Pressure sampling nickel sheet integrated fuse structure for pressure sampling system

Abstract

The utility model relates to the technical field of battery voltage sampling systems, in particular to a voltage sampling nickel sheet integrated fuse structure for a voltage sampling system. Comprising a voltage sampling nickel sheet and a flexible circuit board stacked on the voltage sampling nickel sheet. The voltage sampling nickel sheet is mounted at the electrode end of the battery, the flexible circuit board is provided with a first copper sheet and a second copper sheet, the first copper sheet is used for connecting a voltage sampling system, the second copper sheet is used for connecting the voltage sampling nickel sheet, and a fuse is etched between the first copper sheet and the second copper sheet. Compared with the prior art, the fuse is etched in the flexible circuit board, so that the production yield can be improved; meanwhile, the flexible circuit board is stacked on the voltage sampling nickel sheet and is connected with the voltage sampling nickel sheet, and the voltage sampling nickel sheet is mounted at the electrode end of the battery, so that the flexible circuit board can be arranged closer to the electrode end, the current path can be shortened, the current state of the battery end can be monitored more directly, and a circuit can be quickly fused and cut off; and the damage of abnormal current to the single batteries or the whole battery pack can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery pressure acquisition system technical field especially a kind of pressure acquisition nickel sheet integrated fuse structure for pressure acquisition system. BACKGROUND

[0002] Pressure acquisition system is widely used in electric vehicle, energy storage system and other fields, and is an important component of power battery management system, and its performance directly affects the safety and service life of battery. Pressure acquisition system can realize the following functions by real-time monitoring of cell voltage: judging whether battery is in healthy state, detecting battery failure through voltage anomaly and realizing battery pack balancing through monitoring voltage difference.

[0003] In related technology, there are three kinds of acquisition schemes, namely wire harness acquisition scheme, FPC (Flexible Printed Circuit) acquisition scheme and FFC (Flexible Flat Cable) acquisition scheme. Compared with the wire harness acquisition scheme, the FFC acquisition scheme can realize automatic assembly and improve module production efficiency, and compared with the FPC acquisition scheme, the cost of the FFC acquisition scheme is lower, so the FFC acquisition scheme is widely used.

[0004] Currently, there are two kinds of schemes for integrating fuse in FFC acquisition scheme: the first kind is to perform local punching treatment on the conductor in FFC, and set fuse in the conductor. The second kind is to combine FFC with PCB, and then etch or paste fuse on PCB. The inventors found in actual research and development process that when the first kind of scheme is used, FFC conductor is easily damaged during punching treatment of FFC, which greatly reduces the production yield of FFC. When the second kind of scheme is used, since the fuse is far away from the battery end, the fuse has small fuse protection range.

[0005] Therefore, it is necessary to study a new technical scheme to solve the above technical problems. UTILITY MODEL CONTENT

[0006] Therefore, the utility model mainly aims at the defects in the prior art, and provides a pressure acquisition nickel sheet integrated fuse structure for pressure acquisition system, which effectively solves the technical defects of low production yield and small fuse protection range of pressure acquisition system in the prior art.

[0007] To achieve the above purpose, the utility model adopts the following technical scheme: a pressure acquisition nickel sheet integrated fuse structure for pressure acquisition system, comprising pressure acquisition nickel sheet and flexible circuit board stacked on the pressure acquisition nickel sheet.

[0008] The pressure sampling nickel sheet is installed at the electrode end of the battery, the flexible circuit board has a first copper sheet and a second copper sheet, the first copper sheet is used for connecting the pressure sampling system, the second copper sheet is used for connecting the pressure sampling nickel sheet, and a fuse is etched between the first copper sheet and the second copper sheet.

[0009] The pressure sampling nickel sheet integrated fuse structure for the pressure sampling system has the advantages that, compared with the prior art, by arranging the flexible circuit board and etching the fuse between the first copper sheet and the second copper sheet of the flexible circuit board, the problem that the fuse is easily damaged in the prior art can be solved, and the production yield is improved; meanwhile, the flexible circuit board is stacked on the pressure sampling nickel sheet and connected with the pressure sampling nickel sheet, the pressure sampling nickel sheet is installed at the electrode end of the battery, the flexible circuit board can be arranged closer to the electrode end, the current path can be shortened, the current state at the electrode end of the battery can be directly monitored, and the fuse can be quickly melted and cut off, so that the damage of abnormal current to the battery monomer or the entire battery pack can be effectively prevented.

[0010] As a preferred scheme, the flexible circuit board has an insulating base material, and the first copper sheet and the second copper sheet are arranged in the insulating base material and spaced apart front and back.

[0011] As a preferred scheme, the insulating base material has a first avoiding hole penetrating through the upper and lower surfaces thereof, the first avoiding hole is located between the first copper sheet and the second copper sheet, and the fuse is located on the left side or the right side of the first avoiding hole; the pressure sampling nickel sheet is provided with a first mounting hole penetrating through the upper and lower surfaces thereof, and the first mounting hole is coaxially arranged with the first avoiding hole.

[0012] As a preferred scheme, the size of the first avoiding hole is the same as the size of the first mounting hole, or the size of the first avoiding hole is larger than the size of the first mounting hole.

[0013] As a preferred scheme, the first copper sheet is provided with a first connecting leg at the right end of the rear surface thereof, and the second copper sheet is provided with a second connecting leg at the right end of the front surface thereof; one end of the fuse is connected to the first connecting leg, and the other end of the fuse is connected to the second connecting leg.

[0014] As a preferred scheme, the first connecting leg and the second connecting leg are both arranged in a triangular structure, the bottom side of the first connecting leg is integrally formed with the first copper sheet, the bottom side of the second connecting leg is integrally formed with the second copper sheet, and the top point of the first connecting leg and the top point of the second connecting leg are connected to the fuse.

[0015] As a preferred scheme, the insulating base material includes an upper insulating base material and a lower insulating base material, and the first copper sheet and the second copper sheet are arranged between the upper insulating base material and the lower insulating base material; the upper insulating base material is provided with a first welding window penetrating through the upper and lower surfaces thereof, and the first welding window can expose the first copper sheet; and the lower insulating base material is provided with a second welding window penetrating through the upper and lower surfaces thereof, and the second welding window can expose the second copper sheet.

[0016] As a preferred solution: the first welding window and the second welding window are arranged in a rectangular structure, and the first welding window and the second welding window have the same width; the length of the first welding window extends in the front-rear direction, and the length of the second welding window extends in the left-right direction.

[0017] As a preferred solution: the size of the first copper sheet is larger than the size of the second copper sheet.

[0018] As a preferred solution: the pressure collection nickel sheet is provided with a first through hole, the first through hole penetrates the upper and lower surfaces of the pressure collection nickel sheet, and the fuse melt is located above the first through hole. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a perspective structural schematic diagram of the pressure collection nickel sheet integrated fuse structure for the pressure collection system provided by the first embodiment of the present application;

[0021] Figure 2 is Figure 1 is an exploded view of the pressure collection nickel sheet integrated fuse structure for the pressure collection system shown in the first embodiment of the present application;

[0022] Figure 3 is Figure 2 is an exploded view of the flexible circuit board in the pressure collection nickel sheet integrated fuse structure for the pressure collection system shown in the first embodiment of the present application;

[0023] Figure 4 is a partial structural exploded view of the pressure collection nickel sheet integrated fuse structure for the pressure collection system provided by the second embodiment of the present application;

[0024] Figure 5 is Figure 4 is a position relationship diagram of the fuse melt and the first through hole in the pressure collection nickel sheet integrated fuse structure for the pressure collection system shown in the first embodiment of the present application.

[0025] In the drawings, various reference signs represent:

[0026] 10. A pressure extraction nickel sheet integrated fuse structure for a pressure extraction system; 11. A pressure extraction nickel sheet; 111. A first mounting hole; 112. A first through hole; 12. A flexible circuit board; 1201. An upper insulating base material; 1202. A lower insulating base material; 1203. A first solder window; 1204. A second solder window; 1205. A first avoiding hole; 121. A first copper sheet; 1211. A first connecting leg; 122. A second copper sheet; 1221. A second connecting leg; 123. A fuse; 1231. A fuse body. DETAILED DESCRIPTION

[0027] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] In addition, the terms "first", "second", "third", etc. are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0031] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments.

[0032] Please refer to Figures 1 to 5 , the present application will be described. The pressure extraction nickel sheet integrated fuse structure 10 for a pressure extraction system includes a pressure extraction nickel sheet 11 and a flexible circuit board 12.

[0033] The pressure-taking nickel sheet 11 is installed at the electrode end of the battery, the flexible circuit board 12 has a first copper sheet 121 for connecting the pressure-taking system and a second copper sheet 122 for connecting the pressure-taking nickel sheet 11, and a fuse 123 is etched between the first copper sheet 121 and the second copper sheet 122. Compared with the prior art, by arranging the flexible circuit board 12 and etching the fuse 123 between the first copper sheet 121 and the second copper sheet 122 of the flexible circuit board 12, the problem that the conventional technology using FFC punching to arrange the fuse 123 is prone to damage can be solved, thereby improving the production yield. Meanwhile, the flexible circuit board 12 is arranged on the pressure-taking nickel sheet 11 and connected with the pressure-taking nickel sheet 11, the pressure-taking nickel sheet 11 is installed at the electrode end of the battery, the flexible circuit board 12 can be arranged closer to the electrode end, the current path can be shortened, the current state at the battery end can be directly monitored, and the fuse can be quickly melted and cut off, thereby effectively preventing abnormal current from damaging the battery monomer or the entire battery pack.

[0034] First embodiment

[0035] Please refer to Figures 1 to 3 , which is the specific structure of the pressure-taking nickel sheet integrated fuse structure for the pressure-taking system provided in the first embodiment of the present application.

[0036] In the first embodiment of the present application, the flexible circuit board 12 has an insulating substrate, the first copper sheet 121 and the second copper sheet 122 are arranged in the insulating substrate and have a front-to-back spacing. The insulating substrate has a first avoiding hole 1205 penetrating through the upper and lower surfaces thereof, the first avoiding hole 1205 is located between the first copper sheet 121 and the second copper sheet 122, and the fuse 123 is located on the left side or the right side of the first avoiding hole 1205; the pressure-taking nickel sheet 11 is provided with a first mounting hole 111 penetrating through the upper and lower surfaces thereof, and the first mounting hole 111 is coaxially arranged with the first avoiding hole 1205.

[0037] During installation, the pressure-taking nickel sheet 11 and the electrode end of the battery are directly connected in conduction by screwing a fastener such as a screw through the first avoiding hole 1205 and the first mounting hole 111 into the electrode end screw hole of the battery. In this structure, first, when the fuse 123 close to the electrode end detects abnormal current (such as short circuit or overload), it can be quickly melted and cut off the circuit. This rapid response can effectively prevent abnormal current from damaging the battery monomer or the entire battery pack.

[0038] Second, the fuse 123 close to the electrode end can shorten the current path and reduce the time and distance of abnormal current staying in the circuit. This helps to reduce the risk of energy accumulation caused by short circuit or overload, thereby reducing the risk of thermal runaway.

[0039] In a third aspect, the fuse 123 close to the electrode end can directly monitor the current state of the battery end, avoiding protection failure caused by line failure or poor contact. This design can ensure reliable protection at the link closest to the battery.

[0040] In a fourth aspect, when the fuse 123 is fused, the close-to-electrode-end design can reduce the risk of arc generation and prevent secondary short circuit caused by fuse debris or molten metal after fusion.

[0041] In a fifth aspect, placing the fuse 123 close to the electrode end can reduce the complexity of the protection circuit, while ensuring direct interruption of fault current at the battery end, avoiding unnecessary impact on other circuit components.

[0042] It can be understood that the first avoidance through hole is also connected by welding, using tin liquid to fill the first avoidance through hole and fixedly connecting with the electrode end of the battery.

[0043] Specifically, the size of the first avoidance hole 1205 is the same as the size of the first mounting hole 111, or the size of the first avoidance hole 1205 is greater than the size of the first mounting hole 111. With such a structure, it can be ensured that when the pressure-collecting nickel sheet 11 is fixedly connected with the electrode end of the battery, the structure of the flexible circuit board 12 will not be damaged, thereby improving the reliability and assembly yield during assembly work.

[0044] In the first embodiment of the present application, the first copper sheet 121 has a first connecting leg 1211 at the right end of the rear surface, and the second copper sheet 122 has a second connecting leg 1221 at the right end of the front surface; one end of the fuse 123 is connected to the first connecting leg 1211, and the other end is connected to the second connecting leg 1221. The first connecting leg 1211 and the second connecting leg 1221 are both triangular in structure, the bottom edge of the first connecting leg 1211 is integrally formed with the first copper sheet 121, the bottom edge of the second connecting leg 1221 is integrally formed with the second copper sheet 122, and the top points of the first connecting leg 1211 and the second connecting leg 1221 are connected to the fuse 123.

[0045] Specifically, the insulating base material includes an upper insulating base material 1201 and a lower insulating base material 1202, and the first copper sheet 121 and the second copper sheet 122 are arranged between the upper insulating base material 1201 and the lower insulating base material 1202; the upper insulating base material 1201 is provided with a first welding window 1203 penetrating through its upper and lower surfaces, and the first welding window 1203 can expose the first copper sheet 121; the lower insulating base material 1202 is provided with a second welding window 1204 penetrating through its upper and lower surfaces, and the second welding window 1204 can expose the second copper sheet 122.

[0046] When welding, the lower insulating base material 1202 is pasted on the upper surface of the pressure sampling nickel sheet 11, and the second copper sheet 122 is welded and fixed together with the pressure sampling nickel sheet 11 through reflow soldering; then the flexible flat cable or FPC flexible circuit board 12 or the ordinary cable is welded and fixed together with the first copper sheet 121, so that the first copper sheet 121 is connected with the battery management system.

[0047] More specifically, the first welding window 1203 and the second welding window 1204 are arranged in a rectangular structure, and the widths of the first welding window 1203 and the second welding window 1204 are the same; the length of the first welding window 1203 extends in the front-rear direction, and the length of the second welding window 1204 extends in the left-right direction.

[0048] In the first embodiment of the present application, the thickness of the pressure sampling nickel sheet 11 is the same as the thickness of the flexible circuit board 12. The size of the first copper sheet 121 is larger than the size of the second copper sheet 122. With such a structure, the design of the large pad can increase the welding area, improve the welding strength, and reduce the risk of disconnection caused by welding stress; in addition, the large pad can better conduct heat, ensuring uniform heat distribution during welding and avoiding welding defects caused by local overheating or poor heat dissipation.

[0049] Second embodiment

[0050] Please refer to Figures 4 to 5 The specific structure of the pressure sampling nickel sheet integrated fuse structure for the pressure sampling system provided in the second embodiment of the present application is substantially the same as the specific structure provided in the first embodiment of the present application, except that the pressure sampling nickel sheet 11.

[0051] In some other embodiments of the present application, the pressure sampling nickel sheet 11 is provided with a first through hole 112, which penetrates the upper and lower surfaces of the pressure sampling nickel sheet 11, and the fuse body 1231 of the fuse 123 is located above the first through hole 112. By providing the first through hole 112, heat dissipation of the pressure sampling nickel sheet and the fuse can be facilitated, avoiding false melting of the fuse due to overheating, and improving the reliability and accuracy of the melting of the fuse body.

[0052] The above is only a preferred embodiment of the present application, and only the technical principle of the present application is specifically described. These descriptions are only for explaining the principle of the present application, and cannot be interpreted as limiting the protection scope of the present application in any way. Based on the explanations herein, any modification, equivalent replacement and improvement made within the spirit and principles of the present application, and other specific embodiments of the present application that can be conceived by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. A pressure harvesting nickel strip integrated fuse structure for a pressure harvesting system, characterized by: The pressure sampling nickel sheet (11) and the flexible circuit board (12) are stacked on the pressure sampling nickel sheet (11); The pressure sampling nickel sheet (11) is installed on the electrode end of the battery, the flexible circuit board (12) has a first copper sheet (121) and a second copper sheet (122), the first copper sheet (121) is used for connecting the pressure sampling system, the second copper sheet (122) is used for connecting the pressure sampling nickel sheet (11), and a fuse (123) is etched between the first copper sheet (121) and the second copper sheet (122).

2. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system according to claim 1, characterized in that: The flexible circuit board (12) has an insulating base material, the first copper sheet (121) and the second copper sheet (122) are arranged in the insulating base material and are arranged with a front-rear spacing.

3. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system according to claim 1 or 2, characterized in that: The insulating base material has a first avoiding hole (1205) penetrating through the upper and lower surfaces thereof, the first avoiding hole (1205) is located between the first copper sheet (121) and the second copper sheet (122), and the fuse (123) is located on the left side or the right side of the first avoiding hole (1205); The pressure sampling nickel sheet (11) is provided with a first mounting hole (111) penetrating through the upper and lower surfaces thereof, and the first mounting hole (111) is coaxially arranged with the first avoiding hole (1205).

4. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system of claim 3, wherein: The size of the first avoiding hole (1205) is the same as the size of the first mounting hole (111); or, The size of the first avoiding hole (1205) is greater than the size of the first mounting hole (111).

5. The pressure tapping nickel strip fuse integrated fuse structure for pressure tapping system according to claim 1 or 2 or 4, characterized in that: The first copper sheet (121) is provided with a first connecting leg (1211) at the right end of the rear surface thereof, and the second copper sheet (122) is provided with a second connecting leg (1221) at the right end of the front surface thereof; one end of the fuse (123) is connected to the first connecting leg (1211), and the other end is connected to the second connecting leg (1221).

6. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system of claim 5, wherein: The first connecting leg (1211) and the second connecting leg (1221) are both arranged in a triangular structure, the bottom edge of the first connecting leg (1211) is integrally formed with the first copper sheet (121), the bottom edge of the second connecting leg (1221) is integrally formed with the second copper sheet (122), and the top point of the first connecting leg (1211) and the second connecting leg (1221) is connected to the fuse.

7. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system according to claim 2 or 4 or 6, characterized in that: The insulating base material includes an upper insulating base material (1201) and a lower insulating base material (1202), and the first copper sheet (121) and the second copper sheet (122) are arranged between the upper insulating base material (1201) and the lower insulating base material (1202); The upper insulating base material (1201) is provided with a first welding window (1203) penetrating through the upper and lower surfaces thereof, and the first welding window (1203) can expose the first copper sheet (121); the lower insulating base material (1202) is provided with a second welding window (1204) penetrating through the upper and lower surfaces thereof, and the second welding window (1204) can expose the second copper sheet (122).

8. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system of claim 7, wherein: The first welding window (1203) and the second welding window (1204) are arranged in a rectangular structure, and the widths of the first welding window (1203) and the second welding window (1204) are the same; The length of the first welding window (1203) extends in the front-rear direction, and the length of the second welding window (1204) extends in the left-right direction.

9. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system of claim 1 or 2 or 4 or 6 or 8, wherein: The size of the first copper sheet (121) is greater than the size of the second copper sheet (122).

10. The pressure tapping nickel strip fuse integrated fuse structure for a pressure tapping system of claim 1 or 2 or 4 or 6 or 8, wherein: The pressure tapping nickel sheet (11) is provided with a first through hole (112) penetrating the upper and lower surfaces of the pressure tapping nickel sheet (11), and the fuse (123) is arranged above the first through hole (112).

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