FPC structure and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses an FPC (Flexible Printed Circuit) structure and a battery pack. The FPC structure comprises a connecting body, a plurality of connecting sheets and a plurality of connecting wires, wherein the connecting body is provided with a plurality of mounting grooves along a first direction; the plurality of connecting sheets are arranged in the plurality of mounting grooves in a one-to-one correspondence manner, and the connecting sheets are used for being connected with busbars; the connecting lines are arranged between the connecting pieces and the mounting grooves in a one-to-one correspondence mode, the two ends of each connecting line are connected to the groove wall of the corresponding mounting groove and the corresponding connecting piece respectively, one part of each connecting line is connected to the side, in the second direction, of the connecting body in a limited mode, and the second direction is perpendicular to the first direction. The other part of the connecting line is connected to the other side, in the second direction, of the connecting body in a limited mode, and the connecting line can be separated from at least one side, in the second direction, of the connecting body when any end is pulled. The FPC structure can absorb the expansive force of the two sides of the battery cell along the thickness of the battery cell, the tearing condition of the FPC is prevented, and the reliability of the FPC structure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field especially relates to a FPC structure and battery pack. BACKGROUND

[0002] FPC (Flexible Printed Circuit, flexible circuit board) belongs to a kind of printed circuit board, it is made of polyimide or polyester film etc. Flexible substrate, with the advantages of high wiring density, light weight, thin, bendable, flexible etc., can withstand millions of times of dynamic bending without damaging wire, can be moved and stretched according to spatial layout requirements, with the incomparable advantage of other types of circuit board, therefore, the application in battery is more widespread.

[0003] When battery pack is assembled, after cell is stacked and electrically connected, the installation of FPC is needed, which is usually provided with a plurality of nickel sheets to be connected one by one with a plurality of busbars, so as to realize the monitoring of voltage and temperature information of each cell. However, long-term use of the cell will produce a certain expansion force, which will cause the cell to expand along the two sides of its own width direction, so space is usually reserved for cell expansion in the battery pack. However, FPC is generally arranged in the thickness direction of the battery, and when the cell expands, FPC will also suffer a certain expansion force on both sides, which may cause FPC to tear, thereby causing safety problems of the battery pack. The prior art usually only considers the absorption of expansion force on one side of FPC, without considering the other side, and the safety problem caused by tearing of FPC is not completely solved.

[0004] Therefore, an FPC structure and battery pack are needed to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] One purpose of the utility model is to provide an FPC structure, which can absorb the expansion force of the cell along the two sides of its own thickness, prevent FPC from tearing, and improve the reliability of the FPC structure.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The FPC structure comprises:

[0008] The connecting body is provided with a plurality of mounting grooves in the first direction;

[0009] A plurality of connecting pieces are provided one by one in a plurality of mounting grooves, and the connecting piece is used to connect with the busbar;

[0010] A plurality of connecting lines are provided between the connecting piece and the mounting slot one by one, both ends of the connecting lines are connected to the slot wall of the mounting slot and the connecting piece respectively, and part of the connecting lines are limitingly connected to one side of the connecting body along a second direction, the second direction is perpendicular to the first direction, another part of the connecting lines are limitingly connected to the other side of the connecting body along the second direction, and the connecting lines can be separated from at least one side of the connecting body along the second direction when any end is subjected to a pulling force.

[0011] Optionally, the connecting lines include two connected annular connecting line groups, at least two annular connecting line groups are limitingly connected to both sides of the connecting body along the second direction, and can be separated from at least one side of the connecting body along the second direction when the connecting lines are subjected to a pulling force.

[0012] Optionally, each annular connecting line group includes at least one connected annular connecting line.

[0013] Optionally, it further includes two limiting assemblies, the two limiting assemblies are provided on both sides of the connecting body along the second direction, and the two annular connecting line groups are clamped in the two limiting assemblies.

[0014] Optionally, the limiting assembly includes a plurality of protrusions, the plurality of protrusions are provided on the connecting body, and a limiting slot is formed between the plurality of protrusions, the annular connecting line group is clamped in the limiting slot, and can be separated from the limiting slot when the connecting lines are subjected to a pulling force.

[0015] Optionally, the limiting assembly includes a limiting rod, one end of the limiting rod is connected to the connecting body, the other end of the limiting rod is away from the connecting body to form a clamping slot away from the connecting piece, the annular connecting line group is clamped in the clamping slot, and can be separated from the clamping slot when the connecting lines are subjected to a pulling force.

[0016] Optionally, the limiting rod in each limiting assembly is spaced apart by at least two along the first direction.

[0017] Optionally, the limiting assembly includes a limiting convex ring, both ends of the limiting convex ring are connected to the connecting body and protrude in the middle to form a limiting passage, the annular connecting line group is clamped in the limiting convex ring, and can be separated from the limiting convex ring when the connecting lines are subjected to a pulling force.

[0018] Optionally, the limiting convex ring in each limiting assembly is spaced apart by at least two along the first direction.

[0019] Another purpose of the utility model lies in providing a battery pack which can absorb the expansion force of the battery cell along the two sides of the thickness of the battery cell, prevent the FPC from being torn, and improve the reliability of the FPC structure.

[0020] To achieve the purpose, the utility model adopts the following technical scheme:

[0021] The battery pack comprises the FPC structure according to any one of the preceding solutions.

[0022] The utility model has the advantages of:

[0023] The utility model provides a FPC structure and battery pack, through the form of connecting piece is connected with the connecting body through the connecting line, make the distance between connecting piece and connecting body can be determined through the length of connecting line, and on this basis, connecting line is divided into two parts and is connected in the two sides of connecting body along the second direction respectively, make when the distance between connecting body and connecting piece is not needed to increase, connecting line is positioned on the connecting body, and when the distance between each connecting piece of FPC structure needs to increase due to the expansion of battery cell, the stretching between connecting body and connecting piece occurs, make the part of connecting line is positioned by at least one side of connecting body is separated, thereby realize the increase of the length of connecting line, adapt the problem of the distance increasing due to the expansion of battery cell, and the two limiting parts are arranged, no matter the connecting piece is subjected to the forward or reverse tension, can have one side is pulled out and separates the connecting body and realizes the increase of the length of connecting line, better prevent the tearing of FPC structure, improve the use safety and service life of the FPC structure. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the isometric view of the FPC structure provided by the utility model embodiment one;

[0025] Figure 2 It is the partial enlarged view of the limiting assembly provided by the utility model embodiment one;

[0026] Figure 3 It is the isometric view of the FPC structure provided by the utility model embodiment two;

[0027] Figure 4 It is the partial enlarged view of the limiting assembly provided by the utility model embodiment two;

[0028] Figure 5 It is the isometric view of the FPC structure provided by the utility model embodiment three;

[0029] Figure 6 It is the partial enlarged view of the limiting assembly provided by the utility model embodiment three.

[0030] In the drawing:

[0031] 10, connecting body; 11, mounting groove;

[0032] 20, connecting piece;

[0033] 30, connecting line; 31, annular connecting line;

[0034] 40, limiting assembly; 401, limiting groove; 402, clamping groove; 403, limiting channel; 41, protrusion; 42, limiting rod; 43, limiting convex ring. DETAILED DESCRIPTION

[0035] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0036] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] In the description of the embodiment, the terms "up", "down", "left", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0039] The following refers to Figures 1 to 6The utility model provides a FPC structure and battery pack.

[0040] Embodiment one

[0041] The embodiment provides a FPC structure for collecting voltage and temperature signals of each cell in a battery pack.

[0042] It should be noted that the first direction in the embodiment is the X direction in the FPC structure, that is, the length direction of the FPC structure. Figure 1 The second direction in the embodiment is the Y direction in the FPC structure, that is, the thickness direction of the FPC structure. Figure 2 The second direction is perpendicular to the first direction.

[0043] Please refer to Figure 1 Specifically, the FPC structure comprises a connecting body 10, a plurality of connecting pieces 20 and a plurality of connecting lines 30, the connecting body 10 is provided with a plurality of mounting grooves 11 along the first direction; the plurality of connecting pieces 20 are arranged one by one in the plurality of mounting grooves 11, the connecting piece 20 is used for being connected with the busbar; the connecting line 30 is arranged one by one between the connecting piece 20 and the mounting groove 11, both ends of the connecting line 30 are connected to the groove wall of the mounting groove 11 and the connecting piece 20 respectively, and part of the connecting line 30 is limitingly connected to one side of the connecting body 10 along the second direction, the second direction is perpendicular to the first direction, the other part of the connecting line 30 is limitingly connected to the other side of the connecting body 10 along the second direction, and the connecting line 30 can be separated from at least one side of the connecting body 10 along the second direction when any end is subjected to a pulling force.

[0044] In the embodiment, the connecting piece 20 is connected with the connecting body 10 through the connecting line 30, so that the distance between the connecting piece 20 and the connecting body 10 can be determined by the length of the connecting line 30. On this basis, the connecting line 30 is divided into two parts and is limitingly connected to both sides of the connecting body 10 along the second direction, so that the connecting line 30 is limitingly connected to the connecting body 10 without increasing the distance between the connecting body 10 and the connecting piece 20; when the distance between the connecting pieces 20 of the FPC structure needs to be increased due to the expansion of the cell, the connecting body 10 and the connecting piece 20 are stretched, so that the part of the connecting line 30 limitingly connected to at least one side of the connecting body 10 is separated, thereby increasing the length of the connecting line 30 to adapt to the problem of the increased distance caused by the expansion of the cell. The two limiting parts are arranged, so that no matter whether the connecting piece 20 is subjected to a forward or reverse pulling force, one side can be pulled out and separated from the connecting body 10 to increase the length of the connecting line 30, thereby better preventing the FPC structure from being torn and improving the use safety and service life of the FPC structure.

[0045] Please continue to refer to Figure 1In the embodiment, the connecting line 30 comprises two connected annular connecting line groups, and at least two annular connecting line groups are respectively connected to two sides of the connecting body 10 along the second direction and can be separated from at least one side of the connecting body 10 along the second direction when the connecting line 30 is subjected to a pulling force. The two annular connecting line groups are arranged because the first end of the connecting line 30 is connected to the connecting body 10 and the second end of the connecting line 30 is connected to the connecting sheet 20. The annular connecting line group connected to the first end of the connecting line 30 can be pulled and separated from the connecting body 10 when the first end is subjected to a pulling force; similarly, the annular connecting line group connected to the second end of the connecting line 30 can be pulled and separated from the connecting body 10 when the second end is subjected to a pulling force, so that when the connecting sheet 20 is subjected to a pulling force along either side of the first direction due to the swelling of the battery cell, one annular connecting line group is separated to increase the length of the connecting line 30.

[0046] Specifically, each annular connecting line group comprises at least one connected annular connecting line 31, that is, the annular connecting line group can increase the length of the connecting line 30 after being separated from the connecting body 10.

[0047] Optionally, when each annular connecting line group comprises a plurality of annular connecting lines 31, the annular connecting lines 31 can be sequentially separated from the connecting body 10 according to the requirement of the stretching length, so that the connecting body 10 and the connecting sheet 20 still have a certain limitation.

[0048] Exemplarily, the annular connecting line group in the embodiment comprises one annular connecting line 31, so that the connecting line 30 forms a meandering structure.

[0049] Please refer to Figure 1 and Figure 2 In order to realize the limiting effect of the connecting body 10 on the connecting line 30, in the embodiment, the FPC structure further comprises two limiting components 40, and the two limiting components 40 are arranged on both sides of the connecting body 10 along the second direction, and the two annular connecting line groups are respectively clamped to the two limiting components 40, so that the limiting effect of the annular connecting line group can be realized by the limiting component 40.

[0050] Specifically, the limiting component 40 comprises a plurality of protrusions 41, and the plurality of protrusions 41 are arranged on the connecting body 10, and the plurality of protrusions 41 surround to form a limiting groove 401, and the annular connecting line group is clamped in the limiting groove 401 and can be separated from the limiting groove 401 when the connecting line 30 is subjected to a pulling force.

[0051] Specifically, the plurality of protrusions 41 are distributed at intervals to form the limiting groove 401 for limiting the annular connecting line group. Exemplarily, three protrusions 41 are arranged on each side of the connecting body 10 along the second direction, two of the three protrusions 41 are arranged at the top, and one is arranged at the bottom between the two protrusions 41 at the top, so that the limiting groove 401 is formed between the protrusions 41 at the top and the protrusion 41 at the bottom.

[0052] In the embodiment, the FPC structure further comprises a connector arranged on the connecting body 10, and the connector is used to be electrically connected with an external BMS (Battery Management System) to realize the transmission of the collected signals.

[0053] The embodiment further provides a battery pack comprising the FPC structure according to any one of the above-mentioned solutions. By using the FPC structure, when the battery cells in the battery pack expand, the FPC can adapt to the expansion, further prevent the tearing from occurring, and improve the service life of the battery pack.

[0054] Specifically, the battery pack comprises a plurality of battery cells arranged in groups and electrically connected through bus bars, and the FPC structure is arranged on the battery cells arranged in groups, and each connecting piece 20 in the FPC structure is electrically connected with each bus bar one by one, so as to realize the collection of the voltage and temperature signals of the battery cells by the FPC structure.

[0055] It should be noted that the battery pack can be a device loaded with a plurality of battery cells, such as a battery module, a battery pack, etc., which is not specifically limited here.

[0056] Embodiment Two

[0057] The embodiment provides an FPC structure and a battery pack, which are used to collect the voltage and temperature signals of each battery cell in the battery pack. The difference between the embodiment and the first embodiment is that the limiting assembly 40 is different.

[0058] It should be noted that the first direction in the embodiment is the X direction in the Figure 3 , which is also the length direction of the FPC structure, and the second direction in the embodiment is the Y direction in the Figure 4 , which is also the thickness direction of the FPC structure, and the second direction is perpendicular to the first direction.

[0059] Please refer to Figure 3 and Figure 4 . Specifically, the limiting assembly 40 in the embodiment comprises a limiting rod 42, one end of the limiting rod 42 is connected to the connecting body 10, the other end of the limiting rod 42 is away from the connecting body 10 to form a clamping groove 402 away from the connecting piece 20, and the annular connecting wire set is clamped in the clamping groove 402 and can be separated from the clamping groove 402 when the connecting wire 30 is subjected to a pulling force. In this way, the annular connecting wire set can be limited to be arranged in the clamping groove 402, and when the connecting wire 30 is subjected to a pulling force, the corresponding annular connecting wire set will bend or break the limiting rod 42 to separate from the clamping groove 402, so as to realize the growth of the connecting wire 30.

[0060] Optionally, the limiting rods 42 in each limiting assembly 40 are spaced apart in the first direction by at least two, so as to increase the limiting capacity of the limiting assembly 40 on the annular connecting wire group.

[0061] Embodiment three

[0062] The embodiment provides an FPC structure and a battery pack, which are used for collecting signals such as voltages and temperatures of each battery cell in the battery pack. The embodiment is different from the embodiment one or the embodiment two in that the limiting assembly 40 is different.

[0063] It should be noted that the first direction in the embodiment is the X direction in the FPC structure, which is also the length direction of the FPC structure. Figure 5 The second direction in the embodiment is the Y direction in the FPC structure, which is also the thickness direction of the FPC structure, and the second direction is perpendicular to the first direction. Figure 6

[0064] Please refer to Figure 5 and Figure 6 Specifically, the limiting assembly 40 in the embodiment includes a limiting convex ring 43, two ends of the limiting convex ring 43 are connected to the connecting body 10 and the middle convex 41, so as to form a limiting channel 403, the annular connecting wire group is clamped in the limiting convex ring 43 and can be separated from the limiting convex ring 43 when the connecting wire 30 is subjected to a pulling force. That is, the annular connecting wire group is limited and connected to the connecting body 10 through the limiting convex ring 43, and when the connecting wire 30 is subjected to a pulling force, a certain force is given to the limiting convex ring 43, so that the limiting convex ring 43 is broken, so as to realize the separation of the annular connecting wire group.

[0065] Optionally, the limiting convex ring 43 in each limiting assembly 40 is spaced apart in the first direction by at least two, so as to increase the limiting capacity of the limiting assembly 40 on the annular connecting wire group.

[0066] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.​

Claims

1. An FPC structure, characterized by, The utility model relates to a FPC structure, comprising: a connecting body provided with a plurality of mounting slots along a first direction; a plurality of connecting pieces one-to-one corresponding arranged in the mounting slots, the connecting pieces are used for connecting with busbars; a plurality of connecting lines one-to-one corresponding arranged between the connecting pieces and the mounting slots, both ends of the connecting lines are connected to the slot wall of the mounting slot and the connecting piece respectively, and part of the connecting lines is limitedly connected to one side of the connecting body along a second direction, the second direction is perpendicular to the first direction, another part of the connecting lines is limitedly connected to the other side of the connecting body along the second direction, and the connecting lines can be separated from at least one side of the connecting body along the second direction when any end is subjected to a pulling force.

2. The FPC structure of claim 1, wherein, The connecting lines comprise two connected annular connecting line groups, and at least two annular connecting line groups are limitedly connected to both sides of the connecting body along the second direction and can be separated from at least one side of the connecting body along the second direction when the connecting lines are subjected to a pulling force.

3. The FPC structure of claim 2, wherein, Each annular connecting line group comprises at least one connected annular connecting line.

4. The FPC structure of claim 2, wherein, Two limiting assemblies are further included, and the two limiting assemblies are arranged on both sides of the connecting body along the second direction, and the two annular connecting line groups are clamped in the two limiting assemblies.

5. The FPC structure of claim 4, wherein, The limiting assembly comprises a plurality of protrusions arranged on the connecting body, and a limiting slot is formed between the plurality of protrusions, the annular connecting line group is clamped in the limiting slot, and can be separated from the limiting slot when the connecting line is subjected to a pulling force.

6. The FPC structure of claim 4, wherein, The limiting assembly comprises a limiting rod, one end of the limiting rod is connected to the connecting body, the other end of the limiting rod is away from the connecting body to form a clamping slot away from the connecting piece, the annular connecting line group is clamped in the clamping slot, and can be separated from the clamping slot when the connecting line is subjected to a pulling force.

7. The FPC structure of claim 6, wherein, The limiting rod in each limiting assembly is spaced apart along the first direction by at least two.

8. The FPC structure of claim 4, wherein, The limiting assembly comprises a limiting convex ring, both ends of the limiting convex ring are connected to the connecting body and protrude in the middle to form a limiting channel, the annular connecting line group is clamped in the limiting convex ring, and can be separated from the limiting convex ring when the connecting line is subjected to a pulling force.

9. The FPC structure of claim 8, wherein, The limiting convex ring in each limiting assembly is spaced apart along the first direction by at least two.

10. A battery pack characterized by The utility model relates to a FPC structure, comprising: a connecting body provided with a plurality of mounting slots along a first direction; a plurality of connecting pieces one-to-one corresponding arranged in the mounting slots, the connecting pieces are used for connecting with busbars; a plurality of connecting lines one-to-one corresponding arranged between the connecting pieces and the mounting slots, both ends of the connecting lines are connected to the slot wall of the mounting slot and the connecting piece respectively, and part of the connecting lines is limitedly connected to one side of the connecting body along a second direction, the second direction is perpendicular to the first direction, another part of the connecting lines is limitedly connected to the other side of the connecting body along the second direction, and the connecting lines can be separated from at least one side of the connecting body along the second direction when any end is subjected to a pulling force. The connecting lines comprise two connected annular connecting line groups, and at least two annular connecting line groups are limitedly connected to both sides of the connecting body along the second direction and can be separated from at least one side of the connecting body along the second direction when the connecting lines are subjected to a pulling force. Each annular connecting line group comprises at least one connected annular connecting line. Two limiting assemblies are further included, and the two limiting assemblies are arranged on both sides of the connecting body along the second direction, and the two annular connecting line groups are clamped in the two limiting assemblies. The limiting assembly comprises a plurality of protrusions arranged on the connecting body, and a limiting slot is formed between the plurality of protrusions, the annular connecting line group is clamped in the limiting slot, and can be separated from the limiting slot when the connecting line is subjected to a pulling force. The limiting assembly comprises a limiting rod, one end of the limiting rod is connected to the connecting body, the other end of the limiting rod is away from the connecting body to form a clamping slot away from the connecting piece, the annular connecting line group is clamped in the clamping slot, and can be separated from the clamping slot when the connecting line is subjected to a pulling force. The limiting rod in each limiting assembly is spaced apart along the first direction by at least two. The limiting assembly comprises a limiting convex ring, both ends of the limiting convex ring are connected to the connecting body and protrude in the middle to form a limiting channel, the annular connecting line group is clamped in the limiting convex ring, and can be separated from the limiting convex ring when the connecting line is subjected to a pulling force. The limiting convex ring in each limiting assembly is spaced apart along the first direction by at least two.

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