KR101794942B1 - Battery Pack Having Coupling Member and Electrical Connected Groove - Google Patents

Abstract

A battery cell in which an electrode assembly is sealed inside a battery case together with an electrolytic solution, and electrode terminals are formed on an upper end thereof; A protection circuit module (PCM) in which a protection circuit for controlling overcharge, overdischarge, and overcurrent is formed, and terminal connection portions formed on a lower surface of the PCM so that the following connection members are coupled to the PCM assembly; A first connecting member and two second connecting members for electrically connecting the electrode terminals of the battery cell and the terminal connecting portions of the PCM; And an insulating cap coupled to the upper end of the battery cell while surrounding the PCM, wherein the battery case includes a case body having a top opened to insert the electrode assembly, Wherein the first connecting member is located at the center of the PCM assembly and is directly connected to the protruding terminal of the base plate and the second connecting members are located at both ends of the PCM assembly, Wherein a connecting recessed groove in which an end of the second connecting member connected to the battery cell is seated is formed at a portion of the upper surface of the base plate at which both second connecting members are connected to both ends of the upper surface of the base plate, And the insulating cap and the second connecting member are formed at both ends of the insulating cap, Provides a battery pack, it characterized in that it is coupled to the base plate by a fastening member extending through the recessed grooves for connection.

Description

(Battery Pack Having Coupling Member and Electrical Connected Groove)

The present invention relates to a battery pack in which a fastening member and a recess for connection are formed.

Lithium rechargeable batteries, which have been recently used, have a variety of combustible materials, and thus have a serious safety problem because of the risk of overheating, overcurrent, other physical external impact, and the like. Therefore, the lithium secondary battery is mounted with a protection circuit module (PCM), which is capable of effectively controlling an abnormal state such as overcharging, connected to the battery cell.

Generally, the PCM is connected to the battery cell by welding or soldering. For example, after a clad is attached to some electrode terminals of a battery cell, a nickel plate as a connecting member is welded to a connection terminal of the PCM and an electrode terminal of the battery cell, respectively, A battery pack is manufactured.

The clad is required when the battery case is joined to the positive electrode, which is a battery case, in a rectangular battery cell made of an aluminum can by resistance welding.

Such a battery pack is structurally unstable because one electrode terminal is connected to one connecting member and the plate-like clad and the connecting member are welded and connected in a state of being connected in a horizontal plane, There is a problem that can fall.

Therefore, a battery pack capable of solving the above problems is very necessary.

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.

More specifically, it is an object of the present invention to provide a battery pack which is structurally stable by firmly connecting the PCM assembly and the battery cell and can simplify the manufacturing process by eliminating the insulating mounting member mounted between the PCM assembly and the battery cell will be.

According to an aspect of the present invention, there is provided a battery pack comprising:

A battery cell in which an electrode assembly is sealed inside a battery case together with an electrolyte solution, and electrode terminals are formed on an upper end thereof;

A protection circuit module (PCM) in which a protection circuit for controlling overcharge, overdischarge, and overcurrent is formed, and terminal connection portions formed on a lower surface of the PCM so that the following connection members are coupled to the PCM assembly;

A first connecting member and two second connecting members for electrically connecting the electrode terminals of the battery cell and the terminal connecting portions of the PCM; And

An insulating cap coupled to an upper end of the battery cell while surrounding the PCM;

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The battery case includes a case body having a top opened to insert an electrode assembly, and a base plate coupled to an open upper end of the case body,

The first connecting member is located at the center of the PCM assembly and is directly connected to the protruding terminal of the base plate. The second connecting members are respectively located at both ends of the PCM assembly and are disposed on the upper surface of the base plate excluding the protruding terminal Directly connected,

Wherein both end portions of the upper surface of the base plate are formed with connecting indentation grooves for receiving end portions connected to the battery cells of the second connecting member at portions where the second connecting members are connected, The connecting member may be coupled to the base plate by fastening members passing through both ends of the insulating cap, the second connecting member, and the connecting indentation groove.

Therefore, the battery pack according to the present invention is characterized in that the insulating cap and the second connecting member are coupled to the base plate by the fastening member passing through both ends of the insulating cap, the second connecting member and the connecting indentation groove, It can be stably mounted on the top. In addition, by eliminating the insulating mounting member between the PCM assembly and the battery cell, the manufacturing process can be simplified and the raw material and personnel can be saved accordingly.

In one specific example, the connecting indentation groove may be formed in the same shape as the end portion of the second connecting member. Therefore, a stable structure can be achieved by restricting the movement on the horizontal plane while the second connecting member is connected to the base plate.

In one specific example, the PCM may be provided with a through hole for connection, and the first connecting member may be provided on the lower surface of the PCM so that at least a portion thereof may be exposed to the upper portion of the PCM assembly through the connecting through- It may be a bonded structure.

The second connecting member may be extended from both ends of the PCM assembly such that a portion electrically connected to the battery cell may be exposed from an upper portion of the PCM assembly.

In one specific example, the second connecting member may have a structure including a PCM connecting end, a vertically downwardly bent step from the PCM connecting end, and a horizontally bent battery cell connecting end from the step .

Specifically, a first screw groove is formed at both ends of the insulating cap, a second screw groove is formed at a portion corresponding to the first screw groove in the battery cell connecting end of the second connecting member, A bolt is inserted into the first screw groove, the second screw groove, and the third screw groove to connect the insulating cap, the second connecting member, and the battery cell, Fastening and electrical connection can be made.

The first screw groove and the second screw groove may have a structure of a through hole, and the third screw hole may have a structure of a recessed groove.

Further, in the process of inserting the bolt into the first screw groove and the second screw groove, the inner surface of the first screw groove and the second screw groove may be formed with a structure in which a bolt is introduced and fastened while generating a screw thread.

In the above structure, for example, the PCM connecting end and the battery cell connecting end may be structured parallel to each other with the stepped portion interposed therebetween, and surplus wrinkles are formed at the bent portion between the stepped portion and the battery cell connecting end Structure. Therefore, the surplus wrinkle can effectively absorb vibration or external impact generated in the process of manufacturing the battery pack.

The first connecting member may be a cathode connecting member, and the second connecting member may be an anode connecting member. For example, a prismatic battery cell has a structure in which an electrode terminal and a battery case protruded from an upper surface thereof are respectively a cathode and a cathode terminal, and an insulating member is interposed therebetween to form mutual insulation. Therefore, the first connecting member connected to the negative terminal, and the second connecting member connected to the upper end surface except for the protruding terminal of the base plate constituting the positive electrode terminal are connected to the circuits in the PCM and the electrode assembly Can be electrically connected.

At this time, the first connecting member and the second connecting member are not particularly limited as long as they are made of a conductive material, but they may preferably be made of nickel or a nickel alloy. It is possible to more easily connect the circuits of the PCM and the electrode assembly inserted into the battery case by using a nickel or nickel alloy having good electrical conductivity and good ductility and softness as the connecting member.

The battery pack according to the present invention may include an insulating tape between the PCM assembly and the top of the battery cell to prevent a short circuit due to contact between the bottom surface of the PCM assembly and the top of the battery cell when an external impact is applied.

Specifically, the insulating tape has a size smaller than the upper end surface of the battery cell in the length direction so as to secure a portion where the second connecting member is connected to the battery cell, and has a first opening And a second opening exposing the upper end of the case upper end portion of the battery cell ('sealed electrolyte inflow portion') at a predetermined distance from the first opening.

Therefore, since the insulating tape is formed to have a smaller length in the longitudinal direction than the upper end surface of the battery cell, a space is provided between the both side ends of the PCM assembly and both side ends of the upper end surface of the battery cell so that the second connecting member can be located .

Further, since the case body of the battery case is required to have ease of processing and mechanical strength of a certain level or higher, it can be made of a metal can, for example, an aluminum can or a stainless steel can.

In some cases, an outer film may be attached to the outer surface of the battery case. Thus, the battery cell can be protected from external impact and maintained in an electrically insulated state.

Meanwhile, the secondary battery pack according to the present invention can be applied to various types of battery cells regardless of the type and outer shape of the battery cells, and preferably to a battery pack including a prismatic lithium secondary battery as a battery cell.

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

The device may be selected from a mobile phone, a portable computer, a smart phone, a tablet PC, a smart pad, a netbook, a wearable electronic device, a notebook computer, and the like. The structure of these devices and their fabrication methods are well known in the art, and a detailed description thereof will be omitted herein.

As described above, in the battery pack according to the present invention, the insulating cap and the second connecting member are coupled to the base plate by the fastening members passing through both ends of the insulating cap, the second connecting member, and the connecting indentation grooves, Can be stably mounted on the upper end of the battery cell. In addition, by eliminating the insulating mounting member between the PCM assembly and the battery cell, the manufacturing process can be simplified and the raw material and personnel can be saved accordingly.

1 is a front view of a battery pack according to an embodiment of the present invention;
Fig. 2 is an enlarged view of the A and B regions of Fig. 1; Fig.
Figure 3 is a number plan view of the PCM assembly and connecting members and the insulating cap of Figure 1;
4 is a front view of a top portion of the battery cell of Fig. 1;
5 is a side cross-sectional view of a second connecting member according to one 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.

FIG. 1 is a front view of a battery pack according to an embodiment of the present invention. FIG. 2 is an enlarged view of portions A and B of FIG. 1, A numbered top view of the members and the insulating cap is shown, and Fig. 4 is a front view of a top portion of the battery cell of Fig.

1 to 4, a battery pack 100 includes a battery cell 110 in which an electrode assembly is sealed in a battery case together with an electrolyte, a PCM assembly 120 that effectively controls an abnormal state such as overcharging, A first connecting member 130 and two second connecting members 140 electrically connecting the electrode terminals of the battery cell 110 and the terminal connecting portions of the PCM assembly 120 and the PCM assembly 120 An insulating cap 150 coupled to an upper end of the battery cell 110 and a cover film 160 covering the outer surface of the battery cell 110 case.

A protruding terminal 112 protruding upward from the battery case in a state insulated from the battery case is formed on the upper end surface 114 of the base plate of the battery cell 110. The protruding terminal 112, The other part forms a bipolar terminal. In addition, the electrolyte injection portion 116 sealed with a metal ball, a polymer resin, or the like projects in a circular shape on a plane.

A third screw groove 117 is formed at both end portions of the base plate upper end surface 114 so as to be fastened by the second connecting members 140 and the insulating cap 150 and a bolt And a second screw groove 145 having a shape corresponding to the third screw groove 117 is formed in the second connecting members 140. A third screw groove 117 is formed at both ends of the insulating cap 150, And the first screw groove 151 corresponding to the second screw groove 145 are formed. A bolt (not shown) is inserted into the first screw groove 151, the second screw groove 145 and the third screw groove 117 formed as described above to connect the insulating cap 150 and the second connecting member 140 The battery cell 110 is tightened and an electrical connection is established.

The first screw groove 151 and the second screw groove 145 have a through hole structure and the third screw groove 117 has a recessed groove structure.

In the process of inserting the bolts (not shown) into the first screw groove 151 and the second screw groove 145, a screw thread (not shown) is formed on the inner surfaces of the first screw groove 151 and the second screw groove 145, A bolt (not shown) is introduced and fastened.

The PCM assembly 120 is provided with a through hole 121 for connection and the first connecting member 130 is connected to the PCM assembly (not shown) through the connecting through hole 121 to expose the upper portion of the PCM assembly 120 120, respectively.

The second connecting member 140 protrudes from both ends of the PCM assembly 120 so that a portion electrically connected to the battery cell 110 can be exposed from the top of the PCM assembly 120. The detailed structure of the second connecting member will be described later.

The outer surface of the battery case is attached with an outer film 160 for securing an electrically insulated state from the outside and displaying information on the product. The covering film 160 made of a heat-shrinkable material is manufactured in a tube shape and attached to the battery cell 110 in a structure in which the battery cell 110 is wrapped around the battery cell 110,

Fig. 5 schematically shows a side sectional view of a second connecting member according to one embodiment of the present invention.

5, a second connecting member 140 electrically connected to the top surface 114 of the base plate of the battery cell 110 includes a PCM connecting end 141, A stepped portion 142 bent downward from the end portion 141 vertically downward and a battery cell connecting end portion 143 horizontally bent from the stepped portion 142. The battery cell connecting end portion 143 has a structure including a PCM Surplus corrugations 144 are formed at the bent portions between the step portions 142 and the battery cell connection end portions 143 to absorb vibration due to an external impact or the like.

The second connecting member 140 is formed with the insulating cap 150 and the opposite ends of the battery cell 110 at the opposite ends of the battery cell 110. [ A second thread groove 145 and a first thread groove 151 formed in each of the third thread groove 117 formed in the upper face 114 of the base plate and the second connecting member 140 and the insulating cap 150, (Not shown) is coupled to the battery cell 110 for fastening and electrical connection. The first connection member 130 is connected to the protruding terminal 112 which is the negative terminal of the battery cell 110 so that the battery cell 110 and the PCM assembly 120 can be electrically connected to each other.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (19)

A battery cell in which an electrode assembly is sealed inside a battery case together with an electrolyte solution, and electrode terminals are formed on an upper end thereof;
A protection circuit module (PCM) in which a protection circuit for controlling overcharge, overdischarge, and overcurrent is formed, and terminal connection portions formed on a lower surface of the PCM so that the following connection members are coupled to the PCM assembly;
A first connecting member and two second connecting members for electrically connecting the electrode terminals of the battery cell and the terminal connecting portions of the PCM; And
An insulating cap coupled to an upper end of the battery cell while surrounding the PCM;
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The battery case includes a case body having a top opened to insert an electrode assembly, and a base plate coupled to an open upper end of the case body,
The first connecting member is located at the center of the PCM assembly and is directly connected to the protruding terminal of the base plate. The second connecting members are respectively located at both ends of the PCM assembly and are disposed on the upper surface of the base plate excluding the protruding terminal Directly connected,
Wherein both end portions of the upper surface of the base plate are formed with connecting indentation grooves for receiving end portions connected to the battery cells of the second connecting member at portions where the second connecting members are connected, The connecting member is coupled to the base plate by fastening members passing through both ends of the insulating cap, the second connecting member, and the connecting indentation groove,
The second connecting member has a structure including a PCM connecting end, a step bent vertically downward from the PCM connecting end, and a battery cell connecting end horizontally bent from the step,
A surplus wrinkle is formed at a bent portion between the step portion and the battery cell connecting end,
Wherein a first screw groove is formed in both end portions of the insulating cap and a second screw groove is formed in a portion corresponding to the first screw groove on the battery cell connection end of the second connecting member, A bolt is inserted into the first screw groove, the second screw groove and the third screw groove to connect the insulating cap and the second connecting member to the battery cell, The connection is made,
In the process of inserting the bolt into the first screw groove and the second screw groove, a thread is generated on the inner surfaces of the first screw groove and the second screw groove and a bolt is introduced and fastened,
Wherein the battery cell is a prismatic lithium secondary battery cell, and the case body of the battery case is a metal can. The battery pack according to claim 1, wherein the connecting indentation groove has the same shape as the end portion of the second connecting member. 2. The PCM according to claim 1, wherein a connection through hole is drilled in the PCM, and the first connection member is coupled to a lower surface of the PCM so that at least a part of the connection member can be exposed to the upper portion of the PCM assembly through the connection through- Wherein the battery pack is a battery pack. The battery pack according to claim 1, wherein the second connecting member protrudes from both ends of the PCM assembly so that a portion electrically connected to the battery cell can be exposed from an upper portion of the PCM assembly. delete delete The battery pack according to claim 1, wherein the first screw groove and the second screw groove are a structure of a through hole, and the third screw groove is a structure of a recessed groove. delete The battery pack according to claim 1, wherein the PCM connecting end and the battery cell connecting end are parallel to each other with a stepped portion therebetween. delete The battery pack according to claim 1, wherein the first connecting member is a negative electrode connecting member, and the second connecting member is a positive electrode connecting member. The battery pack according to claim 1, wherein the first connecting member and the second connecting member are made of nickel or a nickel alloy, respectively. The battery pack according to claim 1, wherein an insulating tape is interposed between the PCM assembly and the top of the battery cell. 14. The battery pack according to claim 13, wherein the insulating tape has a size smaller than a top surface of the battery cell in the length direction so as to secure a portion where the second connecting members are connected to the battery cell, Wherein a second opening is formed in the battery cell to expose the upper end of the case upper protrusion of the battery cell ('sealed electrolyte infusion part') at a predetermined distance from the first opening. delete The battery pack according to claim 1, wherein an outer film is attached to an outer surface of the battery case. delete A device, comprising at least one battery pack according to any one of claims 1 to 4, 7, 9, 11 to 14, 19. The device of claim 18, wherein the device is a mobile phone, a portable computer, a smart phone, a tablet PC, a smart pad, a netbook, a wearable electronic device, or a notebook computer.

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