Flow rate calculation device and method for calculating flow rate

Abstract

To provide a flow rate calculation device which can precisely determine the flow rate of an ejection object ejecting from a battery.SOLUTION: The rate calculation device according to an embodiment of the present disclosure includes: a cylindrical member having a first opening unit and a second opening unit in both ends of a longer direction, the cylindrical member forming a flow passage of an ejection object ejected from a battery; and flow rate calculation means including a differential pressure measuring unit arranged in the flow passage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a flow rate calculation device and a flow rate calculation method. [Background technology]

[0002] 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 environment and conditions of use, and this heat can become uncontrollable, causing the contents to erupt (also known as thermal runaway). Simulations of battery thermal runaway are being conducted to ensure safety even when such thermal runaway occurs. One of the important parameters in this simulation is the flow rate of the erupted contents (ejected material). Non-Patent Document 1 is known as a method for calculating the flow rate of the ejected material. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Gongquan Wang, Depeng Kong, Ping Ping, Jennifer Wen, Xiaoqin He, Hengle Zhao, Xu He, Rongqi Peng, Yue Zhang, Xinyi 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 Summary of the Invention [Problem to be solved by the invention]

[0004] In Non-Patent Document 1, a rectifier is provided in the safety valve of the storage battery, and a pitot tube is disposed adjacent to the rectifier to measure the differential pressure of the ejected material and calculate the flow rate of the ejected material. Since the ejected material that passes through the rectifier rapidly diffuses, the measurement method of Non-Patent Document 1 cannot measure the differential pressure with high accuracy, and there is a risk that it will be difficult to obtain an accurate flow rate of the ejected material.

[0005] In consideration of the above-mentioned circumstances, an object of the present disclosure is to provide a flow rate calculation device that can accurately calculate the flow rate of material ejected from a battery. [Means for solving the problem]

[0006] A flow rate calculation device according to one embodiment of the present disclosure, which has been made to solve the above problems, comprises a tubular member having a first opening and a second opening at both ends in the longitudinal direction and forming a flow path for material ejected from the battery, and a flow rate calculation means including a differential pressure measurement unit arranged in the flow path. Effect of the Invention

[0007] A flow rate calculation device according to an aspect of the present disclosure can accurately calculate the flow rate of material ejected from a battery. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic front view showing a flow rate calculation device and a battery according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a schematic front view showing a flow rate calculation device different from the flow rate calculation device in FIG. [Diagram 3] FIG. 3 is a schematic exploded plan view of a casing in the flow rate calculation device of FIG. [Figure 4] FIG. 4 is a schematic right side view of the casing of FIG. [Diagram 5] FIG. 5 is a schematic bottom view of the lid of the casing in FIGS. 3 and 4. FIG. [Figure 6] FIG. 6 is a schematic front view of the first side of the casing in FIGS. 3 and 4. FIG. [Figure 7] FIG. 7 is a schematic rear view of the second side of the casing in FIGS. 3 and 4. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described.

[0010] (1) A flow rate calculation device according to one embodiment of the present disclosure includes a tubular member having a first opening and a second opening at both ends in a longitudinal direction and forming a flow path for material ejected from a battery, and a flow rate calculation means including a differential pressure measurement unit disposed in the flow path.

[0011] 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 measurement unit that is disposed in the flow path, and therefore can measure the differential pressure of the ejected material without diffusing it. Therefore, the flow rate calculation device can accurately measure the differential pressure of the ejected material, and can therefore accurately calculate the flow rate of the ejected material.

[0012] (2) In the above (1), 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. In this way, the differential pressure can be measured with higher accuracy.

[0013] (3) In the above (1) or (2), the battery may have a jetting part that jets out a jet of material, and the first opening may be directly connected to the jetting part. In this way, the differential pressure can be measured with even greater accuracy.

[0014] (4) In the above (1) or (2), a casing for accommodating a battery may be further provided, and the casing may have a connection part for connection to the first opening. In this way, it is possible to improve the accuracy and ease of measuring the differential pressure.

[0015] (5) In any one of (1) to (4) above, a collection member that collects the ejected material may be connected to the second opening. In this way, the ejected material can be easily collected.

[0016] (6) In any one of (1) to (5) above, the differential pressure measuring unit may include a Pitot tube or an orifice. In this way, it is possible to further improve the ease of measuring the differential pressure.

[0017] (7) In the above (6), the Pitot tube may be of a Western type. By using a Western-type Pitot tube, the accuracy of the measurement of the differential pressure can be further improved.

[0018] (8) A flow rate calculation device according to another embodiment of the present disclosure includes a tubular member having a first opening and a second opening at both ends in a longitudinal direction and forming a flow path for material ejected from a battery, a flow rate calculation means including a differential pressure measurement unit disposed in the flow path, a casing that houses a battery and has a connection part connected to the first opening, and a collection member connected to the second opening and that collects the material ejected.

[0019] 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 measurement unit that is disposed in the flow path, and therefore can measure the differential pressure without diffusing the ejected material. Therefore, the flow rate calculation device can accurately measure the differential pressure of the ejected material, and can therefore accurately calculate the flow rate of the ejected material. In addition, the flow rate calculation device includes a casing that houses the battery, and therefore can improve the accuracy and ease of measuring the differential pressure. Furthermore, the flow rate calculation device includes a collection member that collects the ejected material, and therefore can easily collect the ejected material.

[0020] (9) A flow rate calculation method according to one embodiment of the present disclosure includes the steps of: arranging a differential pressure measurement unit in a tubular member having a first opening and a second opening at both longitudinal ends; positioning the first opening of the tubular member in which the differential pressure measurement unit is arranged toward a battery; causing the battery to generate heat or heating the battery to increase its temperature; measuring the differential pressure of material ejected from the battery whose temperature has increased with the differential pressure measurement unit; and calculating the flow rate of the material ejected from the battery from the measured differential pressure.

[0021] In this flow rate calculation method, the differential pressure of the ejected material passing through the flow path formed by the cylindrical member is measured by the differential pressure measurement unit, so that the flow rate can be measured with high accuracy without diffusing the ejected material, and therefore the flow rate of the ejected material can be obtained with high accuracy.

[0022] (10) In the above (9), a step of connecting a collection member for collecting the ejected material to the second opening may be further included. In this way, the ejected material can be easily collected.

[0023] Note that "flow rate" refers to volumetric flow rate [L / s].

[0024] [Details of the embodiment of the invention] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0025] <Flow rate calculation device> FIG. 1 shows the flow rate calculation device 100.

[0026] 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 the ejected material ejected from the battery B, and a flow rate calculation means including a differential pressure measurement unit disposed in the flow path 113. 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 measurement unit that measures the differential pressure of the ejected material passing through the flow path 113.

[0027] The battery B is not particularly limited as long as it ejects (releases) the contents by thermal runaway, and examples thereof include storage batteries such as lithium ion batteries. The battery B may have a substantially rectangular or cylindrical housing, or may be formed into a bag shape by laminating sheet-like members. The contents (ejected material) are mainly gas (vapor) and include liquid and solid (particulate matter). Examples of the gas include carbon oxide and flammable gas. The battery B of this embodiment has a substantially rectangular housing, and an ejection part (safety valve) for ejecting the ejected material is formed between a pair of electrodes B1 and B2 provided on one surface (top surface).

[0028] 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 is open at both ends in the longitudinal direction, and one opening, a first opening 111, is disposed toward the safety valve of the battery B, and a collection member 130 is connected to the other opening, a second opening 112.

[0029] It is preferable that the flow path 113 is configured as a single flow path for the ejected material, and that the entire amount of the ejected material is introduced therein. That is, it is preferable that the flow path 113 is formed so that the entire amount of the ejected material passes through the cylindrical member 110 without providing other flow paths for the ejected material to pass through, or holes through which the ejected material leaks out of the cylindrical member 110. It is also preferable that the first opening 111 is directly connected to the safety valve. Specifically, it is preferable that the first opening 111 is in close contact with the top surface of the battery B on which the safety valve is formed, and is disposed so that the safety valve fits within the first opening 111 in a plan view. In this way, it is possible to improve the reliability of the entire amount of the ejected material passing 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.

[0030] 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 metal, resin, etc. can be used. The inner diameter of the cylindrical member 110 is not particularly limited as long as it can accommodate the safety valve. 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, etc. As the cylindrical member 110, a steel pipe standardized by JIS G3452:2019 or the like may be used. For example, if the battery B is a storage battery of 50 Ah or less, a steel pipe of 10 A or more and 25 A or less may be used, and if the battery B is a storage battery of more than 50 Ah, a steel pipe of more than 25 A may be used.

[0031] The pitot tube 120 is disposed in the flow path 113 with the opening at the tip facing the safety valve. The pitot tube 120 is not particularly limited, but is preferably a western type that can suppress clogging of the opening at the tip due to the ejection.

[0032] The position (distance from safety) at which the Pitot tube 120 is disposed is not particularly limited and may be appropriately selected depending on the capacity of the battery B, the diameter of the flow path 113 (the inner diameter of the tubular member 110), etc. For example, the distance from the safety valve to the opening at the tip may be 5 to 10 times the diameter of the flow path 113, or 7 to 9 times.

[0033] The flow velocity can be calculated from the pressure difference caused by the passage of the ejected material in the flow passage 113, measured by the Pitot tube 120. This flow velocity may be calculated by a flow rate calculation means, which will be described later. Specifically, the flow velocity S1 is calculated using the following formula (1).

number

[0034] The fluid density ρ may be a value obtained from a past test, but since the flow rate calculation device 100 of this embodiment is equipped with a collection member 130 that collects the ejected material, it is preferable to use the fluid density ρ calculated from the average molecular weight M obtained by analyzing the collected ejected material.

[0035] A flow rate calculation means (not shown) calculates the flow rate of the ejected material using the flow velocity S1 obtained by the above formula (1). Specifically, the flow rate calculation means calculates the flow rate Q [L / s] of the ejected material using the following formula (2). The flow rate calculation means is not particularly limited, and may be, for example, a personal computer. Q = A × S1 (2) Here, A is the cross-sectional area of ​​the flow path 113 [m 2 ].

[0036] 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 provided in the cylindrical member 110, and communication paths leading to the flow meter are provided upstream and downstream of the orifice. The flow rate calculation means can calculate 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 formula (3).

number

[0037] Thermometer T measures the temperature of the ejected material passing through flow path 113. Thermometer T may be disposed downstream of Pitot tube 120 or the orifice, but is preferably disposed upstream, and may be disposed upstream and downstream. Thermometer T is preferably disposed in the vicinity of Pitot tube 120 or the orifice. Thermometer T is not particularly limited, and may be, for example, a thermocouple. The measured temperature, together with the flow rate, can be used for various simulations due to thermal runaway of the battery.

[0038] 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-shaped member, a bag-shaped member, or the like, but in order to reduce pressure loss of the ejected material, a bag-shaped member without an internal space formed in advance is preferable. An example of such a bag-shaped member is a gas collection bag (gas bag).

[0039] By analyzing the collected ejecta, the flow velocity and flow rate of the ejecta can be calculated more accurately. Specifically, the collected ejecta is analyzed to determine the average molecular weight, and the actual density ρ [kg / m 3 ] and using this fluid density ρ in the above formula (1) or (3), the flow velocity and the flow rate can be calculated with higher accuracy. ρ = (P × M) / (R × T M ) ····(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 the temperature of the ejecta measured by thermometer T [℃].

[0040] The flow rate calculation device 100 includes the Pitot tube 120 or the orifice and the collection member 130, and therefore can simultaneously measure the pressure difference of the ejected material by the Pitot tube 120 or the orifice and collect the ejected material. In other words, the actual density (fluid density) of the ejected material can be obtained, and therefore the flow velocity and flow rate of the ejected material can be calculated with high accuracy.

[0041] Second Embodiment 2 shows a flow rate calculation device 200 according to another embodiment different from the above-described flow rate calculation device 100. The same components as those in the above-described flow rate calculation device 100 are denoted by the same reference numerals and description thereof will be omitted.

[0042] The flow rate calculation device 200 includes a cylindrical member 110, a Pitot tube 120, and a casing 210 that houses a battery B. The flow rate calculation device 200 may include an orifice instead of the Pitot tube 120. The flow rate calculation device 200 may also include a thermometer disposed in the cylindrical member 110, and a collection member connected to the second opening 112 of the cylindrical member 110.

[0043] The casing 210 preferably has a connection portion 211 that is connected to the first opening 111. In this manner, the cylindrical member 110 can be easily disposed, and further, the ejection material ejected by the safety valve of the battery B can be easily guided to the cylindrical member 110.

[0044] The material of the casing 210 is not particularly limited as long as it can withstand the thermal runaway of the battery B, and may be, for example, a metal or a resin. An example of the resin is Bakelite.

[0045] The casing 210 is preferably formed to house the battery B without any gaps. In other words, the casing 210 is preferably formed so that the inner surface of the casing 210 and the outer surface of the battery B are in close contact with each other. In this way, the ejected material can be prevented from entering the casing 210, and the accuracy of the measurement by the pitot tube 120 or the orifice can be prevented from decreasing.

[0046] In a battery from which the location from which the ejection material will be ejected can be specified or predicted, such as battery B having a safety valve, the cylindrical member 110 may be disposed directly in the battery, or may be disposed in the casing 210. In a battery from which the location from which the ejection material will be ejected cannot be predicted, it is preferable to house the battery in a casing and to dispose the cylindrical member in the casing.

[0047] For batteries in which the location from which the ejection material will come out is unpredictable, it is preferable to form a gap between the casing and the battery. In other words, it is preferable that the volume of the space in the casing that houses the battery is larger than the external shape of the battery (volume of the battery). In this way, the ejection material coming out of the bag-shaped battery can be easily guided to the connection part of the casing.

[0048] As shown in Figures 3 and 4, for example, the casing 210 has a lid portion 212 covering the top surface of the rectangular parallelepiped battery B, a first side portion 213 covering the back surface (one of the wide surfaces), both side surfaces and bottom surface of the battery B, and a second side portion 214 covering the front surface (the other wide surface) of the battery B.

[0049] A connection part 211 is formed in the lid part 212. Specifically, a hole part 212a having an inner diameter substantially equal to the outer diameter of the cylindrical member 110 is formed, and the cylindrical member 110 fits into this hole part 212a. A safety valve hole 212b penetrating toward the lower surface (surface on the battery B side) of the lid part 212 is formed in the bottom surface of the hole part 212a. This safety valve hole 212b guides the ejection material ejected from the safety valve to the flow path 113. It is preferable that the center of the safety valve hole 212b in a plan view coincides with the center of the safety valve and the center of the flow path 113.

[0050] 5, a pair of lid recesses 212c, 212d are formed on the underside of the lid portion 212 to avoid contact with the electrodes B1, B2 of the battery B. The lid recesses 212c, 212d are formed with lid insertion holes 212e, 212f for inserting wiring (not shown) for supplying power to the battery B and wiring (not shown) for measuring the voltage of the battery B. The underside of the lid portion 212 is preferably formed so as to contact 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 portions other than the safety valve hole 212b and the lid recesses 212c, 212d.

[0051] The lid portion 212 is formed with a groove portion for arranging a sealing material (not shown) that suppresses leakage of the ejected material into the casing 210. Specifically, a first groove portion 212g formed so as to surround the safety valve hole 212b, and a second groove portion 212h formed so as to surround the pair of lid recessed portions 212c, 212d are formed.

[0052] 6, the first side portion 213 includes a bottom portion 213a on which the battery B is placed, a back portion 213b that stands on the bottom portion 213a and covers the back surface of the battery B, and a pair of side portions 213c, 213d that cover both side surfaces. A recessed portion 213e is formed on the inner surface of the back portion 213b for disposing an electric heater (not shown) that heats the battery B. A pair of heater insertion holes 213f, 213g are formed near the recessed portion 213e for inserting wiring (not shown) that supplies power to the electric heater.

[0053] The second side portion 214 is a generally plate-shaped member, and as shown in FIG. 7, a groove portion 214a is formed on the joint surface with the first side portion 213 for arranging a sealant (not shown).

[0054] The lid portion 212, the first side portion 213 and the second side portion 214 are formed so as to be fixed to each other by known means such as bolts (not shown).

[0055] <Flow rate calculation method> The flow rate calculation method includes a step of arranging a differential pressure measurement unit in a cylindrical member 110 having a first opening 111 and a second opening 112 at both ends in the longitudinal direction, a step of arranging the first opening 111 of the cylindrical member 110 in which the differential pressure measurement unit is arranged facing a battery B, a step of generating heat in the battery B or heating the battery B to increase the temperature, a step of measuring the differential pressure of the ejection material ejected from the battery B whose temperature has increased with the differential pressure measurement unit, and a step of calculating the flow rate of the ejection material from the measured differential pressure. The flow rate calculation method preferably includes a step of connecting a collection member 130 that collects the ejection material to the second opening 112 before the step of increasing the temperature. The flow rate calculation method may also include a step of housing the battery B in a casing 210.

[0056] [Containing step] In the housing step, the battery B is housed in the casing 210. Specifically, first, a sealant is placed in the first groove portion 212g, the second groove portion 212h, and the groove portion 214a of the second side portion 214 of the lid portion 212. An electric heater is placed in the recess 213e of the first side portion 213, and a power supply wire is inserted into the heater insertion hole 213f. Next, the battery B is placed in the first side portion 213, and the second side portion 214 is fixed to the first side portion 213. Next, a wire for supplying power to the battery B and a wire for voltage measurement are inserted into the lid insertion holes 212e and 212f of the lid portion 212 to connect them to the electrodes B1 and B2, and the lid portion 212 is fixed to the first side portion 213 and the second side portion 214. The above-mentioned insertion holes through which the wires have been inserted are preferably filled with a filler such as epoxy resin and sealed.

[0057] [Installation process] In the disposing step, a differential pressure measuring unit (pitot tube 120) is disposed in a cylindrical member 110 having a first opening 111 and a second opening 112 at both ends in the longitudinal direction. The disposed pitot tube 120 is preferably a western type. The pitot tube 120 is disposed with the opening at the tip facing the first opening 111. A thermometer T is also preferably disposed in the cylindrical member 110.

[0058] [Placement process] In the placing step, the first opening 111 of the cylindrical member 110 in which the pitot tube 120 (or orifice) is disposed is placed facing the battery B. That is, the cylindrical member 110 is placed so as to become a flow path for the ejection material ejected from the safety valve. It is preferable that the cylindrical member 110 is placed by fitting the first opening 111 into the connection portion 211 (hole portion 212a) of the casing 210. When the battery B is not housed in the casing 210, it is preferable that the cylindrical member 110 is placed so that the first opening 111 is directly connected to the safety valve.

[0059] [Connection process] In the connecting step, the capture member 130 that captures the ejected material is connected to the second opening 112. Specifically, the opening of the capture member 130 is connected to the second opening 112. If a gap is formed between the opening of the capture member 130 and the second opening 112, it is preferable to seal this gap with tape or the like.

[0060] [Heating step] In the heating step, the battery B is made to generate heat or the temperature is increased by heating the battery B. The method for increasing the temperature of the battery B is not particularly limited, but for example, the battery B may be heated by supplying power to an electric heater arranged so that the heating surface of the battery B is in contact with the battery B, or the battery B may be heated by supplying excess electricity (putting the battery in an overcharged state), or a sharp conductive material such as a nail may be pierced into the battery B to short-circuit it internally.

[0061] [Calculation step] In the calculation step, the flow rate of the ejection material ejected from the safety valve of the heated battery B is calculated from the differential pressure measured by the Pitot tube 120 (or the orifice). Specifically, the flow rate of the ejection material is calculated from the differential pressure using the above formula (1) and the above formula (2) (or the above formula (3)). In the calculation step, it is preferable to simultaneously collect the ejection material with the collection member 130, and the fluid density ρ used in the above formula (1) (or the above formula (3)) is preferably the average molecular weight value calculated by the above formula (4) by analyzing the ejection material collected by the collection member 130.

[0062] <Advantages> The flow rate calculation device 100, 200 and the flow rate calculation method include a cylindrical member 111 that forms a flow path 113 for the ejection material ejected from the battery B, and a differential pressure measurement unit (a pitot tube 120 or an orifice) disposed in the flow path 113, and therefore can measure the differential pressure of the ejection material without diffusing it. Therefore, the flow rate of the ejection material can be calculated with high accuracy. The calculated flow rate is preferably used for various simulations of thermal runaway of a battery, for example, a simulation of the safety of a battery pack in which multiple batteries are connected.

[0063] Furthermore, by connecting the collection member 130 to the second opening 112 of the tubular member 110, the measurement of the ejected material by the differential pressure measurement unit and the collection of the ejected material can be performed simultaneously, and the flow rate can be calculated more accurately.

[0064] [Other embodiments] The above-mentioned embodiment does not limit the configuration of the present disclosure. Therefore, the above-mentioned embodiment may omit, replace, or add components of each part of the above-mentioned embodiment based on the description in this specification and common technical knowledge, and it should be construed that all of them belong to the scope of the present disclosure.

[0065] The pitot tube disposed in the cylindrical member may be L-shaped.

[0066] Although a substantially straight tubular member is illustrated in FIGS. 1 and 2, the tubular member may be curved, or may have a combination of straight and curved portions.

[0067] 3, 4, and 5, the connection portion of the casing is shown as being substantially circular in plan view. That is, the cross section of the cylindrical member is shown as being substantially circular. As long as the cylindrical member can form a flow path, its cross section is not limited to being circular, and it may be elliptical, rectangular, polygonal, or the like. [Industrial Applicability]

[0068] The flow rate calculation device and flow rate calculation method disclosed herein can accurately determine the flow rate of material ejected from a battery, and the calculated flow rate can be suitably used in various simulations of thermal runaway of batteries, such as simulating the safety of a battery pack having multiple batteries connected together. [Explanation of symbols]

[0069] 100,200 Flow rate calculation device 110 Cylindrical member 111 First opening 112 Second Opening 113 Flow Path 120 Pitot tube 130 Collection member 210 Casing 211 Connection 212 Lid 212a hole part 212b Safety valve hole 212c,212d Lid concave part 212e,212f Lid insertion hole 212g 1st groove part 212h 2nd groove part 213 First Side 213a bottom part 213b Back part 213c,213d side part 213e recessed part 213f, 213g Heater insertion hole 214 Second Side 214a Groove section B battery B1,B2 electrode T Thermometer

Claims

1. a cylindrical member having a first opening and a second opening at both ends in a longitudinal direction and forming a flow path for material ejected from the battery; a flow rate calculation means including a differential pressure measurement unit disposed in the flow path; A flow rate calculation device comprising:

2. 2. The flow rate calculation device according to claim 1, 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.

3. 3. The flow rate calculation device according to claim 1, wherein the battery has a jetting portion that jets out a jet of material, and the first opening is directly connected to the jetting portion.

4. Further comprising a casing for housing the battery; The flow rate calculation device according to claim 1 or 2, wherein the casing has a connection portion that is connected to the first opening portion.

5. 3. The flow rate calculation device according to claim 1, wherein a collection member for collecting the ejected material is connected to the second opening.

6. 3. The flow rate calculation device according to claim 1, wherein the differential pressure measurement unit includes a Pitot tube or an orifice.

7. 7. The flow rate calculation device according to claim 6, wherein the Pitot tube is a Western type.

8. a cylindrical member having a first opening and a second opening at both ends in a longitudinal direction and constituting a flow path for material ejected from the battery; a flow rate calculation means including a differential pressure measurement unit disposed in the flow path; a casing that houses a battery and has a connection portion that is connected to the first opening; a collection member connected to the second opening and configured to collect the ejected material; A flow rate calculation device comprising:

9. A step of disposing a differential pressure measuring unit in a cylindrical member having a first opening and a second opening at both ends in a longitudinal direction; a step of placing a first opening of the cylindrical member in which the differential pressure measurement unit is disposed, facing a battery; generating heat in the battery or heating the battery to increase its temperature; measuring a differential pressure of an ejection material ejected from the battery whose temperature has increased with the differential pressure measuring unit; calculating the flow rate of the ejection material from the measured differential pressure; A flow rate calculation method comprising:

10. The flow rate calculation method according to claim 9 , further comprising the step of connecting a collection member that collects the ejected material to the second opening.

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