JP7171491B2 - Measuring device and measuring method for internal short-circuit state quantity - Google Patents

Description

The present invention relates to an internal short-circuit state quantity measuring device and measuring method.

Conventionally, there has been known an internal short-circuit testing device that includes a pressurizing plate that pressurizes a battery and a projecting portion that protrudes from the pressurizing plate by a predetermined length and pierces the battery (see, for example, Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2018-113230

By the way, the internal short-circuit testing apparatus according to the conventional technology detects the voltage drop of the battery while piercing the battery with the projecting portion in order to determine whether or not an internal short-circuit has occurred in the battery. However, it is difficult to analyze the short-circuit characteristics and short-circuit behavior in detail only by detecting the voltage drop.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. The purpose is to provide a method.

In order to solve the above problems and achieve the object, the present invention employs the following aspects.
(1) An internal short-circuit state quantity measuring device according to one aspect of the present invention (for example, the internal short-circuit state quantity measuring device 10 in the embodiment) includes a plurality of A plurality of divisions (e.g., cell 21 in the embodiment) that are modeled as obtained by dividing a cell (e.g., cell 21 in the embodiment) of the cell (e.g., cell 21 in the embodiment a divided body 11), a closed circuit electrically connecting the plurality of divided bodies (for example, a closed circuit 12 in the embodiment), and a calorific value sensor provided in each of the plurality of divided bodies (for example, a heat quantity sensor 15) in the form, a current sensor (for example, the current sensor 13 in the embodiment) provided between two suitable divided bodies adjacent to each other in the closed circuit, and one of the plurality of divided bodies and a shorting member (eg, shorting member 17 in the embodiment) for shorting one.

(2) An internal short-circuit state quantity measuring device according to an aspect of the present invention (for example, the internal short-circuit state quantity measuring device 10 in the embodiment) is obtained by dividing a plurality of assembled batteries forming a battery module. A plurality of divided bodies (for example, divided body 11 in the embodiment) consisting of a plurality of assembled batteries modeled as shown, and a closed circuit that electrically connects the plurality of assembled batteries (for example, in the embodiment a closed circuit 12), a calorie sensor (for example, the calorie sensor 15 in the embodiment) provided in each of the divided bodies, and a current sensor provided between two appropriate adjacent divided bodies in the closed circuit (For example, the current sensor 13 in the embodiment) and a short-circuiting member (for example, the short-circuiting member 17 in the embodiment) that short-circuits any one of the plurality of divided bodies.

(3) The internal short-circuit state quantity measuring device according to (1) or (2) above may include a voltage sensor (for example, the voltage sensor 14 in the embodiment) provided in each of the plurality of divided bodies. good.

(4) The internal short-circuit state quantity measuring device according to any one of (1) to (3) above includes a temperature sensor (for example, a temperature sensor in the embodiment) provided on each surface of the plurality of divided bodies. sensor 18) and a heat flow measuring unit (for example, the processing device 19 in the embodiment) that measures the heat flow based on the temperature detected by the temperature sensor.

(5) In the internal short-circuit state quantity measuring device according to any one of (1) to (4) above, the plurality of divided bodies may have a capacity ratio corresponding to a short-circuit position.

(6) In the internal short-circuit state quantity measuring device according to any one of (1) to (5) above, the current sensor may be a non-contact current sensor.

(7) In the internal short-circuit state quantity measuring device according to any one of (1) to (6) above, the short-circuit member causes a short-circuit by penetrating any one of the plurality of divided bodies. may

(8) In the internal short-circuit state quantity measuring device described in (7) above, the short-circuiting member is a rod-shaped member inserted so as to penetrate any one of the plurality of divided bodies (for example, It may be a short circuit member 17).

(9) In the internal short-circuit state quantity measuring device according to any one of (1) to (8) above, a heat insulating member (for example, the A heat insulating member 16) may be provided.

(10) A method for measuring an internal short-circuit state quantity according to an aspect of the present invention includes: A step of obtaining an internal short-circuit current (e.g., internal short-circuit current Is in the embodiment) locally flowing in the short-circuited division body (e.g., the short-circuit division body 23 in the embodiment) short-circuited by the short-circuiting member (e.g., the implementation step S02 in the embodiment), and the current sensor detects the current (for example, the first current I1 and the second current I2 in the embodiment) flowing from the plurality of divided bodies other than the short-circuited divided body to the short-circuited divided body by the current sensor. By adding the internal short-circuit current and the current detected by the current sensor, the total current flowing through the short-circuit segment (for example, step S05 in the embodiment) is determined A step of calculating the short-circuit current I) (for example, step S05 in the embodiment), and a step of calculating Joule heat (for example, Joule heat (∫Wj dt) in the embodiment) by the total current (for example, step S06 in the embodiment), and reaction heat ( For example, a step of calculating the heat of chemical reaction (∫Wchem·dt) in the embodiment (for example, step S06 in the embodiment).

(11) A method for measuring an internal short-circuit state quantity according to an aspect of the present invention is a short-circuit division short-circuited by the short-circuit member among the plurality of divided bodies in the internal short-circuit state quantity measuring device according to (3) above. a step (for example, step S01 in the embodiment) of detecting a voltage drop across a body (for example, the short-circuiting divider 23 in the embodiment) by the voltage sensor (for example, step S01 in the embodiment); resistance (e.g., external resistance 32 in the embodiment) and a change over time in the voltage drop across the external resistance detected in a closed circuit (e.g., closed circuit 12 in the embodiment) and the change in the external resistance An internal short circuit of the short circuit division body is detected by a map of the correspondence relationship with the resistance value (for example, the resistance value R in the embodiment) and data on the change in the voltage drop over time detected by the voltage sensor. a step of obtaining a resistance value (for example, step S01 in the embodiment); and a step of calculating an internal short-circuit current Is that locally flows in the body (for example, step S02 in the embodiment).

According to (1) above, the plurality of division bodies are modeled as obtained by dividing a plurality of cells forming a battery. As a result, only the desired number of cells at the desired position of the virtual battery can be short-circuited independently and accurately. For example, in the case of a battery formed by stacking a plurality of cells, it is possible to short-circuit only the desired number of cell layers at each position in the in-plane direction and the stacking direction. Furthermore, the capacity, thickness, surface area, volume, density, etc. of the short-circuited cell can be arbitrarily set, and a short-circuit test with good reproducibility can be performed.
Furthermore, by providing a current sensor arranged between adjacent split bodies, it is possible to detect the current flowing from the other split body to the short-circuited split body. Furthermore, by providing a calorific value sensor provided in each divided body, it is possible to detect the total amount of heat generated in the short-circuited divided body.
As a result, the state quantity of the battery at the time of internal short circuit can be accurately reproduced, and the heat generation phenomenon caused by the internal short circuit can be accurately measured.

According to (2) above, the plurality of divided bodies are modeled as obtained by dividing a plurality of assembled batteries forming a battery module. As a result, only the desired number of assembled batteries at desired positions of the virtual battery module can be short-circuited independently and accurately. Furthermore, the capacity, thickness, surface area, volume, density, etc. of the assembled battery to be short-circuited can be arbitrarily set, and a short-circuit test with good reproducibility can be performed.
Furthermore, by providing a current sensor arranged between adjacent split bodies, it is possible to detect the current flowing from the other split body to the short-circuited split body. Furthermore, by providing a calorific value sensor provided in each divided body, it is possible to detect the total amount of heat generated in the short-circuited divided body.
As a result, it is possible to accurately reproduce the state quantity of the battery module at the time of the internal short circuit, and accurately measure the heat generation phenomenon caused by the internal short circuit.

Furthermore, in the case of (3) above, the voltage drop in the short-circuited divided body can be detected by providing a voltage sensor provided for each divided body.

Furthermore, in the case of (4) above, it is possible to measure the heat flow flowing on the boundary surface of the adjacent divided bodies, and to accurately estimate the temperature distribution at the time of the internal short circuit.

Furthermore, in the case of (5) above, an arbitrary short-circuit position can be easily modeled according to the capacity ratio of a plurality of divided bodies (for example, a divided body divided into three).

Furthermore, in the case of (6) above, by providing a non-contact type current sensor, for example, a magnetic field conversion type current sensor, the current can be accurately measured without inserting a resistor.

Furthermore, in the case of (7) above, the desired divided body can be accurately short-circuited with good reproducibility by penetrating the short-circuit member.

Furthermore, in the case of (8) above, the rod-shaped member can accurately penetrate the desired divided body and short-circuit with good reproducibility.

Furthermore, in the case of (9) above, by providing a heat insulating member provided in each split body, it is possible to improve the detection accuracy of the total amount of heat generated in the short-circuited split body.

According to (10) above, the Joule heat is calculated from the total current flowing through the short-circuit divided body, and the reaction heat is calculated by subtracting the Joule heat from the heat amount of the short-circuit divided body detected by the calorific value sensor. As a result, in the total heat amount at the time of internal short circuit, it is possible to distinguish between Joule heat and reaction heat such as heat generated by internal combustion and decomposition, and to understand the short circuit characteristics and short circuit behavior at the time of internal short circuit in detail. can be analyzed.

According to (11) above, based on the fact that the equivalent circuit is the same for the internal short circuit and the external short circuit, a map of the correspondence relationship between the voltage drop of the external resistance and the resistance value obtained in advance by storage or measurement is referred to. to obtain the internal short circuit resistance value corresponding to the voltage drop detected at the time of internal short circuit. As a result, even if it is not possible to directly detect the appropriate internal resistance value and internal short-circuit resistance value at the time of an internal short circuit, irregular internal An appropriate internal short circuit resistance value can be indirectly obtained based on the voltage behavior including the change of state.
Moreover, the accuracy of Joule heat calculation can be improved by using the internal short-circuit current calculated based on the internal short-circuit resistance value.

1 is a diagram schematically showing the configuration of an internal short-circuit state quantity measuring device according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view schematically showing a battery virtually configured by a plurality of divided bodies in the internal short-circuit state quantity measuring device according to the embodiment of the present invention; The figure which shows the equivalent circuit which becomes the same in the internal short circuit and external short circuit of the short circuit divided body in the measuring method of the internal short circuit state quantity which concerns on embodiment of this invention. A graph showing an example of the correspondence relationship between the time change of the voltage drop in the external resistance of the short-circuit divided body and the resistance value of the external resistance acquired by the internal short-circuit state quantity measuring device according to the embodiment of the present invention. A graph showing an example of a correspondence relationship between the voltage drop speed in the external resistance of the short-circuit divided body and the resistance value of the external resistance, which is acquired by the internal short-circuit state quantity measuring device according to the embodiment of the present invention. FIG. 4 is a cross-sectional view showing a short-circuit member and a plurality of cylindrical body regions of a cylindrical heat transfer model in a method for measuring an internal short-circuit state quantity according to an embodiment of the present invention; FIG. 4 is a graph showing an example of temperature data (temperature change data of a plurality of cylindrical body regions) acquired by a cylindrical heat transfer model in the method for measuring the internal short-circuit state quantity according to the embodiment of the present invention; A graph showing an example of the correspondence relationship between the discharge capacity and the test temperature obtained by the discharge test of the short-circuit divided body in the method for measuring the internal short-circuit state quantity according to the embodiment of the present invention. A graph showing an example of the correspondence relationship between the internal resistance value, the temperature, and the capacity of the short-circuit divided body in the method for measuring the internal short-circuit state quantity according to the embodiment of the present invention. A graph showing an example of the correspondence relationship between the electromotive force and capacity of the short-circuit divided body in the method for measuring the internal short-circuit state quantity according to the embodiment of the present invention. 4 is a flowchart of a method for measuring an internal short-circuit state quantity according to an embodiment of the present invention; A graph showing an example of changes over time in the terminal voltage of the short-circuited divided body and the heat flow of each divided body, which are acquired by the internal short-circuit state quantity measuring device according to the embodiment of the present invention. A graph showing an example of changes over time in the terminal voltage of the short-circuited divided body and the current flowing from each divided body to the short-circuited divided body, which are acquired by the internal short-circuit state quantity measuring device according to the embodiment of the present invention. A graph showing an example of changes over time in the terminal voltage of the short-circuited divided body and the temperature of the short-circuiting member and each divided body, which are acquired by the internal short-circuit state quantity measuring device according to the embodiment of the present invention.

An embodiment of an internal short-circuit state quantity measuring apparatus and measuring direction of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a diagram schematically showing the configuration of an internal short-circuit state quantity measuring device according to an embodiment. FIG. 2 is a cross-sectional view schematically showing a battery virtually configured by a plurality of divided bodies in the internal short-circuit state quantity measuring device according to the embodiment.
As shown in FIG. 1, an internal short-circuit state quantity measuring device 10 includes a plurality of divided bodies 11, a closed circuit 12, a plurality of current sensors 13, a plurality of voltage sensors 14, a plurality of heat quantity sensors 15, A plurality of heat insulating members 16 , a short circuit member 17 , a plurality of temperature sensors 18 and a processing device 19 are provided.

The plurality of divided bodies 11 includes, for example, a plurality of cells 21 that constitute a virtual battery 20 shown in FIG. The plurality of divided bodies 11 are modeled as obtained by dividing the plurality of cells 21 stacked in the battery 20 in the stacking direction S. As shown in FIG.
The plurality of split bodies 11 are, for example, three split bodies 11 . The three divided bodies 11 are a first divided body 22, a second divided body 23, and a third divided body 24 which are sequentially arranged in the stacking direction S in the virtual battery 20. FIG. Among the three divided bodies 11 , for example, the second divided body 23 is a short-circuit divided body that is short-circuited by the short-circuit member 17 .
The initial capacity of each of the plurality of divisions 11 is known, and based on the ratio of the initial capacity of the short-circuited division 11 and the initial capacity of the other divisions 11, in the thickness direction of the virtual battery 20 A short-circuit position is set.

Each of the plurality of cells 21 is, for example, a laminate cell. Each cell 21 contains, for example, an electrolyte layer composed of a separator and an electrolytic solution, a positive electrode plate and a negative electrode plate sandwiching the electrolyte layer from both sides in the thickness direction, and a laminate composed of the electrolyte layer, the positive electrode plate and the negative electrode plate. and a case made of a laminated film that
Each divided body 11 includes one cell 21 or a plurality of cells 21 stacked in the thickness direction and electrically connected in parallel.
The closed circuit 12 connects the first divided body 22, the second divided body (short-circuited divided body) 23, and the third divided body 24 to the electrical connection (series connection or parallel connection) assumed in the virtual battery 20. (e.g., connection). The closed circuit 12 connects each split body 11 with a material (for example, a metal such as Al, Cu, Ag) having higher conductivity than each split body 11 .

A plurality of current sensors 13 are provided between two suitable divided bodies 11 adjacent to each other in the closed circuit 12 . Each current sensor 13 is, for example, a non-contact current sensor. For example, a non-contact current sensor that uses a magnetic field-current conversion element such as a Hall element does not require a resistor to be inserted in the circuit, and even if the short-circuit current is large, the current can be accurately detected. can be measured. For example, the multiple current sensors 13 are a first current sensor 13a and a second current sensor 13b.
The first current sensor 13 a is arranged between the first divided body 22 and the short-circuit divided body 23 . The first current sensor 13a detects a current (first current) I1 that flows from the first split body 22 to the short-circuit split body 23 when the short-circuit split body 23 is short-circuited.
The second current sensor 13 b is arranged between the third divided body 24 and the short-circuit divided body 23 . The second current sensor 13b detects a current (second current) I2 that flows from the third divided body 24 to the short-circuited divided body 23 when the short-circuited divided body 23 is short-circuited.

A plurality of voltage sensors 14 are provided on a plurality of divided bodies 11 . For example, the plurality of voltage sensors 14 are a first voltage sensor 14a, a second voltage sensor 14b and a third voltage sensor 14c.
The first voltage sensor 14 a is connected to the first split body 22 . The first voltage sensor 14 a detects the terminal voltage V<b>1 of the first divided body 22 .
The second voltage sensor 14 b is connected to the short-circuit split body 23 . The second voltage sensor 14b detects the terminal voltage V2 of the short-circuit segment 23. As shown in FIG.
The third voltage sensor 14 c is connected to the third split body 24 . The third voltage sensor 14c detects the terminal voltage V3 of the third divided body 24. FIG.

Each of the plurality of heat quantity sensors 15 is a heat flow sensor including, for example, a thermopile or a Peltier element. A plurality of calorie sensors 15 are provided on a plurality of divided bodies 11 . For example, the multiple calorie sensors 15 are a first calorie sensor 15a, a second electrocalorie sensor 15b, and a third calorie sensor 15c.
The first calorific value sensor 15 a is a calorimeter for relatively low temperatures, for example, including a thermopile, and is arranged on the surface of the first divided body 22 . The second calorific value sensor 15 b is a calorimeter for relatively high temperatures, for example, having a Peltier element, and is arranged on the surface of the short-circuit split body 23 . The third calorific value sensor 15 c is a calorimeter for relatively low temperatures, for example, having a thermopile, and is arranged on the surface of the third divided body 24 .

A plurality of heat insulating members 16 are arranged so as to surround each of the plurality of split bodies 11, and maintain each split body 11 independently in a heat insulating state. For example, the plurality of heat insulating members 16 are arranged on the surface of each divided body 11 excluding the calorimeter installation surface and between any two adjacent divided bodies 11 .
The short-circuit member 17 is, for example, a nail-like member that penetrates the short-circuit divided body 23 in the thickness direction to internally short-circuit the short-circuit divided body 23 . The short circuit member 17 includes a temperature sensor 17a such as a thermocouple.

Each of the plurality of temperature sensors 18 is, for example, a contact temperature sensor such as a thermocouple, a thermistor, or a resistance temperature detector. A plurality of temperature sensors 18 are arranged in each of the plurality of divided bodies 11 . The plurality of temperature sensors 18 are arranged, for example, on the surface of each divided body 11 on which the calorific value sensor 15 is arranged and the surface on which the heat insulating member 16 is arranged. The surface on which the plurality of temperature sensors 18 are arranged in each divided body 11 includes, for example, the virtual divided surface of each divided body 11 shown in FIG. The virtual dividing planes are, for example, the boundary plane between the first divided body 22 and the second divided body 23 and the boundary plane between the second divided body 23 and the third divided body 24 shown in FIG.

The processing device 19 functions when a predetermined program is executed by a processor such as a CPU (Central Processing Unit). The processing device 19 includes a processor such as a CPU (Central Processing Unit), a ROM (Read Only Memory) for storing programs, a RAM (Random Access Memory) for temporarily storing data, and electronic circuits such as a timer. At least part of the processing device 19 may be an integrated circuit such as LSI (Large Scale Integration).
The processing device 19 executes a process for measuring an internal short-circuit state quantity, which will be described later, based on signals of detection values output from each current sensor 13, each voltage sensor 14, each calorie sensor 15, and temperature sensor 17a. Further, the processing device 19 may drive and control the short circuit member 17 by controlling an appropriate drive mechanism.

The internal short-circuit state quantity measuring device 10 according to the present embodiment has the above configuration. Next, the operation of the internal short-circuit state quantity measuring device, that is, the internal short-circuit state quantity measuring method will be described.

<Acquisition of internal short-circuit resistance value Rs>
A method of obtaining the internal short-circuit resistance value Rs of the short-circuited divided body 23 short-circuited by the short-circuit member 17 (the resistance value Rs of the internal short-circuit resistance 31) will be described below.
FIG. 3 is a diagram showing an equivalent circuit that is the same in the internal short circuit and the external short circuit of the short-circuit divided body 23 in the measuring method of the internal short-circuit state quantity according to the embodiment. FIG. 4 shows an example of the correspondence relationship between the time change of the voltage drop across the external resistor 32 of the short-circuit divided body 23 and the resistance value R of the external resistor 32 acquired by the internal short-circuit state quantity measuring device 10 according to the embodiment. It is a graph diagram. FIG. 5 is a graph showing an example of the correspondence relationship between the voltage drop speed in the external resistor 32 of the short-circuit divided body 23 and the resistance value R of the external resistor 32 acquired by the internal short-circuit state quantity measuring device 10 according to the embodiment. is.

The internal short-circuit resistance value Rs of the short-circuit divided body 23 internally short-circuited by the short-circuit member 17 varies depending on, for example, the temperature, area and contact resistance of the short-circuited portion. The processing device 19 acquires the internal short-circuit resistance value Rs of the short-circuited divided body 23 internally short-circuited by the short-circuit member 17 based on the terminal voltage V2 of the short-circuited divided body 23 detected by the second voltage sensor 14b. The processing unit 19 acquires the internal short-circuit resistance value Rs by referring to a pre-stored map of short-circuit resistance values and voltage drops, based on the data on the time change of the voltage drop due to the terminal voltage V2 of the short-circuit divided body 23. . The map of the short-circuit resistance value and the voltage drop stored in advance shows the correspondence relationship between the resistance value R of the external resistor 32 connected to the short-circuit dividing body 23 and the change of the voltage drop in the external resistor 32 according to the elapsed time. is a map.

The processing device 19 acquires a map of the short-circuit resistance value and the voltage drop in the short-circuit partition 23, assuming that the internal short-circuit and the external short-circuit of the short-circuit partition 23 have the same equivalent circuit.
As shown in FIG. 3, the processing device 19 converts the equivalent circuit of the short-circuited divided body 23 internally short-circuited by the short-circuit member 17 to Configure. The processing device 19 configures an equivalent circuit of the shorted divided body 23 externally short-circuited by the external resistor 32 by the electromotive force E of the shorted divided body 23 , the external resistance 32 and the internal resistance 33 . That is, the processor 19 considers the resistance value (internal short-circuit resistance value) Rs of the internal short-circuit resistance 31 and the resistance value R of the external resistance 32 to be the same.

The processing device 19 measures the voltage drop of the external resistor 32 based on the terminal voltage V2 detected by the second voltage sensor 14b each time the resistance value R of the external resistor 32 is appropriately changed during measurement for map acquisition. to measure As shown in FIG. 4, for example, as the resistance value R of the external resistor 32 increases from the first resistance value R1 to the third resistance value R2, the voltage drop speed of the external resistor 32 tends to decrease. As shown in FIG. 5, the processing device 19 acquires a map of the correspondence relationship between the short-circuit resistance value (resistance value R of the external resistor 32) and the voltage drop speed in the short-circuit divided body 23, and stores it in the ROM or the like.

The processing device 19 measures the voltage drop across the internal short-circuit resistor 31 based on the terminal voltage V2 detected by the second voltage sensor 14b when measuring the voltage drop across the short-circuited divided body 23 internally short-circuited by the short-circuiting member 17 . Based on the data of the voltage drop of the internal short-circuit resistor 31, the processing unit 19 refers to the map of the correspondence relationship between the short-circuit resistance value (resistance value R of the external resistor 32) and the voltage drop rate, and determines the voltage of the internal short-circuit resistor 31. Get the short circuit resistance value corresponding to the drop. The processing device 19 sets the short-circuit resistance value acquired from the map as the internal short-circuit resistance value Rs.

<Calculation of internal short-circuit current Is>
A method of calculating the internal short-circuit current Is that locally flows through the short-circuited divided body 23 internally short-circuited by the short-circuit member 17 will be described below.
The processing device 19 calculates the internal short-circuit current Is flowing through the short-circuit divided body 23 internally short-circuited by the short-circuit member 17 based on the following formula (2). In the following formula (2), the internal short-circuit current Is is described by the electromotive force E of the short-circuit segment 23, the internal resistance value Ri, and the internal short-circuit resistance value Rs. The electromotive force E at the time of an internal short circuit of the short circuit segment 23 is obtained based on the remaining capacity and temperature of the short circuit segment 23 as will be described later. The internal resistance value Ri of the short circuit segment 23 is obtained based on the remaining capacity and temperature of the short circuit segment 23, as will be described later.

For example, when sequentially calculating the internal short-circuit current Is, the processing device 19 uses the internal short-circuit resistance value _Rsn acquired in the current process and the current electromotive force E acquired in the previous process as described later. The current internal short-circuit current Is _n is calculated based on _n and the internal resistance Ri _n .

<Calculation of Dischargeable Capacity Qeff>
A method for calculating the dischargeable capacity Qeff of the short-circuited divided body 23 short-circuited by the short-circuit member 17 will be described below.
FIG. 6 is a cross-sectional view showing the short-circuit member 17 and a plurality of cylindrical body regions of the cylindrical heat transfer model in the method for measuring the internal short-circuit state quantity according to the embodiment. FIG. 7 is a graph showing an example of temperature data (temperature change data of a plurality of cylindrical regions) acquired by a cylindrical heat transfer model in the method for measuring the internal short-circuit state quantity according to the embodiment. FIG. 8 is a graph showing an example of the correspondence relationship between the discharge capacity and the test temperature obtained by the discharge test of the short circuit segment 23 in the internal short circuit state quantity measuring method according to the embodiment.

The processing device 19 acquires data (temperature data) of changes in internal temperature over time using a cylindrical heat transfer model for the short-circuited divided body 23 short-circuited by the short-circuit member 17 . As shown in FIG. 6 , the cylindrical heat transfer model models the short-circuit split body 23 short-circuited by the short-circuit member 17 as a cylindrical body 40 centered on the short-circuit member 17 . The volume of the cylindrical body 40 is the same as the volume of the short-circuit segment 23 . The cylinder 40 is segmented into a plurality of concentric cylinder regions. The radial thickness H of each of the multiple cylindrical regions is the same. The plurality of cylindrical body regions include a short-circuit region 41 in contact with the short-circuit member 17 and a plurality of cylindrical bodies 42(1), . Prepare. Note that m is a predetermined natural number. The short-circuit region 41 generates heat due to the short-circuit. The heat generated in the short-circuit region 41 is transferred to the short-circuit member 17 and the plurality of cylindrical bodies 42(1), . . . , 42(m).

The processor 19 calculates the amount of heat Pp transferred from the short-circuit region 41 to the short-circuit member 17 based on the temperature Tp of the short-circuit member 17 detected by the temperature sensor 17a and the following formula (2). In the following formula (3), the temperature Tp of the short-circuit member 17 is the amount of heat Pp transferred from the short-circuit region 41 to the short-circuit member 17, the time interval Δt, the specific heat Cp of the short-circuit member 17, and the weight of the short-circuit member 17. Mp.

The processing device 19 calculates the temperature Ts of the short-circuit region 41 based on the calculated amount of heat Pp and the following formula (4). In the following formula (4), the amount of heat Pp transferred from the short-circuit region 41 to the short-circuit member 17 is a predetermined natural number m, the thermal conductivity λs of the short-circuit region 41, the temperature Ts, the radial thickness H, and the radius Ls. , and the radius Lp of the short-circuit member 17 .

The processor 19 describes the amount of heat P1 transferred from the short circuit region 41 to the first cylindrical body 42( ₁ ) as shown in the following formula (5). In the following formula (5), the heat quantity P1 is _a predetermined natural number m, the thermal conductivity λs of the short-circuit region 41, the temperature Ts, the radial thickness H and the radius Ls, and the first cylindrical body 42(1) is described by the temperature T ₁ , radial thickness H and radius Ls ₁ of the second cylinder 42(2) and the temperature T ₂ and radius Ls ₂ of the second cylinder 42(2).

The processor 19 describes the amount of heat _Pk transferred from the short-circuit region 41 to the k-th cylindrical body 42(k) as shown in the following formula (6). Note that k is an arbitrary natural number equal to or greater than 2 and equal to or less than (m−1). In the following formula (6), the heat quantity P _k is a predetermined natural number m, the thermal conductivity λs of the short-circuit region 41, the temperature T _k-1 of the k-1-th cylindrical body 42 (k-1), and the radius Ls _k−1 , the temperature T _k , the radial thickness H and the radius Lsk of the _kth cylinder 42(k), and the temperature Tk ₊₁ and the radius Lsk _{+1 of the k+} 1th cylinder 42(k+1). ing.

The processor 19 describes the temperature Tj of the _j -th cylindrical body 42(j) as shown in the following formula (7). Note that j is an arbitrary natural number equal to or less than a predetermined natural number m. Note that in the following formula (7), the temperature Tj is the amount of heat Pj transferred from the short-circuit region 41 to the _j -th cylindrical body 42( _j ), the time interval Δt, and the j-th cylindrical body 42(j). is described by the specific heat Cc and weight Ms of

The processing device 19 uses the above formulas (3) to (7), the temperature Tp of the short-circuiting member 17 detected by the temperature sensor 17a provided on the short-circuiting member 17, and the temperature Tp detected by the temperature sensor (not shown). The temperature Tj of the _j -th cylindrical body 42(j) is calculated sequentially from the inner peripheral side to the outer peripheral side of the cylindrical body 40 using the detected surface temperature of the short-circuit segment 23.

The processing unit 19 uses the above formulas (5) to (7), the detected value of the surface temperature of the short-circuit divided body 23 detected by a temperature sensor (not shown), and the temperature sensor 17a provided on the short-circuit member 17. and the temperature _Tp of the short-circuiting member 17 detected by good too.
In this case, first, the processing device 19 uses the detected value of the surface temperature of the short-circuit divided body 23 as the temperature _Tm of the m-th cylindrical body 42 (m), which is the outermost layer of the cylindrical body 40, in the above equation (7). By using this, the amount of heat Pm transferred from the short-circuit region 41 to the m-th cylindrical body 42( _m ) is calculated.
Next, the processing device 19 _determines the temperature _{T m -1} is calculated. Then, based on the temperature T _m−1 and the above formula (7), the processing device 19 determines the heat amount P _{m− 1} is calculated.
Next, the processing device 19 determines the ( _{m -} 2)th cylindrical body 42 ( _m -2 ) is _calculated . Then, based on the temperature T _m−2 and the above formula (7), the processing device 19 determines the heat amount P _{m− 2} is calculated.
The processing device 19 repeats the same process as that for calculating the temperature Tm-2 of the (m-2)th cylindrical body 42 (m-2), thereby calculating the temperature _Tm-2 of the (m-3)th cylindrical body 42 (m-2). , T ₁ are calculated sequentially from 42(m _- 3) toward the first cylindrical body 42(1).

As shown in FIG. 7, the processing device 19 acquires temperature data of changes in the calculated temperatures Tp, Ts, T ₁ , . . . , _Tm over time. For example, in FIG. 7, the temperature Tp of the short circuit member 17 and the temperatures T ₁ , . . . , T ₄ of the first to fourth cylindrical bodies 42(1), . It is recognized that there is an increasing trend.
In the acquired temperature data, the processing device 19 puts a region exceeding a predetermined temperature Ta into a deactivated state in which discharge is impossible. The predetermined temperature Ta is, for example, 120.degree. For example, as shown in FIG. 8, the predetermined temperature Ta is set based on test results obtained by measuring the discharge capacity of the short circuit segment 23 for each test temperature. According to the test results shown in FIG. 8, it is recognized that the discharge capacity decreases toward zero in the temperature range exceeding the predetermined temperature Ta.
The processing device 19 calculates the deactivated capacity Qdead by converting the volume of the deactivated region in the cylindrical body 40 into a capacity. The processing device 19 calculates the dischargeable capacity Qeff by subtracting the deactivation capacity Qdead from the known initial capacity of the short-circuited segment 23 . For example, when the processing device 19 sequentially calculates the dischargeable capacity Qeff, as shown in the following formula (8), the remaining capacity Qn-1 of the short-circuiting divided body 23 from the previous remaining capacity Qn _-1 to this time is newly discharged. The current dischargeable capacity Qeff _n is calculated by subtracting the deactivated capacity Qdead _n . Note that n is an arbitrary natural number.

<Calculation of remaining capacity Q>
A method for calculating the remaining capacity Q of the short-circuited divided body 23 short-circuited by the short-circuit member 17 will be described below.
The processing device 19 calculates the remaining capacity Q by subtracting the discharge capacity from the dischargeable capacity Qeff. For example, when the processing device 19 sequentially calculates the remaining capacity Q, as shown in the following formula (9), the current dischargeable capacity Qeff _n of the short-circuit divided body 23 is newly calculated from the previous time to the current time. The current remaining capacity _Qn is calculated by subtracting the discharge capacity lost due to discharge. A new discharge capacity from the previous time to the current time is calculated by time-integrating the current internal short-circuit current _Isn over the elapsed time t from the previous time to the current time.

<Acquisition of internal resistance value Ri and electromotive force E>
A method of obtaining the internal resistance value Ri and the electromotive force E of the short-circuited divided body 23 short-circuited by the short-circuit member 17 will be described below.
FIG. 9 is a graph showing an example of the correspondence between the internal resistance value, the temperature and the capacity of the short-circuit segment 23 in the method for measuring the internal short-circuit state quantity according to the embodiment. FIG. 10 is a graph showing an example of the correspondence relationship between the electromotive force and capacity of the short-circuit divided body 23 in the method for measuring the internal short-circuit state quantity according to the embodiment.

As shown in FIG. 9, the processing device 19 stores in advance a map showing the correspondence between the internal resistance value, temperature and remaining capacity of the short circuit segment 23 . The map shown in FIG. 9 shows the correspondence between the internal resistance value and temperature in each of the plurality of different remaining capacities Q ₁ , . . . , Q ₈ . For example, in FIG. 9, it can be seen that the internal resistance values of the remaining capacities Q ₁ , . . . , Q ₈ tend to decrease as the temperature increases.
The processing device 19 calculates the internal resistance value and the temperature of the short circuit segment 23 based on the calculated remaining capacity Q of the short circuit segment 23 internally short-circuited by the short circuit member 17 and the detected value of the surface temperature of the short circuit segment 23. and the map of the correspondence relationship between the remaining capacity and the internal resistance value Ri corresponding to the detected value of the remaining capacity Q and the surface temperature is obtained.
For example, when calculating the remaining capacity _Qn successively, the processing device 19 acquires the internal resistance value Rin ₊₁ until the next time based on the remaining capacity _Qn calculated this time.

As shown in FIG. 10, the processing device 19 stores in advance a map of the correspondence between the electromotive force, the temperature and the remaining capacity of the short-circuit segment 23 . The map shown in FIG. 10 shows the correspondence relationship between the electromotive force and the remaining capacity at an appropriate temperature (for example, 25° C.). For example, in FIG. 10, it can be seen that the electromotive force tends to increase as the remaining capacity increases.
The processing device 19 calculates the electromotive force, temperature, The remaining capacity Q and the electromotive force E corresponding to the detected value of the surface temperature are obtained with reference to the map of the correspondence relationship of the remaining capacity. In the case where the temperature dependence of the electromotive force and the remaining capacity can be ignored, the processing device 19 calculates the electromotive force corresponding to the remaining capacity Q based on the map of the correspondence relationship between the electromotive force and the remaining capacity at an appropriate temperature. You can get E.
For example, when calculating the remaining capacity _Qn successively, the processing device 19 acquires the electromotive force _En+1 until the next time based on the remaining capacity _Qn calculated this time.

<Calculation of Joule heat>
A method of calculating the Joule heat and the heat of chemical reaction of the short-circuited divided body 23 short-circuited by the short-circuit member 17 will be described below.
The processing device 19 detects an internal short-circuit current Is that locally flows through the short-circuit divided body 23 internally short-circuited by the short-circuit member 17, and a first current I1 and a second current I1 detected by the first current sensor 13a and the second current sensor 13b. The short-circuit current I flowing through the short-circuit divided body 23 is calculated by adding the current I2. For example, when the processing device 19 sequentially calculates the short-circuit current I, as shown in the following formula (10), the current internal short-circuit current Is _n of the short-circuit divided body 23, the first current I1 and the second The current short-circuit current In is calculated by adding it to the current _I2 .

The processing device 19 integrates the terminal voltage V2 of the short-circuited segment 23 detected by the second voltage sensor 14b and the short-circuit current I over a predetermined period of time, and integrates the work Wj over a predetermined period of time to generate Joule heat ( ∫Wj·dt) is calculated.
The processing device 19 calculates the amount of heat generation (∫Wc·dt) by time-integrating the amount of heat Wc of the short-circuited divided body 23 detected by the second heat sensor 15b over a predetermined period of time.
The processing device 19 converts the Joule heat (∫Wj dt) from the calorific value (∫Wc dt) based on the Joule heat (∫Wj dt), the calorific value (∫Wc dt), and the following formula (11). The heat of chemical reaction (∫Wchem·dt) obtained by subtracting is calculated.

<Method for measuring internal short-circuit state quantity>
A method for sequentially measuring the internal short-circuit state quantity of the short-circuited divided body 23 short-circuited by the short-circuit member 17 will be described below.
FIG. 11 is a flowchart of a method for measuring an internal short-circuit state quantity according to the embodiment. The processing device 19 repeatedly executes a series of processes from step S01 to step S08 at predetermined time intervals. The predetermined time is, for example, approximately 1 ms to 10 ms.
First, in step S01, the processing device 19 calculates a pre-stored short-circuit resistance value and a voltage drop speed based on the data of the voltage drop speed due to the terminal voltage V2 of the short-circuit divided body 23 detected by the second voltage sensor 14b. By referring to the map, the internal short-circuit resistance value _Rsn of the short-circuit divided body 23 in the current process is acquired.

Next, in step S02, the processing device 19 extracts the electromotive force _En and the internal resistance value Rin of the short-circuit segment 23 obtained in the previous process, the internal short-circuit resistance value _Rsn calculated in step _S01 , and the above formula Based on (2), the internal short-circuit current _Isn in the current process is calculated.
Next, in step S03, based on the temperature data obtained by the cylindrical heat transfer model, the processing device 19 determines whether the cylinder 40 is in a deactivated state exceeding a predetermined temperature Ta from the previous processing to the current processing. Get a region. The processing device 19 calculates the deactivation capacity Qdead _n of the short-circuit segment 23 in the current process by converting the volume of the newly deactivated region into a capacity. The processor 19 subtracts the current deactivation capacity Qdead _n from the remaining capacity Q _n−1 calculated in the previous process to calculate the dischargeable capacity Qeff _n of the short-circuit segment 23 in the current process.

Next, in step S04, the processing device 19 calculates the discharge capacity by time-integrating the internal short-circuit current _Isn calculated in step S02 over the elapsed time t from the previous processing to the current processing. The processing device 19 calculates the current remaining capacity _Qn by subtracting the discharge capacity from the dischargeable capacity _Qeffn calculated in step S03.
Next, in step S05, the processing device 19 calculates the internal short-circuit current _Isn calculated in step S02, and the first current I1 and the second current I2 detected by the first current sensor 13a and the second current sensor 13b. By adding, the short-circuit current I _n flowing through the short-circuit divided body 23 is calculated.

Next, in step S06, the processing device 19 calculates the work _Wjn obtained by integrating the terminal voltage V2 of the short-circuit divided body 23 detected by the second voltage sensor 14b and the short-circuit current In over a _{predetermined} period of time. Joule heat (∫Wj _n ·dt) is calculated by time integration. In addition, the processing device 19 calculates the amount of heat generation (∫Wc _n ·dt) by time-integrating the amount of heat Wc _n of the short circuit divided body 23 detected by the second heat sensor 15b over a predetermined period of time.
The processing device 19 calculates the heat of chemical reaction (∫Wchem _{n·dt) by subtracting the Joule heat (∫Wj n ·} dt) from the amount of heat generated (∫Wc _n ·dt).

Next, in step S07, the processing device 19 determines whether or not the remaining capacity Qn calculated in step _S04 is equal to or less than a predetermined capacity. The predetermined capacity is, for example, zero.
If the determination result is "YES", the processor 19 advances the process to the end. On the other hand, if the determination result is "NO", the processing device 19 advances the process to step S08.
Next, in step S08, the processing device 19 responds to the internal resistance value, temperature, and remaining capacity of the short circuit segment 23 based on the detected value of the surface temperature of the short circuit segment 23 and the remaining capacity _Qn calculated in step S04. By referring to the relationship map, the internal resistance value Rin ₊₁ until the next processing is obtained. In addition, the processing device 19 refers to the map of the correspondence between the electromotive force, the temperature and the remaining capacity of the short circuit segment 23 based on the detected value of the surface temperature of the short circuit segment 23 and the remaining capacity _Qn calculated in step S04. Thus, the electromotive force E _n+1 until the next processing is obtained. Then, the processing device 19 returns the processing to step S01.

<Calculation of heat flow>
A method of calculating the heat flow during an internal short circuit based on the temperature of the surface of each divided body 11 detected by a plurality of temperature sensors 18 will be described below.
The processing device 19 calculates the heat flow in each divided body 11 based on the temperature detection values output from the plurality of temperature sensors 18 . For example, in the case of the virtual battery 20 shown in FIG. , the flow direction and heat flow of the heat generated in the short circuit segment 23 are obtained based on the outputs of the plurality of temperature sensors 18 .

<Example>
An embodiment of the internal short-circuit state quantity measuring device 10 will be described below.
FIG. 12 shows an example of changes over time in the terminal voltage V2 of the short circuit divided body 23 and the heat flows of the divided bodies 22, 23, and 24 obtained by the internal short circuit state quantity measuring device 10 according to the embodiment. FIG. 10 is a graph diagram showing FIG. FIG. 13 shows the time course of the terminal voltage V2 of the short-circuited divided body 23 and the currents I1 and I2 flowing from the divided bodies 22 and 24 to the short-circuited divided body 23, which are obtained by the internal short-circuit state quantity measuring device 10 according to the embodiment. It is a graph diagram showing an example of a change according to. FIG. 14 shows the terminal voltage V2 of the short-circuit divided body 23 and the temperatures of the short-circuit member 17 and the divided bodies 22, 23, and 24 acquired by the internal short-circuit state quantity measuring device 10 according to the embodiment. It is a graph chart showing an example of change.

The internal short-circuit state quantity measuring device 10 of the embodiment includes divided bodies 22, 23, and 24 obtained by dividing a 3 Ah class laminate cell into three 1 Ah class laminate cells. The short circuit member 17 is a needle with a diameter of 3 mm. The example models a state in which 50 layers of cells at the center of a battery (3 Ah class laminate cell) are internally short-circuited.
As shown in FIG. 12, when the short-circuiting segment 23 is internally short-circuited by the short-circuiting member 17 at time t0, the heat quantities of the first segment 22 and the third segment 24 are almost unchanged. It can be seen that the heat flow in the segment 23 changes to an increasing trend.
Further, as shown in FIG. 13, after time t0 when an internal short circuit occurs, the first current I1 and the second current I2 flowing from the first divided body 22 and the third divided body 24 to the short-circuited divided body 23 increase. It is accepted that there are It is recognized that the first current I1 and the second current I2, whichever is easier to flow, is greater depending on a minute difference in internal resistance.
Further, as shown in FIG. 14, after the time t0 when the internal short circuit occurs, the temperature of the short-circuited divided body 23 tends to increase toward an appropriate temperature T2b. It can be recognized that the temperature of the three-part split body 24 does not substantially change so as to maintain the appropriate temperature T1b, and the short-circuit split part 23 serves as a heat source.
For example, the Joule heat Wj0 due to the first current I1a and the second current I2a at the time ta shown in FIG.

As described above, according to the internal short-circuit state quantity measuring device 10 of the present embodiment, the plurality of divided bodies 11 are modeled as if they were obtained by dividing the plurality of stacked cells 21 in the stacking direction. It is As a result, only the desired number of cell layers at desired positions (each position in the in-plane direction and stacking direction) of the virtual battery 20 can be short-circuited independently and accurately. Furthermore, the capacity, thickness, surface area, volume, density, etc. of the short-circuited cell 21 can be arbitrarily set, and a short-circuit test with good reproducibility can be performed.
Furthermore, by providing the current sensor 13 arranged between the adjacent split bodies 11, the first current I1 and the second current I2 flowing from the other first and third split bodies 22 and 24 to the short circuit split body 23 can be detected. Furthermore, by providing the calorie sensor 15 provided in each split body 11, the amount of heat generated in the short circuit split body 23 can be detected.
As a result, the state quantity of the virtual battery 20 at the time of internal short circuit can be accurately reproduced, and the heat generation phenomenon caused by the internal short circuit can be accurately measured.

Furthermore, by providing the voltage sensor 14 provided in each division 11, the voltage drop of the short circuit division 23 can be detected.
Furthermore, it is possible to measure the heat flow flowing through the virtual boundary surface of the adjacent divided bodies 11, and to accurately estimate the temperature distribution at the time of the internal short circuit.
Furthermore, since the short-circuit positions are set according to the capacity ratios of the plurality of divided bodies 11 (for example, the divided bodies 11 divided into three), arbitrary short-circuit positions can be easily modeled.
Furthermore, by providing a non-contact type current sensor, for example, a magnetic field conversion type current sensor 13, it is possible to accurately measure the current without inserting a resistor.
Further, by penetrating the short-circuiting member 17, the desired divided body 11 can be short-circuited accurately with good reproducibility.
Furthermore, by providing the rod-shaped short-circuiting member 17, it is possible to accurately penetrate the divided bodies 11 corresponding to the desired number of cell layers and to short-circuit with good reproducibility.
Furthermore, by providing the heat insulating member 16 provided in each split body 11, the detection accuracy of the amount of heat generated in the short-circuit split body 23 can be improved.

Further, according to the method for measuring the internal short-circuit state quantity of the present embodiment, the Joule heat is calculated from the short-circuit current I flowing through the short-circuit divided body 23, and the Joule heat is calculated from the heat amount of the short-circuit divided body 23 detected by the heat quantity sensor 15. Calculate the heat of chemical reaction by subtracting As a result, it is possible to distinguish between Joule heat and chemical reaction heat such as heat generated by internal combustion and decomposition in the amount of heat at the time of an internal short circuit, and to understand the short circuit characteristics and short circuit behavior at the time of an internal short circuit in detail. can be analyzed.

Furthermore, based on the fact that the equivalent circuit is the same for the internal short circuit and the external short circuit, referring to a map of the correspondence relationship between the voltage drop of the external resistor 32 and the resistance value R obtained in advance by storage or measurement, the internal short circuit An internal short-circuit resistance value Rs corresponding to the detected voltage drop is obtained. As a result, even if the proper internal resistance value Ri and internal short-circuit resistance value Rs at the time of an internal short circuit cannot be directly detected, an irregular resistance corresponding to heat generation at the time of an internal short circuit or damage due to generated gas can be detected. An appropriate internal short-circuit resistance value Rs can be obtained indirectly based on the voltage behavior including changes in internal states.
Moreover, the accuracy of Joule heat calculation can be improved by using the internal short-circuit current Is calculated based on the internal short-circuit resistance value Rs.

Modifications of the above embodiment will be described below.
In the above-described embodiment, the plurality of divided bodies 11 are modeled as obtained by dividing the plurality of cells 21 stacked in the battery 20 in the stacking direction S, but this is not the only option. not. The plurality of cells 21 may form the battery 20 in an arrangement other than the stacked arrangement.
Alternatively, the plurality of divided bodies 11 may be modeled as obtained by dividing a plurality of assembled batteries forming a battery module. In this case, for example, in FIGS. 1 and 2 described above, the cell 21 may be an assembled battery and the battery 20 may be a battery module.
In the above-described embodiment, the heat insulating member 16 is arranged on one surface of each divided body 11, but this is not a limitation, and two heat insulating members 16 sandwiching each divided body 11 from both sides in the thickness direction are provided. You may prepare.

Embodiments of the invention are provided by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 10... Device for measuring internal short-circuit state quantity, 11... Divided body, 12... Closed circuit, 13... Current sensor, 14... Voltage sensor, 15... Heat sensor, 16... Thermal insulation member, 17... Short circuit member (nail-shaped member), 18 temperature sensor 19 processor 20 battery 21 cell 31 internal short-circuit resistance 32 external resistance 33 internal resistance E electromotive force I1 first current I2 second current , Is... Internal short-circuit current, R... Resistance value, Ri... Internal resistance value, Rs... Internal short-circuit resistance value, Qeff... Dischargeable capacity, Q... Remaining capacity

Claims (12)

a plurality of divisions of cells modeled as obtained by dividing the cells forming the battery;
a closed circuit electrically connecting the plurality of divided bodies;
a calorie sensor provided in each of the plurality of divided bodies;
a current sensor provided between any two of the divided bodies adjacent to each other in the closed circuit; a short-circuiting member that short-circuits any one of the plurality of divided bodies ;
Obtaining an internal short-circuit current that locally flows in a short-circuited divided body among the plurality of divided bodies short-circuited by the short-circuit member, and obtaining a current that flows to the short-circuited divided body from other than the short-circuited divided body among the plurality of divided bodies By adding the internal short-circuit current detected by the current sensor and the current detected by the current sensor, the total current flowing through the short-circuit divided body is calculated, and the Joule heat due to the total current is calculated; a processing unit that calculates reaction heat by subtracting the Joule heat from the heat quantity of the short-circuited divided body detected by the heat quantity sensor;
A measuring device for an internal short-circuit state quantity, comprising: a plurality of divisions composed of a plurality of assembled batteries modeled as obtained by dividing a plurality of assembled batteries forming a battery module;
a closed circuit electrically connecting the plurality of assembled batteries;
a calorie sensor provided in each of the divided bodies;
a current sensor provided between any two of the divided bodies adjacent to each other in the closed circuit; a short-circuiting member that short-circuits any one of the plurality of divided bodies ;
Obtaining an internal short-circuit current that locally flows in a short-circuited divided body among the plurality of divided bodies short-circuited by the short-circuit member, and obtaining a current that flows to the short-circuited divided body from other than the short-circuited divided body among the plurality of divided bodies By adding the internal short-circuit current detected by the current sensor and the current detected by the current sensor, the total current flowing through the short-circuit divided body is calculated, and the Joule heat due to the total current is calculated; a processing unit that calculates reaction heat by subtracting the Joule heat from the heat quantity of the short-circuited divided body detected by the heat quantity sensor;
A measuring device for an internal short-circuit state quantity, comprising: a plurality of divisions of cells modeled as obtained by dividing the cells forming the battery;
a closed circuit electrically connecting the plurality of divided bodies;
a calorie sensor provided in each of the plurality of divided bodies;
a current sensor provided between any two of the divided bodies adjacent to each other in the closed circuit; a short-circuiting member that short-circuits any one of the plurality of divided bodies;
a voltage sensor provided in each of the plurality of divided bodies ;
The voltage sensor detects a voltage drop in a short-circuited divided body among the plurality of divided bodies short-circuited by the short-circuiting member, and detected in a closed circuit including the short-circuited divided body and an external resistor connected to the short-circuited divided body. a map of a correspondence relationship between a change in the voltage drop of the external resistor over time and the resistance value of the external resistor detected by the voltage sensor, and data of a change in the voltage drop over time detected by the voltage sensor; to obtain the internal short-circuit resistance value of the short-circuit segment, and based on the following formula (1) based on the electromotive force E, the internal resistance value Ri, and the internal short-circuit resistance value Rs of the short-circuit segment, local to the short-circuit segment a processing unit that calculates an internal short-circuit current Is that flows
A measuring device for an internal short-circuit state quantity, comprising:

a plurality of divisions composed of a plurality of assembled batteries modeled as obtained by dividing a plurality of assembled batteries forming a battery module;
a closed circuit electrically connecting the plurality of assembled batteries;
a calorie sensor provided in each of the divided bodies;
a current sensor provided between any two of the divided bodies adjacent to each other in the closed circuit; a short-circuiting member that short-circuits any one of the plurality of divided bodies;
a voltage sensor provided in each of the plurality of divided bodies ;
The voltage sensor detects a voltage drop in a short-circuited divided body among the plurality of divided bodies short-circuited by the short-circuiting member, and detected in a closed circuit including the short-circuited divided body and an external resistor connected to the short-circuited divided body. a map of a correspondence relationship between a change in the voltage drop of the external resistor over time and the resistance value of the external resistor detected by the voltage sensor, and data of a change in the voltage drop over time detected by the voltage sensor; to obtain the internal short-circuit resistance value of the short-circuit segment, and based on the following formula (1) based on the electromotive force E, the internal resistance value Ri, and the internal short-circuit resistance value Rs of the short-circuit segment, local to the short-circuit segment a processing unit that calculates an internal short-circuit current Is that flows
A measuring device for an internal short-circuit state quantity, comprising:

a temperature sensor provided on the surface of each of the plurality of divided bodies;
a heat flow measurement unit that measures heat flow based on the temperature detected by the temperature sensor ;
The internal short-circuit state quantity measuring device according to any one of claims 1 to 4 , characterized by comprising: 6. The internal short-circuit state quantity measuring device according to any one of claims 1 to 5 , wherein the plurality of divided bodies have capacity ratios corresponding to short-circuit positions. 7. The internal short-circuit state quantity measuring device according to any one of claims 1 to 6 , wherein the current sensor is a non-contact current sensor. 8. The internal short-circuit state quantity measuring device according to any one of claims 1 to 7 , wherein the short-circuit member is short-circuited by penetrating any one of the plurality of divided bodies. 9. The internal short-circuit state quantity measuring device according to claim 8 , wherein the short-circuit member is a rod-shaped member that is inserted so as to penetrate through any one of the plurality of divided bodies. 10. The internal short-circuit state quantity measuring device according to claim 1, further comprising a heat insulating member that maintains each of the plurality of divided bodies in a heat insulating state. obtaining an internal short-circuit current that locally flows in a short-circuit divided body short-circuited by the short-circuit member among the plurality of divided bodies in the internal short-circuit state quantity measuring device according to claim 1 or 2 ;
a step of detecting, by the current sensor, a current flowing through the short-circuited divided body from among the plurality of divided bodies other than the short-circuited divided body;
calculating a total current flowing through the short-circuit segment by adding the internal short-circuit current and the current detected by the current sensor;
calculating Joule heat due to the total current;
and calculating reaction heat by subtracting the Joule heat from the heat quantity of the short-circuited divided body detected by the heat quantity sensor. a step of detecting, by the voltage sensor, a voltage drop in a short-circuited divided body short-circuited by the short-circuiting member among the plurality of divided bodies in the internal short-circuit state quantity measuring device according to claim 3 or 4 ;
A map of a correspondence relationship between a change over time in the voltage drop of the external resistor detected in a closed circuit comprising the short-circuited segment and an external resistor connected to the short-circuited segment and the resistance value of the external resistor. and obtaining an internal short-circuit resistance value of the short-circuit partition from the data of the change in the voltage drop over time detected by the voltage sensor;
and calculating an internal short-circuit current Is that locally flows through the short-circuit segment based on the following formula (1) based on the electromotive force E of the short-circuit segment, the internal resistance value Ri, and the internal short-circuit resistance value Rs. A method for measuring an internal short-circuit state quantity, characterized by:

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