JP2020198722A - Monitoring unit, power storage device, and start method of monitoring unit - Google Patents

Abstract

To activate a monitoring device to monitor a power storage element when a current exceeding a threshold value flows through the power storage element.SOLUTION: A monitoring unit 110 of a power storage element 62 includes a first current measuring unit 55 that measures a current of the power storage element 62, a second current measuring unit 140 that measures a current of the power storage element 62, and a monitoring device 130. The first current measuring unit 55 has a current measuring range F1 capable of detecting an overcurrent, and a current measuring range F2 of the second current measuring unit 140 is narrower than the current measuring range F1 of the first current measuring unit 55, and when the second current measuring unit 140 detects a current of a threshold Ix or more during hibernation, the monitoring device 130 is activated, and monitors a state of the power storage element 62 on the basis of the measured value of the first current measuring unit 55.SELECTED DRAWING: Figure 5

Description

The present invention relates to a power storage device.

The power storage device has a monitoring device that monitors the state of the power storage element. The following Patent Document 1 describes that when the engine is stopped, the monitoring device is switched to the sleep mode to temporarily stop the monitoring of the power storage element in order to suppress the power consumption.

JP-A-2017-216879

If the power storage element charges and discharges a current exceeding the threshold value while the monitoring device is inactive, the state of the power storage element becomes uncertain, so it is preferable to restart monitoring.
The purpose is to activate the monitoring device to monitor the power storage element when a current exceeding the threshold value flows through the power storage element.

The monitoring unit of the power storage element includes a first current measuring unit that measures the current of the power storage element, a second current measuring unit that measures the current of the power storage element, and a monitoring device, and the first current measuring unit. Has a current measurement range capable of detecting an overcurrent, the current measurement range of the second current measurement unit is narrower than the current measurement range of the first current measurement unit, and the monitoring device measures the second current. When the unit detects a current equal to or greater than the threshold value during hibernation, it starts up and monitors the state of the power storage element based on the measured value of the first current measuring unit.

This technology can be applied to a method of starting a power storage device and a monitoring unit.

When a current exceeding the threshold value flows through the power storage element, the monitoring device can be activated to monitor the power storage element.

Disassembled perspective view of the battery Top view of secondary battery Cross-sectional view taken along the line AA of FIG. Side view of a motorcycle Battery block diagram Block diagram of the second current measurement unit Cross section of circuit board The figure which shows the current measurement range of the 1st current measurement part and the 2nd current measurement part SOC-OCV characteristics of secondary batteries Monitoring mode timing chart Flowchart of startup process

The monitoring unit of the power storage element includes a first current measuring unit that measures the current of the power storage element, a second current measuring unit that measures the current of the power storage element, and a monitoring device, and the first current measuring unit. Has a current measurement range capable of detecting an overcurrent, the current measurement range of the second current measurement unit is narrower than the current measurement range of the first current measurement unit, and the monitoring device measures the second current. When the unit detects a current equal to or greater than the threshold value during hibernation, it starts up and monitors the state of the power storage element based on the measured value of the first current measuring unit.

Since the first current measurement unit can detect overcurrent, it has a wide current measurement range and is not suitable for detecting small currents. Even if you want to start the monitoring device with current detection as a trigger, current detection May be difficult.

The current measurement range of the second current measurement unit is narrower than the current measurement range of the first current measurement unit, and it is possible to detect a small current that is difficult to detect by the first current measurement unit. By having the second current measuring unit, the first current measuring unit can start the monitoring device from hibernation and monitor the state of the power storage element by using the detection of a small current that is difficult to detect as a trigger.

The second current measuring unit may have a magnetic current sensor. The magnetic current sensor detects the current based on the magnitude of the magnetic field. Since the magnetic current sensor is non-contact, it generates less heat during charging and discharging. Since failures are unlikely to occur, it is possible to prevent malfunction of the monitoring device from starting. Moreover, since it is non-contact, the degree of freedom of arrangement with respect to the circuit board is high.

The second current measuring unit is a start sensor that detects a current equal to or greater than the threshold value flowing through the power storage element and outputs a start signal, and the monitoring device is started in response to the start signal to store the power. The state of the element may be monitored. When starting up, the monitoring device only needs to confirm the presence or absence of the start-up signal, and does not need to perform processing such as determining the level of the current value.

The activation sensor may include a current sensor and a comparator that compares the current measurement value of the current sensor with the threshold value and outputs the activation signal. The current sensor requires a current measurement accuracy that can determine whether the current is higher or lower than the threshold value. Therefore, high-precision current measurement is not required, and an inexpensive sensor can be used, which has a cost merit.

<Embodiment 1>
1. 1. Structural Description of Battery 50 As shown in FIG. 1, the battery 50 includes an assembled battery 60, a control board 65, and an accommodating body 71.

The housing body 71 includes a main body 73 made of a synthetic resin material and a lid body 74. The main body 73 has a bottomed tubular shape. The main body 73 includes a bottom surface portion 75 and four side surface portions 76. An upper opening 77 is formed at the upper end portion by the four side surface portions 76.

The accommodating body 71 accommodates the assembled battery 60 and the control board 65. The assembled battery 60 has 12 secondary batteries 62. The 12 secondary batteries 62 are connected in 3 parallels and 4 in series. The control board 65 includes a circuit board 100 and electronic components mounted on the circuit board 100, and is arranged above the assembled battery 60. The monitoring unit 110, which will be described later, is a part of the control board 65.

The lid 74 closes the upper opening 77 of the main body 73. An outer peripheral wall 78 is provided around the lid body 74. The lid body 74 has a protrusion 79 having a substantially T-shaped plan view. The first external terminal 51 of the positive electrode is fixed to one corner of the front portion of the lid 74, and the second external terminal 52 of the negative electrode is fixed to the other corner.

As shown in FIGS. 2 and 3, the secondary battery 62 is a rectangular parallelepiped case 82 in which an electrode body 83 is housed together with a non-aqueous electrolyte. The secondary battery 62 is, for example, a lithium ion secondary battery. The case 82 has a case body 84 and a lid 85 that closes an opening above the case body 84.

Although not shown in detail, the electrode body 83 is porous between the negative electrode element in which the active material is applied to the base material made of copper foil and the positive electrode element in which the active material is applied to the base material made of aluminum foil. A separator made of a resin film is arranged. All of these are band-shaped, and are wound flat so that they can be accommodated in the case body 84 with the negative electrode element and the positive electrode element shifted to the opposite sides in the width direction with respect to the separator. ..

The positive electrode terminal 87 is connected to the positive electrode element via the positive electrode current collector 86, and the negative electrode terminal 89 is connected to the negative electrode element via the negative electrode current collector 88. The positive electrode current collector 86 and the negative electrode current collector 88 include a flat plate-shaped pedestal portion 90 and leg portions 91 extending from the pedestal portion 90. A through hole is formed in the pedestal portion 90. The leg 91 is connected to a positive electrode element or a negative electrode element. The positive electrode terminal 87 and the negative electrode terminal 89 include a terminal body portion 92 and a shaft portion 93 protruding downward from the center portion of the lower surface thereof. Among them, the terminal body portion 92 and the shaft portion 93 of the positive electrode terminal 87 are integrally molded with aluminum (single material). In the negative electrode terminal 89, the terminal body portion 92 is made of aluminum and the shaft portion 93 is made of copper, and these are assembled. The terminal body 92 of the positive electrode terminal 87 and the negative electrode terminal 89 is arranged at both ends of the lid 85 via a gasket 94 made of an insulating material, and is exposed to the outside from the gasket 94.

The lid 85 has a pressure release valve 95. As shown in FIG. 2, the pressure release valve 95 is located between the positive electrode terminal 87 and the negative electrode terminal 89. When the internal pressure of the case 82 exceeds the limit value, the pressure release valve 95 opens to reduce the internal pressure of the case 82.

As shown in FIG. 4, the battery 50 can be mounted on the motorcycle 10 and used. The battery 50 may be used for starting the engine 20 which is the driving device of the motorcycle 10.

2. 2. Electrical Configuration of Battery 50 FIG. 5 is a block diagram of battery 50. The battery 50 includes an assembled battery 60, a first current measuring unit 55, a current interrupting device 53, a signal processing circuit 58, a second current measuring unit 140, a voltage measuring unit 120, a monitoring device 130, and an assembled battery. A temperature sensor (not shown) for detecting the temperature of 60 is provided.

The assembled battery 60 is composed of a plurality of secondary batteries 62. There are twelve secondary batteries 62, which are connected in three parallels and four in series. In FIG. 5, three secondary batteries 62 connected in parallel are represented by one battery symbol. The secondary battery 62 is an example of a “storage element”. The battery 50 is rated at 12V.

The assembled battery 60, the current cutoff device 53, and the first current measuring unit 55 are connected in series via the power line 70P and the power line 70N. The power line 70P and the power line 70N are examples of current paths.

The power line 70P is a power line that connects the first external terminal 51 and the positive electrode of the assembled battery 60. The power line 70N is a power line that connects the second external terminal 52 and the negative electrode of the assembled battery 60.

The current cutoff device 53 and the first current measuring unit 55 are located on the negative electrode of the assembled battery 60, and are provided on the power line 70N on the negative electrode side.

The current cutoff device 53 may be a contact switch (mechanical type) such as a relay or a semiconductor switch such as an FET or a transistor. The current cutoff device 53 is normally controlled to be closed. At the time of abnormality, the current I can be cut off by opening the current cutoff device 53.

The first current measuring unit 55 may be a shunt resistor. A shunt resistor is a resistor made of a metal plate. The shunt resistor includes a pair of electrodes 57A, an electrode 57B, and a resistor 56.

The resistor 56 is an alloy having a small temperature change rate of electrical resistance (for example, an alloy of copper, manganese, and nickel: manganin). The electrodes 57A and 57B are metals such as copper. The pair of electrodes 57A and 57B are located on both sides of the resistor 56 and are joined to the resistor 56 by welding.

The first current measuring unit 55 generates a voltage proportional to the current I of the battery 50. The signal processing circuit 58 is connected to both ends of the first current measuring unit 55 via a signal line.

The signal processing circuit 58 converts the voltage Vr across the first current measuring unit 55 into a digital value and outputs it to the monitoring device 130. The monitoring device 130 can acquire the current I from the input voltage value Vr.

The voltage measuring unit 120 can detect the battery voltage V of the four secondary batteries 62, the secondary battery 62, the secondary battery 62, and the secondary battery 62, and the total voltage of the assembled battery 60. The total voltage of the assembled battery 60 is the total voltage of the four secondary batteries 62.

As shown in FIG. 6, the second current measuring unit 140 includes a current sensor 141 and a comparator 145. The current sensor 141 may be of a magnetic type. The current sensor 141 outputs a detection signal proportional to the magnitude of the magnetic flux generated by the current I. The comparator 145 compares the threshold voltage with the detection voltage of the current sensor 141, and outputs a start signal Sa to the monitoring device 130 when the detection voltage of the current sensor 141 is higher. The second current measurement unit 140 is a start sensor that detects a current of the threshold value Ix or more flowing through the assembled battery 60 and outputs a start signal Sa.

As shown in FIG. 5, the second current measuring unit 140 is located near the power line 70N of the negative electrode, and outputs a start signal to the monitoring device 130 when the current I of the power line 70N is equal to or higher than the threshold value Ix. ..

FIG. 7 shows the positional relationship between the circuit board 100 and the second current measuring unit 140. A power line 70N is located on the first surface 100A of the circuit board 100. The power line 70N is a pattern made of metal foil. The first current measuring unit 55 is located on the power line 70N on the first surface 100A of the circuit board 100. The second current measuring unit 140 is located on the second surface 100B of the circuit board 100. The second current measuring unit 140 is located directly below the power line 70N so that the magnetic field of the current I flowing through the power line 70N can be easily detected.

FIG. 8 shows the current measurement range F1 of the first current measurement unit 55 and the current measurement range F2 of the second current measurement unit 140. The first current measuring unit 55 may have a wide range so that the short-circuit current Is can be measured for battery protection. When the short-circuit current Is is about 1500 A at the maximum, the current measurement range F1 of the first current measurement unit 55 may be about 0 to 2000 [A]. The threshold value Iy is a threshold value for determining an overcurrent. The threshold value Iy is a current upper limit value at which the battery 50 can be used safely.

The current measurement range and the resolution (the smallest unit that can be detected) are generally in a trade-off relationship, and the resolution of the first current measurement unit 55 is low, and the detection accuracy of a current of 10 [A] or less is low.

The current measurement range F2 of the second current measurement unit 140 may be narrower than the current measurement range F1 of the first current measurement unit 55. The current measurement range F2 of the second current measurement unit 140 may be about 0 to 5 [A]. The threshold value Ix at which the second current measuring unit 140 outputs the start signal Sa is 1 to 2 “A”, and the second current measuring unit 140 measures a small current that is difficult to measure with high accuracy by the first current measuring unit 55. Detects and outputs the start signal Sa. The current measurement range F2 does not include the threshold value Iy and may include the threshold value Ix.

The monitoring device 130 includes a CPU 131, a memory 133, and a signal receiving unit 135 for confirming reception of the start signal Sa. The monitoring device 130 monitors the battery 50 based on the outputs of the voltage measuring unit 120, the first current measuring unit 55, and the temperature sensor. The monitoring process of the battery 50 may be a process of monitoring an abnormality of the current I of the battery 50, an abnormality of the battery voltage V of each secondary battery 62, and an abnormality of the temperature of the battery 50.

The monitoring device 130 only monitors the abnormality of the battery 50, and the SOC and SOH may not be measured. The SOC (state of charge) is the charged state of the assembled battery 50. SOC is the ratio of the remaining capacity to the full charge capacity (actual capacity). SOH (state of helth) is the health state of the assembled battery 50. SOH can be calculated from the internal resistance increase rate and the capacity maintenance rate.

The monitoring device 130 is connected to the assembled battery 60 through the branch line 137. The monitoring device 130 uses the assembled battery 60 as a power source.

The first current measuring unit 55, the signal processing circuit 58, the voltage measuring unit 120, the second current measuring unit 140, and the monitoring device 130 are monitoring units 110 that monitor the battery 50. The monitoring unit 110 is provided on the circuit board 100.

As shown in FIG. 5, the battery 50 is connected to a starter 21 which is an engine starting device, an alternator 23 which is a vehicle generator, and a general electric load 25. The general electric load 25 has a rating of 12 V, and can exemplify vehicle ECUs, headlamps, accessories, and the like.

Further, the battery 50 is communication-less and does not have a communication function with the motorcycle 10. That is, the battery 50 does not have a communication means (communication unit) that enables communication with the vehicle regardless of the communication form such as wired or wireless. Since the battery 50 is communication-less, the monitoring device 130 cannot receive information on the running state of the vehicle and the operating state of the engine 20 (engine start, engine stop, etc.) from the motorcycle 10.

FIG. 9 shows the SOC-OCV characteristics of the lithium ion secondary battery 62. The lithium ion secondary battery is an iron phosphate type using lithium iron phosphate (LiFePO4) as the positive electrode active material and graphite as the negative electrode active material. The OCV (open circuit voltage) is the open circuit voltage of the secondary battery 62. The open circuit voltage of the secondary battery 62 can be obtained by measuring the voltage of the secondary battery 62 in a state where it can be regarded as no current or no current.

In the lithium ion secondary battery 62, the SOC in the range of approximately 31% to 97% is the plateau region H1 in which the graph is substantially flat. The plateau region H1 is a region in which the amount of change in OCV with respect to the amount of change in SOC is 2 [mV /%] or less. The plateau region H1 is a first region in which the rate of change of OCV with respect to SOC is equal to or less than a predetermined value.

The range H2 in which the SOC is 31% or less and the range H3 in which the SOC is 97% or more are high change regions in which the amount of change in OCV with respect to the amount of change in SOC is larger than that in the plateau region H1.

3. 3. Start-up processing of the monitoring device The power source of the monitoring device 130 is the assembled battery 60. In order to reduce power consumption, it is preferable to stop the battery monitoring by the monitoring device 130 or reduce the frequency during the non-use period of the battery 50 such as when the engine is stopped.

The monitoring device 130 determines the operating state of the engine 20 based on the measured value of the first current measuring unit 55, and switches the monitoring mode. That is, when the current I is equal to or greater than a predetermined value, it is determined that the engine 20 is operating, and the first mode in which the battery 50 is monitored in the short cycle N1 is executed. When the current I is less than a predetermined value, it is determined that the engine 20 is stopped, and the second mode in which the battery 50 is monitored in the long period N2 is executed. N1 is 10 [ms] as an example, and N2 is 60 [s] as an example. The predetermined value is 15 [A] as an example. The internal clock of the CPU 131 may be used to switch the period N.

In the second mode, as shown in FIG. 10, the monitoring device 130 is started in a long period N2 to perform the monitoring process, and the monitoring function is stopped and paused during the period when the monitoring process is not executed. Hibernation is a state in which the monitoring function is stopped and power consumption is low. During hibernation, the monitoring device 130 only performs a reception confirmation process by the signal receiving unit 135, that is, a process of confirming whether or not the start signal Sa has been received. In FIG. 10, the execution period of the monitoring process is indicated by “W”, and the pause period of the monitoring device 130 is indicated by “R”.

FIG. 11 is a flowchart of the activation process of the monitoring device. When the electric load 25 of the motorcycle 10 is used and the current I exceeding the threshold value Ix flows during the suspension of the monitoring device 130, that is, during the suspension period R, the second current measuring unit 140 sends a start signal to the monitoring device 130. Sa is output (S10).

When the signal receiving unit 135 receives the activation signal Sa, the monitoring device 130 is activated to make the monitoring process of the battery 50 executable (S20). That is, the arithmetic unit and the memory 133 used in the monitoring process are started up so that the monitoring process can be executed. The calculation unit may be a dedicated IC provided in the monitoring device 130, or may be a part of the CPU 131. Then, after the monitoring device 130 is started, the monitoring mode is switched from the second mode to the first mode, started in the short cycle N1, and the monitoring of the battery 50 is restarted (S40).

When the start signal Sa is received at time t1, as shown in FIG. 10, the monitoring device 130 executes the monitoring process at time t1, and thereafter monitors the battery 50 in the first mode.

During the first mode, the monitoring device 130 does not have to stop the signal receiving unit 135 to confirm the reception of the start signal Sa. The reception confirmation of the activation signal Sa may be performed for the pause period R of the monitoring device 130 in the second mode.

5. Explanation of effect When a current exceeding the threshold value Ix is detected, the second current measuring unit 140 outputs a start signal Sa to the monitoring device 130. When the monitoring device 130 receives the start signal Sa during hibernation, the monitoring device 130 resumes monitoring of the battery 50 in response to the start signal Sa. That is, if a current exceeding the threshold value Ix flows through the battery 50 while the monitoring device 130 is inactive, the monitoring of the battery 50 is started by using this as a trigger, so that the safety of the battery 50 can be ensured.

In particular, as shown in FIG. 9, the lithium ion secondary battery 62 has a high change region H2 and a high change region H3 in which the change amount of OCV with respect to the change amount of SOC is larger than that of the plateau region H1. In the high change region H2 and the high change region H3, even a slight SOC change due to a small current may cause a sudden change in voltage, resulting in overcharging or overdischarging. By using this technique, it is possible to prevent the lithium ion secondary battery 62 from being in a dangerous state such as over-discharging or over-charging.

Since the second current measuring unit 140 has a narrow current measuring range F2 as compared with the first current measuring unit 55, it is possible to detect a small current that is difficult for the first current measuring unit 55 to detect, and the small current is detected. Then, the monitoring device 130 can be activated.

Since the battery 50 for a motorcycle is more cost-oriented than that for an automobile, it may not have a communication function with the vehicle. The battery 50, which does not have a communication function, cannot control the activation of the monitoring device 130 by acquiring the state of the motorcycle 10 by communication, and the activation of the monitoring device 130 is determined only from the current value. I can't. By applying this technology, it is possible to detect a small current and start the monitoring device 130, so that the electric load 25 of the motorcycle 10 is used and the current at a level that is difficult for the first current measuring unit 55 to detect is generated. When the current flows, the monitoring device 130 can be activated even if there is no communication function, and it is possible to prevent the battery 50 from being left unmonitored.

The monitoring device 130 does not measure SOC and SOH. The battery 50 that does not measure SOC and SOH does not require a high-precision current measurement function, and it is not appropriate to use a high-precision sensor for the first current measurement unit 55. By applying this technology, it is possible to detect start-up with a small current without using a high-precision sensor for the first current measurement unit 55, and it is also possible to protect against overcurrent.

The battery 50 for a motorcycle is for starting an engine. The battery 50 for starting the engine discharges a large current when the engine is started. The current sensor 141 is magnetic and non-contact. Therefore, even if the battery 50 discharges a large current, heat generation is small and failure is unlikely to occur, so that it is possible to prevent a start failure of the monitoring device.

<Other embodiments>
The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In the first embodiment, the secondary battery 62 is illustrated as an example of the power storage element. The power storage element is not limited to the secondary battery 62, and may be a capacitor. The secondary battery 62 is not limited to the lithium ion secondary battery, and may be another non-aqueous electrolyte secondary battery. Lead-acid batteries and the like can also be used. The power storage element is not limited to the case where a plurality of energy storage elements are connected in series and parallel, and may be connected in series or in a single cell configuration.

(2) In the first embodiment, the battery 50 is used for starting the engine. The usage of the battery 50 is not limited to a specific usage. The battery 50 may be used for various purposes such as for mobile bodies (for vehicles, ships, AGVs, etc.) and for industrial purposes (power storage devices for power failure-free power generation systems and photovoltaic power generation systems). The vehicle is not limited to a motorcycle, but may be a motorcycle.

(3) In the first embodiment, the monitoring unit 110 includes a first current measuring unit 55, a signal processing circuit 58, a voltage measuring unit 120, a monitoring device 130, and a second current measuring unit 140. The monitoring unit 110 may include at least the first current measuring unit 55, the monitoring device 130, and the second current measuring unit 140, and the voltage measuring unit 120 and the signal processing circuit 58 may be omitted.

(4) In the first embodiment, as the monitoring mode of the battery 50, a first mode for monitoring the battery 50 in the short cycle N1 and a second mode for monitoring the battery 50 in the long cycle N2 are provided. Monitoring in the long period N2 may be changed to "monitoring stop". That is, when the current I is equal to or more than the predetermined value, it is determined that the engine 20 is operating, the battery 50 is monitored in a short cycle N1, and when the current I is less than the predetermined value, the engine 20 is stopped. Therefore, the monitoring of the battery 50 may be stopped and the monitoring device 130 may be suspended. The monitoring device 130 may be activated when the start signal Sa is received from the second current measuring unit 140 during the period in which the monitoring of the battery 50 is stopped, and the monitoring of the battery 50 may be resumed.

(5) In the first embodiment, the second current measuring unit 140 has a current sensor 141 and a comparator 145. The second current measuring unit 140 may have a current sensor 141 and an amplifier, and may amplify and output the current value measured by the current sensor 141 by using the amplifier. When the current value is output from the second current measuring unit 140 to the monitoring device 130, the signal receiving unit 135 may receive the current value and determine the level of the current value to determine whether or not to start. In the first embodiment, the current sensor 141 is a magnetic type, but other detection methods may be used.

10 Motorcycle 50 Battery (power storage device)
51, 52 External terminal 53 Current cutoff device 55 First current measurement unit 60 sets Battery 62 Secondary battery (power storage element)
110 Monitoring unit 120 Voltage measuring unit 130 Monitoring device 135 Signal receiving unit 140 Second current measuring unit 141 Current sensor 145 Comparator

Claims (11)

It is a monitoring unit for power storage elements.
A first current measuring unit that measures the current of the power storage element, and
A second current measuring unit that measures the current of the power storage element, and
Including monitoring equipment
The first current measuring unit has a current measuring range capable of detecting an overcurrent.
The current measurement range of the second current measurement unit is narrower than the current measurement range of the first current measurement unit.
When the second current measuring unit detects a current equal to or higher than the threshold value during hibernation, the monitoring device is activated to monitor the state of the power storage element based on the measured value of the first current measuring unit. unit. The monitoring unit according to claim 1.
The second current measuring unit is a monitoring unit having a magnetic current sensor. The monitoring unit according to claim 1 or 2.
The second current measuring unit is a start sensor that detects a current equal to or higher than the threshold value flowing through the power storage element and outputs a start signal.
The monitoring device is a monitoring unit that starts in response to the start signal and monitors the state of the power storage element. The monitoring unit according to claim 3.
The activation sensor is a monitoring unit including a current sensor and a comparator that compares the current measurement value of the current sensor with the threshold value and outputs the activation signal. Power storage element and
A power storage device comprising the monitoring unit according to any one of claims 1 to 4. The power storage device according to claim 5.
The power storage element is a power storage device that is a lithium ion secondary battery. The vehicle-mounted power storage device according to claim 5 or 6.
A power storage device that does not have a communication function with the vehicle. The power storage device for motorcycles according to any one of claims 5 to 7. The power storage device for starting an engine according to any one of claims 5 to 8. The power storage device according to any one of claims 5 to 9.
The monitoring device is a power storage device that does not measure the SOC and SOH of the power storage element. How to start the monitoring unit
The monitoring unit
The first current measuring unit that measures the current of the power storage element and
A second current measuring unit that measures the current of the power storage element, and
Including monitoring equipment
The first current measuring unit has a current measuring range capable of detecting an overcurrent.
The current measurement range of the second current measurement unit is narrower than the current measurement range of the first current measurement unit.
A method of starting a monitoring unit, wherein the monitoring device is started when the second current measuring unit detects a current equal to or higher than a threshold value during hibernation.

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