JP6176213B2 - Power storage system - Google Patents

Description

  The present invention relates to a power storage system. Specifically, the present invention relates to a technique for determining whether or not the power storage system can be operated according to the degree of the impact when the power storage system receives a mechanical shock or a thermal shock.

In the conventional technology, if the storage battery is subjected to a mechanical shock or high temperature exposure that affects reliability when the storage system is stopped and the storage battery monitoring device is also powered off, there is no record and the operation is restarted. Sometimes, the operator performs operations without noticing the history of various impacts. Depending on the degree of the history of these various impacts, the battery may be damaged even if the appearance does not change.
For example, there is no change in appearance due to mechanical shock, but if you try to operate next time when the battery voltage is abnormally lowered due to an internal short circuit, you can not start the power storage system by detecting the voltage abnormality A situation occurs. In addition, even if the voltage of the battery is lowered, if it is allowed to operate, it will continue to operate with an internal short circuit due to local abnormal heat generation, side reaction, etc. System operation may be difficult.
In addition, for example, there is no change in appearance due to exposure to high temperature, but the irreversible inside that does not return even if the high temperature state disappears due to deposition of side reaction products on the electrode due to high temperature, melting of the separator, etc. When resistance increases, even if the next operation is attempted after the high-temperature condition is resolved, voltage operation due to increased resistance loss, and even if it is within the allowable range, heat generation will be greater than usual. May be difficult.
Therefore, if a history of mechanical shock that causes the internal short circuit of the battery is recorded, it is possible to quickly identify the cause and take countermeasures.
For example, in a conventional power storage system, as a means for detecting a mechanical shock, for example, a pressure detection sheet having a property that electrical resistance changes when deformed by pressure between a battery pack casing and a battery is detected and detected. When the impact is detected from the measured resistance value and exceeds a preset first threshold, charging / discharging of the battery is prohibited (Patent Document 1).
As a method for detecting temperature, for example, a temperature detection label that is thermally connected to a rechargeable battery changes color due to a change in the battery temperature of the rechargeable battery. It is supposed to be controlled (Patent Document 2).

JP 2008-258110 A JP-A-3-135337

  However, in the conventional mechanical shock detection means of the power storage system as in Patent Document 1, for example, the pressure is applied to the pressure detection sheet when the battery pack is dropped, and the outer shape is changed so that the change can be confirmed. Impact detection by a large mechanical impact is possible. However, although the external shape has not changed, it has been difficult to detect a moderate impact to the extent that the inside of the battery is damaged.

  Moreover, in the temperature detection means of the electrical storage system like the conventional patent document 2, it describes that the change of the battery temperature accompanying charge is detected by detecting the discoloration of the temperature detection label to control the charge. However, this technique was not applicable even when the battery was temporarily exposed to high temperatures that could cause damage, and then returned to room temperature.

  The present invention has been made to solve the above-described problems, and has an impact detection function capable of grasping an impact history even when the storage system is stopped and the storage battery monitoring device is turned off. The purpose is to obtain a power storage system.

The power storage system according to the present invention includes a storage battery, a control unit that controls input or output of the storage battery, a detection unit that changes its optical physical property irreversibly due to an impact applied to the storage battery, and a change in the optical physical property of the detection unit. The sensor unit has a pre-determined relationship between the impact applied to the storage battery and the change in internal resistance due to the impact, and the allowable value of the internal resistance corresponding to the degree of impact, and the degree of impact upon receiving an output signal from the sensor unit And a determination unit for determining.
When the power storage system is started from the stopped state, the determination unit reads the output signal from the sensor unit to determine whether or not the shock is received during the stopped state. The determination unit measures the open circuit voltage of the storage battery, and if the measurement result is not within the predetermined range, the determination unit determines that the storage battery is damaged and sends the result to the control unit, while the measurement result is within the predetermined range. In this case, the determination unit measures the internal resistance of the storage battery, determines whether the internal resistance is within a predetermined reference value range, and determines that the storage battery is damaged if it is out of the range, and controls the result. It is characterized by being sent to the department.

  Since the power storage system according to the present invention is configured as described above, it realizes a power storage system having an impact detection function capable of grasping the history of impact even when the power storage system is stopped and the storage battery monitoring device is turned off. it can.

It is a block diagram which shows the electrical storage system by Embodiment 1 of this invention. It is a figure which shows the example of an impact detection label installation by Embodiment 1 of this invention. It is a figure which shows the internal resistance measurement example of the healthy battery by Embodiment 1 of this invention. It is a figure which shows the example which set the upper and lower limit value of the internal resistance value in 25 degreeC by Embodiment 1 of this invention. It is a figure which shows the example of the impact detection label setting value by Embodiment 1 of this invention. It is a figure which shows another form by Embodiment 1 of this invention. It is a block diagram which shows the temperature detection apparatus by Embodiment 2 of this invention. It is a figure which shows the temperature detection label installation example by Embodiment 2 of this invention. It is a figure which shows the example of the temperature detection label setting value by Embodiment 2 of this invention. It is a figure which shows another form by Embodiment 2 of this invention. It is a block diagram which shows the impact and temperature detection apparatus by Embodiment 3 of this invention.

Embodiment 1 FIG.
First, a configuration of a current distribution control device for a power storage system according to the present invention and a control method thereof will be described with reference to the drawings. The drawings are schematic and conceptually illustrate functions and structures. Further, the present invention is not limited to the embodiments described below. Unless otherwise specified, the basic configuration of the power storage system is common to all the embodiments. Moreover, what attached | subjected the same code | symbol is the same or equivalent, and this is common in the whole text of a specification.

FIG. 1 is a diagram illustrating a configuration example of a power storage system according to the present embodiment.
As shown in FIG. 1, the power storage system 1 according to the present embodiment includes a battery pack (or battery module or cell) 29 that is a storage battery, a current measurement unit 21, a voltage measurement unit 22, and a power storage system control device 28. doing. A current measuring unit 21 and a voltage measuring unit 22 are connected to the battery pack 29 to measure the current flowing through the battery pack 29 and the voltage between terminals.
The battery pack 29 is attached with an impact detection label A11, an impact detection label B12, and an impact detection label C13 (hereinafter sometimes referred to as impact detection labels A, B, and C). The impact detection label has a characteristic of changing from a predetermined color to another color when an impact exceeding a threshold value is applied, and maintaining the state. In addition, it is possible to select impact detection labels having different threshold values step by step according to the strength of the impact to be detected. In this embodiment, three types of impact detection labels A11, impact detection labels B12, and impact detection labels C13 having different detectable thresholds are used. Moreover, since the mechanical impact value at which the storage battery may be damaged is different for each target storage battery type, a necessary value is set for each target storage battery type. For example, a shock watch (registered trademark) manufactured by Media Recovery Co. can be used as the impact detection label. The power storage system 1 also includes a color detection sensor 25 for reading the color change of the impact detection label. A light source 24 is also provided as an illumination light source for the impact detection label.
Furthermore, the power storage system 1 includes an impact determination device 16. The impact determination device 16 determines the intensity of impact applied to the battery pack 29 in response to the lighting control of the light source 24 and the output signal from the sensor unit 25.

Next, the configuration of the battery pack 29, the impact detection labels A, B, C, and the color detection sensor 25 will be described in detail with reference to FIG. In FIG. 2, for example, impact detection labels A, B, and C that are sensitive to impacts from all directions in the X-axis direction, the Y-axis direction, and the Z-axis direction are installed on the battery pack 29 containing eight cells. Is the case. The level of damage to impact varies depending on the battery pack, module, and cell, but the purpose is to detect damage to the cell, so when attaching a detection label to a module or battery pack, It is necessary to prepare and set in advance a conversion value for a cell that is a component of the impact received by the battery pack by a test or calculation.
The impact detection labels A, B, and C can be irradiated with light at any timing by a light source 24 such as an LED, and the reflected light is received by the color detection sensor 25 to change the color of the impact detection labels A, B, and C. Recognize changes. As the color detection sensor 25, for example, a color sensor made of a photodiode manufactured by Hamamatsu Photonics can be used.
The impact detection labels A, B, and C are labels having different sensitivities, and the respective color change states are individually acquired by the color detection sensor 25. By using labels with different impact threshold values, the degree of impact applied to the battery pack 29 can be estimated.

  In the case of FIG. 2, an impact detection label that is sensitive to impacts from all directions in the X axis direction, the Y axis direction, and the Z axis direction is used. If it is clear, the minimum required function can be achieved by installing an impact detection label that shows sensitivity only to impact from that direction.

Here, the relationship between the impact applied to the storage battery and the allowable value for damage to the storage battery will be described. The relationship between the impact applied to the storage battery and the allowable value is acquired in advance by performing an impact test or simulation using the target storage battery.
The mechanical impact test is performed on the target storage battery by changing the impact strength with respect to the impact in the X direction, the Y direction, and the Z direction.
After the mechanical shock test, the degree of damage of the battery is confirmed by open circuit voltage and internal resistance measurements. How the mechanical shock damages the target storage battery depends on the internal structure and material of each storage battery, but the resistance increases due to the breakage of the current collecting structure in the internal structure of the storage battery, opposite positive and negative electrodes A short circuit occurs due to misalignment of the laminated structure or damage to the insulating structure.

但し、Ｒ_ｄｃ：直流内部抵抗（Ω）、Ｉ_１、Ｉ_２：放電電流値（A）、Ｕ_１、Ｕ_２：放電中に測定される電圧（V）。 The internal resistance can be measured, for example, using the method described in 8.6 Internal Resistance Test of JIS C 8715-1. First, the battery is discharged at a current value I ₁ A for a predetermined time, and a voltage U ₁ during energization immediately before the end of discharge is measured. Next, the battery is discharged at a current value I ₂ A different from I ₁ for a predetermined time, and the voltage U ₂ being energized immediately before the end of discharge is measured. The DC internal resistance R _dc is obtained by the following equation.

Where R _dc : DC internal resistance (Ω), I ₁ , I ₂ : discharge current value (A), U ₁ , U ₂ : voltage (V) measured during discharge.

The internal resistance in a healthy state in an environment where the target storage battery is used, SOC (State of Charge) is measured in advance. FIG. 3 shows a measurement example of the internal resistance of a healthy storage battery. In general, the higher the temperature, the smaller the internal resistance and the value depending on the SOC.
Based on the internal resistance value of this healthy storage battery, the upper and lower limit control value ranges for the specific performance and safety internal resistance are set for each target storage battery considering the restrictions (heat generation, input / output characteristics) in actual operation To do. In addition, if the upper and lower limit allowable ranges are set for each temperature, options for conditions under which the impact determination can be performed are widened.

FIG. 4 is a diagram in which upper and lower permissible values are set based on an internal resistance value of 25 ° C., for example, when it is decided to make an impact determination at 25 ° C. The upper limit B _hi for performance sets a range in which necessary input / output characteristics of the power storage system can be secured, and the lower limit B _{lo for} performance sets a range of manufacturing variation. The upper limit of safety control value A _hi is the range that causes unacceptable heat generation when it is normally energized during the operation of the power storage system, and the lower limit of safety control value A _lo is set to the point that causes an internal short circuit and clearly shows a low value To do.

  Therefore, the impact level (threshold value) of the impact detection labels A, B, and C is set to a level at which the received impact does not cause an abnormality in the storage battery (impact detection label C), and a level exceeding the allowable value in performance (impact detection label B) Set to a level (impact detection label A) that is higher than the safety control value.

Here, an example of setting the impact level (threshold) will be described.
The sensitivity of the impact detection labels 1 to 3 is set to impact detection labels A, B, and C shown in FIGS. 4 and 5, respectively. Table 1 shows the relationship between the discoloration pattern of each of the impact detection labels 1 to 3, the impact, and the internal resistance state of the cell. When all the impact detection labels A, B, and C are not discolored, no impact is received. When only the impact detection label C is discolored, it is detected that an impact of a level that does not cause an abnormality in the cell is received. When the impact detection labels B and C are discolored, the impact detection label B or C has received a level of impact that exceeds the allowable value in performance (that is, the impact that causes the performance degradation and exceeds the level that can tolerate the performance degradation). Is detected. When all of the impact detection labels A, B, and C are discolored, it is detected that the cell has received a large impact that may exceed the upper limit of the safety management value. Further, the color detection sensor 25 can recognize the color change of the impact detection labels A, B, and C.

Next, the operation of the power storage system will be described.
The power storage system control device 28 collects a record of the mechanical shock that affects the reliability when the power storage system is stopped. Specifically, the impact determination device 16 shown in FIG. 1 determines the intensity of impact applied to the battery pack 29 in response to the lighting control of the light source 24 and the output signal from the sensor unit 25. When it is detected that an impact has been received, the impact determination device 16 uses the voltage measurement unit 22 to measure and confirm the open circuit voltage. If the open circuit voltage has dropped significantly, the impact determination device 16 determines that an internal short circuit has occurred in the storage battery 29 due to the impact, transmits the determination result to the power storage system control device 28, and prohibits charging / discharging of the storage battery 29, etc. Take safety measures.

  On the other hand, if it is detected that an impact has been received and no significant decrease in the open circuit voltage is confirmed, internal resistance measurement is performed. The internal resistance is measured by charging and discharging the storage battery 29 using the power generation system controller 28 and the load device 45, for example, using the method described in 8.6 Internal Resistance Test of JIS C 8715-1. I can do it.

  By preparing an allowable value for the internal resistance value of the storage battery in advance, even if the external appearance is not deformed or damaged, it is recognized that the storage battery may have received a shock that causes damage. There is an advantage that it is possible to detect damage due to impact by judging the confirmation of the open circuit voltage together with the measured value of the internal resistance.

  In addition, by installing multiple impact detection levels according to the range of internal resistance, even if the battery can be used, you can manage the history of minor internal damage due to impact in the past. There is an advantage that the risk can be further reduced by performing confirmation.

  In addition, by managing the internal resistance value and impact level together, it is possible to understand the cause and level of damage to the battery, so the operation of the power storage system and the level of safety measures according to the damage level, When repair is necessary, there is an advantage that smooth repair is possible.

  In addition, since light sources such as impact detection labels and LEDs, and color detection elements can be downsized, battery damage due to impacts is detected even when visual observation is difficult due to the battery module or battery pack structure and installation location. There is an advantage that you can.

  In the above-described embodiment, three types of sensitivity are used for the impact detection labels 1 to 3, but it is possible to detect more finely by increasing the number, and as shown in FIG. Necessary settings can be made in accordance with the operation of the power storage system, such as managing only the upper and lower limits of, and managing the upper and lower limits for safety.

  Moreover, about the impact detection method, the impact detection label was used in the above-mentioned form. However, there are other methods as means for detecting the impact. For example, for the impact detection and holding when the power is off, a two-component mixed curable resin having a property of curing when two liquids of a main agent and a curing initiator in a liquid state are mixed is used. A liquid of the main agent is sealed in a predetermined bag (such as a plastic bag), and a sub-bag (such as a smaller-sized plastic bag) in which a curing initiator is sealed is mixed into the bag containing the main agent. When the liquid bag is attached to a predetermined gap in the storage battery system, and the gap between the bags is changed due to the impact of the bag, the sub-bag is broken and the two liquids are mixed, so that the main agent is cured. In addition, the material of the sub bag is more likely to be broken by impact. As the main agent, monomers (monomers) such as epoxy resins, silicone resins and acrylic resins, and low molecular weight substances can be used. The curing agent is a polymerization initiator in which the main monomer starts polymerization and becomes a polymer. The impact is detected by detecting changes in physical properties of the main agent before and after curing. As a method for detecting a change in physical properties of the main agent before and after curing, since the optical property changes, it is possible to detect curing from a change in transmitted light or reflected light by irradiating light when the power is turned on next time. Alternatively, as a method for detecting a change in physical properties of the main agent before and after curing, a shape change due to curing can also be detected by strain measurement.

The above-described embodiment can be summarized as follows. The storage system of the present embodiment includes a storage battery 29, a control unit 28 that controls input or output of the storage battery 29, a detection unit 11 whose optical physical properties change irreversibly due to an impact applied to the storage battery 29, and a detection unit 11 The sensor unit 26 that reads the change in the optical properties, the relationship between the impact applied to the storage battery 29 and the change in internal resistance due to the impact, and the allowable value of the internal resistance according to the degree of the impact in advance, from the sensor unit 26 And a determination unit 16 that receives the output signal and determines the degree of impact.
Then, when the power storage system is started from the stopped state, the determination unit 16 reads an output signal from the sensor unit 26 to determine whether or not the shock is received during the stopped state, and the shock is greater than a predetermined threshold. In this case, the determination unit 16 measures the open circuit voltage of the storage battery 29, and if the measurement result is not within the predetermined range, the determination unit 16 determines that the storage battery 29 is damaged and sends the result to the control unit 28, while measuring When the result is within the predetermined range, the determination unit 16 measures the internal resistance of the storage battery 29 to determine whether the internal resistance is within the predetermined reference value range. When the result is out of the range, the storage battery 29 is damaged. The power storage system determines that it has been received and sends the result to the control unit.

  According to the power storage system according to the present embodiment as described above, even when the power storage system is stopped or the storage battery monitoring device is turned off and not operating, a record of impact remains, and the power storage system is restarted. Sometimes, it is possible to prevent the operator from performing an operation without recognizing damage caused by the impact. That is, it is possible to realize a power storage system having an impact detection function that can grasp the history of impact even when the power storage system is stopped and the storage battery monitoring device is turned off.

Embodiment 2. FIG.
In the first embodiment, an example in which a mechanical impact is detected as an example of an impact applied to the power storage system has been described. However, the impact on the electricity storage system is not limited to mechanical impact. That is, heat is also a factor that damages the power storage system. In this embodiment, when a storage battery is exposed to a high temperature state, an example of detection of the high temperature state and subsequent control of the power storage system will be described.

  The apparatus configuration is the same as that in the first embodiment. In order to avoid complication of explanation, the following explanation will focus on the configuration unique to this embodiment.

  FIG. 7 is a diagram illustrating a configuration example of the power storage system according to the present embodiment. FIG. 8 shows a case where, for example, a plurality of types of temperature detection labels are installed on the battery pack 29 containing eight cells.

  As shown in FIG. 1, the power storage system 1 according to the present embodiment includes a battery pack (or battery module or cell) 29 that is a storage battery, a current measurement unit 21, a voltage measurement unit 22, and a power storage system control device 28. doing. A current measuring unit 21 and a voltage measuring unit 22 are connected to the battery pack 29 to measure the current flowing through the battery pack 29 and the voltage between terminals.

  The battery pack 29 is attached with a temperature detection label D31, a temperature detection label E32, and a temperature detection label F33 (hereinafter sometimes referred to as temperature detection labels D, E, and F). The temperature detection label has a characteristic of changing from a predetermined color to another color when a temperature equal to or higher than a threshold is applied, and maintaining the state. Further, it is possible to select temperature detection labels having different threshold values in stages according to the temperature to be detected. In this embodiment, three types of temperature detection labels D31, a temperature detection label E32, and a temperature detection label F33 having different detectable temperature thresholds are used. Moreover, since the high temperature at which the storage battery may be damaged differs for each target storage battery type, a necessary value is set for each target storage battery type.

  The power storage system 1 also has a color detection sensor 25 for reading the color change of the temperature detection label. A light source 24 is also provided as an illumination light source for the temperature detection label.

  Further, the power storage system 1 has a temperature determination device 36. The temperature determination device 36 determines the height of the temperature applied to the battery pack 29 in response to the lighting control of the light source 24 and the output signal from the sensor unit 25.

  A plurality of labels (temperature detection labels D, E, and F) having different sensitivities are attached to the battery pack 29, and the respective color change states are individually acquired. The relationship between the temperature of the battery pack 29 and the allowable value is acquired in advance by a value in the temperature range described in the instruction manual issued by the battery manufacturer, or by a temperature exposure test or simulation using the target power storage system 1.

  When the temperature exposure test is performed, the environmental temperature is changed with respect to the target power storage system 1. The degree of damage to the storage battery is confirmed by measuring the open circuit voltage and internal resistance. How the environmental temperature damages the target storage battery varies depending on the internal structure and material of each storage battery, but resistance due to accumulation of side reaction products inside the battery and thermal deformation of components due to high temperatures As the temperature increases and the temperature increases, an internal short circuit occurs due to significant deformation of the components.

  Specifically, the cell is set to a predetermined environmental temperature, and the cell temperature and the cell internal resistance are measured. For example, the internal resistance of the cell can be measured by using the method described in 8.6 Internal Resistance Test of JIS C 8715-1. The relationship shown in FIG. 4 can be used for the upper limit value and the lower limit value of the internal resistance.

  In the case of FIG. 8, the temperature detection label is installed only at the center of one side of the module. However, if there is a place where overheating from the outside is expected or there is a place where temperature monitoring is necessary due to the structure of the equipment, Install.

  The sensitivities of the temperature detection labels 31 to 33 are set to D, E, and F in FIGS. 4 and 9, respectively. Specifically, the temperature level (threshold value) of the temperature detection labels D, E, and F is a level that does not cause an abnormality in the storage battery (F), a level that is higher than the allowable value for performance (E), and safety management. Set the level (D) above the value.

  Table 2 shows the relationship between the discoloration pattern of each temperature detection label D, E, and F, the temperature level, and the internal resistance state of the cell. When all the temperature detection labels D, E, and F are not discolored, they are not exposed to high temperature. When only the temperature detection label F is discolored, it is detected that there has been exposure to a temperature at a level that does not cause an abnormality inside the cell. When the temperature detection labels F and E are discolored, it is detected that the temperature exposure has exceeded the upper limit (lower limit) in terms of performance. When all of the temperature detection labels D, E, and F are discolored, it is detected that the cell has been exposed to a high temperature that may exceed the safety upper limit (lower limit).

  When it is detected that high temperature exposure has occurred, the temperature determination device 36 of FIG. If the open circuit voltage has dropped significantly, the temperature determination device 36 determines that a short circuit has occurred due to high temperature exposure, transmits the determination result to the power storage system control device 28, and prohibits charging / discharging of the storage battery 29. I do.

  In addition, if it is detected that there has been exposure to high temperatures and no significant decrease in open circuit voltage is confirmed, internal resistance measurement is performed. The internal resistance is measured by charging and discharging the storage battery 29 using the power generation device 24 and the load device 25 by the power storage system control device 28, for example, using the method described in 8.6 Internal Resistance Test of JIS C 8715-1. I can do it.

  Recognizing that there is a risk of high-temperature exposure causing damage to the electricity storage system, even if the external appearance is not deformed or damaged by preparing an allowable value for the internal resistance value of the electricity storage system in advance. On top of that, there is an advantage that it is possible to detect damage caused by high-temperature exposure by judging the confirmation of the open circuit voltage and the measured value of the internal resistance.

  In addition, by installing multiple temperature detection levels according to the range of internal resistance, it is possible to manage the history of high-temperature exposure and minor internal damage in the past even if the battery can be used. There is an advantage that the risk can be further reduced by checking sometimes.

In addition, by managing the internal resistance value and the exposure temperature level together, it is possible to grasp the cause and level of damage of the battery, so that there is an advantage that smooth repair is possible. In addition, light sources such as temperature detection labels and LEDs, and color detection elements can be miniaturized, so battery damage due to high-temperature exposure can be detected even when visual observation is difficult due to the shape and location of the battery module or battery pack. There is an advantage that can be done.

  In this embodiment, three types of sensitivity are used for the temperature detection labels D, E, and F. However, it is possible to detect the temperature detection labels more finely by increasing the number, and as shown in FIG. Necessary settings can be made in accordance with the operation of the power storage system, such as managing only the upper and lower limits of, and managing the upper and lower limits for safety.

  Moreover, about the temperature detection method, the temperature detection label was used with the above-mentioned form. However, there are other methods for detecting high temperatures. For example, for detecting and holding an abnormally high temperature when the power is off, a thermosetting resin having a property of being cured in a liquid state when exposed to a predetermined temperature or higher is used. The liquid before thermosetting is sealed in a predetermined bag, the liquid bag is attached to a predetermined position in the power storage system, and the main agent is cured when the bag is exposed to a temperature higher than a predetermined temperature. As the main agent, an epoxy resin, an acrylic resin, or the like can be used. The impact is detected by detecting changes in physical properties of the main agent before and after curing. As a method for detecting a change in physical properties of the main agent before and after curing, since the optical property changes, it is possible to detect curing from a change in transmitted light or reflected light by irradiating light when the power is turned on next time. Alternatively, as a method for detecting a change in physical properties of the main agent before and after curing, a shape change due to curing can be detected by strain measurement.

  The above-described embodiment can be summarized as follows. The power storage system of the present embodiment includes a storage battery 29, a control unit 28 that controls input or output of the storage battery 29, a detection unit 31 whose optical properties change irreversibly due to heat applied to the storage battery 29, and a detection unit 31 The sensor unit 26 that reads the change in optical properties, the relationship between the heat applied to the storage battery 29 and the change in internal resistance due to the heat, and the allowable value of the internal resistance according to the degree of the heat in advance, from the sensor unit 26 And a determination unit 16 that receives the output signal and determines the degree of heat.When the power storage system starts from the stopped state, the determination unit 36 reads the output signal from the sensor unit 26 and receives heat during the stopped state. When the heat of the predetermined threshold value or more is received, the determination unit 36 measures the open circuit voltage of the storage battery 29. If the measurement result is not within the predetermined range, the storage battery 29 is damaged. Measurement result while sending the result to the control unit 28 When it is within the predetermined range, the determination unit 36 measures the internal resistance of the storage battery 29, determines whether the internal resistance is within the predetermined reference value range, and if it is out of the range, the storage battery 29 is damaged. This is a power storage system that determines and sends the result to the control unit 28.

  According to the power storage system according to the present embodiment as described above, even when the power storage system is stopped or the storage battery monitoring device is turned off and not operating, the high-temperature record applied to the storage battery remains, It is possible to prevent the operator from operating without recognizing damage caused by high temperature exposure when the system is restarted. That is, it is possible to realize a power storage system having a detection function capable of grasping a history of high temperature even when the power storage system is stopped and the storage battery monitoring device is turned off.

Embodiment 3 FIG.
The present embodiment is an example of detecting a case where the power storage system is exposed to a mechanical shock and a high temperature state as factors that damage the power storage system, and controlling the subsequent power storage system.

  FIG. 11 shows a state in which the functions of the impact detection label, the color detection sensor, and the impact determination device described in Embodiment 1 and the temperature detection label, the color detection sensor, and the temperature determination device described in Embodiment 2 are simultaneously mounted. FIG. Both the configurations of the first and second embodiments are installed at the same time, and both impact and temperature are detected simultaneously. In addition to this, multiple sensitivity temperature detection and impact detection may be combined, and can be selected according to the accuracy to be detected.

  It should be understood that the above-described embodiment is illustrative in all respects and not restrictive. The scope of the present invention is shown not by the scope of the above-described embodiment but by the scope of claims, and includes all modifications within the meaning and scope equivalent to the scope of claims.

  DESCRIPTION OF SYMBOLS 1 Power storage system, 11 Impact detection label A, 12 Impact detection label B, 13 Impact detection label C, 16 Impact judgment apparatus, 21 Current measurement part, 22 Voltage measurement part, 24 Light source, 25 Color detection sensor, 26 Sensor part, 28 Power storage system control device, 29 Battery pack or module or cell, 31 Temperature detection label D, 32 Temperature detection label E, 33 Temperature detection label F, 36 Temperature determination device, 37 Impact / temperature determination device, 44 Power generation device, 45 Load device .

Claims (6)

A storage battery,
A control unit for controlling input or output of the storage battery;
A detection unit whose optical physical properties change irreversibly due to an impact applied to the storage battery;
A sensor unit for reading a change in optical properties of the detection unit;
The determination of judging the degree of impact based on the relationship between the impact applied to the storage battery and the change in internal resistance due to the impact, and the allowable value of the internal resistance corresponding to the degree of impact, and receiving the output signal from the sensor unit And
With
When the power storage system starts from a stopped state, the determination unit reads an output signal from the sensor unit to determine whether or not an impact is received during the stopped state,
When receiving an impact equal to or greater than a predetermined threshold, the determination unit measures the open circuit voltage of the storage battery, and determines that the storage battery is damaged when the measurement result is not within a predetermined range. While sending to the control unit,
When the measurement result is within a predetermined range, the determination unit measures the internal resistance of the storage battery and determines whether the internal resistance is within a predetermined reference value range. Determine that the device is damaged and send the result to the control unit.
Power storage system. Multiple types of detectors with different sensitivity to impact,
A plurality of sensor units for reading changes of the plurality of types of detection units;
The determination unit determines the degree of impact based on output signals obtained from a plurality of types of detection units.
The power storage system according to claim 1.   The sensitivity of multiple types of detectors to impact is determined from the relationship between the impact applied to the storage battery and the change in internal resistance due to the impact. The power storage system according to claim 2, wherein three kinds of impacts at a level equal to or higher than a management value are set. A storage battery,
A control unit for controlling input or output of the storage battery;
A detector that irreversibly changes its optical properties due to heat applied to the storage battery;
A sensor unit for reading a change in optical properties of the detection unit;
The determination of judging the degree of heat by receiving in advance the relationship between the heat applied to the storage battery and the change in internal resistance due to the heat and the allowable value of the internal resistance corresponding to the degree of heat, and receiving the output signal from the sensor unit And
With
When the power storage system starts from a stopped state, the determination unit reads an output signal from the sensor unit to determine whether heat has been received during the stopped state,
When receiving heat of a predetermined threshold value or more, the determination unit measures an open circuit voltage of the storage battery, and determines that the storage battery is damaged when the measurement result is not within a predetermined range. While sending to the control unit,
When the measurement result is within a predetermined range, the determination unit measures the internal resistance of the storage battery and determines whether the internal resistance is within a predetermined reference value range. Determine that the device is damaged and send the result to the control unit.
Power storage system. Multiple types of detectors with different sensitivity to temperature,
A plurality of sensor units for reading changes of the plurality of types of detection units;
The determination unit determines the degree of heat based on output signals obtained from a plurality of types of detection units.
The electrical storage system of Claim 4 characterized by the above-mentioned.   The sensitivity to temperature of multiple types of detectors is determined from the relationship between the heat applied to the storage battery and the change in internal resistance due to that heat. The power storage system according to claim 5, wherein the temperature is set to three kinds of temperatures at a level equal to or higher than a management value.

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