JP7430841B1 - Flow rate calculation device and flow rate calculation method - Google Patents

Abstract

An object of the present disclosure is to provide a flow rate calculation device that can accurately determine the flow rate of ejected material ejected from a battery. A flow rate calculation device according to an aspect of the present disclosure includes a cylindrical member having a first opening and a second opening at both longitudinal ends and forming a flow path for ejected ejected from a battery. , and a flow rate calculation means including a differential pressure measuring section disposed in the flow path. [Selection diagram] Figure 1

Description

The present disclosure relates to a flow rate calculation device and a flow rate calculation method.

BACKGROUND ART In recent years, the use of batteries has been increasing in many fields such as portable terminals, automobiles, and renewable energy. Batteries generate heat depending on the usage environment and usage conditions, and the heat generated by this heat generation may become uncontrollable and eject the contents (also known as thermal runaway). To ensure safety even when such thermal runaway occurs, simulations of battery thermal runaway are being conducted. One of the important parameters in this simulation is the flow rate of the ejected contents (ejected material). Non-patent document 1 is known as a method for determining the flow rate of this ejected material.

Gongquan Wang, Depeng Kong, Ping Ping, Jennifer Wen, Xiaoqin He, Hengle Zhao, Xu He, Rongqi Peng, Yue Zhang, Xiny i Dai, “Revealing particle venting of lithium-ion batteries during thermal runaway: A multi-scale model toward multiphase process” eTransportation 16 (2023) 100237, p. 1-20

In Non-Patent Document 1, a safety valve of a storage battery is provided with a rectifier, and a pitot tube disposed close to the rectifier measures the differential pressure of the ejected material to calculate the flow rate of the ejected material. Since the ejected material that has passed through the rectifier rapidly diffuses, the measurement method described in Non-Patent Document 1 cannot measure the differential pressure with high accuracy, and it may be difficult to obtain an accurate flow rate of the ejected material. There is.

In view of the above circumstances, an object of the present disclosure is to provide a flow rate calculation device that can accurately determine the flow rate of ejected matter ejected from a battery.

A flow rate calculation device according to an aspect of the present disclosure made to solve the above problems has a first opening and a second opening at both longitudinal ends, and forms a flow path for ejected matter ejected from a battery. and a flow rate calculating means including a differential pressure measuring section disposed in the flow path.

The flow rate calculation device according to one aspect of the present disclosure can accurately calculate the flow rate of the ejected material ejected from the battery.

FIG. 1 is a schematic front view showing a flow rate calculation device and a battery according to an embodiment of the present disclosure. FIG. 2 is a schematic front view showing a flow rate calculation device different from the flow rate calculation device of FIG. FIG. 3 is a schematic exploded plan view of the casing in the flow rate calculation device of FIG. 2. FIG. 4 is a schematic right side view of the casing of FIG. 3. FIG. FIG. 5 is a schematic bottom view of the lid of the casing in FIGS. 3 and 4. FIG. FIG. 6 is a schematic front view of the first side of the casing in FIGS. 3 and 4. FIG. FIG. 7 is a schematic rear view of the second side of the casing in FIGS. 3 and 4. FIG.

[Description of embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.

(1) A flow rate calculation device according to one aspect of the present disclosure includes a cylindrical member that has a first opening and a second opening at both longitudinal ends and forms a flow path for ejected matter ejected from a battery; and a flow rate calculation means including a differential pressure measuring section disposed in the flow path.

The flow rate calculation device includes a cylindrical member that forms a flow path for the ejected material ejected from the battery, and a differential pressure measuring section disposed in the flow path, so that the ejected material can be diffused. It is possible to measure the differential pressure. Therefore, the flow rate calculation device can accurately measure the differential pressure of the ejected material, and can further accurately calculate the flow rate of the ejected material.

(2) In (1) above, the flow path may constitute a single flow path for the ejected material, and the entire amount of the ejected material may be introduced into the flow path. By doing so, the differential pressure can be measured with higher accuracy.

(3) In (1) or (2) above, the battery may have a spouting part that spews out the ejected material, and the first opening may be directly connected to the spouting part. By doing so, the differential pressure can be measured with higher accuracy.

(4) In (1) or (2) above, the battery may further include a casing that accommodates the battery, and the casing may have a connecting portion connected to the first opening. By doing so, the accuracy and ease of measuring the differential pressure can be improved.

(5) In any one of (1) to (4) above, a collection member that collects the ejected material may be connected to the second opening. By doing so, the ejected material can be easily collected.

(6) In any one of (1) to (5) above, the differential pressure measuring section may include a pitot tube or an orifice. By doing so, it is possible to further improve the ease of measuring the differential pressure.

(7) In the above (6), the pitot tube may be a Western type. By using a Western-type pitot tube, the accuracy of the measurement of the differential pressure can be further improved.

(8) A flow rate calculation device according to another aspect of the present disclosure includes a cylindrical member that has a first opening and a second opening at both longitudinal ends and forms a flow path for ejected matter ejected from a battery. a flow rate calculating means including a differential pressure measuring section disposed in the flow path; a casing housing a battery and having a connection section connected to the first opening; and a casing connected to the second opening. and a collection member that collects the ejected material.

The flow rate calculation device includes a cylindrical member that forms a flow path for the ejected material ejected from the battery, and a differential pressure measuring section disposed in the flow path, so that the ejected material can be diffused. It is possible to measure the differential pressure. Therefore, the flow rate calculation device can accurately measure the differential pressure of the ejected material, and can further accurately calculate the flow rate of the ejected material. Furthermore, since the flow rate calculation device includes a casing that houses the battery, it is possible to improve the accuracy and ease of measuring the differential pressure. Furthermore, since the flow rate calculation device includes a collection member that collects the ejected material, it is possible to easily collect the ejected material.

(9) A flow rate calculation method according to an aspect of the present disclosure includes a step of disposing a differential pressure measuring section in a cylindrical member having a first opening and a second opening at both ends in the longitudinal direction, and measuring the differential pressure. a step of arranging the first opening of the cylindrical member, in which the cylindrical member is disposed, toward the battery; a step of causing the battery to generate heat or heating the battery to raise the temperature; The method includes a step of measuring a differential pressure of the ejected material using the differential pressure measuring section, and a step of calculating a flow rate of the ejected material from the measured differential pressure.

The flow rate calculation method uses a differential pressure measuring section to measure the differential pressure of the ejected material passing through the flow path formed by the cylindrical member, so it can be measured with high precision without diffusing the ejected material. be able to. Therefore, the flow rate of the ejected material can be determined with high accuracy.

(10) In (9) above, the method may further include a step of connecting a collection member that collects the ejected material to the second opening. By doing so, the ejected material can be easily collected.

Note that "flow rate" means volumetric flow rate [L/s].

[Details of the mode for carrying out the invention]
Embodiments of the present disclosure will be described in detail below with reference to the drawings.

<Flow rate calculation device>
FIG. 1 shows the flow rate calculation device 100.

[First embodiment]
The flow rate calculation device 100 includes a cylindrical member 110 having a first opening 111 and a second opening 112 at both ends in the longitudinal direction and forming a flow path 113 for ejected matter ejected from a battery B; and a flow rate calculation means including a differential pressure measuring section disposed in the flow rate calculation means. The flow rate calculation device 100 of this embodiment includes a thermometer T that measures the temperature of the ejected material, and a collection member 130 that collects the ejected material. In this embodiment, a pitot tube 120 is used as a differential pressure measuring section that measures the differential pressure of the ejected material passing through the flow path 113.

The battery B is not particularly limited as long as it ejects (releases) its contents due to thermal runaway, and examples thereof include storage batteries such as lithium ion batteries. Further, the battery B may have a housing having a substantially rectangular parallelepiped shape or a cylindrical shape, or may be formed into a bag shape by laminating sheet-like members. The above-mentioned contents (ejected matter) are mainly gas (steam) and include liquid and solid (particulate matter). Examples of the gas include carbon oxide, combustible gas, and the like. The battery B of this embodiment has a substantially rectangular parallelepiped-shaped casing, and a spouting part (safety valve) for spouting ejected material is formed between a pair of electrodes B1 and B2 provided on one surface (top surface). has been done.

The cylindrical member 110 forms a flow path 113 for the ejected material. That is, the ejected material ejected from the safety valve passes through the internal space of the cylindrical member 110. The cylindrical member 110, which is open at both ends in the longitudinal direction, has one opening, the first opening 111, facing the safety valve of the battery B, and the other opening, the second opening 112, having a collection member. 130 is connected.

Preferably, the channel 113 is configured as a single channel for the ejecta, into which the entire amount of the ejecta is introduced. That is, other channels for the ejected material to pass through, holes through which the ejected material leaks out of the cylindrical member 110, etc. are not provided, and the entire amount of the ejected material passes through the inside of the cylindrical member 110. It is preferable that it is formed. Moreover, it is preferable that the first opening 111 is directly connected to the safety valve. Specifically, the first opening 111 is arranged so as to be in close contact with the top surface of the battery B on which the safety valve is formed, and so that the safety valve is accommodated within the first opening 111 when viewed from above. is preferred. By doing so, it is possible to improve the certainty that the entire amount of the ejected material passes through the flow path 113, and it is possible to improve the measurement accuracy of the differential pressure (dynamic pressure) of the ejected material by the pitot tube 120. can.

The material of the cylindrical member 110 is not particularly limited as long as it can withstand the heat, pressure, etc. of the ejected material, and metals, resins, etc. can be used. Further, the inner diameter of the cylindrical member 110 is not particularly limited as long as the safety valve can be accommodated therein. The total length of the cylindrical member 110 is not particularly limited, and can be appropriately selected depending on the capacity of the battery B, the arrangement of the pitot tube 120, and the like. As the cylindrical member 110, a steel pipe standardized by JIS G3452:2019 or the like may be used. For example, if battery B is a storage battery of 50Ah or less, a steel pipe of 10A or more and 25A or less is used; If it is a storage battery of 25A or more, a steel pipe of 25A or more may be used.

The pitot tube 120 is arranged within the flow path 113 with the opening at its tip facing the safety valve. Although the pitot tube 120 is not particularly limited, it is preferably a Western type that can prevent the opening at the tip from being clogged by the ejected material.

The position (distance from safety) where the pitot tube 120 is arranged is not particularly limited, and can be selected as appropriate depending on the capacity of the battery B, the diameter of the flow path 113 (inner diameter of the cylindrical member 110), etc. For example, the distance from the safety valve to the opening at the tip may be 5 times or more and 10 times or less, or 7 times or more and 9 times or less, the diameter of the flow path 113. Good too.

ここで、Ｃ_１はピトー管係数であり、Ｐｄはピトー管１２０で測定した差圧であり、ρは上記噴出物の密度（流体密度）［ｋｇ／ｍ^３］である。 The flow velocity can be determined from the differential pressure caused by the passage of the ejected material in the flow path 113 measured by the pitot tube 120. This flow rate may be calculated by a flow rate calculation means described later. Specifically, the flow velocity _S1 is calculated using the following formula (1).

Here, C ₁ is the Pitot tube coefficient, Pd is the differential pressure measured in the Pitot tube 120, and ρ is the density (fluid density) of the ejected material [kg/m ³ ].

The fluid density ρ may be a numerical value obtained in past tests, but since the flow rate calculation device 100 of this embodiment includes a collection member 130 that collects the ejected material, the collected ejected material It is preferable to use the fluid density ρ determined from the average molecular weight M obtained by analyzing the substance.

A flow rate calculating means (not shown) calculates the flow rate of the ejected material using the flow rate _S1 determined by the above equation (1). Specifically, the flow rate calculation means calculates the flow rate Q [L/s] of the ejected material using the following equation (2). The flow rate calculation means is not particularly limited, and may be, for example, a personal computer.
Q = A × S ₁ ...(2)
Here, A is the cross-sectional area [m ² ] of the flow path 113.

ここで、Ｃ_１は上記オリフィスの流量係数であり、Ａ_０は上記オリフィスの孔の断面積［ｍ^２］であり、ΔＰは上記オリフィスの上流側と下流側との差圧［Ｐａ］である。 An orifice may be provided in the flow path 113 instead of the pitot tube 120. Specifically, a flow meter is prepared, an orifice is arranged in the cylindrical member 110, and communication passages communicating with the flow meter are provided upstream and downstream of the orifice. The flow rate calculation means calculates the flow rate Q [L/s] of the ejected material by using the differential pressure between the upstream side and the downstream side of the orifice measured by the two flow meters in the following equation (3). I can do it.

Here, C ₁ is the flow coefficient of the orifice, A ₀ is the cross-sectional area [m ² ] of the orifice, and ΔP is the differential pressure [Pa] between the upstream and downstream sides of the orifice. .

The thermometer T measures the temperature of the ejected material passing through the flow path 113. The thermometer T may be disposed downstream of the pitot tube 120 or the orifice, but is preferably disposed upstream, and may be disposed upstream and downstream. The thermometer T is preferably disposed close to the pitot tube 120 or the orifice. The thermometer T is not particularly limited, and for example, a thermocouple can be used. The measured temperature, together with the flow rate, can be used in various simulations due to battery thermal runaway.

The collection member 130 connected to the second opening 112 collects the ejected material that has passed through the flow path 113. The collection member 130 is not particularly limited and may be a box-like member, a bag-like member, etc., but an internal space may be formed in advance in order to reduce the pressure loss of the ejected material. A bag-like member that is not covered is preferable. An example of such a bag-like member is a gas sampling bag (gas bag).

By analyzing the collected ejected material, the flow velocity and flow rate of the ejected material can be calculated with higher accuracy. Specifically, the collected ejecta is analyzed to determine the average molecular weight, the actual density ρ [kg/m ³ ] of the ejecta is calculated using the following formula (4), and this fluid density is By using ρ in the above equation (1) or the above equation (3), the above flow velocity and the above flow rate can be calculated with higher accuracy.
ρ = (P × M) / (R × _TM ) (4)
In the above formula (4), P is the atmospheric pressure [Pa], M is the average molecular weight of the ejected material, R is the gas constant [J/K kmol], and T _M is measured with a thermometer T. This is the temperature [°C] of the ejected material.

Since the flow rate calculation device 100 includes the pitot tube 120 or orifice and the collection member 130, it is possible to simultaneously measure the differential pressure of the ejected material and collect the ejected material using the pitot tube 120 or the orifice. . That is, since the actual density (fluid density) of the ejected material can be obtained, the flow velocity and flow rate of the ejected material can be calculated with high accuracy.

[Second embodiment]
FIG. 2 shows a flow rate calculation device 200 according to another embodiment different from the flow rate calculation device 100 described above. Components that are the same as those of the flow rate calculation device 100 described above are designated by the same reference numerals, and a description thereof will be omitted.

The flow rate calculation device 200 includes a cylindrical member 110, a pitot tube 120, and a casing 210 that accommodates a battery B. The flow rate calculation device 200 may include an orifice instead of the pitot tube 120. Further, the flow rate calculation device 200 may include a thermometer disposed on the cylindrical member 110 and a collection member connected to the second opening 112 of the cylindrical member 110.

It is preferable that the casing 210 has a connecting part 211 connected to the first opening 111. By doing so, the cylindrical member 110 can be easily arranged, and furthermore, the ejected material ejected by the safety valve of the battery B can be easily guided to the cylindrical member 110.

The material of the casing 210 is not particularly limited as long as it can withstand thermal runaway of the battery B, and for example, metal or resin can be used. Examples of the resin include Bakelite.

It is preferable that the casing 210 is formed to accommodate the battery B without any gaps. That is, it is preferable that the inner surface of the casing 210 and the outer surface of the battery B are formed in close contact with each other. By doing so, it is possible to suppress the ejected material from entering into the casing 210, and it is possible to suppress a decrease in the accuracy of measurement by the pitot tube 120 or the orifice.

In a battery where the location from which ejected material is ejected can be specified or predicted, such as battery B having a safety valve, the cylindrical member 110 may be placed directly on the battery or may be placed on the casing 210. In a battery where the location from which the ejected material is ejected cannot be predicted, it is preferable that the battery be housed in a casing and a cylindrical member disposed in the casing.

In the case of a battery in which the location from which ejected material is ejected cannot be predicted, it is preferable that a gap be formed between the casing and the battery. That is, it is preferable that the volume of the space in the casing for accommodating the battery is large relative to the external shape of the battery (volume of the battery). By doing so, the ejected material ejected from the bag-shaped battery can be easily guided to the connection part of the casing.

As shown in FIGS. 3 and 4, for example, the casing 210 includes a lid part 212 that covers the top surface of the rectangular parallelepiped battery B, and a first side that covers the back surface (one wide surface), both side surfaces, and the bottom surface of the battery B. 213, and a second side portion 214 that covers the front side (the other wide side) of battery B.

A connecting portion 211 is formed in the lid portion 212 . Specifically, a hole portion 212a whose inner diameter is approximately the same as the outer diameter of the cylindrical member 110 is formed, and the cylindrical member 110 fits into this hole portion 212a. A safety valve hole 212b penetrating toward the lower surface (battery B side surface) of the lid portion 212 is formed in the bottom surface of the hole portion 212a. This safety valve hole 212b guides the ejected material ejected from the safety valve to the flow path 113. The center of the safety valve hole 212b in plan view preferably coincides with the center of the safety valve and the center of the flow path 113.

As shown in FIG. 5, a pair of lid recesses 212c and 212d are formed on the lower surface of the lid portion 212 to avoid contact with the electrodes B1 and B2 of the battery B. Lid insertion holes 212e and 212f are formed in the lid recessed portions 212c and 212d, through which wiring (not shown) for supplying power to battery B and wiring (not shown) for measuring the voltage of battery B are inserted. ing. The lower surface of the lid portion 212 contacts the top surface of the battery B, the upper surface (upper end) of the first side portion 213, and the upper surface of the second side portion 214 at a portion other than the safety valve hole 212b and the lid recessed portions 212c and 212d. It is preferable that it be formed as follows.

A groove portion is formed in the lid portion 212 for disposing a sealing material (not shown) that suppresses the ejected material from leaking into the casing 210. Specifically, a first groove portion 212g is formed to surround the safety valve hole 212b, and a second groove portion 212h is formed to surround the pair of lid recessed portions 212c and 212d. There is.

As shown in FIG. 6, the first side part 213 includes a bottom part 213a on which the battery B is placed, a back part 213b that stands up on the bottom part 213a and covers the back side of the battery B, and a pair of parts that cover both sides. side portions 213c and 213d. A recessed portion 213e for arranging an electric heater (not shown) for heating the battery B is formed on the inner surface of the back portion 213b. A pair of heater insertion holes 213f and 213g are formed near the recessed portion 213e, through which wiring (not shown) for feeding power to the electric heater is inserted.

The second side portion 214 is a substantially plate-shaped member, and as shown in FIG. 7, a groove portion 214a for disposing a sealant (not shown) is formed on the joint surface with the first side portion 213. .

The lid portion 212, the first side portion 213, and the second side portion 214 are each formed to be fixed to each other by known means such as bolts (not shown).

<Flow rate calculation method>
The flow rate calculation method includes a step of disposing a differential pressure measuring section in a cylindrical member 110 having a first opening 111 and a second opening 112 at both ends in the longitudinal direction, and a step of disposing the differential pressure measuring section. A step of arranging the first opening 111 of the cylindrical member 110 toward the battery B, a step of causing the battery B to generate heat or heating the battery B to increase the temperature, and a step of ejecting from the battery B whose temperature has increased. The method includes a step of measuring a differential pressure of the ejected material using the differential pressure measuring section, and a step of calculating a flow rate of the ejected material from the measured differential pressure. Preferably, the flow rate calculation method includes a step of connecting a collection member 130 that collects the ejected material to the second opening 112 before the step of increasing the temperature. Further, the flow rate calculation method may include a step of accommodating the battery B in the casing 210.

[Accommodating process]
In the housing step, battery B is housed in casing 210. Specifically, first, a sealant is placed in the first groove portion 212g, the second groove portion 212h of the lid portion 212, and the groove portion 214a of the second side portion 214. An electric heater is disposed in the recess 213e of the first side portion 213, and a power supply wiring is inserted into the heater insertion hole 213f. Next, the battery B is placed inside the first side 213 and the second side 214 is fixed to the first side 213 . Next, the wiring for supplying power to the battery B and the wiring for voltage measurement are inserted into the lid insertion holes 212e and 212f of the lid part 212 to connect them to the electrodes B1 and B2, and the lid part 212 is inserted into the first side part 213 and the wiring for voltage measurement. The second side portion 214 is fixed to the second side portion 214 . It is preferable that each of the insertion holes through which each wiring is inserted is filled with a filler such as an epoxy resin and sealed.

[Process of installing]
In the step of arranging, a differential pressure measuring section (pitot tube 120) is arranged in a cylindrical member 110 having a first opening 111 and a second opening 112 at both ends in the longitudinal direction. It is preferable that the pitot tube 120 provided is a Western type. The pitot tube 120 is arranged with the opening at the tip facing the first opening 111. It is preferable that the cylindrical member 110 is also provided with a thermometer T.

[Process of placing]
In the arranging step, the first opening 111 of the cylindrical member 110 in which the pitot tube 120 (or orifice) is disposed is arranged toward the battery B. That is, the cylindrical member 110 is arranged so as to form a flow path for the ejected material ejected from the safety valve. It is preferable that the cylindrical member 110 is disposed by fitting the first opening 111 into the connecting portion 211 (hole portion 212a) of the casing 210. When the battery B is not housed in the casing 210, it is preferable to arrange the cylindrical member 110 so that the first opening 111 is directly connected to the safety valve.

[Connection process]
In the connecting step, the collecting member 130 that collects the ejected material is connected to the second opening 112. Specifically, the opening of the collection member 130 is connected to the second opening 112. When a gap is formed between the opening of the collection member 130 and the second opening 112, it is preferable to seal this gap with tape or the like.

[Heating process]
In the heating step, battery B is made to generate heat or battery B is heated to increase its temperature. The method for increasing the temperature of battery B is not particularly limited, but for example, battery B may be heated by supplying power to an electric heater placed so that its heating surface is in contact with battery B. Alternatively, excessive electricity may be supplied (by overcharging) to generate heat, or a sharp conductive material such as a nail may be inserted into battery B to cause an internal short circuit.

[Calculation process]
In the calculating step, the flow rate of the ejected material ejected from the safety valve of the heated battery B is calculated from the differential pressure measured in the pitot tube 120 (or orifice). Specifically, the flow rate of the ejected material is calculated from the differential pressure using the above equation (1) and the above equation (2) (or the above equation (3)). In the calculating step, it is preferable that the ejected material is simultaneously collected by the collection member 130, and the fluid density ρ used in the above equation (1) (or the above equation (3)) is determined by the collection member 130 collecting the ejected material. It is preferable to use the value of the average molecular weight calculated by the above formula (4) by analyzing the collected ejected material.

<Advantages>
The flow rate calculation devices 100, 200 and the flow rate calculation method include a cylindrical member 111 forming a flow path 113 for ejected matter ejected from a battery B, and a differential pressure measuring unit (pitot tube) disposed in the flow path 113. 120 or orifice), the differential pressure can be measured without diffusing the ejected material. Therefore, the flow rate of the ejected material can be calculated with high accuracy. The calculated flow rate is suitably used for various simulations due to thermal runaway of batteries, for example, simulations for the safety of a battery pack in which a plurality of batteries are connected.

Further, by connecting the collection member 130 to the second opening 112 of the cylindrical member 110, the measurement of the ejected material by the differential pressure measuring section and the collection of the ejected material can be performed simultaneously, and the ejected material can be collected at the same time. The flow rate can be calculated with higher accuracy.

[Other embodiments]
The above embodiments do not limit the configuration of the present disclosure. Therefore, in the above embodiment, it is possible to omit, replace, or add components of each part of the above embodiment based on the description of this specification and common general technical knowledge, and all of these are interpreted as falling within the scope of the present disclosure. Should.

The pitot tube disposed in the cylindrical member may be L-shaped.

Although a substantially straight cylindrical member is shown in FIGS. 1 and 2, the cylindrical member may be curved or may be a combination of a straight portion and a curved portion.

In FIGS. 3, 4, and 5, the connecting portion of the casing is shown in a substantially circular shape in plan view. That is, the drawings assume that the cross section of the cylindrical member is approximately circular. The cross section of the cylindrical member is not limited to being circular, but may be elliptical, rectangular, polygonal, etc., as long as it can form a flow path.

The flow rate calculation device and flow rate calculation method of the present disclosure can accurately determine the flow rate of ejected matter ejected from a battery, and the calculated flow rate can be used in various simulations due to battery thermal runaway, for example, for a battery with multiple batteries connected. It is suitably used for simulating pack safety.

100, 200 Flow rate calculation device 110 Cylindrical member 111 First opening 112 Second opening 113 Channel 120 Pitot tube 130 Collection member 210 Casing 211 Connection portion 212 Lid portion 212a Hole portion 212b Safety valve hole 212c, 212d Lid recess Parts 212e, 212f Lid insertion hole 212g First groove part 212h Second groove part 213 First side part 213a Bottom part 213b Back part 213c, 213d Side part 213e Recessed part 213f, 213g Heater insertion hole 214 Second side part 214a Groove Part B Battery B1, B2 Electrode T Thermometer

Claims (10)

a cylindrical member having a first opening and a second opening at both ends in the longitudinal direction, and arranged to form a flow path in the direction of ejection of ejected material ejected from the battery;
A flow rate calculation device comprising: a flow rate calculation means including a differential pressure measuring section disposed in the flow path. 2. The flow rate calculation device according to claim 1 , wherein the battery has a spouting part that spews out the ejected material, and the first opening is directly connected to the spouting part. a cylindrical member having a first opening and a second opening at both ends in the longitudinal direction and forming a flow path for ejected matter ejected from the battery;
a flow rate calculation means including a differential pressure measuring section disposed in the flow path;
A casing that houses the battery and
Equipped with
A flow rate calculation device in which the casing accommodates a battery without any gaps. a cylindrical member having a first opening and a second opening at both ends in the longitudinal direction and forming a flow path for ejected matter ejected from the battery;
a flow rate calculation means including a differential pressure measurement unit disposed in the flow path;
A casing that houses the battery and
Equipped with
A flow rate calculation device in which the inner surface of the casing and the outer surface of the battery are in close contact with each other. The flow rate calculation device according to claim 3 or 4 , wherein the casing has a connecting portion connected to the first opening. The flow rate calculation device according to any one of claims 1 to 4 , wherein the flow path constitutes a single flow path for the ejected material, and the entire amount of the ejected material is introduced into the flow path. The flow rate calculation device according to any one of claims 1 to 4, wherein a collection member that collects the ejected material is connected to the second opening. arranging a differential pressure measuring section in a cylindrical member having a first opening and a second opening at both ends in the longitudinal direction;
arranging the first opening of the cylindrical member, in which the differential pressure measuring section is disposed, toward the battery so that the cylindrical member forms a flow path in the direction of ejection of ejecta from the battery; ,
a step of causing the battery to generate heat or heating the battery to increase the temperature;
a step of measuring a differential pressure of ejected material ejected from the battery whose temperature has increased using the differential pressure measuring section;
A flow rate calculation method comprising: calculating the flow rate of the ejected material from the measured differential pressure. arranging a differential pressure measuring section in a cylindrical member having a first opening and a second opening at both ends in the longitudinal direction;
accommodating the battery in a casing so that no gap is formed between the battery and the battery;
arranging a first opening of the cylindrical member, in which the differential pressure measuring section is disposed, in the casing, facing the battery;
a step of causing the battery to generate heat or heating the battery to increase the temperature;
a step of measuring a differential pressure of ejected material ejected from the battery whose temperature has increased using the differential pressure measuring section;
a step of calculating the flow rate of the ejected material from the measured differential pressure;
A flow rate calculation method comprising: The flow rate calculation method according to claim 8 or 9, further comprising the step of connecting a collection member that collects the ejected material to the second opening.

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