WO2023130621A1

WO2023130621A1 - Circuit board assembly, battery, and electric device

Info

Publication number: WO2023130621A1
Application number: PCT/CN2022/088470
Authority: WO
Inventors: 甘卫锋; 郑陈铃; 王冲; 高宇; 陈智明
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-01-06
Filing date: 2022-04-22
Publication date: 2023-07-13
Also published as: CN216903497U

Abstract

Embodiments of the present application provide a circuit board assembly, a battery, and an electric device. The circuit board assembly of the present application comprises a flexible circuit board, a connector, a fixing plate, and a waterproof cover. The connector comprises a connector main body and a connecting part. The connector main body is electrically connected to the flexible circuit board by means of the connecting part. The fixing plate is connected to the flexible circuit board. The waterproof cover is connected to the fixing plate and the connector and covers the connecting part and at least part of the fixing plate. By means of such design, external water drops are effectively prevented from entering the connecting part, and abnormal communication between the circuit board assembly and the connector is avoided.

Description

Circuit board assembly, battery and electrical device

Cross References to Related Applications

This application claims priority to the Chinese patent application 202220025739.8 filed on January 06, 2022, entitled "Circuit Board Components, Batteries, and Electrical Devices", the entire content of which is incorporated herein by reference.

technical field

The present application relates to the technical field of batteries, in particular to a circuit board assembly, a battery and an electrical device.

Background technique

With the vigorous development of electric vehicles in recent years, in order to meet the high-power applications of electric vehicles, the power battery is usually composed of multiple battery modules, and the battery module is composed of multiple battery cells. The power battery uses the circuit board to sample the battery cells in the battery module to monitor the working conditions of the battery cells in real time. The voltage signal and temperature signal collected by the circuit board are transmitted to the external monitoring mechanism through the connector.

At present, the electrical connection between the connector and the circuit board is realized by welding. In order to effectively realize the waterproofing of the connecting portion of the two, the prior art uses waterproof glue to completely wrap the connecting portion. However, the area for dispensing glue in the above method is large, resulting in high manufacturing cost and low production efficiency. Therefore, how to reduce the cost of waterproofing at the connection between the connector and the circuit board has become an urgent problem to be solved.

Contents of the invention

In view of the above problems, the present application provides a circuit board assembly, a battery and an electrical device, which can effectively realize waterproof between the connector and the circuit board, and have low manufacturing cost.

In a first aspect, the present application provides a circuit board assembly, including a flexible circuit board, a connector, a fixing plate and a waterproof cover. The connector includes a connector body and a connection part, and the connector body is electrically connected to the flexible circuit board through the connection part. The fixed board is connected with the flexible circuit board. The waterproof cover is connected with the fixing plate and the connector, and covers the connecting part and at least part of the fixing plate.

In the technical solution of the embodiment of the present application, a waterproof cover is installed on the connection part of the circuit board assembly, and the waterproof cover completely covers the connection part and at least part of the fixing plate. Such a design effectively prevents external water vapor from entering the connection portion, and avoids abnormal communication between the circuit board assembly and the connector.

In some embodiments, the flexible circuit board includes a flexible circuit board body and a bent portion connected to the flexible circuit board body. The bending part includes a first arm, a second arm and a bending area, the first arm is connected to the main body of the flexible circuit board, and the bending area is connected to the first arm and the second arm. A part of the fixing plate is arranged in the bending part and fits with the first arm and the second arm. The connector is arranged on a side of the second arm away from the fixing plate. The waterproof cover is arranged on the side of the fixing plate close to the second arm. The bending design of the flexible circuit board forms a bent portion for accommodating the fixing board, so that the connection between the fixing board and the flexible circuit board is more firm. The setting of the fixing plate is convenient for installing the waterproof cover on the flexible circuit board.

In some embodiments, a drainage groove is provided on the surface of the fixing plate located in the waterproof cover, and at least one drainage hole penetrating through the fixing plate is provided in the drainage groove. The condensed water generated inside the waterproof cover can be collected by setting the drainage groove, and the drainage hole can discharge the accumulated water in the drainage groove in time. In addition, due to the small size of the drain hole, external water vapor will not enter the interior of the circuit board assembly through the drain hole.

In some embodiments, the fixing plate is provided with a mounting hole, and the waterproof cover is provided with an insertion part, and the insertion part is detachably connected to the installation hole. The fixing of the waterproof cover in the second direction is realized through the fixed connection between the installation hole and the socket part.

In some embodiments, a rib is provided on the side of the connector body away from the second arm, and a step is formed inside the waterproof cover, and the step is engaged with the rib to limit the position of the waterproof cover in a direction parallel to the fixing plate. The first direction moves away from the connector. The engagement between the rib and the stepped portion makes the connection between the waterproof cover and the connector main body stronger, and limits the movement of the waterproof cover in the first direction.

In some embodiments, the stepped portion abuts against a side of the connector body away from the second arm. The close fit between the stepped portion and the main body of the connector can effectively prevent water vapor from entering the interior of the waterproof cover from the connection interface between the two.

In some embodiments, there is a gap between the rib and the inner surface of the waterproof cover. The existence of the gap can prevent the waterproof cover from being lifted up by the rib, thereby effectively improving the sealing performance of the connection between the rib and the step portion.

In some embodiments, an abutting portion parallel to the fixing plate is provided inside the waterproof cover, and a stopper is provided on the end surface of the connector body facing the inside of the waterproof cover, and the stopper abuts against the abutting portion to limit the waterproof The cover moves away from the fixed plate in a second direction perpendicular to the fixed plate. By providing the abutting portion and the stop portion, the waterproof cover is fixed in the first direction, and the movement of the waterproof cover in the second direction is effectively restricted.

In some embodiments, a block is provided on the end surface of the connector body, and a slot is provided on the abutting portion, and the block engages with the slot to restrict the movement of the waterproof cover in the third direction parallel to the fixing plate. , the third direction is perpendicular to the first direction. The movement of the waterproof cover in the third direction is effectively restricted by providing the clamping block and the clamping slot, thereby improving the installation firmness of the waterproof cover.

In a second aspect, the present application provides a battery, which includes the circuit board assembly of any one of the above embodiments.

In a third aspect, the present application provides an electric device, which includes the battery in the above embodiment, and the battery is used to provide electric energy.

The circuit board assembly, battery, and electrical device provided in the embodiments of the present application, by installing a waterproof cover on the flexible circuit board assembly, can effectively prevent external water vapor from entering the connection part, and avoid damage caused by water vapor between the connector and the circuit board assembly. Communication is abnormal. At the same time, the fixed plate is provided with drain grooves and drain holes, which can timely discharge the condensed water inside the circuit board assembly due to heat diffusion resistance. The above-mentioned waterproof cover has a simple structure and is easy to manufacture, and not only can achieve a good waterproof sealing effect, but also has a lower cost than existing connector waterproof solutions.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

FIG. 1 is a schematic structural view of a circuit board assembly disclosed in an embodiment of the present application;

Fig. 2 is the sectional structural schematic diagram that Fig. 1 is made along A-A line;

Fig. 3 is a partial enlarged view at B of Fig. 2;

Fig. 4 is an exploded view of a circuit board assembly disclosed in an embodiment of the present application;

Fig. 5 is a partial structural schematic diagram of a circuit board assembly disclosed in an embodiment of the present application;

Fig. 6 is a schematic structural diagram of a waterproof cover disclosed in an embodiment of the present application;

Fig. 7 is a top view of a partial structure of a circuit board assembly disclosed in an embodiment of the present application;

Fig. 8 is a schematic diagram of assembly of a circuit board assembly disclosed in an embodiment of the present application;

In the drawings, the drawings are not drawn to scale.

Marking description: 10-circuit board assembly; 1-flexible circuit board; 11-flexible circuit board main body; 12-bending part; 121-first arm; 122-second arm; 123-bending area; 2-connector ;21-connector main body; 211-convex rib; 212-stopper; 213-block; 22-connection; 3-fixed plate; 31-drainage groove; Waterproof cover; 41-socket part; 42-step part; 43-gap; 44-contact part; 45-card slot; X-first direction; Y-second direction; Z-third direction.

Detailed ways

Embodiments of the technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present application more clearly, and therefore are only examples, rather than limiting the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the application; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to To limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the description of the above drawings are intended to cover a non-exclusive inclusion.

In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and should not be understood as indicating or implying relative importance or implicitly indicating the number, specificity, or specificity of the indicated technical features. Sequence or primary-secondary relationship. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise specifically defined.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiment of the present application, the term "and/or" is only a kind of association relationship describing associated objects, which means that there may be three kinds of relationships, such as A and/or B, which may mean: A exists alone, and A exists at the same time and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two), and "multiple pieces" refers to More than two pieces (including two pieces).

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical" "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", "Radial", "Circumferential", etc. indicate the orientation or positional relationship based on the drawings Orientation or positional relationship is only for the convenience of describing the embodiment of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as an implementation of the present application. Example limitations.

In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a fixed connection. Disassembled connection, or integration; it can also be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. With the continuous expansion of power battery application fields, its market demand is also constantly expanding. In order to meet the actual needs of some high-power applications such as electric vehicles, multiple battery cells are connected in series and/or in parallel to form a battery module. device. With the development of technology, the level of the battery module can be omitted, that is, the battery pack is formed directly from the battery cells.

The safety performance of battery cells in battery modules and battery packs directly affects the safety of the entire power battery, so real-time monitoring of the working conditions of battery cells is required. Usually, a circuit board assembly is arranged in the battery module and/or the battery pack, so as to realize the collection of electrical signals and/or temperature signals of the battery cells. During the sampling process, in order to realize the information interaction between the circuit board components inside the battery module and/or battery pack and the outside world (such as battery management control system, BMS), it is necessary to set a connector on the circuit board components. In one aspect, the main body of the connector is mounted on the circuit board assembly and electrically connected to the wires on the circuit board assembly. On the other hand, the output end of the connector and the input end of the corresponding connector of the external device realize information interaction through plugging.

The applicant noticed that the connector and the flexible circuit board are connected together by welding, and the connecting portion of the two usually protrudes from the main body of the connector, that is, the connecting portion is exposed to the external environment. In this way, when the environment is humid, external water droplets may drop on the connection part, thereby affecting signal transmission. For this reason, in the prior art, waterproof glue is used to cover the entire connecting portion to achieve waterproofing of the external environment. However, this method requires dispensing and curing steps to complete, which increases the production process and reduces production efficiency. In addition, due to the larger area of the dispensing area, the cost is higher.

In order to solve the problem of high cost of waterproofing the connector, the applicant has found through research that a waterproof cover and a fixing plate can be provided on the circuit board assembly to realize the waterproof function. Specifically, a waterproof cover with an arc structure is provided, one end of the waterproof cover is installed on the connector, and the other end is installed on the fixing plate of the circuit board assembly, so that the waterproof cover completely covers the connecting part of the connector and the flexible circuit board . Such a design isolates the connection part from the external environment and prevents moisture from dripping into the connection part. Compared with the existing method of covering waterproof glue, the cost of installing the waterproof cover is lower.

The applicant further researched and found that in such a circuit board assembly, although the waterproof cover realizes the waterproofing to the outside, the waterproof cover hinders the heat dissipation inside the connector to a certain extent. In this way, when the temperature of the battery module and/or the battery pack is high, the temperature of the connector increases accordingly, so that the temperature of the gas in the enclosed space formed by the waterproof cover and the connector increases. If the external ambient temperature is low at this time, the above-mentioned high-temperature gas will condense on the inner wall of the waterproof cover to form condensed water. If the water droplets cannot be discharged from the inside of the waterproof cover in time, they may drop on the connection part and affect the signal transmission. Based on the above considerations, at least one drainage groove is arranged on the fixing plate to facilitate the accumulation of condensed water. At the same time, a drainage hole through the fixed plate is set on the drainage groove to discharge the accumulated condensed water in time.

The circuit board assembly of the present application is equipped with a waterproof cover on the connector, which effectively prevents external water droplets from entering the connection part, and is also equipped with drainage grooves and drainage holes to timely discharge the condensed water generated inside the connector. The structure of the waterproof cover is simple and easy to manufacture, which can reduce the cost of waterproofing the connection between the connector and the flexible circuit board.

The circuit board assembly disclosed in the embodiments of the present application can be used in battery modules and battery packs, but not limited to. It can also be used in an electric device using the battery module and the battery pack disclosed in this application as a power source. Wherein, the electrical device may be, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and the like. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

According to some embodiments of the present application, referring to FIG. 1, and further referring to FIGS. 2 to 8, FIG. 1 is a schematic structural view of a circuit board assembly disclosed in an embodiment of the present application, and FIG. 2 is a cross-section taken along line A-A in FIG. 1 Structural schematic diagram, Figure 3 is a partial enlarged view of Figure 2 at B, Figure 4 is an exploded view of a circuit board assembly disclosed in an embodiment of the application, and Figure 5 is a partial structural diagram of a circuit board assembly disclosed in an embodiment of the application , Fig. 6 is a schematic structural view of a waterproof cover disclosed in an embodiment of the present application, Fig. 7 is a top view of a departmental structure of a circuit board assembly disclosed in an embodiment of the present application, and Fig. 8 is a schematic view of a circuit board assembly disclosed in an embodiment of the present application Assembly schematic.

As shown in the figure, the X direction in the figure is the first direction, the Y direction is the second direction, and the Z direction is the third direction.

The present application provides a circuit board assembly 10 , including a flexible circuit board 1 , a connector 2 , a fixing plate 3 and a waterproof cover 4 . The connector 2 includes a connector body 21 and a connecting portion 22 , and the connector body 21 is electrically connected to the flexible circuit board 1 through the connecting portion 22 . The fixing board 3 is connected with the flexible circuit board 1 . The waterproof cover 4 is connected with the fixing board 3 and the connector 2 , and covers the connecting portion 22 and at least part of the fixing board 3 .

The circuit board assembly 10 is a component for transmitting electrical signals and/or temperature signals of battery cells in a battery module or battery pack. The circuit board assembly 10 gradually replaces the upper wire harness of the traditional wire harness isolation board due to advantages such as high speed, multi-function, large capacity, small volume, and thinning.

The flexible circuit board 1 or circuit board is a provider of electrical connections for electronic components. The flexible circuit board 1 makes the circuit miniaturized and intuitive, and plays an important role in mass production of fixed circuits and optimizing the layout of electrical appliances. Flexible circuit board 1 is a highly reliable and flexible circuit board made of polyimide or polyester film as the base material. It has high wiring density, light weight, thin thickness and good bendability. specialty. The working principle of the flexible circuit board 1 is to use the insulating material to isolate the conductive layer of the surface copper foil, so that the current flows along the pre-designed circuit in various components to achieve such as work, amplification, attenuation, modulation, demodulation, encoding, etc. and other functions. Flexible printed circuit boards can be divided into single-sided, double-sided and multi-layer boards. The surface layer and the inner layer conductor of the double-sided, multi-layer flexible circuit board 1 realize the electrical connection of the inner and outer layer circuits through metallization. The functions of the flexible circuit board 1 can be divided into four types, which are lead wires, printed circuits, connectors and multi-functional integration systems.

Further, in the field of battery technology, one end of the wire on the flexible circuit board 1 is electrically connected to the busbar on the battery cell for collecting electrical signals and/or temperature signals on the busbar. The other end of the wire is welded to the connector 2, and the collected signal is transmitted to the connector 2. The output end of the above-mentioned connector 2 is mated with another connector connected to the outside of the battery module or battery pack (such as a battery management control system, BMS), so as to transmit the collected signal to the outside.

The connector 2 is also called a connector, and refers to a component that connects two active devices and transmits current and/or signals between the two active devices. Specifically, a male connector with pins is installed on one active device, and a female connector with a jack is installed on the other active device. The male and female connectors of the connector can be plugged together to realize the connection of two active devices. In this application, the connector 2 may be a male or a female. For example, referring to FIG. 1 , the connector 2 is a female head with a socket. The size of the connector 2 is set according to the size of the flexible circuit board 1 , which is not limited in the present application. The connector 2 includes a connector body part 21 and a connecting part 22. The connector body 21 is made of insulating material, such as nylon, polyester plastic, polycarbonate plastic and the like.

The connecting portion 22 is a component for electrically connecting the connector 2 and the flexible circuit board 1 . Exemplarily, referring to Fig. 2, Fig. 4 and Fig. 5, the connecting part 22 is Z-shaped, and one end goes deep into the connector body 21, and is connected with the external equipment; Soldering together realizes the signal transmission between the flexible circuit board 1 and the connector 2 . The connection part 22 can be made of metal alloy, such as brass, phosphor bronze, beryllium bronze and so on.

The fixing board 3 is also called a strengthening board, and is widely used in the flexible circuit board 1 of electronic products. The fixing plate 3 mainly solves the flexibility of the flexible circuit board 1 , improves the strength of the connecting parts, and facilitates the overall assembly of the product. The fixing plate 3 can be made of stainless steel, aluminum foil, polyester, polyimide, glass fiber, polytetrafluoroethylene, polycarbonate and other materials.

The waterproof cover 4 is a member capable of preventing external water droplets from entering the connection portion 22 . Waterproof cover 4 can be made of materials such as polyester, polyimide, polycarbonate. The shape of the waterproof cover 4 is not limited in the embodiment of the present application, as long as it can completely cover the connecting portion 22 . For example, referring to FIG. 6 , the waterproof cover 4 is arc-shaped.

In the technical solution of the embodiment of the present application, the waterproof cover 4 is installed on the connection part 22 of the circuit board set 10, and the waterproof cover 4 completely covers the connection part 22 and at least part of the fixing plate 3 . Such a design effectively prevents external water droplets from entering the connecting portion 22 and avoids abnormal communication between the circuit board assembly 10 and the connector 2 .

According to some embodiments of the present application, referring to FIG. 1 and FIG. 2 , a flexible circuit board 1 includes a flexible circuit board main body 11 and a bent portion 12 connected to the flexible circuit board main body 11 . The bending part 12 includes a first arm 121 , a second arm 122 and a bending area 123 , the first arm 121 is connected with the FPC main body 11 , and the bending area 123 is connecting the first arm 121 and the second arm 122 . A part of the fixing plate 3 is disposed in the bending portion 12 and attached to the first arm 121 and the second arm 122 . The connector 2 is disposed on a side of the second arm 122 away from the fixing plate 3 . The waterproof cover 4 is disposed on a side of the fixing plate 3 close to the second arm 122 .

The main body 11 of the flexible circuit board refers to the part connected to the battery module, and mainly includes two parts: lead lines (such as wires) and printed circuits.

The bent portion 12 refers to a portion with a receiving space formed by bending the end of the flexible circuit board 1 and extending in the horizontal direction (ie, the X direction). The first arm 121 refers to the part where the bending part 12 is connected to the main body 11 of the flexible circuit board, the second arm 122 refers to the part where the bending part 12 is in contact with the connector 2, and the bending area 123 is to connect the first arm 121 and the second arm 121. part of the second arm 122 .

Further, the upper surface of the fixing plate 3 is connected to the lower surface of the second arm 122 . The lower surface of the connector 2 is connected to the upper surface of the second arm 122 . The above connection manner may be bonding, welding, etc., which is not limited in this embodiment of the present application. The waterproof cover 4 is fixed through the mounting hole 33 on the upper surface of the fixing plate 3 .

In the technical solution of the embodiment of the present application, the bending design of the flexible circuit board 1 forms a bent portion 12 for accommodating the fixing board 3 so that the connection between the fixing board 3 and the flexible circuit board 1 is more firm. The setting of the fixing plate 3 is convenient for installing the waterproof cover 4 on the flexible circuit board 1 .

According to some embodiments of the present application, referring to Fig. 4, Fig. 5 and Fig. 7, a drainage groove 31 is arranged on the surface of the fixing plate 3 located in the waterproof cover 4, and at least one penetrating fixing plate 3 is arranged in the drainage groove 31 The drainage hole 32.

The drainage groove 31 is a groove formed by indenting downward on the upper surface of the fixing plate 3 , and the shape of the drainage groove 31 may be a rectangle, a square, etc., which is not limited in this embodiment of the present application. The depression depth of the drainage groove 31 is not limited in this application, but the drainage groove 31 cannot penetrate the fixing plate 3 . For example, referring to FIG. 7 , there are three drainage grooves 31 , and they are arranged on three sides of the contact surface between the fixing plate 3 and the end of the flexible circuit board 1 close to the flexible circuit board 1 . The drainage grooves 31 arranged at intervals can accumulate condensed water generated in different positions inside the waterproof cover 4 .

The drainage hole 32 is a through hole provided in the drainage groove 31 , and the position, size and quantity of the drainage hole 32 are not limited in this application, as long as the water accumulated in the drainage groove 31 can be discharged.

In the technical solution of the embodiment of the present application, the condensed water generated inside the waterproof cover 4 can be collected by setting the drainage groove 31 , and the drainage hole 32 can discharge the accumulated water in the drainage groove 31 in time. In addition, since the size of the drain hole 32 is small, external water vapor will not enter the interior of the circuit board assembly 10 through the drain hole 32 .

According to some embodiments of the present application, referring to FIG. 4 , FIG. 5 , FIG. 6 , FIG. 7 and FIG. 8 , the fixing plate 3 is provided with a mounting hole 33 , and the waterproof cover 4 is provided with an insertion portion 41 . The mounting hole 33 is detachably connected.

The mounting holes 33 are through holes or blind holes provided on the fixing plate 3 , and the number of the mounting holes 33 is set according to actual needs, which is not limited in this embodiment of the present application. Exemplarily, please continue to refer to FIG. 5 , there are two mounting holes 33 . The mounting hole 33 is provided at one end close to the connecting portion 22 .

The insertion part 41 is a component for fixing the waterproof cover 4 in the Y direction, and the number, size and shape of the insertion part 41 are compatible with the installation hole 33, which is not limited in this application. Exemplarily, referring to FIG. 6 , the insertion portion 41 is columnar and there are two in number. The inserting part 41 can be made of polyester, polyimide, polycarbonate and other materials. The connection between the socket part 41 and the mounting hole 33 can be interference fit, clearance fit, etc. In order to improve the sealing effect of the waterproof cover 4, a plurality of insertion parts 41 can be arranged at intervals in the Z direction. Correspondingly, a plurality of installation holes 33 are provided on the fixed plate 3, and one insertion part 41 and one installation hole 33 are detachable. connect. The insertion portion 41 is integrally formed with the waterproof cover 4 .

In the technical solution of the embodiment of the present application, the waterproof cover 4 is fixed in the second direction through the fixed connection between the installation hole 33 and the socket part 41 .

According to some embodiments of the present application, referring to FIG. 2 and FIG. 3 , a rib 211 is provided on the side of the connector body 21 away from the second arm 122 , and a stepped portion 42 is formed inside the waterproof cover 4 , and the stepped portion 42 is connected to the convex portion. The rib 211 is snap-connected to limit the waterproof cover 4 from moving away from the connector 2 in a first direction parallel to the fixing plate 3 .

The rib 211 refers to a convex portion formed by protruding upward from a part of the upper surface of the connector main body 21 as a whole. The step portion 42 is a step-like structure formed by a part of the inner wall of the waterproof cover 4 being recessed upwards and formed with an unrecessed portion.

Further, the recessed area of the step part 42 is in contact with the convex part of the rib 211, and the unrecessed part of the step part 42 is in contact with the non-protruding area of the connector body 21, thereby realizing the connection between the step part 42 and the rib 211. Snap connection. When the waterproof cover 4 moves away from the connector 2 in the first direction (that is, the X direction in the figure), due to the existence of the rib 211, the movement of the waterproof cover 4 is restricted, thereby improving the installation of the waterproof cover 4 Firmness.

In the technical solution of the embodiment of the present application, the engagement between the rib 211 and the step portion 42 makes the connection between the waterproof cover 4 and the connector main body 21 stronger, and limits the movement of the waterproof cover 4 in the first direction. .

According to some embodiments of the present application, referring to FIG. 2 and FIG. 3 , the stepped portion 42 abuts against the side of the connector body 21 away from the second arm 122 .

"The step portion 42 abuts against the side of the connector body 21 away from the second arm 122" means that the waterproof cover 4 presses the step portion 42 against the upper surface of the connector body 21 due to the action of gravity, and the two are in contact. There is no gap.

In the technical solution of the embodiment of the present application, the close fit between the step portion 42 and the connector main body 21 can effectively prevent water droplets from entering the interior of the waterproof cover 4 from the connection interface.

According to some embodiments of the present application, referring to FIG. 2 and FIG. 3 , there is a gap 43 between the rib 211 and the inner surface of the waterproof cover 4 .

Since the raised height of the rib 211 is smaller than the sunken depth of the inner surface of the waterproof cover 4 , there is a gap 43 between them. In this way, the inner surface of the waterproof cover 4 will not be subjected to the force of the connector 2, so the waterproof cover 4 will not move away from the connector 2 in the second direction (that is, the Y direction), so it will not affect The firmness of waterproof cover 4 installation.

In the technical solution of the embodiment of the present application, the existence of the gap 43 can prevent the waterproof cover 4 from being lifted up by the rib 211 , thereby effectively improving the sealing performance of the connection between the rib 211 and the stepped portion 42 .

According to some embodiments of the present application, referring to FIG. 2 , FIG. 5 and FIG. 6 , there is also an abutting portion 44 parallel to the fixing plate 3 inside the waterproof cover 4 , and the end surface of the connector body 21 facing the inside of the waterproof cover 4 is provided with The stopper portion 212 abuts against the abutment portion 44 to limit the waterproof cover 4 from moving away from the fixed plate 3 in a second direction perpendicular to the fixed plate 3 .

The abutting portion 44 is a component for fixing the waterproof cover 4 in the X direction, and the size, shape and quantity of the abutting portion 44 are set according to actual application scenarios, which is not limited in this application. The abutting portion 44 can be made of polyester, polyimide, polycarbonate and other materials. The contact portion 44 is integrally formed with the waterproof cover 4 .

The stop portion 212 is an accommodating portion formed by inwardly indenting the connector main body 21 in the X direction. The size, shape and quantity of the stopper portion 212 are adapted to the abutment portion 44 , which is not limited in the present application. For example, referring to FIG. 5 , there are two stoppers 212 in rectangular shape, and the two stoppers 212 are arranged at intervals. The connection between the abutment portion 44 and the stopper portion 212 may be interference fit, clearance fit, etc. FIG.

Further, after the assembly of the abutting portion 44 and the stop portion 212 is completed, when the waterproof cover 4 moves along the Y direction away from the connector 2, the movement of the abutting portion 44 is hindered by the stop portion 212, thereby limiting The further movement of the waterproof cover 4 is ensured, thereby improving the installation firmness of the waterproof cover 4 in the Y direction.

In the technical solution of the embodiment of the present application, the fixing of the waterproof cover 4 in the first direction is realized and the movement of the waterproof cover 4 in the second direction is effectively restricted by providing the abutting portion 44 and the stopper portion 212 .

According to some embodiments of the present application, referring to FIG. 5 and FIG. 6 , a block 213 is also provided on the end surface of the connector body 21 , and a slot 45 is provided on the abutting portion 44 , and the block 213 is engaged with the slot 45 , so as to limit the movement of the waterproof cover 4 along a third direction parallel to the fixing plate 3 , and the third direction is perpendicular to the first direction.

The locking block 213 is a block structure disposed in the middle of the stop portion 212 . The locking groove 45 is a groove formed in the middle of the abutting portion 44 . The position, size and shape of the locking block 213 are adapted to the locking slot 45, which is not limited in this embodiment of the present application.

Further, when the waterproof cover 4 is assembled on the connector 2 , the locking block 213 is in contact with the locking slot 45 . When the waterproof cover 4 moves along the Z direction, the movement of the locking groove 45 is hindered by the block 213 , thereby restricting further movement of the waterproof cover 4 , thereby improving the installation firmness of the waterproof cover 4 in the Z direction.

In the technical solution of the embodiment of the present application, the movement of the waterproof cover 4 in the third direction is effectively restricted by setting the locking block 213 and the locking groove 45 , thereby improving the installation firmness of the waterproof cover 4 .

According to some embodiments of the present application, please continue to refer to FIG. 1 to FIG. 8, the present application provides a circuit board assembly 10, please continue to refer to FIG. The sectional view after assembly can therefore reflect the assembly details of the waterproof cover 4 . The arc-shaped waterproof cover 4 completely covers the connecting portion 22, effectively preventing the entry of external water vapor. The end of the connector 2 away from the connecting portion 22 is provided with a socket, which can be mated with a connector with corresponding pins on the battery management system, so as to transmit the signal collected by the circuit board assembly 10 to the outside. On the one hand, the connection between the insertion part 41 of the waterproof cover 4 and the installation hole 33 at the corresponding position of the fixed plate 3, and the engagement between the rib 211 of the connector 2 and the step part 42 realizes the waterproof cover 4 in the Y direction. fixed. On the other hand, the connection of the abutting portion 44 and the stopper portion 212 realizes the fixing of the waterproof cover 4 in the X direction and the limitation in the Y direction. In addition, the locking slot 45 on the waterproof cover 4 is inserted into the locking block 213 on the connector 2 to realize the position limitation of the waterproof cover 4 in the Z direction. In summary, the waterproof cover 4 can be firmly assembled on the fixing plate 3 and the connector 2 . Since the waterproof cover 4 hinders the heat diffusion inside the connector 2 to a certain extent, the gas in the inner space of the waterproof cover 4 may condense to form water droplets, thereby causing the signal transmission failure of the connecting portion 22 . For this reason, on the fixing plate 3, a drain groove 31 for accumulating condensed water and a drain hole 32 for discharging condensed water are provided. Due to the small size of the drain hole 32 , external water vapor will not enter the interior of the waterproof cover 4 through the drain hole 32 . Compared with the existing solution of applying glue to waterproof the connection part 22, the waterproof cover 4 provided by the embodiment of the present application has a simple structure, is easy to manufacture, and reduces the waterproof cost of the joint between the connector 2 and the flexible circuit board 1 .

According to a second aspect of the present application, a battery is provided, which includes the circuit board assembly 10 of any one of the above-mentioned embodiments. In the battery of this embodiment, the circuit board assembly 10 is electrically connected to the battery cells in the battery, and transmits the electrical signal and/or temperature signal of the battery cells to the battery management system

In the technical solution of the embodiment of the present application, the waterproof cover 4 is installed on the connecting portion 22 of the circuit board assembly 10 , and the waterproof cover 4 completely covers the connecting portion 22 . Such a design effectively prevents external water droplets from entering the connecting portion 22 and avoids abnormal communication between the flexible circuit board 1 and the connector 2 .

According to a third aspect of the present application, there is provided an electric device, which includes the battery in the above embodiment, and the battery is used to provide electric energy.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A circuit board assembly, comprising:

flexible circuit board;

A connector, including a connector body and a connecting portion; the connector body is electrically connected to the flexible circuit board through the connecting portion;

a fixing plate connected to the flexible circuit board;

The waterproof cover is connected with the fixing plate and the connector, and covers the connecting portion and at least part of the fixing plate.
The circuit board assembly according to claim 1, wherein the flexible circuit board comprises a flexible circuit board body and a bent part connected to the flexible circuit board body; the bent part comprises a first arm, a second arm and a bent part A bending area, the first arm is connected to the main body of the flexible circuit board, and the bending area is connected to the first arm and the second arm; a part of the fixing plate is arranged in the bending portion and connected to the The first arm is attached to the second arm; the connector is arranged on a side of the second arm away from the fixing plate; the waterproof cover is arranged on the fixing plate close to the second arm side.
The circuit board assembly according to claim 2, wherein a drainage groove is provided on the surface of the fixing plate located in the waterproof cover; at least one drainage hole penetrating through the fixing plate is provided in the drainage groove.
The circuit board assembly according to any one of claims 1-3, wherein, the fixing plate is provided with a mounting hole, and the waterproof cover is provided with an inserting portion, and the inserting portion and the mounting hole can be connected to each other. Disconnect the connection.
The circuit board assembly according to claim 4, wherein a rib is provided on the side of the connector body away from the second arm, a step is formed inside the waterproof cover, and the step is connected to the second arm. The ribs are snap-connected to limit the movement of the waterproof cover away from the connector in a first direction parallel to the fixing plate.
The circuit board assembly according to claim 5, wherein the stepped portion abuts against a side of the connector body away from the second arm.
The circuit board assembly according to claim 5 or 6, wherein a gap is provided between the rib and the inner surface of the waterproof cover.
The circuit board assembly according to any one of claims 5-7, wherein an abutting portion parallel to the fixing plate is further provided in the waterproof cover, and the part of the connector body facing the inside of the waterproof cover A stopper is provided on the end surface, and the stopper abuts against the abutment to limit the movement of the waterproof cover away from the fixation plate in a second direction perpendicular to the fixation plate.
The circuit board assembly according to claim 8, wherein a locking block is further provided on the end surface of the connector body, and a locking slot is provided on the abutting portion, and the locking block and the locking slot engage The waterproof cover is limited to move in a third direction parallel to the fixing plate, and the third direction is perpendicular to the first direction.
A battery, comprising the circuit board assembly according to any one of claims 1-9.
An electrical device comprising the battery according to claim 10.