WO2022185357A1

WO2022185357A1 - Electricity storage device, and method for manufacturing electricity storage device

Info

Publication number: WO2022185357A1
Application number: PCT/JP2021/007614
Authority: WO
Inventors: 敏夫柴田; 靖生鈴木; 昌義木村; 健志 ▲濱▼田; アナンダビターナゲ
Original assignee: 武蔵精密工業株式会社
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2022-09-09

Abstract

In the present invention, a relatively larger current is channeled while suppressing generation of heat in a re-usage battery cell to a greater extent than in a prior-art electricity storage device in which only the re-usage battery cell is used. This electricity storage device comprises a battery module including a re-used battery cell, and a re-usage connection body. The re-usage connection body has an electricity storage cell having a lower internal resistance than the battery cell, and a connection part to which an electric connection terminal of the battery module is connected, the re-usage connection body having a configuration in which the battery cell of the battery module connected to the connection part is connected in parallel to the electricity storage cell.

Description

POWER STORAGE DEVICE AND METHOD FOR MANUFACTURING POWER STORAGE DEVICE

The present invention relates to a power storage device and a method for manufacturing the power storage device.

Conventionally, techniques for reusing used batteries that have already been used have been known (see Patent Documents 1 to 5 below). By reusing used batteries, for example, it is possible to effectively use resources and reduce the price of products.

Japanese Unexamined Patent Application Publication No. 2010-232103 Patent No. 6140314 JP 2018-050457 A WO2011/162014 WO2020/044597

Second-hand batteries often deteriorate due to long-term use and have increased internal resistance. Such a power storage device that uses only used batteries as it is tends to become hot when a large current flows through the used batteries. There are disadvantages such as

An object of the present invention is to provide a power storage device that can solve the above-described problems, and a method for manufacturing the power storage device.

(1) In the power storage device disclosed in this specification, a battery module including reused battery cells, a power storage cell having a smaller internal resistance than the battery cells, and electrical connection terminals of the battery module are connected. and a connection portion, and a reuse connection body having a configuration in which the battery cells of the battery module connected to the connection portion are connected in parallel to the storage cells.

Reused battery cells (hereinafter referred to as "reused battery cells") have deteriorated and their internal resistance has increased. For this reason, a power storage device including such reused battery cells cannot cope with, for example, high-current charging/discharging, and there are disadvantages such as limited usage after reuse. On the other hand, the present power storage device has a configuration in which power storage cells are connected in parallel to reused battery cells. A storage cell has a smaller internal resistance than a battery cell. Therefore, according to the present power storage device, a relatively large amount of current can flow while suppressing heat generation of the reused battery cells, as compared with a conventional power storage device that uses only reused battery cells.

(2) In the power storage device, the power storage cells may be capacitor cells. According to this power storage device, by using a high-output capacitor cell, heat generation of the reused battery cell can be suppressed more effectively, and a relatively large current can flow.

(3) In the power storage device described above, the connection portion of the reusable connection body may be configured to be detachably connected to an electrical connection terminal of the battery module. According to this power storage device, the reuse connection body can be used by reconnecting one reuse battery module to another reuse battery module.

(4) In the above power storage device, the reuse connection body further includes a control unit that controls the conditions of use of the power storage device, and the control unit controls the deterioration state of the battery cells of the battery module during reuse. It is also possible to change the usage conditions by According to this power storage device, the battery cells of the battery module can be used under appropriate usage conditions according to the state of deterioration during reuse.

(5) In the power storage device described above, the reuse connection body further includes a communication unit that communicates with an external device, and the control unit receives the battery cells of the battery module from the external device via the communication unit. It is also possible to acquire information about the deterioration state of the reuse. According to this power storage device, it is possible to acquire information about the state of deterioration of the battery cells of the battery module during reuse by using the storage area of the external device.

(6) In the power storage device described above, the battery module includes a conducting base portion having a first arrangement surface on which the electrical connection terminals are arranged, a communication connection terminal, and a second arrangement on which the communication connection terminals are arranged. a communication base having a surface, a first aspect having the first arrangement surface of the conducting base and being parallel to the second arrangement surface of the communication base, and the conducting base and a second aspect in which the first arrangement surface of the portion is perpendicular to the second arrangement surface of the communication base portion, and the connection portion is detachable from the electrical connection terminal. a first connection portion connected to the communication connection terminal, a second connection portion detachably connected to the communication connection terminal, and a third connection portion arranged with the first connection portion and the second connection portion a connection base portion having an arrangement surface, and the first connection portion is continuous from a tip surface parallel to the third arrangement surface to a side surface perpendicular to the third arrangement surface. A configuration in which slits are formed may be employed. According to this power storage device, regardless of whether the battery module is in the first mode or the second mode, it can be connected to the connecting portion of the reuse connector.

(7) A method for manufacturing a power storage device disclosed in the present specification is a method for manufacturing a power storage device including reused battery cells, comprising: preparing a battery module including the battery cell; preparing a reusable connection body including storage cells having a smaller internal resistance than the battery cells; and connecting the battery cells of the battery module in parallel to the storage cells provided in the reusable connection body. and According to this power storage device manufacturing method, it is possible to manufacture a power storage device capable of suppressing heat generation of reused battery cells and allowing a relatively large amount of current to flow.

(8) In the method for manufacturing a power storage device, the power storage device further includes a control unit that manages the conditions of use of the battery cells of the battery module, and further prevents the battery cells of the battery module from deteriorating during reuse. The configuration may include a step of specifying a state, and a step of adjusting the use condition by the control unit according to the specified deterioration state. According to this power storage device manufacturing method, the battery cells of the battery module can be used under appropriate usage conditions according to the state of deterioration during reuse.

The technology disclosed in the present specification can be implemented in various forms. For example, it can be implemented in the form of a power storage device, a reuse connection body, a method for manufacturing the power storage device, a method for managing the power storage device, and the like. It is possible.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows roughly the structure of the electrical storage apparatus 100 in embodiment Explanatory drawing showing the connection structure between the battery module 100b and the reusable connector 100c Flowchart showing a part of the manufacturing process of the power storage device 100

A. Embodiment:
A-1. Configuration of power storage device 100:
FIG. 1 is an explanatory diagram schematically showing the configuration of a power storage device 100 according to this embodiment. The power storage device 100 is a power storage device that includes a used lithium ion battery (hereinafter referred to as “LIB 12b”) and reuses the LIB 12b. As shown in FIG. 1, the power storage device 100 includes a battery module 100b and a reuse connector 100c. LIB 12b is an example of a battery cell in the claims.

(Battery module 100b)
The battery module 100b includes a battery 10b and a battery management device 20b.

The battery 10b is a used battery, and as shown in FIG. 1, has a configuration in which one or more used LIBs 12b are connected in series. The LIB 12b is, for example, an iron phosphate-based LIB or a ternary (nickel-manganese-cobalt-based, etc.) LIB. Whether or not the battery 10b or the LIB 12b is second-hand (reused) can be determined, for example, by the difference in manufacturing date based on the lot number of the battery module 100b and the lot number of the reuse connector 100c, or the SOH (SOH) of the battery 10b or LIB 12b. It can be judged from the State of Health. The battery 10b is electrically connected via a positive terminal 42b and a negative terminal 44b to a positive input terminal 32c and a negative input terminal 34c of the reusable connector 100c, which will be described later. Note that before the battery module 100b is reused, the battery 10b is connected to a load (not shown) and an external power supply via the positive terminal 42b and the negative terminal 44b. The positive terminal 42b and the negative terminal 44b are examples of electrical connection terminals in the claims.

The battery management device 20b is a device for managing the battery module 100b including the battery 10b. The battery management device 20b includes a voltmeter 22b, an ammeter 24b, a thermometer 26b, a monitoring unit 28b, a line switch 40b, a battery control unit 70b, a battery recording unit 72b, a battery history unit 74b, a battery and an interface (I/F) section 76b.

One voltmeter 22b is provided for each LIB 12b. Each voltmeter 22b is connected in parallel to each LIB 12b, measures the voltage of each LIB 12b, and outputs a signal indicating the voltage measurement value to the monitoring unit 28b. The ammeter 24b is connected in series with the battery 10b. The ammeter 24b measures the current flowing through the battery 10b and outputs a signal indicating the current measurement value to the monitoring section 28b. Thermometer 26b is located near battery 10b. The thermometer 26b measures the temperature of the battery 10b and outputs a signal indicating the temperature measurement value to the monitoring section 28b. Based on the signals received from the voltmeter 22b, the ammeter 24b, and the thermometer 26b, the monitoring unit 28b outputs signals indicating the voltage of each LIB 12b, the current flowing through the battery 10b, and the temperature of the battery 10b to the battery control unit 70b. do.

The line switch 40b is installed between the battery 10b and the negative terminal 44b. The line switch 40b opens and closes the connection between the battery 10b and the reusable connector 100c (load and external power supply) by being on/off-controlled by the battery control unit 70b. Note that the line switch 40b is not limited to an element that cuts off the current, and may be an element that limits the current to a predetermined amount or less.

The battery control unit 70b is configured using, for example, a multi-core CPU and programmable devices (Field Programmable Gate Array (FPGA), Programmable Logic Device (PLD), etc.), and controls the operation of the battery management device 20b. The battery control unit 70b performs, for example, battery management processing for managing the battery 10b. Specifically, the battery control unit 70b makes various abnormality determinations (overvoltage abnormality, overcurrent abnormality, temperature abnormality, etc.), and on the condition that it is determined that the battery 10b is in an abnormal state, an abnormality processing is executed in response to the abnormality. The abnormal processing includes, for example, processing for notifying an abnormality of the battery 10b to the outside via the battery interface unit 76b, and processing for prohibiting charging and discharging of the battery 10b by opening the line switch 40b.

The battery storage unit 72b is composed of, for example, a ROM, a RAM, a hard disk drive (HDD), etc., stores various programs and data, and is used as a work area and a data storage area when executing various processes. do. For example, the battery recording unit 72b stores a computer program for executing the battery management process and the like for the battery module 100b alone. The computer program is provided in a state stored in a computer-readable recording medium (not shown) such as a CD-ROM, DVD-ROM, USB memory, etc., and is installed in the battery module 100b so that the battery storage unit 72b can stored in

The battery history section 74b is composed of, for example, a ROM, a RAM, a hard disk drive (HDD), etc., and records various histories related to the battery module 100b. Examples of such history include the following regarding the battery 10b (LIB 12b), which will be described later.
(1) "Battery capacity and internal resistance initial values (when new)"
(2) "Maximum current value during charging, average current value, charging time, number of cycles, maximum voltage value"
(3) "Maximum current value, average current value, discharge time, number of cycles, minimum voltage value during discharge"
(4) "Highest temperature", "High temperature time", "Lowest temperature", "Low temperature time"

The battery interface unit 76b communicates with other devices by wire or wirelessly. In this embodiment, the battery interface unit 76b is communicably connected to another device via the communication connection terminal 46b. Note that before the battery module 100b is reused, the battery control unit 70b stores the history information about the battery 10b recorded in the battery history unit 74b together with the identification information of the battery module 100b (or the battery 10b) and another device (for example, It is configured to transmit to a server device (not shown) at any time. Therefore, the history information about the battery 10b before reuse is recorded in the server device in association with the identification information of the battery module 100b (or the battery 10b). By sending the history information to the server device in this way, the storage capacity of the power storage history section 74c can be saved.

(Reuse connector 100c)
The reuse connection body 100c includes a capacitor group 10c, a power storage management device 20c, and a connection portion 30c.

The capacitor group 10c has a configuration in which one or more lithium ion capacitors (hereinafter referred to as "LIC 12c") are connected in series. The LIC 12c may be new or used. The LIC 12c is an example of a storage cell and a capacitor cell in the claims.

The capacitor group 10c is connected in parallel to the battery 10b of the battery module 100b via the plus input terminal 32c and the minus input terminal 34c of the connecting portion 30c. Hereinafter, the battery 10b and the capacitor group 10c that are connected in parallel with each other are collectively referred to as a "parallel block 10". Capacitor group 10c is also connected to a load and an external power supply via plus output terminal 52c and minus output terminal 54c. Therefore, by electrically connecting the positive terminal 42b and the negative terminal 44b of the battery module 100b to the positive input terminal 32c and the negative input terminal 34c of the reusable connection body 100c, the parallel block 10 becomes the positive output terminal 52c and the negative terminal 52c. It will be connected to a load and an external power supply via the output terminal 54c.

The power storage management device 20c is a device for managing not only the reuse connection body 100c including the capacitor group 10c, but also including the battery module 100b electrically connected to the reuse connection body 100c. The power storage management device 20c includes a voltmeter 22c, an ammeter 24c, a thermometer 26c, a monitoring unit 28c, a line switch 40c, a power storage control unit 70c, a power storage recording unit 72c, a power storage history unit 74c, and a power storage unit 74c. and an interface (I/F) section 76c.

One voltmeter 22c is provided for each LIC 12c. Each voltmeter 22c is connected in parallel to each LIC 12c, measures the voltage of each LIC 12c, and outputs a signal indicating the voltage measurement value to the monitoring unit 28c. Ammeter 24c is connected in series with capacitor group 10c. The ammeter 24c measures the current flowing through the LIC 12c and outputs a signal indicating the current measurement value to the monitoring unit 28c. In the present embodiment, the ammeter 24c is connected in series to the parallel block 10 while the battery module 100b is electrically connected to the reusable connector 100c (see FIG. 1). Therefore, in this state, the ammeter 24c measures the current flowing through the parallel block 10 and outputs a signal indicating the current measurement value to the monitoring section 28c.

The thermometer 26c is arranged near the LIC 12c. The thermometer 26c measures the temperature of the capacitor group 10c and outputs a signal indicating the temperature measurement value to the monitoring unit 28c. Based on the signals received from the voltmeter 22c, the ammeter 24c, and the thermometer 26c, the monitoring unit 28c sends a signal indicating the voltage of each LIC 12c, the current flowing through the capacitor group 10c, and the temperature of the capacitor group 10c to the power storage control unit 70c. output.

The line switch 40c is installed between the ammeter 24c and the negative output terminal 54c. The line switch 40c opens and closes the connection between the parallel block 10, the load, and the external power supply by being on/off-controlled by the power storage control unit 70c. Note that the line switch 40c is not limited to an element that cuts off the current, and may be an element that limits the current to a predetermined amount or less.

The power storage control unit 70c is configured using, for example, a multi-core CPU and a programmable device, and controls the operation of the power storage management device 20c. The power storage control unit 70c is an example of a control unit in the claims.

The power storage recording unit 72c is composed of, for example, a ROM, a RAM, a hard disk drive, etc., and stores various programs and data, and is used as a work area and a data storage area when executing various processes. For example, the electricity storage recording unit 72c stores a computer program for executing each process described later. The computer program is provided in a state stored in a computer-readable recording medium (not shown) such as a CD-ROM, DVD-ROM, USB memory, etc., and is installed in the reusable connector 100c to 72c.

The power storage history unit 74c is composed of, for example, a ROM, a RAM, a hard disk drive, etc., and records not only various histories related to the reusable connection body 100c, but also the history related to the battery 10b, which is transmitted from the battery module 100b at any time. The power storage interface unit 76c performs wired or wireless communication with other devices (external devices) (for example, the battery module 100b, a server device, etc.). In this embodiment, the power storage interface section 76c is connected to the battery interface section 76b via the communication input terminal 36c and the communication connection terminal 36b, whereby the reusable connector 100c is communicably connected to the battery module 100b. The power storage interface section 76c is an example of a communication section in the claims.

A-2. Connection structure between battery module 100b and reusable connector 100c:
FIG. 2 is an explanatory diagram showing the connection structure between the battery module 100b and the reusable connector 100c. In this embodiment, there are two types of battery modules 100b: a vertical connection type and a horizontal connection type. Both the vertical connection type battery module 100bX and the horizontal connection type battery module 100bY can be attached to and detached from the common reuse connector 100c. FIG. 2A shows the connection relationship between the vertical connection type battery module 100bX and the reuse connection body 100c, and FIG. 2B shows the horizontal connection type battery module 100bY and the reuse connection body 100c. is shown. The tandem-connection type battery module 100bX is an example of the first aspect of the claims, and the battery module 100bY is an example of the second aspect of the claims.

(Vertical connection type battery module 100bX)
As shown in FIG. 2A, the tandem-connection type battery module 100bX includes the components described above (the battery 10b, the battery control unit 70b, the monitoring unit 28b, etc.) and a housing that accommodates these components. 80X and. The housing 80X has, for example, a vertically long rectangular parallelepiped shape, and the housing 80X is provided with the above-described plus terminal 42bX, minus terminal 44bX, and communication connection terminal 46bX.

Specifically, the positive terminal 42bX and the negative terminal 44bX are provided so as to protrude downward from the lower surface 82X of the housing 80X. Each of the positive terminal 42bX and the negative terminal 44bX has a flat plate shape in the direction in which they are arranged. A communication base portion 90X is arranged between the positive terminal 42bX and the negative terminal 44bX, and the lower surface 92X of the communication base portion 90X is substantially parallel to the lower surface 82X of the housing 80X. The communication connection terminal 46bX is provided so as to protrude downward from the lower surface 92X of the communication base portion 90X. The housing 80X is an example of the conducting base portion in the scope of claims, and the lower surface 82X of the housing 80X is an example of the first arrangement surface in the scope of claims. The lower surface 92X of the communication base portion 90X is an example of a second arrangement surface in the scope of claims. On the side surface of the housing 80X, an identification information display section 84X is provided in which identification information (such as a QR code (registered trademark) or barcode) of the vertical connection type battery module 100bX is displayed.

(Horizontal connection type battery module 100bY)
As shown in FIG. 2(B), the horizontal connection type battery module 100bY includes the components described above (the battery 10b, the battery control unit 70b, the monitoring unit 28b, etc.) and a housing that accommodates these components. 80Y and. The housing 80Y has, for example, a horizontally long rectangular parallelepiped shape, and is provided with the above-described plus terminal 42bY, minus terminal 44bY, and communication connection terminal 46bY.

Specifically, the positive terminal 42bY and the negative terminal 44bY are provided so as to protrude in the horizontal direction from the side surface 82Y of the housing 80Y. Each of the positive terminal 42bY and the negative terminal 44bY has a flat plate shape in the direction in which they are arranged. A communication base portion 90Y is arranged between the positive terminal 42bY and the negative terminal 44bY, and the lower surface 92Y of the communication base portion 90Y is perpendicular to the side surface 82Y of the housing 80Y. The communication connection terminal 46bY is provided so as to protrude downward from the lower surface 92Y of the communication base portion 90Y. The housing 80Y is an example of the conducting base portion in the claims, and the side surface 82Y of the housing 80Y is an example of the first arrangement surface in the claims. The lower surface 92Y of the communication base portion 90X is an example of a second arrangement surface in the scope of claims. An identification information display portion 84Y is provided on the upper surface of the housing 80Y, in which identification information (such as a QR code (registered trademark) or a barcode) of the horizontal connection type battery module 100bY is displayed.

(Connecting portion 30c of reusable connector 100c)
The connection portion 30c of the reuse connection body 100c has a flat connection base portion 38c. A positive input terminal 32c and a negative input terminal 34c are provided on an upper surface 39c of the connection base portion 38c so as to protrude upward. A slit V is continuously formed in the positive input terminal 32c from its upper surface S1 to a pair of side faces S2 parallel to each other (a pair of side faces parallel to the direction in which the positive input terminal 32c and the negative input terminal 34c are arranged). formed. The slit V extends in a direction orthogonal to the direction in which the positive input terminal 32c and the negative input terminal 34c are arranged when viewed from above. By inserting the plus terminal 42b of the battery module 100b into the slit V of the plus input terminal 32c, the plus terminal 42b and the plus input terminal 32c are electrically connected.

Similarly, the minus input terminal 34c has a pair of side surfaces S2 parallel to each other (a pair of side surfaces parallel to the direction in which the plus input terminal 32c and the minus input terminal 34c are arranged) from its upper surface S1 (tip surface). A slit V is formed in the . The slit V extends in a direction orthogonal to the direction in which the positive input terminal 32c and the negative input terminal 34c are arranged when viewed from above. By inserting the negative terminal 44b of the battery module 100b into the slit V of the negative input terminal 34c, the negative terminal 44b and the negative input terminal 34c are electrically connected. The positive input terminal 32c and the negative input terminal 34c are an example of a first connecting portion in the scope of claims.

A communication input terminal 36c is further arranged on the upper surface 39c of the connection base portion 38c. The communication input terminal 36c is arranged between the plus input terminal 32c and the minus input terminal 34c. By inserting the communication connection terminal 46b of the battery module 100b from above into the communication input terminal 36c, the communication input terminal 36c and the communication connection terminal 46b are communicably connected. The communication input terminal 36c is an example of a second connection section in the scope of claims. The upper surface 39c of the connection base portion 38c is an example of a third arrangement surface in the claims.

With the above configuration, the connection portion 30c of the reusable connector 100c is configured such that the positive terminal 42bX, the negative terminal 44bX, and the communication connection terminal 46bX of the vertical connection type battery module 100bX are detachably connected. The connecting portion 30c of the reusable connector 100c is configured to detachably connect the positive terminal 42bY, the negative terminal 44bY, and the communication connection terminal 46bY of the horizontal connection type battery module 100bY. Thus, according to the present embodiment, regardless of whether the battery module 100b is of the vertical connection type or the horizontal connection type, it can be connected to the connection portion 30c of the reusable connector 100c. In addition, the reused battery 10b (LIB 12b) can be replaced and used on a module basis for the reuse connection body 100c. For example, the vertical connection type battery module 100bX is connected to the reusable connection body 100c for use, and after the battery 10b of the vertical connection type battery module 100bX has deteriorated to the extent that it cannot be reused, the reusable connection body 100c is connected to the horizontal connection type battery module 100bX. can be used by reconnecting the battery module 100bY.

A-3. Method for manufacturing power storage device 100:
Next, a method for manufacturing the power storage device 100 including the reused battery 10b (LIB 12b) will be described. FIG. 3 is a flowchart showing a part of the manufacturing process of power storage device 100 .

As shown in FIG. 3, for example, a worker collects the already used battery module 100b (S110). The battery module 100b is a module unit, and can be easily disassembled and collected from a device in which the battery module 100b is installed.

Next, the history information about the collected battery module 100b is obtained (S120). This history information is history information when the battery module 100b is used before this reuse. Specifically, when the identification information is read from the identification information display portion 84 (84X, 84Y) of the collected battery module 100b by a predetermined management device, the read identification information is transmitted from the management device to the server device. . Then, history information about the battery module 100b is returned from the server device to the management device. Alternatively, the recovered battery module 100b may be connected to the reuse connection body 100c, and the power storage control section 70c of the reuse connection body 100c may acquire history information regarding the battery module 100b.

Next, the deterioration of the battery 10b provided in the collected battery module 100b is determined (S130). The management device determines the deterioration state (for example, SOH) of the battery 10b based on the acquired history information. The SOH of battery 10b can be identified by a known method. Alternatively, the recovered battery module 100b may be connected to the reuse connection body 100c, and the power storage control section 70c of the reuse connection body 100c may determine the deterioration of the battery 10b.

Next, it is determined whether the collected battery module 100b (battery 10b) is reusable (S140). For example, if the SOH of the battery 10b is equal to or higher than a predetermined lower limit level, the management device determines that the battery is reusable, and if the SOH of the battery 10b is less than the predetermined lower limit level, the management device determines that the battery cannot be reused. be done. Alternatively, the recovered battery module 100b may be connected to the reuse connection body 100c, and the power storage control section 70c of the reuse connection body 100c may determine whether or not reuse is possible.

When it is determined that the battery module 100b cannot be reused (S140: NO), disposal processing of the battery module 100b is performed (S160). Note that when the power storage control unit 70c determines whether or not the battery can be reused, the power storage control unit 70c performs an operation to notify the outside that the battery cannot be reused. In this case, the process returns to S110 and another battery module 100b is collected.

On the other hand, if it is determined that the battery module 100b is reusable (S140: YES), the usage conditions of the battery module 100b (battery 10b) are changed according to the state of deterioration (S150), and the production of the power storage device 100 is completed. do. Specifically, the recovered battery module 100b is connected to the reuse connector 100c, and the power storage device 100 is activated. Then, the power storage control unit 70c takes over the history information and the deterioration determination result regarding the battery module 100b from the management device, and changes the usage condition of the battery module 100b according to the deterioration state of the battery 10b. Specifically, the power storage control unit 70c changes the above-described various abnormality determination thresholds according to the deterioration state. For example, the lower the SOH, the smaller the absolute value of the overcurrent threshold, the smaller the overvoltage threshold, and the lower the temperature abnormality threshold. As a result, the battery 10b (LIB 12b) of the battery module 100b can be used under appropriate usage conditions according to the state of deterioration during reuse.

A-4. Effect of this embodiment:
The battery 10b of the reused battery module 100b deteriorates and has a large internal resistance. For this reason, a power storage device including the reused battery 10b cannot cope with, for example, high-current charging/discharging, and there are disadvantages such as limited usage after reuse. In contrast, in the power storage device 100 of the present embodiment, the capacitor group 10c is connected in parallel to the reused battery 10b. Capacitor group 10c has a smaller internal resistance than battery 10b. Therefore, according to the present embodiment, the power storage device 100 (parallel A relatively large current can flow through block 10). Further, it is possible to suppress deterioration of the battery 10b caused by a high temperature due to a large current flowing through the battery 10b.

According to the present embodiment, by using the high-output LIC 12c, it is possible to more effectively suppress the heat generation of the reused LIB 12b and allow a relatively large current to flow through the power storage device 100.

B. Variant:
The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified in various forms without departing from the scope of the invention. For example, the following modifications are possible.

The configuration of the power storage device 100 in the above embodiment is merely an example, and various modifications are possible. For example, in the above embodiment, the LIB 12b is used as an example of a battery cell. Also, although the LIC 12c has been exemplified as the storage cell, the storage cell is not limited to this and may be a non-lithium based capacitor or a storage battery having a smaller internal resistance than a battery cell. The internal resistance of the storage cell is preferably, for example, 1 mΩ or less, or 1/2 or less of the internal resistance of the reused battery cell.

In the above embodiment, the battery 10b may have a configuration in which a plurality of LIBs 12b are connected in parallel, or a configuration including both a plurality of LIBs 12b connected in series and a plurality of LIBs 12b connected in parallel. Also, the capacitor group 10c may have a configuration in which a plurality of LICs 12c are connected in parallel, or a configuration including both a plurality of LICs 12c connected in series and a plurality of LICs 12c connected in parallel.

In the above embodiment, the power storage control unit 70c is configured to measure the current flowing through the parallel block 10 using the ammeter 24c provided in the reusable connection body 100c, but the configuration is not limited to this. For example, the ammeter 24c is connected in series to the capacitor group 10c, and the ammeter 24c and the capacitor group 10c are connected in parallel to the battery 10b. The configuration may be such that the current flowing through the battery 10c is measured, and the measurement result of the current flowing through the battery 10b is received from the battery control unit 70b.

In the above embodiment, the configuration may be such that the battery module 100b cannot be attached to and detached from the connection portion 30c of the reusable connector 100c. Further, in the above embodiment, the battery module 100b may be configured without the monitoring unit 28b, the battery management device 20b, the voltmeter 22b, and the line switch 40b. In such a configuration, the power storage management device 20c of the reuse connection body 100c monitors the state of the battery 10b (or each LIB 12b), detects the current abnormality of the parallel block 10 with the ammeter 24c, and detects the current abnormality of the parallel block 10 with the line switch 40c. 10 abnormal processing is performed.

10: parallel block 10b: battery 10c: capacitor group 12b: LIB 12c: LIC 20b: battery management device 20c: power

storage management device

22b, 22c:

voltmeter

24b, 24c:

ammeter

26b, 26c:

thermometer

28b, 28c: monitor Section 30c: Connection section 32c: Plus input terminal 34c: Negative input terminal 36c: Communication input terminal 38c:

Connection base section

40b, 40c: Line switch 42b (42bX, 42bY): Plus terminal 44b (44bX, 44bY): Negative terminal 46b (46bX, 46bY): communication connection terminal 52c: positive output terminal 54c: negative output terminal 70b: battery control section 70c: power storage control section 72b: battery recording section 72c: power storage recording section 74b: battery history section 74c: power storage history section 76b : Battery interface section 76c: Power

storage interface section

80X, 80Y: Housing 84 (84X, 84Y): Identification information display section 90X, 90Y: Communication base section 92X: Bottom surface 92Y: Bottom surface 100: Power storage device 100b (100bX, 100bY): Battery module 100c: reuse connection body

Claims

a battery module including reused battery cells;
A storage cell having an internal resistance smaller than that of the battery cell, and a connection portion to which an electrical connection terminal of the battery module is connected, wherein the battery cell of the battery module connected to the connection portion is connected to the storage battery cell. a reusable connector having a configuration that is connected in parallel to a cell;
A power storage device.
The power storage device according to claim 1,
The power storage device, wherein the power storage cells are capacitor cells.
The power storage device according to claim 1 or claim 2,
The connection portion of the reusable connection body is configured to be detachably connected to an electrical connection terminal of the battery module.
storage device.
The power storage device according to any one of claims 1 to 3,
The reuse connection body further includes a control unit that controls the usage conditions of the power storage device,
wherein the control unit changes the usage conditions according to a deterioration state of the battery cells of the battery module during reuse;
storage device.
The power storage device according to claim 4,
The reuse connector further comprises a communication unit that communicates with an external device,
The control unit acquires information about the state of deterioration of the battery cells of the battery module during reuse from the external device via the communication unit.
storage device.
The power storage device according to any one of claims 1 to 5,
The battery module includes: a conducting base portion having a first arrangement surface on which the electrical connection terminals are arranged; a communication connection terminal; a communication base portion having a second arrangement surface on which the communication connection terminals are arranged; have, and
a first aspect in which the first arrangement surface of the conducting base is parallel to the second arrangement surface of the communication base;
and a second aspect in which the first arrangement surface of the conducting base is perpendicular to the second arrangement surface of the communication base,
The connection portion includes a first connection portion to which the electrical connection terminal is detachably connected, a second connection portion to which the communication connection terminal is detachably connected, and the first connection portion and the second connection portion. a connection base portion having a third arrangement surface on which two connection portions are arranged, and the first connection portion has a tip surface parallel to the third arrangement surface, the A continuous slit is formed over the side surface perpendicular to the third placement surface,
storage device.
A method for manufacturing a power storage device comprising reused battery cells,
preparing a battery module including the battery cells;
A step of preparing a reuse connection body including a storage cell having an internal resistance smaller than that of the battery cell of the battery module;
a step of connecting the battery cells of the battery module in parallel to the storage cells provided in the reuse connection body;
A method of manufacturing a power storage device, comprising:
A method for manufacturing the power storage device according to claim 7,
The power storage device further comprises a control unit that manages conditions of use of the battery cells of the battery module,
Further, a step of identifying a deterioration state of the battery cells of the battery module during reuse;
a step of adjusting the usage condition by the control unit according to the identified deterioration state;
A method of manufacturing a power storage device, comprising: