WO2019164300A1

WO2019164300A1 - Method for measuring insulation resistance of rechargeable battery cell

Info

Publication number: WO2019164300A1
Application number: PCT/KR2019/002135
Authority: WO
Inventors: 윤진국; 이유성; 박명철
Original assignee: 주식회사 이티에스
Priority date: 2018-02-21
Filing date: 2019-02-21
Publication date: 2019-08-29
Also published as: KR20190100737A; KR102468740B1

Abstract

The present invention relates to a method for measuring the insulation resistance of a rechargeable battery cell, and more specifically, to a method for measuring the insulation resistance of a rechargeable battery cell, whereby the insulation resistance of a pouch-type rechargeable battery cell is measured in order to sort out good-quality pouch-type rechargeable battery cells. Disclosed is a method for measuring the insulation resistance of a rechargeable battery cell (40), the rechargeable battery cell (40) comprising: an electrode assembly (10) having first electrode sheets (12) and second electrode sheets (14) alternately laminated, and having separators (16) respectively positioned between the first electrode sheets (12) and the second electrode sheets (14); a pouch (20) for sealing the electrode assembly (10); and a lead tab (30) connected to the electrode assembly (10) and protruding to the outside of the pouch (20).

Description

Insulation resistance measurement method of secondary battery cell

The present invention relates to a method for measuring insulation resistance of a secondary battery cell, and more particularly, to a method for measuring insulation resistance of a secondary battery cell for measuring insulation resistance of a pouch-type secondary battery cell in order to select a good quality pouch type secondary battery cell. It is about.

In general, a chemical cell is composed of a pair of electrodes of a positive electrode and a negative electrode and an electrolyte, and the amount of energy that can be stored varies depending on the material of the electrode and the electrolyte.

These chemical cells are classified into a primary battery used only for one-time discharge because of a very slow charging reaction, and a secondary battery that can be reused through repeated charging and discharging.

Secondary batteries are applied to various technical fields throughout the industry. For example, secondary batteries are used as energy sources for advanced electronic devices such as wireless mobile devices, and air pollution of existing gasoline and diesel internal combustion engines using fossil fuels. It is also attracting attention as an energy source for hybrid electric vehicles, which is being proposed as a solution for this.

Secondary batteries are manufactured in various ways depending on the shape of the case housing the electrode assembly, and typical shapes include cylindrical, rectangular, and pouch types.

In general, the cylindrical secondary battery uses a cylindrical aluminum can, the rectangular secondary battery uses a rectangular aluminum can, and the pouch type secondary battery is sealed with a pouch in which a thin aluminum laminate film made of aluminum is used as a pack. It is relatively light in weight and excellent in stability and is widely used in recent years.

As an example, a configuration of a pouch-type secondary battery cell includes a stack, which is an electrode assembly formed by interposing a separator, a separator between a negative electrode and a positive electrode, and an aluminum-laminated film by sealingly accommodating the stack therein. Pouch consisting of one end is connected to the stack and the other end is exposed to the outside of the pouch consists of a plate-shaped negative electrode lead tab for inducing current to the outside.

The secondary battery cell is generally completed by injecting an electrolyte into a pouch containing an electrode assembly composed of a negative electrode, a positive electrode, and a separator interposed therebetween, and then sealing it.

On the other hand, in the pouch consisting of a nylon layer, an aluminum layer and a P.P layer (Poly propylene) forming the inner surface of the pouch, when the scratch or stamp occurs in the P.P layer, the electrode assembly and the pouch may be shorted in the corresponding portion.

In addition, when the lead film provided between the sealing area of the pouch and the lead tab to prevent the flow of current between the pouch and the lead tab is damaged or defective, the lead tab and the pouch may be shorted in the corresponding portion.

In the case of a normal secondary battery cell, the electrode assembly and the pouch are electrically insulated, thereby achieving stable charging and discharging without explosion or carbonization of the secondary battery cell, but the secondary battery cell in which the electrode assembly and the pouch or the lead tab and the pouch are shorted is shorted. As the current flows to the broken part, it is difficult to operate the safe and stable secondary battery cell, so it is necessary to be selected as a defective product.

An object of the present invention, by recognizing the necessity as described above, can prevent the secondary battery cell, not a good product is wrongly selected as a secondary battery cell of the good, in advance, it is possible to improve the reliability of the insulation resistance measurement of the secondary battery cell The present invention provides a method for measuring insulation resistance of a secondary battery cell.

The present invention was created to achieve the object of the present invention as described above, the first electrode sheet 12 and the second electrode sheet 14 are alternately stacked with each other and the first electrode sheet 12 and the second The electrode assembly 10 having the separator 16 positioned between the electrode sheets 14, the pouch 20 for sealing the electrode assembly 10, and the pouch 20 connected to the electrode assembly 10. An insulation resistance measuring method for a secondary battery cell 40 including a lead tab 30 protruding to the outside thereof is disclosed.

The insulation resistance measuring method includes: a pouch conduction test step of testing whether a current flows through the pouch 20 by applying a voltage between at least two first measurement points of the pouch 20; A lead tap energization test step of testing whether a current flows through the lead tab 30 by applying a voltage between at least two second measurement points of the lead tab 30; After the pouch energization test step and the lead tap energization test step, an input voltage is applied between at least one of the first measurement point and the at least one second measurement point, thereby providing the pouch 20 and the lead tap 30. It may include an insulation resistance measuring step of measuring the insulation resistance therebetween.

The insulation resistance measuring method may further include a contact terminal adhesion step of closely contacting the pouch connection terminal unit 130 for applying voltage to the at least two second measurement points before the pouch conduction test step.

In the insulation resistance measuring method, when the current does not flow through the pouch 20 in the pouch conduction test step, the connection terminal part contact step and the pouch conduction test step may be performed again.

The insulation resistance measuring method may further include a contact terminal contact step of closely contacting the lead tap connection terminal unit 140 for voltage application to the at least two second measurement points before the lead tap energization test step.

In the insulation resistance measuring method, when the current does not flow through the lead tab 30 in the lead tap energization test step, the contact terminal part contact step and the lead tap energization test step may be performed again.

The lead tap energization test step may be performed when a current flows through the pouch 20 in the pouch energization test step.

The insulation resistance measuring step may be performed when a current flows through the pouch 20 and the lead tab 30 in the pouch energization test step and the lead tap energization test step.

The insulation resistance measuring method may further include a voltage control step of controlling magnitudes of input voltages applied to the first and second measurement points.

The voltage control step may ground the first measurement point after the pouch conduction test step and before the lead tap energization test step.

In the voltage control step, the second measurement point may be grounded after the lead tap energization test step and before the insulation resistance measurement step.

In the voltage control step, in the pouch energization test step, the second measurement point may be grounded.

The insulation resistance measuring step may include measuring at least one of a voltage value, a current value, and a resistance value measured between the first measurement point and the second measurement point as a measurement value, and based on the measurement value. It may include a quality selection step of determining whether or not the secondary battery cell 40 is a good quality.

In the measuring step, a resistance value measured between the first measurement point and the second measurement point may be measured as a measurement value.

In this case, in the selection process, when the resistance value is greater than or equal to a preset reference resistance value, the pouch 20 and the lead tab 30 are determined to be insulated from each other, and the corresponding secondary battery cell 40 is good. Can be determined.

Insulation resistance measuring method of a secondary battery cell according to the present invention, the terminal portion for applying voltage by checking whether the pouch is energized and whether the lead tab is energized before measuring the insulation resistance between the pouch and the lead tab of the secondary battery cell Due to poor contact between the secondary battery cells and defective insulation resistance measurement window (internal disconnection, etc.), it is possible to prevent the secondary battery, which should be selected as a defective product, from being judged as a good product in advance. This has the advantage of greatly improving the reliability of the measurement.

1 is a plan view showing a secondary battery cell in which insulation resistance is measured in the insulation resistance measuring apparatus of the present invention.

FIG. 2 is a sectional view taken along the II-II direction of the secondary battery cell of FIG. 1.

3 is a perspective view showing an insulation resistance measuring apparatus according to an embodiment of the present invention.

4 is a plan view X-Z showing the insulation resistance measuring apparatus of FIG.

FIG. 5 is a plan view X-Y showing the insulation resistance measuring apparatus of FIG. 3.

6 is a plan view Y-Z showing the cell support of the insulation resistance measuring apparatus of FIG.

FIG. 7 is a plan view Y-Z illustrating the aligning and connecting terminal portions of the insulation resistance measuring apparatus of FIG. 3.

8 is a perspective view illustrating the aligning unit of FIG. 7.

FIG. 9 is an X-Y plan view illustrating a lead tab connection terminal part among the connection terminal parts of FIG. 7.

FIG. 10 is a perspective view illustrating a cell alignment unit of the insulation resistance measuring apparatus of FIG. 3.

FIG. 11 is a view illustrating a pouch connection terminal part among the connection terminal parts of FIG. 3.

12A to 12B are conceptual views illustrating a state in which a pouch connection terminal unit and a lead tab connection terminal unit are in contact with a secondary battery cell.

13A to 13C are conceptual views illustrating a circuit diagram constituting an insulation resistance measurement unit for performing insulation resistance measurement of a secondary battery cell and an operation of the insulation resistance measurement unit.

14 is a flowchart illustrating a secondary battery insulation resistance measuring method according to the present invention.

Hereinafter, an insulation resistance measuring apparatus of a secondary battery cell and an insulation resistance measuring system including the same according to the present invention will be described with reference to the accompanying drawings.

In the insulation resistance measuring system according to the present invention, the first electrode sheet 12 and the second electrode sheet 14 are alternately stacked with each other, and a separation film between the first electrode sheet 12 and the second electrode sheet 14 is formed. 16 includes an electrode assembly 10 in which the electrode assembly 10 is located, a pouch 20 for sealing the electrode assembly 10, and a lead tab 30 connected to the electrode assembly 10 and protruding out of the pouch 20. An insulation resistance measuring apparatus (100) for the secondary battery cell (40) having a plate-like structure composed of a pair of plate surfaces and a plurality of side surfaces; A loading unit for loading the secondary battery cell 40 into the insulation resistance measuring apparatus 100; It includes an unloading unit for unloading the secondary battery cell 40, the insulation resistance measurement is completed in the insulation resistance measuring apparatus 100.

The insulation resistance measuring apparatus 100 measures the insulation resistance of the secondary battery cell 40 in order to check whether the secondary battery cell 40 having a plate-shaped structure composed of a pair of plate surfaces and a plurality of side surfaces is sufficiently insulated. It is a device to measure.

Here, in the secondary battery cell 40 measured by the insulation resistance measuring apparatus according to the present invention, as shown in FIGS. 1 and 2, the first electrode sheet 12 and the second electrode sheet 14 alternate with each other. Alternately stacked and the electrode assembly 10 having the separator 16 positioned between the first electrode sheet 12 and the second electrode sheet 14, a pouch 20 for sealing the electrode assembly 10, The lead tab 30 is connected to the electrode assembly 10 and protrudes out of the pouch 20. Here, FIG. 1 is a plan view of the quadrangular plate-shaped secondary battery cell 40 as viewed in the normal direction perpendicular to the plate surface.

The first electrode sheet 12 and the second electrode sheet 14 are stacked alternately with each other and are separated by the separator 16 therebetween, and form positive and negative electrodes of the secondary battery cell 40, respectively. The member may be formed of a metal sheet according to electrode characteristics.

Electrode tabs (not shown) extend from each electrode sheet in the first electrode sheet 12 and the second electrode sheet 14.

The separator 16 is a member interposed between the first electrode sheet 12 and the second electrode sheet 14, and preferably has a material having high wettability to the electrolyte and high chemical resistance.

The separator 16 may have various materials according to materials of the first electrode sheet 12 and the second electrode sheet 14 constituting the secondary battery cell 40, physical properties of the electrolyte, and the like.

The pouch 20 may be a member for sealing the electrode assembly 10 impregnated with the electrolyte and may have various materials according to the materials of the first electrode sheet 12 and the second electrode sheet 14, the properties of the electrolyte, and the like. .

For example, the pouch 20 may be formed by laminating a nylon layer on one surface of the aluminum layer and a P.P layer on the other surface.

The lead tab 30 includes a pair of positive and negative electrodes, one end of which is connected to the electrode assembly 10 and the other end of which protrudes out of the pouch 20.

The lead tab 30 may be electrically connected to the plurality of electrode tabs extending from the

electrode sheets

12 and 14 by welding.

In addition, at least a portion of the upper and lower surfaces of the lead tab 30 may be attached with a lead film 31 for increasing the sealing degree with the pouch 20 and at the same time ensuring an electrical insulation state.

In the insulation resistance measuring apparatus according to the present invention, as shown in Figures 1 to 11, the cell support portion for supporting one or more secondary battery cells 40 so that the normal of the plate surface of the secondary battery cell 40 is parallel to the horizontal plane 110; In order to measure the insulation resistance of the secondary battery cell 40, a plurality of connection terminal parts electrically connected to the secondary battery cell 40 are included.

The cell support 110 may be configured in various ways to support one or more secondary battery cells 40 such that the normal of the plate surface of the secondary battery cell 40 is parallel to the horizontal plane.

For example, as shown in FIGS. 3 to 6, the cell support 110 includes a lower portion of the secondary battery cell 40 inserted therein to support the electrode assembly 10 sealed inside the pouch 20. It includes a plurality of plate support members 114 for supporting a pair of plate surfaces of the secondary battery cell 40 inserted into the lower support bracket 112 with the support bracket 112 and the lower support bracket 112 therebetween. can do.

The lower support bracket 112 may have a U-shaped cross section, and a groove into which the lower side surface of the secondary battery cell 40 may be inserted may be formed along the longitudinal direction of the lower side surface.

In addition, the width of the groove is preferably formed smaller than the width of the electrode assembly 10 sealed in the pouch 20 as shown in FIG.

Since the width of the groove is smaller than the width of the electrode assembly 10, the electrode assembly 10 sealed inside the pouch 20 may be supported on the upper surface of the lower support bracket 112.

The plurality of plate support members 114 may be configured to support a pair of plate surfaces of the secondary battery cell 40 inserted into the lower support bracket 112 with the lower support bracket 112 interposed therebetween. Do.

For example, as shown in FIGS. 3 and 4, the plurality of plate support members 114 are vertically supported longitudinal rods, and the lower support brackets 112 are disposed with the lower support brackets 112 therebetween. It can be disposed along both sides of the).

Meanwhile, although not illustrated, the plate support member 114 may be configured in a plate shape opposite to the plate surface of the secondary battery cell 40, which is not a support rod form.

In addition, as illustrated in FIG. 6, the plurality of plate support members 114 may be bent at an upper end thereof to facilitate insertion of the secondary battery cell 40 into the lower support bracket 112. However, the plurality of plate support members 114 may be bent outward at the lower end to facilitate the installation of the plate support members 114.

In this case, the insulation resistance measuring apparatus 100 may further include a cell detecting unit 190 installed in the cell support unit 110 to detect the presence of the secondary battery cell 40.

The cell detecting unit 190 may be configured to detect whether or not the secondary battery cell 40 exists in the cell support unit 110. Various sensor systems may be applied.

For example, the cell detecting unit 190 may be a non-contact optical sensor installed in the lower support bracket 112 or the plate support member 114.

In this case, the cell detecting unit 190 is an optical sensor that receives light directed in a normal direction perpendicular to the plate surface of the secondary battery cell 40, and the secondary battery cell 40 is present in the cell support unit 110. By detecting that light is blocked, it is possible to detect the presence of the secondary battery cell 40.

3 to 6 illustrate an example in which the cell detecting unit 190 is configured as a non-contact optical sensor, a touch sensor (eg, detecting the secondary battery cell 40 based on contact with the secondary battery cell 40). Of course, it can be configured as a load cell).

In addition, the insulation resistance measuring apparatus 100 may further include a cell alignment unit 120 for pressing the side surface of the secondary battery cell 40 to align the secondary battery cell 40.

The cell alignment unit 120 may be configured in a variety of configurations by aligning the secondary battery cell 40 by pressing the side surface of the secondary battery cell 40.

For example, the cell alignment part 120 is installed to face each other in parallel with each other with the cell support part 110 interposed therebetween, and includes at least one pressing member 121 for pressing the side surface of the secondary battery cell 40. A pair of

alignment body parts

122 and 124; The alignment

main body parts

122 and 124 may include a linear moving part which moves relative linearly in a direction away from or close to each other.

The pair of

alignment body parts

122 and 124 are installed to face each other in parallel with each other with the cell support part 110 therebetween, as shown in FIGS. 3 to 5, and are perpendicular to the horizontal plane. It is preferable to install in a state.

The pressing member 121 is configured to press the side surface of the secondary battery cell 40 supported by the cell support unit 110 can be various configurations.

The pressing member 121 is installed on the opposing surfaces of the pair of

alignment body parts

122 and 124, and may be installed at various positions if formed on the contact surface of the secondary battery cell 40. It may be configured as.

For example, as shown in FIG. 8, the pressing member 121 is a plate having a contact surface with the secondary battery cell 40, and is fixed to the lower side of the

alignment body parts

122 and 124. Can be.

As another example, the pressing member 121 is a plate having a contact surface with the secondary battery cell 40, as shown in FIG. 10, and tests the secondary battery cells 40 having various specifications. In order to perform, the alignment

main body

122 and 124 may be installed to be movable along the longitudinal direction of the alignment

main body

122 and 124.

On the other hand, the insulation resistance measuring apparatus according to the present invention, in order to perform the insulation resistance measurement for a plurality of secondary battery cells 40 at a time, may be provided with a plurality of

alignment body parts

122, 124. For example, the insulation resistance measuring apparatus may include two pairs of

alignment body parts

122 and 124, as shown in FIGS. 3 to 6.

In this case, the insulation resistance measuring apparatus is configured to include a plurality of cell support parts 110 correspondingly. In addition, the plurality of

alignment body parts

122 and 124 and the plurality of cell support parts 110 are supported by the cell support parts 110 to make it easier to simultaneously perform insulation resistance measurement while minimizing the size of the device. It is preferable to be disposed along the normal direction perpendicular to the plate surface of the secondary battery cell 40.

The linear moving unit may be configured in a variety of configurations in which the pair of

alignment body portions

122 and 124 move relative to each other in a direction away from or closer to each other.

For example, the linear moving unit may be configured as an actuator driven by pneumatic or hydraulic pressure, but is not limited thereto.

The

alignment body parts

122 and 124 may be linearly moved along the linear movement guide 123 coupled to the lower side of the

alignment body parts

122 and 124 by the linear moving part. The linear movement guide 123 is a path guide formed in a direction perpendicular to the plate surface of the secondary battery cell 40 supported by the cell support part 40.

When the insulation resistance measuring apparatus includes a plurality of pairs of

alignment body parts

122 and 124, the

alignment body parts

122 and 124 disposed on the same side with respect to the cell support part 110 are connected to each other through a coupling member. It is preferable to be configured to be linearly coupled by one linear moving unit.

The plurality of connection terminal parts are installed on at least one of the cell support part 110 and the cell alignment part 120 to be electrically connected to the secondary battery cell 40, and to input an insulation resistance of the secondary battery cell 40. Various configurations are possible with the configuration in which the voltage is applied.

The plurality of connection terminal parts may be made of a conductive material and provided with connection parts electrically connected to the secondary battery cell 40, and may have various shapes and materials and may be installed at various positions.

For example, at least one of the plurality of connection terminal units may be installed in the cell alignment unit 120.

When two connection terminals are electrically connected to two measurement points of the secondary battery cell 40, a specific input voltage may be applied between the two measurement points.

For example, the plurality of connection terminal units may include at least one pouch connection terminal unit 130 that is electrically connected to the pouch 20, particularly the side surface of the pouch 20.

The pouch connection terminal unit 130 may be electrically connected to the pouch 20 by contacting the laminated aluminum layer exposed on the side surface (breaking surface) of the pouch 20.

The pouch connection terminal unit 130 may be installed at various positions as long as it can be connected to the side of the pouch 20. For example, the pouch connection terminal 130 may be installed between the upper surface of the alignment

main body

122, 124 or the structure 1 and the lower side of the secondary battery cell 40.

When the pouch connection terminal unit 130 is installed in the alignment

main body parts

122 and 124, the alignment

main body parts

122 and 124 may be connected to the insulation

main body parts

122 and 124 to measure insulation resistance of the secondary battery cells 40 having various specifications. It is preferable that the shangdong be installed along the guide path.

In addition, the pouch connection terminal 130 is preferably provided with a plurality of at least two or more. For example, as shown in Figures 3 to 5, the present invention is provided with two pouch connecting terminal 130 spaced up and down spaced on the alignment body portion 122 on one side, and the pouch 20 is installed on the lower side A total of four pouch connection terminals 130 may be included, including two pouch connection terminals 130 contacting the lower side of the panel.

Some of the plurality of pouch connection terminals 130 may not be used depending on the size of the secondary battery cell 40 to be measured, and prepare for the maintenance of consumables (for example, the conducting member 132) in the future. Of course, the spare function can be performed.

However, the present invention preferably includes at least two pouch connection terminal units 130 for the secondary battery cell insulation resistance measuring method to be described later.

Specifically, the pouch connection terminal 130 is a current-carrying member 132 which is electrically connected to the side of the pouch 20 of the secondary battery cell 40, and the current-carrying member mounting portion is fixed to the current-carrying member 132 is mounted. 134 and one end may be fixed and the other end may include an elastic member 136 coupled to the energizing member mounting part 134.

The conductive member 132 is made of an electrically conductive material and is electrically connected to the side surface of the pouch 20. Various materials and shapes are possible.

The conducting member 132 may be made of various materials as long as it is an electrically conductive material. However, since the pouch 20 is a thin film, it is easy to cause deformation of the edge-sealed side portion when an external force is applied, and thus has a conductive rubber having elasticity. Energized rubber).

The conducting member 132 may be electrically connected to an external power line, a voltage supply line, a ground line, or the like through a cable (not shown).

As illustrated in FIG. 12A, the conductive member 132 may be in contact with an end surface (breaking surface) of the pouch 20 exposed on the side surface of the secondary battery cell 40.

The conductive member mounting part 134 has a configuration in which the conductive member 132 is fixedly mounted to support the conductive member 132, and thus may have various shapes and materials.

The elastic member 136, one end is fixedly installed, the other end is coupled to the conductive member mounting portion 134 is configured to enable a variety of configurations to enable the elastic position displacement of the conductive member mounting portion 134. The elastic member 136 is illustrated as a coil spring in the drawings, but is not limited thereto.

Specifically, FIG. 8 illustrates the pouch connection terminal 130 installed in the alignment main body 122. In this case, the pouch connection terminal 130 may further include a coupling member 138 for coupling the energization member mounting portion 134 to the alignment main body 122.

At this time, the pouch connecting terminal 130 may be in close contact with the side surface of the pouch 20 by the linear movement of the alignment main body 122 in the X-axis direction. Since the pouch connection terminal 130 may be elastically displaced by the elastic member 136 in the process of closely contacting the pouch connection terminal 130, the pouch 20 and the pouch connection terminal 130 may be used despite the linear movement of the alignment main body 122. Poor contact phenomena without contact between them can be minimized.

6 illustrates a pouch connecting terminal 130 in contact with the lower side of the pouch 20. At this time, the pouch connection terminal 130 may further include a coupling member 138 for coupling the conductive member mounting portion 134 to the structure (1).

Meanwhile, the plurality of connection terminal parts may include at least one lead tab connection terminal part 140 electrically connected to the lead tab 30.

The lead tab connection terminal 140 may be in contact with the lead tab 30 protruding outside the pouch 20 to be electrically connected to the lead tab 30.

The lead tab connection terminal unit 140 may be installed at various positions as long as it can be connected to the lead tab 30. For example, the lead tab connection terminal unit 140 may be installed on one of the pair of

alignment body units

122 and 124 so as to be linearly moved along the length direction of the

alignment body units

122 and 124. .

That is, the lead tab connection terminal 140 may be installed on the alignment

main bodies

122 and 124 through the coupling member 149, as shown in FIG. 7. At this time, the coupling member 149 of the lead tab connection terminal unit 140, the alignment body to enable the insulation resistance measurement for the secondary battery cell 40 of various standards or the energization test for the other lead tab 30, It is preferable to be installed so as to be movable along the guide path formed in the portions (122, 124). Meanwhile, FIG. 7 illustrates a case in which one lead tab connection terminal unit 140 is installed to correspond to one cell support unit 100, but a plurality of lead tab connection terminal units 140 are installed in one cell support unit 100. Of course it is possible.

Specifically, the lead tab connection terminal unit 140 is coupled to a pair of gripping portions 141 holding the lead tab 30 and a pair of gripping portions 141 to provide a pair of gripping portions 141. It may include a gap controller 146 for adjusting the interval between.

As illustrated in FIG. 7, the pair of gripping portions 141 may be disposed to face each other in the horizontal direction to grip both sides of the lead tab 30.

One or more lead tab connection terminals 142a and 142b of an electrically conductive material electrically connected to the lead tab 30 may be provided at a contact surface of the pair of holding portions 141 with the lead tab 30.

For example, one of the pair of holding portions 141 has one or more lead tab connection terminals 142a and 142b electrically connected to the lead tab 30 on a contact surface with the lead tab 30. can do.

However, the present invention preferably includes at least one pair of lead tab connection terminals 142a and 142b for the secondary battery cell insulation resistance measuring method described later.

The pair of lead tab connection terminals 142a and 142b are in contact with different measurement points of the lead tab 30, respectively.

The gap adjusting unit 146 is coupled to a pair of holding portions 141 to closely contact the lead tab connecting terminals 142a and 142b to the lead tab 30, thereby providing a gap between the pair of holding portions 141. Various configurations are possible by adjusting the configuration.

For example, as shown in FIG. 9, the gap adjusting unit 146 may move the first driving unit 146a to move one 142 of the pair of holding parts 141 in the Y-axis direction (based on the drawing). And a second driving part 146b for moving the other one of the pair of holding parts 141 in the Y-axis direction (based on the drawing) independently of the first driving part 146a.

The one gripper 142 is fixedly coupled to the first fixing member 147 which is linearly moved by the first driver 146a, and the other gripper 144 is linearly coupled by the second driver 146b. It may be fixedly coupled to the second fixing member 148 to be moved.

The pair of holding portions 141 may increase or decrease the distance between the surfaces facing each other according to the linear movement combination of the first driving portion 146a and the second driving portion 146b.

The first driving unit 146a and the second driving unit 146b may be actuators that generate driving force by pneumatic or hydraulic pressure, but are not limited thereto.

As shown in FIG. 12B, the pair of

gripping parts

142 and 144 are moved by the gap adjusting part 146 to be in contact with or separated from both sides of the lead tab 30.

Meanwhile, the insulation resistance measuring apparatus 100 according to the present invention may be electrically connected to at least two connection terminal portions of the plurality of connection terminal portions to measure the insulation resistance of the secondary battery cell 40. It may further include.

The insulation resistance measuring unit 200 is a circuit and control configuration, and is not necessarily limited to a physical configuration.

Specifically, as shown in FIG. 13A, the insulation resistance measuring unit 200 is electrically connected to the connection terminal part to apply a plurality of contacts for applying an input voltage for measuring insulation resistance of the secondary battery cell 40. An input voltage supply unit 210 provided; The control unit 220 may switch an electrical connection between the plurality of connection terminal units and the plurality of contacts in order to control the input voltages supplied to the plurality of connection terminal units.

For example, the input voltage supply unit 210 may include eight

contacts

1, 2, 3, 4, 5, 6, 7, and 8.

At least two (2, 4) of the contacts (1, 2, 3, 4, 5, 6, 7, 8) are connected to at least two pouches to test whether current flows through the pouch (20). It may be electrically connected to the terminal unit 130 (pouch energization test step).

In FIGS. 13A to 13C, contact point 4 is grounded as a reference voltage (output terminal X), and contact point 2 is illustrated as being connected to a voltage of -24V, but this is only an example and the present invention is not limited thereto.

Similarly, at least two of the

contacts

1, 2, 3, 4, 5, 6, 7, and 8, at least two of the contacts 6, 8 may be connected to each other to determine whether current flows through the lead tab 30. Can be electrically connected to the lead tab connection terminals 142a and 142b (lead tap current test step).

In FIGS. 13A to 13C, the contact point 8 is grounded as a reference voltage (output terminal Y), and the contact point 6 is shown to be connected to a voltage of -24V, but this is only an example and the present invention is not limited thereto.

In addition, at least one (1, 3) of the contact (1, 2, 3, 4, 5, 6, 7, 8) in order to measure the insulation resistance of the secondary battery cell 40 is a pouch connection terminal unit 130 ), And at least one of the remaining

contacts

1, 2, 3, 4, 5, 6, 7, and 8 may be electrically connected to the lead tap connection terminals 142a and 142b. Can be. In this case, input voltages V0 and W0 may be applied between the pouch connection terminal unit 130 and the lead tap connection terminals 142a and 142b.

That is, the pouch connection terminal portions 130 and the lead tab connection terminals 142a and 142b may be applied with voltage on each coin through the contact, and the pouch connection terminal portion 130 and the lead tap connection terminal 142a, respectively, may be applied. Input voltages V0 and W0 may be applied between 142b.

The insulation resistance measuring unit 200 may be configured as a tester circuit of a ready-made product, and may be, for example, a tester circuit for applying a predetermined voltage V0 and power W0 of a single phase through the R and S phases. It is not limited to this.

The control unit 220 may be configured in a variety of configurations to control the electrical connection between the plurality of contacts and the plurality of terminal units.

For example, the controller 220 may control an input voltage supplied to the plurality of connection terminal parts by switching a contact electrically connected to the plurality of connection terminal parts.

The controller 220 may be configured with various control circuits. For example, the controller 220 may be a relay circuit that performs sequence control for electrical connection between the plurality of connection terminal units and a contact point, but is not limited thereto.

The operation of the controller 220 will be described in detail with the secondary battery cell insulation resistance measuring method described later.

The loading unit (not shown) is configured to load the secondary battery cell 40 before the insulation resistance measurement by the secondary battery insulation resistance measuring apparatus 100 described above, and various configurations are possible. For example, the loading unit may include a pickup unit (not shown) that picks up the secondary battery cell 40 from the loading unit (not shown) on which the secondary battery cell 40 is loaded and transmits the secondary battery cell 40 to the insulation resistance measuring apparatus 100. It may include a transfer unit (not shown) for transferring the pickup portion from the loading portion to the insulation resistance measuring apparatus 100.

When the secondary battery cell 40 of the loading unit is loaded, a pair of

alignment body parts

122 and 124 of the cell alignment unit 120 may be smoothly loaded to the cell support unit 110 of the secondary battery cell 40. ) Is linearly moved in a direction away from each other, the secondary battery cell 40 is seated in the cell support 110, and then linearly moved in a direction closer to each other to freeze the secondary battery cell 40 supported by the cell support 110. It can be cut.

The transfer unit may be configured as a transfer line installed above the insulation resistance measuring apparatus 100, but is not limited thereto.

The unloading unit (not shown) may be configured to unload the secondary battery cell 40 in which the insulation resistance measurement is completed in the insulation resistance measuring apparatus 100.

The unloading unit may be configured as a separate member from the loading unit, but the loading unit may be implemented by performing the unloading function.

When the unloading of the secondary battery cell 40 by the unloading unit, a pair of alignment body portion of the cell alignment unit 120 so that the unloading of the secondary battery cell 40 from the cell support unit 110 can be made smoothly. Preferably, 122 and 124 are linearly moved in a direction away from each other.

Meanwhile, in the method of measuring insulation resistance of a secondary battery cell using an insulation resistance measuring device, the first electrode sheet 12 and the second electrode sheet 14 are alternately stacked, and the first electrode sheet 12 and the second electrode sheet are stacked. An electrode assembly 10 having a separator 16 positioned therebetween, a pouch 20 sealing the electrode assembly 10, and connected to the electrode assembly 10, protruding out of the pouch 20. As an insulation resistance measurement method for the secondary battery cell 40 including the lead tab 30, the present invention is not limited to the plate-shaped secondary battery cell 40, and any pouch type secondary battery cell 40 may be applied.

In the insulation resistance measuring method, as shown in FIG. 14, a pouch conduction test for testing whether a current flows through the pouch 20 by applying a voltage between at least two first measurement points of the pouch 20. Step S11; A lead tap energization test step (S13) of testing whether a current flows through the lead tab 30 by applying a voltage between at least two second measurement points of the lead tab 30; After the pouch conduction test step S11 and the lead tap conduction test step S13, an input voltage is applied between at least one first measurement point of the pouch 20 and at least one second measurement point of the lead tap 30. The cell insulation resistance measurement step (S15) of measuring insulation resistance between the pouch 20 and the lead tab 30 may be included.

Here, the measurement point means a point where the secondary battery cell 40 is in contact with the connection terminal portion (the pouch connection terminal portion 130 or the lead tap connection terminal portion 140) of the secondary battery insulation resistance measuring apparatus 100.

In the pouch conduction test step S11, whether a current flows through the pouch 20 by applying a voltage between at least two first measurement points of the pouch 20 (in particular, the current flows through the output terminal X). 13A, a predetermined voltage (V1, -24V) is applied between two first measurement points to which at least two pouch connection terminals 130 are contacted, as shown in FIG. 13A. It can be described as.

Referring to FIG. 13A, whether the current flowing through the output terminal X is an input value and whether the current is supplied through the pouch 20 and whether the pouch 20 is normal may be determined.

In this case, the remaining pouch connection terminals 130 except for the at least two pouch connection terminals 130 may exist in an electrically floating state, and all lead tap connection terminals 140 have coin positions (eg, ground). Can be applied.

In addition, the insulation resistance measuring method may further include a contact terminal adhesion step of bringing the pouch connection terminal unit 130 into close contact with the pouch connection terminal unit 130 for applying voltage to at least two first measurement points of the pouch 20 before the pouch conduction test step S11. It can be included as.

In this case, the insulation resistance measuring method, when the current does not flow through the pouch 20 despite the voltage applied to at least two first points of the pouch 20 in the pouch conduction test step (S11) (pouch connecting terminal ( 130 and the pouch 20 may be determined to be in poor contact, and the connection terminal part contact step may be performed again.

The insulation resistance measuring method, after performing the connection terminal contact step again, the pouch conduction test step (S11) again to test whether the pouch 20 is energized, if the current does not flow insulation resistance measuring apparatus 100 It may be determined that a defect of a component or an internal circuit of the insulation resistance measuring apparatus 100 has occurred, and thus inspection (maintenance) of the insulation resistance measuring apparatus 100 is necessary (S17).

That is, the cell insulation resistance measuring method according to the present invention performs the pouch conduction test before the actual insulation resistance measurement, so that even though the actual insulation resistance of the secondary battery cell 40 is lower than the reference value Ro, only the pouch 20 ) And the faulty contact or disconnection of the connection terminal part can prevent the measurement insulation resistance from exceeding the reference value Ro and misselection of good products.

In the pouch conduction test step S11, when a current flows through the pouch 20, the lead tap energization test step S13 may be performed (S12).

In the lead tap energization test step S13, whether a current flows through the lead tap 30 by applying a voltage between at least two second measurement points of the lead tap 30 (in particular, through the output terminal Y). Step of testing whether a current flows, and as shown in FIG. 13B, the voltage V2, which is set in advance between two second measurement points to which at least one pair of lead tap connection terminals 142a and -24V) can be described as the step of applying.

Referring to FIG. 13B, whether the current flowing through the output terminal Y is an input value and whether the current is supplied through the lead tab 30 and whether the lead tab 30 is normal may be determined.

In this case, except for the at least one pair of lead

tap connection terminals

146a and 146b, the remaining lead tab connection terminals 140 may be electrically floating, and the pouch connection terminals 130 may all have coin positions (for example, , Ground) may be applied.

In addition, the insulation resistance measuring method may include a close contact between the lead terminal connecting terminal 130 for applying voltage to at least two second measurement points of the lead tab 30 before the lead tap energizing test step S13. It may further comprise a step.

In this case, in the insulation resistance measuring method, when no current flows through the lead tab 30 even though a voltage is applied to at least two second measurement points of the lead tab 30 in the lead tap energization test step S13. It may be determined that the lead tab connection terminal 140 and the lead tab 30 are in poor contact, and the contact terminal adhesion step may be performed again.

After performing the contact terminal close contact step again, the lead tap conduction test step (S13) is performed again to test whether the lead tab 30 is energized, and if a current does not flow, the component of the insulation resistance measuring apparatus 100 is defective. In addition, it may be determined that disconnection has occurred in the internal circuit of the insulation resistance measuring apparatus 100, and thus it may be determined that the inspection (maintenance) of the insulation resistance measuring apparatus 100 is necessary (S17).

That is, the cell insulation resistance measuring method according to the present invention performs the lead tap energization test before the actual insulation resistance measurement, so that even though the actual insulation resistance of the secondary battery cell 40 is lower than the reference value Ro, only the lead tab is defective. It is possible to prevent inadvertent selection of the good insulation due to the poor contact or disconnection of (30) and the connection terminal part by exceeding the reference value Ro.

In the lead tap energization test step S13, when a current flows through the lead tap 30, the cell insulation resistance measurement step S15 may be performed (S14).

In the cell insulation resistance measuring step S15, after the pouch conduction test step S11 and the lead tap conduction test step S13, an input voltage is applied between the first measurement point and the second measurement point to provide the pouch 20. ) Is a step of measuring the insulation resistance between the lead tab 30 and a predetermined input between the first measurement point of the pouch 20 and the second measurement point of the lead tab 30, as shown in FIG. 13C. It may be described as a step in which the voltage V0 is applied.

The cell insulation resistance measuring step S15 is preferably performed only when current flows through the pouch 20 and the lead tap 30 in the pouch conduction test step S11 and the lead tap conduction test step S13.

The cell insulation resistance measuring step S15 may include a voltage value, a current value, and a resistance value measured between at least one first measurement point of the pouch 20 and at least one second measurement point of the lead tab 30. It may include a measuring step of measuring at least one of the measured value, and the quality selection step of determining whether the secondary battery cell 40 is a good quality based on the measured value.

For example, the measuring step may include an insulation resistance measuring step of measuring a resistance value measured between the first measuring point and the second measuring point as a measured value.

In this case, in the good-quality selection step, when the measured insulation resistance value is greater than or equal to the preset reference resistance value Ro, it is determined that the pouch 20 and the lead tab 30 are sufficiently insulated and the corresponding secondary battery cell 40 ) Can be determined as good quality (S16).

On the other hand, the secondary battery cell insulation resistance measurement method according to the present invention, in order to perform the pouch conduction test step (S11), the lead tap conduction test step (S13) and the cell insulation resistance measurement step (S15) in sequence, (20) The method may further include a voltage control step of controlling the magnitude of the voltage applied to the first measurement point and the second measurement point of the lead tap 30.

The voltage control step may be performed by the controller 220 of the insulation resistance measuring unit 200 illustrated in FIGS. 13A to 13C.

In the voltage control step, the second measurement point of the lead tab 30 may be grounded in the pouch conduction test step. That is, in the voltage control step, the lead tap connection terminal 140 may be switched to the grounded contact of the input voltage supply unit 210 by the controller 220 as shown in FIG. 13A.

And, the voltage control step, in the 'pouch conduction test step (S11) and the lead tap conduction test step (S13)' and 'between the lead tap conduction test step (S13) and the cell insulation resistance measurement step (S15), The magnitude of the test voltage applied to the first measurement point of the pouch 20 and the second measurement point of the lead tab 30 may be controlled.

Specifically, in the voltage control step, the first measurement point of the pouch 20 may be grounded after the pouch conduction test step S11 and before the lead tap energization test step S13. That is, in the voltage control step, the pouch connection terminal unit 140 may be switched to the grounded contact of the input voltage supply unit 210 by the controller 220 as shown in FIG. 13B.

Similarly, in the voltage control step, the second measurement point of the lead tab 30 may be grounded after the lead tap energization test step S13 and before the cell insulation resistance measurement step S15. That is, in the voltage control step, as illustrated in FIG. 13C, the pouch connection terminal unit 130 is switched by the controller 220 to a contact to which the input voltage V0 is applied, and the lead tap connection terminal unit 140 is grounded. Since the switch is switched to the contact point, the insulation resistance between the pouch connection terminal unit 130 and the lead tap connection terminal unit 140 may be measured.

Since the above has been described only with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as is well known, should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

Claims

The electrode assembly 10 in which the first electrode sheet 12 and the second electrode sheet 14 are alternately stacked with each other, and the separator 16 is positioned between the first electrode sheet 12 and the second electrode sheet 14. ), A secondary battery cell 40 including a pouch 20 for sealing the electrode assembly 10 and a lead tab 30 connected to the electrode assembly 10 and protruding to the outside of the pouch 20. Insulation resistance measurement method for

A pouch energization test step of testing whether a current flows through the pouch 20 by applying a voltage between at least two first measurement points of the pouch 20;

A lead tap energization test step of testing whether a current flows through the lead tab 30 by applying a voltage between at least two second measurement points of the lead tab 30;

After the pouch energization test step and the lead tap energization test step, an input voltage is applied between at least one of the first measurement point and the at least one second measurement point, thereby providing the pouch 20 and the lead tap 30. Insulation resistance measurement method comprising the step of measuring the insulation resistance between the insulation resistance.
The method according to claim 1,

The insulation resistance measuring method,

Before the pouch conduction test step, further comprising a contact terminal close contact step for contacting the pouch connection terminal 130 for applying voltage to the at least two second measuring points,

If the current does not flow through the pouch (20) in the pouch conduction test step, the insulation resistance measuring method characterized in that for performing the connection terminal contact step and the pouch conduction test step again.
The method according to claim 1,

The insulation resistance measuring method,

Before the lead tap conduction test step, further comprising a contact terminal contact step of closely contacting the lead tap connection terminal unit 140 for applying voltage to the at least two second measuring points,

If the current does not flow through the lead tab 30 in the lead tap energization test step, the contact resistance contact step and the lead tap energization test step, characterized in that to perform again.
The method according to claim 1,

The lead tap energization test step is performed when the current flows through the pouch (20) in the pouch energization test step.
The method according to claim 1,

The insulation resistance measuring step is performed when the current flows through the pouch (20) and the lead tab 30 in the pouch conduction test step and the lead tap conduction test step.
The method according to claim 1,

The insulation resistance measuring method,

And a voltage control step of controlling magnitudes of input voltages applied to the first measurement point and the second measurement point.
The method according to claim 6,

The voltage control step,

And the first measurement point is grounded after the pouch conduction test step and before the lead tap conduction test step.
The method according to claim 6,

The voltage control step,

And the second measurement point is grounded after the lead tap conduction test step and before the insulation resistance measurement step.
The method according to claim 6,

The voltage control step,

In the pouch conduction test step, the insulation resistance measuring method characterized in that the grounding of the second measuring point.
The method according to claim 1,

The insulation resistance measuring step,

A measurement step of measuring at least one of a voltage value, a current value, and a resistance value measured between the first measurement point and the second measurement point as a measurement value, and the secondary battery cell 40 is based on the measurement value. Insulation resistance measuring method comprising a good quality selection step of determining whether or not good quality.
The method according to claim 10,

In the measuring step, a resistance value measured between the first measurement point and the second measurement point is measured as a measurement value,

In the discrimination step, when the resistance value is greater than or equal to a preset reference resistance value, the pouch 20 and the lead tab 30 are determined to be insulated from each other, and the corresponding secondary battery cell 40 is determined as good quality. Insulation resistance measuring method, characterized in that.