Integrated busbar and battery pack

Abstract

The utility model belongs to the field of energy storage, and particularly provides an integrated busbar which comprises a busbar body and a flexible circuit board. The flexible circuit board is fixedly arranged on the busbar body; the flexible circuit board is provided with an active equalization circuit. By arranging the active equalization circuit to equalize the battery cells, compared with passive equalization, the energy utilization efficiency is improved, the power consumption is reduced, the equalization time is shortened, the battery consistency is improved, and the service life of the batteries is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of energy storage, specifically to an integrated busbar and battery pack Background Art

[0002] When the wiring harness busbar is connected to the battery pack, each wiring harness reaches one electrode, and multiple wiring harnesses are required to coordinate with multiple current signals in the power battery pack, occupying a larger battery pack space. In addition, the wiring harness relies on manual fixing of the port when assembling the battery pack, and the degree of automation is low.

[0003] Therefore, integrated busbars that use FPC flexible circuit boards to replace traditional battery wiring harnesses are widely used.

[0004] The battery pack in the related art adopts a single-layer integrated busbar design, which is responsible for battery voltage, temperature acquisition and battery balancing function control at the same time, and the balancing method mostly adopts passive balancing, the balancing current is about 100mA, and the balancing time is long. The passive balancing method can only balance the battery cells with high power to those with low energy, but not the other way around; and the balanced power is dissipated through the bypass resistor, resulting in low system power utilization and high power consumption.

[0005] The above problems need to be solved urgently. Utility Model Content

[0006] The purpose of the utility model is to provide an integrated busbar and battery pack.

[0007] In order to solve the above technical problems, the utility model provides an integrated busbar, comprising:

[0008] Busbar body and flexible circuit board;

[0009] The flexible circuit board is fixedly arranged on the busbar body;

[0010] An active balancing circuit is arranged on the flexible circuit board.

[0011] Furthermore, the busbar body is provided with a plurality of connecting pieces;

[0012] The connecting pieces are arranged on both sides of the flexible circuit board;

[0013] The flexible circuit board is electrically connected to the connecting sheet;

[0014] The connecting piece is used to connect the external battery cells in series.

[0015] Furthermore, the flexible circuit board includes: a first FPC board and a second FPC board;

[0016] After the first FPC board and the second FPC board are stacked, they are electrically connected to the corresponding connecting sheets;

[0017] The active equalization circuit is arranged on the first FPC board.

[0018] Furthermore, the flexible circuit board further includes: a sampling circuit;

[0019] The sampling circuit is arranged on the second FPC board.

[0020] Furthermore, an insulating adhesive backing board is provided between the first FPC board and the second FPC board.

[0021] Furthermore, a plurality of first nickel sheets are arranged on the first FPC board;

[0022] The second FPC board is provided with a plurality of second nickel sheets;

[0023] After the first FPC board and the second FPC board are stacked, the first nickel sheet overlaps with the corresponding second nickel sheet and is welded on the corresponding connecting sheet.

[0024] Furthermore, a fixed nickel sheet is provided on the insulating adhesive backing plate;

[0025] The fixed nickel sheet is arranged alternately with the first nickel sheet and the second nickel sheet.

[0026] Furthermore, the active equalization circuit includes:

[0027] N equalization units;

[0028] The balancing units are respectively connected in parallel at both sides of two adjacent battery cells that are externally connected in series.

[0029] Furthermore, the balancing unit includes: an inductor L1, an inductor L2, a capacitor C1, a switch tube Q1 and a switch tube Q2;

[0030] The inductor L1 is connected in series with the switch tube Q1 and then connected in parallel to the corresponding external battery cell;

[0031] The inductor L2 is connected in series with the switch tube Q2 and then connected in parallel to the corresponding external battery cell;

[0032] The switch tube Q1 and the switch tube Q2 are electrically connected between two adjacent battery cells after being connected in series externally;

[0033] Two ends of the capacitor C1 are electrically connected between the inductor L1 and the switch tube Q1 and between the inductor L2 and the switch tube Q2 respectively.

[0034] The utility model also provides a battery pack, comprising:

[0035] Box, battery pack and integrated busbar as described above;

[0036] The battery pack is fixedly disposed in the box;

[0037] The integrated busbar is fixedly disposed on the battery pack and is electrically connected to the positive and negative electrodes of the battery cells in the battery pack, thereby connecting the battery cells in the battery pack in series.

[0038] The beneficial effect of the utility model is that the utility model provides an integrated busbar, including: a busbar body and a flexible circuit board; the flexible circuit board is fixedly arranged on the busbar body; and an active balancing circuit is arranged on the flexible circuit board. By arranging the active balancing circuit to balance the battery cells, compared with passive balancing, the energy utilization efficiency is improved, the power consumption is reduced, the balancing time is shortened, the battery consistency is improved, and the battery life is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0040] Figure 1 It is a structural schematic diagram of the integrated busbar provided in an embodiment of the utility model.

[0041] Figure 2 It is an exploded view of the flexible circuit board provided by the embodiment of the utility model.

[0042] Figure 3 It is a circuit diagram of an active equalization circuit provided by an embodiment of the utility model.

[0043] Figure 4 It is a schematic diagram of circuit conduction of mode 1 and mode 2 of the balancing unit provided by the embodiment of the utility model during balancing.

[0044] In the figure: 100, busbar body; 110, connecting plate; 200, flexible circuit board; 210, first FPC board; 211, first nickel sheet; 220, second FPC board; 221, second nickel sheet; 230, insulating adhesive backing board; 231, fixed nickel sheet; 240, substrate. DETAILED DESCRIPTION

[0045] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0046] For examples, see Figure 1-Figure 3This embodiment provides an integrated busbar, including: a busbar body 100 and a flexible circuit board 200; the flexible circuit board 200 is fixedly arranged on the busbar body 100; and an active balancing circuit is arranged on the flexible circuit board 200. By balancing the cells by setting an active balancing circuit, compared with passive balancing, energy utilization efficiency is improved, power consumption is reduced, balancing time is shortened, battery consistency is improved, and battery life is increased.

[0047] The composition of the active balancing circuit is described below: In this embodiment, the active balancing circuit includes: N balancing units; the balancing units are respectively connected in parallel on both sides of two adjacent battery cells after external series connection.

[0048] Among them, the balancing unit includes: an inductor L1, an inductor L2, a capacitor C1, a switch tube Q1 and a switch tube Q2; after the inductor L1 is connected in series with the switch tube Q1, it is connected in parallel to the corresponding external battery cell; after the inductor L2 is connected in series with the switch tube Q2, it is connected in parallel to the corresponding external battery cell; the switch tube Q1 and the switch tube Q2 are electrically connected between two adjacent battery cells after the external series connection; the two ends of the capacitor C1 are respectively electrically connected between the inductor L1 and the switch tube Q1 and between the inductor L2 and the switch tube Q2.

[0049] The switch tube Q1 and the switch tube Q2 are controlled by a battery management system (BMS).

[0050] The equalization mode of the equalization unit is as follows Figure 4 As shown, when VB1>VB2 voltage, it is necessary to transfer the energy of cell B1 to cell B2 for charging. The switch tube Q1 and the switch tube Q2 are set to be complementary on and off, so that the switch tube Q1 is turned on and the switch tube Q2 is turned off. The cell B1, the inductor L1, and the switch tube Q1 form a loop, and the cell B1 charges the inductor L1. At the same time, the cell B2, the inductor L2, the capacitor C1, and the switch tube Q1 form a loop, and the capacitor C1 charges the cell B2 and the inductor L2 through this loop. Then the switch tube Q2 is turned on and the switch tube Q1 is turned off, and the cell B2, the inductor L2, and the switch tube Q2 form a loop. At this time, the energy stored in L2 charges the cell B2 through this loop. At the same time, the cell B1, the inductor L1, the capacitor C1, and the switch tube Q2 form a loop. At this time, the battery B1 and the inductor L1 charge the capacitor C1 at the same time. The cycle is repeated to achieve voltage balance between the cell B1 and the cell B2.

[0051] In order to improve the stability of the electrical connection between the integrated busbar and the battery cell, in the present embodiment, the busbar body 100 is provided with a plurality of connecting plates 110; the connecting plates 110 are arranged on both sides of the flexible circuit board 200; the flexible circuit board 200 is electrically connected to the connecting plates 110; the connecting plates 110 are used to connect the external battery cells in series.

[0052] In this embodiment, the flexible circuit board 200 includes: a first FPC board 210 and a second FPC board 220; after the first FPC board 210 and the second FPC board 220 are stacked, they are electrically connected to the corresponding connecting piece 110; the active balancing circuit is arranged on the substrate 240 of the first FPC board 210. Among them, the flexible circuit board 200 also includes: a sampling circuit; the sampling circuit is arranged on the substrate 240 of the second FPC board 220. The second FPC board 220 is responsible for collecting voltage, and the NTC collects temperature. The first FPC board 210 is responsible for balancing control, and active balancing is adopted. Sampling and balancing are independent of each other and do not affect each other, which improves the stability of the BMS.

[0053] In this embodiment, an insulating adhesive backing plate 230 is disposed between the first FPC board 210 and the second FPC board 220. The insulating adhesive backing plate 230 is provided to support the first FPC board 210 and the second FPC board 220 on the one hand, and to separate the first FPC board 210 and the second FPC on the other hand to prevent short circuit.

[0054] In this embodiment, a plurality of first nickel sheets 211 are provided on the first FPC board 210; a plurality of second nickel sheets 221 are provided on the second FPC board 220; after the first FPC board 210 and the second FPC board 220 are stacked, the first nickel sheets 211 overlap with the corresponding second nickel sheets 221 and are welded to the corresponding connecting sheet 110. A fixed nickel sheet 231 is provided on the insulating adhesive backing board 230; the fixed nickel sheet 231 is staggered with the first nickel sheet 211 and the second nickel sheet 221. The fixed nickel sheet 231 fixes the insulating adhesive backing board 230.

[0055] This embodiment also provides a battery pack, comprising: a case, a battery pack and an integrated busbar as described above; the battery pack is fixedly disposed in the case; the integrated busbar is fixedly disposed on the battery pack and is electrically connected to the positive and negative electrodes of the battery cells in the battery pack, thereby connecting the battery cells in the battery pack in series.

[0056] In summary, the utility model provides an integrated busbar, including: a busbar body 100 and a flexible circuit board 200; the flexible circuit board 200 is fixedly arranged on the busbar body 100; and an active balancing circuit is arranged on the flexible circuit board 200. By arranging the active balancing circuit to balance the battery cells, compared with passive balancing, the energy utilization efficiency is improved, the power consumption is reduced, the balancing time is shortened, the battery consistency is improved, and the battery life is increased.

[0057] All devices (parts without specific structure) selected in this application are universal standard parts or parts known to those skilled in the art, and their structures and principles can be known by those skilled in the art through technical manuals or conventional experimental methods. In addition, the software programs involved in this application are all prior art, and this application does not involve any improvement to the software programs.

[0058] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0060] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0061] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0062] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0063] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An integrated busbar, characterized in that: include: Busbar body and flexible circuit board; The flexible circuit board is fixedly arranged on the busbar body; An active balancing circuit is arranged on the flexible circuit board.

2. The integrated busbar according to claim 1, characterized in that: The busbar body is provided with a plurality of connecting pieces; The connecting pieces are arranged on both sides of the flexible circuit board; The flexible circuit board is electrically connected to the connecting sheet; The connecting piece is used to connect the external battery cells in series.

3. The integrated busbar according to claim 2, characterized in that: The flexible circuit board comprises: a first FPC board and a second FPC board; After the first FPC board and the second FPC board are stacked, they are electrically connected to the corresponding connecting sheets; The active equalization circuit is arranged on the first FPC board.

4. The integrated busbar according to claim 3, characterized in that: The flexible circuit board further includes: a sampling circuit; The sampling circuit is arranged on the second FPC board.

5. The integrated busbar according to claim 3, characterized in that: An insulating adhesive backing plate is arranged between the first FPC board and the second FPC board.

6. The integrated busbar according to claim 5, characterized in that: The first FPC board is provided with a plurality of first nickel sheets; The second FPC board is provided with a plurality of second nickel sheets; After the first FPC board and the second FPC board are stacked, the first nickel sheet overlaps with the corresponding second nickel sheet and is welded on the corresponding connecting sheet.

7. The integrated busbar according to claim 6, characterized in that: The insulating adhesive backing plate is provided with a fixed nickel sheet; The fixed nickel sheet is arranged alternately with the first nickel sheet and the second nickel sheet.

8. The integrated busbar according to claim 1, characterized in that: The active equalization circuit comprises: N equalization units; The balancing units are respectively connected in parallel at both sides of two adjacent battery cells that are externally connected in series.

9. The integrated busbar according to claim 8, characterized in that: The balancing unit includes: an inductor L1, an inductor L2, a capacitor C1, a switch tube Q1 and a switch tube Q2; The inductor L1 is connected in series with the switch tube Q1 and then connected in parallel to the corresponding external battery cell; The inductor L2 is connected in series with the switch tube Q2 and then connected in parallel to the corresponding external battery cell; The switch tube Q1 and the switch tube Q2 are electrically connected between two adjacent battery cells after being connected in series externally; Two ends of the capacitor C1 are electrically connected between the inductor L1 and the switch tube Q1 and between the inductor L2 and the switch tube Q2 respectively.

10. A battery pack, characterized in that: include: A box, a battery pack, and an integrated busbar as claimed in any one of claims 1 to 9; The battery pack is fixedly disposed in the box; The integrated busbar is fixedly disposed on the battery pack and is electrically connected to the positive and negative electrodes of the battery cells in the battery pack, thereby connecting the battery cells in the battery pack in series.

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