TW201541686A - Circuit board for secondary battery and battery pack - Google Patents

Abstract

Disclosed is a circuit board for a secondary battery, which ensures an improved safety according to a temperature of the secondary battery, and a battery pack including the circuit board. The circuit board for a secondary battery, which is connected to at least one of a cathode tab and an anode tab of the secondary battery, includes a tab coupling portion connected to the cathode tab or the anode tab, a charging/discharging path connected to the tab coupling portion to give a path through which a charging current or a discharging current of the secondary battery flows, the charging/discharging path having at least one path cutting portion formed therein, one pair of conductive plates respectively attached to both ends of the path cutting portion, the conductive plates being at least partially bent, and a current interruption module having both ends respectively connected to the one pair of conductive plates, the current interruption module sensing a temperature of the secondary battery and interrupting a current according to the sensed temperature.

Description

Circuit board for secondary battery pack and battery pack including the same

The present invention relates to a circuit board for a secondary battery pack, and more particularly to a current interrupt module having a charge/discharge current limited according to the temperature of the secondary battery pack and enabling the current interrupt module to more accurately perform its function A circuit board for a functional secondary battery pack, and a battery pack including the same.

Recently, with the active development of electric vehicles, storage battery packs, robots, satellites, etc., and the demand for portable electronic products (such as laptops, cameras, mobile phones, etc.), the demand for portable electronic products (such as laptops, cameras, mobile phones, etc.) has increased dramatically. A high-performance secondary battery pack that can be repeatedly charged and discharged.

At present, a nickel-cadmium battery pack, a nickel metal hydride battery pack, a nickel-zinc battery pack, a lithium secondary battery pack, or the like is used as a commercially available secondary battery pack. Among them, the lithium secondary battery pack has a slight to no memory effect compared to the nickel-based secondary battery pack, so the lithium secondary battery pack has advantages of free charging or discharging, low self-discharge, and high energy density. And get a lot of attention.

Lithium secondary battery packs usually use lithium oxide and carbonaceous materials as the cathode Extremely active materials and anode active materials. The lithium secondary battery pack includes an electrode group in which a cathode plate and an anode plate respectively coated with a cathode active material and an anode active material are disposed, and a separator is interposed therebetween; and an external, in other words, a battery case, It seals and holds the electrode set together with the electrolyte.

In general, the lithium secondary battery pack may be classified into an electrode group, a can type secondary battery pack included in the metal can, and an electrode group included in the bag of the aluminum laminate sheet, depending on the external shape. .

Generally, the performance of the secondary battery pack deteriorates due to temperature, and if the temperature rises, the secondary battery pack is heated or exploded. In addition, since the secondary battery pack contains various flammable substances, the heating and explosion of the secondary battery pack may cause other external components to burn or explode, which may endanger property or life. Further, if the temperature of the secondary battery pack rises to deform the shape of the assembly such as the separator, the secondary battery pack may burn or explode due to an internal short circuit of the cathode and the anode.

In this case, in order to ensure temperature safety according to the secondary battery pack, a current interruption module that limits the current according to the temperature of the secondary battery pack, such as a temperature cutoff (TCO) or a positive temperature coefficient (PTC) current interruption mode, is generally used. group.

1 is a schematic view showing a general battery pack in which a pouch type secondary battery pack 10 is connected to a current interruption module, and FIG. 2 is a schematic view showing that the protection circuit module 30 is connected to the battery pack of FIG.

In most cases, the secondary battery pack 10 (particularly the pouch type secondary battery pack 10) does not include a current interrupting module 20 that responds to temperature, such as TCO. Therefore, the current interruption module 20 such as TCO is usually connected to the outside of the pouch type secondary battery pack 10.

Further, the general pouch type secondary battery pack 10 is connected to a protection circuit module (PCM) 30 that controls charging or discharging to protect the secondary battery pack 10 from overcharging or overdischarging. However, in this case, the pouch type secondary battery pack 10 and the protection circuit module 30 are not directly connected, but a current interruption module 20 (such as a TCO) is usually inserted therebetween.

Therefore, in the prior art, as shown in FIG. 1, an electrode tab 11 (for example, a cathode ear) of the pouch type secondary battery pack 10 is first welded to one end of the current interruption module 20. Further, the cathode ear strap welded to the current interruption module 20 as described above is bent toward the pouch type secondary battery pack 10 as indicated by an arrow in FIG. 2, and placed on the terrace T of the secondary battery pack 10. Thereby, the current interruption module 20 is located closest to the secondary battery pack 10, which makes it possible to more accurately sense the temperature of the secondary battery pack 10, thereby enhancing the resulting current interruption capability.

Thereafter, the other end of the current interruption module 20 is connected to the connection portion 31 formed at the current interruption module 30. At this time, various components for controlling charging or discharging of the secondary battery pack 10 may be mounted to the protective circuit module 30, and an external connection may be provided that is connected to the external component to input or output the charging/discharging current of the secondary battery pack 10. Terminal 32.

However, in the above configuration, the current interruption module 20 should be independently attached to each of the plurality of secondary battery packs 10, which causes complicated production procedures and cost increase. In particular, the problem is further aggravated in a medium or large battery pack including a plurality of secondary battery packs 10 in a single battery pack.

In addition, in the general battery pack of the above structure, after the electrode ear 11 and the current interruption module 20 are welded, the current interruption module 20 may damage the pocket of the secondary battery pack 10, causing the electrode ear 11 to bend and current. The interrupt module 20 is placed on the terrace T of the secondary battery pack 10. Further, in the existing battery pack, in order to ensure insulation of the current interruption module 20, the insulating tape is often attached to the terrace T of the secondary battery pack 10, however, this increases production time and cost.

The present invention is designed to solve the problems of the related art, and therefore the present invention relates to a circuit board of a secondary battery pack capable of improving program efficiency and ensuring enhanced safety according to temperature of a secondary battery pack, and a battery including the same Group package.

Other objects and advantages of the present invention will be understood from the following description. In addition, it is to be understood that the objects and advantages of the present invention may be implemented by what is defined by the appended claims.

In one aspect of the present invention, a circuit board for a secondary battery pack is provided, the circuit board being connected to at least one of a cathode ear and an anode ear of the secondary battery pack, the circuit board including a cathode ear connected Or an ear coupling portion of the anode ear, connected to the ear coupling portion to provide charging of the secondary battery pack a charging/discharging path of a path through which an electric current or a discharging current has, the charging/discharging path having at least one path cutting portion formed therein, a pair of conductive plates respectively attached to both ends of the path cutting portion, The conductive plate is at least partially bent, and the two ends are respectively connected to the current interrupting module of the pair of conductive plates, and the current interrupting module senses the temperature of the secondary battery pack and interrupts the current according to the sensed temperature.

Preferably, the circuit board for the secondary battery pack of the present invention may additionally include a protection circuit module provided on the charging/discharging path to control charging or discharging of the secondary battery pack.

Still preferably, the circuit board for the secondary battery pack of the present invention may additionally include a protection circuit module that is connected to the external connection terminal to control charging or discharging of the secondary battery pack.

Still preferably, the conductive plate can have an adjustable bend angle.

Still preferably, the conductive plate is bendable vertically.

Still preferably, the conductive plate may be bent to protrude toward a position at which the secondary battery pack is positioned.

Still preferably, the electrically conductive plate is bendable in at least two portions.

Still preferably, the conductive plate is bendable such that at least a portion of the current interrupting module contacts the secondary battery pack.

Still preferably, the conductive plate may be made of a metal material.

Still preferably, the current interruption module interrupts the current when the temperature of the secondary battery pack rises above a reference temperature.

Still preferably, the current interrupt module can be a temperature cutoff (TCO) or a positive temperature coefficient (PTC) current interrupt module.

Still preferably, the ear coupling portion can be brought into contact with the cathode or anode ear by welding.

Still preferably, a plurality of the ear coupling portions are provided for coupling to a plurality of cathode ears or a plurality of anode ears.

Still preferably, the secondary battery pack may be a pouch type secondary battery pack.

In another aspect of the present invention, a battery pack including the circuit board for the above secondary battery pack is also provided.

In the aspect of the invention, before connecting the secondary battery pack to the protection circuit module, it is not necessary to perform an electrode ear for connecting a current interrupting module (such as TCO or PTC) for interrupting current according to temperature to the secondary battery pack. The program and the program for connecting the current interrupt module to the protection circuit module.

Therefore, in the present invention, the production time of the battery pack can be shortened and the production cost can be reduced, which results in improvement in productivity and productivity.

In particular, according to the above feature of the present invention, if a plurality of secondary battery packs are included in the battery pack, it is not necessary to weld the current interruption module to the electrode ears of each secondary battery pack, which greatly improves the production property.

Further, in other aspects of the present invention, it is not necessary to perform a procedure of bending the electrode ear and placing the current interruption module on the terrace of the pouch type secondary battery pack, thereby preventing the secondary battery pack from being damaged during the procedure. In addition, since this procedure can be performed, the program efficiency can be improved.

Further, in other aspects of the invention, since the current interruption module is not placed on the terrace of the pouch type secondary battery pack, the terrace may not have an insulating tape. because As a result, program efficiency is improved, which reduces production time and costs.

Further, in other aspects of the invention, the current interrupting module can protrude from the board main body and thus be located closer to the pouch type secondary battery pack. Therefore, the current interruption module can more accurately measure the temperature of the secondary battery pack, which ensures the ability to stabilize the current interruption according to the measured temperature. For this reason, the safety of the secondary battery pack can be improved.

In particular, in other aspects of the present invention, since the distance between the board main body and the current interruption module can be adjusted, the circuit board of the present invention can be easily applied to various secondary battery packs having different shapes.

10‧‧‧Secondary battery pack

11‧‧‧Electrical ear

100‧‧‧ boards

110‧‧‧ear coupling part

120‧‧‧Charging/discharging path

130‧‧‧ Conductive plate

140‧‧‧current interrupt module

150‧‧‧External connection terminal

160‧‧‧Protection circuit module

The drawings illustrate the preferred embodiments of the present disclosure, as well as the foregoing disclosure. However, the present disclosure should not be construed as being limited to the drawings.

1 is a schematic view showing a general battery pack in which a pouch type secondary battery pack is connected to a current interruption module.

2 is a schematic diagram showing the protection circuit module connected to the battery pack of FIG. 1.

Fig. 3 is an enlarged perspective view schematically showing a circuit board for a secondary battery pack according to an embodiment of the present invention.

4 is a view showing a combined state of the circuit board depicted in FIG. 3.

Figure 5 is a cross-sectional view taken along line DD' of Figure 4 .

Fig. 6 is a view showing the circuit board of the secondary battery pack shown in Fig. 4 connected to the electrode ear of the pouch type secondary battery pack.

Figure 7 is a cross-sectional view taken along line E-E' of Figure 6.

Figure 8 is a cross-sectional view schematically showing a circuit board of a secondary battery pack according to another embodiment of the present invention.

Fig. 9 is a cross-sectional view schematically showing a circuit board for a secondary battery pack according to another embodiment of the present invention, which is connected to a pouch type secondary battery pack.

Figure 10 is a cross-sectional view schematically showing a circuit board for a secondary battery pack according to another embodiment of the present invention, which is connected to a pouch type secondary battery pack.

Fig. 11 is a view showing a circuit board for a secondary battery pack according to another embodiment of the present invention, which is connected to a plurality of secondary battery packs.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before the explanation, it should be understood that the terms used in the scope of application of this specification and the appendix should not be construed as being limited to the general and dictionary meanings, but based on the principle that the inventor is allowed to define the terms appropriately for the best explanation. The meaning and concept of the technical aspects of the present invention are explained.

Therefore, the descriptions set forth herein are for the purpose of illustration only, and are not intended to limit the scope of the invention, and it is understood that other equivalents and modifications may be made without departing from the spirit and scope of the invention.

3 is an enlarged perspective view schematically showing a circuit board 100 for a secondary battery pack according to an embodiment of the present invention, and FIG. 4 shows a combined state of FIG.

3 and 4, a circuit board 100 for a secondary battery pack according to the present invention includes an ear coupling portion 110, a charging/discharging path 120, and a conductive plate 130 and current interrupt module 140.

Here, in addition to the ear coupling portion 110, the charging/discharging path 120, the conductive plate 130, and the current interruption module 140, the circuit board 100 may additionally include a body 101 made of an insulating material. For example, the circuit board main body 101 may be made of an insulating material such as plastic, and the circuit board 100 may have a substantially regular plate shape as a whole. However, the present invention is not limited to the detailed shape of such a circuit board 100, and the circuit board 100 of the present invention has various shapes depending on the applied secondary battery pack or battery pack.

Preferably, the circuit board 100 for the secondary battery pack of the present invention may be a printed circuit board (PCB). The printed circuit board can be formed into a circuit pattern by covering a thin copper foil on a board made of an insulating material and then detaching unnecessary copper foil according to a circuit design.

The ear coupling portion 110 is made of a metal such as a conductive material and is coupled to the electrode ear of the secondary battery. Therefore, the ear coupling portion 110 can be used as an inlet from which the discharge current of the secondary battery pack flows from the secondary battery pack to the circuit board 100, and the charging current of the secondary battery pack passes through the circuit board 100 therefrom. It flows out to the outlet of the secondary battery pack.

At this time, as shown in the respective drawings, a pair of ear coupling portions 110 may be provided. In this case, one ear coupling portion 110 can be coupled to the cathode ear and the other cathode ear 110 can be coupled to the anode ear. However, the present invention is not limited thereto, and only a single ear coupling portion 110 coupled only to the cathode or anode ear may be provided.

Preferably, the ear coupling portion 110 can be coupled to directly contact the electrode ears. In this case, the electrode ear and ear coupling portion 110 can be coupled by fusion bonding and fixed. In other words, the ear coupling portion 110 can directly contact the cathode or anode ear of the secondary battery pack by welding. However, other connecting members and the like may also be included between the electrode ear of the secondary battery pack and the ear coupling portion 110.

The charging/discharging path 120 is connected to the ear coupling portion 110 to provide a path through which the charging current or the discharging current of the secondary battery pack flows. In other words, the discharge current supplied by the secondary battery pack can flow to the circuit board 100 through the ear coupling portion 110, flow along the charging/discharging path 120 in the circuit board 100, and can be supplied to be connected to the circuit board 100. load. Further, the discharge current supplied to the secondary battery pack can flow from the external charging device to the circuit board 100, flow along the charging/discharging path 120 in the circuit board 100, and the secondary battery pack is supplied through the ear coupling portion 110.

When the circuit board 100 is constructed as a printed circuit board, the charging/discharging path 120 may form a circuit pattern having a copper foil. Additionally, the charge/discharge path 120 can be formed to be exposed on the substrate without being exposed to the circuit board 100.

In particular, the charge/discharge path 120 in accordance with the present invention may include at least one path cut-off portion, in other words, a portion of the current flow path, as shown by C in FIG. However, even though FIG. 3 shows that the path cutting portion forms only a single charging/discharging path 120 connected to the single ear coupling portion 110, the path cutting portion may form a charging/discharging path 120 connected to the two ear coupling portions 110. . Additionally, two or more path cut-out portions may also form a single charge/discharge path 120.

The conductive plate 130 can be constructed as a thin plate having a conductive material. For example, the conductive plate 130 may be made of a metal material having good electrical conductivity such as copper and aluminum. In addition, at least one of the conductive plates 130 (in other words, two conductive plates) 130) may be included in the circuit board 100. Further, the conductive plates 130 are attached to both ends of the path cutting portion, respectively. In other words, as shown in FIGS. 3 and 4, if a single path cutting portion is formed in the charging/discharging path 120, a single conductive plate 130 may be attached to one end of the path cutting portion, and another conductive plate 130 may be attached to The path cuts off the other end of the portion.

In particular, the conductive plate 130 is constructed to be at least partially curved. This will be described in more detail below with reference to FIG. 5.

Figure 5 is a cross-sectional view taken along line DD' of Figure 4 .

Referring to FIG. 5, the conductive plate 130 is attached to the charging/discharging path 120 and has a curved portion indicated by B at any portion. Since the conductive plate 130 is bent at least partially as described above, the conductive plate 130 can be erected at any angle according to the circuit board main body 101 forming the charging/discharging path 120.

Both ends of the current interruption module 140 are respectively connected to a pair of conductive plates 130. In other words, the current interrupt module 140 can have two conductive ends that are attached to different conductive plates 130. In particular, according to the curved portion of the conductive plate 130, the current interruption module 140 can be attached to the opposite end of the end connected to the charging/discharging path 120. Therefore, according to the bent portion, one end of the conductive plate 130 can be connected to one end of the charging/discharging path 120, and the other end can be connected to the current interruption module 140.

Since the current interruption module 140 is placed between the two conductive plates 130 separated from each other by a predetermined distance to ensure current flow, in the abnormal state, the path cut-off portion of the charge/discharge path 120 can be passed through the current interruption module 140. Electrical connection. Therefore, the charge/discharge current can flow through the charge/discharge path 120, the conductive plate 130, and the current interruption module 140.

As described above, the current interrupt module 140 can provide a path through which the charge/discharge current flows and also interrupts the current based on the ambient temperature. In particular, the current interrupt module 140 of the present invention can be mounted adjacent to the secondary battery pack to measure the temperature of the secondary battery pack and interrupt the current based on the sensed temperature.

Preferably, the current interruption module 140 interrupts the current when the temperature of the secondary battery pack rises above a reference temperature. If the temperature of the secondary battery pack rises, the performance of the secondary battery pack may deteriorate or the secondary battery pack may be damaged, which may cause the secondary battery pack to burn or explode and cause property and life loss. However, in this embodiment, the current interruption module 140 may interrupt the charging/discharging current of the secondary battery pack before the temperature of the secondary battery pack rises to a temperature at which the secondary battery pack may be damaged, burned, or exploded. . Therefore, not only the secondary battery pack but also the user who uses the secondary battery pack or other device to which the secondary battery pack is applied can be protected.

More preferably, the current interrupt module 140 can be implemented as a temperature control element such as a TCO or PTC. However, the current interrupt module 140 of the present invention is not limited thereto, and various different elements can be used.

In particular, the current interrupting module 140 of the present invention is attached to the conductive plate 130 at both ends. At this time, the conductive plate 130 is partially bent, and according to the bent portion, one end thereof is attached to the charging/discharging path 120 and the other end is erected from the circuit board main body 101. Further, the current interruption module 140 is connected to the other end of the conductive plate 130 which is erected from the circuit board main body 101 as described above. Therefore, the current interruption module 140 is connected to the charging/discharging path 120 of the circuit board 100 via the conductive plate 130 and mounted to the circuit board 100, but spaced apart from the circuit board main body 101 by a predetermined distance. In addition, therefore, the structure is in the current The breaking module 140 can be constructed to be close to the outside of the secondary battery pack, such as an aluminum bag of a pouch type secondary battery pack.

6 is a schematic view showing that the circuit board 100 for the secondary battery pack shown in FIG. 4 is connected to the electrode ear 11 of the pouch type secondary battery pack 10, and FIG. 7 is a cross section taken along line E-E' of FIG. Surface map.

Referring to FIGS. 6 and 7, the circuit board 100 for a secondary battery pack of the present invention may be connected to at least one of a cathode ear and an anode ear of the secondary battery pack 10 via the ear coupling portion 110. Further, the circuit board 100 for the secondary battery pack can provide the external connection terminal 150, and thus the charging/discharging circuit is connected to the other. Therefore, if a discharge device such as a load is connected to the external connection terminal 150, the discharge current supplied from the secondary battery pack 10 is supplied to the discharge device via the circuit board 100. Further, if a charging device such as a commercially available power source is connected to the external connection terminal 150, the charging current supplied from the charging device is supplied to the secondary battery pack 10 via the circuit board 100.

In particular, the circuit board 100 for the secondary battery pack of the present invention includes the current interruption module 140 on the charging/discharging path 120, so that the current interruption module 140 is not attached to the upper surface of the body 101 of the circuit board 100. Rather, it is connected to the circuit board 100 in a state of being spaced apart from the main body 101 of the circuit board 100 by a predetermined distance. In other words, the current interruption module 140 is attached to a portion of the partially curved conductive plate 130, the partially bent conductive plate 130 is erected from the surface of the main body 101 of the circuit board 100 at a predetermined angle, so the current interruption module 140 can be It is located closer to the secondary battery pack 10 than the upper surface of the body 101 of the circuit board 100.

Therefore, in this aspect of the invention, due to the current interruption module 140 Providing closer to the secondary battery pack 10 and sensing the temperature change more accurately can secure the safety of the secondary battery pack 10 more effectively. For example, if the temperature of the secondary battery pack 10 rises above the reference temperature, the current interruption module 140 can accurately and quickly sense this temperature rise and interrupt the flow of the charge/discharge current of the secondary battery pack 10.

Further, the pouch type secondary battery pack 10 has an accommodation space formed inside with reference numeral S, and accommodates the electrode group 12 and the electrolyte. Here, when the pouch type secondary battery pack 10 is closer to the accommodating space, the temperature of the pouch type secondary battery pack 10 can be measured more accurately. The reason for this is that in an abnormal state, the temperature in the space in which the electrode group 12 and the electrolyte are accommodated generally rises. In the present invention, since the current interruption module 140 is spaced apart from the circuit board main body 101 and is located close to the accommodation space outside the bag by bending the conductive plate 130, the secondary battery pack 10 can be sensed more accurately and quickly. temperature. Therefore, in this aspect of the invention, the safety of the secondary battery pack 10 can be more effectively improved by the current interruption module 140.

Meanwhile, the circuit board 100 for the secondary battery pack of the present invention may additionally include a protection circuit module (PCM) 160.

Here, the protection circuit module 160 is an element capable of substantially controlling charging or discharging of the secondary battery pack 10 and preventing overcharging or excessive discharging by checking the voltage or current of the secondary battery pack 10. To this end, the protection circuit module 160 can use an integrated circuit or a switching element. The protection circuit module 160 can be referred to by various terms such as a battery management unit (BMU), a protection circuit, and the like.

In particular, the circuit board 100 for a secondary battery pack of the present invention may include A protection circuit module 160 on the charging/discharging path 120. In this case, the protection circuit module 160 may be located on a portion of the main body 101 of the circuit board 100 for the secondary battery pack. In addition, at this time, since the circuit board 100 for the secondary battery pack itself can function as the protection circuit module 160, the circuit board 100 can also be used as the protection circuit module 160 or the protection circuit board. In this case, it can also be considered that the current interruption module 140 (such as TCO or PTC) is mounted to the protection circuit module 160.

Further, in the circuit board 100 for a secondary battery pack of the present invention, the protection circuit module 160 may be not located on the circuit board main body 101 but connected to the external connection terminal 150 provided on the circuit board 100. In this case, the circuit board 100 can be considered to include components of the protection circuit module 160 or components that connect the protection circuit module 160 and the secondary battery pack 10.

Preferably, the conductive plate 130 can be constructed to have an adjustable bending angle.

Figure 8 is a cross-sectional view schematically showing a circuit board 10 of a secondary battery pack according to another embodiment of the present invention.

Referring to FIG. 8, the conductive plate 130 included in the circuit board 100 is constructed to have an adjustable bend angle different from that of FIG. In other words, as indicated by the arrows in Fig. 8, the curved portion of the conductive plate 130 can be constructed to have an adjustable angle.

In this embodiment, after the electrode tab 11 of the secondary battery pack 10 is attached to the ear coupling portion 110 of the circuit board 100, the housing portion S of the pouch type secondary battery pack 10 and the current interruption module 140 are interposed. The distance between them can be adjusted by changing only the bending angle of the conductive plate 130. In particular, if the bending angle is adjusted, the curved portion of the conductive plate 130 is brought close to the secondary battery pack 10. The accommodating portion S can be constructed closer to the accommodating portion S of the secondary battery pack 10 even if the board main body 101 is fixed. Further, since the pouch type secondary battery pack 10 can have various shapes, the distance between the pouch type secondary battery pack 10 of the circuit board 100 and the accommodating portion S differs depending on the shape of the pouch type secondary battery pack 10. However, in this embodiment, even if the pouch type secondary battery pack 10 has a different shape, the current interruption module 140 can be provided to the housing portion S closest to the secondary battery pack 10 by adjusting the bending angle of the conductive plate 130. .

Still preferably, the conductive plate 130 may also be provided in a state of being bent to protrude toward the secondary battery pack 10. This will be described in more detail below with reference to FIG.

Fig. 9 is a cross-sectional view schematically showing a circuit board 100 for a secondary battery pack according to another embodiment of the present invention, which is connected to a pouch type secondary battery pack 10.

Referring to FIG. 9, the conductive plate 130 may be constructed to be bent to protrude horizontally from the board main body 101 as indicated by P. In other words, the conductive plate 130 extends to protrude in a horizontal state toward the secondary battery pack 10 in a state of being attached to the charging/discharging path 120, and a curved portion is formed in the protruding portion.

In this embodiment, the distance between the current interruption module 140 and the accommodating portion S of the secondary battery pack 10 is reduced as much as the protruding portion of the secondary battery pack 10. Therefore, the current interruption module 140 can sense the temperature of the secondary battery pack 10 more accurately.

Still preferably, the conductive plate 130 can be constructed to have two or more curved portions.

Figure 10 is a schematic view showing secondary electricity according to other embodiments of the present invention The circuit board 100 for the pool group is connected to the cross-sectional view of the pouch type secondary battery pack 10.

Referring to Figure 10, the conductive plate 130 can have two or more curved portions, as indicated by B. In this embodiment, the current interruption module 140 at one end can be closer to the housing portion S of the pouch type secondary battery pack 10. In this embodiment, if at least one of the plurality of curved portions is configured to have an adjustable bending angle, the position of the current interruption module 140 may be closer to the receiving portion S of the secondary battery pack 10, and corresponding to the bag. Various shapes of the type of secondary battery pack 10.

If the current interruption module 140 is constructed to be closest to the secondary battery pack 10 as described above, the temperature of the secondary battery pack 10 can be sensed more accurately. Preferably, the current interruption module 140 can contact the secondary battery pack 10, and more preferably, the portion where the receiving portion S of the secondary battery pack 10 is located. Therefore, the conductive plate 130 has a curved shape, and therefore the current interruption module 140 contacts the outside of the portion where the accommodating portion S of the secondary battery pack 10 is located. However, in this case, the current interruption module 140 may be surrounded by an electrically insulating material, particularly a portion that contacts the outside of the secondary battery pack 10.

In various embodiments of the present invention, the current interruption module 140 may be located near the receiving portion S of the secondary battery pack 10 as described above, and thus unlike the prior art depicted in FIG. 2, it is not necessary to place the circuit board main body 101 in the bag. On the terrace T of the type secondary battery pack 10. Therefore, it is not necessary to insert an insulating tape for electrical insulation between the circuit board 100 and the outside of the bag, and some components of the circuit board 100 may be damaged during the process of preventing the circuit board 100 from being placed on the terrace T. external. In addition, since the present invention is located at a specific current When the interrupt module 140 is placed on the terrace T closer to the housing portion S of the secondary battery pack 10, the current interruption module 140 can more accurately measure the temperature of the secondary battery pack 10, so that it can be more accurate and rapid. The method measures the temperature of the secondary battery pack 10 and interrupts the current accordingly.

Meanwhile, even though the circuit board 100 for the secondary battery pack of the present invention has been described as being connected to the single secondary battery pack 10 in the above embodiment, the present invention is not limited thereto. In other words, the circuit board 100 for the secondary battery pack of the present invention can be connected to a plurality of secondary battery packs 10.

Fig. 11 is a view showing a circuit board 100 for a secondary battery pack according to another embodiment of the present invention, which is connected to a plurality of secondary battery packs 10.

Referring to Figure 11, the circuit board 100 of the present invention can include a plurality of ear coupling portions 110 for coupling a plurality of cathode ears and/or a plurality of anode ears. Accordingly, cathode ears and/or anode ears of two or more secondary battery packs 10 can be coupled to the plurality of ear coupling portions 110.

At this time, the charging/discharging path 120 may have various patterns in the circuit board 100 depending on whether the plurality of secondary battery packs 10 are connected in series or in parallel.

Meanwhile, in this case, as shown in FIG. 11, a plurality of current interruption modules 140 may be provided to sense the temperatures of the plurality of secondary battery packs 10, and the current interruption modules 140 may be at least partially The bent conductive plates 130 are mounted close to the respective secondary battery packs 10.

If the plurality of secondary battery packs 10 are connected to the single circuit board 100 as described above, since the current interrupting module 140 (such as TCO) is mounted to the circuit board 100, only the electrodes of the plurality of secondary battery packs 10 can be used. Ear 11 attached The temperature of the plurality of secondary battery packs 10 is sensed to the circuit board 100 and a current interruption function is performed. Therefore, it is not necessary to individually attach the current interruption module 140 to the electrode ears 11 of the respective secondary battery packs 10 before connecting the electrode ears 11 of the respective secondary battery packs 10 to the circuit board 100.

The circuit board 100 for a secondary battery pack of the present invention can be applied to a pouch type secondary battery pack. In most cases, the pouch type secondary battery pack does not include a current interrupting module (such as TCO or PTC) in the secondary battery pack, and the current interrupting module of the circuit board 100 for the secondary battery pack of the present invention can be It is more suitably applied to a pouch type secondary battery pack having a housing portion S and a terrace T.

The battery pack of the present invention comprises a circuit board 100 for the above secondary battery pack. For example, as shown in FIG. 6, the battery pack of the present invention may include the above-described pouch type secondary battery pack 10 and the circuit board 100. Further, the battery pack of the present invention may include a protection circuit module 160 in a state of being mounted to or separated from the circuit board 100.

The invention has been described in detail. However, the detailed description and specific examples of the invention are intended to be construed as illustrative embodiments of the invention Various changes and modifications.

100‧‧‧ boards

101‧‧‧ Subject

110‧‧‧ear coupling part

120‧‧‧Charging/discharging path

140‧‧‧current interrupt module

150‧‧‧External connection terminal

160‧‧‧Protection circuit module

Claims (15)

A circuit board for a secondary battery pack, which is connected to at least one of a cathode ear and an anode ear of the secondary battery pack, the circuit board comprising: an ear coupling portion connected to the cathode ear or the anode ear a charging/discharging path connected to the ear coupling portion to provide a path through which a charging current or a discharging current of the secondary battery pack flows, the charging/discharging path having at least one path cutting portion formed therein; The conductive plates are respectively attached to the two ends of the path cutting portion, the conductive plates are at least partially bent; and the current interruption module is respectively connected to the pair of conductive plates, and the current interruption module senses The temperature of the secondary battery pack interrupts the current based on the sensed temperature. The circuit board for a secondary battery pack of claim 1, further comprising: a protection circuit module disposed on the charging/discharging path to control charging or discharging of the secondary battery pack. A circuit board for a secondary battery pack according to claim 1, further comprising: a protection circuit module connected to the external connection terminal to control charging or discharging of the secondary battery pack. A circuit board for a secondary battery pack according to claim 1, wherein the conductive plate has an adjustable bending angle. A circuit board for a secondary battery pack according to the first aspect of the invention, wherein the conductive plate is bent vertically. A circuit board for a secondary battery pack according to the first aspect of the invention, wherein the conductive plate is bent to protrude toward a position at which the secondary battery pack is positioned. A circuit board for a secondary battery pack according to claim 1, wherein the conductive plate is bent in at least two portions. The circuit board for a secondary battery pack of claim 1, wherein the conductive plate is bent such that at least a portion of the current interrupting module contacts the secondary battery pack. A circuit board for a secondary battery pack according to claim 1, wherein the conductive plate is made of a metal material. A circuit board for a secondary battery pack according to claim 1, wherein the current interruption module interrupts current when the temperature of the secondary battery pack rises above a reference temperature. For example, the circuit board for the secondary battery pack of claim 1 is wherein the current interruption module is a temperature cutoff (TCO) or a positive temperature coefficient (PTC) current interruption module. A circuit board for a secondary battery pack according to claim 1, wherein the ear coupling portion is in contact with the cathode or anode ear by welding. A circuit board for a secondary battery pack according to claim 1, wherein a plurality of the ear coupling portions are provided to couple to a plurality of cathode ears or a plurality of anode ears. A circuit board for a secondary battery pack according to the first aspect of the invention, wherein the secondary battery pack is a pouch-type secondary battery pack. A battery pack comprising a circuit board for a secondary battery pack according to any one of claims 1 to 14.