KR100883601B1 - Motor - Google Patents

Abstract

The present invention relates to a motor, and more particularly, to a motor in which manufacturing cost is reduced and manufacturing and reliability are improved. The present invention relates to a stator having a stator core and an insulator provided in the stator and wound with a coil, A tab terminal provided in the insulator and formed with at least one slit at which the end of the coil is held, and inserted into the tap terminal to electrically connect the coil and an external electrical terminal, and at least to be electrically connected to the coil. A magmate having at least one slit and a contact portion in electrical contact with an external electrical terminal, and coupled to the outside of the tab terminal, electrically connecting the coil and the external electrical terminal, and formed of an insulating material to terminate the coil. And the coil is connected to the magmate And to prevent the coil exposed to the outside of the tap terminal corrosion, including a connector having isolated portions to isolate the coil and the outside provides a motor comprising.

Motor, aluminum, coil, tap terminal, connector

Description

Motor

1 is an exploded perspective view showing a stator of a motor according to the present invention;

2 is a perspective view of a rotor of a motor according to the present invention;

3 is a perspective view of a tab terminal;

Figure 4 is a side view showing a state in which the coil is coupled to the magnet of the motor;

5 is an exploded perspective view of a magmate and a step terminal of a motor;

Figure 6 is a side cross-sectional view showing a combined state of the motor mat and the step terminal.

7 is a sectional view of a connector;

8 is a side view showing the connector coupled to the tab terminal; and

9 is a perspective view illustrating a state in which a connector is coupled to a tab terminal.

<Explanation of symbols for the main parts of the drawings>

100: stator 110: stator core

120: upper insulator 128: tap terminal for power connection

140: connector 143: tab terminal accommodating portion

146: pocket portion 160: coil

The present invention relates to a motor, and more particularly, to a motor that reduces manufacturing costs and improves manufacturing and reliability.

The motor according to the present invention may be a motor applied to a washing machine, but the application example is not limited thereto.

In general, the motor transmits the rotational force of the rotor to the rotary shaft, the rotary shaft drives the load. For example, the rotating shaft may be connected to the drum of the washing machine to drive the drum, and may be connected to the fan of the refrigerator to drive the fan so that cold air is supplied to the required space.

On the other hand, in such a motor, the rotor is rotated by electromagnetic interaction with the stator. To this end, a coil is wound around the stator, and as the current is applied to the coil, the rotor rotates with respect to the stator.

The coil is generally formed of a copper material. This is because the copper material has excellent electrical conductivity and excellent ductility, so that the damage of the winding is small.

However, the copper material generally has a very high cost and accordingly a manufacturing cost of the motor increases. In addition, international demand for copper has soared, preventing stable supply of raw materials.

Therefore, it is necessary to reduce the manufacturing cost of the motor by using a coil of a material other than the copper coil and to ensure a stable supply and demand of raw materials. In addition, even if coils of different materials are used, it is necessary to manufacture motors of at least equivalent quality than those of conventional copper coils.

On the other hand, when replacing a coil of copper material with a coil of another material, it is preferable not to greatly change the conventional configuration. This is because, even if the cost of the coil itself is reduced, initial capital investment costs may be excessively increased if other necessary components must be newly designed and manufactured.

The present invention basically aims to solve the above problems.

More specifically, an object of the present invention is to reduce the cost of the coil to reduce the overall manufacturing cost of the motor.

In addition, an object of the present invention is to provide a motor that reduces the manufacturing cost of the motor, but is easy to manufacture and improved reliability and product durability.

In addition, it is an object of the present invention to provide a motor having a quality equal to or greater than that of a conventional motor without significantly changing the conventional essential components.

The present invention to achieve the above object, the stator core and a stator having an insulator provided in the stator is wound coil; A tab terminal provided in the insulator and formed with at least one slit at which the end of the coil is caught; A mat inserted into the tab terminal and having at least one slit for electrically connecting with the coil and a contact portion in electrical contact with an external electrical terminal; and coupled to the outside of the tab terminal, the coil and an external electrical It provides a motor electrically connected to the base terminal, comprising a connector formed of an insulating material and having an isolation portion for isolating the coil and the portion where the coil is connected to the magmate from the outside.

The coil is preferably formed with a double coating film formed outside the core wire to reinforce strength and ductility. In addition, the coil in which the coating film is formed allows the core wire to be partially exposed in order to be in electrical contact with the magmate, and the part where the core wire is partially exposed is weak in strength and can easily be corroded and can easily be corroded. The portion is preferably provided to surround the exposed core line portion.

The connector includes a vertical portion coupled to the tab terminal, an external electrical terminal accommodating portion formed to extend from the vertical portion and accommodating an external electrical terminal, and integrally provided inside the connector, wherein the tab terminal accommodating portion and a fraudulent external electric It is desirable to have an electrical terminal exposed to the terminal accommodating portion to form an electrical contact.

More preferably, the isolation part includes a tab terminal accommodating part formed to surround all of the outer shape of the tab terminal at the end of the vertical part, and a rib extending a predetermined length from the horizontal part to cover the coil exposed to the outside of the tab terminal. It is preferable to have a pocket part to make.

The tab terminal accommodating portion is formed to surround all of the outer shape of the tab terminal. In addition, the end of the vertical portion of the tab terminal is preferably formed such that the position is located below a predetermined height than the slit. In this case, the connector surrounds all of the outer shape of the tab terminal to completely block the outside and the tab terminal.

 And the rib portion of the pocket is preferably provided to extend below the height of the coil exposed to the outside of the tab terminal. Coils coupled to the tab terminals are exposed to the outside of the tap terminals for winding, which may cause corrosion, but the pockets may completely cover the exposed coils, thereby preventing external moisture from penetrating.

Preferably, the motor includes an insulation part that protects and insulates the coil and a portion in which the coil is connected to the magmate. The insulating portion is preferably made of a resin material so that the insulating portion can easily penetrate the exposed portion of the core wire.

One of the slits is a passage through which resin material is permeated into the tap terminal, so that the resin material which prevents corrosion from the outside surrounds the coil as an insulation. Therefore, through the slit, it is possible to apply a resin as an insulation to the portion where the coil is located to reinforce the strength of the coil and to prevent the coil from corroding.

Preferably, the tab terminal further includes a strength reinforcing part on the outside to prevent deformation or breakage of the shape of the tap terminal, which may occur when the magmate or other member is inserted into the tab terminal.

Preferably, the strength reinforcing part is formed such that the strength reinforcing part slit formed to correspond to the slit is formed by hanging the coil. In this case, a problem such as coil disconnection that occurs when the coil is wound while the coil is caught only in the slit of the tab terminal is caused by the strength reinforcing slits to hold the coil in a larger area. There is an effect that is prevented.

The strength reinforcing portion is preferably formed integrally with the step terminal. In addition, the strength reinforcing portion is formed inside the pocket for receiving the resin, the pocket is preferably in communication with the inside of the tab terminal through the slit. In this case, by applying the resin material to the strength reinforcing portion, it is possible to apply the resin material to the coil inside the stepped terminal so as not to contact the resin material on the contact surface of the contact portion.

In addition, the strength reinforcing portion is preferably formed to be lower than the height of the stepped terminal. More preferably, the resin is made to have a height that can adequately wrap the coil inside the tab terminal. In this case, the resin material may be applied through the strength reinforcement part to apply a quantitative resin material. Accordingly, the resin material may be automatically coated instead of manually, thereby simplifying the production process.

Hereinafter, a motor according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings show a motor for a washing machine. However, the present invention is not necessarily limited to the motor for a washing machine.

First, the motor structure according to the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is an exploded perspective view of a stator of a motor according to the present invention.

The stator 100 includes a stator core 110, an upper insulator 120, and a lower insulator 130.

The stator core 110 includes an annular back yoke 111 and a tooth 112 protruding radially outward along an outer circumference of the back yoke. FIG. 1 illustrates a stator of an outer rotor type motor which is provided with a rotor described later outside the stator core 110 and rotates. Accordingly, the teeth 112 may protrude radially inward along the inner circumference of the back yoke. In this case, the stator will be the stator of the inner rotor type motor.

On the other hand, the stator core 110 may be formed by laminating a steel sheet. However, in the case of using such a method, the steel sheet fragments, etc., generated in a circular shape inside are not necessary, and there is much room for waste of materials. Therefore, the strip-shaped yoke and the teeth vertically protruding from the back yoke are preferably bent and spirally stacked to form a spiral core. This spiral core form is shown in FIG. 1.

In addition, the stacked annular back yoke 111 is formed with a caulking portion 113 such that each layer is coupled to each other to form a stator core integrally.

A coil (not shown) is wound around the tooth 112. However, since the tooth is generally a conductor material, an insulator for insulation is generally provided between the tooth and the coil. Therefore, in the present invention, the insulators 120 and 130 are provided on the upper and lower portions of the stator core 110, respectively. That is, the upper insulator 120 and the lower insulator 130 are combined with the stator core 110 to surround the stator core. At this time, a coil is wound around the windings 121 and 131 surrounding the teeth 112.

However, unlike FIG. 1, the insulators 120 and 130 may be integrally formed with the stator core 110. For example, it is possible that the stator core is insert injection molded and formed integrally with the insulator.

Meanwhile, fastening bosses 125 and 135 protruding in the radial direction are formed inside the insulators 120 and 130, and the stator 100 is positioned on the rear wall surface of the tub of the drum washing machine (not shown). Fastening holes 126 and 136 are formed to be fixed. Of course, the fastening bosses 125 and 135 may not necessarily be configured to be fixed to the tub, and may be fixedly coupled to a bracket (not shown) or a motor housing (not shown) forming the outer shape of the motor according to the application example. It may be a configuration for.

That is, the fastening hole 126 of the upper insulator and the fastening hole 136 of the lower insulator correspond to each other when the upper insulator, the stator core, and the lower insulator are combined to form one fastening hole. The entire stator is fixed to the tub or the like through a bolt (not shown) in the fastening hole.

In addition, a positioning protrusion 127 may be formed near the fastening hole 126 of the upper insulator. That is, the positioning protrusion may be first inserted into a groove (not shown) formed in a tub or the like to determine the position of the stator 100, and then the stator 100 may be fixed by using the above-described bolt.

Meanwhile, a coil corresponding to each of u, v, and w phases may be wound in the stator illustrated in FIG. 1. One coil may be wound around one tooth so that one tooth has one magnetic pole. This is called the concentration zone. The more stator stimulation, the lower the maximum rotation speed of the rotor. Therefore, it is easy to control the motor, and the maximum torque can also be relatively large.

First, when the winding of the u-phase coil is terminated in one tooth, the coil is wound around the coil winding ribs 122 formed in the upper insulator and fixed, and then wound again in the next tooth after crossing two neighboring teeth. The start and end of this coil are located at the tap terminal 128 and the neutral tap terminal 129 for power connection, respectively.

Here, the connector 140 is coupled to the tap terminal for power connection, and power of three phases is applied to the coils of each of u, v, and w phases. In addition, the ends of the coils of each phase are all electrically connected to each other at the neutral point terminal terminal 129 to form a neutral point.

Here, the tab terminals 128 and 129 are formed of an insulating material, preferably, integrally with the insulator.

Meanwhile, the hall sensor assembly 141 is fixed to one side of the tap terminal, that is, the tap terminal 128 for power connection and the neutral tap terminal. Through the Hall sensor assembly, the rotation speed and torque of the rotor can be controlled by sensing the position and / or speed of the rotor to be described later and adjusting the phase and current strength of the applied voltage.

Insulator ribs 123 are formed in the radially inner side of the coil winding rib 122 along the circumferential direction. Of course, such insulator ribs 123 are formed in the lower insulator as well as the upper insulator. The insulator rib 123 is formed to a predetermined height or more to perform a function of blocking the flow of moisture inside the insulator to the windings 121 and 131.

In addition, the insulator rib 123 is preferably formed to be higher than the height of the coil winding. This is because the coil may be damaged when the stator 100 is handled or the like. That is, when placed on the floor, only the insulator rib 123 is in contact with the floor, and the coil is not in contact with the floor, thereby preventing damage to the coil in advance.

Figure 2 is a perspective view of the rotor of the motor according to the present invention.

The rotor 200 according to the present invention includes a rotor frame 210 and a permanent magnet 216.

The rotor frame 210 includes a base 212 and side wall portions 211 formed on the outer side of the base, which may be formed by pressing a single iron plate. Here, a plurality of permanent magnets are provided inside the sidewall portion along the circumferential direction. These permanent magnets are magnetized to the north pole and the south pole alternately along the circumferential direction.

The side wall portion 211 performs a back yoke function of forming a magnetic path.

Of course, the rotor frame described above may be formed by injection, in which case the annular magnetic back yoke should be provided separately.

In addition, the center portion of the base 212 is formed with a hub portion 213 protruded upward for rigid reinforcement of the base. The hub portion 213 has a through hole 219 is formed in the center, the rotation axis (not shown), for example, the rotation axis of the washing machine is located. In addition, the rotation shaft and the hub portion 213 are connected to each other using a connector, not shown. Therefore, as the rotor is rotated, the rotational force of the rotor is transmitted to the rotating shaft.

In addition, the hub portion 213 may be provided with a coupling hole 214 for coupling the aforementioned connector, or a positioning groove 215 for determining the position of the connector first.

The rotor 200 accommodates the stator 100 therein, and rotates with respect to the stator 100 through the interaction of the stator 100. Of course, the rotational force of the rotor is coupled to the rotor frame 210 to be transmitted to a rotating shaft (not shown) to rotate integrally.

In the present invention, it is characterized by using a coil made of an aluminum core wire instead of a conventional copper coil. Aluminum has a higher internal resistance than copper. Therefore, in order to reduce such internal resistance, the outer diameter needs to be increased as compared with the conventional copper coil.

In addition, the aluminum material is weaker than the copper material. Therefore, there is a fear that the wire is easily disconnected by an external impact during winding. In addition, the aluminum material is susceptible to water, in particular, brine, so there is a high risk of being easily corroded and disconnected when it comes in contact with the brine.

Therefore, in the motor according to the present invention, the aluminum coil is preferably formed with a double coating film formed outside the core wire of the aluminum material to reinforce strength and ductility. In addition, it is possible to further increase the reliability of the coil insulation through the double coating film.

Meanwhile, as described above, the end of the coil is positioned at the tab terminal. In order to electrically connect the ends of the coils, the coating layer must be removed to expose the core wires to the outside. Therefore, as described above, the end portion of the coil to which the core wire is exposed is weak in strength and ductility, and thus may be easily disconnected. In addition, there is a problem that can be easily corroded when in contact with water, especially brine.

Therefore, the present invention is characterized in that it comprises an insulating portion for strength reinforcement, corrosion protection and insulation of the end portion of the coil. Such an insulation part may be formed in various ways, and hereinafter, the insulation part will be described in detail with reference to FIGS. 3 to 6.

3 is a perspective view showing a tap terminal 128 for power connection. The tab terminal is formed with a space 161 into which a magmate (not shown) can be inserted. In addition, the slit 162 is formed at the front and the rear of the space, respectively, so that the end of the coil is caught on the slit 162 of both sides. On the other hand, it is preferable that the chamfer 163 or round is formed in the upper portion of the slit so that the coil can be easily inserted.

Meanwhile, one side of the tab terminal may be connected to the insulator rib 123 described above.

An outer portion of the tab terminal further includes a strength reinforcing portion 238 for reinforcing strength.

The strength reinforcing portion 238 is formed on one side of the tab terminal. More specifically, the strength reinforcement 238 may be formed in the radially inner side and / or outer side of the tab terminal. However, in consideration of the convenience of fixing the coil end, it is preferable to be formed on the radially outer side of the tab terminal. In addition, the tab terminal is preferably formed integrally with the insulator.

Meanwhile, the slit 129 is preferably formed in the strength reinforcing portion 238 similarly to the tab terminal. Thus, the end of the coil is fixed to the slit 129 of the strength reinforcing portion and the slit 162 of both of the tab terminal to further secure the fixed strength.

In addition, the widths of the slits 129 and 162 may be formed to correspond to the outer diameter of the coil 160.

In addition, the strength reinforcement portion 238 is preferably formed with a pocket (not shown) is formed inside a predetermined space. This pocket is preferably in communication with the inside of the tab terminal through the slit 162. Thus, the coil 160 is secured to the tab terminal across the pocket.

The magmate 150 is formed in a 'c' shape, the slit 151 is formed on the front and rear, respectively. The width of the slit 151 is preferably formed corresponding to the core thickness of the coil. That is, it is preferable that the core wire of the coil is forcibly inserted into the slit 151 and is electrically connected to the magmate 150 at the same time. Therefore, the magmate 150 should be formed of a conductive material.

In addition, the magmate 150 has a contact portion 152 in electrical contact with an external electrical terminal.

Here, the electrical connection between the magmate and the coil end is as described above, after the end of the coil is located in the slit 162 of the tab terminal, the magmate is inserted into the space portion 161 of the tab terminal The core wire 160b may be exposed. However, after exposing the core wire 160b, the magmate may be inserted and the electrical connection may be made at the same time.

The ends of the magmate and the coil 160 are electrically connected in the tab terminal, which is in direct contact with the core wire 160b of the coil and the magmate made of a conductive material. Thus, a specific portion of the coil 160 in direct contact with the magmate is in a state in which the coating film, in particular the double coating film 160a, is removed.

Therefore, when the coil 160 is shaken or an external impact is applied, the core wire 160b of the coil which is in direct contact with the magmate may be disconnected as described above. Moreover, there exists a possibility that corrosion may generate | occur | produce in this part.

In order to prevent such a problem in advance, it is preferable that an insulation part is formed at a portion where the core wire 160b of the coil and the magmate 150 contact each other.

The insulating part may be provided with a resin material as shown in FIG. 6, and the resin material 270 is formed of an insulating material, and is coated and cured to maintain insulation in the core wire 160b and to remove the core wire from the outside. Protect. Of course, the external force is directly prevented from being transmitted to the core wire 160b to reinforce the strength of the core wire 160b.

Preferably, the resin material 270 wraps not only the exposed portion of the core 150b of the magnet 150 and the coil, but also a portion of the coil 160 in which the coating layer 160a is not removed.

Since the tap terminal is a tap terminal 128 for power connection, the magmate 150 must be connected to a power source. Therefore, it will be desirable to prevent the resin from being applied to the contact portion 152 for such a connection. Therefore, the resin material 270 may be applied outside the tab terminal 128 to penetrate into the tab terminal 128 through the slit 162. More preferably, the resin material 270 is applied as the insulating part through the strength reinforcing part. In this case, the height of the strength reinforcing portion is formed to be lower than the height of the tab terminal, it is preferable that the resin 270 to be a height that can appropriately wrap the coil inside the tab terminal. When the resin material 270 is applied through the strength reinforcing part, the resin material 270 can be applied in a fixed amount through the strength reinforcing part, and thus, the resin material 270 can be applied automatically instead of manually. It will be possible.

7 through 9 illustrate a connector 140 including a power supply terminal for making an electrical connection with a magmate of the tab terminal as an insulator.

The connector 140 extends from the vertical portion 145 having the tab terminal accommodating portion 143 accommodating the tab terminal at one end and the vertical portion 145 and receives external electric terminals. An electrical terminal integrally provided in the terminal accommodating part 142 and the connector to be exposed to the tab terminal accommodating part 143 and the external electric terminal accommodating part 142 to form electrical contact with the contact part 152. 149), a pocket portion 146 formed of a rib 147 extending a predetermined length from the horizontal portion to cover the coil exposed to the outside of the step terminal.

The connector 140 is coupled to the outside of the tab terminal 128, electrically connects the coil 160 and the external electric terminal, and formed of an insulating material to expose the end of the coil and the coil to corrode. To isolate the coil from the outside to prevent it. That is, the tab terminal cover may prevent corrosion of the exposed portion of the coil, and at the same time, strengthen the strength of the coil end. That is, external shock may be prevented from being directly transmitted to the coil through the tab terminal cover.

The connector 140 is inserted from an upper portion of the tab terminal. In this case, the tab terminal accommodating part 143 surrounds the outer shape of the tab terminal 128 to block the outside and the tab terminal. In addition, the rib of the pocket portion 146 extends below the height at which the coil exposed to the outside of the tab terminal is placed. Therefore, even if the coil 160 is exposed to the outside of the tab terminal, such a portion is wrapped by the pocket portion 146, so that the coil 160 is only inside the connector 140, As shown in FIG. 9, the coil 160 exposed inside the tab terminal and for winding is completely isolated from the outside by the connector 140. Thus, insulation and corrosion protection of the coil exposed portion can be performed.

The connector 140 functions to completely insulate the magmate from the outside. Therefore, there is a problem that the magmate is difficult to be electrically connected to other parts than the coil. Therefore, the inside of the connector 140 is provided with an electrical terminal 149 to be in electrical contact with the outside, one end of the vertical portion 145 and one end of the horizontal portion 144 of the connector 140. Is exposed to.

The connector 140 shown in FIG. 8 is covered with an upper portion of the tab terminal where the magmate and the coil 160 are exposed. The connector 140 is preferably inserted to receive the tab terminal 128 deeper than the portion of the slit 162 of the tab terminal. That is, when the connector is fully inserted to receive the tab terminal, it is preferable that the position of the end of the vertical portion 145 of the connector is positioned below a predetermined height than the slit 162. This is to prevent the penetration of external moisture through the slit 162 in advance.

In addition, the coil 160 coupled by the magmate to the tab terminal 128 is exposed to the outside of the tap terminal 128 for winding, which may cause corrosion. Therefore, the connector 140 has a pocket 146 formed of the rib 147 extending downward from the horizontal portion 144 so that the exposed coil 160 should cover the exposed length of the rib 147. When the 140 is inserted into the tab terminal 128, it is preferably provided to a length that can completely cover the coil 160 exposed to the outside of the tab terminal 128. This is to prevent external moisture from penetrating.

Although the present invention has been described with reference to the preferred embodiment, the person skilled in the art will be able to implement another embodiment of the modified form within the essential technical scope of the present invention. .

According to the present invention is to reduce the cost of the coil applied to the motor as a whole can reduce the manufacturing cost of the motor.

In addition, according to the present invention, while reducing the manufacturing cost of the motor, it is possible to provide a motor that is easy to manufacture and improved reliability and product durability.

In addition, according to the present invention, it is possible to provide a motor having a quality equal to or higher than that of a conventional motor without significantly changing the conventional essential components.

Claims (15)

A stator having a stator core and an insulator provided in the stator to which a coil is wound; A tab terminal provided in the insulator and formed with at least one slit at which the end of the coil is caught; A magnet inserted into the tab terminal and having at least one slit for electrically connecting with the coil and a contact portion in electrical contact with an external electrical terminal; and A connector coupled to the outside of the tab terminal and electrically connecting the coil and the external electric terminal, the connector having an isolation portion formed of an insulating material to isolate a portion of the coil and the coil connected to the magnet from the outside; , The isolation unit is characterized in that it comprises a tab terminal receiving portion formed to surround the outer shape of the tab terminal. The method of claim 1, The coil is a motor, characterized in that the double coating film is formed on the outside of the core wire for reinforcement of strength and ductility. The method of claim 2, The coil is characterized in that the part of the core wire is partially exposed is connected to the slit of the magmate. The method of claim 1, The connector, A vertical portion coupled to the tab terminal; An external electric terminal accommodating part extending from the vertical part and accommodating an external electric terminal; And an electrical terminal provided integrally in the connector and exposed to the tab terminal accommodating portion and the external electrical terminal accommodating portion to form an electrical contact. delete The method of claim 1, The isolation unit, And a pocket part formed of a rib extending a predetermined length from the horizontal part to cover the coil exposed to the outside of the tab terminal. The method of claim 6, The end of the vertical portion of the tab terminal is formed so that the position is located below the predetermined height than the slit. The method of claim 6, The rib of the pocket part is provided to extend below the height of the coil exposed to the outside of the tab terminal is provided. The method of claim 3, Wherein one of the slits of the tab terminal is a passage for insulating a resin provided to surround the exposed core wire into the tap terminal to insulate the coil inside the tab terminal. The method of claim 1, The motor is characterized in that it comprises an insulating portion for protecting and insulating the coil and the portion in which the coil is connected to the magmate. 11. The motor according to claim 10, wherein the insulating portion is a resin material, and one of the slits of the tab terminal is a passage through which the resin material penetrates into the step terminal. The method of claim 11, The tab terminal further comprises a strength reinforcing portion on the outside. The method of claim 12, The strength reinforcing part is the motor is characterized in that the coil is caught in the position and the strength reinforcing part slit formed corresponding to the slit is formed. The method of claim 12, The strength reinforcing portion motor, characterized in that formed integrally with the step terminal. The method of claim 11, The strength reinforcing portion is formed inside the pocket for receiving the resin material, wherein the pocket is in communication with the inside of the tab terminal through the slit.

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