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 an FPC board, a plurality of sampling pieces and a plurality of connecting lines, wherein the FPC board is provided with a plurality of connecting grooves along a first direction; the plurality of sampling pieces are arranged in the plurality of connecting grooves in a one-to-one correspondence manner, and the sampling pieces are used for being connected with busbars; the connecting lines are arranged between the sampling piece and the connecting groove in a one-to-one correspondence mode, the two ends of each connecting line are connected to the groove wall of the connecting groove and the sampling piece respectively, each connecting line comprises a telescopic section, at least part of each telescopic section is connected to the groove wall of the connecting groove, and each connecting line can stretch 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 the technical field of batteries, in particular to an FPC structure and a battery pack. Background Art

[0002] FPC (Flexible Printed Circuit) is a type of printed circuit board. It is made of flexible substrates such as polyimide or polyester film. It has the advantages of high wiring density, light weight, thin thickness, bendability, and high flexibility. It can withstand millions of dynamic bending without damaging the wires and can move and stretch arbitrarily according to spatial layout requirements. It has advantages that other types of circuit boards cannot match. Therefore, it is widely used in batteries.

[0003] During battery pack assembly, after the cells are stacked into groups and electrically connected, the FPC needs to be installed. It is usually equipped with multiple nickel sheets that are connected one-to-one with multiple busbars to monitor the voltage, temperature and other information of each cell. However, the long-term use of the cell will generate a certain amount of expansion force, which will cause the cell to expand on both sides along its own width. Therefore, space is often reserved in the battery pack for the cell expansion. However, the FPC is generally extended along the thickness direction of the battery. When the cell expands, the FPC will also be subjected to a certain amount of expansion force on both sides, which may cause the FPC to tear, thereby causing safety problems in the battery pack. The existing technology often only considers the absorption of the expansion force on one side of the FPC, but not on the other side, and does not completely solve the safety problems caused by the tearing of the FPC.

[0004] Therefore, there is an urgent need for an FPC structure and a battery pack to solve the above technical problems. Utility Model Content

[0005] One purpose of the present utility model is to provide an FPC structure that can absorb the expansion force of the battery core on both sides along its own thickness, prevent the FPC from tearing, and improve the reliability of the FPC structure.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] FPC structure, including:

[0008] An FPC board, wherein the FPC board is provided with a plurality of connection grooves along a first direction;

[0009] A plurality of sampling pieces, each of which is disposed in a one-to-one correspondence in the plurality of connection slots, and the sampling pieces are used to connect to the busbar;

[0010] Multiple connecting lines are arranged one by one between the sampling member and the connecting groove, and the two ends of the connecting line are respectively connected to the groove wall of the connecting groove and the sampling member. The connecting line includes a retractable telescopic section, and at least a portion of the telescopic section is connected to the groove wall of the connecting groove. When either end of the connecting line is subjected to tension, the connection between at least a portion of the telescopic section and the groove wall of the connecting groove can be disconnected to increase the length of the connecting line.

[0011] Optionally, the telescopic section includes an overlapping section so that the telescopic section can be telescopic, and the overlapping section can be connected to the groove wall of the connecting groove.

[0012] Optionally, the overlapping section is in a U-shape or a V-shape.

[0013] Optionally, at least two overlapping sections are provided along the telescopic direction of the telescopic section.

[0014] Optionally, one end of the connecting line is connected to the bottom wall or side wall of the connecting groove, and the other end is connected to the sampling member; at least a portion of the telescopic section is connected to the bottom wall or side wall of the connecting groove.

[0015] Optionally, the connecting line further includes two straight segments, the two straight segments are respectively connected to two ends of the telescopic segment, and the straight segments are connected to the groove wall of the connecting groove or the sampling member.

[0016] Optionally, the FPC structure further includes a plug-in connector, which is disposed on one side of the FPC board and is used for electrically connecting to an external BMS.

[0017] Optionally, a connecting end is provided on any side of the telescopic section, and the connecting end is connected to the groove wall of the connecting groove.

[0018] Optionally, connecting ends are provided on opposite sides of the telescopic section, and the connecting ends on both sides of the telescopic section are respectively connected to two opposite groove walls of the connecting groove.

[0019] Another object of the present invention is to provide a battery pack that can absorb the expansion force of the battery cell on both sides along its own thickness, prevent the FPC from tearing, and improve the reliability of the FPC structure.

[0020] To achieve this purpose, the present invention adopts the following technical solutions:

[0021] A battery pack comprising the FPC structure described above in any of the above schemes.

[0022] Beneficial effects of the utility model:

[0023] The present invention provides an FPC structure and a battery pack. By providing a connecting wire with a telescopic section between the FPC board and the connecting wire, when the distance between the various sampling pieces of the FPC structure needs to be increased due to the expansion of the battery cell, the telescopic section of the connecting wire is extended, thereby increasing the length of the connecting wire to accommodate the problem of increased distance caused by the expansion of the battery cell. Regardless of whether the sampling piece is subjected to positive or negative tension, it can be extended and the length of the connecting wire can be increased, thereby better preventing the FPC structure from tearing and improving the safety and service life of the FPC structure. In addition, at least a portion of the telescopic section is connected to the wall of the connecting groove, so that the connecting wire has other locations for connection with the FPC board in addition to the two ends, and the telescopic section will not be extended when it is not necessary to extend, thereby improving the connection stability between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of the FPC structure provided by the first optional embodiment of the utility model;

[0025] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0026] Figure 3 2 is a front view of an FPC structure provided by a second optional embodiment of the present invention;

[0027] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0028] Figure 5 1 is a front view of an FPC structure provided by a third optional embodiment of the present utility model;

[0029] Figure 6 yes Figure 5 A partial enlarged view of point C in the middle.

[0030] In the picture:

[0031] 10. FPC board; 11. Connection slot;

[0032] 20. Sampling pieces;

[0033] 30. Connecting line; 31. Telescopic section; 311. Overlapping section; 312. Connecting end; 32. Straight line section. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0035] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] Refer to the following Figures 1 to 6 The present invention introduces an FPC structure and a battery pack.

[0039] This embodiment provides an FPC structure, which is used to collect signals such as voltage and temperature of each battery cell in a battery pack.

[0040] Please refer to Figures 1 to 6Specifically, the FPC structure includes an FPC board 10, multiple sampling parts 20 and multiple connecting wires 30. The FPC board 10 is provided with multiple connecting grooves 11 along a first direction; the multiple sampling parts 20 are arranged in a one-to-one correspondence in the multiple connecting grooves 11, and the sampling parts 20 are used to connect to the bus; the connecting wires 30 are arranged in a one-to-one correspondence between the sampling parts 20 and the connecting grooves 11, and the two ends of the connecting wires 30 are respectively connected to the groove wall of the connecting groove 11 and the sampling parts 20. The connecting wires 30 include a retractable telescopic section 31, and at least a portion of the telescopic section 31 is connected to the groove wall of the connecting groove 11. When either end of the connecting wire 30 is subjected to tension, the connection between at least a portion of the telescopic section 31 and the groove wall of the connecting groove 11 can be disconnected to increase the length of the connecting wire 30.

[0041] The FPC structure of this embodiment provides a connecting wire 30 having a telescopic section 31 between the FPC board 10 and the connecting wire 30. This allows the telescopic section 31 of the connecting wire 30 to extend when the distance between the various sampling pieces 20 of the FPC structure needs to increase due to cell expansion. This increases the length of the connecting wire 30 to accommodate the increased distance caused by cell expansion. Regardless of whether the sampling piece 20 is subjected to positive or negative tension, the connecting wire 30 can be extended and its length increased, thereby better preventing the FPC structure from tearing and improving its safety and service life. Furthermore, at least a portion of the telescopic section 31 is connected to the wall of the connecting slot 11, allowing the connecting wire 30 to connect to the FPC board 10 at other locations besides its two ends. Furthermore, the telescopic section 31 does not extend or retract when it is not necessary to extend, thereby improving the stability of the connection between the two.

[0042] In this embodiment, the telescopic section 31 includes an overlapping section 311, so that the telescopic section 31 is telescopic and can be connected to the groove wall of the above-mentioned connecting groove 11 to achieve a connection between at least a portion of the telescopic section 31 and the groove wall of the connecting groove 11; and the overlapping section 311 has a certain elasticity, that is, when the connecting line 30 is in a normal state, the overlapping section 311 is in an overlapping state; when growth is required, the overlapping section 311 is unfolded, thereby achieving the telescopic effect of the telescopic section 31.

[0043] Optionally, the overlapping section 311 is in a U-shape or a V-shape, so that the telescopic effect of the overlapping section 311 can be achieved.

[0044] Optionally, at least two overlapping sections 311 are provided along the expansion and contraction direction of the expansion section 31 to increase the expansion and contraction amount of the expansion section 31 , thereby meeting the adaptability of the FPC after the battery cell undergoes a large expansion.

[0045] In some embodiments, a connection end 312 is provided on either side of the telescopic section 31. The connection end 312 is connected to the wall of the connection groove 11 to achieve a connection between the telescopic section 31 and the wall of the connection groove 11, thereby increasing the connection strength between the two and improving the connection stability of the sampling piece 20. Specifically, when the telescopic section 31 needs to be expanded, the connection end 312 between the telescopic section 31 and the wall of the connection groove 11 can be gradually disconnected. Therefore, when the battery cell does not expand much, even if the telescopic section 31 is partially expanded, a portion of the connection end 312 of the telescopic section 31 is still connected to the wall of the connection groove 11, thereby improving the connection stability between the sampling piece 20 and the FPC board 10.

[0046] Preferably, connecting ends 312 are provided on opposite sides of the telescopic section 31, and the connecting ends 312 on both sides of the overlapping section 311 are respectively connected to two opposite groove walls of the connecting groove 11. This arrangement can further improve the connection stability between the sampling piece 20 and the FPC board 10.

[0047] Furthermore, the connecting line 30 also includes two straight segments 32, which are respectively connected to the two ends of the telescopic section 31, and the straight segments 32 are connected to the groove wall of the connecting groove 11 or the sampling piece 20, so that the two ends of the connecting line 30 are arranged one-to-one between the above-mentioned sampling piece 20 and the above-mentioned connecting groove 11.

[0048] Specifically, one end of the connecting line 30 is connected to the bottom wall or side wall of the connecting groove 11, and the other end is connected to the sampling member 20; at least a portion of the telescopic section 31 is connected to the bottom wall or side wall of the connecting groove 11. This arrangement allows the connecting line 30 to be connected to the bottom wall and / or side wall of the connecting groove 11, which can achieve the functions of connection, telescoping, and improving connection stability of the connecting line 30.

[0049] Please refer to Figure 1 and Figure 2 In a first optional embodiment, one end of the connecting line 30 is connected to the bottom wall of the connecting groove 11, and the connecting end 312 of the telescopic section 31 is also connected to the bottom wall of the connecting groove 11, that is, the connecting line 30 is located between the bottom wall of the connecting groove 11 and the sampling member 20, thereby realizing the connection, telescoping and improving the stability of the connection between the two.

[0050] Please refer to Figure 3 and Figure 4 In a second optional embodiment, one end of the connecting line 30 is connected to any side wall of the connecting groove 11, and the connecting end 312 of the telescopic section 31 is also connected to any side wall of the connecting groove 11, that is, the connecting line 30 is between any side wall of the connecting groove 11 and the sampling member 20, which can realize the connection, telescoping and improvement of the connection stability of the connecting line 30.

[0051] Please refer to Figure 5 and Figure 6 In a third optional embodiment, one end of the connecting line 30 is connected to the bottom wall of the connecting groove 11, and the connecting end 312 of the telescopic section 31 is connected to at least one side wall of the connecting groove 11. That is, the connecting line 30 is between the bottom wall of the connecting groove 11 and the sampling member 20, but the telescopic section 31 is connected to at least one side wall of the connecting groove 11, further realizing the connection and telescopic functions of the connecting line 30 and further improving the connection stability between the two.

[0052] In this embodiment, the FPC structure further includes a plug-in connector, which is provided on one side of the FPC board 10 and is used to electrically connect to an external BMS (Battery Management System) to achieve transmission of collected signals.

[0053] This embodiment also provides a battery pack including the FPC structure described in any of the above solutions. By adopting this FPC structure, when the battery cells in the battery pack expand, the FPC structure can adapt to the expansion, further preventing tearing and extending the service life of the battery pack.

[0054] Specifically, the battery pack includes a plurality of battery cells arranged in groups and electrically connected through a bus. The FPC structure is arranged on the grouped battery cells, and each sampling piece 20 in the FPC structure is electrically connected to each bus one by one, thereby enabling the FPC structure to collect the voltage and temperature signals of the battery cells.

[0055] It should be noted that the battery pack may be a battery module, a battery pack, or other device loaded with multiple battery cells, which is not specifically limited here.

[0056] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. FPC structure, characterized in that, include: An FPC board, wherein the FPC board is provided with a plurality of connection grooves along a first direction; A plurality of sampling pieces, each of which is disposed in a one-to-one correspondence in the plurality of connecting grooves, and the sampling pieces are used to connect to the busbar; A plurality of connecting lines are provided one by one between the sampling member and the connecting groove, and the two ends of the connecting line are respectively connected to the groove wall of the connecting groove and the sampling member, and the connecting line includes a retractable telescopic section, at least a portion of the telescopic section is connected to the groove wall of the connecting groove, and when either end of the connecting line is subjected to tension, the connection between at least a portion of the telescopic section and the groove wall of the connecting groove can be disconnected to increase the length of the connecting line.

2. The FPC structure according to claim 1, characterized in that The telescopic section includes an overlapping section so that the telescopic section can be telescoped, and the overlapping section can be connected to the groove wall of the connecting groove.

3. The FPC structure according to claim 2, characterized in that: The overlapping section is in a U-shape or a V-shape.

4. The FPC structure according to claim 2, characterized in that: At least two overlapping sections are provided along the telescopic direction of the telescopic section.

5. The FPC structure according to claim 1, wherein: One end of the connecting line is connected to the bottom wall or side wall of the connecting groove, and the other end is connected to the sampling member; at least a portion of the telescopic section is connected to the bottom wall or side wall of the connecting groove.

6. The FPC structure according to claim 1, wherein: The connecting line further comprises two straight segments, the two straight segments are respectively connected to the two ends of the telescopic segment, and the straight segments are connected to the groove wall of the connecting groove or the sampling member.

7. The FPC structure according to claim 1, wherein: The FPC structure further includes a plug-in connector, which is arranged on one side of the FPC board and is used for electrically connecting to an external BMS.

8. The FPC structure according to any one of claims 1 to 7, characterized in that: A connecting end is provided on either side of the telescopic section, and the connecting end is connected to the groove wall of the connecting groove.

9. The FPC structure according to any one of claims 1 to 7, characterized in that: The two opposite sides of the telescopic section are both provided with connecting ends, and the connecting ends on both sides of the telescopic section are respectively connected to two opposite groove walls of the connecting groove.

10. A battery pack, characterized in that The invention comprises the FPC structure as claimed in any one of claims 1 to 9.

Images