Integrated busbar structure and battery pack

Abstract

The utility model discloses an integrated busbar structure and a battery pack, and relates to the technical field of power batteries. The integrated busbar structure comprises a plurality of serially connected aluminum bars, a circuit connecting plate and a hot-pressing film substrate. And the series aluminum bar and the circuit connecting plate are fixed on the hot-pressing film substrate in a hot-pressing manner. The series aluminum bars are arranged in a row in the first direction. The circuit connecting board is arranged on one side of the series aluminum bar in the first direction. And the circuit connecting plate is electrically connected with the plurality of serially connected aluminum bars respectively. A connector is arranged at the end of the circuit connection board in the first direction. And the connector is fixed on the hot-pressing film substrate through the fixing bracket. The battery pack comprises the integrated busbar structure and the battery module. And the integrated busbar structures are fixed on two sides of the battery module. The battery module comprises battery cells which are sequentially arranged along a plurality of first directions, and the series aluminum bar is used for being connected with pole columns of the battery cells. High integration level can be realized, the fixing strength of the aluminum bar is ensured, the connection strength of the circuit board is increased, and abrasion caused by exposure of the circuit board is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and more specifically, to an integrated busbar structure and a battery pack. Background Art

[0002] The battery integrated busbar, also known as the CCS assembly, is installed on the battery pack and is used to collect the voltage signal and current signal of the battery pack and balance the voltage difference of the battery pack.

[0003] After research by the inventor, it is found that the existing integrated busbar structure generally adopts the blister or injection molding process, with low integration degree and low fixing strength of the aluminum bar; the end of the signal acquisition circuit board is exposed, with a risk of wear. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an integrated busbar structure and a battery pack, which can achieve high integration degree, ensure the fixing strength of the aluminum bar, increase the connection strength of the circuit board, and avoid wear caused by the exposure of the circuit board.

[0005] The embodiments of the utility model are implemented as follows:

[0006] In a first aspect, the utility model provides an integrated busbar structure, including a plurality of series-connected aluminum bars, a circuit connection board, and a hot-pressing film base. The series-connected aluminum bars and the circuit connection board are both hot-pressed and fixed on the hot-pressing film base. The series-connected aluminum bars are arranged in a row along a first direction, the circuit connection board is arranged on one side of the series-connected aluminum bars along the first direction, the circuit connection board is electrically connected to the plurality of series-connected aluminum bars respectively, a connector is arranged at the end of the circuit connection board along the first direction, and the connector is fixed on the hot-pressing film base through a fixing bracket.

[0007] In an optional embodiment, the circuit connection board is connected to the series-connected aluminum bar through a nickel sheet, a cantilever is arranged at the connection part of the circuit connection board and the nickel sheet, the cantilever is movably connected to the circuit connection board, and the nickel sheet is connected to the circuit connection board through the cantilever.

[0008] In an optional embodiment, it further includes an output pole, and the output pole is arranged at the end of the series-connected aluminum bar along the first direction.

[0009] In an optional embodiment, the output pole includes a fixed aluminum bar and a connecting copper bar. The fixed aluminum bar is hot-pressed and fixed on the hot-pressing film base, the connecting copper bar is welded on the fixed aluminum bar, and a connecting column is arranged on the connecting copper bar.

[0010] In an alternative embodiment, the fixed aluminum bar includes a first fixing plate and a second fixing plate, the first fixing plate and the second fixing plate are perpendicularly connected, the first fixing plate is heat-pressed and fixed on the heat-pressed film substrate, the connecting copper bar includes a first welding surface, a second welding surface and a connecting surface, the first welding surface and the second welding surface are both perpendicularly connected to the connecting surface, the first welding surface is welded to the first fixing plate, the second welding surface is welded to the second fixing plate, and the connecting column is fixed on the connecting surface.

[0011] In an alternative embodiment, the series aluminum bar is provided with positioning holes for positioning in cooperation with the battery module.

[0012] In an alternative embodiment, it further includes a heat-pressed film cover plate, which is heat-pressed and fixed to the heat-pressed film substrate for covering the series aluminum bar and the circuit connection board.

[0013] In an alternative embodiment, the heat-pressed film cover plate is provided with positioning grooves for positioning the series aluminum bar.

[0014] In an alternative embodiment, the circuit connection board is a flexible circuit board.

[0015] In a second aspect, the present utility model provides a battery pack, including the integrated busbar structure according to any one of the foregoing embodiments and a battery module. The integrated busbar structure is fixed on both sides of the battery module. The battery module includes battery cells arranged in sequence along a plurality of the first directions. The series aluminum bar is used to connect with the pole columns of the battery cells, so as to connect a plurality of the battery cells in series.

[0016] The beneficial effects of the embodiments of the present utility model are as follows:

[0017] The integrated busbar structure of the present utility model includes a plurality of series aluminum bars, a circuit connection board and a heat-pressed film substrate. The series aluminum bars and the circuit connection board are both heat-pressed and fixed on the heat-pressed film substrate. The series aluminum bars are arranged in a row along the first direction. The circuit connection board is arranged on one side of the series aluminum bars along the first direction. The circuit connection board is electrically connected to a plurality of series aluminum bars respectively. A connector is arranged at the end of the circuit connection board along the first direction. The connector is fixed on the heat-pressed film substrate through a fixing bracket. By heat-pressing and fixing the series aluminum bars and the circuit connection board on the heat-pressed film, sealing and insulation can be achieved, making the integrated busbar lightweight, ensuring high integration and the fixing strength of the aluminum bar; by arranging a connector at the end of the circuit connection board and integrating and fixing the connector on the heat-pressed film, it can prevent the circuit from being exposed and worn. The connector is used for electrical connection with other devices, which can ensure the stability of the circuit connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related accompanying drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Structural schematic diagram of the integrated busbar structure provided for the first embodiment of the present utility model;

[0020] Figure 2 Exploded view of the integrated busbar structure provided for the first embodiment of the present utility model;

[0021] Figure 3 For Figure 2 Enlarged view of part A in

[0022] Figure 4 Structural schematic diagram of the output pole provided for the first embodiment of the present utility model;

[0023] Figure 5 Structural schematic diagram of the integrated busbar structure provided for the second embodiment of the present utility model;

[0024] Figure 6 Exploded view of the integrated busbar structure provided for the second embodiment of the present utility model;

[0025] Figure 7 Structural schematic diagram of the battery pack provided for the third embodiment of the present utility model.

[0026] Icons: 100 - integrated busbar structure; 10 - hot-pressing film base; 11 - relief hole; 20 - series aluminum bar; 21 - positioning hole; 22 - arched structure; 30 - circuit connection board; 31 - fixing bracket; 32 - connector; 33 - cantilever; 34 - nickel sheet; 40 - output pole; 41 - fixing aluminum bar; 411 - first fixing plate; 412 - second fixing plate; 42 - connecting copper bar; 421 - first welding surface; 422 - second welding surface; 423 - connecting surface; 43 - connecting column; 50 - hot-pressing film cover plate; 51 - positioning groove; 200 - battery pack; 201 - battery module; 202 - battery cell. Detailed implementation manners

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0029] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0031] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] First Embodiment

[0034] Please refer to Figure 1 and Figure 2 In this embodiment, an integrated busbar structure 100 is provided, which includes a plurality of series-connected aluminum bars 20, a circuit connection board 30, and a hot-pressing film substrate 10. The series-connected aluminum bars 20 and the circuit connection board 30 are both hot-pressed and fixed on the hot-pressing film substrate 10. The series-connected aluminum bars 20 are arranged in a row along the first direction. The circuit connection board 30 is arranged on one side of the series-connected aluminum bars 20 along the first direction. The circuit connection board 30 is electrically connected to the plurality of series-connected aluminum bars 20 respectively. A connector 32 is arranged at the end of the circuit connection board 30 along the first direction. The connector 32 is fixed on the hot-pressing film substrate 10 through a fixing bracket 31.

[0035] Specifically, the integrated busbar structure 100 in this embodiment is used to be connected to the side of the battery module 201. It can be understood that the series-connected aluminum bars 20 are used to connect the battery cells 202 of the battery module 201 in series. The battery cells 202 of the battery module 201 are arranged in sequence along the first direction. The circuit connection board 30 is used to connect the plurality of series-connected aluminum bars 20, so as to collect the voltage signal and current signal of the battery module 201. A connector 32 is arranged at the end of the circuit connection board 30 in this embodiment. The connector 32 is used to supply power to or transmit signals to the circuit connection board 30. It can be understood that the connector 32 is used to connect an external device.

[0036] Furthermore, a relief hole 11 is formed on the hot-pressing film substrate 10. The position of the relief hole 11 corresponds to the position of the series-connected aluminum bars 20. It can be understood that in this embodiment, the series-connected aluminum bars 20 are directly connected to the battery module 201.

[0037] Please refer to Figure 3 . In this embodiment, the circuit connection board 30 and the series-connected aluminum bars 20 are connected through a nickel sheet 34. A cantilever 33 is arranged at the connection part of the circuit connection board 30 and the nickel sheet 34. The cantilever 33 is movably connected to the circuit connection board 30. The nickel sheet 34 is connected to the circuit connection board 30 through the cantilever 33. Specifically, both ends of the nickel sheet 34 are welded to the cantilever 33 and the series-connected aluminum bars 20 respectively. In this embodiment, the cantilever 33 is a part of the circuit connection board 30, and a movable cantilever 33 is formed by grooving on the circuit connection board 30. In this embodiment, one end of the nickel sheet 34 is welded to the cantilever 33, so as to be connected to the circuit connection board 30. It can be understood that setting the movable cantilever 33 can absorb the expansion force generated by the expansion of the battery cell 202. When the battery cell 202 expands and drives the series-connected aluminum bars 20 to move, it will not drive the circuit connection board 30 to move, improving the connection strength.

[0038] Further, an arch structure 22 is provided in the middle of the series aluminum bar 20 in this embodiment, which can further absorb the expansion force of the expansion of the battery cell 202. The series aluminum bar 20 mainly acts between adjacent battery cells 202. When the distance between adjacent battery cells 202 changes due to expansion, the arch structure 22 can undergo a certain deformation, thereby ensuring the stable connection between the series aluminum bar 20 and the battery cell 202.

[0039] Please continue to refer to Figure 1 and Figure 2 . Since the battery cells 202 of the battery module 201 are connected in series by the series aluminum bar 20 in this embodiment, an output terminal will be formed at the end. Therefore, the integrated busbar structure 100 in this embodiment further includes an output pole 40. The output pole 40 is provided at the end of the series aluminum bar 20 along the first direction. It can be understood that the output pole 40 is electrically connected to the battery cell 202 at the end of the battery module 201. The output pole 40 is used for electrical connection with an external device. In this embodiment, the number of output poles 40 is two, which are respectively provided at both ends of the integrated busbar structure 100.

[0040] Please refer to Figure 1 and 4 . Specifically, the output pole 40 includes a fixed aluminum bar 41 and a connecting copper bar 42. The fixed aluminum bar 41 is thermally pressed and fixed on the thermocompression film substrate 10. The connecting copper bar 42 is welded to the fixed aluminum bar 41. A connecting column 43 is provided on the connecting copper bar 42. The connecting column 43 is used for external connection to a copper bar and can be used for series connection with other battery modules 201.

[0041] Please refer to Figure 4 . Further, the fixed aluminum bar 41 includes a first fixing plate 411 and a second fixing plate 412. The first fixing plate 411 and the second fixing plate 412 are vertically connected. It can be understood that the fixed aluminum bar 41 is an "L"-shaped sheet. The first fixing plate 411 is thermally pressed and fixed on the thermocompression film substrate 10. The connecting copper bar 42 includes a first welding surface 421, a second welding surface 422 and a connecting surface 423. The first welding surface 421 and the second welding surface 422 are both vertically connected to the connecting surface 423. The first welding surface 421 is welded to the first fixing plate. The second welding surface 422 is welded to the second fixing plate 412. It can be understood that compared with a single-sided welding structure, by performing double-sided welding on the connecting copper bar 42 and the fixed aluminum bar 41, the strength is higher, which can ensure that the connecting surface 423 will not be deformed, thereby improving the connection stability with the external copper bar.

[0042] Please refer to Figure 1 and Figure 2, positioning holes 21 are also formed in the series-connected aluminum bar 20 for positioning cooperation with the battery module 201. When it is necessary to connect the series-connected aluminum bar 20 to the battery cells 202 of the battery module 201, the series-connected aluminum bar 20 is covered on the battery cells 202, and the positioning holes 21 of the series-connected aluminum bar 20 are matched with the positioning structure of the battery cells 202, such as a positioning post or other structures, to position the series-connected aluminum bar 20.

[0043] Furthermore, the integrated busbar structure 100 further includes a hot-pressing film cover plate 50. The hot-pressing film cover plate 50 is hot-pressed and fixed to the hot-pressing film base 10 for covering the series-connected aluminum bar 20 and the circuit connection board 30. It can be understood that the hot-pressing film cover plate 50 and the hot-pressing film base 10 press and fix the series-connected aluminum bar 20 and the circuit connection board 30, further fixing the series-connected aluminum bar 20 and the circuit connection board 30.

[0044] Positioning grooves 51 are formed in the hot-pressing film cover plate 50 for positioning the series-connected aluminum bar 20. It can be understood that after structures such as the series-connected aluminum bar 20 and the circuit connection board 30 are fixed on the hot-pressing film base 10, the hot-pressing film cover plate 50 is then covered on the hot-pressing film base 10. At this time, the positioning grooves 51 are aligned with the series-connected aluminum bar 20. When the series-connected aluminum bar 20 is placed into the positioning grooves 51, the hot-pressing film cover plate 50 fits with the hot-pressing film base 10, enabling hot-pressing fixation.

[0045] The circuit connection board 30 in this embodiment is a flexible circuit board, which can undergo a certain amount of deformation and has the characteristics of high wiring density, light weight, thin thickness, and good bendability.

[0046] Second Embodiment

[0047] Please refer to Figure 5 and Figure 6 , this embodiment provides an integrated busbar structure 100, which is substantially the same as the integrated busbar structure 100 provided in the above first embodiment, except that:

[0048] The integrated busbar structure 100 in this embodiment does not include the output pole 40 at the end. It can be understood that the integrated busbar structure 100 in this embodiment and the integrated busbar structure 100 in the above first embodiment are arranged on the same battery module 201. The output ends of the battery module 201 are located on the same side.

[0049] Optionally, in other embodiments, when the output ends of the battery module 201 are located on opposite sides, that is, the two output ends are respectively located on both sides of the battery module 201, the output poles 40 can be respectively arranged on the integrated busbar structures 100 on both sides of the battery module 201, that is, one output pole 40 is respectively arranged on each of the two integrated busbar structures 100.

[0050] Third Embodiment

[0051] Please refer toFigure 7 , this embodiment provides a battery pack 200, which includes the busbar structures and battery modules 201 of the above first and second embodiments. The integrated busbar structure 100 is fixed on both sides of the battery module 201. The battery module 201 includes a plurality of battery cells 202 arranged in sequence along a first direction. The series aluminum bar 20 is used to connect to the pole posts of the battery cells 202, thereby connecting a plurality of battery cells in series.

[0052] The beneficial effects of the integrated busbar structure 100 of the battery pack 200 of the present utility model are:

[0053] The integrated busbar structure 100 of the present utility model includes a plurality of series aluminum bars 20, a circuit connection board 30, and a hot-pressing film base 10. The series aluminum bars 20 and the circuit connection board 30 are both hot-pressed and fixed on the hot-pressing film base 10. The series aluminum bars 20 are arranged in a row along the first direction. The circuit connection board 30 is arranged on one side of the series aluminum bars 20 along the first direction. The circuit connection board 30 is electrically connected to the plurality of series aluminum bars 20 respectively. A connector 32 is arranged at the end of the circuit connection board 30 along the first direction. The connector 32 is fixed on the hot-pressing film base 10 through a fixing bracket 31. By hot-pressing and fixing the series aluminum bars 20 and the circuit connection board 30 on the hot-pressing film, sealing and insulation can be achieved, making the integrated busbar lightweight, ensuring high integration and the fixing strength of the aluminum bar; by arranging the connector 32 at the end of the circuit connection board 30 and integrating and fixing the connector 32 on the hot-pressing film, it can prevent the circuit from being exposed and worn. The connector 32 is used to electrically connect to other devices, which can ensure the stability of the circuit connection.

[0054] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An integrated busbar structure, characterized in that: It includes a plurality of series aluminum bars, a circuit connection board and a hot pressing film base, wherein the series aluminum bars and the circuit connection board are both hot pressed and fixed on the hot pressing film base, the series aluminum bars are arranged in a row along a first direction, the circuit connection board is arranged on one side of the series aluminum bars along the first direction, the circuit connection board is electrically connected to the plurality of series aluminum bars respectively, a connector is arranged at the end of the circuit connection board along the first direction, and the connector is fixed to the hot pressing film base through a fixing bracket.

2. The integrated busbar structure according to claim 1, characterized in that: The circuit connection plate is connected to the series aluminum bar through a nickel sheet. A cantilever is provided at the connection between the circuit connection plate and the nickel sheet. The cantilever is movably connected to the circuit connection plate. The nickel sheet is connected to the circuit connection plate through the cantilever.

3. The integrated busbar structure according to claim 1, characterized in that: It also includes an output pole, which is arranged at the end of the series aluminum bar along the first direction.

4. The integrated busbar structure according to claim 3, characterized in that: The output pole includes a fixed aluminum bar and a connecting copper bar. The fixed aluminum bar is fixed on the hot pressing film substrate by hot pressing. The connecting copper bar is welded on the fixed aluminum bar. The connecting copper bar is provided with a connecting column.

5. The integrated busbar structure according to claim 4, characterized in that: The fixed aluminum bar includes a first fixed plate and a second fixed plate, the first fixed plate and the second fixed plate are vertically connected, the first fixed plate is hot-pressed and fixed on the hot-pressed film base, the connecting copper bar includes a first welding surface, a second welding surface and a connecting surface, the first welding surface and the second welding surface are both vertically connected to the connecting surface, the first welding surface is welded to the first fixed plate, the second welding surface is welded to the second fixed plate, and the connecting column is fixed on the connecting surface.

6. The integrated busbar structure according to claim 1, characterized in that: The series aluminum bars are provided with positioning holes for cooperating with the battery modules for positioning.

7. The integrated busbar structure according to claim 1, characterized in that: It also includes a hot pressing film cover plate, which is hot pressed and fixed to the hot pressing film base, and is used to cover the series aluminum bar and the circuit connection board.

8. The integrated busbar structure according to claim 7, characterized in that: The hot pressing film cover plate is provided with a positioning groove for positioning the series-connected aluminum bars.

9. The integrated busbar structure according to claim 1, characterized in that: The circuit connection board is a flexible circuit board.

10. A battery pack, characterized in that: It comprises an integrated busbar structure and a battery module as described in any one of claims 1 to 9, wherein the integrated busbar structure is fixed on both sides of the battery module, the battery module comprises a plurality of battery cells arranged in sequence along the first direction, and the series aluminum bar is used to be connected to the poles of the battery cells, thereby connecting a plurality of the battery cells in series.

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