Battery pack

Abstract

Provided is a battery pack. The battery pack according to one aspect of the present invention comprises: a pack housing; a printed circuit board (PCB) for a battery management system (BMS), the PCB being mounted on the pack housing; and a flexible flat cable (FFC) connected to the PCB. The FFC includes: a plurality of conductive wires arranged in parallel; a sheath portion covering the plurality of conductive wires; and a concave-convex portion that is protruding or recessed from the outer circumferential surface of the sheath portion and includes a region extending in a direction that is not parallel to the longitudinal direction of the plurality of conductive wires.

Description

battery pack

[0001] The present invention relates to a battery pack. More specifically, the present invention relates to a battery pack comprising a battery management system (BMS) and a flexible flat cable (FFC) connected thereto, wherein the battery pack can prevent condensation from flowing through the flexible flat cable to a cable connector provided in the battery management system.

[0002] A lithium secondary battery is a battery that stores and produces electrical energy through the intercalation and deintercalation of lithium ions at the positive and negative electrodes.

[0003] Recently, lithium secondary batteries are widely used for driving or energy storage not only in small devices such as portable electronic devices but also in medium and large devices such as electric vehicles and energy storage systems (ESS).

[0004] As a type of power device using such lithium secondary batteries, a battery module is formed by housing multiple battery cells electrically connected together inside a module case, and a battery pack is formed by housing multiple battery modules electrically connected together inside a battery pack housing.

[0005] These battery modules or battery packs include sensing elements for measuring the voltage and temperature of multiple battery cells, a battery management system (BMS) capable of voltage balancing and temperature control functions, and cables and connectors for transmitting voltage and temperature information from the sensing elements to the BMS. In particular, flexible flat cables (FFCs) are widely used because they are lightweight and flexibly bendable, making them highly usable, and they take up less space than round cables, resulting in superior space utilization.

[0006] Meanwhile, battery packs can experience various problems as they are exposed to various environmental conditions. In particular, as the ambient temperature drops, condensation can form in the internal components and cables of the battery pack.

[0007] However, since the flexible flat cable used in the conventional battery pack has a smooth surface without any irregularities in the covering portion that wraps the wire, condensation formed in the internal configuration of the battery pack and falling on the cable and / or condensation formed on the cable could flow along the cable and enter the connector of the BMS, which caused a short circuit.

[0008] The problem to be solved by the present specification is to provide a battery pack that can prevent condensation formed in the internal configuration of the battery pack and falling onto a cable and / or condensation formed on the cable from flowing along the cable and entering the connector of the BMS, thereby preventing a short circuit from occurring at the connector.

[0009] A battery pack according to an aspect of the present disclosure for achieving the above-mentioned task may include a pack housing, a printed circuit board (PCB) for a battery management system (BMS) mounted on the pack housing, and a flexible flat cable (FFC) connected to the printed circuit board.

[0010] At this time, the flexible flat cable may include a plurality of conductive wires arranged in parallel, a covering portion covering the plurality of conductive wires, and a recessed portion including a region protruding or recessed from the outer surface of the covering portion but extending not parallel to the longitudinal direction of the plurality of conductive wires.

[0011] This prevents condensation formed in the internal configuration of the battery pack and falling onto the cable and / or condensation formed on the cable from flowing down the cable and entering the connector of the BMS, thereby preventing a short circuit from occurring at the connector.

[0012] Additionally, the uneven portion may include a first uneven portion provided on each of the widthwise edges of the covering portion, and a second uneven portion extending between the first uneven portions provided on each of the widthwise edges of the covering portion on at least one of one side and the other side of the covering portion.

[0013] Additionally, the first protruding portion is formed by protruding from the covering portion, and the side of the first protruding portion facing the battery management system can be inclined so that the farther away from the covering portion, the closer it is to the battery management system.

[0014] Additionally, the opposite side of the battery management system of the first recessed portion may be inclined so that the farther away from the covering portion, the closer it is to the battery management system, and the portion where the side of the first recessed portion facing the battery management system and the opposite side of the battery management system meet may be formed as a cutting edge.

[0015] Additionally, the second protrusion is formed by protruding from the covering portion, and the side of the second protrusion facing the battery management system can be inclined so that the farther away from the covering portion, the closer it is to the battery management system.

[0016] Additionally, the opposite side of the battery management system of the second protrusion may be inclined so that the farther away from the covering, the closer it is to the battery management system, and the portion where the side of the second protrusion facing the battery management system and the opposite side of the battery management system meet may be formed as a cutting edge.

[0017] Additionally, the second recessed portion may extend obliquely with respect to the width direction of the flexible flat cable.

[0018] In addition, the side of the first protrusion provided at least on the side closer to the battery management system among the first protrusions provided at both ends of the second protrusions extending obliquely may be inclined so that the side facing the battery management system is closer to the battery management system the farther away from the covering portion it is.

[0019] Additionally, the second recessed portions may be formed in pairs to correspond to each other on both sides of the covering portion, and the first recessed portion may be formed to connect the corresponding ends of the second recessed portions formed in pairs.

[0020] According to another aspect of the present disclosure for achieving the above-mentioned task, a battery pack is provided in which, among the first protrusions provided at both ends of the second protrusions extending obliquely, the opposite side of the battery management system of the first protrusion provided on the side farther from the battery management system can be inclined so that the farther away from the covering, the farther away from the battery management system.

[0021] Additionally, the opposite side of the battery management system of the second protrusion extending obliquely may be inclined so that the further away from the covering, the farther away from the battery management system.

[0022] According to another aspect of the present disclosure for achieving the above object, a battery pack is provided, wherein a plurality of second protrusions are formed on at least one of one side and the other side of the covering, and one of the plurality of second protrusions formed on one of the one side and the other side of the covering extends closer to one edge of the covering in one direction of the longitudinal direction of the flexible flat cable, and the other extends closer to the other edge of the covering in one direction of the longitudinal direction of the flexible flat cable.

[0023] By means of a battery pack according to the present specification, condensation formed in the internal configuration of the battery pack and falling onto the cable and / or condensation formed on the cable can be prevented from flowing along the cable and entering the connector of the BMS, thereby preventing a short circuit from occurring at the connector.

[0024] FIG. 1 is an exploded perspective view of a battery pack according to the first embodiment of the present specification and an enlarged view of a connector portion of a battery management system.

[0025] FIG. 2 is a front view of a flexible flat cable of a battery pack according to the first embodiment of the present specification.

[0026] FIG. 3 illustrates a cross-section of a flexible flat cable of a battery pack according to the first embodiment of the present specification.

[0027] FIG. 4 illustrates another cross-section of a flexible flat cable of a battery pack according to the first embodiment of the present specification.

[0028] FIG. 5 illustrates a case where a flexible flat cable is connected downward to a connector in a battery pack according to the first embodiment of the present specification.

[0029] FIG. 6 is a front view of a flexible flat cable of a battery pack according to the second embodiment of the present specification.

[0030] Figure 7 is a diagram showing the flexible flat cable illustrated in Figure 6 flipped upside down.

[0031] FIG. 8 is a front view of a flexible flat cable of a battery pack according to a third embodiment of the present specification.

[0032] FIG. 9 illustrates a cross-section of a flexible flat cable of a battery pack according to a third embodiment of the present specification.

[0033] FIG. 10 illustrates another cross-section of a flexible flat cable of a battery pack according to a third embodiment of the present specification.

[0034] FIG. 11 illustrates a case where a flexible flat cable is connected downward to a connector in a battery pack according to a third embodiment of the present specification.

[0035] Before going into the detailed description of the present invention, it should be noted that the terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his own invention in the best way. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of this application.

[0036] The same reference numbers or symbols used in each drawing attached to this specification represent parts or components that perform substantially the same functions. For convenience of explanation and understanding, the same reference numbers or symbols may be used in different embodiments. In other words, even if components with the same reference numbers are depicted in multiple drawings, they do not necessarily represent a single embodiment.

[0037] In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprises" or "comprises" should be understood to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0038] In addition, in the description below, expressions such as top, upper, lower, lower, side, front, and rear are expressed based on the direction shown in the drawing, and it is noted in advance that they may be expressed differently if the direction of the object in question changes.

[0039] Additionally, terms including ordinal numbers, such as "first," "second," etc., may be used in this specification and claims to distinguish between components. These ordinal numbers are used to distinguish identical or similar components from each other, and the use of these ordinal numbers should not be interpreted in a limited manner. For example, components associated with these ordinals should not be interpreted in a restricted manner, such as in the order of use or arrangement, based on their numbers. If necessary, each ordinal number may be used interchangeably.

[0040] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. However, the spirit of the present invention is not limited to the presented embodiments. For example, those skilled in the art who understand the spirit of the present invention may propose other embodiments within the spirit of the present invention by adding, modifying, or deleting components, etc., but these will also be considered to be within the spirit of the present invention. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

[0041] FIG. 1 is an exploded perspective view of a battery pack according to the first embodiment of the present specification and an enlarged view of a connector portion of a battery management system.

[0042] Referring to FIG. 1, a battery pack (10) may include a pack housing (11). A battery management system (13) and battery cells (12), etc. may be mounted in the pack housing (11).

[0043] The battery pack (10) may include a battery management system (13). The battery management system (13) may perform sensing elements for measuring voltage and temperature of the battery cell (12), voltage balancing, and temperature control functions.

[0044] The battery management system (13) can be mounted in the pack housing (11). The battery management system (13) can be provided on one side of the internal space of the pack housing (11). The battery management system (13) can be mounted in an upright position adjacent to one side wall of the pack housing (11). The printed circuit board (14) for the battery management system (13) can be placed in the pack housing (11) in a vertically upright position corresponding to the battery management system (13) being mounted in an upright position.

[0045] The battery management system (13) may include a connector (15). The connector (15) may be disposed on a printed circuit board (14). The connector (15) may be provided on one edge of the printed circuit board (14). The connector (15) may be provided in an upright position, depending on whether the printed circuit board (14) is upright. The connector (15) may be disposed such that a connection portion is formed laterally. That is, the connector (15) may be disposed such that a flexible flat cable (100) may be connected by approaching or inserting from the side of the printed circuit board (14).

[0046] The battery pack (10) may include a flexible flat cable (100). The flexible flat cable (100) may be connected to a printed circuit board (14) of a battery management system (13). Specifically, one end of the flexible flat cable (100) may be connected to a connector (15) provided on the printed circuit board (14) of the battery management system (13). Meanwhile, the other end of the flexible flat cable (100) may be connected to various sensing elements and controllers mounted on the battery management system (13).

[0047] The flexible flat cable (100) can be approached from the side of the printed circuit board (14) and connected or inserted into the connector (15). At this time, the flexible flat cable (100) can be connected to the connector (15) in an upright state, i.e., with both edges of the flexible flat cable (100) facing upward and downward, as the connector (15) is upright.

[0048] However, the position of the connector (15) and the connection direction of the flexible flat cable (100) are not limited to those described above. For example, the connector (15) may be provided on the upper edge of the printed circuit board (14) and positioned so that the connection portion faces upward, and the flexible flat cable (100) may be connected to or inserted into the connector (15) by approaching from the upper side of the printed circuit board (14) in the direction of gravity.

[0049] Fig. 2 is a front view of a flexible flat cable of a battery pack according to the first embodiment of the present specification. Fig. 3 illustrates a cross-section of a flexible flat cable of a battery pack according to the first embodiment of the present specification. Figs. 2 and 3 illustrate a case in which a flexible flat cable is connected horizontally to a connector in a battery pack according to the first embodiment of the present specification. Fig. 4 illustrates another cross-section of a flexible flat cable of a battery pack according to the first embodiment of the present specification. Fig. 5 illustrates a case in which a flexible flat cable is connected downward to a connector in a battery pack according to the first embodiment of the present specification.

[0050] Hereinafter, the flexible flat cable (100) of the battery pack (10) according to the first embodiment of the present specification may include a plurality of conductive wires (110), a covering portion (120), and a protruding portion (130), but some of these may be excluded and implemented, and additional configurations are not excluded.

[0051] Referring to FIGS. 3 and 4, the flexible flat cable (100) may include a plurality of conductive wires (110). The plurality of conductive wires (110) may be arranged in the width direction of the flexible flat cable (100).

[0052] The flexible flat cable (100) may include a covering (120). The covering (120) may cover a plurality of conductive wires (110). Specifically, the covering (120) may be formed on one side and the other side in the direction in which the plurality of conductive wires (110) are arranged, on the front and back sides of the plurality of conductive wires (110), and in the space between each of the plurality of conductive wires (110). The covering (120) may be formed of a flexible material, such as, for example, a synthetic resin.

[0053] Referring to FIGS. 2 to 5, the flexible flat cable (100) may include a protruding portion (130). The protruding portion (130) may protrude or be sunken in the outer circumferential surface of the covering portion (120). The protruding portion (130) may include a region extending not parallel to the longitudinal direction of the plurality of conductive wires (110). The protruding portion (130) blocks the path through which moisture due to condensation flows through the covering portion (120) toward the connector (15), thereby preventing a short circuit from occurring in the connector (15) due to factors such as moisture.

[0054] As an example of a flexible flat cable (100) of a battery pack according to the first embodiment of the present specification, the flexible flat cable (100) may have the following structure.

[0055] The uneven portion (130) has a guide structure that allows moisture to flow directionally, such as in the shape of an umbrella as a whole, and can be configured so that the inner side of the umbrella shape faces the terminal that is coupled to the connector (15), and the outer side faces the opposite side of the terminal that is coupled to the connector (15). This is described in detail as follows.

[0056] The uneven portion (130) may include a first uneven portion (131). The first uneven portion (131) may be provided on both edges of the covering portion (120), i.e., on both sides of the longitudinal edge area based on the flat surface of the flexible flat cable (100). The first uneven portion (131) may be formed by protruding from the covering portion (120).

[0057] The first protrusions (131) may be provided in multiple numbers on each of the two edges of the covering portion (120). This allows moisture to be repeatedly prevented from flowing through the covering portion (120) to the connector (15), thereby effectively preventing a short circuit due to moisture. However, the present invention is not limited thereto, and the first protrusions (131) may be provided only once on each of the two edges of the covering portion (120).

[0058] Referring to FIG. 3, the surface (1311) of the first recessed portion (131) facing the battery management system (13) may be inclined toward the battery management system (13) the farther away it is from the covering portion (120), that is, toward the terminal connected to the connector (15). That is, with reference to FIG. 3, among the two surfaces constituting the first recessed portion (131), the left surface (1311) may be inclined so that the farther away it is from the covering portion (120), the closer it is to the battery management system (13).

[0059] Specifically, as illustrated in FIG. 5, when a flexible flat cable (100) approaches the battery management system (13) in the direction of gravity (g) and is connected to the connector (15), moisture due to condensation can flow in the direction of gravity (g) along the covering (120). At this time, if the surface (1311) of the first protruding portion (131) facing the battery management system (13) is inclined so that the farther away it is from the covering (120), the closer it is to the battery management system (13), the moisture can be prevented from flowing down along the first protruding portion (131) and then along the covering (120).

[0060] The uneven portion (130) may include a second uneven portion (132). The second uneven portion (132) may be formed on at least one of one surface and the other surface of the covering portion (120). The second uneven portion (132) may extend between the first uneven portions (131) provided on each of the widthwise edges of the covering portion (120). The second uneven portion (132) may be formed to protrude from the covering portion (120).

[0061] The second protrusion (132) may be provided in multiple numbers. This prevents moisture from flowing through the covering (120) to the connector (15) multiple times, effectively preventing a short circuit due to moisture. However, this is not limited to this, and only one second protrusion (132) may be provided.

[0062] In the case where the second protrusion (132) extends obliquely with respect to the width direction of the flexible flat cable (100), the surface (1311) facing the battery management system (13) of the first protrusion (131) provided at least on the side closer to the battery management system (13) among the first protrusions (131) provided at both ends of the second protrusion (132) can be inclined so that the farther away from the covering (120), the closer it is to the battery management system (13).

[0063] Specifically, when the second protrusion (132) extends obliquely with respect to the width direction of the flexible flat cable (100), as shown in FIG. 5, when the flexible flat cable (100) approaches the battery management system (13) in the direction of gravity (g) and is connected to the connector (15), moisture flowing along the covering (120) is guided along the path to the left along the second protrusion (132) formed obliquely, and then can reach the first protrusion (131) formed on the side closer to the battery management system (13) among the first protrusions (131) formed at both ends of the second protrusion (132). Accordingly, among the first protrusions (131) provided at both ends of the second protrusions (132), it may be preferable that at least the first protrusion (131) provided on the side closer to the battery management system (13) is formed so that the surface (1311) facing the battery management system (13) is inclined toward the battery management system (13) as it gets farther away from the covering part (120) so that induced moisture does not pass over the first protrusions (131).

[0064] More preferably, the surface (1311) facing the battery management system (13) of each of the first protrusions (131) provided on both edges of the covering portion (120) may be inclined so that the farther away from the covering portion (120), the closer to the battery management system (13). Through this, when the flexible flat cable (100) approaches the battery management system (13) in the direction of gravity (g) as shown in FIG. 5 and is connected to the connector (15), moisture can be prevented from flowing over the first protrusions (131) and into the connector (15), regardless of which edge of the both edges of the covering portion (120) the moisture is guided to.

[0065] Meanwhile, referring to FIG. 3, the opposite side (1312) of the first recessed portion (131) facing the battery management system (13) can be inclined so that the farther away it is from the covering portion (120), the closer it is to the battery management system (13). Through this, since the opposite side (1312) of the battery management system (13) of the first recessed portion (131) and the edge of the covering portion (120) adjacent thereto form an obtuse angle with each other, moisture flowing in through the covering portion (120) can smoothly flow to the opposite side (1312) of the battery management system (13) of the first recessed portion (131), be guided to the end of the first recessed portion (131), and then be separated from the flexible flat cable (100).

[0066] The part where the surface (1311) of the first recessed portion (131) facing the battery management system (13) and the surface (1312) of the first recessed portion (131) opposite the battery management system (13) meet can be formed as a tip. That is, based on FIG. 3, it can be understood that the end of the first recessed portion (131) is formed as a tip. If, as in FIG. 5, the flexible flat cable (100) approaches the battery management system (13) in the direction of gravity (g) and is connected to the connector (15), if the part where the surface (1311) of the first recessed portion (131) facing the battery management system (13) and the surface (1312) of the first recessed portion (131) opposite the battery management system (13) meet is formed blunt, some of the moisture can flow over the first recessed portion (131) and then continue to flow over the covering portion (120). Conversely, if the end of the first protruding portion (131) is formed as a cutting edge, moisture flowing along the opposite side (1312) of the battery management system (13) of the first protruding portion (131) can easily escape from the flexible flat cable (100) at the end of the first protruding portion (131).

[0067] Referring to FIG. 4, the surface (1321) of the second protruding portion (132) facing the battery management system (13) can be inclined so that the farther away it is from the covering portion (120), the closer it is to the battery management system (13). That is, with reference to FIG. 4, among the two surfaces constituting the second protruding portion (132), the left surface (1321) can be inclined so that the farther away it is from the covering portion (120), the closer it is to the battery management system (13).

[0068] Specifically, as illustrated in FIG. 5, when a flexible flat cable (100) approaches the battery management system (13) in the direction of gravity (g) and is connected to the connector (15), moisture due to condensation can flow in the direction of gravity (g) along the covering (120). At this time, if the surface (1321) of the second protruding portion (132) facing the battery management system (13) is inclined toward the battery management system (13) as it gets farther away from the covering (120), the moisture can be prevented from flowing down along the second protruding portion (132) and then back down along the covering (120).

[0069] The opposite side (1322) of the battery management system (13) of the second recessed portion (132) can be inclined toward the battery management system (13) as it gets farther away from the covering portion (120). Through this, since the opposite side (1322) of the battery management system (13) of the second recessed portion (132) and one or the other side of the covering portion (120) adjacent thereto form an obtuse angle with each other, moisture flowing in through the covering portion (120) can smoothly flow to the opposite side (1322) of the battery management system (13) of the second recessed portion (132) and be guided to the end of the second recessed portion (132) and then be separated from the flexible flat cable (100).

[0070] The part where the surface (1321) of the second recessed portion (132) facing the battery management system (13) and the surface (1322) of the second recessed portion (132) opposite to the battery management system (13) meet can be formed as a cutting edge. That is, based on FIG. 4, it can be understood that the end of the second recessed portion (132) is formed as a cutting edge. Through this, moisture that has flowed along the surface (1322) of the second recessed portion (132) opposite to the battery management system (13) does not flow along the second recessed portion (132) to the surface (1321) facing the battery management system (13) and can be easily separated from the flexible flat cable (100) at the end of the second recessed portion (132).

[0071] Referring to FIG. 2, the second protrusion (132) may extend obliquely with respect to the width direction of the flexible flat cable (100). The flexible flat cable (100) may be connected to the connector (15) by approaching the battery management system (13) from the side as shown in FIG. 2, and at this time, the flexible flat cable (100) may be connected to the connector (15) by standing in a direction in which the lower end of the second protrusion (132) is positioned further away from the battery management system (13) than the upper end. Through this, moisture approaching the battery management system (13) through the covering (120) may be blocked from flowing by the second protrusion (132) and then may fall away from the battery management system (13) along the angle of the second protrusion (132).

[0072] The second uneven portions (132) may be formed in pairs on both sides of the covering portion (120) to correspond to each other. That is, the second uneven portions (132) on one side of the covering portion (120) and the second uneven portions (132) on the other side of the covering portion (120) may be provided in mirror symmetry with each other. In addition, the first uneven portions (131) provided on both edges of the covering portion (120) may be formed to connect the corresponding ends of the second uneven portions (132) formed in pairs. In other words, the uneven portions (130) including the first uneven portions (131) and the second uneven portions (132) may be provided to form a closed curve around the covering portion (120). Through this structure, the uneven portion (130) can be formed by joining the ring-shaped member and the covering portion (120) to each other after the ring-shaped uneven portion member is secured to the outer surface of the covering portion (120), so that a flexible flat cable (100) for preventing moisture from entering the connector (15) can be easily manufactured.

[0073] However, the method of forming the uneven portion (130) may not be limited thereto. For example, the uneven portion (130) may be injected in a pre-planned shape during the injection step of the covering portion (120). In addition, when the uneven portion (130) is formed by being recessed from the covering portion (120), the uneven portion (130) may be formed by applying pressure or heat to the outer surface of the covering portion (120).

[0074] The uneven portion (130) may be configured with the same material as the covering portion (120). In particular, this may be the case when pressure is applied to the covering portion (120) to form the uneven portion (130), or when the covering portion (120) and the uneven portion (130) are formed simultaneously (e.g., using a press method, etc.).

[0075] Fig. 6 is a front view of a flexible flat cable of a battery pack according to the second embodiment of the present specification. Fig. 7 is a view of the flexible flat cable illustrated in Fig. 6 turned upside down.

[0076] Specifically, FIGS. 6 and 7 both illustrate a flexible flat cable (200) viewed from one side of a covering portion (220), and in particular, FIG. 6 illustrates that the flexible flat cable (200) is connected to a connector (25) of a battery management system (23) arranged on the left side, while FIG. 7 illustrates that the flexible flat cable (200) is connected to a connector (25) of a battery management system (23) arranged on the right side.

[0077] The detailed configuration of the flexible flat cable (200) of the battery pack according to the second embodiment of the present specification, which is not described below, may be the same as the detailed configuration of the flexible flat cable (100) of the battery pack according to the first embodiment of the present specification.

[0078] In particular, the uneven portion (230) may have a guide structure that allows moisture to flow directionally, such as in the shape of an umbrella, and may be configured so that the inner side of the umbrella shape faces the terminal that is coupled to the connector (15), and the outer side faces the opposite side of the terminal that is coupled to the connector (15). This is the same as the feature of the first embodiment above.

[0079] Referring to FIG. 6, a plurality of second protrusions (232) may be formed on at least one of one surface and the other surface of the covering portion (220). At this time, one of the plurality of second protrusions (232) formed on one of the one surface and the other surface of the covering portion (220) may extend so as to approach one edge of the width direction of the covering portion (220) based on one direction of the longitudinal direction of the flexible flat cable (200), and the other may extend so as to approach the other edge of the covering portion (220) based on one direction of the longitudinal direction of the flexible flat cable (200). In other words, the plurality of second protrusions (232) may be understood as two second protrusions (232) formed obliquely with respect to the width direction of the flexible flat cable (200) and extending obliquely in different directions.

[0080] Through this, regardless of whether the flexible flat cable (200) is connected to the battery management system (23) from the right side or the left side, the plurality of second protrusions (232) may include second protrusions (232) that are inclined so that the lower end is positioned further away from the battery management system (23) than the upper end. For example, in FIG. 6, the second second protrusion (232) from the left may correspond to this, and in FIG. 7, the first and third second protrusions (232) from the right may correspond to this. Through this, regardless of the connection direction of the flexible flat cable (200), it is possible to cause moisture to fall away from the battery management system (23), and thus moisture ingress into the connector (25) can be effectively prevented.

[0081] Fig. 8 is a front view of a flexible flat cable of a battery pack according to a third embodiment of the present disclosure. Fig. 9 illustrates a cross-section of a flexible flat cable of a battery pack according to a third embodiment of the present disclosure. Figs. 8 and 9 illustrate a case in which a flexible flat cable is connected horizontally to a connector in a battery pack according to a third embodiment of the present disclosure. Fig. 10 illustrates another cross-section of a flexible flat cable of a battery pack according to a third embodiment of the present disclosure. Fig. 11 illustrates a case in which a flexible flat cable is connected downward to a connector in a battery pack according to a third embodiment of the present disclosure.

[0082] The detailed configuration of the flexible flat cable (300) of the battery pack according to the third embodiment of the present specification, which is not described below, may be the same as the detailed configuration of the flexible flat cable (100) of the battery pack according to the first embodiment of the present specification and the flexible flat cable (200) of the battery pack according to the second embodiment of the present specification.

[0083] The difference from the first and second embodiments is that the uneven portion (330) has a guide structure that allows moisture to flow directionally, such as in the shape of an umbrella, but the inner side of the umbrella shape in the area of ​​the uneven portion (330) excluding the end on the connector (15) side may be configured so that a valley where moisture gathers is formed by facing the opposite side of the terminal that is connected to the connector (15). This is described in detail as follows.

[0084] Referring to FIGS. 8 and 9, the opposite side surface (3312) of the battery management system (33) of the first recessed portion (331) provided on the side farther from the battery management system (33) among the first recessed portions (331) provided at both ends of the second recessed portions (332) extending obliquely may be inclined so as to be further from the battery management system (33) the farther away it is from the covering portion (320). In addition, referring to FIGS. 8 and 10, the opposite side surface (3312) of the battery management system (33) of the second recessed portion (332) extending obliquely may be inclined so as to be further from the battery management system (33) the farther away it is from the covering portion (320).

[0085] In other words, it can be understood that the cross-sectional shape of the first concave portion (331) provided on the side closer to the battery management system (33) among the first concave portions (331) provided on both ends of the second concave portion (332), the cross-sectional shape of the first concave portion (331) provided on the side farther from the battery management system (33) among the first concave portions (331) provided on both ends of the second concave portion (332), and the cross-sectional shape of the second concave portion (332) are formed in opposite directions. With respect to one continuous concave portion (330) of FIG. 8 as a reference, the first concave portion (331) provided on the side closer to the battery management system (33) is provided so that the inner side of the umbrella faces the left, and the first concave portion (331) and the second concave portion (332) provided on the side farther from the battery management system (33) are provided so that the inner side of the umbrella faces the right.

[0086] Specifically, as illustrated in FIG. 11, when the flexible flat cable (300) approaches the battery management system (33) in the direction of gravity (g) and is connected to the connector (35), moisture flowing down the covering (320) in the direction of gravity (g) can be guided toward the left first uneven portion (331) by the right first uneven portion (331) and the second uneven portion (332), and the guided moisture can be released from the flexible flat cable (300) at the left first uneven portion (331).

[0087] More specifically, the opposite sides (3312, 3322) of the battery management system (33) of each of the first right-hand recessed portion (331) and the second right-hand recessed portion (332) and the edge and surface of the covering portion adjacent thereto can form an acute angle with each other, so that moisture flowing down the surface of the covering portion (320) and the right edge cannot pass the first right-hand recessed portion (331) and the second right-hand recessed portion (332), and can be guided toward the left-hand first recessed portion (331) along the valley formed between the second recessed portion (332) and the surface of the covering portion (320). Through this structure, the point of drop of moisture can be more easily predicted, so that a short circuit due to moisture can be effectively prevented through an appropriate design of the battery management system (33).

[0088] In addition, as illustrated in FIG. 8, even when the flexible flat cable (300) approaches the battery management system (33) from the side and is connected to the connector (35), the tip of the first protruding portion (331) positioned downward in the direction of gravity (g) faces the opposite side of the battery management system (33), so that moisture can fall away from the battery management system (33), and thus, short circuit caused by moisture can be effectively prevented.

[0089] Any or all of the embodiments of this specification described above are not mutually exclusive or distinct. Any or all of the embodiments of this specification described above may have their respective components or functions combined or used together.

[0090] For example, it means that a configuration A described in a particular embodiment and / or drawing can be combined with a configuration B described in another embodiment and / or drawing. That is, even if a combination between configurations is not directly described, it means that a combination is possible, except in cases where a combination is described as impossible.

[0091] The above detailed description should not be construed as limiting in any respect and should be considered illustrative only. The scope of this specification should be determined by a reasonable interpretation of the appended claims, and all changes within the equivalent scope of this specification are intended to be embraced therein.

[0092] [Explanation of symbols]

[0093] 10: Battery pack

[0094] 11: Pack Housing

[0095] 12: Battery cell

[0096] 13, 23, 33: Battery Management System

[0097] 14: Printed circuit board

[0098] 15, 25, 35: Connector

[0099] 100, 200, 300: Flexible flat cable

[0100] 110: Conductive wire

[0101] 120, 220, 320: Covering

[0102] 130: Uneven surface

[0103] 131, 331: First convex section

[0104] 1311, 3311: The surface facing the battery management system of the first convex section

[0105] 1312, 3312: Opposite side of battery management system of first protrusion

[0106] 132, 232, 332: Second convex section

[0107] 1321, 3321: The surface facing the battery management system of the second protrusion

[0108] 1322, 3322: Opposite side of the battery management system of the second protrusion

Claims

1. Pack housing; A printed circuit board (PCB) for a battery management system (BMS) mounted in the above pack housing; and Includes a flexible flat cable (FFC) connected to the above printed circuit board, The above flexible flat cable is, A plurality of conductive wires arranged in parallel; A covering portion covering the plurality of conductive wires; and A battery pack including a recessed portion that protrudes or is sunken from the outer surface of the covering portion, but includes a region that extends not parallel to the longitudinal direction of the plurality of conductive wires.

2. In paragraph 1, A battery pack including a first uneven portion provided on each of the widthwise edges of the covering portion, and a second uneven portion extending between the first uneven portions provided on each of the widthwise edges of the covering portion on at least one of one side and the other side of the covering portion.

3. In paragraph 2, The above first recessed portion is formed by protruding from the covering portion, A battery pack in which the surface of the first recessed portion facing the battery management system is inclined so that the surface is closer to the battery management system the farther away it is from the covering portion.

4. In paragraph 3, The opposite side of the battery management system of the first recessed portion is inclined so that the farther away from the covering portion, the closer it is to the battery management system. A battery pack in which a portion where the surface facing the battery management system of the first recessed portion and the surface opposite to the battery management system meet is formed as a cutting edge.

5. In paragraph 2, The above second recessed portion is formed by protruding from the covering portion, A battery pack in which the surface of the second recessed portion facing the battery management system is inclined so that the surface is closer to the battery management system the farther away it is from the covering portion.

6. In paragraph 5, The opposite side of the battery management system of the second recessed portion is inclined so that the farther away from the covering portion, the closer it is to the battery management system. A battery pack in which a portion where the surface facing the battery management system of the second recessed portion and the surface opposite to the battery management system meet is formed as a cutting edge.

7. In paragraph 2, A battery pack in which the second recessed portion extends obliquely with respect to the width direction of the flexible flat cable.

8. In paragraph 7, A battery pack in which a surface of the first recessed portion provided on at least one end of the second recessed portion extending obliquely and which is closer to the battery management system is inclined so that the surface facing the battery management system is closer to the battery management system as it gets farther from the covering portion.

9. In paragraph 7, A battery pack in which a surface of the first recessed portion provided on both ends of the second recessed portion extending obliquely, and which is provided on a side farther from the battery management system, is inclined so as to be farther away from the battery management system as the surface is farther from the covering portion.

10. In paragraph 9, A battery pack in which the opposite side of the battery management system of the second recessed portion extending obliquely is inclined so as to be further away from the battery management system as it gets farther from the covering portion.

11. In paragraph 2, The above second protrusions are formed in multiple numbers on at least one of one side and the other side of the covering portion, A battery pack wherein one of the plurality of second protrusions formed on one side and the other side of the covering portion extends so as to approach one edge of the covering portion based on one direction of the longitudinal direction of the flexible flat cable, and the other one extends so as to approach the other edge of the covering portion based on one direction of the longitudinal direction of the flexible flat cable.

12. In paragraph 2, The above second protrusions are formed in pairs on both sides of the covering portion so as to correspond to each other, A battery pack in which the first recessed portion is formed to connect corresponding ends of the second recessed portions formed in the pair.

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