Secondary battery module, secondary battery pack, power storage / generation system

Abstract

To obtain: a secondary battery module that in the case of simultaneously performing charging and discharging and even when noise is generated on the charging side, can mitigate propagation of the noise to the discharging side; a secondary battery pack comprising the secondary battery module; and a power storage / generation system.SOLUTION: A secondary battery module 20 has a three terminal-type secondary battery 32 having a first terminal for charging, a second terminal for discharging, and a third terminal to be used for at least one of charging and discharging, the secondary battery being included in at least one of one end and the other end of a plurality of secondary batteries 22 connected in series.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a secondary battery module, a secondary battery pack, and a power storage system. [Background technology]

[0002] Energy storage elements in which a first terminal for charging is connected to the outer periphery of a positive electrode current collector, a second terminal used for at least one of charging and discharging is connected to the outer periphery of a negative electrode current collector, and a third terminal for discharging is connected to the outer periphery of either the positive electrode current collector or the negative electrode current collector have been known for some time (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 240183 Summary of the Invention [Problem to be solved by the invention]

[0004] In a secondary battery module consisting of only two-terminal secondary batteries having only two terminals, when charging and discharging are performed simultaneously, the positive and negative terminals used as the charging side (input side) and the positive and negative terminals used as the discharging side (output side) are inevitably the same terminals. Therefore, if noise occurs on the charging side, the noise will propagate to the device connected to the terminals on the discharging side, increasing the risk of the device malfunctioning or breaking down.

[0005] Therefore, an object of the present invention is to provide a secondary battery module that can reduce the propagation of noise to the discharging side even if noise occurs on the charging side when charging and discharging are performed simultaneously, a secondary battery pack including the secondary battery module, and a power storage system. [Means for solving the problem]

[0006] In order to achieve the above object, a secondary battery module of a first aspect of the present invention includes a three-terminal secondary battery having a first terminal for charging, a second terminal for discharging, and a third terminal used for at least one of charging and discharging, at at least one end and the other end of a plurality of secondary batteries connected in series.

[0007] According to the first aspect of the invention, at least one of the two ends of a plurality of secondary batteries connected in series includes a three-terminal secondary battery. Therefore, when charging and discharging are performed simultaneously, the terminal used as the charging side and the terminal used as the discharging side can be separated. As a result, even if noise occurs on the charging side, the noise passes through the secondary battery, so that the propagation of the noise to the discharging side is reduced. Therefore, the risk of malfunction (malfunction or failure) caused by the propagation of the noise in the device connected to the discharging side terminal is reduced.

[0008] In addition, a secondary battery module of a second aspect of the present invention includes a plurality of three-terminal secondary batteries connected in parallel, each having a first terminal for charging, a second terminal for discharging, and a third terminal used for at least one of charging and discharging, and the plurality of three-terminal secondary batteries connected in parallel are included at at least one of one ends and the other end of a plurality of secondary batteries connected in series.

[0009] According to the second aspect of the invention, at least one of the ends of the multiple secondary batteries connected in series includes multiple three-terminal secondary batteries connected in parallel. Therefore, when charging and discharging are performed simultaneously, the terminal used as the charging side and the terminal used as the discharging side can be separated. As a result, even if noise occurs on the charging side, the noise passes through the secondary battery, so the propagation of the noise to the discharging side is reduced. Therefore, the risk of malfunction (malfunction or failure) caused by the propagation of the noise in the device connected to the discharging terminal is reduced.

[0010] A secondary battery pack according to a third aspect of the present invention is configured by connecting a plurality of secondary battery modules according to the first or second aspect in series.

[0011] According to the third aspect of the invention, a secondary battery pack can be obtained in which, when charging and discharging are performed simultaneously, even if noise occurs on the charging side, the propagation of the noise to the discharging side is reduced.

[0012] Furthermore, a third aspect of the present invention provides a power storage system including a power generation device and the secondary battery module of the first or second aspect or the secondary battery pack of the third aspect to which the power generation device is electrically connected.

[0013] According to the fourth aspect of the invention, when charging and discharging are performed simultaneously, even if noise occurs on the charging side, the propagation of the noise to the discharging side is reduced, and the risk of malfunctions caused by the noise propagation in devices connected to the discharging side terminal is reduced.

[0014] Furthermore, a fifth aspect of the power storage system according to the present invention is the power storage system of the fourth aspect, wherein the power generation device is a power generation device that generates power by receiving light, and the power generation device is directly connected to the secondary battery module or the secondary battery pack.

[0015] According to the fifth aspect of the invention, when charging and discharging are performed simultaneously, since the charging side terminal and the discharging side terminal are separate, not only is the propagation of noise generated on the charging side reduced to the discharging side, but also the effect of a voltage drop at the charging side terminal caused by the operation of a device connected to the discharging side is reduced, and the voltage at the charging side terminal can be kept higher than the voltage at the discharging side terminal. As a result, if the charging end voltage of the secondary battery module or secondary battery pack is appropriately set to be slightly lower than the maximum output voltage of a power generation device that generates power by receiving light, the generated voltage by the power generation device can be kept close to the maximum output voltage. Therefore, a decrease in the amount of power generated by the power generation device is suppressed. Effect of the Invention

[0016] As described above, according to the present invention, when charging and discharging are performed simultaneously, even if noise occurs on the charging side, the propagation of the noise to the discharging side can be reduced. [Brief description of the drawings]

[0017] [Figure 1] 1 is a block diagram showing a configuration of a power storage system according to an embodiment of the present invention; [Diagram 2] 1 is a schematic configuration diagram showing a secondary battery module according to a first embodiment. [Diagram 3] FIG. 11 is a schematic configuration diagram showing a secondary battery module according to a second embodiment. [Figure 4] FIG. 11 is a schematic configuration diagram showing a secondary battery pack including a plurality of secondary battery modules according to a second embodiment. [Diagram 5] 13 is a schematic configuration diagram showing a modified example of a secondary battery pack including a plurality of secondary battery modules according to the second embodiment. FIG. [Figure 6] FIG. 11 is a schematic configuration diagram showing a secondary battery module according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following, the terms "one end" and "the other end" refer to the ends as the terms suggest.

[0019] 1, the power storage system 10 according to this embodiment includes a power generator 12 and a secondary battery module 20 (which may be a secondary battery pack 30 described below) that is electrically connected directly to the power generator 12. Note that the term "direct connection" used here means that there is no device electrically connected between the power generator 12 and the secondary battery module 20 (or the secondary battery pack 30).

[0020] The power generation device 12 is, for example, a power generation device having a solar panel that generates power by receiving sunlight, and the power storage system 10 according to this embodiment is, for example, a renewable energy power storage system. Note that, in addition to sunlight, examples of renewable energy include wind power and hydraulic power, and the power storage system 10 according to this embodiment may include a power generation device (not shown) that generates power using these renewable energies.

[0021] The secondary battery module 20 includes a plurality of secondary batteries 22 (see FIGS. 2 to 6) housed in a case (not shown) or the like, and each secondary battery 22 may have any chemical structure as long as it is configured to be capable of repeated charging and discharging. The secondary battery module 20 (or secondary battery pack 30) is electrically connected to an outlet 16 via a DC / AC inverter 14.

[0022] An appliance such as an electric appliance (not shown) is connected to the outlet 16, and electricity is supplied to the appliance from the outlet 16. In the following, the appliance such as an electric appliance connected to the outlet 16 is referred to as a "load 18" and is shown in Figures 2 to 6. Also, the DC / AC inverter 14 is not shown in Figures 2 to 6.

[0023] First Embodiment 2, the secondary battery module 20 according to the first embodiment is configured by connecting in series a plurality (four in the figure) of secondary batteries 22. Specifically, three two-terminal secondary batteries 24, 26, 28 and one three-terminal secondary battery 32 are connected in series, and the three-terminal secondary battery 32 is disposed at one end of the plurality of secondary batteries 22 connected in series.

[0024] The three-terminal secondary battery 32 has a first terminal for charging, a second terminal for discharging, and a third terminal used for at least one of charging and discharging. Specifically, the three-terminal secondary battery 32 has two + (plus) terminals provided on opposite sides of the secondary battery body 32A in the longitudinal direction, and one - (minus) terminal provided on one side of the secondary battery body 32A in the longitudinal direction. Therefore, the secondary battery modules 20 are connected in series as follows.

[0025] That is, starting from the other end side (opposite the one end) of the multiple secondary batteries 22 connected in series, the + terminal of the two-terminal secondary battery 24 and the - terminal of the two-terminal secondary battery 26 are connected by an electric wire E1, the + terminal of the two-terminal secondary battery 26 and the - terminal of the two-terminal secondary battery 28 are connected by an electric wire E2, and the + terminal of the two-terminal secondary battery 28 and the - terminal of the three-terminal secondary battery 32 are connected by an electric wire E3. The electric wires E1 to E3 connecting the secondary batteries 22 together also include electrically conductive metal plates or the like.

[0026] A power generating device 12 having a solar panel is directly connected to the negative terminal of the two-terminal secondary battery 24 at the other end and the other positive terminal of the three-terminal secondary battery 32 at one end by electric wires E4 and E5. This allows the secondary battery module 20 to be charged. A load 18 is connected to the negative terminal of the two-terminal secondary battery 24 at the other end and one positive terminal of the three-terminal secondary battery 32 at one end by electric wires E6 and E7. This allows the secondary battery module 20 to be discharged.

[0027] Next, the operation of the secondary battery module 20 and the power storage system 10 according to the first embodiment configured as above will be described.

[0028] 2, in the three-terminal secondary battery 32 in the secondary battery module 20 according to the first embodiment, the + terminal connected to the power generation device 12 and the + terminal connected to the load 18 are separate terminals that are independent of each other (provided on opposite sides of each other). In other words, when charging and discharging are performed simultaneously (when discharging while charging), the + terminal used as the charging side (input side) and the + terminal used as the discharging side (output side) are separate.

[0029] Here, in the case of a power generation equipment (not shown) that is prone to generating noise in the generated electricity, such as a wind power generator, in a conventional configuration in which load 18 is connected to the same terminal as the power generation equipment, the noise generated by the power generation equipment is transmitted directly to load 18, increasing the risk of affecting the operation of load 18 (inducing a malfunction) or inducing a breakdown in load 18.

[0030] In contrast, in the configuration of the secondary battery module 20 according to the first embodiment, as described above, the charging side and the discharging side are connected to different terminals. Therefore, even if noise occurs on the charging side (power generating device) when charging and discharging are performed simultaneously, the charged power passes through the electrodes in the secondary battery once before flowing to the discharging side, so that the noise generated in the power generating device during this time can be reduced. In other words, the propagation of the noise to the discharging side can be reduced. Therefore, the risk of unintended problems (malfunctions and breakdowns) occurring due to the propagation of the noise in the load 18 connected to the discharging side terminal can be reduced.

[0031] In addition, even if the voltage at the discharge terminal fluctuates (drops) due to the operation of the load 18 connected to the discharge terminal, the voltage drop at the charge terminal due to the fluctuating voltage can be suppressed (mitigated). In other words, the voltage at the charge terminal can be kept higher than the voltage at the discharge terminal.

[0032] Therefore, in the power storage system 10 including the secondary battery module 20 according to the first embodiment, if the charging end voltage of the secondary battery module 20 is appropriately set to be close to the maximum output voltage of the power generator 12 that generates power by receiving solar light (slightly lower than the maximum output voltage), the voltage generated by the power generator 12 can be kept close to the maximum output voltage. Therefore, the decrease in the amount of power generated by the power generator 12 can be suppressed (mitigated).

[0033] In the following second and third embodiments, which use a secondary battery module 20 having a different configuration from that of the first embodiment, only the operation when the power generation source is the sun (light) will be described, but the operation when the power generation source is wind power occurs in the same manner as described above.

[0034] Furthermore, in the secondary battery module 20 according to the first embodiment, although not shown, the three-terminal secondary battery 32 may have two negative terminals provided on opposite sides of the secondary battery body 32A in the longitudinal direction and one positive terminal provided on one side of the secondary battery body 32A in the longitudinal direction. In this case, the two-terminal secondary batteries 24, 26, 28 are connected in series according to their polarities.

[0035] Although not shown in the figures, a plurality of secondary battery modules 20 according to the first embodiment may be connected in series to form a secondary battery pack such as a secondary battery pack 30 described below, and a power generation device 12 may be directly connected to the secondary battery pack, and a load 18 may be connected to form the power storage system 10.

[0036] <Second embodiment> Next, a second embodiment will be described. Note that the same reference numerals are used to designate the same parts as those in the first embodiment, and detailed descriptions thereof will be omitted as appropriate.

[0037] 3, the secondary battery module 20 according to the second embodiment is configured by connecting in series a plurality (four in the figure) of secondary batteries 22. Specifically, two two-terminal secondary batteries 26, 28 and two three-terminal secondary batteries 32, 34 are connected in series, and each of the three-terminal secondary batteries 32, 34 is disposed at one end and the other end of the plurality of secondary batteries 22 connected in series.

[0038] The three-terminal secondary battery 32 arranged at one end is the same as that in the first embodiment. The three-terminal secondary battery 34 arranged at the other end has a first terminal for charging, a second terminal for discharging, and a third terminal used for at least one of charging and discharging. Specifically, the three-terminal secondary battery 34 has two negative terminals provided on opposite sides of the secondary battery body 34A in the longitudinal direction, and one positive terminal provided on one side of the secondary battery body 34A in the longitudinal direction. Therefore, the secondary battery module 20 is connected in series as follows.

[0039] That is, the + terminal of the three-terminal secondary battery 34 at the other end and the - terminal of the two-terminal secondary battery 26 are connected by an electric wire E1, the + terminal of the two-terminal secondary battery 26 and the - terminal of the two-terminal secondary battery 28 are connected by an electric wire E2, and the + terminal of the two-terminal secondary battery 28 and the - terminal of the three-terminal secondary battery 32 at one end are connected by an electric wire E3. Note that the electric wires E1 to E3 connecting the secondary batteries 22 together include electrically conductive metal plates or the like, as in the above-described first embodiment.

[0040] A power generating device 12 having a solar panel is directly connected to the other negative terminal of the three-terminal secondary battery 34 at the other end and the other positive terminal of the three-terminal secondary battery 32 at one end by electric wires E4 and E5. This allows the secondary battery module 20 to be charged. A load 18 is connected to one negative terminal of the three-terminal secondary battery 34 at the other end and one positive terminal of the three-terminal secondary battery 32 at one end by electric wires E6 and E7. This allows the secondary battery module 20 to be discharged.

[0041] Next, the operation of the secondary battery module 20 and the power storage system 10 according to the second embodiment configured as described above will be described. Note that the explanation of the operation common to the first embodiment will be omitted as appropriate.

[0042] In the secondary battery module 20 of the second embodiment, in the three-terminal secondary battery 32 arranged at one end, the + terminal connected to the power generation device 12 and the + terminal connected to the load 18 are each separate and independent terminals (located on opposite sides of each other), and in the three-terminal secondary battery 34 arranged at the other end, the - terminal connected to the power generation device 12 and the - terminal connected to the load 18 are each separate and independent terminals (located on opposite sides of each other).

[0043] In other words, when charging and discharging are performed simultaneously (when discharging while charging), the + terminal used as the charging side (input side) is separate from the + terminal used as the discharging side (output side), and the - terminal used as the charging side (input side) is separate from the - terminal used as the discharging side (output side).

[0044] Therefore, even if the voltage at the discharge terminal fluctuates (drops) due to the operation of the load 18 connected to the discharge terminal, the resulting drop in the voltage at the charge terminal can be suppressed more effectively than in the secondary battery module 20 of the first embodiment, which uses a three-terminal secondary battery 32 at only one end.

[0045] That is, since the voltage at the charging terminal can be more effectively kept higher than the voltage at the discharging terminal, the power storage system 10 including the secondary battery module 20 according to the second embodiment can more effectively keep the voltage generated by the power generator 12 that generates power by receiving sunlight near the maximum output voltage. Therefore, the decrease in the amount of power generated by the power generator 12 can be more effectively suppressed (mitigated).

[0046] 4, for example, a secondary battery pack 30 may be configured by connecting a plurality of secondary battery modules 20 according to the second embodiment in series. Specifically, this secondary battery pack 30 is configured by connecting each secondary battery module 20 in series by connecting the negative terminal of a three-terminal secondary battery 34 arranged at the other end of the secondary battery module 20 to the positive terminal of a three-terminal secondary battery 32 arranged at one end of the secondary battery module 20 adjacent to that secondary battery module 20 by an electric wire E8.

[0047] In the secondary battery module 20 arranged at one end of the secondary battery pack 30, a load 18 is connected by electric wires E9, E10 to the + terminal of a three-terminal secondary battery 32 arranged at one end of the secondary battery module 20, and to the - terminal of a three-terminal secondary battery 34 arranged at the other end of the secondary battery module 20 at the other end of the secondary battery pack 30. Therefore, the power storage system 10 including this secondary battery pack 30 can supply high-voltage electricity to the load 18.

[0048] In the illustrated secondary battery pack 30, a case in which a plurality of secondary battery modules 20 are one-dimensionally accommodated in a case not shown is shown as an example, but the secondary battery pack 30 may be configured by accommodating a plurality of secondary battery modules 20 two-dimensionally in a case not shown. Also, a secondary battery pack may be configured by accommodating a plurality of secondary battery modules 20 according to the first embodiment two-dimensionally in a case not shown.

[0049] 4 shows an example in which a single power generation device 12 is directly connected to the secondary battery pack 30. That is, in a secondary battery module 20 arranged at one end of the secondary battery pack 30, a single power generation device 12 is directly connected to a positive terminal of a three-terminal secondary battery 32 arranged at one end of the secondary battery module 20, and to a negative terminal of a three-terminal secondary battery 34 arranged at the other end of the secondary battery module 20, in a secondary battery module 20 arranged at the other end of the secondary battery pack 30. However, the present invention is not limited to this, and a power generation device 12 may be directly connected to each secondary battery module 20, as in the power generation system 10 shown in FIG.

[0050] <Third embodiment> Finally, a third embodiment will be described below. Note that the same reference numerals are used to designate the same parts as those in the first and second embodiments, and detailed descriptions thereof will be omitted as appropriate.

[0051] 6, the secondary battery module 20 according to the third embodiment is configured by connecting a plurality of (three in the figure) secondary batteries 22 in parallel, and the parallel-connected plurality of secondary batteries 22 are connected in series to a plurality of (three in the figure). Specifically, three three-terminal secondary batteries 32, 34, 36 having an electric capacity of 10 Ah (ampere-hours) are connected in parallel, and the three three-terminal secondary batteries 32, 34, 36 connected in parallel are connected in series to three two-terminal secondary batteries 24, 26, 28 having an electric capacity of 30 Ah (ampere-hours). Each of the three-terminal secondary batteries 32, 34, 36 is disposed at one end of the plurality of secondary batteries 22 connected in series.

[0052] Each of the three-terminal secondary batteries 32, 34, 36 arranged at one end has a first terminal for charging, a second terminal for discharging, and a third terminal used for at least one of charging and discharging. Specifically, each of the three-terminal secondary batteries 32A, 34A, 36A has two + terminals provided on opposite sides of the secondary battery main bodies 32A, 34A, 36A in the longitudinal direction, and one - terminal provided on one side of the secondary battery main bodies 32A, 34A, 36A in the longitudinal direction. Therefore, this secondary battery module 20 is connected in series as follows.

[0053] That is, one side of the + terminals of each of the three-terminal secondary batteries 32, 34, 36 is connected to each other by an electric wire E11, the other side of the + terminals of each of the three-terminal secondary batteries 32, 34, 36 is connected to each other by an electric wire E12, and the − terminals of each of the three-terminal secondary batteries 32, 34, 36 are connected to each other by an electric wire E13.

[0054] Furthermore, the electric wire E13 is connected to the + terminal of the two-terminal secondary battery 24, the - terminal of the two-terminal secondary battery 24 and the + terminal of the two-terminal secondary battery 26 are connected by an electric wire E14, and the - terminal of the two-terminal secondary battery 26 and the + terminal of the two-terminal secondary battery 28 are connected by an electric wire E15.

[0055] A power generating device 12 having a solar panel is directly connected to the negative terminal of the two-terminal secondary battery 28 and one positive terminal of each of the three-terminal secondary batteries 32, 34, 36 by electric wires E16, E11. This allows the secondary battery module 20 to be charged. A load 18 is connected to the negative terminal of the two-terminal secondary battery 28 and the other positive terminal of each of the three-terminal secondary batteries 32, 34, 36 by electric wires E17, E12. This allows the secondary battery module 20 to be discharged.

[0056] In this secondary battery module 20, three three-terminal secondary batteries 32, 34, 36 each having an electric capacity of 10 Ah (ampere-hours) are connected in parallel, so that the electric capacity is matched with each of the two-terminal secondary batteries 24, 26, 28 each having an electric capacity of 30 Ah (ampere-hours). Although not shown in the figure, three three-terminal secondary batteries 32, 34, 36 each having an electric capacity of 10 Ah (ampere-hours) connected in parallel may also be arranged at the other end of the secondary battery module 20.

[0057] Next, the operation of the secondary battery module 20 and the power storage system 10 according to the third embodiment configured as described above will be described. Note that the explanation of the operation common to the first and second embodiments will be omitted as appropriate.

[0058] In the secondary battery module 20 according to the third embodiment, in each of the three-terminal secondary batteries 32, 34, 36 connected in parallel and arranged at one end, the + terminal connected to the power generation device 12 and the + terminal connected to the load 18 are separate terminals that are independent of each other (located on opposite sides of each other). In other words, when charging and discharging are performed simultaneously (when discharging while charging), the + terminal used as the charging side (input side) and the + terminal used as the discharging side (output side) are separate.

[0059] Therefore, even if the voltage at the discharge side terminal fluctuates (drops) due to the operation of the load 18 connected to the discharge side terminal, the drop in voltage at the charge side terminal due to this can be suppressed (mitigated) as in the configuration of the secondary battery module 20 using secondary batteries of the same electrical capacity as in the first and second embodiments.

[0060] That is, since the voltage at the charging terminal can be kept higher than the voltage at the discharging terminal, the power storage system 10 including the secondary battery module 20 according to the third embodiment can also keep the voltage generated by the power generator 12 that generates power by receiving sunlight close to the maximum output voltage. Therefore, a decrease in the amount of power generated by the power generator 12 can be suppressed.

[0061] Although not shown in the figures, a plurality of two-terminal secondary batteries may be connected in parallel, and the parallel connected two-terminal secondary batteries may be connected in series with a single three-terminal secondary battery. Also, a plurality of two-terminal secondary batteries may be connected in parallel, and a plurality of three-terminal secondary batteries may be connected in parallel, and these may be connected in series.

[0062] The above describes the secondary battery module 20 (secondary battery pack 30) and the power storage system 10 according to this embodiment with reference to the drawings. However, the secondary battery module 20 (secondary battery pack 30) and the power storage system 10 according to this embodiment are not limited to those shown in the drawings, and can be modified in design as appropriate within the scope that does not deviate from the gist of the present invention.

[0063] For example, although not shown, a secondary battery pack (not shown) may be configured by connecting a plurality of secondary battery modules 20 according to the third embodiment in series, and the power storage system 10 may include the secondary battery pack. Also, in the first to third embodiments, the number of two-terminal secondary batteries is not limited to the number shown in the drawings. [Explanation of symbols]

[0064] 10. Energy storage system 12 Power generation equipment 20 Secondary battery module 22 Secondary battery 30 Secondary battery pack 32 Three-terminal secondary battery

Claims

1. A secondary battery module includes a three-terminal secondary battery having a first terminal for charging, a second terminal for discharging, and a third terminal used for at least one of charging and discharging, at at least one of one ends of a plurality of secondary batteries connected in series.

2. A secondary battery module in which a plurality of three-terminal secondary batteries, each having a first terminal for charging, a second terminal for discharging, and a third terminal used for at least one of charging and discharging, are connected in parallel, and the plurality of three-terminal secondary batteries connected in parallel are included at at least one of one ends and the other end of a plurality of secondary batteries connected in series.

3. 3. A secondary battery pack comprising a plurality of secondary battery modules according to claim 1 or 2 connected in series.

4. Power generation equipment; The secondary battery module according to claim 1 or 2, to which the power generating device is electrically connected; A power storage system equipped with

5. the power generating device generates power by receiving light, The power-storage system according to claim 4 , wherein the power generating device is directly connected to the secondary battery module.

6. Power generation equipment; The secondary battery pack according to claim 3 , wherein the power generating device is electrically connected to the secondary battery pack. A power storage system equipped with

7. the power generating device generates power by receiving light, The power-storage system according to claim 6 , wherein the power generating device is directly connected to the secondary battery pack.

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