive power to the control unit 11a. The control unit 11a is a microcomputer unit such as an SoC (System on a Chip) that controls the operation of the entire storage battery equipment 10 based on status information notified from each storage battery unit 12 that constitutes the storage battery equipment 10. The control unit 11a includes a processor (such as an MPU), memory, a communication interface circuit, etc. The memory includes flash memory, RAM, ROM, etc.

[0061] The control unit 11a functions to cut off charging and discharging currents when overcharging, overdischarging, temperature abnormalities, etc. are detected in the storage battery unit 12, thereby protecting each storage battery module built into the storage battery unit. The control unit 11a also functions to notify the PCS 50 constituting the storage battery system 100 of any abnormalities detected in the storage battery equipment 10. The control unit 11a calculates the SOC (State of Charge) and SOH (State of Health) of the storage battery equipment 10 based on, for example, status information notified from the monitoring unit (MBMS) 12a of each storage battery unit, the amount of input and output power via the DC+ side terminal T3 and the DC- side terminal T4, etc. The control unit 11a also manages information related to maintenance and warranty, such as the number of charge and discharge cycles of the storage battery equipment 10. The control unit 11a notifies the PCS 50 of the connected storage battery system 100 via the I / F terminal T5.

[0062] The relay Ry, circuit breaker CB, and fuse F constitute a protection circuit for protecting the storage battery module 12b and the like when overcharging, overdischarging, temperature abnormality, etc. are detected. One end of the relay Ry is connected to the DC+ side terminal T3, and the other end is connected to one end of the circuit breaker CB. The other end of the circuit breaker CB is connected to a terminal T1 for connection with a terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12. One end of the fuse F is connected to the DC-side terminal T4, and the other end is connected to one end of the circuit breaker CB. The other end of the circuit breaker CB, one end of which is connected to the fuse F, is connected to a terminal T2 for connection with a terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12.

[0063] In the protection circuit, for example, based on control by the control unit 11a, the cutoff control of charging current, discharging current, etc. is performed by opening the contacts of the relay Ry and cutting off the circuit breaker CB. Also, an overcurrent flowing through each storage battery unit is cut off by melting the fuse F. The circuit breaker CB may be turned on / off manually or turned off when an overcurrent is detected.

[0064] 4, terminal T2 of BPU 11 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12#1, and terminal T1 of BPU 11 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12#1 via DC connection cable 14. Terminal T2 connected to the positive electrode side of storage battery module 12b2 of storage battery unit 12#1 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12#2, and terminal T1 connected to the negative electrode side of storage battery module 12b1 of storage battery unit 12#1 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12#2 via DC connection cable 14. In storage battery unit 12#2, terminal T2 connected to the positive electrode side of storage battery module 12b2 and terminal T1 connected to the negative electrode side of battery module 12b1 are connected via DC connection cable 14. Note that monitoring unit 12a of storage battery unit 12#1 and monitoring unit 12a of storage battery unit 12#2 are connected using I / F connection cable 15.

[0065] As a result, battery module 12b2 of battery unit 12#1, battery module 12b2 of battery unit 12#2, battery module 12b1 of battery unit 12#2, and battery module 12b1 of battery unit 12#1 are connected in series to provide a battery device 10 with a storage capacity of 10 kWh. Since the battery device 10 is connected to the bidirectional DC / DC converter 51 of the PCS 50 by one-to-one connection wiring, incorrect wiring during wiring installation can be reduced.

[0066] 6A and 6B are diagrams illustrating an example of the configuration of the storage battery equipment 10 according to the present embodiment in another capacity configuration. FIG. 6A illustrates the configuration of the storage battery equipment 10 including one BPU 11, three storage battery units (12#1, 12#2, 12#3), and a fixture 13. 6(2) illustrates an example of a storage battery equipment 10 including one BPU 11, one storage battery unit 12, and a fixture 13. In the example shown in FIG. 6(1), a storage capacity of 5 kWh can be provided by connecting three storage battery units 12 in series, each with a basic capacity of 5 kWh. In the example shown in FIG. 6(1), a storage capacity of 5 kWh can be provided by one storage battery unit 12.

[0067] In the configuration shown in Figure 6(1), the terminal T2 of the BPU 11 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#1, and the terminal T1 of the BPU 11 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#1 are connected via the DC connection cable 14. In addition, the terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12#1 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#2, and the terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#1 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#2 are connected via the DC connection cable 14. and terminal T2 connected to the positive electrode side of storage battery module 12b2 of storage battery unit 12#2 are connected via DC connection cable 14. Furthermore, terminal T2 connected to the positive electrode side of storage battery module 12b2 of storage battery unit 12#2 and terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12#3, and terminal T1 connected to the negative electrode side of storage battery module 12b1 of storage battery unit 12#2 and terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12#3 are connected via DC connection cable 14. In storage battery unit 12#3, terminal T2 connected to the positive electrode side of storage battery module 12b2 and terminal T1 connected to the negative electrode side of battery module 12b1 are connected via DC connection cable 14. The monitoring unit 12a of the storage battery unit 12#1 and the monitoring unit 12a of the storage battery unit 12#2, and the monitoring unit 12a of the storage battery unit 12#2 and the monitoring unit 12a of the storage battery unit 12#3 are connected using an I / F connection cable 15.

[0068] As a result, battery module 12b2 of battery unit 12#1, battery module 12b2 of battery unit 12#2, battery module 12b2 of battery unit 12#3, battery module 12b1 of battery unit 12#3, battery module 12b1 of battery unit 12#2, and battery module 12b1 of battery unit 12#1 are connected in series to provide a battery device 10 with a storage capacity of 15 kWh. Even in this configuration, battery device 10 is connected to bidirectional DC / DC converter 51 of PCS 50 by one-to-one connection wiring, thereby reducing the risk of incorrect wiring during wiring installation.

[0069] In the configuration shown in FIG. 6(2), terminal T2 of BPU 11 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12, and terminal T1 of BPU 11 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12, via DC connection cable 14. In storage battery unit 12, terminal T2 connected to the positive electrode side of storage battery module 12b2 is connected to terminal T1 connected to the negative electrode side of battery module 12b1, via DC connection cable 14. Control unit 11a of BPU 11 and monitoring unit 12a of storage battery unit 12 are connected via I / F connection cable 15. In the configuration shown in FIG. 6(2), storage battery module 12b2 and storage battery module 12b1 of storage battery unit 12 are connected in series to provide a storage battery apparatus 10 having a storage capacity of 5 kWh. The storage battery equipment 10 is connected to the bidirectional DC / DC converter 51 of the PCS 50 via a one-to-one connection wiring.

[0070] As explained above, the storage battery equipment 10 according to this embodiment can provide a storage battery equipment that has at least a BPU 11 and storage battery units 12 as basic components and that can vary the storage capacity to 5 kWh, 10 kWh, 15 kWh, etc., depending on the power situation of the consumer and the configuration and scale of the distributed power source. The storage battery equipment 10 does not need to be equipped with a power conversion unit such as a bidirectional DC / DC converter, and the power conditioner (PCS) 50 connected to the storage battery equipment 10 does not need to be equipped with a power conversion unit such as a bidirectional DC / DC converter, so there is no increase in the cost of the storage battery system 100. Furthermore, businesses and the like can easily use, for example, one type of BPU 11, one type of storage battery unit 12, one type of fixture 13, and one By simply having different types of DC connection cables 14 in stock, it is possible to provide a storage battery device 10 having different types of power storage capacities according to the number of storage battery units 12. According to this embodiment, it is possible to provide a storage battery device that is easy to manage inventory, minimizes restrictions on storage of storage battery devices due to size and weight, and can suppress deterioration of storage battery modules due to prolonged storage periods.

[0071] Furthermore, with the storage battery device 10 according to this embodiment, a pair of storage battery modules built into the storage battery unit 12 can be connected in series, or a storage battery module of another storage battery unit 12 can be connected in series, thereby configuring a plurality of types of storage capacities. Therefore, in the storage battery system 100, the storage battery device 10 and the power conditioner (PCS) 50 can be connected with one-to-one connection wiring. For example, the storage capacity can be increased in response to an increase in load, etc. Even in this case, the PCS 50 and the storage battery equipment 10 can be connected with one-to-one connection wiring. According to the storage battery equipment 10 of this embodiment, incorrect wiring that connects the storage battery equipment 10 and the PCS 50 during wiring construction can be suppressed.

[0072] Furthermore, with the storage battery apparatus 10 according to this embodiment, the terminals T1 and T2 connected to a pair of storage battery modules 12b1 and 12b2 can be arranged on the connector arrangement surface of the storage battery unit 12 so as to satisfy the positional relationship of separation distances "X," "Y," "Z," and "L." The terminals T1 and T2 can be connected between storage battery units 12 or within a storage battery unit 12 using a dedicated DC connection cable 14 whose length is predetermined to allow connection between the terminals T1 and T2 arranged at separation distances "X," "Y," and "Z," but not between the terminals T1 and T2 arranged at separation distance "L." The storage battery apparatus 10 according to this embodiment prevents incorrect connection of the storage battery units 12 when expanding the capacity.

[0073] <Variation 1> In the storage battery device 10 according to the embodiment, the terminals T1 and T2 on the connector arrangement surface of the storage battery unit 12 are arranged so as to satisfy the positional relationship of the separation distances "X," "Y," "Z," and "L." In Modification 1, for example, the condition for the separation distance "L" can be relaxed, and the terminals T1 and T2 connected to the pair of storage battery modules 12b1 and 12b2 can be arranged on the connector arrangement surface. However, because the condition for the separation distance "L" is relaxed, there is a risk of misconnection occurring at the location corresponding to this condition. However, for example, the storage battery module 12 can be protected from overcurrent by adding a fuse or the like to the connection path.

[0074] Fig. 7 is a diagram illustrating the connection between the storage battery units in Modification 1. Fig. 7(1) illustrates the relative positional relationship between terminals T1 and T2 on the connector arrangement surface, and Fig. 7(2) illustrates the connection between the storage battery units.

[0075] As shown in FIG. 7(1), on the connector arrangement surface of the storage battery unit 12 according to the first modification, the terminals T1 and T2 are arranged so as to satisfy the same positional relationship of the distances "X," "Y," and "Z" as in the embodiment. However, the condition for the distance "L" between the terminals T2 and T1, which are arranged side by side in the left-right direction on the upper side of the connector arrangement surface, is relaxed. Each of the storage battery units 12#1 and 12#2 is provided with a fuse F1, which is a protection circuit for protecting the storage battery module 12 from overcurrent that may occur in the event of improper connection. As shown in FIG. 7(1), the fuse F1 is provided, for example, between the positive electrode side of the storage battery module 12b1 and the terminal T2. The fuse F1 may be located between the negative electrode side of the storage battery module 12b1 and the terminal T1, between the positive electrode side of the storage battery module 12b2 and the terminal T2, or between the negative electrode side of the storage battery module 12b2 and the terminal T1.

[0076] As shown in FIG. 7(2), in the first modification, the storage battery unit 12#1 and the storage battery unit 12#2 are configured so that the storage battery modules 12b are connected in series using a dedicated DC connection cable 14. For example, the terminal T1 arranged on the lower side of the connector arrangement surface of the storage battery unit 12#1 is connected to the terminal T2 arranged on the upper side of the connector arrangement surface of the storage battery unit 12#2 using the DC connection cable 14. This connects the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#1 to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#2 in series. Similarly, the terminal T2 arranged on the lower side of the connector arrangement surface of the storage battery unit 12#1 is connected to the terminal T1 arranged on the upper side of the connector arrangement surface of the storage battery unit 12#2 using the DC connection cable 14. This connects the positive electrode side of the storage battery module 12b2 of the storage battery unit 12#1 to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#2 in series. Furthermore, the terminals T1 and T2 arranged on the lower side of the connector arrangement surface of each storage battery unit are The storage battery units are connected using a DC connection cable 14. This connects the negative pole side of the storage battery module 12b1 and the negative pole side of the storage battery module 12b2 built into each storage battery unit in series.

[0077] In the event of a misconnection between terminals T1 and T2, which are arranged side by side in the left-right direction on the upper side of the connector arrangement surface of the storage battery unit 12, a fuse F1 provided between the positive electrode side of the storage battery module 12b1 and terminal T2 melts, thereby providing protection from an overcurrent. Although the addition of fuse F1 increases costs and causes power loss, the first modification can also provide a storage battery device 10 that achieves the same effects as the embodiment.

[0078] <Variation 2> The storage battery equipment 10 according to the embodiment is configured to have at least a BPU 11 and a storage battery unit 12 as basic components, and to have variable storage capacity such as 5 kWh, 10 kWh, and 15 kWh. Here, it is also possible to include a pair of storage battery modules 12b1 and 12b2 that constitute the storage battery unit 12 within the BPU 11. In Modification 2, the storage battery equipment is configured in a form in which a pair of storage battery modules 12b1 and 12b2 are included within the BPU 11.

[0079] FIG. 8 is a block diagram showing a schematic configuration of a storage battery apparatus 10a according to Modification 2. As shown in FIG. 8, in the storage battery apparatus 10a according to Modification 2, a BPU 21 is configured including a pair of storage battery modules 12b1 and 12b2. In the configuration of the storage battery apparatus 10a shown in FIG. 8, two storage battery units 12#1 and 12#2, each with a basic capacity of 5 kWh, are connected in series to the BPU 21, thereby providing a storage capacity of 15 kWh. Below, differences from the storage battery apparatus 10 according to the embodiment will be mainly described.

[0080] In BPU21, the positive electrode side of storage battery module 12b1 is connected to one end of circuit breaker CB constituting a protection circuit, and the negative electrode side is connected to terminal T1. Similarly, the negative electrode side of storage battery module 12b2 is connected to the other end of circuit breaker CB, and the positive electrode side is connected to terminal T2. The other configurations of BPU21 are the same as those of BPU11.

[0081] In the storage battery apparatus 10a according to the second modification, the terminal T2 of the BPU 21 is connected to the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#1, and the terminal T1 of the BPU 21 is connected to the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#1, respectively, via a DC connection cable 14. The connection between the storage battery unit 12#1 and the storage battery unit 12#2 is similar to that of the storage battery apparatus 10 according to the embodiment. As a result, the storage battery module 12b2 of the BPU 21, the storage battery module 12b2 of the storage battery unit 12#1, the storage battery module 12b2 of the storage battery unit 12#2, the storage battery module 12b1 of the storage battery unit 12#2, the storage battery module 12b1 of the storage battery unit 12#1, and the storage battery module 12b1 of the BPU 21 are connected in series, providing the storage battery apparatus 10a having a storage capacity of 15 kWh. In the second modified example as well, the storage battery equipment 10a is connected to the bidirectional DC / DC converter 51 of the PCS 50 by one-to-one connection wiring, so that incorrect wiring during wiring installation can be suppressed.

[0082] 9A and 9B are diagrams illustrating an example of the configuration of a storage battery equipment 10a according to Modification 2 in another capacity configuration. FIG. 9A illustrates a configuration of a storage battery equipment 10a including one BPU 21, one storage battery unit 12, and a fixture 13. FIG. 9B illustrates a configuration of a storage battery equipment 10a including one BPU 21, one storage battery unit 12, and a fixture 13. The storage battery device 10a includes a BPU 11 and a fixture 13. In the configuration of FIG. 9(1), a storage capacity of 10 kWh is provided by the series connection of the BPU 21 and the storage battery unit 12, and in the configuration of FIG. 9(2), a storage capacity of 5 kWh is provided by the BPU 21. The storage battery equipment 10a according to the second modification may be configured without including the fixture 13 shown in FIG.

[0083] 9(1), terminal T2 of BPU 21 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12, and terminal T1 of BPU 12 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12, via DC connection cable 14. In storage battery unit 12, terminal T2 connected to the positive electrode side of storage battery module 12b2 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b1, via DC connection cable 14. As a result, storage battery module 12b2 of BPU 21, storage battery module 12b2 of storage battery unit 12, storage battery module 12b1 of storage battery unit 12, and storage battery module 12b1 of BPU 21 are connected in series to provide storage battery apparatus 10a having a storage capacity of 10 kWh.

[0084] 9(2), terminal T2 connected to the positive electrode side of storage battery module 12b2 of BPU 21 and terminal T1 connected to the negative electrode side of storage battery module 12b1 are connected via DC connection cable 14. As a result, storage battery module 12b2 and storage battery module 12b1 built into BPU 21 are connected in series to provide storage battery apparatus 10a having a storage capacity of 5 kWh. Even in other capacity configurations, storage battery apparatus 10a according to modification 2 is connected to bidirectional DC / DC converter 51 of PCS 50 by one-to-one connection wiring, thereby preventing incorrect wiring during wiring installation.

[0085] <Variation 3> In the storage battery apparatus 10a according to the second modification, the capacity of the storage battery module 12 built into the BPU 21 and the storage battery unit 12 can also be set to 5 kWh. In the third modification, the storage battery apparatus is configured in such a manner that a single 5 kWh storage battery module 12b3 is included in the BPU 21 and the storage battery unit 12. In this modification, the storage battery module 12b3 corresponds to an example of a "first storage battery module," and the terminals T1 and T2 connected to the positive and negative electrodes of the storage battery module 12b3 correspond to an example of a "first terminal connected to one of the positive and negative electrodes of the first storage battery module, and a second terminal connected to the other of the positive and negative electrodes of the first storage battery module."

[0086] Fig. 10 is a block diagram showing a schematic configuration of a storage battery apparatus 10b according to Modification 3. As shown in Fig. 10, in the storage battery apparatus 10b according to Modification 3, a BPU 31 and a storage battery unit 22 are configured, each including a single storage battery module 12b3 with a storage capacity of 5 kWh. In the configuration of the storage battery apparatus 10b shown in Fig. 10, two storage battery units 22#1 and 22#2, each with a basic capacity of 5 kWh, are connected in series to the BPU 31, thereby providing a storage capacity of 15 kWh. The following mainly describes the differences from the storage battery apparatus 10a according to Modification 2.

[0087] In BPU31, the positive electrode side of storage battery module 12b3 is connected to one end of circuit breaker CB constituting a protection circuit, and the negative electrode side is connected to terminal T1. The other end of circuit breaker CB is connected to terminal T2 via connection wiring 12b4. In Modification 3, by using a single storage battery module 12b3 having a storage capacity of 5 kWh, it is possible to provide a storage battery system 10b equivalent to the storage battery system 10 of the embodiment and the storage battery system 10a of Modification 2. Note that other configurations of BPU31 are the same as those of BPU11.

[0088] Similarly to BPU 31, battery units 22#1 and 22#2 also incorporate a single battery module 12b3 having a storage capacity of 5 kWh. That is, terminal T2 connected to the positive terminal of battery module 12b3 is disposed on the upper side of the connector arrangement surface, and terminal T3 connected to the positive terminal of battery module 12b3 is disposed on the lower side. A terminal T1 connected to the negative electrode of storage battery module 12b3 is arranged on the upper side of the connector arrangement surface. Furthermore, terminal T1 connected to one end of connection wiring 12b4 is arranged on the upper side of the connector arrangement surface, and terminal T2 connected to the other end of connection wiring 12b4 is arranged on the lower side of the connector arrangement surface.

[0089] In the storage battery equipment 10b according to the third modification, the terminal T2 of the BPU 31 is connected to the terminal T1 connected to the connection wiring 12b4 of the storage battery unit 22#1, and the terminal T1 of the BPU 31 is connected to the terminal T2 connected to the positive electrode side of the storage battery module 12b3 of the storage battery unit 22#1, respectively, via a DC connection cable 14. The terminal T2 connected to the connection wiring 12b4 of the storage battery unit 22#1 is connected to the terminal T1 connected to the connection wiring 12b4 of the storage battery unit 22#2, and the terminal T1 connected to the negative electrode side of the storage battery module 12b3 of the storage battery unit 22#1 is connected to the terminal T2 connected to the positive electrode side of the storage battery module 12b3 of the storage battery unit 22#2, respectively, via a DC connection cable 14. In the storage battery unit 22#2, the terminal T2 connected to the connection wiring 12b4 is connected to the terminal T1 connected to the negative electrode side of the storage battery module 12b3, respectively, via a DC connection cable 14.

[0090] As a result, the storage battery module 12b3 of storage battery unit 22#2, the storage battery module 12b3 of storage battery unit 22#2, and the storage battery module 12b3 of BPU 31 are connected in series to provide a storage battery apparatus 10b having a storage capacity of 15 kWh. Even in the third modification, the storage battery apparatus 10b is basically configured to include at least BPU 31 and storage battery unit 22, and can provide a storage battery apparatus with a variable storage capacity such as 5 kWh, 10 kWh, or 15 kWh. Also in the third modification, the storage battery apparatus 10b is connected to the bidirectional DC / DC converter 51 of the PCS 50 by one-to-one connection wiring, thereby reducing incorrect wiring during wiring installation.

[0091] FIG. 11 is a diagram illustrating a configuration example of a storage battery equipment 10b according to Modification 3 in another capacity form. FIG. 11(1) illustrates a configuration of a storage battery equipment 10b including one BPU 31, one storage battery unit 22, and a stand (Fixture) 13. The storage battery equipment 10b includes one BPU 31 and a fixture 13. 11(1), a storage capacity of 10 kWh is provided by connecting the BPU 31 and the storage battery unit 22 in series, and in the configuration of FIG. 11(2), a storage capacity of 5 kWh is provided by the BPU 31. Note that in Modification 3, the storage battery equipment 10b can also be configured in a configuration that does not include the fixture 13 shown in FIG.

[0092] 11(1), terminal T2 of BPU 31 is connected to terminal T1 of storage battery unit 22, and terminal T2 of BPU 31 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b3 of storage battery unit 22, via DC connection cable 14. In storage battery unit 22, terminal T2 connected to one end of connection wiring 12b4 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b3, via DC connection cable 14. As a result, storage battery module 12b3 of storage battery unit 22 and storage battery module 12b3 of BPU 31 are connected in series, providing storage battery apparatus 10b having a storage capacity of 10 kWh.

[0093] 11(2), the terminal T2 of the BPU 31 and the terminal T1 connected to the negative electrode side of the storage battery module 12b3 are connected via the DC connection cable 14. As a result, a 5 kWh storage battery device 10b is provided that has the storage capacity of the storage battery module 12b3 built into the BPU 31. Even in other capacity configurations, the storage battery device 10b according to the third modification is connected to the bidirectional DC / DC converter 51 of the PCS 50 by one-to-one connection wiring, thereby preventing incorrect wiring during wiring installation.

[0094] As another example of the third modification, the storage battery equipment 10b may be configured by combining the BPU 11 constituting the storage battery equipment 10 according to the embodiment with the storage battery unit 22. 12A and 12B are diagrams illustrating the capacity configuration of a storage battery equipment 10b according to Modification 3, in a configuration example in which a BPU 11 and storage battery units 22 are combined. FIG. 12A shows a configuration in which one BPU 11, three storage battery units 22, and a fixture 13 are included in the configuration, and the capacity configuration is 15 kW. 12(b) shows an example of a storage battery equipment 10b that provides a storage capacity of 1000 kJ / h. Also, FIG. 12(b) shows a configuration of a storage battery equipment 10b that includes one BPU 11, two storage battery units 22, and a fixture 13. FIG. 12(3) shows a configuration including one BPU 11, one storage battery unit 22, and a fixture 13, providing a storage capacity of 5 kWh. FIG. 12 also shows an example of a configuration for providing a quantity of light. The storage battery equipment 10b can be configured in various forms.

[0095] In the configuration shown in Fig. 12(1), three storage battery units 22#1, 22#2, and 22#3, each having a basic capacity of 5 kWh, are connected in series and connected to a BPU 11. In Fig. 12(1), terminal T2 of the BPU 11 is connected to terminal T1 connected to connection wiring 12b4 of storage battery unit 22#1, and terminal T1 of the BPU 11 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b3 of storage battery unit 22#1, respectively, via DC connection cables 14. Terminal T2 connected to connection wiring 12b4 of storage battery unit 22#1 is connected to terminal T1 connected to connection wiring 12b4 of storage battery unit 22#2, and terminal T1 connected to the negative electrode side of storage battery module 12b3 of storage battery unit 22#1 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b3 of storage battery unit 22#2, respectively, via DC connection cables 14. Similarly, terminal T2 connected to connection wiring 12b4 of storage battery unit 22#2 and terminal T1 connected to connection wiring 12b4 of storage battery unit 22#3, and terminal T1 connected to the negative electrode side of storage battery module 12b3 of storage battery unit 22#2 and terminal T2 connected to the positive electrode side of storage battery module 12b3 of storage battery unit 22#3 are each connected via DC connection cable 14. In storage battery unit 22#3, terminal T2 connected to connection wiring 12b4 and terminal T1 connected to the negative electrode side of storage battery module 12b3 are connected via DC connection cable 14.

[0096] As a result, the battery module 12b3 of the battery unit 22#1, the battery module 12b3 of the battery unit 22#2, and the battery module 12b3 of the battery unit 22#1 are connected in series to provide a battery apparatus 10b having a power storage capacity of 15 kWh.

[0097] In the configuration shown in FIG. 12(2), two storage battery units 22#1 and 22#2, each having a basic capacity of 5 kWh, are connected in series and connected to the BPU 11. As in FIG. 12(1), the BPU 11 and storage battery unit 22#1, and the storage battery unit 22#1 and storage battery unit 22#2 are connected via a DC connection cable 14. In storage battery unit 22#2, terminal T2 connected to connection wiring 12b4 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b3 via the DC connection cable 14. As a result, the storage battery module 12b3 of storage battery unit 22#1 and the storage battery module 12b3 of storage battery unit 22#2 are connected in series, providing a storage battery apparatus 10b having a storage capacity of 10 kWh.

[0098] In the configuration shown in FIG. 12(3), similarly to FIG. 12(1), the BPU 11 and the storage battery unit 22 are connected via the DC connection cable 14, and in the storage battery unit 22, the terminal T2 connected to the connection wiring 12b4 and the terminal T1 connected to the negative electrode side of the storage battery module 12b3 are connected via the DC connection cable 14. As a result, the terminal T2 connected to the positive electrode side of the storage battery unit 22 with a basic capacity of 5 kWh and the terminal T1 connected to the negative electrode side are connected to the BPU 11 via the DC connection cable 14, and a storage battery apparatus 10b having a storage capacity of 5 kWh is provided. Even in the configuration shown in FIG. 12, the storage battery apparatus 10b is basically composed of at least the BPU 11 and the storage battery unit 22, and can provide a storage battery apparatus with a variable storage capacity of 5 kWh, 10 kWh, or 15 kWh, and can be used in conjunction with a PCS. Since the bidirectional DC / DC converter 50 can be connected one-to-one with the bidirectional DC / DC converter 51, incorrect wiring during wiring construction can be prevented.

[0099] <Variation 4> FIG. 13 is a block diagram showing the schematic configuration of a storage battery apparatus 10c according to Modification 4. FIG. 13 illustrates an apparatus form with a storage capacity of 20 kWh that can be operated by further connecting two series-connected storage battery units 12 in parallel. The storage battery apparatus 10c according to Modification 4 is configured with a BPU 32 including an expansion circuit for parallel connection, instead of the BPU 11 that configures the storage battery apparatus 10 of the embodiment. The storage battery apparatus 10c according to Modification 4 also provides a storage battery apparatus having a basic configuration of storage battery units 12 and a stand (fixture) 13. The differences from the storage battery equipment 10 in the embodiment will be mainly described.

[0100] The BPU 32 in Variation 4 includes, in its extension circuit, a terminal T1a connected to terminal T1 via internal wiring, a terminal T2a connected to terminal T2 via internal wiring, and a communication terminal T6a connected to communication terminal T6 via internal wiring (communication line). To enhance safety in the parallel connection, a fuse or the like may be provided in the wiring path between terminal T1 and terminal T1a or between terminal T2 and terminal T2a. Terminal T1a, terminal T2a, and communication terminal T6a are each configured with the same components as terminal T1, terminal T2, and communication terminal T6. Other configurations of the BPU 32 are the same as those of the BPU 11.

[0101] In the storage battery equipment 10c according to the fourth modification, the terminal T2 of the BPU 32 is connected to the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#1, and the terminal T1 of the BPU 32 is connected to the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#1, respectively, via a DC connection cable 14. The connection between the storage battery unit 12#1 and the storage battery unit 12#2 is the same as in the storage battery equipment 10 of the embodiment. Furthermore, terminal T2a of BPU 32 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12#3, and terminal T1a of BPU 32 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12#3, respectively, via DC connection cable 14. The connection between storage battery unit 12#3 and storage battery unit 12#4 is similar to the connection between storage battery unit 12#1 and storage battery unit 12#2 in the storage battery equipment 10 of the embodiment.

[0102] As a result, battery module 12b2 of battery unit 12#1, battery module 12b2 of battery unit 12#2, battery module 12b1 of battery unit 12#2, and battery module 12b1 of battery unit 12#1 are connected in series, and a battery having a storage capacity of 10 kWh is connected between terminals T1 and T2 of BPU 32. Also, battery module 12b2 of battery unit 12#3, battery module 12b2 of battery unit 12#4, battery module 12b1 of battery unit 12#4, and battery module 12b1 of battery unit 12#3 are connected in series, and a battery having a storage capacity of 10 kWh is connected between terminals T1a and T2a of BPU 32. A 10 kWh storage battery connected between terminals T1 and T2 of BPU32 and a 10 kWh storage battery connected between terminals T1a and T2a of BPU32 are connected in parallel through the internal wiring of the BPU, providing a storage battery device 10b with a total storage capacity of 20 kWh.

[0103] In the fourth modified example, the PCS 50 is connected to the bidirectional DC / DC converter 51 by one-to-one connection wiring, so that incorrect wiring during wiring work can be suppressed.

[0104] <Variation 5> In the storage battery equipment shown in the embodiment and the first to fourth modifications, the BPU (11, 21, 31, 32) and the fixture (Fixture) 13 combined with the storage battery unit (12, 22) may also have a connection function equivalent to the DC connection cable 14.

[0105] Fig. 14 is a block diagram showing a schematic configuration of a storage battery device 10d according to Modification 5. In Fig. 14, a fixture 13a having a module connection mechanism 13a1 is a basic configuration. 14 shows an example of an apparatus configuration including the above. In a storage battery apparatus 10d shown in FIG. 14, a terminal T2 connected to the positive electrode side of a storage battery module 12b2 of a storage battery unit 12#2 and a terminal T1 connected to the negative electrode side of a storage battery module 12b1 are connected in series via a module connection mechanism 13a1. Then, similar to the storage battery apparatus 10 of the embodiment shown in FIG. 4, a storage battery apparatus 10d having a storage capacity of 10 kWh and composed of two storage battery units 12#1 and 12#2 each having a basic capacity of 5 kWh is provided. Below, differences from the storage battery apparatus 10 of the embodiment will be mainly described, but the mounting (fixture) 13a equipped with the module connection mechanism 13a1 will also be described. This can be applied to any of the storage battery devices shown in Modifications 1 to 4.

[0106] The module connection mechanism 13a1 has, for example, a connector that can be fitted to the terminal T1 (for example, a male connector corresponding to the terminal T2) and a connector that can be fitted to the terminal T2 (for example, a female connector corresponding to the terminal T1), and the connectors are connected to each other by a connector in the fixture 13a. It is configured to be connected via a connecting wire.

[0107] 14, terminal T2 of BPU 11 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12#1, and terminal T1 of BPU 11 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12#1 via DC connection cable 14. Furthermore, terminal T2 connected to the positive electrode side of storage battery module 12b2 of storage battery unit 12#1 is connected to terminal T1 connected to the negative electrode side of storage battery module 12b2 of storage battery unit 12#2, and terminal T1 connected to the negative electrode side of storage battery module 12b1 of storage battery unit 12#1 is connected to terminal T2 connected to the positive electrode side of storage battery module 12b1 of storage battery unit 12#2 via DC connection cable 14. The terminal T2 connected to the positive terminal of the battery module 12b2 of the battery unit 12#2 is connected to the terminal T1 of the fixture 13a. The terminal T1 connected to the negative terminal of the module 12b1 and the terminal T2 of the fixture 13a are connected to each other. , are connected via a DC connection cable 14.

[0108] As a result, the storage battery module 12b2 of the storage battery unit 12#1, the storage battery module 12b2 of the storage battery unit 12#2, the storage battery module 12b1 of the storage battery unit 12#2, and the storage battery module 12b1 of the storage battery unit 12#1 are connected in series via the DC connection cable 14 and the module connection mechanism 13a1. In the storage battery equipment 10d according to the fifth modification, a 10k battery system is basically configured with at least one type of BPU 11, one type of storage battery unit 12, one type of fixture 13a, and one type of DC connection cable 14. A storage battery device having a storage capacity of Wh can be constructed. In the fifth modified example, the BPU 11 of the storage battery device 10d and the bidirectional DC / DC converter 51 of the PCS 50 are also connected by one-to-one connection wiring, which makes it possible to prevent incorrect wiring during wiring installation.

[0109] Furthermore, in the fifth modification, the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#2 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#2 are connected via the module connection mechanism 13a1. Therefore, for example, as shown in FIG. 5 etc., it is possible to relax the restriction on the separation distance "Y" between the terminals T1 and T2 arranged side by side in the left-right direction on the lower side of the connector arrangement surface of the storage battery unit 12.

[0110] That is, the distance between the terminal T1 arranged on the lower side of the connector arrangement surface of the storage battery unit 12#1 and the terminal T2 arranged on the upper side of the connector arrangement surface of the storage battery unit 12#2 is Distance "X" can be set so as to be the inter-terminal distance connected by a DC connection cable 14 that is predefined to a predetermined fixed length. Similarly, separation distance "Z" between terminal T2 located on the lower side of the connector arrangement surface of storage battery unit 12#1 and terminal T1 located on the upper side of the connector arrangement surface of storage battery unit 12#2 can be set so as to be the inter-terminal distance connected by a DC connection cable 14 that is predefined to a predetermined fixed length. Separation distance "Y" between terminals T1 and T2 that are arranged side by side in the left-right direction on the lower side of the connector arrangement surface of each storage battery unit 12 is set so as to be the inter-terminal distance that cannot be connected by a DC connection cable 14 that is predefined to a predetermined fixed length.

[0111] For example, the distance "Y" between terminals T1 and T2, which are arranged side by side in the left-right direction on the lower side of the connector arrangement surface of the storage battery unit 12, can be adjusted to the distance "L" between terminals T2 and T1, which are arranged side by side in the left-right direction on the upper side, so that they cannot be connected using a DC connection cable 14 with a predetermined fixed length. This arrangement can prevent improper connections, such as short circuits, within the same unit. Even when multiple storage battery units 12 are used, the length of the DC connection cable 14 can be visually compared with the distance between each terminal on the connector arrangement surface between the storage battery units 12, making it possible to clearly identify the connection locations using the DC connection cable 14 and prevent improper connection of the storage battery units 12 in the storage battery equipment 10d.

[0112] 15A and 15B are diagrams illustrating an example of the configuration of a storage battery equipment 10d according to Modification 5 in another capacity mode. FIG. 15A shows a storage battery equipment 10d including one BPU 11, three storage battery units (12#1, 12#2, 12#3), and a fixture 13a. 15(2) illustrates a storage battery equipment 10d including one BPU 11, one storage battery unit 12, and a fixture 13a. In the configuration (1), a storage capacity of 15 kWh is achieved by connecting BPU 11, three storage battery units (12#1, 12#2, 12#3) with a basic capacity of 5 kWh, and fixture 13a in series. In the configuration of FIG. 15(2), a storage capacity of 5 kWh is provided by connecting in series a BPU 11, a storage battery unit 12 with a basic capacity of 5 kWh, and a fixture 13a.

[0113] In the configuration of FIG. 15(1), the terminal T2 connected to the positive terminal of the battery module 12b2 of the battery unit 12#3 and the terminal T1 of the fixture 13a are connected to the positive terminal of the battery module 12b2 of the battery unit 12#3. The terminal T1 connected to the negative terminal of the battery module 12b1 and the terminal T2 connected to the negative terminal of the fixture 13a Terminal T2 is connected via a DC connection cable 14. In the battery device 10 according to the embodiment, the module connection mechanism 13a1 connects the terminal T2 connected to the positive electrode side of the battery module 12b2 of the battery unit 12#3 in series with the terminal T1 connected to the negative electrode side of the battery module 12b1. The other connections are the same as those in the battery device 10 according to the embodiment shown in FIG. 6(1).

[0114] As a result, the storage battery module 12b2 of the storage battery unit 12#1, the storage battery module 12b2 of the storage battery unit 12#2, the storage battery module 12b2 of the storage battery unit 12#3, the storage battery module 12b1 of the storage battery unit 12#3, the storage battery module 12b1 of the storage battery unit 12#2, and the storage battery module 12b1 of the storage battery unit 12#1 are connected in series via the DC connection cable 14 and the module connection mechanism 13a1. A storage battery device 10d having this configuration and a storage capacity of 15 kWh is provided.

[0115] In the configuration of FIG. 15(2), the terminal T2 connected to the positive terminal of the storage battery module 12b2 of the storage battery unit 12, the terminal T1 of the stand (Fixture) 13a, and the storage battery Terminal T1 connected to the negative terminal of module 12b1 and terminal T2 of fixture 13a are connected via a DC connection cable 14. In this case, the module connection mechanism 13a1 connects in series the terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12 and the terminal T1 connected to the negative electrode side of the storage battery module 12b1. The other connections are the same as those of the storage battery device 10 according to the embodiment shown in FIG. 6(2).

[0116] 15(2), the battery module 12b2 of the battery unit 12 and the battery module 12b1 of the battery unit 12 are connected in series via the DC connection cable 14 and the module connection mechanism 13a1. One type of BPU 11, one type of battery unit 12 with a basic capacity of 5 kWh, one type of fixture 13a, and one type of DC connection cable 14 are connected in series. A storage battery device 10d having a storage capacity of 15 kWh and based on the battery 14 is provided.

[0117] <Variation 6> As described in the fifth modification, the module connection mechanism 13a1 is provided in the fixture 13a. By providing the above, it is possible to increase the degree of freedom in the arrangement positions of the terminals (T1, T2) on the connector arrangement surface of one or more storage battery units 12 constituting a storage battery apparatus 10d with a variable capacity. That is, by arranging the terminals (T1, T2) at terminal distances "X" and "Z" connectable with a DC connection cable 14 predefined to a predetermined fixed length, it is possible to make terminal connections using the DC connection cable 14 impossible within the same storage battery unit, and to make terminal connections possible only between separate units constituting the storage battery apparatus 10d (between BPU / storage battery module, between storage battery modules, between storage battery modules and a fixture). In other words, the terminals (T1, T2) connected to one storage battery module of the storage battery unit 12 and the terminals (T1, T2) connected to the other storage battery module or the terminals (T1, T2) connected to the connection wiring 12b4 can be configured to be arranged on different housing surfaces. The storage battery device 10e of the sixth modification is configured so that the terminals (T1, T2) related to the terminal-to-terminal connection between the units are arranged on different housing surfaces.

[0118] Fig. 16 is a block diagram showing a schematic configuration of a storage battery equipment 10e according to Modification 6. In Fig. 16, a BPU 11, a storage battery unit 12, a fixture 13a, and a DC The storage battery device 10e has a storage capacity of 15 kWh and is basically configured with a connection cable 14. Each unit constituting the storage battery device 10e is the same as that of the storage battery device 10d in the fifth modification. The following mainly describes the differences from the storage battery device 10d in the fifth modification. However, the arrangement of the terminals (T1, T2) relating to the terminal-to-terminal connection between the units in the storage battery device is the same as that of the embodiment in which the basic configuration includes a mount (fixture) 13a equipped with a module connection mechanism 13a1. The present invention can be applied to any of the storage battery devices shown in Modifications 1 to 4.

[0119] In Fig. 16, rectangular frames 10e1 and 10e2 in dashed lines represent terminal groups related to inter-unit connection in the storage battery equipment 10e. Rectangular frame 10e1 is, for example, a terminal group related to series connection of storage battery modules 12b1 constituting storage battery units (12#1, 12#2, 12#3), and rectangular frame 10e2 is a terminal group related to series connection of storage battery modules 12b2. Note that in Fig. 16, the communication terminals T6 of the storage battery units connected by I / F connection cable 15 are configured to be included in rectangular frame 10e2, but the communication terminal group may also be included on the rectangular frame 10e1 side.

[0120] In the storage battery device 10e according to the sixth modification, the terminal group indicated by the rectangular frame 10e1 and the terminal group indicated by the rectangular frame 10e2 are arranged on different sides of the housing. For example, the terminal group indicated by the rectangular frame 10e1 is arranged on the left side of the storage battery unit 12, and the terminal group indicated by the rectangular frame 10e2 is arranged on the right side of the storage battery unit 12.

[0121] FIG. 17 is a diagram illustrating inter-unit connections in a storage battery equipment 10e according to Modification 6. FIG. 17 illustrates left, front, and right side views of a 15-kWh storage battery equipment 10e configured with storage battery units 12#1, 12#2, and 12#3, each with a basic capacity of 5 kWh. As shown in the left side view, a group of terminals indicated by a rectangular frame 10e1 are aligned and arranged on the left side of the storage battery equipment 10e so as to satisfy a predetermined separation distance. Here, the predetermined separation distance is the distance M (corresponding to separation distance "Y") between terminals connecting the units that allows connection via a DC connection cable 14. However, terminals T1 and T2 of the same storage battery unit 12 are arranged so as to satisfy a distance N at which connection via a DC connection cable 14 is impossible. Similarly, as shown in the right side view, a group of terminals indicated by a rectangular frame 10e2 are aligned and arranged on the right side of the storage battery equipment 10e so as to satisfy a predetermined separation distance.

[0122] 16 and 17, on the left side of the storage battery equipment 10e, the terminal T1 of the BPU 11 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#1, the terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#1 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#2 are connected via the DC connection cable 14. Similarly, the terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#2 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#3 are connected via the DC connection cable 14. 3a is connected to a terminal T2 via a DC connection cable 14.

[0123] On the right side of the storage battery equipment 10e, the terminal T2 of the BPU 11 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#1, the terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12#1 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#2 are connected via a DC connection cable 14. Similarly, the terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12#2 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#3, and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#3 and the terminal T1 of the frame (Fixture) 13a are connected via a DC connection cable 14. The terminals are connected via a cable 14. In the fixture 13a, the terminals T2 and terminal T1 are connected via module connection mechanism 13a1.

[0124] In the storage battery equipment 10e according to the sixth modification, the terminal group for the series connection of the storage battery module 12b1 constituting the storage battery units (12#1, 12#2, 12#3), indicated by the rectangular frame 10e1, can be arranged separately on the left side surface, and the terminal group for the series connection of the storage battery module 12b2, indicated by the rectangular frame 10e2, can be arranged separately on the right side surface. This can improve the effectiveness of preventing misconnections between units using the DC cable 14 during installation. Furthermore, since the terminal group indicated by the rectangular frame 10e1 and the terminal group indicated by the rectangular frame 10e2 can be arranged separately on different housing surfaces, the workability of connecting units using the DC cable 14 can be improved. Note that the communication terminals T6 of each storage battery unit connected by the I / F connection cable 15 may be arranged on the left side surface, the front housing surface, or the rear housing surface. The group of communication terminals T6, the group of terminals indicated by rectangular frames 10e1, and the group of terminals indicated by rectangular frames 10e2 are arranged on different housing surfaces, which further improves the workability when connecting units.

[0125] FIG. 18 is a diagram illustrating a configuration example of a storage battery equipment 10e according to Modification 6 in another capacity form. FIG. 18(1) shows a storage battery equipment providing a capacity of 10 kWh, which includes one BPU 11, two storage battery units (12#1, 12#2), and a mounting base (Fixture) 13a. The battery device 10e is exemplified in FIG. 18(2), which includes one BPU 11 and one battery storage device. The storage unit 12 and the fixture 13a provide a capacity of 5 kWh. The form of the battery device 10e is exemplified.

[0126] In Fig. 18(1), rectangular frames 10e1 and 10e2 drawn with dashed lines represent terminal groups related to inter-unit connection in the storage battery equipment 10e. Rectangular frame 10e1 is, for example, a terminal group related to the series connection of storage battery modules 12b1 of storage battery units (12#1 and 12#2), and rectangular frame 10e2 is a terminal group related to the series connection of storage battery modules 12b2. The same is true in Fig. 18(2). Note that in Figs. 18(1) and 18(2), the communication terminal groups T6 of the storage battery units connected by I / F connection cables 15 are configured to be included in rectangular frame 10e2, but the communication terminal groups may also be included on the rectangular frame 10e1 side.

[0127] 16 and 17, the terminal group indicated by rectangular frame 10e1 and the terminal group indicated by rectangular frame 10e2 are arranged on different housing surfaces. For example, the terminal group indicated by rectangular frame 10e1 is arranged on the left side of storage battery unit 12, and the terminal group indicated by rectangular frame 10e2 is arranged on the right side of storage battery unit 12. Needless to say, even in the 5 kWh and 10 kWh configurations, terminals T1 and T2 of the same storage battery unit 12 are arranged so that they cannot be connected via DC connection cable 14.

[0128] 18(1), on the left side of the storage battery equipment 10e, the terminal T1 of the BPU 11 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#1, and the terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#1 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#2 are connected via the DC connection cable 14. In addition, the terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#2 and the terminal T 2 are connected via a DC connection cable 14. On the right side of the storage battery equipment 10e, the terminal T2 of the BPU 11 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#1, and the terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12#1 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#2 are connected via a DC connection cable 14. The terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#2 and the terminal T1 of the frame (Fixture) 13a are connected via a DC connection cable 14. In the fixture 13a, the terminal T2 and the terminal T1 are connected via the The connection is made via a module connection mechanism 13a1.

[0129] Even in the 10 kWh capacity configuration shown in Figure 18(1), the storage battery device 10e can be arranged with the terminal group related to the series connection of the storage battery module 12b1 that constitutes the storage battery unit (12#1, 12#2) on the left side surface and the terminal group related to the series connection of the storage battery module 12b2 on the right side surface.

[0130] In addition, in the configuration shown in Figure 18(2), on the left side of the storage battery device 10e, terminal T1 of the BPU 11 and terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12, and terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12 and terminal T2 of the frame (Fixture) 13a are connected via a DC connection cable 14. Similarly, on the right side of the storage battery equipment 10e, a terminal T2 of the BPU 11 is connected to a terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12, a terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12 is connected to a terminal T3 of the fixture 1 The terminal T1 of the fixture 13a is connected to the terminal T2 of the fixture 13a via a DC connection cable 14. In the fixture 13a, the terminal T2 and the terminal T1 are connected to each other via a module connection mechanism 13a1. In the 5 kWh capacity configuration shown in FIG. 18(2), the storage battery device 10e also has a terminal group for series connection of the storage battery modules 12b1 that make up the storage battery unit 12 on the left side. On the other hand, a group of terminals for series connection of the battery module 12b2 can be separately arranged on the right side surface.

[0131] In the storage battery device 10e according to Modification 6, even in the 5 kWh and 10 kWh capacity configurations, the terminal group indicated by the rectangular frame 10e1 and the terminal group indicated by the rectangular frame 10e2 can be arranged separately on different housing surfaces, thereby preventing incorrect connection between units using the DC cable 14 during installation and improving workability when connecting the units. Furthermore, the communication terminals T6 of each storage battery unit connected by the I / F connection cable 15 may be arranged on the left side, the front housing surface, or the rear housing surface. For example, by arranging the communication terminals T6, the terminal group indicated by the rectangular frame 10e1, and the terminal group indicated by the rectangular frame 10e2 on different housing surfaces, workability when connecting the units can be further improved.

[0132] <Variation 7> As described in Modification 6, when the terminal group indicated by the rectangular frame 10e1 and the terminal group indicated by the rectangular frame 10e2 are separately arranged on different housing surfaces, the types of terminals for inter-unit connection can be the same. That is, the terminals T1 and T2 of the BPU 11, the terminal T2 connected to the positive side and the terminal T1 connected to the negative side of the storage battery module 12b1 of the storage battery unit 12, the terminal T2 connected to the positive side and the terminal T1 connected to the negative side of the storage battery module 12b2, the terminals T1 and T2 of the fixture 13a, 2 can all be configured with the same terminal type. For example, it is also possible to configure each of the above terminals with a common female connector, and connect the units with a DC connection cable 14a having male connectors at both ends that fit into the female connectors. Similarly, it is also possible to configure each of the above terminals with a common male connector, and connect the units with a DC connection cable 14a having female connectors at both ends that fit into the male connectors. In the storage battery device 10f according to the seventh modification, the types of terminals for connecting the units are unified to the same type of terminals, and separate units (between BPU / storage battery module, between storage battery modules, between storage battery modules and a fixture) can be connected using a DC connection cable 14a having connectors at both ends that fit into the terminals. .

[0133] FIG. 19 is a diagram illustrating the inter-unit connections of a storage battery system 10f according to Modification 7. FIG. 19 illustrates left, front, and right side views of a storage battery system 10f with a 15 kWh capacity, which is composed of storage battery units 12#1, 12#2, and 12#3, each with a basic capacity of 5 kWh. As shown in the left side view, the terminal groups included in the rectangular frame 10e1 of Modification 6 are aligned and arranged on the left side of the storage battery system 10f so as to satisfy a predetermined distance. As shown in the right side view, the terminal groups included in the rectangular frame 10e2 are aligned and arranged on the right side of the storage battery system 10f so as to satisfy a predetermined distance. The predetermined replacement distance is the same as in Modification 6.

[0134] However, as described above, the terminals T1 and T2 of the BPU 11, the terminal T2 connected to the positive side and the terminal T1 connected to the negative side of the storage battery module 12b1 of the storage battery unit 12, the terminal T2 connected to the positive side and the terminal T1 connected to the negative side of the storage battery module 12b2, and the terminals T1 and T2 of the fixture 13a are unified by a common connector terminal type. Both ends of the DC connection cable 14a are configured to be provided with connector terminals that can be fitted into the unified connector terminal type.

[0135] On the left side of the storage battery equipment 10f, a terminal T1 of the BPU 11 and a terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#1, a terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#1 and a terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#2 are connected to each other through a DC connection cable 14. Similarly, the terminal T1 connected to the negative electrode side of the storage battery module 12b1 of the storage battery unit 12#2 and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#3 are connected to each other via a DC connection cable. The connection is made via a cable 14a. On the right side of the storage battery equipment 10f, the terminal T2 of the BPU 11 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#1, the terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12#1 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#2 are connected via a DC connection cable 14a. Similarly, the terminal T2 connected to the positive electrode side of the storage battery module 12b2 of the storage battery unit 12#2 and the terminal T1 connected to the negative electrode side of the storage battery module 12b2 of the storage battery unit 12#3, and the terminal T2 connected to the positive electrode side of the storage battery module 12b1 of the storage battery unit 12#3 and the terminal T1 of the frame (Fixture 13a) are connected via a DC connection cable 14a. The connection is made via a cable 14a. In the fixture 13a, a terminal T2 and terminal T1 are connected via a module connection mechanism 13a1.

[0136] As a result, the storage battery device 10f according to the seventh modification can achieve the same effect as the storage battery device 10e shown in the sixth modification. Furthermore, when connecting units, the connectors provided on both ends of the DC connection cable 14a are configured as the same connectors, so there is no need to check the orientation of the cable (the type of connector that can be fitted to the terminals T1, T2, such as male or female), which further improves workability. Furthermore, at least the terminals related to the connection between separate units that make up the storage battery device 10f (between BPU / storage battery module, between storage battery modules, between storage battery modules, and between storage battery module / fixture) can be consolidated. Cost reductions can be expected through the consolidation of parts.

[0137] (others) The above-described embodiment is merely an example, and the disclosure of the present embodiment may be appropriately modified and implemented without departing from the spirit thereof. The processes and means described in the present disclosure may be freely combined and implemented as long as no technical contradiction occurs.

[0138] Furthermore, a process described as being performed by one device may be shared and executed by multiple devices. Alternatively, a process described as being performed by different devices may be executed by a single device. The hardware configuration for implementing each function can be flexibly changed. For example, a power conditioner (PCS) 50 constituting the storage battery system 100 may be configured to include one or more storage battery units 12. A control unit of the PCS 50 has the function of the control unit 11a of the BPU 11, and can perform charge / discharge control based on information regarding charge / discharge notified from each storage battery unit 12.

[0139] In the following, the constituent elements of the present invention will be described with reference to the reference numerals in the drawings in order to make it possible to compare the constituent elements of the present invention with the configurations of the embodiments. <Invention 1> A storage battery unit (12, 22) that houses at least one storage battery module (12b1, 12b2, 12b3) having a unit capacity in a housing, a first terminal (T1, T2) connected to one of the positive and negative sides of a first storage battery module (12b1, 12b2, 12b3); and a second terminal (T1, T2) connected to the other of the positive and negative sides of the first storage battery module (12b1, 12b2, 12b3); a third terminal (T1, T2) connected to one of the positive and negative sides of the second storage battery module (12b1, 12b2, 12b3); and a fourth terminal (T1, T2) connected to the other of the positive and negative sides of the second storage battery module (12b1, 12b2, 12b3). , and the same housing surface on which the the first terminals (T1, T2) and the fourth terminals (T1, T2) are arranged on one end side of the housing surface such that the polarity of the first storage battery module (12b1, 12b2, 12b3) connected to the first terminals (T1, T2) is different from the polarity of the second storage battery module (12b1, 12b2, 12b3) connected to the fourth terminals (T1, T2), and the second terminals (T1, T2) and the third terminals (T1, T2) are arranged on the other end side of the housing surface such that the polarity of the first storage battery module (12b1, 12b2, 12b3) connected to the second terminals (T1, T2) is different from the polarity of the second storage battery module (12b1, 12b2, 12b3) connected to the third terminals (T1, T2); The terminals are arranged so that a first distance between the first terminals (T1, T2) and the fourth terminals (T1, T2) and a second distance between the second terminals (T1, T2) and the third terminals (T1, T2) satisfy a predetermined condition. A storage battery unit (12, 22). [Explanation of symbols]

[0140] 10, 10a, 10b, 10c, 10d, 10e, 10f, 40, 40a, 40b storage battery device 11, 21, 31, 32 BPU 12, 22 Battery unit 12b1, 12b2, 12b3, 41, 41a, 41b Battery Modules 13, 13a Mounting stand 13a1 Module connection mechanism 14, 14a DC connection cable 15 I / F connection cable 42b, 51, 54a, 54b, 54c Bidirectional DC / DC Converters 50 Power Conditioner (PCS) 52 INV (bidirectional inverter) 53 DC bus 60 Power Conditioner (PCS) 61 Unidirectional DC / DC Converter 70 Photovoltaic Modules (PV) 80 load 90 Power system 100 Battery Storage System 150 Power Generation System 200 Distributed Power Systems T1, T2, T3, T4 terminals (for connection) T5, T6 terminals (for communication)

Claims

1. A storage battery unit that houses at least one storage battery module having a unit capacity in a housing, a first terminal connected to one of the positive and negative terminals of a first storage battery module; and a second terminal connected to the other of the positive and negative terminals of the first storage battery module; a third terminal connected to one of the positive electrode side or the negative electrode side of a second storage battery module and a fourth terminal connected to the other of the positive electrode side or the negative electrode side of the second storage battery module are disposed on the same housing surface; the first terminal and the fourth terminal are arranged on one end side of the housing surface such that a polarity of the first storage battery module connected to the first terminal differs from a polarity of the second storage battery module connected to the fourth terminal, and the second terminal and the third terminal are arranged on the other end side of the housing surface such that a polarity of the first storage battery module connected to the second terminal differs from a polarity of the second storage battery module connected to the third terminal; When the distance between the first terminal and the fourth terminal is a first distance and the distance between the second terminal and the third terminal is a second distance, the second distance is a distance that allows connection by a connection cable having a predetermined length for connecting the second terminal and the third terminal, the connection cable having a first mating terminal at one end that fits into the first terminal and a second mating terminal at the other end that fits into the second terminal, the first mating terminal being matable with the third terminal and the second mating terminal being matable with the fourth terminal, and the first distance is a distance that does not allow connection between the first terminal and the second terminal, and between the third terminal and the fourth terminal, and the first distance is a distance that does not allow connection between the first terminal and the fourth terminal by the connection cable; A storage battery unit characterized by:

2. A storage battery unit that houses at least one storage battery module having a unit capacity in a housing, a first terminal connected to one of the positive and negative terminals of a first storage battery module; and a second terminal connected to the other of the positive and negative terminals of the first storage battery module; a third terminal connected to one of the positive electrode side or the negative electrode side of a second storage battery module and a fourth terminal connected to the other of the positive electrode side or the negative electrode side of the second storage battery module are disposed on the same housing surface; the first terminal and the fourth terminal are arranged on one end side of the housing surface such that a polarity of the first storage battery module connected to the first terminal differs from a polarity of the second storage battery module connected to the fourth terminal, and the second terminal and the third terminal are arranged on the other end side of the housing surface such that a polarity of the first storage battery module connected to the second terminal differs from a polarity of the second storage battery module connected to the third terminal; When the distance between the first terminal and the fourth terminal is a first distance and the distance between the second terminal and the third terminal is a second distance, the first distance is a distance that allows the first terminal and the fourth terminal to be connected by a connection cable having a predetermined length for connecting the second terminal and the third terminal, a circuit for interrupting an overcurrent is provided in a connection path between the electrode of the first storage battery module connected to the first terminal or the second terminal, or in a connection path between the electrode of the second storage battery module connected to the third terminal or the fourth terminal.

3. A storage battery unit that houses at least one storage battery module having a unit capacity in a housing, a first terminal connected to one of the positive and negative terminals of a first storage battery module; and a second terminal connected to the other of the positive and negative terminals of the first storage battery module; a third terminal and a fourth terminal connected to the third terminal by a wiring are disposed on the same housing surface; the first terminal and the fourth terminal are arranged on one end side of the housing surface, and the second terminal and the third terminal are arranged on the other end side of the housing surface, When the distance between the first terminal and the fourth terminal is a first distance and the distance between the second terminal and the third terminal is a second distance, the second distance is a distance that allows connection by a connection cable having a predetermined length for connecting the second terminal and the third terminal, the connection cable having a first mating terminal at one end that fits into the first terminal and a second mating terminal at the other end that fits into the second terminal, the first mating terminal being matable with the third terminal and the second mating terminal being matable with the fourth terminal, and the first distance is a distance that does not allow connection between the first terminal and the second terminal, and between the third terminal and the fourth terminal, and the first distance is a distance that does not allow connection between the first terminal and the fourth terminal by the connection cable; A storage battery unit characterized by:

4. A storage battery unit that houses at least one storage battery module having a unit capacity in a housing, a first housing surface on which a first terminal connected to one of the positive and negative sides of a first storage battery module and a second terminal connected to the other of the positive and negative sides of the first storage battery module are disposed; a second housing surface on which a third terminal connected to one of the positive electrode side or the negative electrode side of a second storage battery module and a fourth terminal connected to the other of the positive electrode side or the negative electrode side of the second storage battery module are disposed; the first terminal is disposed on one end side of the first housing surface, the second terminal is disposed on the other end side of the first housing surface, the fourth terminal is disposed on one end side of the second housing surface, and the third terminal is disposed on the other end side; the polarity of the first storage battery module connected to a first terminal arranged on one end side of the first housing surface is different from the polarity of the second storage battery module connected to a fourth terminal arranged on one end side of the second housing surface; The first and second terminals arranged on the first housing surface and the third and fourth terminals arranged on the second housing surface are connection cables each having a predetermined length, and each having a first mating terminal at one end that fits into the first terminal and a second mating terminal at the other end that fits into the second terminal. the first mating terminal is matable with the third terminal, and the second mating terminal is arranged at a distance such that they cannot be connected by a connection cable configured to be matable with the fourth terminal. A storage battery unit characterized by:

5. The battery unit according to claim 4 , wherein the first housing surface and the second housing surface constitute opposing surfaces of a housing that houses the first storage battery module and the second storage battery module.

6. The battery unit according to claim 4 or 5, wherein a third terminal and a fourth terminal connected to the third terminal by a wire are arranged on the second housing surface.

7. 7. A storage battery unit according to claim 4, wherein the first terminal and the second terminal arranged on the first housing surface and the third terminal and the fourth terminal arranged on the second housing surface are composed of terminals of a single type, and the first mating terminal and the second mating terminal provided on the connection cable are composed of mating terminals that can be mated with the terminals of the single type.

8. A storage battery apparatus including a plurality of storage battery units according to any one of claims 1 to 3, a connection cable having a first fitting terminal at one end adapted to fit into the first terminal and a second fitting terminal at the other end adapted to fit into the second terminal, the first fitting terminal being adapted to be able to fit into the third terminal, and the second fitting terminal being adapted to be able to fit into the fourth terminal; a second terminal arranged on a housing surface of a first storage battery unit and a first terminal arranged on a housing surface of a second storage battery unit, and a third terminal arranged on a housing surface of the first storage battery unit and a fourth terminal arranged on a housing surface of the second storage battery unit are connected by the connection cable whose length is specified in advance to connect the second terminal and the third terminal; A storage battery device characterized by:

9. A storage battery apparatus including a plurality of storage battery units according to any one of claims 4 to 7, a connection cable having a first fitting terminal at one end adapted to fit into the first terminal and a second fitting terminal at the other end adapted to fit into the second terminal, the first fitting terminal being adapted to be able to fit into the third terminal, and the second fitting terminal being adapted to be able to fit into the fourth terminal; a second terminal arranged on the first housing surface of the first storage battery unit and a first terminal arranged on the first housing surface of the second storage battery unit, and a fourth terminal arranged on the second housing surface of the first storage battery unit and a third terminal arranged on the second housing surface of the second storage battery unit are connected by the connection cable, the length of which is predetermined to connect the second terminal arranged on the first housing surface of the first storage battery unit and the first terminal arranged on the first housing surface of the second storage battery unit; A storage battery device characterized by:

10. a mount in which the first terminal is arranged on a first housing surface and the second terminal is arranged on a second housing surface opposite to the first housing surface, and the first terminal arranged on the first housing surface and the second terminal arranged on the second housing surface are connected by a wiring mechanism; The storage battery device of claim 9, wherein the first terminal arranged on the first housing surface of the stand and the second terminal arranged on the first housing surface of the second storage battery unit, and the second terminal arranged on the second housing surface of the stand and the third terminal arranged on the second housing surface of the second storage battery unit are further connected by the connection cable.

11. 11. The storage battery device according to claim 9, wherein the first fitting terminal and the second fitting terminal of the connection cable are configured as the same fitting terminal.

Images