Battery signal sampling device and battery system

Abstract

The utility model provides a battery signal sampling device and a battery system, and belongs to the technical field of batteries, the battery sampling device comprises a flexible circuit board, the flexible circuit board comprises a circuit layer and two insulating layers, a main fusing unit and at least one auxiliary fusing unit arranged in parallel are arranged in a circuit of the circuit layer, and the auxiliary fusing unit comprises a bonding pad; the circuit layer is arranged between the two insulating layers, at least one insulating layer comprises a first insulating film and a second insulating film, the second insulating film is arranged opposite to the bonding pad, the first insulating film is connected with the second insulating film, and a micro-connection structure is arranged at the joint of the first insulating film and the second insulating film. The second insulating film opposite to the bonding pad is connected with the first insulating film through the tearing line, the second insulating film corresponding to the bonding pad can be quickly removed under the condition that the main fusing unit in the circuit is fused, the bonding pad is communicated so as to be communicated with the auxiliary fusing unit to repair the sampling loop, the operation is simple and quick, and the working efficiency is improved. And the maintenance cost and the maintenance difficulty are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technology field, concretely relates to a battery signal sampling device and battery system. BACKGROUND

[0002] With the vigorous promotion and popularization of power battery, the application of power battery is more and more mature and universal, in order to ensure the safety of power battery, voltage, temperature acquisition monitoring needs to be carried out to power battery unit.

[0003] Usually, flexible circuit board is used to collect and transmit battery voltage and temperature signals, then the voltage and temperature signals are transmitted to the battery sampling board, and a fuse is arranged in the voltage sampling loop for protection. At present, in order to avoid the situation that the circuit board cannot be repaired or replaced after the fuse fails, a backup fuse is generally arranged, and the backup fuse can be connected to the circuit through the solder pad.

[0004] At present, the flexible circuit board generally etches the circuit through etching process, then covers the upper and lower layers of the circuit with insulating film, and finally punches out the shape of the product. Since the solder pad is covered by the insulating film as a whole, the insulating film corresponding to the solder pad needs to be scraped off first, which is difficult to scrape off, and the circuit may be damaged during the scraping process, reducing the repair efficiency. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model solves the technical problem that in the prior art, when connecting the backup fuse, the insulating film corresponding to the solder pad needs to be scraped off first, which is difficult to scrape off and reduces the repair efficiency, so as to provide a battery signal sampling device and battery system.

[0006] In order to solve the above technical problems, the utility model provides a battery signal sampling device, which comprises a flexible circuit board, and the flexible circuit board comprises:

[0007] A circuit layer, a main fuse unit and at least one parallelly arranged auxiliary fuse unit are arranged in the circuit of the circuit layer, and the auxiliary fuse unit comprises a solder pad.

[0008] Two insulating layers, the circuit layer is arranged between the two insulating layers, at least one of the insulating layers comprises a first insulating film and a second insulating film, the first insulating film is arranged on the circuit layer, an opening is arranged on the first insulating film, the solder pad is located in the opening, the second insulating film is arranged on the solder pad, and the first insulating film and the second insulating film are connected through a micro-connection structure.

[0009] Optionally, the first insulating film and the second insulating film are integrally formed through die cutting.

[0010] And / or, the circuit layer is formed through die cutting.

[0011] Optionally, the thickness of the micro-connection structure is less than the thickness of the first insulating film or the second insulating film, and / or the micro-connection structure comprises spaced connection segments and disconnected segments.

[0012] Optionally, a gap is arranged between the first insulating film and the second insulating film, and the gap is connected by the micro-connection structure.

[0013] Optionally, the shape of the inside of the opening on the first insulating film matches the shape of the outside of the second insulating film, and the gap is arranged at the periphery of the second insulating film.

[0014] Optionally, the gap is arranged with equal width, and the width of the gap is 1mm-2mm.

[0015] Optionally, the pad comprises a first pad and a second pad, the auxiliary fuse unit further comprises a first fuse, the first pad is connected with the line connected with one end of the main fuse unit through the first fuse, the second pad is connected with the line connected with the other end of the main fuse unit, the first pad and the second pad can be conducted through a conducting member, or the auxiliary fuse unit further comprises a second fuse, the first pad is connected with the line connected with one end of the main fuse unit, the second pad is connected with the line connected with the other end of the main fuse unit, and the first pad and the second pad can be conducted through the second fuse.

[0016] Optionally, the second fuse is a patch fuse.

[0017] Optionally, after the auxiliary fuse unit is connected, a protective layer is arranged on the first pad and the second pad.

[0018] The utility model also provides a kind of battery system, comprising:

[0019] Battery unit;

[0020] The battery signal sampling device of any one of the above, the battery unit is electrically connected with the busbar of the battery signal sampling device.

[0021] The utility model technical scheme has the following advantages:

[0022] 1. The battery signal sampling device provided by the utility model, comprising a flexible circuit board, the flexible circuit board includes a circuit layer and two insulating layers arranged on the upper and lower surfaces thereof, the circuit layer is provided with a main fuse unit and at least one auxiliary fuse unit arranged in parallel in the circuit, the auxiliary fuse unit includes a pad, at least one insulating layer includes a first insulating film and a second insulating film connected by micro-connection, and the second insulating film is arranged opposite to the pad.

[0023] Through the second insulating film arranged opposite to the pad, and the micro-connection between the second insulating film and the first insulating film, in the case that the main fuse unit in the circuit is fused, the second insulating film corresponding to the pad can be quickly removed, the pad is connected to connect the auxiliary fuse unit for repair, the operation is simple and fast, and the maintenance cost and difficulty are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 It is a structure schematic view of one embodiment of the battery signal sampling device provided in embodiment 1 of the present application.

[0026] Figure 2 It is a schematic view of internal structure change of the circuit layer in embodiment 1.

[0027] Figure 3 It is a schematic view of internal structure change of the circuit layer in embodiment 2 of the present application.

[0028] Figure 4 It is a plan view of the gap between the first insulating film and the second insulating film in the battery signal sampling device provided in embodiment 1 of the present application.

[0029] Explanation of reference signs:

[0030] 1, circuit layer; 2, main fuse unit; 3, auxiliary fuse unit; 4, insulating layer; 5, first insulating film; 6, second insulating film; 7, first pad; 8, second pad; 9, first fuse; 10, circuit; 11, conducting piece; 12, second fuse; 13, bus bar; 14, collecting piece; 15, gap. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the term "first", "second", "third" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the term "first", "second", "third" is only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0035] Embodiment 1

[0036] The battery signal sampling device provided in the embodiment is used for signal sampling monitoring of battery cells in a battery system, and the main fuse unit 2 and the auxiliary fuse unit 3 are arranged to ensure the safety of the battery cells, and the structure of the insulating layer 4 improves the repair efficiency.

[0037] As Figure 1 and Figure 2 shown, a specific embodiment of the battery signal sampling device provided in the embodiment includes a flexible circuit board, the flexible circuit board includes a circuit layer 1 and two insulating layers 4, the circuit layer 1 is provided with a main fuse unit 2 and at least one auxiliary fuse unit 3 arranged in parallel in a circuit 10, the auxiliary fuse unit 3 includes a solder pad, the circuit layer 1 is arranged between the two insulating layers 4, at least one insulating layer 4 includes a first insulating film 5 and a second insulating film 6, the first insulating film 5 is arranged on the circuit layer 1, the first insulating film 5 is provided with an opening, the solder pad is located in the opening, the second insulating film 6 is arranged on the solder pad, and the first insulating film 5 and the second insulating film 6 are connected through a micro-connection structure.

[0038] It should be noted that the first insulating film 5 and the second insulating film 6 are connected by a micro-connection structure. It can be understood that the micro-connection structure refers to a structure that can connect the first insulating film 5 and the second insulating film 6 and facilitate separation. Compared with the integrated setting of the first insulating film 5 and the second insulating film 6, that is, the first insulating film 5 and the second insulating film 6 are different parts of the same insulating film, by setting the micro-connection structure, the first insulating film 5 and the second insulating film 6 can be easily separated.

[0039] Specifically, as shown in Figure 1 In the embodiment, the circuit layer 1 and the insulating layer 4 are both planar structures. The two insulating layers 4 are respectively arranged on the upper surface and the lower surface of the circuit layer 1. The pads are located at the middle position of the circuit layer 1. The first insulating film 5 in the insulating layer 4 above the circuit layer 1 covers the pads. The first insulating film 5 has an opening at the middle position. The second insulating film 6 is located in the opening of the first insulating film 5 and is connected to the first insulating film 5 through a micro-connection structure.

[0040] By arranging the second insulating film 6 opposite to the pads and connecting the second insulating film 6 and the first insulating film 5 through a micro-connection structure, when the main fuse unit 2 in the circuit 10 is fused, the operator can quickly separate through the micro-connection structure, so as to quickly remove the second insulating film 6 corresponding to the pads, connect the pads to connect the auxiliary fuse unit 3 to repair the circuit 10. It is simple and fast, which reduces the maintenance cost and difficulty.

[0041] The fuses in the main fuse unit 2 and the auxiliary fuse unit 3 play a protection role. When the signal circuit 10 has an abnormal current, the fuse can timely disconnect the loop to protect the battery. Specifically, the fuse can be a fuse or other elements with the same protection function.

[0042] Specifically, a notch is arranged at a position opposite to the pad on the first insulating film 5, and the size is matched. The second insulating film 6 is arranged in the notch, so that after the second insulating film 6 is torn off, the pad can be exposed from the notch; the pad can be circular, square or rectangular, and the corresponding pads are welded to complete the connection.

[0043] Specifically, the circuit layer 1 includes a plurality of circuits 10. The circuit 10 extends along the length direction of the flexible circuit board to be connected to the bus bar 13 corresponding to each battery cell. Generally, the second insulating film 6 is arranged in the insulating layer 4 located on the upper layer of the circuit layer 1.

[0044] The insulating layer 4 is arranged to insulate and protect the circuit layer 1. The insulating layer 4 is used for electrical isolation and protection of the circuit, and also increases the mechanical strength of the flexible circuit board, provides structural support and stability. Specifically, the insulating layer 4 can be an insulating PI film.

[0045] The second insulating film 6 can protect the pads and avoid the influence of pad oxidation on welding.

[0046] The battery signal sampling device provided by the embodiment has the first insulating film 5 and the second insulating film 6 integrally formed by die cutting, which improves the processing efficiency, meets special requirements, is suitable for the material of the insulating film, and is convenient to operate.

[0047] The battery signal sampling device provided by the embodiment has the circuit layer 1 formed by die cutting. The circuit layer 1 and the two insulating layers 4 are die cut respectively, and then are pressed to form the flexible circuit board.

[0048] As shown in the figure, Figure 1 The micro-connection structure provided between the first insulating film 5 and the second insulating film 6 can be a point-shaped, zigzag-shaped or the like tear line. In the embodiment, the tear line includes alternating connection sections and disconnection sections. The connection sections connect the first insulating film 5 and the second insulating film 6, and the disconnection sections separate the first insulating film 5 and the second insulating film 6. The tear line is not only convenient for the quick removal of the second insulating film 6, but also ensures the stable connection between the first insulating film 5 and the second insulating film 6.

[0049] In other embodiments, the thickness of the micro-connection structure is less than the thickness of the first insulating film 5 or the second insulating film 6. Since the thickness at the micro-connection structure is thin, the operator can easily separate the second insulating film 6 from the first insulating film 5 at the point-shaped tear line.

[0050] The battery signal sampling device provided by the embodiment has gaps 15 provided between the first insulating film 5 and the second insulating film 6, and the gaps 15 are connected by the micro-connection structure.

[0051] The battery signal sampling device provided by the embodiment has the shape of the inside of the opening on the first insulating film 5 matched with the shape of the outside of the second insulating film 6, and the gaps 15 are provided at the periphery of the second insulating film 6.

[0052] Specifically, as shown in the figure, Figure 4 In the embodiment, the second insulating film 6 is rectangular, and the gaps 15 are provided at the periphery of the second insulating film 6. The four edges of the second insulating film 6 are connected to the first insulating film 5 by the micro-connection structure, which prevents the second insulating film 6 from being raised when the two insulating layers 4 and the circuit layer 1 are hot pressed. In other embodiments, the gaps 15 can also be provided at the positions of some edges of the second insulating film 6, for example, the gaps 15 are provided at only one edge of the second insulating film 6, or the gaps 15 are provided at opposite edges of the second insulating film 6, or the gaps 15 are provided at adjacent three edges of the second insulating film 6.

[0053] The battery signal sampling device provided by the embodiment has the gaps 15 provided with the same width, and the width of the gaps 15 is 1mm-2mm.

[0054] Specifically, the length of each gap 15 in the embodiment corresponds to the length of the corresponding side of the second insulating film 6, and the width of the gap 15 is in the range of 1mm-2mm.

[0055] As shown in Figure 2 the battery signal sampling device provided by the embodiment, the pads include a first pad 7 and a second pad 8, and the auxiliary fuse unit 3 further includes a first fuse 9. The first pad 7 is connected to the line 10 connected to one end of the main fuse unit 2 through the first fuse 9, and the second pad 8 is connected to the line 10 connected to the other end of the main fuse unit 2. The first pad 7 and the second pad 8 can be conducted through a conducting member 11.

[0056] Specifically, the first pad 7 and the second pad 8 are arranged in a spaced manner, and the first insulating film 5 is arranged on the first pad 7 and the second pad 8. The first pad 7 and the second pad 8 arranged in a spaced manner control the on-off of the auxiliary fuse unit 3. When the main fuse unit 2 is normal, the first pad 7 and the second pad 8 do not operate, and the auxiliary fuse unit 3 is in an off state. When the main fuse unit 2 is fused, the first pad 7 and the second pad 8 need to be connected to make the auxiliary fuse unit 3 work.

[0057] The first fuse 9 and the main fuse unit 2 are arranged in parallel, and the conducting member 11 can be a 0-ohm resistor. The 0-ohm resistor is welded on the first pad 7 and the second pad 8 to connect the auxiliary fuse unit 3, that is, to repair the sampling circuit.

[0058] Among them, ultrasonic welding or laser welding is used for welding with the pad, so that the welding has high pulling force and peeling force after welding, which ensures the reliability of the welding connection.

[0059] The battery signal sampling device provided by the embodiment is provided with a protective layer on the auxiliary fuse unit 3. Specifically, the protective layer in the embodiment is a glue coating layer. After the auxiliary fuse unit 3 is connected, glue dispensing treatment is performed at the first pad 7 and the second pad 8. The glue dispensing treatment can prevent dust, water and oxidation, and also has an insulating effect.

[0060] As shown in Figure 1 the battery signal sampling device provided by the embodiment further includes a bus bar 13, and the bus bar 13 is connected to the line 10 of the line layer 1 through a collecting member 14. Specifically, the collecting member 14 is a nickel sheet or a copper sheet, which has good conductivity.

[0061] Embodiment 2

[0062] As shown in Figure 3As shown, one specific embodiment of the battery signal sampling device provided by the embodiment is provided, in addition to the specific structure of the auxiliary fuse unit 3, the rest of the structure is the same as that in the embodiment 1, in the embodiment, the auxiliary fuse unit 3 further comprises a second fuse 12, the first pad 7 is connected with the line 10 connected with one end of the main fuse unit 2, the second pad 8 is connected with the line 10 connected with the other end of the main fuse unit 2, the first pad 7 and the second pad 8 can be conducted through the second fuse 12.

[0063] Specifically, the second fuse 12 is a patch fuse. The patch fuse is convenient to install, only needs to be arranged in the auxiliary fuse unit 3 corresponding to the fuse-fused area of the main fuse unit 2, the function of the second fuse 12 is equivalent to that of the first fuse 9 in the embodiment 1, the difference lies in that in the embodiment, a plurality of first fuses 9 need not be arranged in advance.

[0064] Embodiment 3

[0065] One specific embodiment of the battery system provided by the embodiment comprises a battery unit and the battery signal sampling device in the embodiment 1 or the embodiment 2, and the battery unit is electrically connected with the busbar 13. The battery sampling device samples the voltage signal of the battery unit, completes the signal monitoring of the battery unit, and improves the safety of the battery unit.

[0066] Obviously, the above embodiments are only examples for clearly illustrating, and are not limited to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A battery signal sampling device, characterized by, The flexible circuit board comprises: a circuit layer (1) provided with a main fuse unit (2) and at least one parallelly arranged auxiliary fuse unit (3) in a circuit (10) of the circuit layer (1), the auxiliary fuse unit (3) comprising a pad; two insulating layers (4), the circuit layer (1) being arranged between the two insulating layers (4), at least one of the insulating layers (4) comprising a first insulating film (5) and a second insulating film (6), the first insulating film (5) being arranged on the circuit layer (1), the first insulating film (5) being provided with an opening, the pad being located in the opening, the second insulating film (6) being arranged on the pad, the first insulating film (5) and the second insulating film (6) being connected through a micro-connection structure.

2. The battery signal sampling device of claim 1, wherein, The first insulating film (5) and the second insulating film (6) are integrally formed through die cutting; And / or, the circuit layer (1) is formed through die cutting.

3. The battery signal sampling device of claim 1, wherein, The thickness of the micro-connection structure is less than the thickness of the first insulating film (5) or the second insulating film (6), and / or the micro-connection structure comprises spaced connection segments and disconnected segments.

4. The battery signal sampling device of claim 1, wherein, The first insulating film (5) and the second insulating film (6) are provided with gaps (15) therebetween, and the gaps (15) are connected through the micro-connection structure.

5. The battery signal sampling device of claim 4, wherein, The inner shape of the opening on the first insulating film (5) matches the outer shape of the second insulating film (6), and the gaps (15) are provided on the outer periphery of the second insulating film (6).

6. The battery signal sampling apparatus of claim 5, wherein, The gaps (15) are provided with the same width, and the width of the gaps (15) is 1mm-2mm.

7. The battery signal sampling device of any one of claims 1-6, wherein, The pad comprises a first pad (7) and a second pad (8), the auxiliary fuse unit (3) further comprising a first fuse (9), the first pad (7) being connected with the circuit (10) connected with one end of the main fuse unit (2), the second pad (8) being connected with the circuit (10) connected with the other end of the main fuse unit (2), the first pad (7) and the second pad (8) being conductive through a conductive member (11); Or, the auxiliary fuse unit (3) further comprises a second fuse (12), the first pad (7) being connected with the circuit (10) connected with one end of the main fuse unit (2), the second pad (8) being connected with the circuit (10) connected with the other end of the main fuse unit (2), the first pad (7) and the second pad (8) being conductive through the second fuse (12).

8. The battery signal sampling device of claim 7, wherein, The second fuse (12) is a chip fuse.

9. The battery signal sampling device of claim 7, wherein, The auxiliary fuse unit (3) is provided with a protective layer.

10. A battery system characterized by, The battery unit comprises: a battery unit; The battery signal sampling device of any one of claims 1-9, the battery unit being electrically connected with the bus bar (13) of the battery signal sampling device.

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