Battery pack and device including same

Abstract

A battery pack according to an embodiment of the present invention includes: a plurality of battery cells including electrode terminals; bus bars connected to the electrode terminals; and a printed circuit board (PCB) which is connected to the bus bars, senses voltage data of the battery cells, and transmits the voltage data to a BMS module which monitors and controls operations of the battery cells. The printed circuit board and the bus bars include metal materials, and thus are connected to each other by bonding the metal materials.

Description

Battery pack and device including same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0086186, filed July 1, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack and a device including the same, and more particularly, to a battery pack and a device including the same, which reduce costs and increase workability by reducing processes related to battery cell sensing and reducing parts.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras has fueled active development of technologies related to these devices. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution caused by conventional gasoline-powered vehicles. This, in turn, heightens the need for further development of these batteries.

[0005] Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydrogen batteries, nickel zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0006] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. The lithium secondary battery comprises an electrode assembly comprising a positive electrode plate and a negative electrode plate, each coated with the positive and negative electrode active materials, with a separator interposed between them, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0007] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0008] Secondary batteries used in small devices are configured with 2-3 battery cells, but secondary batteries used in medium- to large-sized devices such as automobiles utilize battery modules in which multiple battery cells are electrically connected. These battery modules enhance capacity and output by forming a battery cell stack by connecting multiple battery cells in series or parallel. In addition, one or more battery modules may be mounted together with various control and protection systems, such as a Battery Disconnect Unit (BDU), a Battery Management System (BMS), and a cooling system, to form a battery pack.

[0009] Fig. 1 is a perspective view showing a conventional battery pack (10). Fig. 2 is an enlarged view showing part “A” of Fig. 1 in an enlarged manner.

[0010] The printed circuit board (1) is configured to sense voltage data or thermal data of battery cells (8). Accordingly, the voltage data or thermal data of each battery cell (8) is sensed and transmitted to a BMS module (not shown). To this end, the printed circuit board (1) must be electrically connected to a bus bar (5) that is electrically connected to the battery cells (8). The printed circuit board (1) is connected to the bus bar (5) by wire bonding (7). For the wire bonding (7), the printed circuit board (1) includes a nickel tab (6). That is, the nickel tab (6) of the printed circuit board (1) and the bus bar (5) are connected by wire bonding (7).

[0011] In order to transmit voltage data or thermal data of battery cells (8) sensed by the printed circuit board (1) to the BMS module, the printed circuit board (1) includes a connector (3) connected to the BMS module. The printed circuit board (1) and the connector (3) are connected via a wiring harness (2). That is, the voltage data or thermal data of battery cells (8) sensed by the printed circuit board (1) are transmitted to the BMS module via the wiring harness (2) and the connector (3).

[0012] However, in order to transmit voltage data or thermal data of battery cells (8) to the BMS module, there is a disadvantage in that many parts are required and a complex series of manufacturing processes are required.

[0013] The problem to be solved by the present invention is to reduce the process of a battery pack related to battery cell sensing and to reduce the number of parts, and more specifically, to provide a battery pack and a device including the same, in which the cost can be reduced and workability can be increased through a change in the battery cell sensing structure.

[0014] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0015] A battery pack according to one embodiment of the present invention includes: a plurality of battery cells including electrode terminals; a bus bar connected to the electrode terminals; and a printed circuit board (PCB) connected to the bus bar and configured to sense voltage data of the battery cells and transmit the voltage data to a BMS module that monitors and controls the operation of the battery cells. The printed circuit board and the bus bar include a metal material, and the printed circuit board and the bus bar are connected to each other by a bond between the metal materials.

[0016] The above printed circuit board may be a flat flexible printed circuit board (FF-PCB).

[0017] The above bus bar may include an extension portion extending in one direction beyond the portion where the bus bar and the electrode terminal are connected.

[0018] The above printed circuit board can be joined to the above extension.

[0019] The printed circuit board may include aluminum.

[0020] The above bus bar and the printed circuit board can be welded together.

[0021] A connector may be connected to one end of the above printed circuit board.

[0022] A bending portion of the printed circuit board may be provided between the portion of the printed circuit board to which the bus bar is connected and the connector.

[0023] The above busbar frame may further include a busbar frame in which the busbar is arranged.

[0024] The above printed circuit board and the above busbar frame can be bolted to each other.

[0025] The above bolt may include a bolt magnet portion.

[0026] The above busbar frame may include a magnetic plate coupled to the bolt magnet portion.

[0027] According to another embodiment of the present invention, a device including the battery pack is provided.

[0028] According to embodiments of the present invention, battery cells can be sensed through welding between a busbar and a printed circuit board. This reduces the cost of the battery pack and improves workability.

[0029] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0030] Figure 1 is a perspective view showing a conventional battery pack.

[0031] Figure 2 is an enlarged view showing part “A” of Figure 1.

[0032] Figure 3 is a perspective view showing a battery pack according to one embodiment of the present invention.

[0033] Figure 4 is a plan view showing a battery pack according to one embodiment of the present invention.

[0034] Figure 5 is an exploded perspective view showing a battery pack according to one embodiment of the present invention.

[0035] Figure 6 is a perspective view showing the battery pack of Figure 3 with the pack cover removed.

[0036] Figure 7 is an enlarged view showing the “B” portion of Figure 6.

[0037] Fig. 8 is a perspective view showing the battery pack of Fig. 7 with the printed circuit board removed.

[0038] Fig. 9 is a cross-sectional view showing a cross-section taken along the cutting line A-A' of Fig. 4.

[0039] Figure 10 is an enlarged view showing the “C” portion of Figure 9.

[0040] Figure 11 is an enlarged view showing the “D” portion of Figure 3.

[0041] Fig. 12 is a cross-sectional view showing a cross-section taken along the cutting line E-E' of Fig. 4.

[0042] Fig. 13 is a perspective view showing a bolt according to one embodiment of the present invention.

[0043] Fig. 14 is a plan view showing a bolt according to one embodiment of the present invention.

[0044] Fig. 15 is a perspective view showing the battery pack of Fig. 11 with the printed circuit board removed.

[0045] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0046] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0047] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0048] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0049] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0050] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0051] FIG. 3 is a perspective view showing a battery pack (1000) according to one embodiment of the present invention. FIG. 4 is a plan view showing a battery pack (1000) according to one embodiment of the present invention. FIG. 5 is an exploded perspective view showing a battery pack (1000) according to one embodiment of the present invention. FIG. 6 is a perspective view showing the battery pack (1000) of FIG. 3 with the pack cover removed. FIG. 7 is an enlarged view showing part “B” of FIG. 6 in an enlarged manner. FIG. 8 is a perspective view showing the battery pack (1000) of FIG. 7 with the printed circuit board (110) removed.

[0052] Referring to FIGS. 3 to 8, a battery pack (1000) according to one embodiment of the present invention includes: a plurality of battery cells (100) including electrode terminals (not shown); a bus bar (140) connected to the electrode terminals; and a printed circuit board (PCB, 110) connected to the bus bar (140) and configured to sense voltage data of the battery cells (100) and transmit the voltage data to a BMS module (not shown) that monitors and controls the operation of the battery cells (100). The printed circuit board (110) and the bus bar (140) include a metal material, and the printed circuit board (110) and the bus bar (140) are connected to each other by bonding between the metal materials.

[0053] The battery pack (1000) according to the present embodiment includes a plurality of battery cells (100). The battery cell (100) according to the present embodiment may be a battery cell (100) of various shapes, for example, a pouch-shaped battery cell, a square battery cell, or a cylindrical battery cell. For example, as illustrated in FIGS. 3 to 6 , the battery cell (100) according to the present embodiment may be a cylindrical battery cell (100). Hereinafter, the cylindrical battery cell (100) will be described, but the battery cell (100) according to the present embodiment is not limited thereto, and various types of battery cells (100) may be applied.

[0054] A plurality of battery cells (100) can form a battery cell stack (200). The plurality of battery cells (100) can be arranged upright along the xy plane of Fig. 5 so that the side surfaces of the battery cell (100) bodies face each other. The electrode terminals can protrude along the +z-axis direction of Fig. 5.

[0055] The battery cell stack (200) can be stored in a pack frame (180). The pack frame (180) can physically protect the battery cell stack (200). For this purpose, the pack frame (180) can include a metal material having a predetermined strength.

[0056] The pack frame (180) according to the present embodiment may be in a form that is partially open while surrounding the lower surface (-z-axis direction of FIG. 5) of the battery cell stack (200), although not shown. Specifically, the lower portion of the pack frame (180) may have an open structure corresponding to the shape of each battery cell (100). In this case, the lower portion of the pack frame (180) may have a structure in which a plurality of circles having open centers are connected to each other. In this case, the circumference of the circles constituting a portion of the lower portion of the pack frame (180) may correspond to the circumference of the battery cells (100).

[0057] The electrode terminals of each battery cell (100) according to the present embodiment can be electrically connected to each other via a bus bar (140). The bus bar (140) is a configuration for guiding the electrical connection of the battery pack (1000), and is sufficient as long as it includes a metal material with excellent electrical conductivity, and is not limited in its shape or material.

[0058] The bus bar (140) can be electrically connected to the electrode terminal of the battery cell (100). For example, the bus bar (140) and the electrode terminal can be joined by a welding method. Specifically, the bus bar weld portion (160) can be joined to the bus bar (140) and the electrode terminal so that the battery cell (100) is electrically connected to the bus bar (140). The bus bar weld portion (160) can be joined to the bus bar (140) and the electrode terminal by resistance welding. There is no limitation on the welding method, and resistance welding, ultrasonic welding, laser welding, tornado welding, etc. can be applied.

[0059] By connecting the electrode terminals of the battery cells (100) to the bus bar (140), an electrical series or parallel connection between the battery cells (100) can be implemented.

[0060] The printed circuit board (110) according to the present embodiment may be configured to sense voltage data or thermal data of battery cells (100). Accordingly, the voltage data or thermal data of each battery cell (100) may be sensed and transmitted to the BMS module. To this end, the printed circuit board (110) may be electrically connected to a bus bar (140) that is electrically connected to the battery cells (100). As an example of the present invention, as will be described below, the printed circuit board (110) may be welded to the bus bar (140).

[0061] As described above, in order to transmit voltage data or thermal data of battery cells (8) to the BMS module in a conventional battery pack (10), a nickel tab (6) of a printed circuit board (1), wire bonding (7) connecting the nickel tab (6) and the bus bar (5), and a wiring harness (2) connecting the printed circuit board (1) and the connector (3) are required. However, in the present invention, unlike the battery cell (8) sensing structure of a conventional battery pack (10), a battery cell (100) sensing structure is applied through bonding between a bus bar (140) and a printed circuit board (110), thereby reducing the cost of the battery pack (1000) and increasing workability.

[0062] Referring again to FIGS. 3 to 8, the printed circuit board (110) according to the present embodiment may be a flat flexible printed circuit board (FF-PCB).

[0063] The printed circuit board (110) according to the present embodiment, which is a flat flexible printed circuit board, may be mounted on the upper surface of the battery cell stack (200) and extended in one direction. For example, the printed circuit board (110) may be mounted and extended along the y-axis direction of FIG. 3. The printed circuit board (110), which is a flat flexible printed circuit board, may be electrically connected while being bent.

[0064] By applying a flat flexible printed circuit board to the printed circuit board (110) according to the present embodiment, the shape of the printed circuit board (110) can be freely designed. Through this, the space occupied by the printed circuit board (110) within the battery pack (1000) can be minimized, and the space efficiency of the battery pack (1000) can be increased. In addition, the energy density of the battery pack (1000) can be maximized, and the arrangement of components of a device including the battery pack (1000) as well as the BMS module connected to the connector (130) can be easily designed.

[0065] Referring again to FIGS. 7 and 8, the busbar (140) according to one embodiment of the present invention may include an extension portion (140a) that extends in one direction beyond the portion where the busbar (140) and the electrode terminal are connected. More specifically, the busbar (140) according to the present embodiment may include an extension portion (14a) that extends in one direction beyond the portion where the busbar (140) and the electrode terminal are connected by the busbar welding portion (160).

[0066] That is, the extension (140a) refers to a specific portion of the bus bar (140), and may mean a portion extended in the longitudinal direction (+x-axis direction of FIG. 8) of the bus bar (140). As will be described later, sufficient space can be provided for joining the bus bar (140) and the printed circuit board (110) through the extension (140a). In addition, by introducing the extension (140a), a sufficient insulation distance can be secured between the components constituting the battery pack (1000), and the degree of freedom in designing the printed circuit board (110) can be increased, thereby facilitating the design of the battery pack (1000).

[0067] Referring again to FIG. 7, the printed circuit board (110) according to the present embodiment can be joined to the extension portion (140a) of the bus bar (140). By introducing the extension portion (140a), sufficient space can be provided for joining the bus bar (140) and the printed circuit board (110). In addition, by introducing the extension portion (140a), one of various joining methods can be selected when selecting a joining method between the bus bar (140) and the printed circuit board (110). For example, a welding joining method or a rivet joining method, which require a lot of space, can be adopted.

[0068] The printed circuit board (110) according to the present embodiment may include aluminum.

[0069] Specifically, the aluminum included in the printed circuit board (110) may be included in the pattern of the printed circuit board.

[0070] Referring to Fig. 2, a conventional printed circuit board (1) has a copper pattern applied thereto. Since copper is a dissimilar metal to aluminum, the copper pattern cannot be directly bonded to a bus bar (5) containing aluminum. Therefore, in order to electrically connect the printed circuit board (1) and the bus bar (5), a nickel tab (6) is provided on the printed circuit board (1), and the nickel tab (6) of the printed circuit board (1) and the bus bar (5) are connected through wire bonding (7).

[0071] However, when an aluminum pattern is applied to the printed circuit board (110), the printed circuit board (110) and the bus bar (140) including aluminum can be directly joined by a method such as welding without a separate process or part. That is, the nickel tab (6) and wire bonding (7) connection method required to electrically connect the conventional printed circuit board (1) and the bus bar (5) can be changed to a direct bonding method. Therefore, compared to the conventional battery pack, in the battery pack according to the present invention, the parts and process for the nickel tab (6) and wire bonding (7) connection method are eliminated, so the cost can be reduced and workability can be increased.

[0072] Referring again to FIG. 7, the bus bar (140) and the printed circuit board (110) according to the present embodiment can be welded together. The bus bar (140) and the printed circuit board (110) can be electrically connected through the welded joint. Specifically, the printed circuit board welding portion (150) can be welded together to the printed circuit board (110) and the bus bar (140) so that the printed circuit board (110) is electrically connected to the bus bar (140). Through this, the printed circuit board (110) can sense voltage data or thermal data of the battery cells (100) and transmit the voltage data or thermal data to the BMS module through the connector (130) described below. There is no limitation on the welding method, and resistance welding, ultrasonic welding, laser welding, tornado welding, etc. can be applied.

[0073] Referring again to FIGS. 3 and 7, a connector (130) may be connected to one end of a printed circuit board (110) according to the present embodiment. The connector (130) may be connected to a BMS module and may be responsible for transmitting voltage data, thermal data, etc. of battery cells (100) connected to the printed circuit board (110) to the BMS module.

[0074] Meanwhile, a bending portion (110b) of the printed circuit board (110) according to the present embodiment may be provided between the portion where the bus bar (140) is connected and the connector (130). In particular, in the battery pack (1000) according to the present invention, one end of the printed circuit board (110) where the connector (130) is connected may be bent toward the outside of the battery pack (1000). By freely designing the shape of the printed circuit board (110) by bending the printed circuit board (110) in this way, the space occupied by the printed circuit board (110) within the battery pack (1000) can be minimized, thereby increasing the space efficiency of the battery pack (1000) and maximizing the energy density of the battery pack (1000). In addition, it is possible to easily design the arrangement of components of a device including the battery pack (1000) as well as the BMS module connected to the connector (130).

[0075] Fig. 9 is a cross-sectional view showing a cross-section taken along the cutting line A-A' of Fig. 4. Fig. 10 is an enlarged view showing a portion “C” of Fig. 9 in an enlarged manner.

[0076] Referring to FIGS. 3, 4, 9, and 10, a battery pack (1000) according to one embodiment of the present invention may further include a busbar frame (120) in which a busbar (140) is arranged.

[0077] The busbar frame (120) can physically protect the battery cell stack (200). In addition, the busbar frame (120) can include an electrically insulating material and can prevent the busbar (140) from contacting other parts of the battery cell (100) other than the electrode terminals, thereby causing a short circuit.

[0078] The busbar frame (120) may be formed to surround the upper surface (+z-axis direction of FIG. 9) of the battery cell stack (200), with a portion thereof being open. Specifically, for connection between the busbar (140) and the battery cell (100), a portion of one surface of the busbar frame (120) corresponding to the electrode terminal of the battery cell (100) may be formed to be open.

[0079] Fig. 11 is an enlarged view showing the “D” portion of Fig. 3. Fig. 12 is a cross-sectional view showing a cross-section taken along the cutting line E-E' of Fig. 4.

[0080] Referring to FIGS. 3, 4, 11, and 12, a printed circuit board (110) and a busbar frame (120) according to one embodiment of the present invention can be bolted to each other.

[0081] A through hole (110a) through which a bolt (170) passes may be formed in the printed circuit board (110), and a fastening hole (120a) corresponding to the through hole (110a) may be formed in the bus bar frame (120). Screw threads may be formed on the inner wall of the fastening hole (120a). After the bolt (170) passes through the through hole (110a) of the printed circuit board (110), it may be fastened to the fastening hole (120a) of the bus bar frame (120).

[0082] Due to these bolt connections, the printed circuit board (110) can be fixed to the busbar frame (120). In addition, due to the bolt connections, the movement of the printed circuit board (110) in the forward, backward, left, and right directions (+x-axis, -x-axis, +y-axis, and -y-axis directions of FIG. 11) in situations such as external vibration or impact of the battery pack (1000) can be minimized. Accordingly, damage to the printed circuit board (110) due to external vibration and impact of the battery pack (1000) can be prevented.

[0083] Fig. 13 is a perspective view showing a bolt (170) according to one embodiment of the present invention. Fig. 14 is a plan view showing a bolt (170) according to one embodiment of the present invention.

[0084] Referring to FIGS. 13 and 14, a bolt (170) according to one embodiment of the present invention may include a bolt magnet portion (171). The bolt (170) may have a bolt head, and the bolt head may include a bolt magnet portion (171). The bolt magnet portion (171) may include an N pole (171a) and a S pole (171b). The N pole (171a) and the S pole (171b) of the bolt magnet portion (171) may be coupled to a magnetic plate (121, see FIG. 15) of a busbar frame (120) to be described later. That is, the N pole (171a) of the bolt magnet part (171) can be combined with the S pole (121b) of the magnetic plate (121, see Fig. 15), and the S pole (171b) of the bolt magnet part (171) can be combined with the N pole (121a) of the magnetic plate (121, see Fig. 15).

[0085] As illustrated in FIGS. 13 and 14, the bolt magnet portion (171) may be positioned at the bottom of the bolt head. In FIGS. 13 and 14, the bottom of the bolt head is divided into four equal parts, and N poles (171a) and S poles (171b) are alternately positioned. However, the number of equal parts, the positioning and shape of the N poles (171a) and S poles (171b), etc. may be variously determined depending on the required bonding force between the bolt magnet portion (171) and the magnetic plate (121, see FIG. 15).

[0086] FIG. 15 is a perspective view showing the battery pack (1000) of FIG. 11 with the printed circuit board (110) removed.

[0087] Referring to FIGS. 13 to 15, a busbar frame (120) according to one embodiment of the present invention may include a magnetic plate (121) coupled with a bolt magnet portion (171).

[0088] For example, the magnetic plate (121) may be a plastic magnetic plate. The magnetic plate (121) may include a N pole (121a) and a S pole (121b). The N pole (121a) and the S pole (121b) of the magnetic plate (121) may be coupled with the S pole (171b) and the N pole (171a) of the bolt magnet portion (171), respectively.

[0089] In Fig. 12, the magnetic plate (121) is depicted as being divided into four regions, each with an N pole (121a) and an S pole (121b) arranged alternately. However, the number of regions, the arrangement and shape of the N pole (121a) and the S pole (121b), can be variously determined by the arrangement and shape of the N pole (171a) and the S pole (171a) of the bolt magnet part (171), the bonding force required between the bolt magnet part (171) and the magnetic plate (121), etc.

[0090] By combining the bolt magnet portion (171) with the magnetic plate (121), the manufacturing process of the battery pack (1000) can be reduced compared to applying a general bolt (170). That is, if a general bolt (170) with a screw thread is applied, a process is required for the worker to fasten the bolt (170) to the fastening hole (120a) of the bus bar frame (120) with the screw thread when manufacturing the battery pack (1000). However, if a bolt (170) with a bolt magnet portion (171) applied as in the present embodiment is applied, the worker can fasten the printed circuit board (110) to the bus bar frame (120) with only a simple process of directly inserting the bolt (170) into the fastening hole (120a) of the bus bar frame (120) when manufacturing the battery pack (1000). Accordingly, the manufacturing time of the battery pack (1000) can be reduced, which can lead to a reduction in manufacturing cost and manufacturing man-hours. In addition, since there is no need to form screw threads in the fastening hole (120a) of the busbar frame (120), the manufacturing cost of the battery pack (1000) can be reduced.

[0091] According to another embodiment of the present invention, a device including a battery pack (1000) is provided.

[0092] As described above, although the battery cell (100) has been described as an example, square battery cells (100) or pouch-type battery cells (100) can also be applied to the battery pack (1000) according to an embodiment of the present invention. In addition, a battery pack (1000) including a battery module in which battery cells (100) are housed in a module frame can also be applied as an example of the present invention. A battery pack (1000) in the form of a CTP (cell to pack) in which a plurality of battery cells (100) are mounted in the battery pack (1000) without being housed in a module frame can also be applied as an example of the present invention.

[0093] The battery pack (1000) can be applied to various devices. Specifically, it can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, but is not limited thereto, and can be applied to various devices that can use secondary batteries.

[0094] In this example, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0095] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0096] Description of the symbol

[0097] 100: Battery cell

[0098] 1000: Battery pack

[0099] 110: Printed circuit board

[0100] 120: Busbar frame

[0101] 130: Connector

[0102] 140: Busbar

[0103] 150: Circuit board weld

[0104] 160: Busbar weld

[0105] 170: Volt

[0106] 180: Pack Frame

[0107] 200: Battery cell stack

Claims

1. A plurality of battery cells including electrode terminals; a bus bar connected to the above electrode terminal; and A printed circuit board (PCB) connected to the bus bar and sensing voltage data of the battery cells to transmit the voltage data to a BMS module that monitors and controls the operation of the battery cells; A battery pack, wherein the printed circuit board and the bus bar include a metal material, and the printed circuit board and the bus bar are connected to each other by a bond between the metal materials.

2. The above printed circuit board is a battery pack that is a flat flexible printed circuit board (FF-PCB).

3. In paragraph 1, A battery pack, wherein the bus bar includes an extension portion extending in one direction beyond a portion where the bus bar and the electrode terminal are connected.

4. In paragraph 1, A battery pack in which the printed circuit board is joined to the extension portion.

5. In paragraph 1, The above printed circuit board is a battery pack comprising aluminum.

6. In paragraph 1, A battery pack in which the above bus bar and the above printed circuit board are welded together.

7. In paragraph 1, A battery pack having a connector connected to one end of the above printed circuit board.

8. In paragraph 7, A battery pack, wherein a bending portion of the printed circuit board is provided between the portion of the printed circuit board to which the bus bar is connected and the connector.

9. In paragraph 1, A battery pack further comprising a busbar frame in which the above busbar is arranged.

10. In paragraph 9, A battery pack in which the printed circuit board and the busbar frame are bolted together.

11. In paragraph 10, A battery pack, wherein the above bolt includes a bolt magnet portion.

12. In paragraph 11, A battery pack, wherein the busbar frame includes a magnetic plate coupled to the bolt magnet portion.

13. A device comprising the battery pack according to paragraph 1.

Images