Battery pack

Abstract

A battery pack is provided. A battery pack according to one aspect of this specification includes 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, wherein the flexible flat cable includes a plurality of conductive wires arranged side by side, a covering portion covering the plurality of conductive wires, and an uneven portion including a region that protrudes or retracts from the outer circumferential surface of the covering portion but extends so as not to be parallel to the longitudinal direction of the plurality of conductive wires.

Description

Technical Field

[0001] The present invention relates to a battery pack. More specifically, in a battery pack including a battery management system (BMS) and a flexible flat cable (FFC) connected thereto, the present invention relates to a battery pack capable of preventing condensation from flowing into a cable connector provided in the battery management system along the flexible flat cable.

Background Art

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

[0003] Recently, lithium secondary batteries are widely used 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) for driving and energy storage.

[0004] As one form of a power device using such a lithium secondary battery, a battery module is configured by housing a plurality of battery cells together inside a module case in an electrically connected state, and a battery pack is configured by housing a plurality of battery modules together inside a battery pack housing in an electrically connected state. This form is widely used.

[0005] Such 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 often used because they are lightweight and flexible, offering excellent usability, and occupy less space than circular cables, thus providing superior space utilization.

[0006] On the other hand, battery packs can experience a variety of problems due to exposure to diverse environmental conditions. In particular, low ambient temperatures can cause condensation to form on the internal components and cables of the battery pack.

[0007] However, the flexible flat cables used in conventional battery packs have a smooth, non-irregular surface on the sheath covering the wires. As a result, condensation formed in the internal structure of the battery pack and / or condensation formed on the cable can flow down the cable and into the BMS connector, which can cause short circuits. [Overview of the project] [Problems that the invention aims to solve]

[0008] The problem that this specification aims to solve is one in which at least some of the problems of the prior art have been devised, and the present invention provides a battery pack that can prevent condensation formed in the internal structure of the battery pack and falling onto the cable, and / or condensation formed on the cable, from flowing down the cable and into the connector of the BMS, thereby preventing a short circuit from occurring at the connector. [Means for solving the problem]

[0009] A battery pack relating to one aspect of this disclosure for achieving the aforementioned objectives 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] In this case, the flexible flat cable may include a plurality of conductive wires arranged side by side, a covering portion that covers the plurality of conductive wires, and an uneven portion that protrudes or recedes from the outer surface of the covering portion but extends so as not to be parallel to the longitudinal direction of the plurality of conductive wires.

[0011] Through this, condensation formed in the internal configuration of the battery pack and dripping onto the cable, and / or condensation formed on the cable, can be prevented from flowing down the cable and into the BMS connector, thereby preventing a short circuit from occurring at the connector.

[0012] Furthermore, 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 from between the first uneven portions provided on each of the widthwise edges of the covering portion on at least one of one of the surfaces of the covering portion.

[0013] Furthermore, the first protrusions are formed to protrude from the covering portion, and the surface of the first protrusions facing the battery management system can be tilted so that it approaches the battery management system as it is further away from the covering portion.

[0014] Furthermore, the side of the first protrusion opposite the battery management system is inclined to move closer to the battery management system as it is further from the covering, and the portion where the side of the first protrusion facing the battery management system and the side opposite the battery management system intersect can be formed as a tip.

[0015] Furthermore, the second protrusions are formed to protrude from the covering portion, and the surface of the second protrusions facing the battery management system can be tilted so that it approaches the battery management system the further it is from the covering portion.

[0016] Furthermore, the side of the second protrusion opposite the battery management system is inclined to move closer to the battery management system the further it is from the covering, and the point where the side of the second protrusion facing the battery management system and the side opposite the battery management system intersect can be formed as a tip.

[0017] Furthermore, the second protrusion may be extended diagonally with respect to the width direction of the flexible flat cable.

[0018] Furthermore, of the first protrusions provided at both ends of the diagonally extending second protrusion, the surface of the first protrusion that faces the battery management system, at least the one closer to the battery management system, can be tilted so that it moves closer to the battery management system the further it is from the covering.

[0019] Furthermore, the second protrusions may be formed in pairs on both sides of the covering portion so as to correspond to each other, and the first protrusions may be formed to connect the ends corresponding to the paired second protrusions.

[0020] A battery pack relating to the other aspect of this disclosure for achieving the aforementioned objectives is such that the side of the first protrusions on the side furthest from the battery management system, of the first protrusions provided at both ends of the diagonally extending second protrusions, can be tilted so that it moves further away from the battery management system as it moves further away from the covering.

[0021] Furthermore, the side of the second protruding section that extends diagonally, opposite to the battery management system, can be tilted so that it moves further away from the battery management system the further it is from the covering section.

[0022] In yet another aspect of the present disclosure for achieving the above object, in the battery pack, a plurality of second concavo-convex portions are formed on at least one of one surface and the other surface of the covering portion, and any one of the plurality of second concavo-convex portions formed on either one of the one surface and the other surface of the covering portion extends so as to approach an edge on one side of the covering portion with respect to one direction in the longitudinal direction of the flexible flat cable, and any other one of them may extend so as to approach an edge on the other side of the covering portion with respect to one direction in the longitudinal direction of the flexible flat cable.

Advantages of the Invention

[0023] Through the battery pack according to the present specification, it is possible to prevent dew condensation formed inside the battery pack and falling on the cable and / or dew condensation formed on the cable from flowing along the cable and flowing into the connector of the BMS, thereby preventing a short circuit from occurring in the connector.

Brief Description of the Drawings

[0024] [Figure 1] A disassembled perspective view of the battery pack according to the first embodiment of the present specification and an enlarged view of the connector portion of the battery management system are shown. [Figure 2] A front view of the flexible flat cable of the battery pack according to the first embodiment of the present specification. [Figure 3] A cross-sectional view of the flexible flat cable of the battery pack according to the first embodiment of the present specification is shown. [Figure 4] Another cross-sectional view of the flexible flat cable of the battery pack according to the first embodiment of the present specification is shown. [Figure 5] In the battery pack according to the first embodiment of the present specification, a case where the flexible flat cable is connected downward to the connector is shown. [Figure 6] A front view of the flexible flat cable of the battery pack according to the second embodiment of the present specification. [Figure 7] This is a view showing the flexible flat cable illustrated in FIG. 6 turned upside down vertically. [Figure 8] This is a front view of the flexible flat cable of the battery pack according to the third embodiment of this specification. [Figure 9] This is a view showing a cross-section of the flexible flat cable of the battery pack according to the third embodiment of this specification. [Figure 10] This is a view showing another cross-section of the flexible flat cable of the battery pack according to the third embodiment of this specification. [Figure 11] This is a view showing the case where the flexible flat cable is connected downward to the connector in the battery pack according to the third embodiment of this specification.

Embodiments for Carrying Out the Invention

[0025] Prior to the detailed description of this application, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. The inventor must interpret them in a meaning and concept that conforms to the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the terms 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 ideas of the present invention. Therefore, it must be understood that there can be various equivalents and变型 forms that can replace them at the time of this application.

[0026] The same reference numerals or signs described in each of the drawings attached to this specification indicate components or constituent elements that perform substantially the same functions. For the convenience of explanation and understanding, the same reference numerals or signs can be used to explain even in different embodiments. That is, even if components having the same reference numeral are illustrated in a plurality of drawings, the plurality of drawings do not all mean one embodiment.

[0027] In the following descriptions, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as “contains” or “constitutes” are intended to specify the existence of features, figures, stages, operations, components, parts, or combinations thereof described in the specification, and should be understood not to preemptively exclude the existence or possibility of adding one or more different features, figures, stages, operations, components, parts, or combinations thereof.

[0028] Furthermore, in the following explanation, terms such as upper, top, lower, bottom, side, front, and rear are used based on the direction shown in the drawing, and it should be made clear beforehand that they may be used differently if the direction of the object in question is changed.

[0029] Furthermore, in this specification and the claims, terms including ordinal numbers, such as "first," "second," etc., may be used to distinguish between components. Such ordinal numbers are used to distinguish identical or similar components from one another, and the use of such ordinal numbers should not restrict the meaning of the terms. For example, components combined with such ordinal numbers should not be restricted in terms of their order of use or arrangement by the numbers. If necessary, the ordinal numbers may be used alternately with each other.

[0030] Embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the spirit of the present invention is not limited to the embodiments presented. For example, a person skilled in the art who understands the spirit of the present invention may propose other embodiments that fall within the scope of the spirit of the present invention through additions, modifications, or deletions of components, and these too would fall within the scope of the spirit of the present invention. In the drawings, the shape and size of elements, etc., may be exaggerated for clearer explanation.

[0031] Figure 1 shows an exploded perspective view of a battery pack according to the first embodiment of this specification, and an enlarged view of the connector portion of the battery management system.

[0032] Referring to Figure 1, the battery pack 10 may include a pack housing 11. The pack housing 11 may house a battery management system 13 and battery cells 12, etc.

[0033] The battery pack 10 may include a battery management system 13. The battery management system 13 may include sensing elements for measuring the voltage and temperature of the battery cells 12, and may perform voltage balancing and temperature control functions.

[0034] The battery management system 13 may be mounted in the pack housing 11. The battery management system 13 may be located on one side of the internal space of the pack housing 11. The battery management system 13 may be mounted upright adjacent to one side wall of the pack housing 11. The printed circuit board 14 for the battery management system 13 may be placed inside the pack housing 11 in a vertical position corresponding to the upright mounting of the battery management system 13.

[0035] The battery management system 13 may include a connector 15. The connector 15 may be located on a printed circuit board 14. The connector 15 may be provided at one end of the printed circuit board 14. The connector 15 may be provided in an upright position by the upright position of the printed circuit board 14. The connector 15 may be positioned such that a connection is formed on the side. That is, the connector 15 may be positioned so that a flexible flat cable 100 can be approached or inserted and connected from the side of the printed circuit board 14.

[0036] The battery pack 10 may include a flexible flat cable 100. The flexible flat cable 100 may be connected to the printed circuit board 14 of the 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. On the other hand, the other end of the flexible flat cable 100 may be connected to various sensing components and controllers mounted on the battery management system 13.

[0037] The flexible flat cable 100 can be connected to or inserted into the connector 15 by approaching it from the side of the printed circuit board 14. In this case, the flexible flat cable 100 can be connected to the connector 15 in an upright position, i.e., with both edges of the flexible flat cable 100 facing in the vertical direction, due to the upright position of the connector 15.

[0038] 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 located at the upper end of the printed circuit board 14 with its connection facing upwards, and the flexible flat cable 100 may be connected to or inserted into the connector 15 by approaching it from the top of the printed circuit board 14 in the direction of gravity.

[0039] Figure 2 is a front view of the flexible flat cable of a battery pack according to the first embodiment of this specification. Figure 3 shows a cross-section of the flexible flat cable of a battery pack according to the first embodiment of this specification. Figures 2 and 3 illustrate the case in which the flexible flat cable is connected to the connector horizontally in the battery pack according to the first embodiment of this specification. Figure 4 shows another cross-section of the flexible flat cable of a battery pack according to the first embodiment of this specification. Figure 5 shows the case in which the flexible flat cable is connected to the connector downwards in the battery pack according to the first embodiment of this specification.

[0040] Hereinafter, the flexible flat cable 100 of the battery pack 10 according to the first embodiment of this specification may include a plurality of conductive wires 110, a covering portion 120, and a recessed portion 130, but some of these may be omitted, and other additional configurations are not excluded.

[0041] Referring to Figures 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.

[0042] The flexible flat cable 100 may include a sheathing portion 120. The sheathing portion 120 can cover a plurality of conductive wires 110. Specifically, the sheathing portion 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 rear surfaces of the plurality of conductive wires 110, and in the space between each of the plurality of conductive wires 110. The sheathing portion 120 may be made of a flexible material such as synthetic resin.

[0043] Referring to Figures 2 to 5, the flexible flat cable 100 may include a recessed portion 130. The recessed portion 130 may protrude from or be recessed from the outer surface of the sheathing portion 120. The recessed portion 130 may include a region that extends so as not to be parallel to the longitudinal direction of the plurality of conductive wires 110. The recessed portion 130 blocks the path through which moisture due to condensation flows from the sheathing portion 120 to the connector 15, thereby preventing a short circuit from occurring in the connector 15 due to factors such as moisture.

[0044] As an example of a flexible flat cable 100 for a battery pack according to the first embodiment of this specification, the flexible flat cable 100 may have the following structure.

[0045] The uneven portion 130 has an overall umbrella-like guide structure so that moisture flows in a directional manner, and the inner surface of the umbrella shape faces the terminal side that is combined with the connector 15, and the outer surface faces the opposite side of the terminal that is combined with the connector 15. This can be explained in detail as follows.

[0046] 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, that is, on both sides of the longitudinal corners with respect to the flat surface of the flexible flat cable 100. The first uneven portion 131 may be formed to protrude from the covering portion 120.

[0047] Multiple first protrusions 131 may be provided on each of the edges of the covering portion 120. Through this, moisture can be repeatedly prevented from flowing through the covering portion 120 into the connector 15, thereby effectively preventing short circuits caused by moisture. However, the design is not limited to this, and only one first protrusion 131 may be provided on each of the edges of the covering portion 120.

[0048] Referring to Figure 3, the surface 1311 of the first protrusion 131 facing the battery management system 13 can be tilted so that it faces the battery management system 13 as it moves away from the covering portion 120, that is, it can be tilted toward the terminals connected to the connector 15. In other words, with reference to Figure 3, of the two surfaces constituting the first protrusion 131, the left surface 1311 can be tilted so that it moves closer to the battery management system 13 as it moves further away from the covering portion 120.

[0049] Specifically, as shown in Figure 5, when the flexible flat cable 100 is connected to the connector 15 while approaching the battery management system 13 in the direction of gravity (g), moisture due to condensation can flow along the covering portion 120 in the direction of gravity (g). In this case, if the surface 1311 of the first uneven portion 131 facing the battery management system 13 is tilted so that the further away it is from the covering portion 120, the closer it is to the battery management system 13, it is possible to prevent moisture from flowing over the first uneven portion 131 and then flowing down again along the covering portion 120.

[0050] The uneven portion 130 may include a second uneven portion 132. The second uneven portion 132 may be formed on at least one of the one or the other surface of the covering portion 120. The second uneven portion 132 may extend from 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.

[0051] The second protrusions 132 may be provided in multiple locations. Through these, moisture can be repeatedly prevented from flowing through the covering portion 120 into the connector 15, thereby effectively preventing short circuits caused by moisture. However, the design is not limited to this, and the second protrusions 132 may be provided as a single unit.

[0052] If the second protrusions 132 extends diagonally with respect to the width direction of the flexible flat cable 100, the surface 1311 of the first protrusions 131, which is located at least on the side closer to the battery management system 13, can be tilted so that it approaches the battery management system 13 as it is further from the covering portion 120.

[0053] Specifically, when the second protrusions 132 extend diagonally with respect to the width direction of the flexible flat cable 100, as shown in Figure 5, when the flexible flat cable 100 approaches the battery management system 13 in the direction of gravity (g) and connects to the connector 15, moisture flowing along the covering portion 120 is guided to the left along the second protrusions 132, which are generally formed in an italic shape, and then can reach the first protrusions 131 formed on the side closer to the battery management system 13, among the first protrusions 131 formed at both ends of the second protrusions 132. Therefore, it is preferable that at least the first protrusions 131 on the side closer to the battery management system 13, among the first protrusions 131 provided at both ends of the second protrusions 132, be formed such that the surface 1311 facing the battery management system 13 tilts toward the battery management system as it moves away from the covering portion 120, so that the guided moisture does not travel over the first protrusions 131.

[0054] More preferably, the surfaces 1311 of each of the first protrusions 131 on both sides of the covering portion 120 that face the battery management system 13 can be inclined so that the further away from the covering portion 120 they are, the closer they are to the battery management system 13. Through this, when the flexible flat cable 100 is connected to the connector 15 in the direction of gravity (g) of the battery management system 13 as shown in Figure 5, it is possible to prevent moisture from flowing over the first protrusions 131 and into the connector 15, regardless of which side of the two edges of the covering portion 120 it is guided to.

[0055] On the other hand, referring to Figure 3, the surface 1312 of the first uneven portion 131 that is opposite to the battery management system 13 can be inclined so that it approaches the battery management system 13 as it is further away from the covering portion 120. Through this, the surface 1312 of the first uneven portion 131 that is opposite to the battery management system 13 and the adjacent edge of the covering portion 120 form an obtuse angle with respect to each other, so that moisture flowing in along the covering portion 120 can flow smoothly to the surface 1312 of the first uneven portion 131 that is opposite to the battery management system 13, be guided to the end of the first uneven portion 131, and then be released from the flexible flat cable 100.

[0056] The portion where the surface 1311 of the first protrusion 131 facing the battery management system 13 intersects with the surface 1312 of the first protrusion 131 opposite to the battery management system 13 can be formed as a tip. That is, with reference to Figure 3, it can be understood that the end of the first protrusion 131 is formed as a tip. If, as in Figure 5, the flexible flat cable 100 is connected to the connector 15 approaching the battery management system 13 in the direction of gravity (g), and the portion where the surface 1311 of the first protrusion 131 facing the battery management system 13 intersects with the surface 1312 opposite to the battery management system 13 is formed as a rounded shape, some of the moisture may travel over the first protrusion 131 and then continue to flow along the covering portion 120. Conversely, if the end of the first protrusion 131 is formed as the tip, moisture that has flowed along the surface 1312 opposite to the battery management system 13 of the first protrusion 131 can be easily separated from the flexible flat cable 100 at the end of the first protrusion 131.

[0057] Referring to Figure 4, the surface 1321 of the second uneven portion 132 facing the battery management system 13 can be tilted so that it approaches the battery management system 13 as it is further from the covering portion 120. That is, with reference to Figure 4, of the two surfaces constituting the second uneven portion 132, the left surface 1321 can be tilted so that it approaches the battery management system 13 as it is further from the covering portion 120.

[0058] Specifically, as shown in Figure 5, when the flexible flat cable 100 is connected to the connector 15 while approaching the battery management system 13 in the direction of gravity (g), moisture due to condensation can flow along the covering portion 120 in the direction of gravity (g). In this case, if the surface 1321 of the second uneven portion 132 facing the battery management system 13 is tilted so that it faces the battery management system 13 as it moves away from the covering portion 120, it is possible to prevent moisture from flowing over the second uneven portion 132 and then flowing down again along the covering portion 120.

[0059] The side 1322 of the second protrusion 132 opposite to the battery management system 13 can be tilted so that it faces the battery management system 13 as it moves away from the covering portion 120. Through this, the side 1322 of the second protrusion 132 opposite to the battery management system 13 and one or the other side of the adjacent covering portion 120 form an obtuse angle with each other, so that moisture flowing in along the covering portion 120 can flow smoothly to the side 1322 of the second protrusion 132 opposite to the battery management system 13, be guided to the end of the second protrusion 132, and then be released from the flexible flat cable 100.

[0060] The portion where the surface 1321 of the second uneven portion 132 facing the battery management system 13 intersects with the surface 1322 of the second uneven portion 132 facing the battery management system 13 can be formed as a tip. That is, with reference to Figure 4, it can be understood that the end of the second uneven portion 132 is formed as a tip. Through this, moisture that has flowed along the surface 1322 of the second uneven portion 132 facing the battery management system 13 can easily detach from the flexible flat cable 100 at the end of the second uneven portion 132 without crossing the surface 1321 facing the battery management system 13.

[0061] Referring to Figure 2, the second protrusion 132 can extend diagonally with respect to the width direction of the flexible flat cable 100. The flexible flat cable 100 can be connected to the connector 15 by approaching the battery management system 13 from the side, as shown in Figure 2. In this case, the flexible flat cable 100 can be connected to the connector 15 with the lower end of the second protrusion 132 positioned further away from the battery management system 13 than the upper end. Through this, moisture that travels along the covering 120 towards the battery management system 13 can be blocked by the second protrusion 132 and then fall to the side farther away from the battery management system 13 along the angle of the second protrusion 132.

[0062] The second protrusions 132 may be formed in pairs on both sides of the covering portion 120 so as to correspond to each other. That is, the second protrusions 132 on one side of the covering portion 120 and the second protrusions 132 on the other side of the covering portion 120 may be provided in a mirror-symmetrical manner with respect to each other. In addition, the first protrusions 131 provided on both edges of the covering portion 120 may be formed to connect the ends corresponding to the paired second protrusions 132. In other words, the protrusions 130, including the first protrusions 131 and the second protrusions 132, may be provided to form a closed curve around the covering portion 120. Through such a structure, the protrusions 130 can be formed by attaching a ring-shaped protrusion member to the outer surface of the covering portion 120 and then joining the ring-shaped member and the covering portion 120 to each other, thus making it easy to manufacture a flexible flat cable 100 for preventing moisture from entering the connector 15.

[0063] However, the method of forming the uneven portion 130 is not limited to this. For example, the uneven portion 130 may be injected in a predetermined shape during the injection molding stage of the coating portion 120. Alternatively, if the uneven portion 130 is formed by recession from the coating portion 120, the uneven portion 130 may be formed by applying pressure or heat to the outer surface of the coating portion 120.

[0064] The uneven portion 130 may be made of the same material as the covering portion 120. This is especially true 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 (for example, by a press method).

[0065] Figure 6 is a front view of the flexible flat cable of a battery pack according to the second embodiment of this specification. Figure 7 shows the flexible flat cable shown in Figure 6, but flipped upside down.

[0066] Specifically, Figures 6 and 7 both illustrate the flexible flat cable 200 as viewed from one side of the sheath portion 220. In particular, Figure 6 illustrates the flexible flat cable 200 being connected to the connector 25 of the battery management system 23 located on the left side, while Figure 7 illustrates the flexible flat cable 200 being connected to the connector 25 of the battery management system 23 located on the right side.

[0067] The detailed configuration of the flexible flat cable 200 of the battery pack according to the second embodiment of this specification, which is not described below, may be identical to the detailed configuration of the flexible flat cable 100 of the battery pack according to the first embodiment of this specification.

[0068] In particular, the uneven portion 230 may have an overall umbrella-like guide structure so that moisture flows in a directional manner, with the inner surface of the umbrella shape facing the terminal side that is combined with the connector 15, and the outer surface facing the opposite side of the terminal that is combined with the connector 15. This is the same as the feature of the first embodiment.

[0069] Referring to Figure 6, the second protrusions 232 may be formed in multiples on at least one of the two faces of the covering portion 220. In this case, one of the multiple second protrusions 232 formed on one of the two faces of the covering portion 220 may extend toward one side edge of the covering portion 220 in the width direction, with reference to one direction in the longitudinal direction of the flexible flat cable 200, while the other one may extend toward the other side edge of the covering portion 220 with reference to one direction in the longitudinal direction of the flexible flat cable 200. In other words, the multiple second protrusions 232 can be understood as two second protrusions 232 formed obliquely to the width direction of the flexible flat cable 200, extending obliquely in different directions from one another.

[0070] Through this, regardless of whether the flexible flat cable 200 is connected to the battery management system 23 from the right or from the left, the multiple second protrusions 232 may include second protrusions 232 that are inclined such that the lower ones are positioned further away from the battery management system 23 than the upper ones. For example, in Figure 6, the second second protrusion 232 from the left, and in Figure 7, the first and third second protrusions 232 from the right, can be understood as such. Through this, regardless of the connection direction of the flexible flat cable 200, moisture can be directed to the side farther from the battery management system 23, thereby effectively preventing moisture from entering the connector 25.

[0071] Figure 8 is a front view of the flexible flat cable of a battery pack according to the third embodiment of this specification. Figure 9 shows a cross-section of the flexible flat cable of a battery pack according to the third embodiment of this specification. Figures 8 and 9 illustrate the case in the battery pack according to the third embodiment of this specification in which the flexible flat cable is connected to the connector horizontally. Figure 10 shows another cross-section of the flexible flat cable of the battery pack according to the third embodiment of this specification. Figure 11 shows the case in the battery pack according to the third embodiment of this specification in which the flexible flat cable is connected downwards to the connector.

[0072] The detailed configuration of the flexible flat cable 300 of the battery pack according to the third embodiment of this specification, which is not described below, may be identical to the detailed configuration of the flexible flat cable 100 of the battery pack according to the first embodiment of this specification and the flexible flat cable 200 of the battery pack according to the second embodiment of this specification.

[0073] The difference between the first and second embodiments is that the uneven portion 330 has an umbrella-shaped guide structure so that moisture flows in a direction, but the area of ​​the uneven portion 330 excluding the end on the connector 15 side can be configured such that a valley is formed where moisture collects, with the inner surface of the umbrella shape facing away from the terminals that are combined with the connector 15. This will be explained in detail as follows.

[0074] Referring to Figures 8 and 9, of the first protrusions 331 provided at both ends of the diagonally extending second protrusion 332, the surface 3312 of the first protrusion 331 on the side furthest from the battery management system 33 can be inclined so that it moves further away from the battery management system 33 the further it is from the covering portion 320. Also, referring to Figures 8 and 10, the surface 3312 of the diagonally extending second protrusion 332 on the side furthest from the battery management system 33 can be inclined so that it moves further away from the battery management system 33 the further it is from the covering portion 320.

[0075] In other words, it can be understood that the cross-sectional shape of the first protrusion 331 located on the side closer to the battery management system 33, and the cross-sectional shape of the first protrusion 331 located on the side further from the battery management system 33, and the cross-sectional shape of the second protrusion 332, both located on the sides further from the battery management system 33, are formed in opposite directions. Using the continuous single protrusion 330 in Figure 8 as a reference, the first protrusion 331 located on the side closer to the battery management system 33 is positioned so that the inner surface of the umbrella faces to the left, while the first protrusion 331 and the second protrusion 332 located on the side further from the battery management system 33 are positioned so that the inner surface of the umbrella faces to the right.

[0076] Specifically, as shown in Figure 11, when the flexible flat cable 300 approaches the battery management system 33 in the direction of gravity (g) and connects to the connector 35, moisture flowing along the covering portion 320 in the direction of gravity (g) can be guided to the left side of the first uneven portion 331 by the right side first uneven portion 331 and the second uneven portion 332, and the guided moisture can be separated from the flexible flat cable 300 at the left side first uneven portion 331.

[0077] More specifically, the opposite surfaces 3312 and 3322 of the battery management system 33, respectively, of the first and second uneven portions 331 and 332 on the right side, and the edges and surfaces of the adjacent covering portion, can form acute angles with each other. Therefore, moisture flowing along the surface and right edge of the covering portion 320 cannot pass over the first and second uneven portions 331 and 332 on the right side, and can be guided to the left side of the first uneven portion 331 by traveling through the valley formed between the second uneven portion 332 and the surface of the covering portion 320. Through such a structure, the point of moisture fall can be more easily predicted, and through the proper design of the battery management system 33, short circuits due to moisture can be effectively prevented.

[0078] Furthermore, as shown in Figure 8, even when the flexible flat cable 300 approaches the battery management system 33 from the side and connects to the connector 35, the tip of the first protrusion 331, which is positioned below the direction of gravity (g), faces away from the battery management system 33. As a result, moisture can fall to the side farther from the battery management system 33, thereby effectively preventing short circuits caused by moisture.

[0079] The embodiments described herein or other embodiments described herein are not mutually exclusive or distinct. Any of the embodiments described herein or other embodiments described herein may be used in combination or in combination with each other, depending on their respective configurations or functions.

[0080] For example, this means that configuration A described in a particular embodiment and / or drawing may be combined with configuration B described in another embodiment and / or drawing. That is, even if combinations between configurations are not directly described, it means that combinations are possible unless it is stated that such combinations are impossible.

[0081] The above detailed description should not be constrained in any way and should be considered illustrative. The scope of this specification should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of this specification are included within this specification.

[0082] [Explanation of symbols] 10: Battery Pack 11: Pack Housing 12: Battery Cell 13, 23, 33: Battery Management System 14: Printed circuit board 15, 25, 35: Connectors 100, 200, 300: Flexible flat cable 110: Conductive wire 120, 220, 320: Covering part 130: Uneven part 131, 331: First uneven part 1311, 3311: Surface of the first uneven section facing the battery management system 1312, 3312: Opposite side of the battery management system of the first uneven section 132, 232, 332: Second uneven part 1321, 3321: Sides of the second uneven section facing the battery management system 1322, 3322: Opposite side of the battery management system in the second uneven section

Claims

1. Pack housing and A printed circuit board for a battery management system to be mounted in the aforementioned pack housing, Includes a flexible flat cable connected to the printed circuit board, The aforementioned flexible flat cable is Multiple conductive wires arranged side by side, A covering portion that covers the plurality of conductive wires, A battery pack comprising: an uneven portion that protrudes from or recesses from the outer surface of the covering portion, but includes a region that extends so as not to be parallel to the longitudinal direction of the plurality of conductive wires.

2. The battery pack according to claim 1, wherein the uneven portion includes a first uneven portion provided on each of the widthwise edges of the covering portion, and a second uneven portion extending from between the first uneven portions provided on each of the widthwise edges of the covering portion on at least one of one of the surfaces of the covering portion and the other surface.

3. The first uneven portion is formed protruding from the covering portion, The battery pack according to claim 2, wherein the surface of the first uneven portion facing the battery management system is inclined to move closer to the battery management system as it is further away from the covering portion.

4. The surface of the first uneven portion opposite to the battery management system is inclined so that it approaches the battery management system as it is further away from the covering portion. The battery pack according to claim 3, wherein the portion where the surface of the first uneven portion facing the battery management system and the surface opposite the battery management system intersect is formed as a tip.

5. The second uneven portion is formed protruding from the covering portion, The battery pack according to any one of claims 2 to 4, wherein the surface of the second uneven portion facing the battery management system is inclined to move closer to the battery management system as it is further away from the covering portion.

6. The side of the second uneven portion opposite to the battery management system is inclined so that it approaches the battery management system as it is further away from the covering portion. The battery pack according to claim 5, wherein the portion where the surface of the second uneven portion facing the battery management system and the surface opposite the battery management system intersect is formed as a tip.

7. The battery pack according to any one of claims 2 to 4, wherein the second uneven portion extends diagonally with respect to the width direction of the flexible flat cable.

8. The battery pack according to claim 7, wherein the surface of the first protrusions, which is provided at both ends of the diagonally extending second protrusions, and which is provided on the side closer to the battery management system, is inclined to move closer to the battery management system as it is further away from the covering portion.

9. The battery pack according to claim 7, wherein, of the first protrusions provided at both ends of the diagonally extending second protrusions, the side of the first protrusion that is provided on the side farther from the battery management system is inclined so as it is further from the covering, it moves away from the battery management system.

10. The battery pack according to claim 9, wherein the side of the diagonally extending second protrusions opposite to the battery management system is inclined to move further away from the battery management system as it is further away from the covering portion.

11. The second uneven portion is formed in multiple locations on at least one of the surfaces of the covering portion, The battery pack according to any one of claims 2 to 4, wherein one of the plurality of second protrusions formed on either one surface or the other surface of the covering portion extends toward one edge of the covering portion with reference to one direction in the longitudinal direction of the flexible flat cable, and the other one extends toward the other edge of the covering portion with reference to one direction in the longitudinal direction of the flexible flat cable.

12. The second uneven portion is formed in pairs on both sides of the covering portion so as to correspond to each other. The battery pack according to any one of claims 2 to 4, wherein the first protrusions are formed to connect the ends corresponding to the pair of second protrusions.

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