CN111665003A - Leakage inspection method and leakage inspection device for battery pack - Google Patents
Leakage inspection method and leakage inspection device for battery pack Download PDFInfo
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- CN111665003A CN111665003A CN202010098175.6A CN202010098175A CN111665003A CN 111665003 A CN111665003 A CN 111665003A CN 202010098175 A CN202010098175 A CN 202010098175A CN 111665003 A CN111665003 A CN 111665003A
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- battery pack
- inspection
- preventing member
- deformation preventing
- gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3263—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a differential pressure detector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a leak inspection method and a leak inspection apparatus, which inspect the airtightness of a battery pack based on a differential pressure leak test, the battery pack including a plurality of single cells and an exterior body that accommodates the plurality of single cells in a sealed state therein and has at least one flexible wide surface, the leak inspection method and the leak inspection apparatus being characterized in that a deformation preventing member is disposed substantially on the entire wide surface of the exterior body, and the differential pressure leak test is performed in a state in which the wide surface is prevented from being deformed when an inspection gas is introduced into both the battery pack and a main chamber that becomes a reference of the differential pressure leak test, the battery pack being communicated with each other.
Description
Technical Field
The present invention relates to a method and an apparatus for inspecting a leak in a battery pack. More particularly, the present invention relates to an inspection method and an inspection apparatus using a differential pressure type leak test.
Background
A high-voltage battery module, in which a plurality of unit cells such as a lithium ion secondary battery and a nickel metal hydride battery are connected in series and which is a unit of one component, is used as a driving power source of a vehicle. In general, such a battery module is housed in a hermetically sealable container and mounted on a vehicle as a hermetically sealed battery pack (also referred to as a battery pack). Further, by using a hermetically sealable container with high rigidity, the battery pack can be mounted on the outside of the vehicle cabin, and a large-capacity battery pack can be used as a driving power source for the vehicle.
Such a battery pack includes an exterior body capable of hermetically accommodating a plurality of electric cells (i.e., a battery module) therein, and an opening of the exterior body is sealed to hermetically seal the interior.
In addition, in the process of manufacturing such a battery pack, a leak test for confirming the hermeticity of the battery pack is performed.
As one of conventional techniques for leak inspection, a so-called probe method is cited. In the probe method, as described in JP2013-89405a, for example, first, a test gas (for example, a mixed gas of hydrogen and nitrogen) for leak test is enclosed in a battery pack. Then, by using the probe of the leak inspection apparatus, the leak portion of the gas leaking from the mating surface (sealing portion) of the battery pack or the like can be specified.
However, in the leak inspection of the battery pack by the probe method, since the inspection gas is sealed after the air in the battery pack is removed before the inspection, the operation is complicated and it is easy to take time. Therefore, a leak inspection method which is simpler and can be performed in a shorter time than the probe method is required.
In many cases, in the leak test, a gas (for example, a test gas) needs to be sealed inside the battery pack. In this case, in a battery pack using an exterior body in which a part of the exterior body (for example, a lid body covering the exterior body main body) is made of a flexible material (various resins, a thin aluminum plate, or the like), the part of the flexible exterior body expands due to the introduction of the inspection gas at the time of leak inspection, and the part may be deformed depending on the case. Depending on the degree of expansion and deformation, reliability of the accuracy of the leak inspection of the battery pack may no longer be ensured, and the flexible portion of the exterior body may be damaged.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems that may occur in the leakage inspection of a battery pack, and an object thereof is to provide a method for inspecting leakage of a battery pack, which is capable of suppressing expansion and deformation of a part of an outer package of a battery pack and breakage thereof associated therewith even when the part of the outer package is made of a material having flexibility, and which is simpler in operation than conventional methods. Another object of the present invention is to provide a leak inspection apparatus used in the leak inspection method.
In a leak test of a battery pack by a differential pressure leak test, the present inventors paid attention to a configuration in which a deformation preventing member is disposed substantially over the entire flexible wide-width outer casing of the battery pack. Further, the present inventors have found that, when an inspection gas is introduced into a battery pack and a main chamber which becomes a reference for a differential pressure leak test, accurate leak inspection can be performed while preventing deformation of the flexible wide surface by the deformation preventing member disposed, and finally completed the present invention.
That is, in order to achieve the above object, the present invention provides a leak inspection method for inspecting airtightness of a battery pack based on a differential pressure leak test, the battery pack including a plurality of unit cells and an exterior body that accommodates the plurality of unit cells in a sealed state therein and has at least one wide width having flexibility.
In the leak inspection method disclosed herein, the deformation preventing member is disposed on substantially the entire wide surface of the exterior body, and the differential pressure leak test is performed in a state in which the deformation preventing member can prevent deformation of the wide surface when the inspection gas is introduced into both the battery pack and the main chamber that becomes a reference of the differential pressure leak test, which are communicated with each other.
In the inspection method having this configuration, by disposing the deformation preventing member on substantially the entire wide surface of the exterior body of the battery pack, even when the wide surface is flexible, deformation of the wide surface can be prevented when the inspection gas is supplied to the battery pack and the main chamber.
In a preferred aspect of the inspection method disclosed herein, the deformation preventing member is a bag-shaped elastic member capable of introducing an inspection gas into the interior thereof and capable of being inflated by the gas pressure of the introduced inspection gas. The differential pressure leak test is performed after supplying an inspection gas to both the deformation preventing member and the battery pack, which are communicated with each other, so that the internal pressure of the deformation preventing member and the internal pressure of the battery pack are in a balanced state.
The deformation preventing member is a member that can introduce the inspection gas into the interior and can expand by the inspection gas, and the internal pressures of the battery pack and the deformation preventing member are balanced, whereby the outer package of the battery pack can be more reliably prevented from being deformed.
The present invention also provides a leak inspection device for inspecting the airtightness of a battery pack based on a differential pressure leak test, the battery pack including a plurality of unit cells and an exterior body that accommodates the plurality of unit cells in a sealed state therein and has at least one wide width that is flexible.
The inspection apparatus disclosed herein includes: a gas supply system that supplies a gas for inspection to both the main chamber that becomes a reference of the differential pressure leak test and the battery pack; and a deformation preventing member disposed substantially on the entire wide surface of the exterior body. The deformation preventing member is disposed on substantially the entire wide surface of the exterior body so as to prevent deformation of the wide surface when the inspection gas is introduced into the battery pack from the gas supply system.
Since the inspection device of this configuration includes the deformation preventing member disposed on substantially the entire wide surface of the outer package of the battery pack, even when the wide surface of the outer package is flexible, deformation of the wide surface can be prevented when the inspection gas is supplied to the battery pack and the main chamber.
In a preferred aspect of the inspection apparatus disclosed herein, the deformation preventing member is a bag-shaped elastic member that can introduce the inspection gas into the interior thereof and can be inflated by the gas pressure of the introduced inspection gas. The gas supply system is configured to communicate the main chamber, the battery pack, and the deformation preventing member with each other, and to supply an inspection gas into the deformation preventing member. The method is characterized in that a differential pressure type leakage test is executed in a state where an inspection gas is supplied to both the deformation preventing member and the battery pack so that the internal pressure of the deformation preventing member and the internal pressure of the battery pack are in a balanced state.
The deformation preventing member is configured to be able to introduce the inspection gas into the interior and to be able to expand by the inspection gas, and the battery pack and the deformation preventing member are configured to communicate with each other, so that the deformation preventing member can be expanded in accordance with the introduction of the inspection gas into the battery pack. Further, the internal pressures of the battery pack and the deformation preventing member are balanced, thereby preventing the outer package of the battery pack from being deformed.
In a particularly preferred aspect of the inspection apparatus having the above configuration, the gas supply system includes a valve capable of adjusting supply of the inspection gas to the deformation preventing member independently of supply of the inspection gas to the battery pack. Further, the differential pressure leak test is performed in a state where the internal pressure of the deformation preventing member is maintained after the internal pressure of the deformation preventing member reaches the equilibrium state, while the valve is closed.
By providing the valve in the gas supply system, the supply of the inspection gas to the deformation preventing member can be adjusted, and thus the valve can be shut off after the equilibrium state is reached, and the internal pressure in the equilibrium state can be maintained. Thus, the differential pressure type leak test can be performed more accurately while preventing deformation of the outer package of the battery pack.
Drawings
Fig. 1 is a schematic diagram showing an inspection apparatus using an inspection method of an embodiment.
Fig. 2A is a schematic view showing a main part of the leak inspection apparatus according to the embodiment, and is a view showing a state before the inspection gas is introduced into the deformation preventing member.
Fig. 2B is a schematic view showing a main part of the leak inspection apparatus according to the embodiment, and is a view showing a state after the inspection gas is introduced into the deformation preventing member.
Fig. 3 is a flow chart schematically illustrating an inspection method of an embodiment.
Detailed Description
Hereinafter, an embodiment of the leak inspection method and the leak inspection apparatus disclosed herein will be described with reference to the drawings. In the drawings described below, members and portions that perform the same function are denoted by the same reference numerals, and redundant descriptions may be omitted or simplified. In addition, the matters required for implementing the present invention, among the matters other than the matters specifically mentioned in the present specification, can be understood as design matters based on the conventional technology in the field by those skilled in the art.
In the present specification, the term "battery pack" refers to a component in which a structure in which a plurality of unit cells are arranged is housed in a sealed container. Here, the term "single cell" refers to a term of each of the storage elements that can be connected to each other to constitute the battery pack, and the storage elements constituting the single cell include batteries (for example, lithium ion secondary batteries) and capacitors (for example, lithium ion capacitors) of various components, unless otherwise specified. In the present specification, the term "differential pressure type leak test" is a term indicating a conventionally known differential pressure type leak test, and is not particularly limited. That is, the term is a general term for a test (test) for evaluating the airtightness of an inspection target based on the difference in internal pressure between a reference main chamber and the inspection target (here, a battery pack).
First, a leak inspection apparatus used in the leak inspection method disclosed herein and a battery pack 10 as an inspection target will be described with reference to fig. 1, 2A, and 2B. Fig. 1 schematically illustrates an inspection apparatus 100 according to an embodiment. Fig. 2A is a schematic view showing a main part of the leak inspection apparatus according to the embodiment, and is a view showing a state before the inspection gas is introduced into the deformation preventing member. Fig. 2B is a schematic view showing a main part of the leak inspection apparatus according to the embodiment, and is a view showing a state after the inspection gas is introduced into the deformation preventing member.
< Battery pack >
A battery pack 10 as an inspection target of the leak inspection method disclosed herein will be described with reference to the drawings. The battery pack 10 includes a plurality of unit cells (not shown, typically several tens to three hundred or so) and an exterior body 16 that houses the plurality of unit cells in a sealed state. The shape of the outer package 16 of the battery pack 10 is not particularly limited, but for example, the following structure can be preferably employed: the opening of the bottomed box-shaped battery can main body 14 having an upper opening is closed by a lid 12 having a wide width 12s and fixed with a sealing material or the like (not shown).
Examples of the material of the lid 12 include a resin molded product and a flexible material such as a thin aluminum plate. Thus, the cover body 12 has at least one wide width 12s having flexibility. As a material of the battery pack main body 14, a material that can be used as such a battery pack main body material can be used without particular limitation. Typically, for example, stainless steel, iron, aluminum, or the like can be cited.
< overall Structure of inspection apparatus >
Next, the overall configuration of the inspection apparatus 100 used in the inspection method disclosed herein will be described in detail with reference to fig. 1.
The inspection apparatus 100 includes a differential pressure type leak tester 30. The differential pressure type leak tester 30 is a device for inspecting the airtightness of the battery pack 10, and is substantially composed of a differential pressure gauge 34, a first valve 33a, a second valve 33b, and a gas supply system 36, and is connected to a supply source 31 of inspection gas and a regulator 32 via the gas supply system 36. In addition, the battery pack 10 and the main chamber 35 communicate with each other via a gas supply system 36.
< pressure regulator >
The regulator 32 is a general pressure regulator for regulating the gas pressure of the inspection gas supplied from the supply source 31. This makes it possible to supply the inspection gas adjusted to a predetermined gas pressure to each part.
< differential pressure gauge >
The differential pressure gauge 34 is a measuring instrument for measuring a differential pressure (differential pressure) between two points, and measures a differential pressure between the battery pack 10 and a main chamber 35 described later. Specifically, the differential pressure gauge 34 includes: a case having airtightness; and a diaphragm 34d that hermetically separates the internal space of the case and divides the internal space into two spaces 341 and 342. When a pressure difference occurs between the two spaces, the diaphragm 34d as a pressure-sensitive element expands toward the space with a smaller pressure in the differential pressure gauge 34. Thus, the differential pressure gauge 34 can detect that a differential pressure has occurred, and can detect the magnitude of the differential pressure that has occurred between the spaces 341 and 342 from the amount of deformation of the diaphragm 34 d.
As shown in the drawing, the space 341 and the main chamber 35 are connected to the connection portion 34a and the connection portion 35a via the gas supply system 36. The space 342 and the battery pack 10 are connected to the connection portion 34b and the connection portion 10b via the gas supply system 36. That is, since both the space 341 and the space 342 are connected to either one of the main chamber 35 and the battery pack 10, a differential pressure therebetween can be detected.
< Main Chamber >
The main chamber 35 is a container with air-tightness ensured, and holds a pressure that is a reference when the differential pressure is measured by the differential pressure gauge 34. As the main chamber 35, various containers having the same internal volume as that of the inspection object (in this case, the battery pack 10) and no gas leakage, such as a dummy workpiece (japanese: pseudo workpiece) for which no leakage is confirmed, can be used.
< gas supply System 36>
The gas supply system 36 is a line for connecting the supply source 31 of the inspection gas (air, nitrogen gas, or the like), the regulator 32, each part of the differential leak tester, the main chamber 35, and the battery pack 10 to be inspected to each other and supplying the inspection gas to both the main chamber 35 and the battery pack 10. The gas supply system 36 is constituted by a member that maintains airtightness.
The gas supply system 36 is provided with a first valve 33a and a second valve 33b, and can switch the supply state (i.e., on and off) of the inspection gas to each part. Specifically, for example, when the first valve 33a is in an open state (on), the inspection gas is supplied to the piping system downstream of the first valve 33a, and therefore, the inspection gas is introduced into both the battery pack 10 and the main chamber 35. On the other hand, when the first valve 33a is in the closed state (off), the inspection gas is not supplied to the piping system downstream of the first valve 33a, and therefore the inspection gas is not introduced into the battery pack 10 and the main chamber 35.
When the second valve 33b is in the open state, the inspection gas can move in the piping system downstream of the second valve 33 b. On the other hand, when the second valve 33b is in the closed state, both the internal pressure of the main chamber 35 and the internal pressure of the battery pack 10, which are the references of the differential pressure leak test, are maintained.
< control device >
The control device 60 controls a series of operations of the differential leak tester 30, and has a configuration including, for example, a computer including a CPU, a ROM, a RAM, an HDD, and the like. The control device 60 controls the supply of the inspection gas from the supply source 31, for example. The opening and closing operations of the first valve 33a, the second valve 33b, and a third valve 33c described later are controlled. Then, the control device 60 determines whether or not the airtightness of the battery pack 10 to be inspected is present based on the differential pressure detected by the differential pressure gauge 34 (specifically, for example, the detection result detected by the diaphragm 34 d).
< deformation preventing Member >
The inspection apparatus 100 used in the inspection method disclosed herein includes the deformation preventing member 20. As shown in the drawing, the deformation preventing member 20 is disposed substantially on the entire wide surface 12s of the exterior body 12 of the battery pack 10. This prevents deformation of the wide width 12s when the inspection gas is introduced from the gas supply system 36 into the battery pack 10 and the main chamber 35.
The deformation preventing member 20 is preferably formed of, for example, a bag-shaped elastic member capable of introducing an inspection gas into the inside and capable of being inflated by the gas pressure of the introduced inspection gas. Specifically, for example, an elastic member made of rubber or an elastic material is preferably used.
When the member having the above-described configuration is used as the deformation preventing member 20, the gas supply system 36 is provided with a branch point X as shown in the drawing. Further, a gas supply system 36X is provided starting from the branch point X. Thus, the inspection gas can be supplied to both the deformation preventing member 20 and the battery pack 10 so that the internal pressure of the deformation preventing member 20 and the internal pressure of the battery pack 10 are in a balanced state. The gas supply system 36x includes a third valve 33c, and the third valve 33c is capable of adjusting the supply of the inspection gas to the deformation preventing member 20 via the connection portion 20c, independently of the supply of the inspection gas to the battery pack 10. That is, when the third valve 33c is in the open state, the inspection gas is introduced into the deformation preventing member 20. On the other hand, when the third valve 33c is in the closed state, the piping system downstream of the third valve 33c is sealed. This can keep the internal pressure of the deformation preventing member 20 and prevent the deformation of the wide width 12s when the inspection gas is introduced into the battery pack. In this state, a differential pressure type leak test described later can be performed.
< inspection method >
Next, the flow of the inspection method disclosed herein will be described in detail with reference to fig. 1, 2A, 2B, and 3. Fig. 3 schematically shows a control flow of an inspection method according to an embodiment.
< connecting Process >
First, the connection step S10 is explained. In the connecting step S10, the battery pack 10 ("workpiece" in fig. 3) to be inspected by the inspection method disclosed herein is connected to the inspection apparatus 100. Specifically, the differential pressure leak tester 30 is connected to the supply source 31 and the regulator 32, and the main chamber 35, the battery pack 10, and the deformation preventing member 20 are connected to the differential pressure leak tester 30.
The battery pack 10 is connected to the differential pressure leak tester 30 by inserting the nozzle 38 provided at the tip of the gas supply system 36 into the connection portion 10b provided in advance in the battery pack 10. The shape of the nozzle 38 at this time corresponds to a shape that can be connected when the nozzle 38 is inserted into the connecting portion 10b, for example. Further, a sealing material or the like may be used as necessary. The airtightness of the battery pack 10 is not lost by connecting the nozzle 38 to the connecting portion 10 b.
Next, the deformation preventing member 20 is disposed on the wide width surface 12 s. When the deformation preventing member 20 is formed of the elastic member as described above, the nozzle 38 provided at the tip of the gas supply system 36x is inserted into the connecting portion 20c provided in advance in the deformation preventing member 20, whereby the deformation preventing member 20 and the differential pressure leak tester 30 are connected. The shape of the nozzle 38 and the connecting portion 20c at this time corresponds to a shape capable of connecting with each other. Further, a sealing material or the like may be used as necessary. The airtightness of the deformation preventing member 20 is not lost by connecting the nozzle 38 with the connecting portion 20 c.
As shown in the drawing, for example, the frame 50 may be disposed on the deformation preventing member 20. In this state, when the deformation preventing member 20 expands due to the internal pressure of the inspection gas, the movement of the deformation preventing member 20 due to the expansion can be restricted, and the positional deviation on the wide surface 12s can be prevented. Moreover, the deformation of the wide width 12s can be suppressed more effectively. Further, a hole 52 is provided in the frame 50 so as to allow the nozzle 38 to penetrate therethrough.
Next, the main chamber 35 is connected to the differential pressure leak tester 30 by inserting a nozzle provided at the tip of the gas supply system 36 into a predetermined connecting portion provided in the main chamber 35. Since the connection of the main chamber 35 to the differential pressure type leak tester 30 is not a feature of the present invention, detailed description is omitted.
< implementation of leak test >
Here, the state of performing the leak test on the battery pack 10 as a workpiece will be described.
In the leak test, first, the first valve 33a, the second valve 33b, and the third valve 33c are opened (opening step S20). Next, a predetermined amount of the inspection gas adjusted to a predetermined pressure (typically, 5kPa to atmospheric pressure) by the regulator 32 is simultaneously supplied from the inspection gas supply source 31 to the entire battery pack 10 and the inspection apparatus 100 via the gas supply system 36 (gas supply step S30). Here, a predetermined amount of gas is supplied to the entire battery pack 10 and the inspection apparatus 100, and it is determined whether or not the internal pressure of the battery pack 10, the internal pressure of the deformation preventing member 20, and the internal pressure of the main chamber 35 are equal, and particularly, whether or not the internal pressure of the deformation preventing member 20 and the internal pressure of the battery pack 10 are in a balanced state (S40). If it is determined that the pressure is equal (i.e., in the equilibrium state) (yes), the next closing step S50 is performed. When it is determined that the pressure is not equal (no), the gas is supplied until the pressure becomes equal (gas supply step S30).
< closure of valve >
In the closing step S50, the first valve 33a and the third valve 33c are closed. This can stop the supply of the inspection gas from the supply source 31, and can isolate the deformation preventing member 20 from the battery pack 10 and the main chamber 35 while maintaining the internal pressure.
Next, it is determined whether or not the internal pressure of the battery pack 10 and the internal pressure of the main chamber 35 are equal (S60). If it is determined to have equal pressure (yes), the next closing step S70 is performed. When it is determined that the pressure is not equal (no), the closing step S70 is not performed until the pressure is equal. That is, after the internal pressure of the deformation preventing member 20 and the internal pressure of the battery pack 10 become balanced, and after the internal pressure of the battery pack 10 and the internal pressure of the main chamber 35 become equal, the differential pressure type leak test is performed.
In the closing step S70, the second valve 33b is closed. This can isolate the battery pack 10 and the main chamber 35 from each other while maintaining the internal pressure.
< evaluation of airtightness >
Next, the airtightness of the battery pack 10 is evaluated (S80).
Since the main chamber 35 has airtightness, no inspection gas leaks out, and the internal pressure of the main chamber 35 does not decrease. In addition, when the battery pack 10 is airtight, the inspection gas from the battery pack 10 does not leak out, and the internal pressure of the battery pack 10 does not decrease. On the other hand, when the battery pack 10 is not airtight, the inspection gas leaks from the battery pack 10, and the internal pressure of the battery pack 10 decreases. In such a case, as described above, a differential pressure is generated between the internal pressure of the space 341 and the internal pressure of the space 342 in the differential pressure gauge 34. This differential pressure can be detected by a diaphragm 34d provided in the differential pressure gauge 34.
Then, the inspection result based on the separator 34d is taken into the control device 60, and the control device 60 calculates the leakage amount of the inspection gas and the like, and evaluates the airtightness of the battery pack 10 by a differential pressure type leakage test (S80). That is, when a differential pressure is generated between the battery pack 10 and the main chamber 35, the battery pack 10 is determined to be airtight. On the other hand, when a differential pressure is not generated between the battery pack 10 and the main chamber 35, it is determined that the battery pack 10 is not airtight.
Further, from the past, the following are known: as long as the temperature change in the battery pack 10 and the main chamber 35 is the same, the influence on the inspection result by the temperature change in the differential pressure leak test can be disregarded.
The leakage inspection of the battery pack 10 is performed using the inspection method and the inspection apparatus disclosed herein.
According to the above configuration, when the inspection gas is introduced into the battery pack 10 and the main chamber 35, the deformation preventing member 20 expands. Thus, the pressure P2 is applied uniformly to the substantially entire wide surface 12s by the expansion (see fig. 2A and 2B). At this time, in the battery pack 10 into which the inspection gas is introduced, a pressure P1 is generated, and thus a pressure P1 is applied to the deformation preventing member 20 via the lid 12. When the internal pressure of the battery pack 10 and the internal pressure of the deformation preventing member 20 are in a balanced state, the pressure P1 is equal to the pressure P2, and therefore, deformation of the wide portion 12s can be suppressed. This ensures the reliability of the accuracy of the leak inspection of the battery pack. Further, by using the differential pressure type leak test for the leak inspection of the battery pack, the step of removing air from the battery pack, which is required in the conventional method, can be omitted, and a leak inspection method simpler than the conventional method can be provided.
The present invention has been described in detail above, but the above embodiments are merely examples, and the invention disclosed herein includes various modifications and alterations to the specific examples.
For example, a metal material may be used as the deformation preventing member 20. In this case, a physical force such as a spring is used to apply a uniform pressure to the deformation preventing member 20 and to substantially the entire wide surface 12 s. In this case, the same effects as described above can be obtained in the present invention.
Cross Reference to Related Applications
The application claims priority based on japanese patent application No. 2019-042398, filed on 3/8/2019, the entire contents of which are incorporated by reference into the present specification.
Claims (5)
1. A leak inspection method for inspecting the airtightness of a battery pack including a plurality of unit cells and an exterior body that accommodates the unit cells in a sealed state and has at least one wide width with flexibility, based on a differential pressure leak test,
the deformation preventing member is disposed substantially over the entire wide surface of the exterior body, and the differential pressure leak test is performed in a state in which the deformation of the wide surface can be prevented when the inspection gas is introduced into both the battery pack and the main chamber, which are the references of the differential pressure leak test, which are communicated with each other.
2. The leak inspection method according to claim 1,
the deformation preventing member is composed of a bag-shaped elastic member which can introduce the inspection gas into the interior and can be expanded by the pressure of the introduced inspection gas,
the differential pressure type leak test is performed after supplying an inspection gas to both the deformation preventing member and the battery pack, which are communicated with each other, so that the internal pressure of the deformation preventing member and the internal pressure of the battery pack are in a balanced state.
3. A leak inspection device for inspecting the airtightness of a battery pack including a plurality of unit cells and an exterior body which accommodates the unit cells in a sealed state and has at least one wide width having flexibility, on the basis of a differential pressure leak test,
the leakage inspection device includes:
a gas supply system that supplies a gas for inspection to both the main chamber and the battery pack that are the reference of a differential pressure leak test; and
a deformation preventing member disposed substantially over the entire wide surface of the exterior body,
the deformation preventing member is disposed substantially over the entire wide surface of the exterior body so as to prevent deformation of the wide surface when the inspection gas is introduced into the battery pack from the gas supply system.
4. The leak inspection device according to claim 3,
the deformation preventing member is composed of a bag-shaped elastic member which can introduce the inspection gas into the interior and can be expanded by the pressure of the introduced inspection gas,
the gas supply system is configured to communicate the main chamber, the battery pack, and the deformation preventing member with each other, and to supply an inspection gas into the deformation preventing member,
after supplying an inspection gas to both the deformation preventing member and the battery pack so that the internal pressure of the deformation preventing member and the internal pressure of the battery pack are in a balanced state, a differential pressure type leak test is performed.
5. The leak inspection device according to claim 4,
the gas supply system includes a valve capable of adjusting the supply of the inspection gas to the deformation preventing member independently of the supply of the inspection gas to the battery pack,
the differential pressure type leak test is performed in a state where the valve is brought into a closed state and the internal pressure of the deformation preventing member is maintained after the internal pressure of the deformation preventing member becomes the equilibrium state.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-042398 | 2019-03-08 | ||
| JP2019042398A JP7165303B2 (en) | 2019-03-08 | 2019-03-08 | Battery pack leak inspection method and leak inspection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111665003A true CN111665003A (en) | 2020-09-15 |
| CN111665003B CN111665003B (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010098175.6A Active CN111665003B (en) | 2019-03-08 | 2020-02-18 | Leakage inspection method and leakage inspection device for battery pack |
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| Country | Link |
|---|---|
| JP (1) | JP7165303B2 (en) |
| CN (1) | CN111665003B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088311A (en) * | 2021-11-03 | 2022-02-25 | 格林美(武汉)动力电池回收有限公司 | Method, system, equipment and storage medium for detecting box security |
| CN113964353B (en) * | 2021-11-30 | 2022-09-02 | 合肥召洋电子科技有限公司 | Air tightness detection mechanism on production line of battery pack shell |
| CN116929667A (en) * | 2023-09-14 | 2023-10-24 | 扬州雄鸡电池有限公司 | Bidirectional nondestructive air tightness detection device and method for battery pack |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07103845A (en) * | 1993-10-07 | 1995-04-21 | Yamaha Corp | Method and equipment for leak test |
| JP2005108481A (en) * | 2003-09-29 | 2005-04-21 | Shin Kobe Electric Mach Co Ltd | Battery pack |
| JP2006202560A (en) * | 2005-01-19 | 2006-08-03 | Toyota Motor Corp | Method of manufacturing sealed battery, and airtight inspection device |
| CN1851432A (en) * | 2006-03-24 | 2006-10-25 | 江苏宝胜电气股份有限公司 | Inflation cell evacuation helium test and insulated medium filling technical method |
| CN101738295A (en) * | 2008-11-12 | 2010-06-16 | 雅马哈精密科技株式会社 | Leak inspection apparatus |
| CN104040317A (en) * | 2011-11-16 | 2014-09-10 | 英福康有限责任公司 | Quick leak detection on dimensionally stable/slack packaging without the addition of test gas |
| CN104718442A (en) * | 2012-10-01 | 2015-06-17 | 英福康有限责任公司 | Film chamber and method for leak detection on a non-rigid specimen |
| CN104849403A (en) * | 2015-04-22 | 2015-08-19 | 宁德时代新能源科技有限公司 | Method for monitoring lithium ion battery expansion |
| CN106441744A (en) * | 2016-12-13 | 2017-02-22 | 力信（江苏）能源科技有限责任公司 | Leakage checking device of lithium ion square power battery and leakage checking process of leakage checking device |
| CN108534963A (en) * | 2018-03-16 | 2018-09-14 | 昆山丘钛微电子科技有限公司 | A kind of water proofing property detection method and system |
| CN108700485A (en) * | 2015-12-14 | 2018-10-23 | 日本福田株式会社 | Leak inspection device and method |
| CN108731888A (en) * | 2018-03-14 | 2018-11-02 | 中航锂电（洛阳）有限公司 | A kind of battery pack IP67 protection reliability test system |
| CN108780856A (en) * | 2016-03-10 | 2018-11-09 | 日产自动车株式会社 | Battery pack |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3430977B2 (en) * | 1999-07-15 | 2003-07-28 | ヤマハ株式会社 | Leak test method and leak test device |
| JP2006329650A (en) * | 2005-05-23 | 2006-12-07 | Shimadzu System Solutions Co Ltd | Packing leakage inspection device |
| FR2980306B1 (en) * | 2011-09-15 | 2013-10-11 | Commissariat Energie Atomique | METHOD FOR TESTING THE SEALING OF A BIPOLAR STRUCTURE FOR AN ELECTROCHEMICAL GENERATOR |
-
2019
- 2019-03-08 JP JP2019042398A patent/JP7165303B2/en active Active
-
2020
- 2020-02-18 CN CN202010098175.6A patent/CN111665003B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07103845A (en) * | 1993-10-07 | 1995-04-21 | Yamaha Corp | Method and equipment for leak test |
| JP2005108481A (en) * | 2003-09-29 | 2005-04-21 | Shin Kobe Electric Mach Co Ltd | Battery pack |
| JP2006202560A (en) * | 2005-01-19 | 2006-08-03 | Toyota Motor Corp | Method of manufacturing sealed battery, and airtight inspection device |
| CN1851432A (en) * | 2006-03-24 | 2006-10-25 | 江苏宝胜电气股份有限公司 | Inflation cell evacuation helium test and insulated medium filling technical method |
| CN101738295A (en) * | 2008-11-12 | 2010-06-16 | 雅马哈精密科技株式会社 | Leak inspection apparatus |
| CN104040317A (en) * | 2011-11-16 | 2014-09-10 | 英福康有限责任公司 | Quick leak detection on dimensionally stable/slack packaging without the addition of test gas |
| CN104718442A (en) * | 2012-10-01 | 2015-06-17 | 英福康有限责任公司 | Film chamber and method for leak detection on a non-rigid specimen |
| CN104849403A (en) * | 2015-04-22 | 2015-08-19 | 宁德时代新能源科技有限公司 | Method for monitoring lithium ion battery expansion |
| CN108700485A (en) * | 2015-12-14 | 2018-10-23 | 日本福田株式会社 | Leak inspection device and method |
| CN108780856A (en) * | 2016-03-10 | 2018-11-09 | 日产自动车株式会社 | Battery pack |
| CN106441744A (en) * | 2016-12-13 | 2017-02-22 | 力信（江苏）能源科技有限责任公司 | Leakage checking device of lithium ion square power battery and leakage checking process of leakage checking device |
| CN108731888A (en) * | 2018-03-14 | 2018-11-02 | 中航锂电（洛阳）有限公司 | A kind of battery pack IP67 protection reliability test system |
| CN108534963A (en) * | 2018-03-16 | 2018-09-14 | 昆山丘钛微电子科技有限公司 | A kind of water proofing property detection method and system |
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|---|---|
| CN111665003B (en) | 2022-09-23 |
| JP2020144064A (en) | 2020-09-10 |
| JP7165303B2 (en) | 2022-11-04 |
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