Planar integrated busbar

Abstract

The utility model discloses a planar integrated busbar, which comprises a busbar and a sampling circuit board arranged on one side of the busbar, and is characterized in that the busbar comprises a first insulating layer, a second insulating layer, and an output conducting bar and a plurality of flexible conducting bars which are arranged between the first insulating layer and the second insulating layer; the sampling circuit board comprises a third insulating layer, a temperature sampling circuit and a voltage sampling circuit, wherein the temperature sampling circuit and the voltage sampling circuit are packaged between the third insulating layer and the second insulating layer. The voltage sampling circuit is electrically connected to the corresponding output conducting bar or the flexible conducting bar. The flexible conducting bar is simple in structure, the flexible conducting bar yields and plastically deforms under the action of expansion force of the battery at the end of the service life of the battery and cannot be broken, and the circulation of current is still ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a planar integrated busbar. Background Art

[0002] During the use of the battery pack, as the health of the battery / cell decreases, the middle part of the battery will gradually expand. The batteries are concentrated on the busbar composed of aluminum bars, and the battery expansion force is usually large. Although there is generally a gap between the batteries for expansion, at the end of the battery life, the distance between the batteries will still increase, and the aluminum bar will be stretched or even broken, resulting in the aluminum bar being unable to conduct, affecting the connection between the aluminum bar and the battery electrode. Therefore, improvements are needed. Utility Model Content

[0003] The utility model aims to provide a planar integrated busbar to overcome the deficiencies in the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The utility model discloses a planar integrated busbar, comprising a busbar and a sampling circuit board arranged on one side of the busbar, wherein the busbar comprises a first insulating layer, a second insulating layer, an output conductive busbar and a plurality of flexible conductive busbars arranged between the first insulating layer and the second insulating layer, the sampling circuit board comprises a third insulating layer, and a temperature sampling circuit and a voltage sampling circuit encapsulated between the third insulating layer and the second insulating layer, and the voltage sampling circuit is electrically connected to the corresponding output conductive busbar or the flexible conductive busbar.

[0006] Furthermore, in the above-mentioned planar integrated busbar, a plurality of welding windows are provided in the second insulating layer, and the welding windows form pads on the surfaces corresponding to the output conductive busbar and the flexible conductive busbar, and are electrically connected to the corresponding voltage sampling circuit.

[0007] Furthermore, in the above-mentioned planar integrated busbar, a avoidance window corresponding to the welding window is provided in the third insulating layer.

[0008] Furthermore, in the above-mentioned planar integrated busbar, one end of the sampling circuit board is connected to a connector, and one end of the temperature sampling circuit and one end of the voltage sampling circuit are both electrically connected to the connector.

[0009] Furthermore, in the above-mentioned planar integrated busbar, the flexible conductive bar includes a plurality of connection bars for connecting positive or negative electrodes of battery cells and a plurality of connection bars connected between adjacent connection bars, and the adjacent connection bars are arranged at intervals.

[0010] Furthermore, in the above-mentioned planar integrated busbar, the connecting strips and the connecting bar are integrally formed, and through grooves are provided between adjacent connecting strips.

[0011] Furthermore, in the above-mentioned planar integrated busbar, the through slot is in an arc-shaped, curved, broken-line, straight-line or wavy-line structure along its length direction.

[0012] Furthermore, in the above-mentioned planar integrated busbar, the sizes and shapes of the through slots are the same or different.

[0013] Furthermore, in the above-mentioned planar integrated busbar, the connecting bar and the connecting bar are separate structures, and two ends of the connecting bar are respectively electrically connected to the corresponding connecting bar.

[0014] Furthermore, in the above-mentioned planar integrated busbar, the connecting strip is in an arc-shaped, curved, broken-line, straight-line or wavy-line structure along its length direction.

[0015] Furthermore, in the above-mentioned planar integrated busbar, the sizes and shapes of the connecting bars are the same or different.

[0016] Compared with the prior art, the advantages of the present invention are: the present invention has a simple structure, adjacent connecting rows are connected by connecting strips, the connecting strips arranged at intervals form a spring-like effect, allowing elongation and compression, and when the battery cell expands, the corresponding adjacent connecting rows are flexibly connected and are not easily broken, thereby extending the life of the planar integrated busbar. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Shown is a schematic structural diagram of a planar integrated busbar in a specific embodiment of the utility model.

[0019] Figure 2 Shown is an exploded schematic diagram of a planar integrated busbar in a specific embodiment of the utility model.

[0020] Figure 3 Shown is a schematic structural diagram of a busbar in a specific embodiment of the present utility model.

[0021] Figure 4The figure shows a connection diagram of a temperature sampling circuit and a voltage sampling circuit with corresponding output conductive bars or flexible conductive bars in a specific embodiment of the present invention.

[0022] Figure 5 Shown is a schematic diagram of the structure of a temperature sampling circuit in a specific embodiment of the present utility model.

[0023] Figure 6 Shown is a schematic structural diagram of a sampling circuit board in a specific embodiment of the utility model.

[0024] Figure 7 The figure shows a first structural schematic diagram of a flexible conductive bar in a specific embodiment of the utility model.

[0025] Figure 8 The figure shows a second structural schematic diagram of the flexible conductive bar in a specific embodiment of the present utility model.

[0026] Fig. 9 Shown is a third structural schematic diagram of the flexible conductive bar in a specific embodiment of the utility model.

[0027] Fig.10 Shown is a fourth structural schematic diagram of the flexible conductive bar in a specific embodiment of the utility model.

[0028] Fig.11 The fifth structural schematic diagram of the flexible conductive bar in the specific embodiment of the utility model is shown. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to describe the technical solutions in the embodiments of the utility model in detail. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] 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.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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.

[0032] For example, see Figures 1 to 11 As shown, a planar integrated busbar includes a busbar 1 and a sampling circuit board 2 arranged on one side of the busbar 1, the busbar 1 includes a first insulating layer 11, a second insulating layer 12, and positive and negative output conductive bars 13 and a plurality of flexible conductive bars 14 arranged between the first insulating layer 11 and the second insulating layer 12, the sampling circuit board 2 includes a third insulating layer 21 and a temperature sampling circuit 22 and a voltage sampling circuit 23 encapsulated between the third insulating layer 21 and the second insulating layer 12, and the voltage sampling circuit 23 is electrically connected to the corresponding output conductive bar 13 or the flexible conductive bar 14.

[0033] In this technical solution, the sampling circuit board is a flexible circuit board, and the side close to the bus shares the second insulating layer with the bus. The first insulating layer, the second insulating layer and the third insulating layer are all made of existing PET (abbreviation of PolyethyleneTerephthalate, Chinese full name: polyethylene terephthalate) and other insulating materials, and are provided with a number of buffer holes. The output conductive row, the flexible conductive row, the temperature sampling circuit and the voltage sampling circuit are avoided at the buffer holes to avoid leakage and short circuit caused by exposure. When the bus and the sampling circuit board are subjected to tensile stress, they can be well buffered to improve the overall stability effect. In addition, the multi-layer PET can play a physical support role. The output conductive row, the flexible conductive row, the temperature sampling circuit and the voltage sampling circuit are all made of conductive materials, and the conductive materials include but are not limited to aluminum, copper, steel, nickel, composite materials and various alloys. The output conductive row and the flexible conductive row are provided with positioning holes corresponding to the battery cells, and the first insulating layer and the second insulating layer are provided with avoidance holes corresponding to the positioning holes, respectively, to facilitate the rapid positioning and installation of the battery cells. The temperature sampling circuit can use the structure recorded in the prior art, and use the NTC thermistor 221 (NTC is Negative Temperature Coefficient thermistor, short for temperature coefficient thermistor), etc., collects parameters such as the temperature of the output conductive bar and the flexible conductive bar, and transmits them to the control system of the battery module. The flexible conductive bar covers the upper surface of the entire battery tightly, and can help the battery dissipate heat through metal heat transfer. At the same time, the NTC on the sampling line is tightly fixed to the flexible conductive bar. The temperature of the battery can be directly transmitted to the NTC through the flexible conductive bar, which is convenient for collecting the battery temperature. At the end of the battery life, the flexible conductive bar yields and plastically deforms due to the expansion force of the battery, and will not break, so the current flow is still guaranteed.

[0034] For example, see Figures 2 to 4 As shown, a plurality of welding windows 122 are disposed in the second insulating layer 12 . The welding windows 122 form welding pads on the surfaces of the corresponding output conductive bars 13 and the flexible conductive bars 14 , and are electrically connected to the corresponding voltage sampling circuits 23 .

[0035] In this technical solution, the voltage sampling circuit, the output conductive bus and the flexible conductive bus are made of the same or different materials and are electrically connected by laser welding or other methods. The specific position of the welding window can be determined according to the actual working conditions of the battery pack, as long as the voltage sampling circuit can be electrically connected to the corresponding output conductive bus and the flexible conductive bus.

[0036] For example, see Figure 1 , Figure 2 Figure 6As shown, a avoidance window 211 corresponding to the welding window 122 is provided in the third insulating layer 21 .

[0037] In this technical solution, the avoidance window is used to weld the voltage sampling circuit to the corresponding pad using laser or the like to avoid damaging the third insulating layer during the welding process. After welding is completed, it can be packaged with insulating tape or the like, or covered with the third insulating layer after welding.

[0038] For example, see Figure 1 Figure 2 and Figure 4 As shown, one end of the sampling circuit board 2 is connected to a connector 3 , and one end of the temperature sampling circuit 22 and the voltage sampling circuit 23 are both electrically connected to the connector 3 .

[0039] In this technical solution, the connector is set at one end of the sampling circuit board by conventional means such as welding, and is used to connect the control system of the battery module.

[0040] For example, see Figure 2 , Figure 4 as well as Figures 7 to 11 As shown, the flexible conductive row 14 includes a plurality of connection rows 141 for connecting the positive or negative electrodes of the battery cells and a plurality of connection bars 142 connected between adjacent connection rows 141 , and adjacent connection bars 142 are arranged at intervals.

[0041] In this technical solution, the connecting row located between adjacent batteries is connected by a number of connecting strips arranged at intervals. The connecting strips arranged at intervals form a spring-like effect, allowing extension and compression. When the battery cell expands, the corresponding adjacent connecting rows are flexibly connected and are not easily broken, and the conductivity of the flexible conductive row can still be guaranteed. The connecting strip can also be used as a fuse, which will melt when the current exceeds the set value to protect the battery. When used as a fuse, the gap between the connecting rows is encapsulated with an injection-molded insulating flame-retardant sealant or potting agent to wrap the fuse to prevent electric sparks.

[0042] For example, see Figure 2 , Figure 4 as well as Figures 7 to 10 As shown, the connection bars 142 and the connection rows 141 are integrally formed, and through grooves are provided between adjacent connection bars 142 .

[0043] In this technical solution, adjacent connecting rows are made of the same aluminum plate / aluminum foil, and a number of through grooves are hollowed out between adjacent battery connection positions. The remaining parts between adjacent through grooves form connecting strips. The connecting strips arranged at intervals form a spring-like effect, allowing elongation and compression. When the battery cell expands, the corresponding adjacent connecting rows are flexibly connected and not easily broken, and the conductivity of the flexible conductive row can still be guaranteed.

[0044] For example, see Figures 7 to 10 As shown, the through slot is in an arc, curve, fold, straight or wavy shape along its length direction, and the size and shape of the through slot are the same or different.

[0045] In this technical solution, the through groove is a regular or irregular shape, such as an arc, curve, fold line, straight line and wavy line, etc. The through groove is a single structure or a mixture of two or more structures. The sizes of the through grooves are the same or different, and flexible connection between the connecting bars can be achieved. The flexible conductive bar is made of a relatively thin material as a whole, and can be produced on an assembly line using a coiled aluminum plate in combination with an existing circular knife or laser cutting machine, with high production efficiency. At the same time, due to its ability to be produced on a fully automatic assembly line, subsequent processes such as attaching an insulating layer can be fully automatically performed, saving labor costs and further improving production efficiency.

[0046] For example, see Fig.11 As shown, the connection bar 142 and the connection row 141 are separate structures, and two ends of the connection bar 142 are electrically connected to the corresponding connection row 141 respectively.

[0047] In this technical solution, the two ends of the connecting strip are respectively connected to the corresponding connecting rows by conventional means such as welding, and are electrically conductive with the connecting rows. Adjacent connecting strips are spaced apart, and there are no requirements for the shape (one or two of the arc-shaped, curved, broken line, straight line, or wavy line structures, and more than two of the same) and size (same or different) of the connecting strip, as long as flexible connection between adjacent connecting rows can be achieved.

[0048] To sum up, the utility model has a simple structure. Adjacent connecting rows are connected by connecting strips. The connecting strips arranged at intervals form a spring-like effect, allowing elongation and compression. When the battery cell expands, the corresponding adjacent connecting rows are flexibly connected and are not easily broken, thereby extending the life of the planar integrated busbar.

[0049] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0050] The above is only a specific implementation of the present utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A planar integrated busbar, characterized in that: It includes a bus and a sampling circuit board arranged on one side of the bus, the bus includes a first insulating layer, a second insulating layer, an output conductive bus and a plurality of flexible conductive buses arranged between the first insulating layer and the second insulating layer, the sampling circuit board includes a third insulating layer and a temperature sampling circuit and a voltage sampling circuit encapsulated between the third insulating layer and the second insulating layer, and the voltage sampling circuit is electrically connected to the corresponding output conductive bus or flexible conductive bus.

2. The planar integrated busbar according to claim 1, characterized in that: A plurality of welding windows are arranged in the second insulating layer. The welding windows form welding pads on the surfaces corresponding to the output conductive row and the flexible conductive row, and are electrically connected to the corresponding voltage sampling circuit.

3. The planar integrated busbar according to claim 2, characterized in that: The third insulating layer is provided with an avoidance window corresponding to the welding window.

4. The planar integrated busbar according to claim 1, characterized in that: One end of the sampling circuit board is connected to a connector, and one end of the temperature sampling circuit and the voltage sampling circuit are both electrically connected to the connector.

5. The planar integrated busbar according to any one of claims 1 to 4, characterized in that: The flexible conductive row includes a plurality of connection rows for connecting positive electrodes or negative electrodes of battery cells and a plurality of connection bars connected between adjacent connection rows, and adjacent connection bars are arranged at intervals.

6. The planar integrated busbar according to claim 5, characterized in that: The connecting strips and the connecting rows are integrally formed, and through grooves are arranged between adjacent connecting strips.

7. The planar integrated busbar according to claim 6, characterized in that: The through groove is in an arc shape, a curve shape, a broken line shape, a straight line shape or a wavy line shape along its length direction.

8. The planar integrated busbar according to claim 6, characterized in that: The sizes and shapes of the through slots are the same or different.

9. The planar integrated busbar according to claim 5, characterized in that: The connecting bar and the connecting row are separate structures, and two ends of the connecting bar are respectively electrically connected to the corresponding connecting row.

10. The planar integrated busbar according to claim 9, characterized in that: The connecting strip is in an arc shape, a curve shape, a broken line shape, a straight line shape or a wavy line shape along its length direction.

11. The planar integrated busbar according to claim 9, characterized in that: The sizes and shapes of the connecting strips are the same or different.

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