JP6257493B2 - Electricity storage element - Google Patents

Description

  The present invention relates to a power storage element. In detail, it is related with the electrical storage element which comprises the sealed battery of nonaqueous electrolyte solution.

  Conventionally, a power storage element (triode cell) having a positive electrode, a negative electrode, and a reference electrode is known. In the energy storage device having such a configuration, it is possible to measure the positive electrode potential using the reference electrode as a reference, or to measure the negative electrode potential using the reference electrode as a reference. Thereby, since the individual states of the positive and negative electrodes can be observed from the positive electrode potential and the negative electrode potential, the single electrode capacities of each of the positive electrode and the negative electrode and SOC (State of Charge) can be grasped (see Patent Document 1). ).

JP 2001-15177 A

  In the electric storage element constituting the secondary battery described in Patent Document 1, in order to extract the potential of the reference electrode, it is necessary to prepare a terminal for the reference electrode in addition to the + terminal and the − terminal of the battery. However, for example, in a sealed battery of a nonaqueous electrolyte solution such as LiB (lithium ion battery), if a terminal for a reference electrode is provided in addition to a positive terminal and a negative terminal of the battery, moisture permeation from the terminal portion is reduced. The possibility of occurrence of electrolyte evaporation, leakage, etc. increases. In particular, since a battery for automobile use or the like may require a long life of 10 years or more, there is a concern related to sealing properties such as moisture permeation and electrolyte evaporation.

  When the power storage element does not have a reference electrode, the voltage sensor normally required for measuring the voltage in the power storage element is one voltage for measuring the terminal voltage (voltage between the + terminal and the − terminal). It is a sensor. However, in the case of a storage element having a reference electrode, it is necessary to further measure the positive electrode potential (voltage between the positive terminal and the reference electrode terminal) and the negative electrode potential (voltage between the negative terminal and the reference electrode terminal). is there. For this reason, two voltage sensors are required in addition to the voltage sensor in the case where the power storage element does not have a reference electrode. For this reason, it is necessary to enlarge the substrate of the cell management system.

  An object of the present invention is to provide a power storage element that has a long life and a configuration having a reference electrode without impairing the durability of sealing properties such as moisture permeation and electrolyte evaporation. To do.

  In order to achieve the above object, the present invention provides a case member (for example, a case 50 described later) that houses a positive electrode (for example, a positive electrode 60 described later) and a negative electrode (for example, a negative electrode 70 described later), and the interior of the case member. Sensor members (for example, a temperature sensor 21 and a voltage sensor 22 to be described later) and the case member, and are electrically connected to the sensor member and the negative electrode, or the sensor member And a power line carrier communication member (for example, a PLC slave unit 23 to be described later) electrically connected to the positive electrode.

  According to the present invention, the wiring of the sensor member, etc. for transmitting the internal information of the power storage element such as the voltage and temperature detected by the sensor member provided inside the case member to the outside of the case member and taking it out Therefore, it is possible to adopt a configuration in which a hole is not separately provided for the derivation. As a result, when the storage element constitutes a non-aqueous electrolyte sealed battery such as LiB (lithium ion battery), the durability of sealing performance with respect to moisture permeation, electrolyte evaporation, etc. Can be improved. In particular, batteries for automobiles and the like are required to have a long life, but the electricity storage element can suppress moisture permeation, electrolyte evaporation, leakage, etc., and the electricity storage element can be used for automobiles having a long life. Can be used for batteries. Moreover, the case member of the electrical storage element which does not have sensor members, such as a temperature sensor and a voltage sensor, can be used as a case member in this invention as it is.

  Further, it is preferable that a reference electrode (for example, a reference electrode 25 described later) provided inside the case member is provided, and the reference electrode, the negative electrode, and the positive electrode are electrically connected to the sensor member.

  According to the present invention, it is possible to take out information on the potentials of the negative electrode and the positive electrode from the electrode terminal using the reference electrode, and to provide a configuration in which a hole for the reference electrode is not separately provided in the case member. For this reason, durability of an electrical storage element can be improved.

  Moreover, it is preferable that the said power line conveyance communication member is electrically connected to the said negative electrode and the said positive electrode. According to this invention, the electric power of the power line carrier communication member can be supplied from the storage element itself.

  Further, the circuit includes an equalization circuit (for example, an equalization circuit described later) provided inside the case member for discharging the storage element, and the equalization circuit includes the reference electrode, the negative electrode, and the It is preferable to select two from the positive electrodes to enable electrical connection.

  According to this invention, since the potential of the reference electrode can be adjusted using the equalization circuit, the durability of the reference electrode can be improved. When the positive electrode potential or the negative electrode potential is measured by the voltage sensor using the reference electrode, a very small current flows, so that the SOC (State of Charge) of the reference electrode changes. However, since the SOC (State of Charge) of the reference electrode can be adjusted using an equalization circuit, it is possible to maintain a state in which an accurate positive / negative potential can be measured, and the durability of the reference electrode Can be improved. That is, the equalization circuit is switched according to the balance between the positive electrode potential and the negative electrode potential and the SOC (State of Charge) of the reference electrode, and the power accumulated in the reference electrode is discharged to the negative electrode, or the reference electrode is insufficient. The potential of the reference electrode can be kept normal by charging power from the positive electrode.

  In addition, since the power storage element performs communication of the cell management system of a plurality of power storage elements, it is necessary to supply the power line transport communication member with necessary power for operating the power line transport communication member. The required power may vary due to individual differences in chips and the like that constitute the power line carrier communication member of the plurality of power storage elements. Even in such a case, an equalization circuit can be electrically connected to the negative electrode and the positive electrode to suppress variation in required power in each power storage element.

  The negative electrode is configured by winding an electrode sheet for a negative electrode, the positive electrode is configured by winding an electrode sheet for a positive electrode, and the power line carrying communication member is configured by the winding. It is preferable to arrange at the center of the electrode sheet. According to the present invention, the dead space inside the power storage element can be effectively used.

  According to the present invention, it is possible to provide a storage element that has a long life and a configuration having a reference electrode without impairing the durability of hermeticity with respect to moisture permeation, electrolyte evaporation, and the like. it can.

It is front sectional drawing of the electrical storage element 1 which concerns on 1st Embodiment of this invention. 1 is a right side cross-sectional view of a storage element 1 according to a first embodiment of the present invention. 1 is a block diagram of a storage element 1 according to a first embodiment of the present invention. It is a block diagram which shows a mode that the electrical storage element 1 which concerns on 1st Embodiment of this invention is connected and used. It is a flowchart which shows the procedure of the process based on the measurement of the temperature in the electrical storage element 1 which concerns on 1st Embodiment of this invention. It is a block diagram of 1 A of electrical storage elements which concern on 2nd Embodiment of this invention. It is a flowchart which shows the procedure of the process based on the measurement of the voltage in the electrical storage element 1A which concerns on 2nd Embodiment of this invention. It is a block diagram of electrical storage element 1B which concerns on 3rd Embodiment of this invention. It is a flowchart which shows the procedure of the process based on the measurement of the voltage of each electrical storage element 1B in the electrical storage element 1B which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the electrical connection / interruption between the positive electrode 60, the reference electrode, and the negative electrode 70 in the equalization circuit 26 of the electrical storage element 1B which concerns on 3rd Embodiment of this invention. It is a flowchart which shows the procedure of the process of normalization of the voltage of the reference pole in the electrical storage element 1B which concerns on 3rd Embodiment of this invention. It is a block diagram of 1 C of electrical storage elements which concern on 4th Embodiment of this invention. It is a flowchart which shows the procedure of the process by ECU based on the measurement of the voltage of the reference pole in the electrical storage element which concerns on 5th Embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. Note that in the description of the second and subsequent embodiments, the same reference numerals as those in the first embodiment are assigned to configurations common to the first embodiment, and the description thereof is omitted.

<First Embodiment>
FIG. 1 is a front sectional view of a power storage device 1 according to the first embodiment of the present invention. FIG. 2 is a right side cross-sectional view of the electricity storage device 1 according to the first embodiment of the present invention. FIG. 3 is a block diagram of the energy storage device 1 according to the first embodiment of the present invention. FIG. 4 is a block diagram showing a state in which a plurality of power storage elements 1 according to the first embodiment of the present invention are connected and used. FIG. 5 is a flowchart showing a procedure of processing based on temperature measurement in the electricity storage device 1 according to the first embodiment of the present invention.

  As shown in FIG. 1 and FIG. 2, the electricity storage device 1 is a secondary battery that constitutes a lithium ion secondary battery and has a thin plate shape and a rectangular outer shape. For example, a plurality of power storage elements 1 are connected in parallel to form a high voltage battery. Moreover, the high voltage battery comprised in this way is used as a storage battery of an electric vehicle or a hybrid vehicle.

  As shown in FIGS. 1 and 2, the electricity storage device 1 includes an electricity storage device portion 10, an electrolyte solution (not shown), an electronic component component portion 20, a case 50 as a case member, a positive electrode 60, a negative electrode 70, A positive current collecting lead plate 61 and a negative current collecting lead plate 71 are provided.

[Storage element section]
The power storage device unit 10 includes a power storage device body 11, a positive current collector tab 15, and a negative current collector tab 17. The storage element unit 10 is formed, for example, with a length (dimension in the horizontal direction in FIG. 1) of 147 mm, a width of 80 mm (dimension in the vertical direction in FIG. 1), and a thickness (dimension in the horizontal direction in FIG. 2) of 38 mm. Is done.

  The power storage element body 11 includes a positive electrode sheet as a positive electrode sheet, a negative electrode sheet as a negative electrode sheet, and an insulating separator. Specifically, the positive electrode sheet and the negative electrode sheet are alternately stacked via an insulating separator to form a stacked body, and the stacked body is wound to configure the power storage element body 11. Moreover, the positive electrode current collection tab 15 is comprised by the laminated body of the positive electrode sheet, and the negative electrode current collection tab 17 is comprised by the laminated body of the negative electrode sheet. The positive electrode current collecting tab 15 constitutes the positive electrode 60 of the electricity storage element 1, and the negative electrode current collecting tab 17 constitutes the negative electrode 70 of the electricity storage element 1.

A positive electrode sheet is comprised including the positive electrode current collection foil which has electroconductivity, and the positive electrode active material layer each formed in both surfaces of the positive electrode current collection foil. As the positive electrode current collector foil, for example, a rectangular aluminum foil (for example, a thickness of 12 μm) is used.
The positive electrode active material layer is formed by applying a mixture of a positive electrode active material, a conductive filler, and a binder (adhesive) to the positive electrode current collector foil, excluding one end in the length direction, and then pressing the mixture. It is formed. The uncoated portion is wound to constitute the positive electrode current collecting tab 15.
For example, the length of the coated portion is 131 mm, the length of the uncoated portion is 7 mm, the thickness of the positive electrode sheet after pressing is 100 μm, and the electrode density of the positive electrode sheet is 3.8 g / cm ^3. The

A negative electrode sheet is comprised including the negative electrode current collection foil which has electroconductivity, and the negative electrode active material layer each formed in both surfaces of the negative electrode current collection foil. As the negative electrode current collector foil, for example, a rectangular copper foil (for example, a thickness of 10 μm) is used.
The negative electrode active material layer is formed by coating a mixture of a negative electrode active material and a binder (adhesive) on the negative electrode current collector foil, excluding one end side in the length direction, and then pressing. The uncoated portion is wound to constitute the negative electrode current collecting tab 17.
In the negative electrode sheet, for example, the length of the coated portion is 133 mm, the length of the uncoated portion is 7 mm, the thickness of the negative electrode sheet after pressing is 100 μm, and the electrode density of the negative electrode sheet is 1.5 g / cm ^3. Formed as follows.

  The separator electrically insulates the positive electrode sheet and the negative electrode sheet. The separator is formed of a porous body, and is impregnated with an electrolyte solution described later filled in the case 50. As the separator, for example, a polyolefin-based porous separator such as polyethylene or polypropylene, or a nonwoven fabric made of polyester fiber or aramid fiber is used. The separator is formed with a thickness of 25 μm, for example.

[Electrolyte]
An electrolytic solution (not shown) is filled in the case 50, and the electricity storage element unit 10 is immersed in the electrolytic solution. The electrolyte transports ions such as lithium ions generated by the battery reaction between both electrodes. The electrolytic solution is prepared by dissolving an electrolyte in a solvent.

  A non-aqueous solvent is used as the solvent. Examples of the non-aqueous solvent include ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), γ-butyrolactone (γ -BL), sulfolane, acetonitrile, 1,2-dimethoxyethane, 1,3-dimethoxypropane, dimethyl ether, tetrahydrofuran (THF), 2-methyltetrahydrofuran and the like. These nonaqueous solvents may be used alone or in combination of two or more.

Examples of the electrolyte include lithium perchlorate (LiClO ₄ ), lithium hexafluorophosphate (LiPF ₆ ), lithium boron tetrafluoride (LiBF ₄ ), lithium hexafluoroarsenide (LiAsF ₆ ), and trifluoromethanesulfonic acid. Lithium salts such as lithium (LiCF ₃ SO ₃ ) and bistrifluoromethylsulfonylimide lithium [LiN (CF ₃ SO ₃ ) ₂ ] are used. In addition, it is preferable that the dissolution amount with respect to the nonaqueous solvent of electrolyte is 0.2 mol / L-2 mol / L.

[Case]
As shown in FIGS. 1 and 2, the case 50 has a thin plate shape and a rectangular outer shape. The case 50 accommodates and holds the electricity storage element unit 10, and thus accommodates the electricity storage element body 11 constituted by the positive electrode sheet constituting the positive electrode 60 and the negative electrode sheet constituting the negative electrode 70. The case 50 includes a case main body 51 and a lid 53.

  The case body 51 is a thin plate-like box having an upper surface opened. The case body 51 is made of an aluminum alloy, SUS (stainless steel), resin, or the like. In particular, those made of an aluminum alloy and formed by impact molding or transfer press processing are preferably used. The case body 51 has, for example, a plate thickness of 1.0 mm, a length (horizontal dimension in FIG. 1) of 155 mm, a width (horizontal dimension in FIG. 2) of 40 mm and a height (vertical dimension in FIG. 1). (Dimension) is formed with an outer dimension of 100 mm.

The lid 53 has a predetermined thickness (for example, 2 mm) and closes the opening of the case body 51. The lid 53 is joined to the case main body 51 by, for example, laser welding.
The lid 53 is provided with an injection port (not shown) for injecting an electrolytic solution.

[Terminal]
The positive electrode 60 has a positive electrode terminal 62. The negative electrode 70 has a negative electrode terminal 72. The positive terminal 62 and the negative terminal 72 are attached to both ends of the lid 53 in the longitudinal direction. The positive terminal 62 and the negative terminal 72 are formed of a metal such as copper, nickel, aluminum, and SUS (stainless steel), or an alloy made of these metals.

  The positive electrode terminal 62 is electrically connected to the positive electrode current collecting tab 15 of the electricity storage element unit 10 via the positive electrode current collecting lead plate 61. The positive electrode current collecting lead plate 61 is formed of, for example, an aluminum alloy plate having a width of 40 mm and a thickness of 0.5 mm. Each of the positive electrode current collecting tab 15 and the positive electrode terminal 62 is electrically connected to the positive electrode current collecting lead plate 61 by, for example, ultrasonic welding.

  The negative electrode terminal 72 is electrically connected to the negative electrode current collecting tab 17 of the electricity storage element unit 10 via the negative electrode current collecting lead plate 71. The negative electrode current collector lead plate 71 is formed of, for example, a copper alloy plate having a width of 45 mm and a thickness of 0.3 mm. The negative electrode current collecting tab 17 and the negative electrode terminal 72 are electrically connected to the negative electrode current collecting lead plate 71, for example, by ultrasonic welding.

  The positive current collecting lead plate 61 and the negative current collecting lead plate 71 are inverted L-shaped lead plates having conductivity. These lead plates have a long portion connected to each current collecting tab and a short portion connected to each terminal.

  In order to ensure insulation and sealing between the positive terminal 62 and the lid 53 and between the negative terminal 72 and the lid 53, respectively, an annular resin sealing member (see FIG. Not shown).

[Electronic component components]
As shown in FIG. 3 and the like, the electronic component component unit 20 includes a temperature sensor 21 as a sensor member, a voltage sensor 22 as a sensor member, a PLC slave unit 23 as a power line carrier communication member, and an LSI 24. doing.

  The temperature sensor 21, the voltage sensor 22, the PLC slave unit 23, and the LSI 24 that constitute the electronic component constituting unit 20 are wiring printed on the base substrate and electric elements (capacitor, FET, etc.) fixed to the base substrate. The configured circuit board and the like are accommodated in a housing (not shown), so that they are not affected by the corrosion from the electrolyte outside the housing. It is sealed and held. As described above, the electronic component constituting unit 20 is wound around the central portion of the electricity storage element body 11 formed by alternately laminating and winding the electrode sheets for the negative electrode and the electrode sheet for the positive electrode. Arranged in the center of the electrode sheet. Accordingly, the temperature sensor 21 and the voltage sensor 22 as sensor members are provided inside the case 50 as a case member.

  The temperature sensor 21 is connected to a temperature detection unit 211 provided in the electronic component configuration unit 20 and is electrically connected to the LSI 24. The temperature sensor 21 is electrically connected to the positive electrode sheet constituting the positive electrode 60 and the negative electrode sheet constituting the negative electrode 70, and operates by using the electric power of the power storage element 1 to detect the temperature. I do. The temperature sensor 21 detects the temperature inside the power storage element body 11 of the power storage element unit 10 via the temperature detection unit 211, and transmits a signal corresponding to the detected temperature value to the LSI 24.

  The voltage sensor 22 is electrically connected to the positive electrode sheet and the negative electrode sheet, operates by using the electric power of the power storage element 1, and detects the voltage between the positive electrode 60 and the negative electrode 70. The voltage sensor 22 transmits a signal corresponding to the detected temperature value to the LSI 24.

  The LSI 24 (large scale integrated circuit) is electrically connected to the positive electrode sheet constituting the positive electrode 60 and the negative electrode sheet constituting the negative electrode 70, and operates using the electric power of the power storage element 1 to perform various processes. Do. Further, the LSI 24 receives signals from the temperature sensor 21 and the voltage sensor 22 and performs processing corresponding to the received signals as will be described later. Further, the LSI 24 includes a storage unit that stores a predetermined temperature value (hereinafter referred to as “predetermined temperature value”) in advance.

  The PLC slave unit 23 is built in the LSI 24. Therefore, the PLC slave unit 23 as a power line carrying communication member is electrically connected to the positive electrode sheet constituting the positive electrode 60 and the negative electrode sheet constituting the negative electrode 70 and electrically connected to the temperature sensor 21 and the voltage sensor 22. It is connected and is provided inside the case 50 as a case member.

  That is, the PLC slave unit 23 operates using the electric power of the power storage element 1 and performs data communication using PLC (power line carrier communication). PLC communication achieves signal communication by superimposing detection data of the voltage sensor 22 or the like on power and applying very small high frequency modulation to the voltage. As a result, information on the voltage sensor 22 and the like installed therein is transferred to a power line (for example, between the PLC slave unit 23 and the electrodes 16 and 15 and between the electrodes 15 and 17 and the PLC master unit 101 in FIG. 3). Is transmitted from the PLC slave unit 23 to the PLC master unit 101 through the power line. Specifically, the PLC slave unit 23 built in the LSI 24 is electrically connected to the positive electrode 60 and the negative electrode 70 as described above, and further, the positive electrode 60 and the negative electrode 70 are provided in the main body of the vehicle. In order to supply power to the PLC master device 101 and the ECU 102, the PLC master device 101 and the ECU 102 are electrically connected. Power line carrier communication is performed with the PLC master device 101 through such a conductive wire for supplying power, wiring on the substrate, and the like. The PLC master device 101 provided in the vehicle body is electrically connected to the ECU 102. Information included in the signal from the PLC slave unit 23, for example, information on the temperature detected by the temperature sensor 21 and information on the voltage detected by the voltage sensor 22 are transmitted to the PLC master unit 101, and the PLC master unit 101 To the ECU 102 as signals substantially proportional to temperature values, voltage values, and the like.

  As described above, the power storage device 1 in which the electronic component configuration unit 20 having the above-described configuration is arranged is electrically connected to form a high voltage battery. As illustrated in FIG. Since the electricity storage device 1-1 (cell 1) and the electricity storage device 1-2 (cell 2) are electrically connected to the PLC master device 101, the PLC elements of the electricity storage devices 1-1 and 1-2 are connected to each other. The machine 23 (see FIG. 3) is electrically connected to the PLC master machine 101.

  The ECU 102 shapes an input signal waveform from the PLC master 101 and various sensors, corrects the voltage level to a predetermined level, and converts an analog signal value into a digital signal value. And a processing unit (hereinafter referred to as “CPU”). In addition, the ECU 102 includes a storage circuit that stores various arithmetic programs executed by the CPU, various maps, and the like, and an output circuit that outputs a control signal.

The processing based on the temperature measurement in the electricity storage device 1 having the above configuration is as follows.
First, as shown in FIG. 5, in S <b> 11, the temperature sensor 21 detects the temperature inside the power storage element body 11 of the power storage element unit 10 via the temperature detection unit 211. Then, the temperature sensor 21 transmits a signal corresponding to the detected temperature value to the LSI 24.

  In S12, the LSI 24 determines whether or not the temperature value detected by the temperature sensor 21 (hereinafter referred to as “detected temperature value”) exceeds a predetermined temperature value stored in the storage unit of the LSI 24. I do. If the LSI 24 determines that the detected temperature value exceeds the predetermined temperature value, the processing by the LSI 24 proceeds to S13. If the LSI 24 determines that the detected temperature value does not exceed the predetermined temperature value, the processing by the LSI 24 returns to S11.

  In S <b> 13, the LSI 24 performs a process of transmitting a use restriction flag for performing control in which the ECU 102 restricts use of the power of the power storage element 1. The use restriction flag is converted into a signal suitable for data transfer in the power line carrier communication in the PLC slave unit 23, transmitted from the PLC slave unit 23 to the PLC master unit 101, and recognizable by the ECU 102 in the PLC master unit 101. It is converted into a signal and transmitted to the ECU 102.

  In S14, the ECU 102 controls the control signal from the output circuit of the ECU 102 so as to limit the use of the electric power stored in the electric storage element 1 that has detected the temperature by receiving the use restriction flag. Output.

According to this embodiment, the following effects are produced.
In the present embodiment, the power storage device 1 includes a case 50 as a case member that accommodates the positive electrode 60 and the negative electrode 70, a temperature sensor 21 and a voltage sensor 22 as sensor members provided inside the case 50, Provided inside, electrically connected to the temperature sensor 21 and the voltage sensor 22 and a negative electrode terminal 72 as the negative electrode 70, and electrically connected to the temperature sensor 21 and the voltage sensor 22 and the positive electrode terminal 62 as the positive electrode 60. A PLC slave unit as a power line carrier communication member.

  Thereby, the derivation of the wiring of the sensor member and the like for transmitting the internal information of the electricity storage element 1 such as the voltage and temperature detected by the sensor member provided inside the case member to the outside of the case member and taking it out Therefore, it is possible to adopt a configuration in which no holes are separately provided. As a result, when the electricity storage device 1 constitutes a nonaqueous electrolyte sealed battery such as LiB (lithium ion battery), for example, the moisture permeation in the electricity storage device 1 and the hermeticity for electrolyte evaporation, etc. The durability of can be improved. In particular, batteries for automobile applications and the like are required to have a long life. The electricity storage device 1 according to the present embodiment can suppress moisture permeation, electrolyte evaporation, liquid leakage, and the like, and the electricity storage device 1 according to this embodiment can be used for a battery for automobiles having a long life. Moreover, the case 50 of the electrical storage element 1 which does not have sensor members, such as the temperature sensor 21 and the voltage sensor 22, can be used as it is as the case 50 in this embodiment.

  In the present embodiment, the negative electrode 70 is configured by winding a negative electrode sheet, and the positive electrode 60 is configured by winding a positive electrode sheet. The PLC slave unit as the power line carrier communication member is disposed at the center of the electricity storage element body 11 constituted by the wound electrode sheet. Thereby, the dead space inside the electricity storage device 1 can be effectively used.

  In the present embodiment, the PLC slave unit 23 serving as a power line carrier communication member is electrically connected to the negative electrode 70 and the positive electrode 60. Thereby, the electric power of the PLC circuit as a power line carrier communication member can be supplied from the electric storage element 1 itself having the PLC circuit.

Second Embodiment
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The electricity storage device 1A according to the present embodiment is different from the first embodiment in that a reference electrode 25 is provided.
FIG. 6 is a block diagram of a power storage device 1A according to the second embodiment of the present invention. FIG. 7 is a flowchart showing a procedure of processing based on voltage measurement in the electric storage element 1A according to the second embodiment of the present invention.

  As the reference electrode 25, lithium metal, a lithium alloy, platinum, gold, a carbon material, a metal oxide such as LTO (lithium titanate), or the like can be used. In the present embodiment, LTO is used as the reference electrode 25. The reference electrode 25 is fixed to a housing (not shown) that constitutes the outline of the electronic component component 20, and is electrically connected to the voltage sensor 22. Therefore, the voltage sensor 22 as the sensor member is electrically connected to the positive electrode sheet constituting the positive electrode 60, the negative electrode sheet constituting the negative electrode 70, and the reference electrode 25.

  In addition, a storage unit (not shown) of the LSI 24 stores values of the predetermined voltage (1), the predetermined voltage (2), and the predetermined voltage (3) in advance.

The processing based on the voltage measurement in the power storage element 1A having the above configuration is as follows.
First, as shown in FIG. 7, in S <b> 21, the voltage sensor 22 causes the voltage between the reference electrode 25 and the negative electrode 70 (hereinafter referred to as “voltage (1)”) and between the reference electrode 25 and the positive electrode 60. And a voltage between the positive electrode 60 and the negative electrode 70 (hereinafter referred to as “voltage (3)”) are detected. The voltage sensor 22 transmits a signal corresponding to each value of the detected voltage (1), voltage (2), and voltage (3) to the LSI 24.

  In S22, the LSI 24 determines whether or not the value of the voltage (1) exceeds the value of the predetermined voltage (1), and the value of the voltage (2) exceeds the value of the predetermined voltage (2). And whether or not the value of the voltage (3) exceeds the value of the predetermined voltage (3). If an excess is found in at least one of these three determinations, that is, if the determination in S22 is YES, the processing by the LSI 24 proceeds to S23. If no excess is recognized in these three determinations, that is, if the determination in S22 is NO, the processing by the LSI 24 returns to S21.

  In S <b> 23, the LSI 24 performs a process of transmitting a use restriction flag for performing control in which the ECU 102 restricts the use of the electric power of the power storage element 1. The use restriction flag is converted into a signal suitable for data transfer in the power line carrier communication in the PLC slave unit 23, transmitted from the PLC slave unit 23 to the PLC master unit 101, and recognizable by the ECU 102 in the PLC master unit 101. It is converted into a signal and transmitted to the ECU 102.

  In S24, the ECU 102 receives the use restriction flag so as to restrict the use of the electric power stored in the electric storage element 1 that has detected the voltage (1), the voltage (2), and the voltage (3). The control signal from the output circuit of the ECU 102 is controlled and output.

According to this embodiment, the following effects are produced.
In the present embodiment, the storage element 1A includes a reference electrode 25 provided inside a case 50 as a case member, and the reference electrode 25, the negative electrode 70, and the positive electrode 60 are electrically connected to the voltage sensor 22 as a sensor member. Has been. Thereby, the information regarding the electric potential of each of the negative electrode 70 and the positive electrode 60 can be taken out from the electrodes 60 and 70 using the reference electrode 25, and the hole for the reference electrode 25 is not provided in the case 50 separately. Can do. For this reason, durability of 1 A of electrical storage elements can be improved.

  Further, in the power storage device 1A having the reference electrode 25, the single voltage sensor 22 allows the positive electrode potential (voltage between the positive terminal and the reference electrode 25) and the negative electrode potential (voltage between the negative terminal and the reference electrode 25). And can be measured. For this reason, it can suppress that the board | substrate of a cell management system becomes large.

<Third Embodiment>
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. In the following, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The electricity storage device 1B according to the present embodiment is different from the first embodiment in that an equalization circuit 26 is provided.
FIG. 8 is a block diagram of a power storage device 1B according to the third embodiment of the present invention. FIG. 9 is a flowchart showing a procedure of processing based on measurement of the voltage of each storage element 1B in the storage element 1B according to the third embodiment of the present invention. FIG. 10 is a schematic diagram showing electrical connection / disconnection between the positive electrode 60, the reference electrode, and the negative electrode 70 in the equalization circuit 26 of the electricity storage device 1B according to the third embodiment of the present invention. FIG. 11 is a flowchart showing a procedure for normalizing the voltage of the reference electrode in the electric storage device 1B according to the third embodiment of the present invention.

  As shown in FIG. 8, the equalizing circuit 26 is provided in a housing (not shown) of the electronic component component 20. Therefore, the equalization circuit 26 is provided inside the case 50 as a case member. As shown in FIG. 10, the equalizing circuit 26 includes a resistor (balancer) 261 as a discharge resistor and switches 262, 263, and 264. The switches 262, 263, and 264 operate under the control of the LSI 24, and the switch 262 switches between electrical connection / disconnection between the resistor 261 and the positive electrode 60. The switch 263 switches between electrical connection / disconnection between the resistor 261 and the reference electrode 25. Switching between electrical connection / cutoff of the switch 264, the resistor 261 and the negative electrode 70 is performed. That is, the resistor 261 of the equalization circuit 26 is electrically connected to two selected from the reference electrode 25, the negative electrode 70, and the positive electrode 60. When an electrode is connected to the resistor 261, the electrode is charged and discharged.

  The storage unit (not shown) of the LSI 24 includes a predetermined reference voltage (1), a predetermined reference voltage (2), a predetermined reference electrode voltage (1), and a predetermined reference electrode voltage (2). Each value is stored in advance. Further, a storage circuit (not shown) of the ECU 102 sets each value of a predetermined value (hereinafter referred to as a “voltage difference predetermined value”) of a difference between the voltage of one power storage element 1B and the voltage of the other power storage element 1B. , Stored in advance.

The process based on the measurement of the voltage of each power storage element 1B of the plurality of power storage elements 1B in power storage element 1B having the above configuration is as follows.
First, as shown in FIG. 9, in S31, in one power storage element 1B, the voltage sensor 22 of one power storage element 1B causes the voltage of one power storage element 1B, that is, the positive electrode 60 and the negative electrode of one power storage element 1B. The voltage between 70 is measured. The voltage sensor 22 of one power storage element 1B transmits the voltage value of one power storage element 1B to the LSI 24 of one power storage element 1B. The LSI 24 of one power storage element 1B transmits a signal based on the voltage value of the one power storage element 1B to the ECU 102 via the PLC slave unit 23 and the PLC master unit 101 of the one power storage element 1B.

  Similarly, in the other power storage element 1B, the voltage sensor 22 of the other power storage element 1B measures the voltage of the other power storage element 1B, that is, the voltage between the positive electrode 60 and the negative electrode 70 of the other power storage element 1B. . The voltage sensor 22 of the other power storage element 1B transmits the voltage value of the other power storage element 1B to the LSI 24 of the other power storage element 1B. The LSI 24 transmits a signal based on the voltage value of the other power storage element 1B to the ECU 102 via the PLC slave unit 23 and the PLC master unit 101 of the other power storage element 1B.

  In S32, the ECU 102 calculates the difference between the voltage of one power storage element 1B and the voltage of the other power storage element 1B. Then, it is determined whether or not the difference value exceeds a predetermined voltage difference value. If the difference value exceeds the voltage difference predetermined value, that is, if the determination in S32 is YES, the processing by the LSI 24 proceeds to S33. If the difference value does not exceed the voltage difference predetermined value, that is, if the determination in S32 is NO, the processing by the LSI 24 returns to S31.

  In S33, the LSI 24 turns on the switch 262 and the switch 264 (resisting to the positive electrode 60 and the negative electrode 70) with respect to the LSI 24 of the power storage device 1B having a high voltage value among the one power storage device 1B and the other power storage device 1B. 261 is electrically connected). Thereby, discharge is performed in power storage element 1B having a high voltage value. During the discharge, for example, the voltage sensor 22 detects the voltage between the positive electrode 60 and the negative electrode 70 of the power storage element 1B having a high voltage value, and the positive electrode 60 of the power storage element 1B having a low voltage is detected. When the LSI 24 detects that the voltage is the same as the voltage between the negative electrode 70 and the LSI 24, the switch 262 and the switch 264 are turned off (the resistor 261 is not electrically connected to the positive electrode 60 and the negative electrode 70 and cut off). ).

In addition, the process for normalizing the voltage of the reference electrode 25 in the LSI 24 of the power storage device 1B is as follows.
First, as shown in FIG. 11, in S <b> 41, the voltage sensor 22 causes the voltage between the reference electrode 25 and the negative electrode 70 (hereinafter referred to as “reference electrode negative voltage (1)”), the reference electrode 25, and the positive electrode 60. (Hereinafter referred to as “reference electrode positive electrode voltage (2)”). The voltage sensor 22 transmits to the LSI 24 signals corresponding to the detected values of the reference electrode negative voltage (1) and the reference electrode positive voltage (2).

  In S42, the LSI 24 determines whether or not the value of the reference electrode negative voltage (1) exceeds the value of the predetermined reference voltage (1), and the value of the reference electrode positive voltage (2) is the predetermined reference voltage. It is determined whether or not the value of (2) is exceeded. If an excess is found in at least one of these two determinations, that is, if the determination in S42 is YES, the processing by the LSI 24 proceeds to S43. If the excess is not recognized in these two determinations, that is, if the determination in S42 is NO, the processing by the LSI 24 returns to S41.

  In S43, the LSI 24 determines whether or not the excess is recognized in S42 is the reference electrode positive electrode voltage (2). If it is the reference electrode positive voltage (2) that is found to be exceeded in S42, that is, if the determination in S43 is YES, the processing by the LSI 24 proceeds to S44. If it is the reference electrode negative electrode voltage (1) that is found to be exceeded in S42, that is, if the determination in S43 is NO, the processing by the LSI 24 proceeds to S45.

  In S <b> 44, the LSI 24 performs control so that the switch 263 and the switch 264 are turned on (a state where the resistor 261 is electrically connected to the reference electrode 25 and the negative electrode 70). As a result, the excessive power accumulated in the reference electrode 25 is discharged to the negative electrode 70. During the discharge, for example, the voltage sensor 22 detects the voltage between the reference electrode 25 and the positive electrode 60. When the LSI 24 detects that the voltage between the reference electrode 25 and the positive electrode 60 has become equal to or lower than a predetermined reference electrode positive electrode voltage (2), the LSI 24 turns off the switch 263 and the switch 264 (reference electrode 25 and negative electrode 70). And the resistor 261 is not electrically connected and is cut off). As a result, the potential of the reference electrode 25 is set to a normal value.

  In S45, the LSI 24 performs control so that the switch 262 and the switch 263 are turned on (a state where the resistor 261 is electrically connected to the reference electrode 25 and the positive electrode 60). As a result, the reference electrode 25 is charged with power from the positive electrode 60. While charging is performed, for example, the voltage sensor 22 detects the voltage between the reference electrode 25 and the negative electrode 70. When the LSI 24 detects that the voltage between the reference electrode 25 and the negative electrode 70 has become equal to or lower than a predetermined reference electrode negative electrode voltage (1), the LSI 24 turns off the switch 262 and the switch 263 (reference electrode 25 and positive electrode 60). And the resistor 261 is not electrically connected and is cut off). As a result, the potential of the reference electrode 25 is set to a normal value.

According to this embodiment, the following effects are produced.
In the present embodiment, the power storage element 1B includes an equalization circuit 26 provided inside the case 50 as a case member for discharging the power storage element 1B. The equalization circuit 26 includes the reference electrode 25, the negative electrode 70, And two are selected from the positive electrodes 60, and electrical connection is enabled.

  Thereby, since the potential of the reference electrode 25 can be adjusted using the equalization circuit 26, the durability of the reference electrode 25 can be improved. When the potential of the positive electrode 60 or the potential of the negative electrode 70 is measured by the voltage sensor 22 using the reference electrode 25, a minute current flows, so that the SOC (State of Charge) of the reference electrode 25 changes. . However, since the SOC (State of Charge) of the reference electrode 25 can be adjusted using the equalization circuit 26, a state in which an accurate positive / negative potential can be measured can be maintained. The durability of can be improved. That is, the equalization circuit 26 is switched according to the balance between the positive electrode potential and the negative electrode potential and the SOC (State of Charge) of the reference electrode 25, so that excessive power accumulated in the reference electrode 25 is discharged to the negative electrode 70, or The potential of the reference electrode 25 can be kept normal by charging the insufficient power from the positive electrode 60.

  In addition, the storage element 1B needs to supply the PLC slave unit 23 with necessary power for operating the PLC slave unit 23 in order to perform communication of the cell management system of the plurality of storage element 1B. The required power may vary due to individual differences in chips and the like that constitute the PLC slave unit 23 of the plurality of power storage elements 1B. Even in such a case, the equalization circuit 26 can be electrically connected to the negative electrode 70 and the positive electrode 60 to suppress variation in required power in each power storage element 1B.

<Fourth embodiment>
Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. In the following, the same components as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The ECU 102C according to the present embodiment is different from the third embodiment in that a PLC master device 101C is incorporated.
FIG. 12 is a block diagram of a power storage device 1C according to the fourth embodiment of the present invention.

  The PLC master device 101C is not configured separately from the ECU 102C and is built in the ECU 102C. For this reason, the electric power for driving the PLC master device 101C is constituted by a part of the electric power supplied to the ECU 102C.

<Fifth Embodiment>
Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. In the following description, the same components as those in the second to fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In the present embodiment, the third embodiment is different in that various determinations made by the LSI 24 in the second to fourth embodiments are performed by the ECU according to the present embodiment without performing the LSI 24 according to the present embodiment. Is different.
FIG. 13 is a flowchart showing a procedure of processing by the ECU based on measurement of the voltage of the reference electrode in the energy storage device according to the fifth embodiment of the present invention.

  A storage unit (not shown) of the LSI does not previously store values of the predetermined voltage (1), the predetermined voltage (2), and the predetermined voltage (3). Instead of the LSI 24, the storage circuit of the ECU 102 stores values of the predetermined voltage (1), the predetermined voltage (2), and the predetermined voltage (3) in advance.

The processing based on the detection of the voltage from the voltage sensor 22 in the LSI 24 of the electricity storage device having the above configuration is as follows.
First, in S51, the voltage sensor 22 detects a voltage between the reference electrode 25 and the negative electrode 70 (hereinafter referred to as “voltage (1)”) and a voltage between the reference electrode 25 and the positive electrode 60 (hereinafter referred to as “voltage ( 2) ”and a voltage between the positive electrode 60 and the negative electrode 70 (hereinafter referred to as“ voltage (3) ”). The voltage sensor 22 transmits a signal corresponding to each value of the detected voltage (1), voltage (2), and voltage (3) to the LSI 24.

  In S <b> 52, the LSI 24 performs control to transmit information on the detected values of the voltage (1), voltage (2), and voltage (3) from the PLC slave unit 23 to the PLC master unit 101. To do.

  In S <b> 53, the PLC master device 101 sends signals corresponding to the information on the detected voltage (1), voltage (2), and voltage (3) values from the PLC slave device 23 from the PLC master device 101. It transmits to ECU102.

  In S54, the ECU 102 determines whether or not the value of the voltage (1) exceeds the value of the predetermined voltage (1), and the value of the voltage (2) exceeds the value of the predetermined voltage (2). And whether or not the value of the voltage (3) exceeds the value of the predetermined voltage (3). When an excess is recognized in at least one of these three determinations, that is, when the determination in S54 is YES, the processing by the ECU 102 proceeds to S55. If no excess is recognized in these three determinations, that is, if the determination in S54 is NO, the processing by the ECU 102 returns to S51.

  In S55, the ECU 102 sends a control signal from the output circuit of the ECU 102 so as to limit the use of the electric power stored in the electric storage element that has detected the voltage (1), the voltage (2), and the voltage (3). Control and output.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the present embodiment, the PLC slave unit 23 as a power line carrier communication member is electrically connected to the positive electrode sheet constituting the positive electrode 60 and the negative electrode sheet constituting the negative electrode 70, as well as the temperature sensor 21 and the voltage sensor. However, the present invention is not limited to this configuration. For example, if power can be supplied to the power line carrying communication member from other than the power storage element, the power line carrying communication member is electrically connected to the sensor member such as the temperature sensor 21 and the voltage sensor 22 and the negative electrode 70. Or what is necessary is just to be electrically connected to sensor members, such as the temperature sensor 21 and the voltage sensor 22, and the positive electrode 60. FIG.

  Moreover, in this embodiment, although the PLC subunit | mobile_unit transmitted the information about the value of a voltage and the value of a temperature to the PLC main unit, it is not limited to this. For example, an SOC-OCV characteristic curve or the like may be transmitted as the battery state information.

  In addition, the shape, configuration, dimensions, and the like of each part of the power storage element are not limited to the shape, configuration, dimensions, and the like of each part of the power storage element of this embodiment.

DESCRIPTION OF SYMBOLS 1 ... Power storage element 21 ... Temperature sensor (sensor member)
22 ... Voltage sensor (sensor member)
23 ... PLC cordless handset (power line carrier communication member)
25 ... Reference electrode 26 ... Equivalent circuit 50 ... Case (case member)
60 ... Positive electrode 70 ... Negative electrode 70 ... Negative electrode

Claims (3)

A case member for housing the positive electrode and the negative electrode;
A sensor member provided inside the case member;
A power line carrier communication member provided inside the case member and electrically connected to the sensor member and the negative electrode, or electrically connected to the sensor member and the positive electrode;
A reference electrode provided inside the case member;
An equalization circuit provided inside the case member for discharging the storage element ,
The reference electrode, the negative electrode, and the positive electrode are electrically connected to the sensor member,
Said equalization circuit, said reference electrode, said negative electrode, and the you allow the selected electrical connection of two from the positive electrode storage element.   The power storage device according to claim 1, wherein the power line carrying communication member is electrically connected to the negative electrode and the positive electrode. The negative electrode is configured by winding a negative electrode sheet.
The positive electrode is configured by winding a positive electrode sheet.
The power line communication member, the electric storage device according to claim 1 or claim 2 is disposed in the center of the wound electrodes sheets.

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