KR20210110919A - Battery module having a structure in which a terminal part of pcb and a bus bar are directly connected - Google Patents

Abstract

The present invention relates to a battery module in which a terminal part of a printed circuit board and a bus bar are directly connected. The battery module includes a bus bar including a junction part for bonding to an electrode lead of a battery cell assembly and a protrusion part for coupling to the printed circuit board for voltage sensing, wherein a through-hole formed in the terminal part of the printed circuit board and the protrusion part of the bus bar are soldered in a state in which they are fastened. The present invention provides the battery module having the structure in which occurrence of defective rate is alleviated in an assembly process of the battery module.

Description

BATTERY MODULE HAVING A STRUCTURE IN WHICH A TERMINAL PART OF PCB AND A BUS BAR ARE DIRECTLY CONNECTED}

The present invention relates to a battery module having a structure in which a terminal part of a printed circuit board and a bus bar are directly fastened.

Recently, an increase in the price of an energy source due to the depletion of fossil fuels, interest in environmental pollution is amplified, and the demand for an eco-friendly alternative energy source is becoming 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 power storage devices for using the generated energy more efficiently are also of great interest.

In particular, as technology development and demand for mobile devices increase, the demand for batteries as an energy source is rapidly increasing. In addition, the range of use is also expanding to the use of power auxiliary power through grid formation, and accordingly, a lot of research on batteries that can meet various needs is being conducted.

On the other hand, small mobile devices use one or two or three battery cells per device, whereas medium and large devices such as automobiles have a need for high output and large capacity, a battery pack including a battery module electrically connecting a plurality of battery cells this is used

Such a battery module includes a bus bar to electrically connect a plurality of battery cells, and a printed circuit board (PCB) is used to sense voltages of the plurality of battery cells.

1 is a schematic diagram showing a coupling structure of a bus bar and a printed circuit board in a conventional battery module.

1, in the conventional battery module 10, a positive electrode lead 11 formed from a positive electrode and a negative electrode lead 12 formed from a negative electrode are bonded to a bus bar 13, and one side of the bus bar 13 is It has a structure in which the printed circuit board 14 is connected. The printed circuit board 14 is bonded to the bus bar 13 by welding. Specifically, in the printed circuit board 14, a crimping part 15 is formed at the connection portion of the bus bar 13, and the crimping part (15) is compressed and deformed to achieve mechanical fastening with respect to the bus bar (13). In addition, a welding plate 16 to which the crimping part 15 is adhered is formed on the bus bar 13 , and the crimping part 15 and the bus bar 13 are welded and fixed through a laser or the like.

However, when the laser welding process is applied in the process of fastening the printed circuit board and the bus bar, there is a disadvantage in that it is inefficient due to a high defect rate and unit cost.

Therefore, it is necessary to develop a technology capable of solving these problems.

Korean Patent Publication No. 10-2019-0124022

The present invention was devised to solve the above problems, and an object of the present invention is to provide a battery module having a structure in which the defect rate is alleviated and processability is improved during the assembly process of the battery module.

In one example, a battery module according to the present invention includes a battery cell assembly in which a plurality of battery cells are stacked including electrode leads extending from electrode tabs of each battery cell; a printed circuit board for voltage sensing that measures the voltage of the battery cells included in the battery cell assembly; a bus bar electrically connecting the battery cell assembly and the printed circuit board for voltage sensing, the bus bar including a junction part for bonding to an electrode lead of the battery cell assembly and a protrusion part for coupling with the printed circuit board for voltage sensing; The printed circuit board for voltage sensing includes a terminal portion having a through hole coupled to the bus bar, and the voltage sensing printed circuit board and the bus bar include a state in which the terminal portion is coupled with a through hole and a protrusion of the bus bar. It is a structure that is soldered with

In a specific example, the terminal portion of the printed circuit board for voltage sensing, a plate-shaped metal layer; and an insulating layer having a structure surrounding the metal layer. Including, but the metal layer is exposed on the inner peripheral surface of the through hole formed in the terminal portion.

In a specific example, the protrusion of the bus bar has a structure in which a boundary between the protrusion and the through-hole formed in the terminal unit is soldered while being inserted into the through-hole formed in the terminal unit.

In a specific example, the protrusion has a circular, oval, or polygonal shape based on a horizontal cross section.

In a specific example, the through hole has a shape corresponding to the protrusion of the bus bar.

In another example, the angle between the outer peripheral surface of the protrusion and the bus bar is 90 degrees to 120 degrees.

In another example, the height of the protrusion is greater than the sum of the thicknesses of the insulating layer and the metal layer.

In another example, the height of the protrusion is equal to the sum of the thicknesses of the insulating layer and the metal layer.

In a specific example, the bus bar has a plate-shaped structure, the joint portion is formed in a predetermined area of the bus bar, and the protrusion is formed outside the area where the joint portion is formed.

In one example, n bus bars are included (n is an integer greater than or equal to 2), and n voltage detection members are drawn from the printed circuit board and connected to each bus bar.

In another example, the number of bus bars includes n (n is an integer greater than or equal to 2), and the voltage detection member includes a main line drawn from a printed circuit board and n branch lines connected thereto, and each branch line This structure is connected to each busbar.

In one example, the battery module according to the present invention further includes a bus bar frame mounted between the bus bar and the battery cell assembly, the bus bar receiving part having a recessed shape so that the bus bar is seated; and a slit through which the electrode lead can pass. includes

In one example, the electrode leads are formed at both ends of the battery cell, and a bus bar and a bus bar frame connecting the electrode leads are mounted on one surface and the opposite surface of the battery cell assembly, The bus bars mounted on one surface and the opposite surface are connected by a printed circuit board and a terminal unit.

In a specific example, the battery module according to the present invention further includes a connector connected to the printed circuit board and transmitting the detected voltage to a Battery Management System (BMS).

The present invention also provides a battery pack, the battery pack comprising: a battery pack case including a tray and a pack cover; and a plurality of battery modules accommodated in the battery pack case; Including, the battery module is as described above.

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

The battery module according to the present invention can provide a battery module having a structure in which the defect rate is alleviated and fairness is improved in the assembly process of the battery module by directly fastening the terminal part of the printed circuit board and the bus bar through the fastening between the protrusion and the through hole. have.

1 is a schematic diagram showing a coupling structure of a bus bar and a printed circuit board in a conventional battery module.
2 is a perspective view of a battery module according to an embodiment of the present invention.
3 is an exploded perspective view of a battery module according to an embodiment of the present invention.
4 is a schematic diagram illustrating a coupling structure of a terminal unit and a bus bar according to an embodiment of the present invention.
5 is an enlarged view of an enlarged portion A of FIG. 4 .
6 is a schematic diagram illustrating a vertical cross-section of a bus bar and a terminal part according to an embodiment of the present invention.
7 is a schematic diagram illustrating a vertical cross-section of a bus bar and a terminal part according to another embodiment of the present invention.
8 is a schematic diagram illustrating a vertical cross-section of a bus bar and a terminal part according to another embodiment of the present invention.
9 is a block diagram illustrating a connection form between a printed circuit board and a bus bar according to an embodiment of the present invention.
10 is a block diagram illustrating a connection form between a printed circuit board and a bus bar according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail. Prior to this, the terms or words used in the present specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventor must properly understand the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined in

In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof. Also, when a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where it is "directly on" another part, but also the case where another part is in the middle. Conversely, when a part of a layer, film, region, plate, etc. is said to be “under” another part, this includes not only cases where it is “directly under” another part, but also cases where another part is in between. In addition, in the present application, “on” may include the case of being disposed not only on the upper part but also on the lower part.

Hereinafter, the battery module according to the present invention will be described in detail.

In one example, the battery module according to the present invention includes a battery cell assembly in which a plurality of battery cells including an electrode lead extending from the electrode tabs of each battery cell are stacked; a printed circuit board for voltage sensing that measures the voltage of the battery cells included in the battery cell assembly; a bus bar electrically connecting the battery cell assembly and the printed circuit board for voltage sensing, the bus bar including a junction part for bonding to an electrode lead of the battery cell assembly and a protrusion part for coupling with the printed circuit board for voltage sensing; The printed circuit board for voltage sensing includes a terminal portion having a through hole coupled to the bus bar, and the voltage sensing printed circuit board and the bus bar include a state in which the terminal portion is coupled with a through hole and a protrusion of the bus bar. It is a structure that is fixed to soldering.

At this time, the printed circuit board for voltage sensing is mounted on one side of the battery cell assembly, and the terminal part serves to electrically connect the printed circuit board and the bus bar. A through hole is formed in a portion where the terminal part is fastened to the bus bar, and a corresponding protrusion is formed in the bus bar, so that the terminal part is soldered in a state in which the through hole and the protrusion are fastened.

Therefore, in the battery module according to the present invention, unnecessary processes such as clamping, crimping, and laser welding processes can be eliminated by fastening the terminal part and the bus bar through a simple contact between the through hole and the protrusion, and the defect rate occurring in the process can be reduced. can

The terminal unit may be formed of, for example, a flexible printed circuit board (FPCB). Since the terminal part is formed in a non-rigid structure such as an FPCB, the shape can be freely determined according to the shape of the battery module or the connection shape between the printed circuit board and the bus bar, increasing space utilization and preventing the risk of short circuit between conductors advantage in terms of

Specifically, the terminal portion includes a plate-shaped metal layer; and an insulating layer having a structure surrounding the metal layer. includes The metal layer may be made of a material having excellent electrical conductivity, such as copper, and serves to electrically connect the bus bar and the printed circuit board. The insulating layer serves as an outer shell of the metal layer, and prevents damage to the metal layer and occurrence of a short circuit.

As described above, a through hole is formed in a portion where the terminal part is coupled to the bus bar. In this process, the metal layer is exposed on the inner circumferential surface of the through hole formed in the terminal portion, so that the inner circumferential surface of the through hole formed in the metal layer and the outer circumferential surface of the protrusion come into contact with each other to achieve electrical connection between the bus bar and the printed circuit board. In addition, the exposed portion of the metal layer may extend upward and downward to surround the inner circumferential surface of the insulating layer surrounding the metal layer. In this case, the contact area between the metal layer and the protrusion may increase by the area of the inner circumferential surface of the insulating layer.

In a specific example, the protrusion of the bus bar has a structure in which a boundary between the protrusion and the through-hole formed in the terminal unit is soldered while being inserted into the through-hole formed in the terminal unit. Therefore, in the battery module according to the present invention, it is not necessary to solder all the contact parts of the bus bar and the terminal part, and only the fastening boundary between the through hole formed in the terminal part and the protrusion formed in the bus bar is soldered, so the process can be simplified. . The metal used for soldering is a metal having a melting point of 450 degrees or less, and it is preferable that the melting point is lower than that of the bus bar as the base material and the metal constituting the metal layer, for example, copper. In addition, the metal used for soldering should have excellent wettability and fluidity to the base material, and should have excellent mechanical properties and electrical conductivity after soldering. As a metal used for the said soldering, lead is mentioned, for example.

Meanwhile, the shape of the protrusion is not particularly limited, and specifically, it may have a circular, oval, or polygonal shape based on a horizontal cross section. In particular, when the horizontal cross-section of the protrusion has a polygonal shape, it may be specifically in the shape of a quadrilateral to a 30-gonal shape. In addition, the through-hole has a shape corresponding to the protrusion of the bus bar, and like the protrusion, the through-hole may have a circular, oval, or polygonal shape.

In the battery pack according to the present invention, while the through-hole is inserted into the protrusion of the terminal portion, the through-hole portion should be in close contact with the bus bar. The protrusion is integrally formed with the bus bar, and has a structure that protrudes from one surface of the bus bar in a vertical direction. At this time, the lower end portion of the protrusion, that is, the portion where the protrusion extends from the bus bar may be configured in various shapes for close contact between the terminal unit and the bus bar. For example, the outer circumferential surface of the protrusion and the bus bar may be perpendicular to each other, and the angle between the outer circumferential surface of the protrusion and the bus bar may be an obtuse angle. An angle between the outer circumferential surface of the protrusion and the bus bar may be 90 degrees to 120 degrees, specifically, 90 degrees to 110 degrees, and more specifically, 90 degrees to 100 degrees. When the angle between the outer circumferential surface of the protrusion and the bus bar is less than 90 degrees, the diameter of the lower end of the protrusion becomes smaller than the through hole, so it is difficult to adhere the protrusion to the inner circumferential surface of the through hole formed in the terminal portion, and there is a problem that the terminal portion is not fixed by the protrusion. In addition, when the angle between the outer circumferential surface of the protrusion and the bus bar exceeds 120 degrees, the terminal may be easily separated from the bus bar by horizontal tension, which is not preferable.

In addition, when the angle between the outer circumferential surface of the protrusion and the bus bar is an obtuse angle, the inner circumferential surface of the through hole may also be inclined to correspond to the shape of the protrusion. By forming an inclination on the outer circumferential surface of the protrusion and the inner circumferential surface of the through hole as described above, the contact area between the terminal part and the protrusion is increased, and a stable electrical connection between the printed circuit board and the bus bar is possible.

Meanwhile, the height of the protrusion may be appropriately set according to the structure of the module, and the height of the protrusion may be greater than the thickness of the terminal, that is, the sum of the thicknesses of the metal layer and the insulating layer. Soldering between the protrusion and the terminal is performed at the boundary between the protrusion and the through hole formed in the terminal. When the height of the protrusion is greater than the thickness of the terminal, the soldering layer formed through soldering is formed over the outer circumferential surface of the protrusion and the upper surface of the metal layer. .

Also, the height of the protrusion may be equal to the thickness of the terminal, that is, the sum of the thicknesses of the metal layer and the insulating layer. In this case, the soldering layer formed through soldering is formed over the upper surface of the protrusion and the upper surface of the metal layer.

As described above, in the battery module according to the present invention, the bus bar generally has a plate-shaped structure, and electrode leads drawn out from a plurality of battery cells accommodated in the module are joined to perform electrical connection between the battery cells. In some of the junctions to which this ‹š busbar is bonded, positive leads are bonded, and in other parts, negative leads are bonded. At the same time, the bus bar is soldered to the terminal part drawn out from the printed circuit board, so that the printed circuit board and each battery cell are electrically connected, and the voltage of each battery cell can be measured. That is, both the electrode lead and the terminal portion should be in contact with the bus bar. To this end, in the bus bar, a junction portion for bonding electrode leads is formed in a predetermined region, and a protrusion portion for fastening the terminal portion is formed outside the region where the junction portion is formed. In addition, since a short circuit may occur when the terminal and the junction are in direct contact, the junction and the protrusion must be spaced apart from each other to the extent that the terminal and the junction do not contact each other.

In the battery module according to the present invention, the bus bar is mounted on the side from which the electrode lead of each battery cell is drawn out in the battery cell assembly. To this end, the battery module may further include a bus bar frame for mounting the bus bar. The bus bar frame may be mounted on a portion where the electrode leads are exposed so that the electrode leads of the plurality of battery cells are connected to the bus bar, and positioned between the bus bar and the battery cell assembly. In addition, since the bus bar frame is assembled and fixed to a module case to be described later, it is possible to suppress the flow of the internal battery cell even without using a separate component such as a cartridge.

The bus bar frame may have an accommodating part on which the bus bar is seated, and the accommodating part may have a recessed shape corresponding to the shape of the bus bar. The thickness of the recessed portion may correspond to the thickness of the bus bar. In addition, since the bus bar frame has a slit for the electrode lead drawn out from the battery cell to pass therethrough, the electrode lead can be bonded to the bus bar mounted on the receiving part after passing through the bus bar frame. In addition, the terminal part may be attached to be fixed to the bus bar frame.

In the battery module according to the present invention, the battery cells accommodated in the battery module are pouch-type battery cells. The pouch-type battery cell has a structure in which electrode leads are formed at one or both ends of the battery cell, the exterior material constituting the pouch is made up of two upper and lower units, and the electrode assembly is mounted in the housing formed on the inner surface of the pouch. A battery cell is manufactured by heat-sealing the outer periphery of the pouch. When electrode leads are formed at both ends of a battery cell in a pouch-type battery cell, one of the electrode leads is a positive lead, and the other formed in the opposite direction becomes a negative lead. When the electrode leads protrude in both directions in the pouch-type battery cell, the battery cells may be connected in series by alternately arranging the positive and negative leads, or the battery cells may be connected in parallel by arranging the positive and negative leads in parallel. In this case, a bus bar and a bus bar frame for connecting the electrode leads are mounted on one surface and the opposite surface of the battery cell assembly to electrically connect the electrode leads of each battery cell. In addition, the bus bars mounted on one surface and the opposite surface of the battery cell assembly are connected by the printed circuit board and the terminal unit to sense the voltage of the battery cell.

Meanwhile, since a plurality of bus bars are installed in the battery module, each of the bus bars must be connected to a printed circuit board. That is, when n bus bars are included (n is an integer greater than or equal to 2), n terminals may be drawn out from the printed circuit board to contact each bus bar. In addition, the terminal unit may have a form including a main line drawn from the printed circuit board and n branch lines connected thereto, and each branch line may have a structure connected to each bus bar. Meanwhile, n bus bars may be included (n is an integer of 2 or more), and the upper limit of the number of bus bars may be appropriately determined according to the structure of the battery module and performance to be implemented, and may be, for example, 20 or less.

In this way, the voltage values of each battery cell sensed by the printed circuit board through the terminal unit are transmitted to the printed circuit board, and the printed circuit board transmits the voltage level to the BMS. At this time, the printed circuit board may be connected to the BMS by a connector. The connector may be coupled to one end of a printed circuit board, for example. The BMS may make a mutual electrical connection with the connector through a wire or the like.

In addition, the present invention provides a battery pack, the battery pack according to the present invention includes a battery pack case including a tray and a pack cover; and a plurality of battery modules accommodated in the battery pack case; includes The battery module is the same as described above.

The battery pack includes, in addition to the battery module, electrical equipment mounted around the battery module. The electrical equipment is located between a battery management system (BMS) that monitors and controls the operation of the battery module, a battery disconnection unit (BDU) that controls the electrical connection of the battery module, and the battery module and the BMS. It includes a fuse that provides an overcurrent blocking function, and the like.

In addition, the present invention provides a device including a battery pack, for example, the device may be a car.

Hereinafter, the present invention will be described in more detail with reference to drawings and the like. However, since the configuration described in the drawings described in this specification is only one embodiment of the present invention and does not represent all the technical spirit of the present invention, various equivalents and modifications that can replace them at the time of the present application are provided. It should be understood that there may be

(First embodiment)

2 is a perspective view of a battery module according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of the battery module according to an embodiment of the present invention.

2 and 3 , the battery module 100 according to the present invention includes a battery cell assembly 110 , a module case 120 , a bus bar 130 , a printed circuit board 140 for voltage sensing, and a bus bar. and a frame 150 .

The battery cell assembly 110 may include a plurality of battery cells 111 . The plurality of battery cells 111 are stacked to be electrically connected to each other, and electrode leads 160 formed at both ends of the battery cells 111 are electrically connected to the bus bar 130 .

The bus bar frame 150 covers the front and rear sides of the battery cell assembly. The bus bar frame is mounted on a portion of the battery cell assembly 110 where the electrode leads 160 are exposed so that the electrode leads 160 formed in the plurality of battery cells 111 can be connected to the bus bars 130 . In the case of the battery module 100 according to the present embodiment, since the electrode leads 160 are formed of pouch-type battery cells protruding in both directions, the bus bar frame 150 having two as a pair is a battery cell assembly. (110) is to be mounted on the front and rear, respectively.

The bus bar frame 150 is detachably coupled to the module case 120 accommodating the battery cell assembly 110 , and is configured to cover the entire side surface of the battery cell assembly 110 . At this time, a slit (not shown) for bonding the electrode lead 160 to the bus bar 130 through the bus bar frame 150 and a bus bar accommodating part (not shown) for mounting the bus bar are formed. A plurality of slits may be formed, and some of them may communicate with an opening formed in a bus bar to be described later, so that an electrode lead may pass through the slit and the opening at the same time. After being bent through the bus bar frame 150 , the electrode lead 160 may be coupled to the junction surface of the bus bar 130 through ultrasonic or laser welding.

The module case 120 has an empty space therein, and accommodates the battery cell assembly 110 . At least one surface of the module case 120 is provided in an open form, so that the battery cell assembly 110 can be inserted through the open portion. The module case 120 may be provided in a rectangular parallelepiped shape as a whole, and may be provided in the form of a mono-frame type square tube in which opposite sides are open. The module case 120 may be made of a thermally conductive material to absorb heat from the battery cell and radiate it to the outside, and for this, the module case 120 may be made of a metal material. After the battery cell assembly 110 is accommodated in the module case, the battery module is completed by blocking both openings with the bus bar frame and the cover member 170 .

Meanwhile, the printed circuit board 140 for voltage sensing may be mounted on one side of the battery cell assembly 110 , or may be mounted on a predetermined area of the bus bar frame 150 . The printed circuit board 140 for voltage sensing is electrically connected to a battery cell to measure the voltage of the battery cell, and transmits the voltage level of the battery cell to a BMS (not shown).

4 is a schematic view showing a coupling structure of a terminal unit and a bus bar according to an embodiment of the present invention, and FIG. 5 is an enlarged view of part A of FIG. 4 . 6 is a schematic diagram illustrating a vertical cross-section of a bus bar and a terminal part according to an embodiment of the present invention.

4 to 6 , the battery module according to the present invention includes: a voltage sensing printed circuit board (not shown) for measuring a voltage of a battery cell included in the battery cell assembly; It electrically connects the battery cell assembly and the printed circuit board for voltage sensing, and includes a junction part 131 for bonding to the electrode lead 160 of the battery cell assembly and a protrusion part 132 for coupling with the printed circuit board for voltage sensing. to the bus bar 130; The printed circuit board for voltage sensing includes a terminal portion 141 having a through hole 142 coupled to the bus bar 130 .

The bus bar 130 has a rectangular plate-shaped structure having a predetermined thickness, and includes an opening through which the electrode lead 160 can pass and a bonding portion 131 through which the electrode lead can be bonded. The bonding portion 131 is formed in a predetermined area of the bus bar. The electrode lead 160 includes an anode lead 161 and a cathode lead 162 , through an opening formed in the bus bar 130 , or bent from the side of the bus bar 130 toward the bus bar, and then through welding or the like. are joined The protrusion 132 is formed outside the region where the junction part 131 is formed, and may have a circular shape based on a horizontal cross section. The through hole 142 formed in the terminal part 141 may have a shape corresponding to the shape of the protrusion part 132 . 4 to 6 , an angle between the outer peripheral surface of the protrusion 132 and the bus bar 130 is vertical. In this case, the angle between the outer circumferential surface of the protrusion and the bus bar means an angle between the outer circumferential surface of the protrusion and the bus bar plane outside the protrusion.

The bus bar 130 is mounted on the bus bar frame 150, and as previously salpinned, a slit 151 through which the electrode lead 160 can pass is formed in the bus bar frame 150. A bus bar accommodating part 152 having a recessed shape so that the bar 130 can be seated may be included.

The terminal unit 141 is drawn out from a printed circuit board for voltage sensing, and is provided as a flexible printed circuit board (FPCB). Specifically, the terminal unit 141 includes a plate-shaped metal layer 143 and an insulating layer 144 having a structure surrounding the metal layer 143 . A through hole 142 is formed in a portion where the terminal portion 141 contacts the bus bar 130 , and the metal layer 143 is exposed on the inner peripheral surface of the through hole 142 to contact the protrusion 132 . can

The voltage sensing printed circuit board and the bus bar are formed between the through hole 142 and the protrusion 132 in a state in which the through hole 142 formed in the terminal unit 141 is inserted into the protrusion 132 of the bus bar 130 . The boundary can be fastened by soldering. Accordingly, a soldering layer 145 may be formed at a boundary between the through hole and the protrusion.

(Second embodiment)

7 is a schematic diagram illustrating a vertical cross-section of a bus bar and a terminal part according to another embodiment of the present invention.

Referring to FIG. 7 , the bus bar 230 has a rectangular plate-shaped structure having a predetermined thickness. The bonding portion (not shown) is formed in a predetermined area of the bus bar 230 , and the protrusion 232 is formed outside the area in which the bonding portion is formed. In this case, an angle between the outer peripheral surface of the protrusion 232 and the bus bar 230 may be an obtuse angle. At this time, the angle between the outer peripheral surface of the protrusion and the bus bar means an angle between the outer peripheral surface of the protrusion and the plane of the bus bar outside the protrusion.

The terminal part 241 includes a plate-shaped metal layer 243 and an insulating layer 244 having a structure surrounding the metal layer 243 . A through hole 242 is formed in a portion where the terminal portion 241 contacts the bus bar 230 , and the metal layer 243 is exposed on the inner peripheral surface of the through hole 242 to be in contact with the protrusion 232 . can The inner circumferential surface of the through hole may have a shape corresponding to the slope formed on the outer circumferential surface of the protrusion.

The printed circuit board for voltage sensing and the bus bar may be fastened by soldering a boundary between the through hole and the protrusion in a state in which the through hole 242 formed in the terminal part 241 is inserted into the protrusion of the bus bar. Accordingly, a soldering layer 245 may be formed at the boundary between the through hole and the protrusion.

(Third embodiment)

8 is a schematic diagram illustrating a vertical cross-section of a bus bar and a terminal part according to another embodiment of the present invention.

Referring to FIG. 8 , the bus bar 330 has a rectangular plate-shaped structure having a predetermined thickness. The bonding portion (not shown) is formed in a predetermined area of the bus bar 330 , and the protrusion 332 is formed outside the area in which the bonding portion is formed. At this time, the angle between the outer peripheral surface of the protrusion 332 and the bus bar 330 is vertical.

The terminal part 341 includes a plate-shaped metal layer 343 and an insulating layer 344 having a structure surrounding the metal layer 343 . A through hole 342 is formed in a portion where the terminal portion 341 contacts the bus bar 330 , and the metal layer 343 is exposed on the inner peripheral surface of the through hole 342 to be in contact with the protrusion 332 . can

Meanwhile, the height of the protrusion 332 is equal to the sum of the thicknesses of the insulating layer 344 and the metal layer 343 , and the printed circuit board for voltage sensing and the bus bar 330 have a through hole 342 formed in the terminal part 341 . ) may be fastened by soldering the boundary between the through hole 343 and the protrusion 332 in a state in which the bus bar is inserted into the protrusion 332 . Accordingly, the soldering layer 345 may be formed at the boundary between the through hole and the protrusion, and specifically, it is formed over the upper surface of the protrusion 332 and the upper surface of the metal layer 343 .

(Fourth embodiment)

9 is a block diagram illustrating a connection form between a printed circuit board and a bus bar according to an embodiment of the present invention, and FIG. 10 is a block diagram illustrating a connection form between a printed circuit board and a bus bar according to another embodiment of the present invention. am.

Referring to FIG. 9 , the printed circuit board 140 for voltage sensing may be electrically connected to the bus bar 130 through the terminal unit 141 . At this time, n bus bars 130 (n is an integer of 2 or more) may be included, and 4 bus bars are configured in FIG. 9 . The terminal unit 141 is drawn out from the printed circuit board 140 for voltage sensing, and a circuit formed on the printed circuit board 140 for voltage sensing extends through the metal plate. At this time, n number of terminal parts 141 may be drawn out from one printed circuit board 140 to be connected to each bus bar 130 . Of course, a printed circuit board may be formed at both ends of the battery cell assembly, one at a time, and the printed circuit board may be connected by a separate wire or the like.

Also, referring to FIG. 10 , when n bus bars 130 are included (n is an integer greater than or equal to 2), the main line 146 is drawn from the printed circuit board 140 for voltage sensing in the terminal unit 141, and thus Since n branch lines 147 are connected, each branch line 147 may be connected to the bus bar 130 . At this time, it is configured that there are four bus bars 130 in FIG. 10 . In this case, a plurality of circuit lines may be formed in the main line, and each branch line has a structure in which at least one of the circuit lines formed in the main line is shared.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Accordingly, the drawings disclosed in the present invention are for explanation rather than limiting the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these drawings. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Meanwhile, although terms indicating directions such as up, down, left, right, front, and back are used in this specification, these terms are only for convenience of explanation, and may vary depending on the location of the object or the position of the observer. It is self-evident that it can

10, 100: battery module 11: positive lead
12: negative lead 13: bus bar
14: printed circuit board 15: crimping unit
16: welding plate 110: battery cell assembly
111: battery cell 120: module case
130, 230, 330: bus bar 131: junction
132, 232, 332: protrusion 140: printed circuit board
141, 241, 341: terminal part 142, 242, 342: through hole
143, 243, 343: metal layer 144, 244, 344: insulating layer
145, 245, 345: soldering layer 146: main line
147: branch line 150: busbar frame
151: slit 152: bus bar receiving part
160: electrode lead 161: positive lead
162: negative lead

Claims (16)

a battery cell assembly in which a plurality of battery cells including electrode leads extending from electrode tabs of each battery cell are stacked;
a printed circuit board for voltage sensing that measures the voltage of the battery cells included in the battery cell assembly; and
a bus bar electrically connecting the battery cell assembly and the printed circuit board for voltage sensing, the bus bar including a junction part for bonding to an electrode lead of the battery cell assembly and a protrusion part for coupling with the printed circuit board for voltage sensing; includes,
The printed circuit board for voltage sensing includes a terminal portion having a through hole coupled to the bus bar,
The printed circuit board for voltage sensing and the bus bar are soldered in a state in which the through hole formed in the terminal part and the protrusion of the bus bar are fastened to each other.
The method of claim 1,
The terminal part of the printed circuit board for voltage sensing,
plate-shaped metal layer; and
an insulating layer having a structure surrounding the metal layer; including,
A battery module in which a metal layer is exposed on an inner circumferential surface of a through hole formed in the terminal portion.
According to claim 1,
A battery module having a structure in which a boundary between the protrusion and the through-hole formed in the terminal unit is soldered while the protrusion of the bus bar is inserted into the through-hole formed in the terminal unit.
According to claim 1,
The protrusion is a battery module having a circular, oval or polygonal shape based on a horizontal cross section.
5. The method of claim 4,
The through hole has a shape corresponding to the protrusion of the bus bar.
According to claim 1,
An angle between the outer peripheral surface of the protrusion and the bus bar is 90 degrees to 120 degrees for the battery module.
3. The method of claim 2,
The height of the protrusion is greater than the sum of the thicknesses of the insulating layer and the metal layer.
3. The method of claim 2,
The height of the protrusion is equal to the sum of the thicknesses of the insulating layer and the metal layer.
According to claim 1,
The bus bar has a plate-shaped structure,
The junction portion is formed in a predetermined area of the bus bar,
The protrusion part is formed outside the area where the junction part is formed.
According to claim 1,
Further comprising a bus bar frame mounted between the bus bar and the battery cell assembly,
a bus bar accommodating part having a recessed shape so that the bus bar is seated; and
a slit through which the electrode lead can pass; A battery module comprising a.
11. The method of claim 10,
The electrode leads are formed at both ends of the battery cell,
A bus bar and a bus bar frame for connecting the electrode leads are mounted on one surface and the opposite surface of the battery cell assembly,
A battery module in which a bus bar mounted on one surface and the opposite surface of the battery cell assembly is connected by a printed circuit board and a terminal unit.
According to claim 1,
The bus bar includes n (n is an integer of 2 or more),
The battery module has a structure in which n terminals are drawn out from the printed circuit board and connected to each bus bar.
According to claim 1,
The bus bar includes n (n is an integer greater than or equal to 2),
The terminal unit includes a main line drawn out from the printed circuit board and n branch lines connected thereto,
A battery module having a structure in which each branch line is connected to each bus bar.
According to claim 1,
The battery module is connected to the printed circuit board, further comprising a connector for transmitting the detected voltage to a BMS (Battery Management System).
a battery pack case including a tray and a pack cover; and
a plurality of battery modules accommodated in the battery pack case; includes,
The battery module is a battery pack according to claim 1.
A device comprising the battery pack according to claim 15 .

Images