KR102213902B1 - Assembly method of 4-serial battery pack unit - Google Patents

Abstract

Disclosed is a method for assembling a 4-serial battery pack unit to prevent a contact defect between a PCB assembly and lithium batteries. According to the present invention, the method comprises the following steps: spot-welding each of upper electrode connection members connected to the upper side of a PCB to the positive polarity of each of a first unit battery, a second unit battery, a third unit battery, and a fourth unit battery; spot-welding each of lower electrode connection members connected to the lower side of the PCB to the negative polarity of each of the first to fourth unit batteries; and arranging the PCB, the upper electrode connection member, the lower electrode connection member, and the first to fourth unit batteries spot-welded to the upper and lower electrode connection members in a storage case.

Description

Assembly method of 4 series battery pack device{ ASSEMBLY METHOD OF 4-SERIAL BATTERY PACK UNIT}

The present invention relates to a method of assembling a four-series battery pack device, and more particularly, to a method of assembling a four-series battery pack device capable of blocking contact failure between a PCB assembly and lithium batteries.

Recently, compact and lightweight electric/electronic devices such as portable computers have been actively developed and produced. These portable electric/electronic devices have built-in battery packs so that they can be operated even in places where a separate power source is not provided. The built-in battery pack has a form in which at least one or more bare battery cells are connected to each other to be packaged so as to output a voltage of a predetermined level to drive the portable electric/electronic device for a predetermined period.

On the other hand, lithium (lithium thionyl or Li/SOCl2) batteries used as lithium batteries are recently commercialized and mainly used not only for military power supplies but also for civilians because of their high power, high capacity, excellent low temperature characteristics, and excellent energy density per weight.

The lithium primary battery can carry various products as electronic products are miniaturized, and portable electronic products are used as power sources.

The advantage of lithium primary batteries is that they can be used for a long time due to their large capacity. It is also lighter than other batteries. However, it has been pointed out as a problem that it is more dangerous than other batteries, and it is difficult to make a high power pack battery capable of passing a high current due to safety issues.

Therefore, in order to maintain battery performance and safety, a protection circuit that is not used in other batteries is used. The lithium battery pack refers to a structure in which a plurality of series-connected bare battery cells (or unit cells) and pack electrodes are connected by a protection circuit.

When a large-capacity battery pack is formed by connecting a plurality of lithium primary batteries in series, excessive discharge or forced over-discharge of the battery pack may occur due to an internal short circuit as the battery cell (or unit battery) is completely discharged. There is a problem that leads to a possible explosion hazard.

In order to block such excessive discharge, the above-described protection circuit is provided to block the above-described discharge operation before excessive discharge occurs.

0001) Korean Patent Registration No. 10-1034035 (2011. 05. 02.) (Battery pack circuit and protection method of battery pack using the same) 0002) Korea Open Utility Model No. 20-2010-0000095 (2010. 01. 06.) (Residual capacity indication lithium primary battery pack)

Accordingly, the technical problem of the present invention is focused on this point, and an object of the present invention is to prevent contact failure between the PCB assembly and the lithium battery by placing it in the storage case after connecting the lithium battery and the PCB assembly by spot welding. It is to provide a method of assembling a series battery pack device.

In order to realize the object of the present invention, a method of assembling a four-series battery pack device according to an embodiment includes each of the upper electrode connecting members connected to the upper side of the PCB substrate, the first unit cell, the second unit cell, and the second unit cell. Spot welding the positive polarity of each of the 3 unit cells and the fourth unit cells; Spot welding each of the lower electrode connecting members connected to the lower side of the PCB substrate and the negative polarity of each of the first to fourth unit cells; And disposing the first to fourth unit cells spot-welded to the PCB substrate, the upper electrode connecting member, the lower electrode connecting member, and the upper and lower electrode connecting members in the storage case.

In order to realize another object of the present invention, a method of assembling a four-series battery pack device according to another embodiment includes each of the upper electrode connecting members connected to the upper side of the PCB substrate, a first unit cell, a second unit cell, Spot welding the positive polarity of each of the third and fourth unit cells; Inserting the first to fourth unit cells spot-welded to the PCB substrate, the upper electrode connecting member, the lower electrode connecting member, and the upper and lower electrode connecting members into a storage case; And spot welding each of the lower electrode connecting members connected to the lower side of the PCB substrate and the negative polarity of each of the first to fourth unit cells.

In one embodiment, inspecting a complete discharge operation while the PCB substrate, the upper and lower electrode connecting members, and the first to fourth unit cells are disposed in the storage case; Coupling a storage cover to the storage case; Removing a fuse and a connector to the outside through a hole formed in the storage cover and organizing it; And it may further include the step of assembling the fuse box cover.

According to this method of assembling a 4-series battery pack device, a contact failure between the PCB assembly and the lithium battery can be prevented by connecting the lithium batteries and the PCB assembly by spot welding and then placing them in the storage case. That is, by spot welding the upper electrode connection member and the lower electrode connection member connected to the PCB assembly to each of the positive and negative polarities of lithium batteries and then placing them in the storage case, it is possible to block the contact failure between the PCB assembly and lithium batteries. .

1 is an exploded perspective view illustrating a four-series battery pack apparatus according to an embodiment of the present invention.
2 is a plan view illustrating the PCB assembly shown in FIG. 1.
3 is a block diagram illustrating a protection circuit of the four-series battery pack device shown in FIG. 1.
4 are photographs illustrating a method of assembling a four-series battery pack device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the present invention, various modifications can be made and various forms can be obtained, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form of disclosure, it is to be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each drawing, similar reference numerals have been used for similar elements. In the accompanying drawings, the dimensions of the structures are shown to be enlarged compared to the actual size for clarity of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance the possibility of being added.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

1 is an exploded perspective view illustrating a four-series battery pack apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a four-series battery pack device according to an embodiment of the present invention includes lithium batteries 110, a PCB assembly 120, a storage case 130, and a storage cover 140. In this embodiment, the lithium batteries 110 are all lithium primary batteries.

The lithium batteries 110 include a first unit cell 112, a second unit cell 114, a third unit cell 116, and a fourth unit cell 118. The first unit cell 112 and the second unit cell 114 are disposed close to the PCB assembly 120, and the third unit cell 116 and the fourth unit cell 118 are disposed away from the PCB assembly 120. do. In FIG. 1, the first to fourth unit cells 118 are shown to be cylindrical batteries, but various shapes such as square column batteries are possible.

The PCB assembly 120 is disposed to surround the lithium batteries 110 and receives power from the lithium batteries 110 and supplies them to an external device. The PCB assembly 120 may be equipped with a protection circuit that blocks current output at the end of discharge in order to prevent a risk of battery explosion due to overdischarge or complete discharge. In addition, the PCB assembly 120 may be provided with a wire (not shown) and a connector (not shown) to supply power to an external device.

Specifically, the PCB assembly 120 includes a PCB board 122, an upper electrode connection member 124 connected to the PCB board 122, and a lower electrode connection member 126 connected to the PCB board 122.

The PCB substrate 122 has a height corresponding to the height of the lithium batteries 110 and a width corresponding to twice the diameter of the battery. The PCB substrate 122 is disposed adjacent to the side of the lithium battery 110. That is, the PCB substrate 122 is disposed vertically, that is, parallel to the Z-axis.

The upper electrode connecting member 124 is connected to the upper side of the PCB substrate 122 and bent in the first direction (ie, in the X-axis direction), so that the first to fourth unit cells 112, 114, 116, 118 ) It is electrically connected to each positive polarity by spot welding. The upper electrode connecting member 124 includes a flexible conductive material, and the upper electrode connecting member 124 is spot-welded to the positive polarities of the first to fourth unit cells 112, 114, 116, and 118.

The upper electrode connecting member 124 includes a first electrode connecting member 124a, a second electrode connecting member 124b, a third electrode connecting member 124c, and a fourth electrode connecting member 124d.

Specifically, the first electrode connection member 124a has an I-shape, is connected to the upper side of the PCB substrate 122, is bent in the first direction, and is formed to the positive polarity of the first unit cell 112 through the end portion. It is electrically connected by spot welding.

The second electrode connecting member 124b has an I-shape, is connected to the upper side of the PCB substrate 122, is bent in the first direction, and is spot-welded to the positive polarity of the second unit cell 114 through the end portion. Is electrically connected.

The third electrode connecting member 124c has an L-shape, is connected to the upper side of the PCB substrate 122, is bent in a first direction (for example, in the X-axis direction), and then in the first direction at the end. It is bent in a second direction (eg, Y-axis direction) perpendicular to and is electrically connected to the positive polarity of the third unit cell 116 through a terminal portion by a spot welding method.

The fourth electrode connection member 124d has an L-shape, is connected to the upper side of the PCB substrate 122, is bent in the first direction, and is then in a third direction opposite to the second direction at the end (for example, , -Y-axis direction) is bent and electrically connected to the positive polarity of the fourth unit cell 118 through an end portion by a spot welding method.

The upper electrode connecting member 124 includes a part of the first electrode connecting member 124a, a part of the second electrode connecting member 124b, a part of the third electrode connecting member 124c, and the fourth electrode connecting member 124d. A first taping member 125 attached to a portion may be further included. Accordingly, it is possible to solve a problem in which the first to fourth electrode connecting members 124a, 124b, 124c, and 124d are in parallel with each other and are in electrical contact with each other. In this embodiment, each of the first to fourth electrode connecting members 124a, 124b, 124c, and 124d exposed because the first taping member 125 is not attached is the first to fourth unit cells through spot welding. It is welded to the positive polarity of (112, 114, 116, 118).

The lower electrode connecting member 126 is connected to the lower side of the PCB substrate 122 and bent in the first direction, and spot welding the negative polarities of the first to fourth unit cells 112, 114, 116, 118 Electrically connected in a way. The lower electrode connecting member 126 includes a flexible conductive material, and the lower electrode connecting member 126 is spot-welded to the negative polarities of the first to fourth unit cells 112, 114, 116, and 118.

The lower electrode connecting member 126 includes a fifth electrode connecting member 126a, a sixth electrode connecting member 126b, a seventh electrode connecting member 126c, and an eighth electrode connecting member 126d.

Specifically, the fifth electrode connection member 126a has an I-shape, is connected to the lower side of the PCB substrate 122, is bent in a first direction (eg, X-axis direction), 1 It is electrically connected to the negative polarity of the unit cell 112 by a spot welding method.

The sixth electrode connection member 126b has an I-shape, is connected to the lower side of the PCB substrate 122, is bent in the first direction, and is spot-welded to the negative polarity of the second unit cell 114 through the end portion. Is electrically connected.

The seventh electrode connecting member 126c has an L-shape, is connected to the lower side of the PCB substrate 122, is bent in the first direction, and is perpendicular to the first direction (ie, the X-axis direction) at the end. It is bent in one second direction (for example, in the Y-axis direction) and is electrically connected to the negative polarity of the third unit cell 116 through a terminal portion through a spot welding method.

The eighth electrode connection member 126d has an L-shape, is connected to the lower side of the PCB substrate 122, is bent in the first direction, and is then in a third direction opposite to the second direction at the end (for example, , -Y-axis direction) is bent and electrically connected to the negative polarity of the fourth unit cell 118 through a terminal portion through a spot welding method.

As such, the PCB substrate 122 corresponds to the side portion of the lithium battery type 110, the upper electrode connecting member 124 corresponds to the upper portion of the lithium battery type 110, and the lower electrode connecting member 126 is a lithium battery type ( Since it corresponds to the lower part of 110), the lithium batteries 110 as a whole have a shape surrounded by the PCB assembly 120 and are disposed inside the storage case 130.

The storage case 130 has a rectangular box shape and houses the lithium batteries 110 and the PCB assembly 120.

The storage cover 140 has a square shape and covers the upper portion of the storage case 130. A hole (not shown) for drawing out an electric wire (not shown) or a connector (not shown) provided in the PCB assembly 120 may be formed in the storage cover 140.

The lower electrode connection member 126 includes a part of the fifth electrode connection member 126a, a part of the sixth electrode connection member 126b, a part of the seventh electrode connection member 126c, and the eighth electrode connection member 126d. A second taping member 127 attached to a portion may be further included. Accordingly, it is possible to solve a problem in which the fifth to eighth electrode connecting members 126a, 126b, 126c, and 126d are in parallel with each other and are in electrical contact with each other. In this embodiment, each of the fifth to eighth electrode connecting members 126a, 126b, 126c, and 126d exposed because the second taping member 127 is not attached to the first to fourth unit cells It is welded to the negative polarity of (112, 114, 116, 118).

As described above, by connecting the lithium batteries 110 and the PCB assembly 120 by spot welding and then placing them in the storage case, a contact failure between the PCB assembly and the lithium batteries 110 can be completely blocked. That is, the upper electrode connection member 124 and the lower electrode connection member 126 connected to the PCB assembly 120 are connected to each of the positive and negative polarities of the lithium batteries 110 by spot welding, and then to the storage case 130. By arranging, it is possible to completely block a contact failure between the PCB assembly 120 and the lithium batteries 110.

3 is a block diagram illustrating a protection circuit of the four-series battery pack device shown in FIG. 1. The protection circuit of the four-series battery pack device is mounted on a PCB substrate.

Referring to FIG. 3, the protection circuit of the 4-series battery pack device includes a discharge blocking device 310, a diode 320, a thermal switch 330, a fuse 340, a discard switch 350, a blocking capacitor 360, and Including an initialization switch 370, it is connected between the unit cells and an external load, and when the voltage output from the lithium battery is a voltage at the end of discharge, the current is blocked to prevent an explosion risk that may occur due to complete discharge. .

The discharge blocking device 310 blocks the output current when the voltage of each of the unit cells is less than the reference voltage, that is, the over-discharge voltage when the 4-series battery pack is discharged.

The diode 320 includes an anode connected to an output terminal of the discharge blocking device 310 and a cathode connected to a load side, and blocks an input current and an input voltage introduced from the load side.

The thermal switch 330 is connected to the cathode of the diode 320 to block the transmission path between the unit cell and the load when the internal temperature of the 4-series battery pack rises above a certain temperature. The thermal switch 330 may be a positive temperature coefficient device (PTC) or a thermal fuse.

The fuse 340 is connected in series to the thermal switch 330 to cut off the output when the current exceeds the current threshold when the 4 series battery pack is discharged.

The disposal switch 350 is connected between the positive and negative polarities of the unit cell and is used as a complete discharge circuit to discard the battery pack after use. Additionally, a light emitting diode and a resistor connected in parallel thereto may be included between the waste switch 350 and the negative polarity of the unit cell.

The blocking capacitor 360 delays the blocking time for a predetermined period of time to prevent a transient minimum voltage (TMV) phenomenon during initial discharge of the 4-series battery pack.

The initialization switch 370 is connected to both ends of the discharge blocking device 310 to initialize the protection circuit of the 4-series battery pack device. In general, lithium lithium batteries have the advantage of having a high voltage, a wide usable temperature range, and can be used even after being stored for a long time, and can be used for a much longer time than other batteries due to their high energy density. However, since lithium lithium batteries use a metal having a very high energy density, such as lithium, as an electrode material, unlike manganese batteries or Alarane batteries, which are generally used, unexpected accidents may occur if used incorrectly. In particular, a lithium battery is installed in a used device, and the battery explodes due to complete discharge due to excessive use during use, which may cause not only loss of the corresponding device, but also a risk to the user.

However, by adopting the protection circuit according to the present invention, the current output is blocked at the end of discharge, thereby preventing the risk of battery explosion due to overdischarge or complete discharge.

4 are photographs illustrating a method of assembling a four-series battery pack device according to an embodiment of the present invention.

Referring to FIG. 4, the cover assembly and the first to fourth unit cells are electrically connected by spot welding (step S110). That is, each of the lower electrode connecting members connected to the lower side of the PCB substrate and the negative polarity of each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell are spot-welded. In addition, each of the upper electrode connecting members connected to the upper side of the PCB substrate and the positive polarity of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell are connected by spot welding.

Then, the cover assembly, each of the lower electrode connecting members connected to the negative polarity of the first to fourth unit cells by a spot welding method, and each of the upper electrode connecting members connected to the positive polarity of the first to fourth unit cells by a spot welding method. Is inserted into the storage case (step S120). Accordingly, the first to fourth unit cells and the PCB substrate electrically connected to the first to fourth unit cells through a spot welding method are disposed inside the storage case.

Then, the complete discharge operation of the four-series battery pack device is checked (step S130).

Then, the storage cover is coupled to the storage case (step S140).

Subsequently, the fuse and the connector are drawn out through the hole formed in the storage cover to be arranged (step S150).

Then, the fuse box cover is assembled to the storage cover so that the fuse and connector are not leaked to the outside to complete the finished product of the 4-series battery pack device (step S160).

In the above, after spot welding the negative polarity of each of the lower electrode connecting members and the unit cells, spot welding the positive polarity of each of the upper electrode connecting members and the unit cells has been described. After spot welding the positive polarity, each of the lower electrode connecting members and the negative polarity of the unit cells may be spot-welded.

In addition, it has been described that the negative polarity of each of the lower electrode connecting members and the unit cells is spot-welded and the positive polarity of each of the upper electrode connecting members and the unit cells is spot-welded and then placed in the storage case, but each of the lower electrode connecting members After spot-welding the negative polarities of the unit cells and the storage case, each of the upper electrode connecting members and the positive polarities of the unit cells may be spot-welded.

Although the above has been described with reference to examples, it is understood that those skilled in the art may variously modify and change the present invention without departing from the spirit and scope of the present invention described in the following claims. You can understand.

110: lithium batteries 112: first unit battery
114: second unit cell 116: third unit cell
118: fourth unit cell 120: PCB assembly
122: PCB board 124: upper electrode connecting member
124a: first electrode connecting member 124b: second electrode connecting member
124c: third electrode connecting member 124d: fourth electrode connecting member
125: first taping member 126: lower electrode connecting member
126a: fifth electrode connecting member 126b: sixth electrode connecting member
126c: seventh electrode connecting member 126d: eighth electrode connecting member
127: second taping member 130: storage case
140: storage cover 310: discharge blocking device
320: diode 330: thermal switch
340: fuse 350: discard switch
360: blocking capacitor 370: initialization switch

Claims (2)

Spot welding each of the upper electrode connecting members connected to the upper side of the PCB substrate and the positive polarity of each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell;
Spot welding each of the lower electrode connecting members connected to the lower side of the PCB substrate and the negative polarity of each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell;
Disposing the first to fourth unit cells spot-welded to the PCB substrate, the upper electrode connection member, the lower electrode connection member, and the upper and lower electrode connection members in a storage case;
Inspecting a complete discharge operation while the PCB substrate, the upper and lower electrode connecting members, and the first to fourth unit cells are disposed in the storage case;
Coupling a storage cover to the storage case;
Removing a fuse and a connector to the outside through a hole formed in the storage cover to organize it; And
Assembly method of a four-series battery pack device comprising the step of assembling a fuse box cover. Spot welding each of the lower electrode connecting members connected to the lower side of the PCB substrate and the negative polarity of each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell;
Inserting the first to fourth unit cells spot-welded to the PCB substrate, the lower electrode connection member, and the lower electrode connection members into a storage case;
Spot welding each of the upper electrode connecting members connected to the upper side of the PCB substrate and the positive polarity of each of the first unit cell, the second unit cell, the third unit cell, and the fourth unit cell;
Inspecting a complete discharge operation while the PCB substrate, the upper and lower electrode connecting members, and the first to fourth unit cells are disposed in the storage case;
Coupling a storage cover to the storage case;
Removing a fuse and a connector to the outside through a hole formed in the storage cover and organizing it; And
Assembly method of a four-series battery pack device comprising the step of assembling the fuse box cover.

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