KR101770325B1 - Battery Connector Comprising Connector Terminal with Position Control Portion and the Battery Pack Comprising the Same - Google Patents

Battery Connector Comprising Connector Terminal with Position Control Portion and the Battery Pack Comprising the Same Download PDF

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Publication number
KR101770325B1
KR101770325B1 KR1020140120900A KR20140120900A KR101770325B1 KR 101770325 B1 KR101770325 B1 KR 101770325B1 KR 1020140120900 A KR1020140120900 A KR 1020140120900A KR 20140120900 A KR20140120900 A KR 20140120900A KR 101770325 B1 KR101770325 B1 KR 101770325B1
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KR
South Korea
Prior art keywords
connector
battery
portion
lead
insulating housing
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KR1020140120900A
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Korean (ko)
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KR20160031207A (en
Inventor
고동완
윤석진
Original Assignee
주식회사 엘지화학
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Priority to KR1020140120900A priority Critical patent/KR101770325B1/en
Publication of KR20160031207A publication Critical patent/KR20160031207A/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/30Terminals
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/22Fixed connections, i.e. not intended for disconnection
    • H01M2/26Electrode connections
    • H01M2/263Electrode connections overlying wound or folded electrode stacks
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/20Current conducting connections for cells
    • H01M2/34Current conducting connections for cells with provision for preventing undesired use or discharge, e.g. complete cut of current
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00Batteries for particular applications
    • H01M2220/30Batteries in portable systems, e.g. mobile phone, laptop

Abstract

The present invention relates to an insulative housing, At least one connector terminal located inside the insulating housing and electrically connecting a first lead portion electrically connected to the battery cell and a second lead portion electrically connected to the external device; At least one first through-hole formed at one side of the insulating housing so that the first lead can pass through; And at least one second through-hole formed at an opposite side of the first through-hole in the insulating housing so that the second conductive line can pass therethrough, wherein at a position corresponding to the length of the first conductive line, And a battery pack including the battery connector, wherein the position adjusting portion is formed on the outer surface of the connector terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery connector including a connector terminal on which a position adjusting unit is formed, and a battery pack including the battery connector.

The present invention relates to a battery connector including a connector terminal on which a position regulating portion is formed, and a battery pack including the same.

Due to the development of technology and demand for mobile devices, the demand for secondary batteries is also rapidly increasing. Among them, lithium secondary batteries, which have high energy density, high operating voltage and excellent storage and life characteristics, It is widely used as an energy source.

The lithium secondary battery has a variety of combustible materials and has a serious disadvantage in terms of safety because of the risk of overheating, overcurrent, other physical external impact, etc., resulting in heat generation and explosion. Therefore, a lithium secondary battery is connected to a battery cell such as a PTC (Positive Temperature Coefficient) element and a protection circuit module (PCM) as a safety element that can effectively control an abnormal state such as overcharging or overcurrent.

Generally, the battery pack uses a plate-shaped battery cell suitable for the structure of the mobile device to which it is mounted, and the PCM, etc. are connected to the battery cell through a conductive nickel plate by welding or soldering. That is, the nickel plate is welded or soldered to the electrode terminal of the battery cell, the one side is attached to the PCB using the double-sided tape, the other side is attached to the battery cell, and then the electrode tab and the nickel plate are welded PCM is connected to a battery cell to manufacture a battery pack.

Such safety devices, including PCM, should maintain electrical connection with the electrode terminals while at the same time maintaining electrical isolation from other parts of the battery cell.

Therefore, the insulating tape is attached to each member including the PCM, and a complicated assembling process such as attaching an insulating tape or printing a bar code is performed by bending a part of the sealing portion of the battery case having the battery cell therein do.

As described above, since a plurality of insulating tapes or a plurality of parts are required to form a secure connection form, the assembling process of the battery pack is complicated and the manufacturing cost may increase.

Meanwhile, the secondary battery may be used in a detachable structure that is free to be inserted or removed depending on the type of the external device, or may be used as an embedded structure in which the secondary battery is embedded in an external device.

For example, in many cases, a battery of a mobile device such as a notebook computer, a mobile phone, or the like has been manufactured so as to be able to be inserted and removed according to the needs of the user. However, recently, due to miniaturization or lightening of mobile devices, The use of the built-in battery pack which can not be detached due to the restriction is increasing.

In addition, these mobile devices are fashion-sensitive and can make many changes in the design in a short period of time, which inevitably involves changing the specifications of some parts.

Particularly, in the case of a wire connecting the battery connector electrically connecting the mobile device and the built-in battery pack to the battery cell, the change of the specification such as the length is one of the frequent parts.

In order to improve the efficiency of the battery pack manufacturing process, it is common to manufacture a large number of basic parts such as wire once a specification such as a length is determined, and to manufacture the battery pack later by assembling them. Therefore, when the specification of the battery pack is changed in the middle, there arises a problem that wires already produced must be reworked and used.

If wires are not produced in advance in anticipation of a specification change, there is a problem that the manufacturing process speed of the battery pack is slow. On the contrary, when pre-produced wires are used without being reworked, There is a problem that the process efficiency is remarkably reduced because the defect rate of the mobile device incorporating such a cell is increased.

Therefore, there is a high need for a technique capable of quickly and efficiently coping with a length change without reworking a pre-manufactured wire, thereby reducing the defect rate of the battery pack and improving the manufacturing process efficiency.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments and have found that a position adjuster capable of fixing the connector terminal to the inside of the insulating housing at a position corresponding to the length of the first lead portion of the battery connector, The present invention has been accomplished on the basis of confirming that it is possible to effectively cope with a change in specifications in the case where a connector terminal formed on the outer surface is included.

Accordingly, a battery connector according to the present invention includes: an insulating housing; At least one connector terminal located inside the insulating housing and electrically connecting a first lead portion electrically connected to the battery cell and a second lead portion electrically connected to the external device; At least one first through-hole formed at one side of the insulating housing so that the first lead can pass through; And at least one second through-hole formed at an opposite side of the first through-hole in the insulating housing so that the second conductive line can pass therethrough, wherein at a position corresponding to the length of the first conductive line, And the position adjusting portion is formed on the outer surface of the connector terminal.

In the case of a battery pack, specifically, an embedded battery pack, the battery pack is electrically connected to an external device (for example, a mobile device) via a battery connector, The length is very important for the connection to the external device.

The length of the battery pack main body and the end of the battery connector is determined mainly by the length of the first lead wire portion. However, even if the length of the first lead wire portion is somewhat inferior to the reference specification, And fixing it by using the position adjusting portion at a position corresponding to the length of the first lead portion, the error can be corrected quickly and efficiently without reworking the first lead portion.

Therefore, when the battery connector according to the present invention is used, the specification of the battery pack can be satisfied even if the first lead portion is not reworked in accordance with the specification, so that the efficiency of assembling the battery pack can be improved.

In one specific example, the connector terminal includes a tangential portion of a folded plate structure that can be fixed in contact with the outer surface of the first lead portion, and a pair of connector arms that can be fixed in contact with the outer surface of the second lead portion connector arms.

The first wire portion may be formed of a conductive wire, and the tangent portion of the connector terminal may be clamped and connected to the outer surface of the conductive wire serving as the first wire portion.

The connector arms may have a structure in which ends of the connector arms are bent inwardly so as to be elastically contacted with an outer surface of the second lead wire.

In addition, connection protrusions may be formed on the inner side of the connector arms contacting the outer surface of the second conductive line portion, in order to improve the reliability of contact with the second conductive line portions.

In one specific example, the position adjuster may be formed on the outer surface of the connector terminal, and more specifically, on the outer surface of the tangent portion.

The position adjuster is not particularly limited as long as it can adjust the position of the connector terminal step by step, but it may be, for example, a saw tooth shape.

As described above, when the position adjusting portion is formed into a sawtooth shape, the position of the sawtooth shape can be adjusted by one unit, and a fixing force can be secured when the position adjusting portion is fixed to the insulating housing.

In addition, in order to more effectively construct the fixing force of the position adjusting portion by allowing the connector terminal to receive more tensile force toward the first lead portion when the tangential portion of the first lead portion is connected to the connector terminal, The angle of the tooth inclination surface of the first lead portion side can be made larger than the angle of the tooth inclination surface of the second lead portion side.

In one specific example, the length of the positioning portion may be 1 to 50% of the length of the connector terminal, and more specifically 1 to 30%.

In the case where the length of the position adjusting portion is less than 1% of the length of the connector terminal, the effect of correcting the error of the first lead portion by adjusting the position of the connector terminal is not large. There is a problem that the reliability of the connection between the first lead portion and the second lead portion is deteriorated.

The length of the position adjuster may be 0.1 to 4 mm, and may be 1 to 3 mm.

When the length of the position adjusting portion is less than 0.1 mm, the effect of correcting the error of the first lead portion by adjusting the position of the connector terminal is not large. When the length is more than 4 mm, Is too inefficient, and there is a problem that the reliability of the connection between the first lead portion and the second lead portion deteriorates.

In one specific example, the position adjuster may be fixed in position while deforming the inner surface of the first through hole of the insulating housing at a position corresponding to the length of the first lead. In this case, there is an advantage that the degree of freedom of position adjustment is increased.

In another embodiment, the insulating housing may have a fixing portion having a shape corresponding to the position adjusting portion of the connector terminal. In this case, the position adjusting portion may be formed in a shape corresponding to the length of the first lead portion, And can be fixed in position in combination with the fixing part.

In the case of the above structure, it is possible to improve the fixing force to the position adjusting part by the previously formed fixing part, and it is not necessary to deform the inner surface of the insulating housing at the time of assembling, so that the step of fixing the position adjusting part can be further simplified .

In one specific example, a first fastening portion may be formed on an outer surface of the insulating housing so as to be fastened to an external device connector by a mechanical fastening method. In the external device connector, a second fastening portion A fastening portion may be formed. As a result, even when an external force is applied to a connecting portion between the battery connector and the external device connector, the battery pack can be prevented from being disconnected from the external device.

The present invention also provides a battery pack including the battery connector.

The battery pack according to the present invention includes the battery connector; At least one battery cell in which a positive electrode terminal and a negative electrode terminal are formed; A protective circuit module (PCM) electrically connected to the battery cell through the positive terminal and the negative terminal; A pack frame mounted to enclose the PCM and the battery cell for fixing the battery cell and the PCM; And a first lead portion electrically connecting the PCM to the battery connector and exposed to the outside of the pack frame.

The battery cell may be a pouch-type battery in which an electrode assembly having a positive electrode / separator / negative electrode structure is sealed in a battery case of a laminate sheet including a metal layer and a resin layer.

The laminate sheet may be in the form of a resin layer having excellent durability, a barrier metal layer, and a heat-meltable resin sealant layer, and the resin sealant layers may be thermally fused to each other.

Since the resin outer layer must have excellent resistance from the external environment, it is necessary to have a tensile strength and weather resistance higher than a predetermined level. In this respect, polyethylene terephthalate (PET) and stretched nylon film may be used as the polymer resin of the outer resin layer, but are not limited thereto.

The barrier metal layer may be made of, for example, aluminum or an aluminum alloy so as to exhibit a function of improving the strength of the battery case, in addition to a function of preventing foreign matter such as gas or moisture from leaking or leaking.

The resin sealant layer may be a polyolefin resin having a low heat absorbing property (thermal adhesiveness) and low hygroscopicity in order to suppress the penetration of an electrolyte solution and which is not swollen or eroded by an electrolytic solution And in one specific example, lead-free polypropylene (CPP) may be used.

The battery cell may be a lithium secondary battery, specifically, a lithium ion battery or a lithium ion polymer battery.

The present invention also provides a device that incorporates the battery pack as a power source.

The device may further include an external device connector including a second lead portion electrically connected to a battery connector of the battery pack.

In one specific example, the second lead portion may be formed of a conductive connecting pin to improve connection with the first lead portion, and more specifically, may be a structure that is inserted into a connection hole formed in the first lead portion have.

The external device connector may have a structure in which a second fastening portion having a shape corresponding to the first fastening portion of the battery connector is formed on the outer surface and mechanically fastened to the battery connector through the second fastening portion. It is possible to prevent the connection between the battery connector and the external device connector from being released even when an external force is applied.

The device may be, for example, a notebook computer, a netbook, a tablet PC, a mobile phone, a smart phone, MP3, or a wearable electronic device, but is not limited thereto.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

As described above, the battery connector according to the present invention includes the connector terminal formed on the outer surface of the position adjusting portion, so that the length of the first lead portion can be corrected quickly and efficiently, and the efficiency Can be improved.

1 is a perspective view schematically showing a structure of a battery pack including a battery connector according to an embodiment of the present invention;
2 is a cross-sectional view schematically showing a battery connector according to one embodiment of the present invention;
3 is an enlarged schematic view of the connector terminal portion of Fig. 2; Fig.
4 is a schematic view showing an example of adjusting the position of a connector terminal of a battery connector according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

1 is a perspective view of a battery pack 100 according to an embodiment of the present invention. The battery pack 100 includes a battery cell 110, a PCM 120, a first conductive portion 130, a sheet tape 140 And a battery connector 200. The battery pack 100 is a battery pack having a battery connector 100 and a battery connector 100. [

1, the battery pack 100 includes two battery cells 110 and 111 facing each other. The PCM 120 is located between the battery cells 110 and 111, Terminals (not shown) of the ICs 110 and 111 are electrically connected to the PCM 120.

A pack frame (not shown) may be mounted to cover the battery cells 110 and 111 and the PCM 120 for fixing the battery cells 110 and 111 and the PCM 120.

The battery connector 200 is spaced apart from the battery cells 110 and 111 and the PCM 120 and is electrically connected to the PCM 120 by a first lead wire 130 formed of a conductive wire.

The first lead portion 130 is exposed to the outside of the PCM 120 and is bent 90 degrees in the middle in the traveling direction. The first lead portion 130 is fixed to the bent portion, And a safety tape 140 for improving safety is attached.

FIG. 2 is a sectional view of a battery connector 200 according to an embodiment of the present invention. The battery connector 200 includes an insulating housing 210, a first fastening portion 211, a connector terminal 220, a first through hole 230, The second through hole 240, and the first lead wire 250.

Referring to FIG. 2, the first fastening portions 211 are formed on outer surfaces of both upper ends of the insulating housing 210 so as to be fastened to external device connectors (not shown) by a mechanical fastening method. The insulating fastening portions 210 A first lead portion 250 electrically connected to a battery cell (not shown), and a connector terminal (not shown) for electrically connecting a second lead portion (not shown) electrically connected to the external device 220 are located.

A first through hole 230 is formed in the left lower end of the insulating housing 210 so that the first lead portion 250 can pass therethrough and a second lead portion 230 is formed in the left upper end of the insulating housing 210. The second through hole 240 is formed so that the second through hole 240 can pass therethrough.

In addition, the insulating housing 210 has a similar structure in which a connector terminal 220, a first lead portion 250, a first through hole 230, and a second through hole 240 are formed as one repeating unit Respectively, six connector terminals, first lead portions, first through-holes, and second through-holes.

Fig. 3 is an enlarged view of a portion of the connector terminal 220 of Fig. 2, and the connector terminal 220 is indicated by a shade.

Specifically, the connector terminal 220 is in contact with and fixed to the outer surface of the tangential line portion 221, the second conductive line portion (not shown), which is bent and fixed in contact with the outer surface of the first conductive line portion 250, And the connector arm 222 is bent inwardly so that the connector arm 222 can be elastically contacted to the outer surface of the second lead portion (not shown). In addition, the connection protrusion 223 is formed inside the connector arm 222, so that the reliability of contact with the second lead portion (not shown) can be improved.

The position adjusting portion 224 having a sawtooth shape is formed on the outer surface of the tangent portion 221, so that the position of the sawtooth shape can be adjusted by one unit, and the fixing force can be ensured.

Further, the bar in which the tangent unit 221 clamped against a first lead part 250, part 2, leads (not shown) side, as compared to the more tensile force acting towards the first wire unit 250, a first The angle of the tooth inclined surface of the lead portion 250 side is made larger than the angle of the tooth inclined surface of the second lead portion (not shown), so that the position adjusting portion 224 can be more easily fixed.

On the other hand, the insulating housing has a fixing portion 212 having a shape corresponding to the position adjusting portion 224 of the connector terminal 220. In this case, it is possible to improve the fixing force to the position adjusting portion 224, and it is not necessary to deform the inner surface of the insulating housing during assembly, so that the process of fixing the position adjusting portion 224 can be further simplified.

4 is a schematic view showing an example of adjusting the positions of the connector terminals 220a, 220b and 220c of the battery connector 200 according to an embodiment of the present invention.

The position adjustment portion of the connector terminal 220a is positioned at the center of the fixing portion corresponding to the first lead portion 250a, .

The position adjusting portion of the connector terminal 220b is fixed to the upper portion of the fixing portion, which is the position corresponding to the first lead portion 250b, so that the first lead portion 250b has a longer length than the reference specification. .

The position adjusting portion of the connector terminal 220c is fixed to the lower end of the fixing portion, which is a position corresponding to the first lead portion 250c, so that the first lead portion 250c has a shorter length than the reference specification. .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (20)

  1. An insulating housing;
    At least six connector terminals located inside the insulating housing for electrically connecting a first lead portion electrically connected to the battery cell and a second lead portion electrically connected to the external device;
    At least six first through-holes formed at one side of the insulating housing so that the first conductive line can pass through; And
    At least six second through-holes formed on opposite sides of the first through-hole in the insulating housing so that the second conductive line can pass through;
    / RTI >
    The position adjusting portion is formed on the outer surface of the connector terminal to fix the connector terminal to the inside of the insulating housing at a position corresponding to the length of the first lead portion,
    The insulative housing includes structures having a connector terminal, a first lead portion, a first through-hole, and a second through-hole as a single repeating unit,
    Wherein the position adjusting part is fixed in place while deforming the inner surface of the first through hole of the insulating housing at a position corresponding to the length of the first lead.
  2. The connector according to claim 1, wherein the connector terminal comprises: a tangential portion of a folded plate structure capable of being fixed in contact with the outer surface of the first lead portion; and a pair of connector arms connector arms of the battery connector.
  3. [3] The battery connector of claim 2, wherein the first lead portion is made of a conductive wire, and the tangent portion of the connector terminal is clamped to the outer surface of the first lead wire.
  4. The battery connector according to claim 2, wherein the connector arms are each bent inwardly so that the connector arms can elastically contact the outer surface of the introduced second conductive wire portion.
  5. The battery connector according to claim 4, wherein a connection protrusion is formed on the inner side of the connector arms contacting the outer surface of the second lead portion.
  6. The battery connector according to claim 2, wherein a position adjusting portion is formed on an outer surface of the tangential portion.
  7. The battery connector according to claim 1, wherein the position adjusting portion has a serrated shape.
  8. 8. The battery connector as claimed in claim 7, wherein a tooth shape of the position adjusting portion is larger than an angle of a tooth inclined surface of the first conductive portion side to an angle of a tooth inclined surface of the second conductive portion.
  9. The battery connector according to claim 1, wherein a length of the position adjusting part is 1 to 50% of a length of the connector terminal.
  10. The battery connector according to claim 1, wherein the length of the position adjusting part is 0.1 to 4 mm.
  11. delete
  12. The battery connector according to claim 1, wherein the insulating housing is formed with a fixing portion having a shape corresponding to the position adjusting portion of the connector terminal.
  13. 13. The battery connector as claimed in claim 12, wherein the position adjusting part is engaged with the fixing part of the insulating housing at a position corresponding to the length of the first lead part and fixed in position.
  14. The battery connector according to claim 1, wherein a first fastening part is formed on an outer surface of the insulating housing so as to be fastened to an external device connector by a mechanical fastening method.
  15. A battery connector according to claim 1;
    At least one battery cell in which a positive electrode terminal and a negative electrode terminal are formed;
    A protective circuit module (PCM) electrically connected to the battery cell through the positive terminal and the negative terminal;
    A pack frame mounted to enclose the PCM and the battery cell for fixing the battery cell and the PCM; And
    A first lead portion electrically connecting the PCM to a battery connector and exposed to the outside of the pack frame;
    And the battery pack (10).
  16. A device according to claim 15, wherein the battery pack is built as a power source.
  17. 17. The device of claim 16, wherein the device further comprises an external device connector including a second lead portion electrically connected to a battery connector of the battery pack.
  18. 18. The device of claim 17, wherein the second lead comprises a conductive connection pin.
  19. 18. The battery charger of claim 17, wherein the external device connector is formed with a second fastening portion having a shape corresponding to the first fastening portion of the battery connector on an outer surface thereof and mechanically fastened to the battery connector through the second fastening portion Device.
  20. 17. The device of claim 16, wherein the device is a notebook computer, a netbook, a tablet PC, a cell phone, a smart phone, an MP3, or a wearable electronic device.
KR1020140120900A 2014-09-12 2014-09-12 Battery Connector Comprising Connector Terminal with Position Control Portion and the Battery Pack Comprising the Same KR101770325B1 (en)

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KR1020140120900A KR101770325B1 (en) 2014-09-12 2014-09-12 Battery Connector Comprising Connector Terminal with Position Control Portion and the Battery Pack Comprising the Same

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Application Number Priority Date Filing Date Title
KR1020140120900A KR101770325B1 (en) 2014-09-12 2014-09-12 Battery Connector Comprising Connector Terminal with Position Control Portion and the Battery Pack Comprising the Same

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KR20160031207A KR20160031207A (en) 2016-03-22
KR101770325B1 true KR101770325B1 (en) 2017-08-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003115291A (en) 2001-10-02 2003-04-18 Yazaki Corp Connector for battery
JP2005505104A (en) * 2001-09-21 2005-02-17 タイコ・エレクトロニクス・コーポレイションTyco Electronics Corporation High current electrical connectors and terminals for automobiles
KR101195178B1 (en) * 2010-11-02 2012-10-29 금호전기주식회사 Light Emitting Diodes Lamp for Vehicle
KR101342507B1 (en) * 2011-09-02 2013-12-17 삼성에스디아이 주식회사 rechargeable battery pack

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005505104A (en) * 2001-09-21 2005-02-17 タイコ・エレクトロニクス・コーポレイションTyco Electronics Corporation High current electrical connectors and terminals for automobiles
JP2003115291A (en) 2001-10-02 2003-04-18 Yazaki Corp Connector for battery
KR101195178B1 (en) * 2010-11-02 2012-10-29 금호전기주식회사 Light Emitting Diodes Lamp for Vehicle
KR101342507B1 (en) * 2011-09-02 2013-12-17 삼성에스디아이 주식회사 rechargeable battery pack

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