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 body part, a plurality of connecting parts and a plurality of expansion absorbing parts, and the body part is sequentially provided with a plurality of connecting grooves in the first direction; one ends of the plurality of connecting pieces are elastically connected with the plurality of connecting grooves in a one-to-one correspondence manner, and the other ends of the plurality of connecting pieces extend out of the connecting pieces so as to be connected with the busbar; a gap is formed between any end, in the first direction, of the connecting piece and the groove wall of the connecting groove. The plurality of expansion absorption parts are respectively arranged in the plurality of gaps, two ends of each expansion absorption part are respectively connected with the corresponding joining parts and any groove wall of the connecting groove, and the expansion absorption parts are used for being disconnected when the battery core expands along the first direction so as to increase the distance between the two adjacent joining parts. 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 battery technical field especially relates to a FPC structure and battery pack. BACKGROUND

[0002] FPC (Flexible Printed Circuit, flexible circuit board) belongs to printed circuit board, and it is made of flexible base material such as polyimide or polyester film, has the advantages of high wiring density, light weight, thin thickness, bendable, high flexibility, can withstand millions of times of dynamic bending without damaging the wire, can be moved and stretched according to the space layout requirements, has incomparable advantages compared with other types of circuit boards, therefore, the application in battery is more extensive.

[0003] When assembling the battery pack, the battery cell is stacked into groups and electrically connected, and the installation of FPC is required, which is usually provided with a plurality of nickel sheets to be connected one by one with a plurality of busbars to realize the monitoring of the voltage and temperature information of each battery cell. However, long-term use of the battery cell will produce a certain expansion force, which will cause the battery cell to expand along the two sides of its own width direction, so space is usually reserved for the expansion of the battery cell in the battery pack. However, the FPC is generally arranged in the thickness direction of the battery, and when the battery cell expands, the FPC will also be subjected to a certain expansion force on both sides, which may cause the FPC to tear, thereby causing safety problems of the battery pack. The prior art usually only considers the absorption of the expansion force on one side of the FPC, and does not consider the other side, and does not completely solve the safety problem caused by the tearing of the FPC.

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

[0005] One purpose of the utility model is to provide an FPC structure which can absorb the expansion force of the battery cell along the two sides of its own thickness, prevent the 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 body piece is provided with a plurality of connecting grooves in sequence in the first direction;

[0009] A plurality of connecting pieces are provided, one end of each of the plurality of connecting pieces is elastically connected to one of the plurality of connecting grooves, and the other end of each of the plurality of connecting pieces extends out of the connecting piece to be connected to the busbar; and a gap is provided between any end of the connecting piece in the first direction and the groove wall of the connecting groove.

[0010] A plurality of expansion absorbing members are arranged in the plurality of gaps respectively, and two ends of each of the expansion absorbing members are connected with the corresponding connecting slot wall and the corresponding connecting member respectively, and the expansion absorbing members are used to break when the battery cell expands along the first direction, so as to increase the spacing between the two adjacent connecting members.

[0011] Optionally, each of the gaps is provided with one of the expansion absorbing members, and two ends of the expansion absorbing member are connected with the connecting slot wall and the connecting member respectively.

[0012] Optionally, the length of the expansion absorbing member is not less than the size of the gap along the first direction.

[0013] Optionally, the expansion absorbing member is provided with a plurality of connecting ends on both sides along the first direction, and the connecting ends are connected with the connecting slot wall or the connecting member.

[0014] Optionally, each of the gaps is provided with at least two expansion absorbing members, and the lengths of the expansion absorbing members in each of the gaps are different.

[0015] Optionally, the length of the expansion absorbing member with the smallest length is not less than the size of the gap along the first direction.

[0016] Optionally, the connecting member comprises an extension, one end of the extension is connected with the connecting slot, the other end of the extension is connectable with the bus bar, the extension is provided with the expansion absorbing member on both sides along the first direction, and the extension is telescopic.

[0017] Optionally, the extension is in the shape of U, S or V, so that the extension is telescopic.

[0018] Optionally, the connecting member further comprises a connecting sheet, the connecting sheet is connected with the other end of the extension, and the connecting sheet is used to connect with the bus bar.

[0019] Another purpose of the utility model is to provide 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 in any of the above-mentioned schemes.

[0022] The utility model has the advantages of:

[0023] The present invention provides an FPC structure and battery pack. By providing expansion absorbers at the gaps between the two ends of each connector and the wall of the connecting groove, when the battery cell expands, the expansion absorber is stretched and disconnected along the first direction as the expansion force increases, thereby increasing the distance between the connector and the connecting groove along the first direction, thereby increasing the distance between adjacent connectors to accommodate the problem of increased distance caused by the expansion of the battery cell. In addition, expansion absorbers are provided at both ends of each connector, so that whether the FPC structure expands and stretches in the positive or negative direction along the first direction, the corresponding expansion absorber can disconnect to absorb the increased distance caused by the corresponding expansion, better preventing the FPC structure from tearing and improving the safety and service life of the FPC structure. At the same time, after any expansion absorber at the two ends of each connector expands and stretches until it breaks, another expansion absorber is provided between the connector and the main body to prevent the connector from completely disconnecting and causing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the FPC structure provided by the specific embodiment of the utility model;

[0025] Figure 2 yes Figure 1 A is a partial enlarged view of the expansion absorber of the first optional embodiment;

[0026] Figure 3 yes Figure 1 A partial enlarged view of the expansion absorber of the second optional embodiment at A;

[0027] Figure 4 yes Figure 1 A is a partial enlarged view of the expansion absorber of the third optional embodiment.

[0028] In the picture:

[0029] 10. Main body; 11. Connecting groove;

[0030] 20. Connecting piece; 21. Extension; 22. Connecting piece;

[0031] 30. Expansion absorber; 31. Connecting end;

[0032] 40. Gap. DETAILED DESCRIPTION

[0033] The utility model will be described in further detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model, and not to limit 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, rather than all the structures.

[0034] 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.

[0035] 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.

[0036] 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 cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

[0037] The following refers to Figures 1 to 4 The utility model provides a FPC structure and a battery pack.

[0038] It should be noted that the first direction in the embodiment is Figure 1 X direction in the FPC structure, and the length direction of the FPC structure.

[0039] The embodiment provides a FPC structure for collecting voltage and temperature signals of each battery cell in a battery pack.

[0040] Please refer to Figure 1 And Figure 2, Specifically, the FPC structure comprises a body piece 10, a plurality of connecting pieces 20 and a plurality of expansion absorbing pieces 30, the body piece 10 is provided with a plurality of connecting grooves 11 in sequence along a first direction; one end of each of the plurality of connecting pieces 20 is elastically connected to one of the plurality of connecting grooves 11, and the other end of each of the plurality of connecting pieces 20 extends out of the connecting piece 20 for connection with a busbar; a gap 40 is arranged between any end of the connecting piece 20 along the first direction and a groove wall of the connecting groove 11; each of the plurality of expansion absorbing pieces 30 is arranged in one of the plurality of gaps 40, and both ends of each of the expansion absorbing pieces 30 are connected to the corresponding connecting piece 20 and any groove wall of the connecting groove 11 respectively, and the expansion absorbing piece 30 is used to break when the battery cell expands along the first direction, so as to increase the distance between the two adjacent connecting pieces 20.

[0041] In the FPC structure of the embodiment, the expansion absorbing piece 30 is arranged at the gap 40 between the two ends of each of the connecting pieces 20 and the groove wall of the connecting groove 11, so that when the battery cell expands, the expansion absorbing piece 30 is stretched along the first direction and broken with the increase of the expansion force, that is, the distance between the connecting piece 20 and the connecting groove 11 along the first direction is increased, so that the distance between the adjacent connecting pieces 20 is increased, to solve the problem of the increased distance caused by the expansion of the battery cell. In addition, the two ends of each of the connecting pieces 20 are provided with the expansion absorbing piece 30, so that no matter the FPC structure is stretched in the positive direction or in the reverse direction along the first direction, the corresponding expansion absorbing piece 30 can break to absorb the distance caused by the corresponding expansion, so as to better prevent the FPC structure from being torn, and improve the use safety and service life of the FPC structure. Meanwhile, after any of the expansion absorbing pieces 30 at the two ends of the connecting piece 20 is stretched and broken, another expansion absorbing piece 30 is arranged between the connecting piece 20 and the body piece 10, to avoid the problem of damage caused by the complete breakage of the connecting piece 20.

[0042] In the embodiment, the number of the expansion absorbing pieces 30 arranged at each of the gaps 40 can be determined according to actual needs, which is not limited herein.

[0043] Please refer to Figure 2 In an optional embodiment, one expansion absorbing piece 30 is arranged at each of the gaps 40, and both ends of the expansion absorbing piece 30 are connected to the groove wall of the connecting groove 11 and the connecting piece 20 respectively, so as to realize the function of the expansion absorbing piece 30.

[0044] Optionally, the length of the expansion absorbing piece 30 is not less than the size of the gap 40 along the first direction, that is, the connection between the expansion absorbing piece 30, the connecting piece 20 and the groove wall of the connecting groove 11 is realized. When the length of the expansion absorbing piece 30 is greater than the size of the gap 40 along the first direction, there is a certain amount of space between the connecting piece 20 and the groove wall of the connecting groove 11 in the first direction, which can absorb the expansion of the battery cell.

[0045] Optionally, the expansion absorbing piece 30 is provided with a plurality of connecting ends 31 on both sides along the first direction, and the connecting ends 31 are connected with the slot wall of the connecting slot 11 or the connecting piece 20, so as to realize the connecting effect between the connecting ends 31 of the expansion absorbing piece 30 and the slot wall of the connecting slot 11.

[0046] Please refer to Figure 3 Further optionally, the expansion absorbing piece 30 is provided with at least two connecting ends 31 on both sides along the first direction, so that the connecting part between the expansion absorbing piece 30 and the slot wall of the connecting slot 11 can be provided with a plurality of connecting ends 31, which not only increases the connection between the two, but also reduces the connecting strength of a single connecting end 31 through the provision of a plurality of connecting ends 31, so that the expansion absorbing piece 30 is easier to break when it breaks.

[0047] Please refer to Figure 4 In another optional embodiment, at least two expansion absorbing pieces 30 are provided at each gap 40, and the lengths of the expansion absorbing pieces 30 at each gap 40 are different. This arrangement allows the expansion absorbing pieces 30 to break in sequence according to the increasing distance of the expansion of the battery cell, and after the first break, other expansion absorbing pieces 30 are connected to the connecting piece 20 and the body piece 10, thereby improving the connecting strength between the connecting piece 20 and the body piece 10.

[0048] Optionally, the length of the expansion absorbing piece 30 with the smallest length is not less than the size of the gap 40 along the first direction, so as to ensure that the expansion absorbing pieces 30 are not in a stretched state when the battery cell is not expanded.

[0049] Please refer to Figures 1 to 4 In this embodiment, the connecting piece 20 includes an extension part 21, one end of the extension part 21 is connected to the connecting slot 11, the other end of the extension part 21 can be connected to the busbar, and the extension part 21 is provided with expansion absorbing pieces 30 on both sides along the first direction, and the extension part 21 is stretchable. This arrangement allows the connecting piece 20 to stretch or elongate in other directions after the expansion absorbing piece 30 breaks, and the extension part 21 can compensate for the displacement amount of the stretching or elongation of the connecting piece 20.

[0050] Optionally, the extension part 21 is in the shape of U, S or V, so that the extension part 21 is stretchable. That is, the extension part 21 is in a winding shape in the normal state, so that when the connecting piece 20 needs to stretch or elongate in a direction other than the first direction, the extension part 21 can gradually unfold and elongate to provide a stretchable amount, further preventing the possibility of tearing of the connecting piece 20.

[0051] Further, the connecting piece 20 further includes a connecting sheet 22 connected to the other end of the extension part 21, and the connecting sheet 22 is used to connect with the busbar to realize the collection of information of the battery cell.

[0052] Optionally, the connecting piece 22 is a nickel piece, which has the advantages of good welding effect, low internal resistance, good conductivity, low cost, etc.

[0053] The specific structure of the adapter 20 shows that one end of the adapter 20 is one end of the extension part 21, which is directly connected with the connecting groove 11. The other end of the adapter 20 is a connecting piece, which is connected to the other end of the extension part 21 and can extend out of the extension part 21 for connection with the busbar.

[0054] Optionally, the FPC structure further comprises a connector, which is arranged on the body piece 10 and is used for electrical connection with an external BMS (Battery Management System) to realize transmission of collected signals.

[0055] The embodiment also provides a battery pack comprising the FPC structure according to any one of the above schemes. By adopting the FPC structure, when the battery cells in the battery pack expand, the FPC can adapt to the expansion, further prevent tearing from occurring, and improve the service life of the battery pack.

[0056] Specifically, the battery pack comprises a plurality of battery cells arranged in groups and electrically connected through busbars, the FPC structure is arranged on the battery cells arranged in groups, and the other end of the adapter 20 in the FPC structure is electrically connected with each busbar one by one in a one-to-one correspondence, so as to realize collection of voltage and temperature signals of the battery cells by the FPC structure.

[0057] 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.

[0058] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within 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 flexible printed circuit (FPC) structure, comprising: a body piece, which is provided with a plurality of connecting grooves in sequence along a first direction; a plurality of connecting pieces, one end of each of the plurality of connecting pieces being elastically connected to one of the plurality of connecting grooves, and the other end of each of the plurality of connecting pieces extending out of the connecting piece for connection with a busbar; a gap being provided between any end of the connecting piece along the first direction and the groove wall of the connecting groove; a plurality of expansion absorbing pieces, each of the plurality of expansion absorbing pieces being arranged in one of the plurality of gaps, and both ends of each of the expansion absorbing pieces being connected to the corresponding connecting piece and the groove wall of the connecting groove, respectively, the expansion absorbing piece being used to break when a battery cell expands along the first direction, so as to increase the spacing between two adjacent connecting pieces.

2. The FPC structure of claim 1, wherein, Each of the gaps is provided with one of the expansion absorbing pieces, and both ends of the expansion absorbing piece are connected to the groove wall of the connecting groove and the connecting piece, respectively.

3. The FPC structure of claim 2, wherein, The length of the expansion absorbing piece is not less than the size of the gap along the first direction.

4. The FPC structure of claim 3, wherein, Both sides of the expansion absorbing piece along the first direction are provided with a plurality of connecting ends, and the connecting ends are connected to the groove wall of the connecting groove or the connecting piece.

5. The FPC structure of claim 1, wherein, Each of the gaps is provided with at least two of the expansion absorbing pieces, and the lengths of the expansion absorbing pieces in each of the gaps are different.

6. The FPC structure of claim 5, wherein, The length of the expansion absorbing piece with the smallest length is not less than the size of the gap along the first direction.

7. The FPC structure according to any one of claims 1-6, wherein, The connecting piece comprises an extension, one end of the extension being connected to the connecting groove, the other end of the extension being capable of being connected to the busbar, both sides of the extension along the first direction being provided with the expansion absorbing piece, and the extension being capable of being stretched and contracted.

8. The FPC structure of claim 7, wherein, The shape of the extension is U-shaped, S-shaped, or V-shaped, so that the extension is capable of being stretched and contracted.

9. The FPC structure of claim 7, wherein, The connecting piece further comprises a connecting sheet, the connecting sheet being connected to the other end of the extension, and the connecting sheet being used to be connected to the busbar.

10. A battery pack characterized by The utility model relates to a flexible printed circuit (FPC) structure, comprising: any one of claims 1-9.

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