Fuse structure and signal acquisition device of power battery
By introducing an arc extinguishing layer and a film layer into the fuse structure of the power battery signal acquisition line, the problem of heat and arc generated by etching the fuse at low overload current is solved, the effect of reducing temperature and preventing ablation is achieved, and the power battery is improved security.
Patent Information
- Application Number
- CN202421226101.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-31
AI Technical Summary
In the signal acquisition line of the power battery, the etched fuse generates a large amount of heat when it is low overload current, resulting in poor phenomena such as carbonization of the substrate, bubbles, and combustion, which affects the safety of the power battery.
A fuse structure is designed, including a substrate layer, an etching line, an arc extinguishing layer and a film layer. The arc extinguishing layer covers the etching line, and the film layer is in the part where the substrate layer is not covered by the arc extinguishing layer. This structure reduces the temperature of the etching line by thermal conduction during low current overload, and absorbs arcs through the arc extinguishing material to prevent ablation of the substrate.
It effectively reduces the temperature of the etching line during low current overload, prevents arcing and ablation of the substrate, and improves the safety of the power battery.
Smart Images
Figure CN222462806U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of circuit protection elements, and relates to a fuse structure, in particular to a fuse structure formed by etching a circuit; and also relates to a signal acquisition device for a power battery having the fuse structure. Background Art
[0002] A fuse is a one-time component used to protect a circuit. When a fuse is connected to a circuit, when the current is too large, the fuse will melt due to the high temperature, thereby disconnecting the circuit to provide protection.
[0003] In the application of signal acquisition lines for power batteries, the fuse structure can etch thin lines on the copper foil of the FPC as a fuse to provide overcurrent protection (etched fuse). The lower layer of the copper foil is usually a flame-retardant and high-temperature resistant substrate as a carrier. Although etched fuses can also provide protection during overcurrent, etching lines will generate a lot of heat when low overload current occurs, resulting in carbonization, bubbles, combustion and other adverse phenomena of the substrate, affecting the safety of the power battery.
[0004] The above information disclosed in the Background section is only for enhancement of understanding of the background of the present application and therefore it may contain information that does not constitute the prior art that is already known to a person of ordinary skill in the art. Utility Model Content
[0005] In view of this, the utility model provides a fuse structure, which can reduce the temperature rise of the etching fuse when it is overloaded, and ensure the safe melting of the etching fuse. The utility model also provides a signal acquisition device of a power battery using the fuse structure.
[0006] According to a first aspect, the utility model provides a fuse structure, comprising a substrate layer and a fuse, wherein the fuse is an etched circuit arranged on the substrate layer, and the fuse structure further comprises an arc extinguishing layer and a film layer, wherein the arc extinguishing layer is stacked on the substrate layer and covers the etched circuit, and the film layer is stacked on a portion of the substrate layer not covered by the arc extinguishing layer.
[0007] In a preferred embodiment, the etching line extends longitudinally from one edge of the substrate layer to the edge of the opposite side, the etching line has one or more curved sections, and the width of the arc extinguishing layer is 1.5 to 2 times the maximum dimension of the etching line in the lateral direction.
[0008] In a more preferred embodiment, the length of the etching line in the longitudinal direction is equal to the length of the adhesive film layer.
[0009] In a preferred embodiment, the thickness of the arc extinguishing layer is greater than the thickness of the etched circuit.
[0010] In a preferred embodiment, the adhesive film layer includes a first adhesive film layer and a second adhesive film layer located on both lateral sides of the arc extinguishing layer, a window is formed between the first adhesive film layer and the second adhesive film layer, and the arc extinguishing layer is formed by curing the arc extinguishing material coated in the window.
[0011] In a more preferred embodiment, the thickness of the arc-extinguishing layer is greater than the thickness of the first adhesive film layer and the second adhesive film layer.
[0012] In a preferred embodiment, the substrate comprises a polyimide plate.
[0013] In a preferred embodiment, the etched circuit is an etched copper foil.
[0014] In a preferred embodiment, the arc-extinguishing layer is formed by curing an arc-extinguishing material printed on the substrate and the etched circuit.
[0015] In a preferred embodiment, the adhesive film is an insulating adhesive film.
[0016] According to the second aspect, the utility model provides a signal acquisition device for a power battery, comprising a circuit board and an overcurrent protection device arranged on the circuit board, the overcurrent protection device comprising the fuse structure, wherein the substrate layer of the overcurrent protection device is a part of the circuit board or is electrically connected to the circuit board.
[0017] The above solution adopted by the utility model has the following advantages:
[0018] The fuse structure of the utility model has an arc extinguishing layer stacked on the substrate, and the arc extinguishing layer is in direct contact with the etching circuit. When the current is low overloaded, the heat can be effectively conducted to reduce the temperature at the etching circuit. The arc generated when the etching circuit is disconnected is absorbed by the arc extinguishing material in the arc extinguishing layer, thereby reducing the energy of the overall arc and playing an arc extinguishing role. The problem of blistering of the coating under the condition of low current overload and the arc generated when the fuse is melted and causing the substrate to burn is solved. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 A schematic diagram of a fuse structure.
[0021] Figure 2The figure is an exploded schematic diagram of a fuse structure according to an embodiment of the utility model.
[0022] Figure 3 The figure is a top view of a fuse structure according to an embodiment of the utility model.
[0023] Figure 4 It is a side view of a fuse structure according to an embodiment of the utility model.
[0024] Figure 5 It is a schematic diagram of an arc extinguishing material printing screen according to an embodiment of the utility model.
[0025] in,
[0026] 100. Fuse structure;
[0027] 1. Base material layer; 2. Fuse; 20. Etched circuit; 201. Bending section; 3. Film layer; 4. Arc extinguishing layer;
[0028] 200, screen printing plate; 201, printing hole. DETAILED DESCRIPTION
[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.
[0030] In this document, the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.
[0031] Figure 1 FIG. 1 shows a fuse structure 100 before improvement used in a signal acquisition device for a power battery. Figure 1As shown, in the fuse structure 100 before the improvement, the film layer 3 is directly coated on the substrate layer 1, and the fuse 2 is composed of an etched circuit 20 formed by etching the copper foil on the substrate layer 1. The substrate layer 1 is specifically a PI (polyimide) film; the film layer 3 is a plastic film, which plays an insulating and protective role; the etched circuit 20 is a thin copper wire with multiple curved sections. The fuse 2 is sandwiched between the substrate layer 1 and the film layer 3, and the etched circuit 20 is directly in contact with the film layer 3. In actual application, the following problems occur: after a period of use, the PI film and the film layer 3 of the fuse structure 2 have carbonization, bubbles and combustion, which affect the safety of the power battery. The inventor analyzed and found that the main reason for this problem is that although the etched circuit 20 can play a protective role when overcurrent occurs, when a low overload current occurs, the etched circuit 20 will generate a lot of heat, resulting in carbonization, bubbles and combustion of the PI film and the film layer 3. Based on this, the following embodiment proposes an improved fuse structure 100.
[0032] Reference Figures 2 to 4 As shown, the improved fuse structure 100 includes a substrate layer 1 , a fuse 2 , a film layer 3 and an arc extinguishing layer 4 .
[0033] The substrate layer 1 is formed by cutting an insulating plate or an insulating sheet. In the specific example shown in the drawings, the substrate layer 1 is a substrate of an FPC circuit board. The substrate layer 1 includes a polyimide board, which has good flame retardancy and can withstand high temperatures.
[0034] The fuse 2 is an etched circuit 20 formed by etching the conductive layer. In the example shown in the figure, the conductive layer is a copper foil on the substrate layer 1, and the etched circuit 20 is formed by patterning and etching. Further, the etched circuit 20 is a thin copper wire formed by etching the copper foil. The etched circuit 20 extends from one edge of the substrate layer 1 to the edge of the opposite side in the longitudinal direction, and the etched circuit 20 has one or more curved sections 201, and the shape of the curved section 201 includes arc, square wave, sine wave or sawtooth shape.
[0035] The adhesive film layer 3 is specifically made of a plastic insulating film, which is formed by processing a flame-retardant plastic, and plays the role of flame retardancy and protecting the underlying substrate layer 1 .
[0036] The arc-extinguishing layer 4 is stacked on the substrate layer 1 and covers the etched circuit 20. The adhesive film layer 3 is stacked on the portion of the substrate layer 1 not covered by the arc-extinguishing layer 4. The adhesive film layer 3 includes a first adhesive film layer and a second adhesive film layer located on both sides of the arc-extinguishing layer 4 in the lateral direction, a window is formed between the first adhesive film layer and the second adhesive film layer, and the etched circuit 20 is located in the window. The arc-extinguishing layer 4 is formed by curing the arc-extinguishing material coated in the window. The coating process can adopt a screen printing process, and the curing can be high-temperature curing, such as baking curing.
[0037] like Figure 4As shown, the width of the arc extinguishing layer 4 is 1.5 to 2 times the maximum dimension of the etched circuit 20 in the horizontal direction. The thickness of the arc extinguishing layer 4 is greater than the thickness of the etched circuit 20, and the thickness of the arc extinguishing layer 4 is greater than the thickness of the first adhesive film layer 3 and the second adhesive film layer 3. The length of the etched circuit 20 in the vertical direction is equal to the length of the adhesive film layer 3.
[0038] When preparing the fuse structure 100, the fuse 2 is first etched on the substrate layer 1, and then the adhesive film layer 3 is attached to both sides of the fuse 2, and the edges of the adhesive film layer 3 on both sides are spaced a distance from the fuse 2 to form the above-mentioned window; then, the substrate layer 1 is covered with the following Figure 5 The printing screen 200 shown has printing holes 201 corresponding to the above-mentioned windows, and the shapes and positions of the windows between the film layer 3 and the printing holes 201 of the screen basically correspond to each other; the slurry of arc extinguishing material is printed at each printing hole 201, baked and cured to form an arc extinguishing layer 4.
[0039] This embodiment also relates to a signal acquisition device for a power battery, which includes a circuit board and an overcurrent protection device disposed on the circuit board, wherein the overcurrent protection device adopts the above-mentioned fuse structure 100, wherein the substrate layer 1 of the fuse structure 100 is a part of the circuit board or is electrically connected to the circuit board.
[0040] While the above embodiment has a low cost, an arc extinguishing layer 4 is stacked on the substrate, and the arc extinguishing layer 4 is in direct contact with the etched circuit 20. When a low current is overloaded, it can effectively conduct heat to reduce the temperature at the etched circuit 20. The arc generated when the etched circuit 20 is disconnected is absorbed by the arc extinguishing material in the arc extinguishing layer 4, thereby reducing the energy of the overall arc and playing an arc extinguishing role, solving the problem of blistering of the coating under low current overload conditions and arc generation during melting to cause substrate burning.
[0041] As shown in this specification and claims, the terms "comprises" and "include" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the relevant listed items.
[0042] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the accompanying drawings.
[0043] The above embodiment is only for illustrating the technical concept and features of the utility model, and is a preferred embodiment. Its purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent transformation or modification made according to the principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A fuse structure, comprising a substrate layer and a fuse, wherein the fuse is an etched circuit arranged on the substrate layer, characterized in that: The fuse structure further includes an arc extinguishing layer and a glue film layer. The arc extinguishing layer is stacked on the substrate layer and covers the etched circuit, and the glue film layer is stacked on a portion of the substrate layer not covered by the arc extinguishing layer.
2. The fuse structure according to claim 1, characterized in that: The etching line extends longitudinally from one edge of the substrate layer to the edge of the opposite side, the etching line has one or more bending sections, and the width of the arc extinguishing layer is 1.5 to 2 times the maximum dimension of the etching line in the transverse direction.
3. The fuse structure according to claim 2, characterized in that: The length of the etching line in the longitudinal direction is equal to the length of the adhesive film layer.
4. The fuse structure according to claim 1, characterized in that: The thickness of the arc extinguishing layer is greater than the thickness of the etching line.
5. The fuse structure according to claim 1, characterized in that: The adhesive film layer includes a first adhesive film layer and a second adhesive film layer located on both sides of the arc-extinguishing layer in the transverse direction, a window is formed between the first adhesive film layer and the second adhesive film layer, and the arc-extinguishing layer is formed by curing the arc-extinguishing material coated in the window.
6. The fuse structure according to claim 5, characterized in that: The thickness of the arc-extinguishing layer is greater than the thickness of the first adhesive film layer and the second adhesive film layer.
7. The fuse structure according to claim 1, characterized in that: The substrate comprises a polyimide plate, and the etching circuit is an etched copper foil.
8. The fuse structure according to claim 1 or 7, characterized in that: The arc extinguishing layer is formed by curing the arc extinguishing material printed on the substrate and the etching circuit.
9. The fuse structure according to claim 1, characterized in that: The adhesive film is an insulating adhesive film.
10. A signal acquisition device for a power battery, comprising a circuit board and an overcurrent protection device arranged on the circuit board, characterized in that: The overcurrent protection device comprises the fuse structure according to any one of claims 1 to 9, wherein the substrate layer of the overcurrent protection device is a part of the circuit board or is electrically connected to the circuit board.