KR102232118B1 - Battery Cell Welding Zig Comprising Connecting member Fixing Part - Google Patents

Abstract

The present invention includes a base part in which a plurality of battery cells are seated on one surface so that the electrode terminals are arranged in the same direction; A connection member fixing portion located at one outer periphery of the base portion in which the electrode terminals are arranged and the other outer periphery opposite to the outer periphery of the base portion, and to which connection members composed of metal plates electrically connecting the electrode terminals are fixed; And a support portion formed on at least one outer periphery of the outer peripheries other than the outer periphery of the base portion where the connecting member fixing portion is located, and supporting the arrangement of the battery cells, wherein the connecting member fixing portion , Corresponding to the location and shape of each of the connecting members, a rib for fixing the outer periphery protruding outward so as to surround the outer periphery of the connecting members; And a magnetic member positioned at a portion facing the connection members so that the connection members are fixed by magnetic force.

Description

Battery Cell Welding Zig Comprising Connecting Member Fixing Part}

The present invention relates to a battery cell welding jig including a connection member fixing portion.

Recently, interest in environmental pollution and rising prices of energy sources due to depletion of fossil fuels has been amplified, and the demand for eco-friendly alternative energy sources has become an indispensable factor for future life. Accordingly, research on various power generation technologies such as nuclear power, solar power, wind power, and tidal power is continuing, and a power storage device for more efficient use of the energy produced in this way is also attracting great interest.

In particular, as technology development and demand for mobile devices increase, the demand for batteries as an energy source is rapidly increasing, and accordingly, many studies on batteries that can meet various demands are being conducted.

Typically, in terms of the shape of the battery, there is a high demand for prismatic secondary batteries and pouch-type secondary batteries that can be applied to products such as mobile phones with a thin thickness, and in terms of materials, it has advantages such as high energy density, discharge voltage, and output stability. There is high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

In addition, secondary batteries are classified according to the structure of an electrode assembly having a stacked structure of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. A jelly-roll type (wound type) electrode assembly wound with a separator interposed therebetween, a stacked (stacked) electrode assembly in which a plurality of anodes and cathodes cut into units of a predetermined size are sequentially stacked with a separator interposed therebetween In recent years, in order to solve the problems of the jelly-roll type electrode assembly and the stack type electrode assembly, as an electrode assembly of an advanced structure, which is a mixture of the jelly-roll type and the stack type, A stack/folding electrode assembly having a structure in which the unit cells stacked with the anode and the cathode interposed between the separator and the unit cells stacked on the separation film were sequentially wound up has been developed.

In addition, secondary batteries are cylindrical and prismatic batteries in which an electrode assembly is built into a cylindrical or square metal can, and a pouch-type battery in which the electrode assembly is built into a pouch-shaped case of an aluminum laminate sheet, depending on the shape of the battery case. Classified.

These secondary batteries may be used in the form of a single battery or in the form of a battery pack in which a plurality of unit cells are electrically connected, depending on the type of external device in which it is used. For example, a small device such as a mobile phone can operate for a predetermined time with the output and capacity of one battery, while in the case of a notebook computer, a small PC, etc., a number of cylindrical batteries are parallel and serialized due to the problem of output and capacity. The use of battery packs connected in a way is required.

In general, the cylindrical battery is more preferable than a prismatic or polymer battery in terms of capacity and output.

Therefore, in a battery pack used in a notebook computer, a small PC, etc., a protection circuit module (PCM) is connected to a battery cell array consisting of a plurality of cylindrical batteries connected in parallel or series. It consists of a structure mounted inside.

In this case, the battery cell arrangements are electrically connected to each other by welding connection members composed of metal plates to the electrode terminals of each of the battery cells.

However, in the welding process of the metal plate, since it is not easy to fix the arrangement of the battery cells, the metal plate is placed on the battery cell arrangement in a state in which the electrode terminals are arranged to be located in the upper surface direction. After that, there is a limitation that the welding process of the electrode terminals and the metal plate must be performed only by a vertical welding machine.

In addition, since it is not easy to fix the metal plate located on the battery cell array during the welding process, product defects increase during the welding process. , Since it is difficult to reuse this, there is a problem in that the entire metal plate and the battery cell must be discarded.

Therefore, there is a high need for a technology that can fundamentally solve this problem.

An object of the present invention is to solve the problems of the prior art and technical problems that have been requested from the past.

The inventors of the present application have undergone in-depth research and various experiments, and as will be described later, a connection member fixing part that is welded to the electrode terminals while the connection members are fixed by a rib for fixing the outer periphery and a magnetic member. By being configured to include, by the connection member fixing portion, since the welding can be performed in a state where the positions of each battery cell and the connection member are stably fixed, welding failure due to the flow of the electrode terminals and the connection member Can be eliminated or minimized, and it is possible to quickly perform welding of connection members to a plurality of battery cells at once, thus saving the cost and time required for the welding process, and Since welding can be performed in various directions while maintaining a stable fixed state, it has been confirmed that restrictions on the welding device and welding direction can be minimized, and the present invention has been completed.

Battery cell welding jig according to the present invention for achieving this purpose,

A base part in which a plurality of battery cells are seated on one surface so that the electrode terminals are arranged in the same direction;

A connection member fixing portion located at one outer periphery of the base portion in which the electrode terminals are arranged and the other outer periphery opposite to the outer periphery of the base portion, and to which connection members composed of metal plates electrically connecting the electrode terminals are fixed; And

A support portion formed on at least one outer periphery of the outer peripheries other than the outer periphery of the base portion where the connecting member fixing portion is located, and supporting the arrangement of the battery cells;

Contains,

The connecting member fixing part,

A rib for fixing the outer periphery which protrudes outward to surround the outer periphery of the connecting members, corresponding to the position and shape of each of the connecting members; And

A magnetic member positioned at a portion facing the connecting members so that the connecting members are fixed by magnetic force;

It may be a structure that includes.

Therefore, welding can be performed while the positions of the battery cells and the connecting members are stably fixed by the connecting member fixing part, thereby eliminating or minimizing welding defects due to the flow of the electrode terminals and the connecting members. It is possible to perform welding of the connecting members to a plurality of battery cells quickly at a time, saving the cost and time required for the welding process, and maintaining a stable fixed state of the battery cells and the connecting members. While maintaining, since welding can be performed in various directions, it is possible to minimize restrictions on the welding device and welding direction.

In one specific example, the connection member fixing part is a welder through which a welding rod for welding the connection member and the electrode terminal of the battery cell is inserted from an outer surface opposite to the connection member at a portion where the connection member is fixed. It may be a structure that has been made.

That is, when the connecting member fixing part is located at the electrode terminal area of the battery cells seated on the base part, the connecting member fixing part has a welding hole perforated in a through structure in the part where each connecting member is fixed, so that the welder By inserting the welding rod, it is possible to more easily perform welding of the connection member and the electrode terminal in a state in which the connection member is stably faced and fixed to the electrode terminal.

In addition, the magnetic member may have a structure positioned at a portion other than a portion to which the electrode terminal and the connection member of the battery cell are welded.

Therefore, the magnetic member maintains a stable coupling force by magnetic force with respect to the connection member made of a metal plate, and at the same time, in a state in which there is no interference with the insertion of the welding rod through the welder and the welding process by the welding rod, more stable welding This can be done.

In this case, the magnetic member may be mounted in a state exposed to the outside at a portion of the connection member fixing portion facing the connection member or may have a structure mounted inside.

More specifically, when the magnetic member is mounted in a state exposed to the outside at a portion of the connecting member fixing portion facing the connecting member, there is no factor to reduce the magnetic force between the connecting member, and thus the connecting member While maintaining a more stable fixed state of the magnetic member, it is easy to replace the magnetic member.

In addition, in the case of a structure in which the magnetic member is mounted at the portion of the connection member fixing portion facing the connection member, in the case of a structure mounted inside, a cleaner appearance can be formed at the portion of the connection member fixing portion facing the connection member. Accordingly, damage to the connection member due to direct contact between the magnetic member and the connection member can be minimized.

Meanwhile, the fixing rib may have a structure protruding outward at a height of 50% to 250% with respect to the thickness of the connection member.

If the height protruding outward of the fixing rib is too low outside the above range, it may not be possible to stably prevent the flow of the connecting member through the fixing rib, and on the contrary, the outward direction of the fixing rib If the protruding height is too high outside the above range, the outward protruding end of the fixing rib contacts the portion of the battery cell in which the electrode terminal is formed, so that the connection member and the electrode terminal may not be able to maintain a stable contact state. Accordingly, a defect may occur in welding of the connection member to the electrode terminal.

In one specific example, the connection member includes a voltage detection tab extending from an outer periphery of one side to detect voltages of battery cells to which the electrode terminals are connected;

The fixing rib may have a structure protruding outward so as to surround the rest of the outer periphery except for the voltage detecting tab.

Accordingly, the voltage detection tab may not be deformed or interfered with by the fixing ribs surrounding the outer periphery of the connecting member, and may more easily extend outward.

In addition, the connection member has a through hole for fixing at a central portion thereof;

The connection member fixing part may have a structure further including an auxiliary fixing rib protruding outward in a shape corresponding to the fixing through hole.

Therefore, the connection member is an auxiliary fixing rib that protrudes outward so as to be inserted into the fixing through-hole drilled in the center portion even if the fixing rib surrounding the outer periphery of the connection member is damaged or damaged during the welding process to the electrode terminal. As a result, it is possible to maintain a stable fixed state, thereby eliminating or minimizing defects in welding of the electrode terminal and the connection member.

In this case, the area of the through hole for fixing of the connecting member may be 5% to 15% of the area of the connecting member.

If the width of the through hole for fixing the connection member is too small outside the above range, it may not be possible to stably maintain the fixed state of the connection member by the auxiliary fixing rib. Conversely, for fixing the connection member When the area of the through hole is too large outside the above range, the area of the connection member becomes too small, and as resistance increases, the temperature at the connection member portion during operation of the battery module or the battery pack including the same increases, or Heat may be generated, and accordingly, a problem of deteriorating safety may be caused.

In addition, as long as the fixing through-hole and the auxiliary fixing rib do not reduce the structural stability of the connecting member and can maintain a stable fixing state of the connecting member by the auxiliary fixing rib, the structure is greatly limited. No, in detail, it may be formed in a circular, elliptical, or polygonal structure in a plane.

Meanwhile, the connection member fixing part may have a structure connected to the outer periphery of one side and the outer periphery of the other side of the base in a hinge structure.

Accordingly, the connecting member fixing portion is spread in a state in which one outer periphery and the other outer periphery of the base portion are connected, so that a plurality of battery cells can be more easily seated on one surface of the base portion. In the fixed state, by bending in the direction of one surface of the base part around one outer periphery and the other outer periphery of the base part, it is possible to more easily position and fix each of the connecting members with respect to the electrode terminals of the battery cells. .

In one specific example, the support portion may be formed of a partition wall structure in which at least one outer peripheral portion protrudes upward from one surface of the base portion among other outer peripheries other than the outer periphery of the base portion where the connecting member fixing portion is located.

Accordingly, the support part may more easily support a plurality of battery cells seated on one side of the base part.

In this case, the support may have a structure including a fastening part for fastening to the outer periphery of the adjacent connecting member fixing part so as to fix the connection member fixing part while the connection member is connected to the electrode terminals of the battery cells.

Therefore, in a state in which the connecting members are fixed to the connecting member fixing part, when the connecting member fixing part is bent in the direction of one surface of the base part around the outer periphery connected to the base part in a hinge structure, the connecting member fixing part By being fastened to and fixed to the fastening part for fixing the support part protruding upward from the base part, it is possible to prevent the flow of the battery cells seated on the base part, and at the same time maintain a stable contact state between the battery cells and the connection members, and the connection members In the welding process of the and electrode terminals, it is possible to effectively prevent welding defects that may occur due to the spreading of the connecting member fixing portion.

In addition, there may be a structure in which a mounting groove recessed in a structure corresponding to an outer surface of the battery cells is formed on one surface of the base portion on which the battery cells are mounted.

Accordingly, since the battery cells are more stably seated on one surface of the base portion, welding of the electrode terminals and the connection members can be performed in a state in which the flow is prevented.

Meanwhile, the battery cell may be a cylindrical battery cell formed at a portion where the positive terminal and the negative terminal face each other.

That is, since the battery cell welding jig according to the present invention can perform welding of electrode terminals and connecting members in a state in which battery cells having a structure that does not include a flat outer surface such as a cylindrical battery cell are easily fixed, In particular, it can exert an excellent effect.

In addition, at least one of the connecting members may have a structure different from that of the other connecting members.

More specifically, the battery cells may be connected in series or in parallel by connection members.

At this time, at least one of the connecting members has a structure having a different shape from the other connecting members, and the outer periphery fixing rib may also protrude outward in a shape corresponding to each of the connecting members, and accordingly, the The battery cell welding jig can be applied more easily, regardless of the number of battery cells electrically connected by connection members and the electrical connection structure.

As described above, the battery cell welding jig according to the present invention is configured to include a connection member fixing portion that is welded to the electrode terminals in a state in which the connection members are fixed by the outer circumferential fixing rib and the magnetic member, By the connection member fixing part, welding can be performed while the positions of the battery cells and the connection members are stably fixed, so that welding defects due to the flow of the electrode terminals and the connection members can be eliminated or minimized. And, it is possible to quickly perform welding of the connecting members to a plurality of battery cells at once, saving the cost and time required for the welding process, and maintaining a stable fixed state of the battery cells and the connecting members. , Since welding can be performed in various directions, there is an effect of minimizing restrictions on the welding device and the welding direction.

1 is a schematic diagram schematically showing the structure of a battery cell welding jig according to an embodiment of the present invention;
Fig. 2 is a schematic diagram showing an enlarged structure of a connecting member fixing part of Fig. 1;
3 is a schematic view schematically showing the structure of the battery cell welding jig of FIG. 1 as viewed from the direction A;
4 is a schematic view schematically showing the structure of a battery cell welding jig according to another embodiment of the present invention;
5 is a schematic view showing an enlarged structure of the connection member fixing portion of FIG. 4.

Hereinafter, the present invention will be described in more detail with reference to the drawings according to an embodiment of the present invention, but the scope of the present invention is not limited thereto.

1 is a schematic diagram schematically showing the structure of a battery cell welding jig according to an embodiment of the present invention.

Referring to FIG. 1, the battery cell welding jig 100 includes a base part 110, connection member fixing parts 120 and 130, and a support part 140.

In the base unit 110, the electrode terminals 102 of the cylindrical battery cell 101 are arranged and seated so as to be positioned in the upper outer periphery direction, and the connection member fixing portions respectively on the upper outer periphery and the lower outer periphery of the base portion 110 Fields 120 and 130 are located.

The support part 140 is formed on the left outer periphery of the base part 110 to support the arrangement of the battery cells 101.

2 is a schematic diagram showing an enlarged view of the structure of the connecting member fixing portion of FIG. 1, and FIG. 3 is a schematic diagram showing the structure of the battery cell welding jig of FIG. 1 viewed from the direction A.

Referring to FIGS. 2 and 3 together with FIG. 1, the connecting member fixing part 120 has the remaining outer periphery except for the voltage detecting rib 104 of the connecting member 103 corresponding to the shape of the connecting member 103. To wrap around, the outer periphery fixing rib 121 protrudes outward.

A welder 122 into which a welding rod is inserted from the outside is perforated in a portion corresponding to the electrode terminal 102 of the battery cell 101 on the inside of the outer circumferential fixing rib 121, and a metal between the welders 122 A magnetic member 123 for fixing the connection member 103 made of a plate by magnetic force is mounted in a state exposed to the outside.

The connecting member fixing portions 120 and 130 located on the outer peripheries of both sides of the base portion 110 are connected to the outer peripheries of both sides of the base portion 110 by hinge structures 105 and 106, respectively.

Therefore, the connection member 103 fixed to the connection member fixing parts 120 and 130 is each battery cell 101 when the connection member fixing parts 120 and 130 are bent in the direction of the battery cell 101 The state of stably contacting the electrode terminal 102 of the can be maintained, and accordingly, the welding process of the electrode terminal 102 and the connection member 103 can be performed more easily.

The support part 140 has a partition wall structure protruding upward from the upper surface of the base part 110 so as to stably support the arrangement of the battery cells 101.

4 is a schematic diagram schematically showing the structure of a battery cell welding jig according to another embodiment of the present invention, and FIG. 5 is a schematic diagram showing an enlarged view of the connection member fixing portion structure of FIG. 4.

Referring to FIGS. 4 and 5 together, a fixing through hole 406 having a rectangular structure is perforated in a central portion of the connection member 402.

In the portion of the connection member fixing portion 420 corresponding to the fixing through hole 406 of the connection member 402, an auxiliary fixing rib 424 having a planar quadrangular structure corresponding to the fixing through hole 406 Is protruding outward.

Therefore, even if the outer circumferential fixing rib 421 is damaged, the auxiliary fixing rib 424 can maintain the fixed state of the connecting member 402 more stably.

The magnetic member 423 is mounted inside, between the welders 422 drilled so that the welding rod is inserted.

Accordingly, damage to the connection member 402 due to direct contact with the magnetic member 423 can be prevented.

Structures other than the above structure are the same as those of the battery cell welding jig of FIG. 1 and the connection member fixing part of FIG. 2, and thus detailed descriptions thereof will be omitted.

Claims (14)

A base part in which a plurality of battery cells are mounted on one surface so that the electrode terminals are arranged in the same direction;
A connection member fixing portion located on one outer periphery of the base portion in which the electrode terminals are arranged and the other outer periphery opposite to the outer periphery of the base portion, and to which connection members composed of metal plates electrically connecting the electrode terminals are fixed; And
Includes; a support portion formed on at least one outer periphery of the rest of the outer peripheries other than the outer periphery of the base portion where the connecting member fixing portion is located, and supporting the arrangement of the battery cells
The connecting member fixing part,
A plurality of outer periphery fixing ribs protruding outward so as to surround the outer periphery of each of the connecting members, corresponding to the position and shape of each of the connecting members;
A plurality of welders formed by perforating inside each of the outer peripheral fixing ribs so that the welding rod can be inserted into a portion corresponding to the electrode terminal of the battery cell; And
A battery cell welding jig comprising: a plurality of magnetic members positioned at a portion facing each of the connecting members and spaced apart from the welders so that each of the connecting members can be fixed by magnetic force. delete delete The battery cell welding jig according to claim 1, wherein the magnetic member is mounted in a state exposed to the outside at a portion of the connection member fixing portion facing the connection member or mounted inside. The battery cell welding jig according to claim 1, wherein the fixing rib protrudes outward at a height of 50% to 250% with respect to the thickness of the connection member. The method of claim 1,
The connection member includes a voltage detection tab extending from an outer periphery of one side to detect voltages of battery cells to which the electrode terminals are connected;
The fixing rib is a battery cell welding jig, characterized in that protruding outward so as to surround the rest of the outer periphery except for the voltage detection tab. The method of claim 1,
The connecting member has a fixing through hole perforated in a central portion thereof;
A battery cell welding jig, wherein the connecting member fixing part further comprises an auxiliary fixing rib protruding outward in a shape corresponding to the fixing through hole. The battery cell welding jig according to claim 7, wherein the fixing through-hole and the auxiliary fixing rib have a circular, elliptical, or polygonal structure in plan view. The battery cell welding jig according to claim 1, wherein the connecting member fixing part is connected to one outer periphery and the other outer periphery of the base portion in a hinge structure. The method of claim 1, wherein the support part is formed of a partition wall structure in which at least one outer circumference portion protrudes upward from one surface of the base part among the remaining outer circumferences excluding the outer circumference of the base part where the connection member fixing part is located. Battery cell welding jig. 11. The method of claim 10, wherein the support part comprises a fastening part for fastening to the outer periphery of the adjacent connecting member fixing part so as to fix the connection member fixing part in a state in which the connection member is connected to the electrode terminals of the battery cells. Battery cell welding jig. The battery cell welding jig according to claim 1, wherein a seating groove recessed in a structure corresponding to an outer surface of the battery cells is formed on one surface of the base portion on which the battery cells are seated. The battery cell welding jig according to claim 1, wherein the battery cell is a cylindrical battery cell formed at a portion where the positive terminal and the negative terminal face each other. The battery cell welding jig according to claim 1, wherein at least one of the connecting members has a different shape from the other connecting members.

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