CN112665678A - Battery gas production amount measuring device and battery gas production amount measuring method - Google Patents
Battery gas production amount measuring device and battery gas production amount measuring method Download PDFInfo
- Publication number
- CN112665678A CN112665678A CN202011583749.5A CN202011583749A CN112665678A CN 112665678 A CN112665678 A CN 112665678A CN 202011583749 A CN202011583749 A CN 202011583749A CN 112665678 A CN112665678 A CN 112665678A
- Authority
- CN
- China
- Prior art keywords
- battery
- gas
- temperature
- inner cavity
- thermometer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000008859 change Effects 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims description 58
- 230000007246 mechanism Effects 0.000 claims description 32
- 238000004891 communication Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000013459 approach Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 176
- 238000005259 measurement Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Landscapes
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of batteries, and particularly discloses a battery gas production quantity measuring device and a battery gas production quantity measuring method. The device for measuring the gas production rate of the battery comprises a battery body, a guide pipe, a container, a barometer and a first thermometer, wherein one end of the guide pipe is communicated with the inside of the battery body, the other end of the guide pipe is communicated with an inner cavity of the container, the battery body, the guide pipe and the container are hermetically connected, a cavity opening of the inner cavity is provided with a piston part, the cavity opening of the inner cavity can be sealed and blocked by the piston part, the volume of the inner cavity can be changed when the piston part moves, the volume change of the inner cavity can change the temperature value and the pressure value of gas in the inner cavity, and the changed volume of the inner cavity is the gas production rate of the battery body when the temperature value and the. The device for measuring the gas production of the battery has the advantages of simple structure, low cost, high accuracy and small error.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery gas production rate measuring device and a battery gas production rate measuring method.
Background
Formation is a very important step in the battery manufacturing process. Gases such as CO2, CH4, C2H2 and H2 are generated in the formation process, and the existence of the gases can cause performance attenuation, internal resistance increase, expansion deformation and the like of the lithium ion battery. The formed gas has important influence on the electrochemical performance, the cycle performance, the safety performance and the like of the battery. At present, the method for measuring the formation gas production rate of the soft package battery is generally measured by a drainage method and an exhaust method:
1. the drainage method is to immerse the battery before formation into water, the rising volume of the water level is the original volume of the battery core before formation, and the difference value of the volume after formation and the volume before formation is the gas production of the battery. However, the volume of the battery cell is too large when the gas production rate is too large by a drainage method, and the battery cell cannot be completely immersed in water due to the action of buoyancy;
2. the exhaust method is to connect one end of the air bag with the inside of the battery before formation in a sealing way, the other end is connected with the top of the container, the container is filled with liquid which is not dissolved with the formation gas, and then a guide pipe is additionally arranged, one end of the guide pipe is arranged at the bottom of the container, and the other end of the guide pipe is arranged at the cavity opening of the measuring cylinder. In the process of forming the battery, gas generated by the battery is collected through the gas bag, the extruding mechanism is arranged on the outer side of the gas bag and is used for extruding the gas bag, exhausted gas is discharged into the top of the container to push liquid in the container to enter the measuring cylinder, and the volume of the gas generated is obtained by measuring the volume of the liquid in the measuring cylinder. The structure is complex and the cost is high, and when the gas bag has wrinkles during the gas production measurement of the battery core, errors can be caused to the measurement of the gas production, and when the gas bag can not be opened after the battery continues to produce gas, the gas bag does not increase the volume and increases the gas pressure, so that the gas production test is inaccurate.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a device for measuring a gas production rate of a battery, which has a simple structure, a low cost, a high accuracy and a small error.
Another objective of the embodiments of the present invention is to provide a method for measuring a gas production rate of a battery, which is simple to operate, high in accuracy and small in error.
Another objective of the embodiments of the present invention is to provide another method for measuring the amount of gas produced by a battery, which has high accuracy and small error.
To achieve the purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a device for measuring gas production of a battery is provided, which comprises a battery body, a conduit, a container, a barometer and a first thermometer, wherein one end of the conduit is communicated with the inside of the battery body, the other end of the conduit is communicated with an inner cavity of the container, the battery body, the conduit and the container are hermetically connected, the barometer is used for detecting a gas pressure value of the gas in the inner cavity, the first thermometer is used for detecting a gas temperature value of the inner cavity, a cavity opening of the inner cavity is provided with a piston part which can block the cavity opening of the inner cavity, the volume of the inner cavity can be changed when the piston part moves, the volume change of the inner cavity can change the temperature value and the gas pressure value of the gas in the inner cavity, and the temperature value and the gas pressure value of the gas in the inner cavity before and after gas production of the battery body are the, the variable volume of the inner cavity is the gas production rate of the battery body.
In a preferred embodiment of the battery gas production rate measuring device, the wall surface of the container is provided with a unit volume scale, and the moving direction of the piston portion is the same as the arrangement direction of the unit volume scale.
As a preferable mode of the device for measuring the amount of gas generated from the battery, the device further comprises a jig provided outside the battery body, and the jig is used for limiting the increase in volume of the battery body.
As a preferable mode of the battery gas production amount measuring device, the device further comprises a check valve provided in the conduit, and the check valve is used for blocking backflow of the gas in the container to the battery body.
As a preferable scheme of the battery gas production amount measuring device, the battery gas production amount measuring device further comprises a second thermometer and a temperature adjusting mechanism which are arranged on the outer wall of the guide pipe, the first thermometer and the second thermometer are respectively in communication connection with the temperature adjusting mechanism, the second thermometer is used for obtaining the temperature of the guide pipe, the temperature adjusting mechanism can compare the temperature value obtained by the first thermometer with the temperature value obtained by the second thermometer, and the temperature adjusting mechanism can increase or decrease the temperature of the guide pipe, so that the temperature of the formed gas passing through the guide pipe in the battery body is close to the temperature of the gas in the inner cavity before the formation of the battery body.
As a preferred scheme of the battery gas production measuring device, the device also comprises a heat insulation layer wrapped on the outer side wall of the container.
In a second aspect, a method for measuring the amount of gas produced by a battery is provided, which comprises:
the method comprises the following steps of connecting a battery body, a conduit, a container, a barometer and a first thermometer in advance before the battery body is formed;
recording a first air pressure value of the barometer in communication with the inner cavity, a first temperature value of the first thermometer in communication with the inner cavity, and an original position of the piston portion;
after the battery body is formed, recording a second air pressure value of the barometer and a second temperature value of the first thermometer;
driving the piston part to move so that the second air pressure value is in a preset air pressure range including the first air pressure value, and the second temperature value is in a preset temperature range including the first temperature value;
when the second air pressure value and the first air pressure value are located in the preset air pressure range and the second temperature value and the first temperature value are located in the preset temperature range, the target position of the piston part after moving is recorded, and the gas production rate of the battery body is calculated according to the distance between the target position and the original position and the pre-acquired sectional area of the inner cavity.
As a preferable scheme of the method for measuring the gas production of the battery, the wall surface of the container is provided with unit volume scales, and the moving direction of the piston part is the same as the arrangement direction of the unit volume scales;
the step of registering the home position of the piston portion comprises: acquiring an original unit volume scale value of the piston part;
the step of recording the target position of the piston part after moving, and calculating the gas production of the battery body according to the distance between the target position and the original position and the pre-acquired sectional area of the inner cavity comprises the following steps: and acquiring a target unit volume scale value of the piston part, calculating a difference value between the target unit volume scale value and the original unit volume scale value, and acquiring a volume corresponding to the unit volume scale so as to obtain the gas production rate of the battery body.
As a preferable scheme of the method for measuring the gas production of the battery, a second thermometer and a temperature adjusting mechanism are arranged on the outer wall of the conduit, the first thermometer and the second thermometer are respectively in communication connection with the temperature adjusting mechanism, and the method further comprises:
acquiring a third temperature value of the second thermometer in the formation process of the battery body;
and driving the temperature adjusting mechanism to increase or decrease the temperature of the conduit according to the first temperature value and the third temperature value, so that the third temperature value is in the preset temperature range.
In a third aspect, a method for measuring gas production from a battery is provided, which includes:
acquiring internal initial pressure and internal initial temperature of the battery before formation, internal pressure and internal temperature of the battery during formation and formation time of the battery; wherein the battery is an airless bag type soft package battery;
and determining the gas production of the battery at the formation time according to the internal initial pressure, the internal initial temperature, the internal pressure, the internal temperature and the formation time of the battery.
The embodiment of the invention has the beneficial effects that:
form battery gas production measuring device through setting up battery body, pipe, container, barometer and first thermometer, wherein, the inside of one end intercommunication battery body of pipe, sealing connection between the inner chamber of other end intercommunication container, battery body, pipe and the container for battery body becomes the inner chamber that the gas that the in-process produced can get into the container through the pipe. Furthermore, the barometer is used for detecting the atmospheric pressure value of the gas of inner chamber, and first thermometer is used for detecting the gaseous temperature value of inner chamber, and after the inner chamber that the formation gas got into the container of battery body, because the gas of inner chamber is compressed can improve atmospheric pressure and temperature, can measure the atmospheric pressure change and the temperature variation of the gas of inner chamber through setting up barometer and first thermometer at the inner chamber. In addition, a piston part is arranged at the cavity opening of the inner cavity of the container, the piston part can seal the cavity opening of the inner cavity, when the piston part moves, the volume of the inner cavity can be changed, so that the temperature value and the air pressure value of the gas in the inner cavity are changed, according to the Clarpelen equation pV which is nRT, wherein R is a general gas constant, and when the temperature T and the pressure p are constant, the ratio of the gas volume V is the same as the ratio of the amount n of the substance contained in the gas. Therefore, when the temperature value and the pressure value of the gas in the inner cavity before and after the gas generation of the battery body are the same, the change volume of the inner cavity is the volume of the gas entering the inner cavity of the container after the battery body is formed, namely the gas generation amount of the battery body. The battery gas production measuring device provided by the embodiment of the invention has the advantages that the volume of the formed gas of the battery body is measured without a drainage method and an exhaust method, the battery body before formation is not required to be immersed in water, the gas bag is not required to be arranged to collect the formed gas and extrude the gas bag to indirectly measure the gas volume, and the drainage method and the exhaust method have larger errors.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of a device for measuring a gas production rate of a battery according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a device for measuring a gas production rate of a battery according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a device for measuring a gas production rate of a battery according to another embodiment of the present invention.
Fig. 4 is a flowchart of a method for measuring a gas production rate of a battery according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method for measuring a gas production rate of a battery according to another embodiment of the present invention.
In the figure:
1. a battery body; 2. a conduit; 3. a container; 31. an inner cavity; 32. a piston portion; 33. a unit volume scale; 4. a barometer; 5. a first thermometer; 6. a clamp; 7. a one-way valve; 8. a second thermometer; 9. a temperature adjustment mechanism; 10. and (7) an insulating layer.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, an embodiment of the present invention provides a device for measuring a gas production from a battery, including a battery body 1, a conduit 2, a container 3, a barometer 4, and a first thermometer 5, wherein one end of the conduit 2 is communicated with the inside of the battery body 1, the other end is communicated with an inner cavity 31 of the container 3, the battery body 1, the conduit 2, and the container 3 are hermetically connected, the barometer 4 is configured to detect a gas pressure value of the inner cavity 31, the first thermometer 5 is configured to detect a temperature value of the gas in the inner cavity 31, a piston portion 32 is disposed at a port of the inner cavity 31, the piston portion 32 is capable of sealing the port of the inner cavity, and when the piston part 32 moves, the volume of the inner cavity 31 can be changed, the volume change of the inner cavity 31 can change the temperature value and the air pressure value of the air in the inner cavity 31, when the temperature value and the pressure value of the gas in the inner cavity 31 before and after gas production of the battery body 1 are the same, the variable volume of the inner cavity 31 is the gas production rate of the battery body 1.
The embodiment of the invention forms the device for measuring the gas generated by the battery by arranging the battery body 1, the conduit 2, the container 3, the barometer 4 and the first thermometer 5, wherein one end of the conduit 2 is communicated with the inside of the battery body 1, the other end of the conduit 2 is communicated with the inner cavity 31 of the container 3, and the battery body 1, the conduit 2 and the container 3 are hermetically connected, so that the gas generated in the formation process of the battery body 1 can enter the inner cavity 31 of the container 3 through the conduit 2. Further, the barometer 4 is used for detecting the pressure value of the gas in the cavity 31, the first thermometer 5 is used for detecting the temperature value of the gas in the cavity 31, and after the formed gas of the battery body 1 enters the cavity 31 of the container 3, the gas in the cavity 31 is compressed to increase the pressure and the temperature, so that the pressure change and the temperature change of the gas in the cavity 31 can be measured by arranging the barometer 4 and the first thermometer 5 in the cavity 31.
Further, the piston portion 32 is provided at the opening of the cavity 31 of the container 3, the piston portion 32 can close the opening of the cavity 31, and when the piston portion 32 moves, the volume of the cavity 31 can be changed to change the temperature value and the gas pressure value of the gas in the cavity 31, and according to the clepelone equation pV ═ nRT where R is a general gas constant, and when the temperature T and the pressure p are constant, the ratio of the gas volume V is the same as the ratio of the amount n of the substance contained in the gas. Therefore, when the temperature value and the pressure value of the gas in the inner cavity 31 before and after the gas generation of the battery body 1 are the same, the change volume of the inner cavity 31 is the volume of the gas entering the inner cavity 31 of the container 3 after the formation of the battery body 1, that is, the gas generation amount of the battery body 1.
The volume of the formed gas of the battery body 1 is measured by a drainage method and an exhaust method, the battery body 1 before formation is not required to be immersed in water, an air bag is not required to be arranged to collect the formed gas and extrude the air bag to indirectly measure the gas volume, and the drainage method and the exhaust method have larger errors.
The variable volume of the cavity 31 of the container 3 may be obtained in various ways, for example, by obtaining the sectional area of the cavity 31 in advance, obtaining the initial position of the piston portion 32 before the battery body 1 is formed and the target position of the piston portion 32 after the battery body 1 is formed, and calculating the variable volume of the cavity 31 from the distance between the initial position and the target position and the sectional area of the cavity 31.
In order to increase the efficiency of acquiring the variable volume of the cavity 31, in an embodiment, referring to fig. 1, the wall surface of the container 3 is provided with unit volume scales 33, the moving direction of the piston portion 32 is the same as the arrangement direction of the unit volume scales 33, the distance between every two adjacent unit volume scales 33 indicates the unit volume corresponding to the unit volume scales 33, the number of the unit volume scales 33 between the original unit volume scales 33 and the target unit volume scales 33 is calculated by acquiring the original unit volume scales 33 corresponding to the piston portion 32 before the formation of the battery body 1, acquiring the target unit volume scales 33 corresponding to the piston portion 32 again after the formation of the battery body 1, and calculating the variable volume of the cavity 31 from the unit volume corresponding to each unit volume scale 33, thereby increasing the efficiency of acquiring the variable volume of the cavity 31.
In another embodiment, referring to fig. 2, the device for measuring the amount of generated gas from a battery according to the embodiment of the present invention further includes a clamp 6 disposed outside the battery body 1, wherein the clamp 6 is used to limit the increase of the volume of the battery body 1, so as to prevent the increase of the volume of the battery body 1 due to the generation of gas from the battery body 1 during the formation process, thereby increasing the amount of the formed gas entering the container 3 and further reducing the measurement error.
In addition, referring to fig. 2, the device for measuring the amount of generated gas from a battery according to the embodiment of the present invention further includes a check valve 7 disposed in the conduit 2, and the check valve 7 is also called a check valve or a check valve, and is a directional control valve in which the gas flow can only flow in one direction but not in the opposite direction. The check valve 7 in this embodiment is used to block the gas in the container 3 from flowing back to the battery body 1, and also to increase the amount of the formed gas entering the container 3.
In particular, referring to fig. 3, the device for measuring the amount of gas generated by a battery according to the embodiment of the present invention further includes a second thermometer 8 and a temperature adjustment mechanism 9 disposed on an outer wall of the conduit 2, the first thermometer 5 and the second thermometer 8 are respectively in communication connection with the temperature adjustment mechanism 9, the first thermometer 5 is configured to obtain a temperature of the gas in the inner cavity 31, the second thermometer 8 is configured to obtain a temperature of the conduit 2, the temperature adjustment mechanism 9 is configured to compare a temperature value obtained by the first thermometer 5 with a temperature value obtained by the second thermometer 8, when there is a difference between the temperature value of the second thermometer 8 and the temperature value of the first thermometer 5, the temperature adjustment mechanism 9 is configured to raise or lower the temperature of the conduit 2, so that the temperature of the formed gas passing through the conduit 2 in the battery body 1 is close to the temperature of the gas in the inner cavity 31 before formation of the battery body 1, and the temperature difference between, further, the temperature difference at the same pressure in the inner space after the piston portion 32 moves can be reduced, and the measurement error can be further reduced.
More preferably, during the formation of the battery, the temperature adjustment mechanism 9 and the piston portion 32 are simultaneously started to move, so that the temperature and the air pressure of the gas in the cavity 31 are kept to be the same as those before the formation of the battery body 1, the temperature difference and the air pressure difference between the gas generated by the battery body 1 and the gas in the cavity 31 can be reduced, the variable interference is generated when the piston portion 32 is driven to move relative to the cavity 31, the return of the gas in the cavity 31 to the air pressure and the temperature before the formation of the battery body 1 after the formation of the battery body 1 is accelerated, and the efficiency of obtaining the change volume of the cavity 31 is accelerated. Because the variable volume in the inner cavity 31 is the gas production rate of the battery body 1, the gas production rate in the formation process of the battery body 1 or different SOC (State of charge) can be obtained in real time, so that the reaction generated in the overcharge of the electrolyte formation can be conveniently researched, and the optimization of the formation system is assisted.
Optionally, referring to fig. 3, the device for measuring the amount of gas generated from the battery according to the embodiment of the present invention further includes an insulating layer 10 wrapped on the outer side wall of the container 3, where the insulating layer 10 can reduce heat exchange between the container 3 and an external environment, reduce test variables of the device for measuring the amount of gas generated from the battery according to the embodiment of the present invention, and further improve accuracy of testing the amount of gas generated from the battery.
Referring to fig. 4, an embodiment of the present invention further provides a method for measuring a gas production rate of a battery, which is applied to the device for measuring a gas production rate of a battery according to any of the above embodiments, including:
s101, before the battery body 1 is formed, the battery body 1, the duct 2, the container 3, the barometer 4 and the first thermometer 5 are connected in advance;
s102, recording a first air pressure value of the barometer 4 communicated with the inner cavity 31, a first temperature value of the first thermometer 5 communicated with the inner cavity 31 and an original position of the piston part 32;
s103, after the formation of the battery body 1 is finished, recording a second air pressure value of the barometer 4 and a second temperature value of the first thermometer 5;
s104, driving the piston part 32 to move so that the second air pressure value is in a preset air pressure range including the first air pressure value, and the second temperature value is in a preset temperature range including the first temperature value;
and S105, when the second air pressure value is within the preset air pressure range and the second temperature value is within the preset temperature range, recording the target position of the piston part 32 after moving, and calculating the gas production of the battery body 1 according to the distance between the target position and the original position and the pre-acquired sectional area of the inner cavity 31.
In the embodiment of the present invention, after the formed gas of the battery body 1 enters the inner cavity 31 of the container 3, the gas in the inner cavity 31 is compressed to increase the gas pressure and the temperature, and the gas pressure change and the temperature change of the gas in the inner cavity 31 can be measured by the barometer 4 and the first thermometer 5 arranged in the inner cavity 31. When the piston portion 32 moves, the volume of the cavity 31 can be changed to change the temperature value and the gas pressure value of the gas in the cavity 31, and when the temperature T and the pressure p are constant, the ratio of the gas volume V is the same as the ratio of the amount n of the substance contained in the gas according to the krabbelong equation pV — nRT where R is a general gas constant. Thus, by actuating the piston portion 32 to move, the second air pressure value and the second temperature value can be changed. When the gaseous second atmospheric pressure value of inner chamber 31 was located the predetermined atmospheric pressure scope including the first atmospheric pressure value before battery body 1 formed to the second temperature value was located the predetermined temperature range including the first temperature value before battery body 1 formed, the change volume of inner chamber 31 was the gaseous volume of the inner chamber 31 of entering container 3 after battery body 1 formed, also be exactly battery body 1's gas production, compare traditional drainage and exhaust method, can obtain more accurate battery body 1's gas production, avoid increasing measuring error.
The gas production amount measuring device in this embodiment may have the same structure and achieve the same effect as the gas production amount measuring device in the above embodiment, and details are not repeated in this embodiment.
Further, referring to fig. 2, the wall surface of the container 3 is provided with unit volume scales 33, the moving direction of the piston portion 32 is the same as the arrangement direction of the unit volume scales 33, and the distance between every two adjacent unit volume scales 33 indicates the unit volume corresponding to the unit volume scales 33, and referring to fig. 5, in the method for measuring the amount of gas generated from the battery according to the embodiment of the present invention, the step of recording the original position of the piston portion 32 includes:
acquiring an original unit volume scale value of the piston portion 32;
similarly, the step of recording the target position of the piston 32 after the movement and calculating the gas production rate of the battery body 1 based on the distance between the target position and the home position and the sectional area of the internal cavity 31 acquired in advance includes:
the target unit volume scale value of the piston portion 32 is obtained, the difference between the target unit volume scale value and the original unit volume scale value is calculated, and the volume corresponding to the unit volume scale 33 is obtained, so that the gas production rate of the battery body 1 is obtained.
In the embodiment of the present invention, the original unit volume scales 33 corresponding to the piston portion 32 are obtained before the battery body 1 is formed, the target unit volume scales 33 corresponding to the piston portion 32 are obtained again after the battery body 1 is formed, the number of the unit volume scales 33 between the original unit volume scales 33 and the target unit volume scales 33 is calculated, and the variable volume of the inner cavity 31 is calculated from the unit volume corresponding to each unit volume scale 33, so that the obtaining efficiency of the variable volume of the inner cavity 31 can be increased.
In one embodiment, with continued reference to fig. 2 and 5, a one-way valve 7 is disposed in the conduit 2, and the method for measuring the amount of gas generated by a battery according to the embodiment of the present invention further includes:
before the formation of the battery body 1, the check valve 7 is opened to block the gas in the container 3 from flowing back to the battery body 1.
The check valve 7 in this embodiment is used to block the gas in the container 3 from flowing back to the battery body 1, and also to increase the amount of the formed gas entering the container 3.
In another embodiment, with continuing reference to fig. 2 and 5, the outer wall of the conduit 2 is provided with a second thermometer 8 and a temperature adjusting mechanism 9, the first thermometer 5 and the second thermometer 8 are respectively connected to the temperature adjusting mechanism 9 in a communication manner, and the method for measuring the amount of gas produced by the battery according to the embodiment of the present invention further includes:
acquiring a third temperature value of the second thermometer 8 in the formation process of the battery body 1;
according to the first temperature value and the third temperature value, the temperature regulating mechanism 9 is driven to increase or decrease the temperature of the conduit 2, so that the third temperature value is in a preset temperature range including the first temperature value.
In the embodiment of the invention, when the third temperature value of the second thermometer 8 is different from the first temperature value of the first thermometer 5, the temperature regulating mechanism 9 can raise or lower the temperature of the conduit 2, so that the temperature of the formed gas passing through the conduit 2 in the battery body 1 is close to the temperature of the gas in the inner cavity 31 before the battery body 1 is formed, the temperature difference between the formed gas and the original gas in the inner cavity 31 can be reduced, the temperature difference under the same pressure in the inner cavity after the piston part 32 moves is further reduced, and the measurement error can be further reduced.
Specifically, referring to fig. 5, the method for measuring the amount of gas generated from a battery according to the embodiment of the present invention further includes:
in the battery formation process, the temperature adjustment mechanism 9 and the piston portion 32 are simultaneously started to move, so that the second temperature value of the gas in the inner cavity 31 is kept at the preset temperature threshold value and the second air pressure value is kept at the preset air pressure threshold value.
Because the volume of change in inner chamber 31 is the gas production of battery body 1, second temperature value through keeping the gas in inner chamber 31 is located and predetermines the temperature threshold and the second atmospheric pressure value is located and predetermine the atmospheric pressure threshold, can reduce the temperature difference and the atmospheric pressure difference of the gas that battery body 1 produced and the gas in inner chamber 31, variable interference when drive piston portion 32 moves relative to inner chamber 31 for the gas in inner chamber 31 returns atmospheric pressure and temperature before battery body 1 becomes after battery body 1 becomes, thereby accelerate the efficiency of obtaining the volume of change of inner chamber 31. The method for measuring the gas production rate of the battery can reduce the gas production rate obtained in real time in the formation process of the battery body 1 or different SOC (State of Charge) so as to research the reaction generated in the electrolyte formation overcharge and play an auxiliary role in optimizing the formation system.
Referring to fig. 5, another method for measuring the amount of generated battery gas applied to the apparatus for measuring the amount of generated battery gas according to any of the above embodiments is provided, including:
s201, before the battery body 1 is formed, the battery body 1, a conduit 2, a container 3, a barometer 4 and a first thermometer 5 are connected in advance, unit volume scales 33 are arranged on the wall surface of the container 3, the moving direction of a piston part 32 is the same as the arrangement direction of the unit volume scales 33, the distance between every two adjacent unit volume scales 33 indicates the unit volume corresponding to the unit volume scales 33, a second thermometer 8 and a temperature regulating mechanism 9 are arranged on the outer wall of the conduit 2, the first thermometer 5 and the second thermometer 8 are respectively in communication connection with the temperature regulating mechanism 9, a one-way valve 7 is arranged in the conduit 2, and the one-way valve 7 is opened to prevent the gas in the container 3 from flowing back to the battery body 1;
s202, recording a first air pressure value of the barometer 4 communicated with the inner cavity 31 and a first temperature value of the first thermometer 5 communicated with the inner cavity 31, and acquiring an original unit volume scale value of the piston part 32;
s203, acquiring a third temperature value of the second thermometer 8 in the formation process of the battery body 1; driving the temperature regulating mechanism 9 to increase or decrease the temperature of the conduit 2 according to the first temperature value and the third temperature value, so that the third temperature value is at a preset temperature threshold value including the first temperature value; simultaneously, the temperature adjusting mechanism 9 and the piston part 32 are started to move, so that the second temperature value of the gas in the inner cavity 31 is kept at the preset temperature threshold value, and the second air pressure value is kept at the preset air pressure threshold value.
S204, after the formation of the battery body 1 is finished, recording a second air pressure value of the barometer 4 and a second temperature value of the first thermometer 5;
s205, driving the piston portion 32 to move, so that the second air pressure value is within a preset air pressure range including the first air pressure value, and the second temperature value is within a preset temperature range including the first temperature value;
and S206, when the second air pressure value is within the preset air pressure range and the second temperature value is within the preset temperature range, acquiring a target unit volume scale value of the piston part 32, calculating a difference value between the target unit volume scale value and the original unit volume scale value, and acquiring a volume corresponding to the unit volume scale 33, so as to obtain the gas production rate of the battery body 1.
The device for measuring the amount of gas generated from the battery in this embodiment may have the same structure and achieve the same effects as the device for measuring the amount of gas generated from the battery in the above embodiment, and the method for measuring the amount of gas generated from the battery in this embodiment may have the same steps and achieve the same effects as the method for measuring the amount of gas generated from the battery in the above embodiment, and will not be described again in this embodiment.
In addition, another method for measuring the amount of gas produced by a battery is provided in the embodiments of the present invention, which includes:
s301, obtaining the internal initial pressure and the internal initial temperature of the battery before formation, and then obtaining the internal pressure, the internal temperature and the formation time of the battery during formation; wherein the battery is an airless bag type soft package battery;
s302, determining the gas production of the battery during the formation time of the battery according to the internal initial pressure of the battery, the internal initial temperature of the battery, the internal pressure of the battery, the internal temperature of the battery and the formation time of the battery.
According to the embodiment of the invention, the internal pressure and the internal temperature of the battery during formation are compared with the internal initial pressure and the internal initial temperature of the battery which are obtained in advance before formation by obtaining the internal pressure and the internal temperature of the battery during formation, the internal pressure and the internal temperature of the battery are enabled to be the same as the internal initial pressure and the internal initial temperature of the battery by changing the internal volume of the battery, and the gas production rate of the battery in formation time can be obtained by obtaining the internal volume change of the battery at the moment. Compared with the traditional drainage method and the traditional exhaust method, the method can obtain more accurate gas production of the battery and avoid increasing measurement errors.
In this embodiment, a pressure gauge may be disposed in the battery to obtain the internal initial pressure and the internal pressure before formation of the battery, a thermometer may also be disposed to obtain the internal initial temperature and the internal temperature after formation of the battery, a piston structure may also be disposed in the battery to change the internal volume of the battery, and even a scale may also be disposed on the piston mechanism to obtain the internal volume change amount of the battery, and the structure of the piston mechanism may be similar to the structures of the barometer 4, the first thermometer 5, the piston portion 32, and the unit volume scale 33 in the above embodiment, which is not specifically limited in this embodiment and will not be described again.
In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in a descriptive sense or a positional relationship based on the orientation shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. A battery gas production measuring device is characterized by comprising a battery body, a guide pipe, a container, a barometer and a first thermometer, wherein one end of the guide pipe is communicated with the inside of the battery body, the other end of the guide pipe is communicated with an inner cavity of the container, the battery body, the guide pipe and the container are connected in a sealing manner, the barometer is used for detecting the gas pressure value of the gas in the inner cavity, the first thermometer is used for detecting the gas temperature value of the inner cavity, a cavity opening of the inner cavity is provided with a piston part which can seal the cavity opening of the inner cavity, the volume of the inner cavity can be changed when the piston part moves, the volume change of the inner cavity can change the temperature value and the gas pressure value of the gas in the inner cavity, the temperature value and the gas pressure value of the gas in the inner cavity before and after the gas production of the battery body are the same, the variable volume of the inner cavity is the gas production rate of the battery body.
2. The battery gas production amount measuring device according to claim 1, wherein a wall surface of the container is provided with a unit volume scale, and a moving direction of the piston portion is the same as an arrangement direction of the unit volume scale.
3. The battery gas production amount measuring device according to claim 1, further comprising a jig provided outside the battery body, the jig being for restricting an increase in volume of the battery body.
4. The battery gas production amount measuring device according to claim 1, further comprising a check valve provided in the conduit for blocking backflow of the gas of the container to the battery body.
5. The battery gas production amount measuring device according to claim 1, further comprising a second thermometer and a temperature adjustment mechanism provided on an outer wall of the duct, wherein the first thermometer and the second thermometer are respectively in communication connection with the temperature adjustment mechanism, the second thermometer is configured to acquire a temperature of the duct, the temperature adjustment mechanism is configured to compare a temperature value acquired by the first thermometer with a temperature value acquired by the second thermometer, and the temperature adjustment mechanism is configured to raise or lower a temperature of the duct so that a temperature of the gas in the battery body passing through the duct approaches a temperature of the gas in the internal cavity before the battery body is formed.
6. The device for measuring the amount of gas generated from a battery according to claim 1, further comprising an insulating layer covering the outer side wall of the container.
7. A method for measuring a quantity of produced gas of a battery, which is applied to the quantity-of-produced gas measuring apparatus according to any one of claims 1 to 6, comprising:
the method comprises the following steps of connecting a battery body, a conduit, a container, a barometer and a first thermometer in advance before the battery body is formed;
recording a first air pressure value of the barometer in communication with the inner cavity, a first temperature value of the first thermometer in communication with the inner cavity, and an original position of the piston portion;
after the battery body is formed, recording a second air pressure value of the barometer and a second temperature value of the first thermometer;
driving the piston part to move so that the second air pressure value is in a preset air pressure range including the first air pressure value, and the second temperature value is in a preset temperature range including the first temperature value;
when the second air pressure value is within the preset air pressure range and the second temperature value is within the preset temperature range, the target position of the piston part after moving is recorded, and the gas production of the battery body is calculated according to the distance between the target position and the original position and the pre-acquired sectional area of the inner cavity.
8. The method for measuring the amount of gas produced by the battery according to claim 7, wherein a wall surface of the container is provided with a unit volume scale, and a moving direction of the piston portion is the same as an arrangement direction of the unit volume scale;
the step of registering the home position of the piston portion comprises: acquiring an original unit volume scale value of the piston part;
the step of recording the target position of the piston part after moving, and calculating the gas production of the battery body according to the distance between the target position and the original position and the pre-acquired sectional area of the inner cavity comprises the following steps: and acquiring a target unit volume scale value of the piston part, calculating a difference value between the target unit volume scale value and the original unit volume scale value, and acquiring a volume corresponding to the unit volume scale so as to obtain the gas production rate of the battery body.
9. The method according to claim 7, wherein a second thermometer and a temperature adjustment mechanism are provided on an outer wall of the duct, and the first thermometer and the second thermometer are respectively connected to the temperature adjustment mechanism in a communication manner, and the method further comprises:
acquiring a third temperature value of the second thermometer in the formation process of the battery body;
and driving the temperature adjusting mechanism to increase or decrease the temperature of the conduit according to the first temperature value and the third temperature value, so that the third temperature value is in the preset temperature range.
10. A method for measuring the amount of gas produced by a battery, comprising:
acquiring internal initial pressure and internal initial temperature of the battery before formation, internal pressure and internal temperature of the battery during formation and formation time of the battery; wherein the battery is an airless bag type soft package battery;
and determining the gas production of the battery at the formation time according to the internal initial pressure, the internal initial temperature, the internal pressure, the internal temperature and the formation time of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011583749.5A CN112665678A (en) | 2020-12-28 | 2020-12-28 | Battery gas production amount measuring device and battery gas production amount measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011583749.5A CN112665678A (en) | 2020-12-28 | 2020-12-28 | Battery gas production amount measuring device and battery gas production amount measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112665678A true CN112665678A (en) | 2021-04-16 |
Family
ID=75411302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011583749.5A Pending CN112665678A (en) | 2020-12-28 | 2020-12-28 | Battery gas production amount measuring device and battery gas production amount measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112665678A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654615A (en) * | 2021-07-20 | 2021-11-16 | 北京理工大学 | Device and method for testing real-time gas production rate in battery |
Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05134218A (en) * | 1991-11-14 | 1993-05-28 | Hagumu Hirano | Precision phase adjuster of light wave by air temperature control |
| DE20115657U1 (en) * | 2001-09-24 | 2002-01-17 | Schmid Heinrich | Liquid nitrogen motor and / or liquid air motor |
| CN1916652A (en) * | 2006-07-25 | 2007-02-21 | 天津力神电池股份有限公司 | Method for detecting gas production rate inside lithium ion battery, and detection device |
| CN101330155A (en) * | 2007-06-15 | 2008-12-24 | 通用汽车环球科技运作公司 | Anode bleed control strategy for improved water management and hydrogen utilization |
| CN201188018Y (en) * | 2008-04-11 | 2009-01-28 | 宁波伊司达锂电池有限公司 | Aerogenesis collection and detection apparatus within lithium ion battery |
| DE102008050536A1 (en) * | 2007-10-05 | 2009-05-20 | Kompetenzzentrum - Das Virtuelle Fahrzeug Forschungsgesellschaft Mbh | Temperature-controlled in-situ gas pressure measurement for electrochemical systems |
| CN102116197A (en) * | 2011-01-11 | 2011-07-06 | 北京理工大学 | Linear internal combustion engine-based mixed energy conversion device |
| CN102166928A (en) * | 2010-06-02 | 2011-08-31 | 孙风举 | Hybrid vertically lifting type three-purpose vehicle for land, water and air |
| US20130052557A1 (en) * | 2010-05-12 | 2013-02-28 | Toyota Jidosha Kabushiki Kaisha | Fuel cell system, method for supplying fuel gas therein, and mobile body |
| CN103674768A (en) * | 2013-11-22 | 2014-03-26 | 深圳市迪凯特电池科技有限公司 | Gas production amount detection method and measuring device during lithium ion battery formation |
| CN104807720A (en) * | 2015-05-20 | 2015-07-29 | 闫语童 | Method for measuring object density based on air pressure process |
| CN204807156U (en) * | 2015-04-18 | 2015-11-25 | 李锋 | Gas dosing detection device |
| CN107941300A (en) * | 2017-12-19 | 2018-04-20 | 华霆（合肥）动力技术有限公司 | Aerogenesis measuring method and frock |
| CN109309265A (en) * | 2017-07-29 | 2019-02-05 | 深圳格林德能源有限公司 | A kind of smooth improvement chemical synthesis technology of high voltage polymer Li-ion battery |
| CN109962190A (en) * | 2017-12-26 | 2019-07-02 | 比亚迪股份有限公司 | Battery pack and vehicle |
| CN209296072U (en) * | 2018-12-04 | 2019-08-23 | 西安航天三沃机电设备有限责任公司 | A kind of volume measurement device for cavity inner cavity |
| CN209418617U (en) * | 2019-03-28 | 2019-09-20 | 长兴太湖能谷科技有限公司 | Battery pack intelligence pressure relief device |
| CN110470424A (en) * | 2019-07-25 | 2019-11-19 | 清华大学 | The experimental method of in situ measurement inside battery pressure |
| CN110797548A (en) * | 2019-10-09 | 2020-02-14 | 天津大学 | Foam fuel cell without cathode gas diffusion layer |
| RU2715132C1 (en) * | 2019-10-23 | 2020-02-25 | Виталий Викторович Нечаев | Method of diagnosing parts of cylinder-piston group and gas distributing mechanism of engine |
| CN110836704A (en) * | 2019-11-12 | 2020-02-25 | 远东福斯特新能源有限公司 | Device for measuring internal gas production of lithium ion battery |
-
2020
- 2020-12-28 CN CN202011583749.5A patent/CN112665678A/en active Pending
Patent Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05134218A (en) * | 1991-11-14 | 1993-05-28 | Hagumu Hirano | Precision phase adjuster of light wave by air temperature control |
| DE20115657U1 (en) * | 2001-09-24 | 2002-01-17 | Schmid Heinrich | Liquid nitrogen motor and / or liquid air motor |
| CN1916652A (en) * | 2006-07-25 | 2007-02-21 | 天津力神电池股份有限公司 | Method for detecting gas production rate inside lithium ion battery, and detection device |
| CN101330155A (en) * | 2007-06-15 | 2008-12-24 | 通用汽车环球科技运作公司 | Anode bleed control strategy for improved water management and hydrogen utilization |
| DE102008050536A1 (en) * | 2007-10-05 | 2009-05-20 | Kompetenzzentrum - Das Virtuelle Fahrzeug Forschungsgesellschaft Mbh | Temperature-controlled in-situ gas pressure measurement for electrochemical systems |
| CN201188018Y (en) * | 2008-04-11 | 2009-01-28 | 宁波伊司达锂电池有限公司 | Aerogenesis collection and detection apparatus within lithium ion battery |
| US20130052557A1 (en) * | 2010-05-12 | 2013-02-28 | Toyota Jidosha Kabushiki Kaisha | Fuel cell system, method for supplying fuel gas therein, and mobile body |
| CN102166928A (en) * | 2010-06-02 | 2011-08-31 | 孙风举 | Hybrid vertically lifting type three-purpose vehicle for land, water and air |
| CN102116197A (en) * | 2011-01-11 | 2011-07-06 | 北京理工大学 | Linear internal combustion engine-based mixed energy conversion device |
| CN103674768A (en) * | 2013-11-22 | 2014-03-26 | 深圳市迪凯特电池科技有限公司 | Gas production amount detection method and measuring device during lithium ion battery formation |
| CN204807156U (en) * | 2015-04-18 | 2015-11-25 | 李锋 | Gas dosing detection device |
| CN104807720A (en) * | 2015-05-20 | 2015-07-29 | 闫语童 | Method for measuring object density based on air pressure process |
| CN109309265A (en) * | 2017-07-29 | 2019-02-05 | 深圳格林德能源有限公司 | A kind of smooth improvement chemical synthesis technology of high voltage polymer Li-ion battery |
| CN107941300A (en) * | 2017-12-19 | 2018-04-20 | 华霆（合肥）动力技术有限公司 | Aerogenesis measuring method and frock |
| CN109962190A (en) * | 2017-12-26 | 2019-07-02 | 比亚迪股份有限公司 | Battery pack and vehicle |
| CN209296072U (en) * | 2018-12-04 | 2019-08-23 | 西安航天三沃机电设备有限责任公司 | A kind of volume measurement device for cavity inner cavity |
| CN209418617U (en) * | 2019-03-28 | 2019-09-20 | 长兴太湖能谷科技有限公司 | Battery pack intelligence pressure relief device |
| CN110470424A (en) * | 2019-07-25 | 2019-11-19 | 清华大学 | The experimental method of in situ measurement inside battery pressure |
| CN110797548A (en) * | 2019-10-09 | 2020-02-14 | 天津大学 | Foam fuel cell without cathode gas diffusion layer |
| RU2715132C1 (en) * | 2019-10-23 | 2020-02-25 | Виталий Викторович Нечаев | Method of diagnosing parts of cylinder-piston group and gas distributing mechanism of engine |
| CN110836704A (en) * | 2019-11-12 | 2020-02-25 | 远东福斯特新能源有限公司 | Device for measuring internal gas production of lithium ion battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654615A (en) * | 2021-07-20 | 2021-11-16 | 北京理工大学 | Device and method for testing real-time gas production rate in battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106525190B (en) | The device scale method of detection cylinder lithium ion battery gas production | |
| CN105806766A (en) | Flexible wall permeameter capable of measuring volume changes | |
| CN206479622U (en) | A kind of measurement apparatus of inner pressure of battery and gas production | |
| CN112665678A (en) | Battery gas production amount measuring device and battery gas production amount measuring method | |
| CN113432760B (en) | Battery isothermal calorimeter based on power compensation method and baseline correction method thereof | |
| CN113991149B (en) | Fuel cell stack inlet air temperature testing method and device and storage medium | |
| CN115863706A (en) | Leak detection diagnosis system for fuel cell stack and control method thereof | |
| CN212254508U (en) | Fuel cell membrane electrode airtightness detection device and system | |
| CN204882292U (en) | Lithium ion battery electrode material heat stability analytical equipment | |
| CN202939048U (en) | G-M refrigerator regenerator performance tester | |
| CN213782216U (en) | Vacuum acid filling system for AGM battery | |
| CN115184824B (en) | System, method and device for measuring residual space in battery | |
| CN104155425A (en) | High-precision PCT test instrument and method for testing PCT of hydrogen storage alloy material | |
| CN105427906A (en) | System and process for releasing and measuring fission gas of heavy-water reactor fuel elements | |
| CN215374942U (en) | Gas production detection device for lithium ion battery | |
| CN211740526U (en) | Air tightness detection device | |
| CN108931280A (en) | A kind of detection device and its detection method of lithium ion battery volume | |
| CN105716682B (en) | Biogas engineering gas production rate test system | |
| CN114965621A (en) | Electrochemical mass spectrum device suitable for solid-state battery gas production research | |
| CN114577847A (en) | Lithium battery charging and discharging heat production measuring method based on isothermal differential calorimetry | |
| CN112993339B (en) | Fuel cell stack capable of measuring differential pressure and temperature and performance evaluation method | |
| CN112345728A (en) | Three-dimensional dilatometer and working method thereof | |
| CN102589795B (en) | Wind pressure sensor | |
| CN112697639A (en) | Component concentration estimation device, estimation method of anode component, and fuel cell system | |
| CN207366386U (en) | A kind of device that shale air content is accurately measured based on pressure differential method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |