A non-isolated NTC assembly
By directly soldering surface-mount NTCs to PCBs or FPCBs in non-isolated NTC components and utilizing a mechanical connection method involving nickel sheet folding and reflow soldering, the problem of easy soldering cracking is solved, resulting in a smaller and more reliable connection, reduced costs, and improved temperature measurement accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINGQIN YICHANG ELECTRONICS
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-07
AI Technical Summary
Existing non-isolated NTC components are prone to cracking when soldered on PCBs or FPCBs, and traditional connection methods result in large product size, poor connection reliability, and high cost.
The surface-mount NTC is directly soldered to the PCB or FPCB board, and mechanical connection is achieved through openings in the PCB board and nickel strip folding parts. Combined with reflow soldering and low thermal conductivity conformal coating, a reliable connection is achieved.
It achieves a smaller and more reliable connection, reduces costs, and improves temperature conduction speed and measurement accuracy, making it suitable for signal acquisition in energy storage or power battery modules.
Smart Images
Figure CN224472488U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of temperature sensors, and in particular to a non-isolated NTC component. Background Technology
[0002] CN202322197703 - A lithium battery voltage and temperature acquisition board, in which the temperature sensor is connected to the PCB substrate via an FPC cable. This structure results in a large product size and poor connectivity. Using a traditional wire harness-type NTC results in a complex structure with numerous leads, low integration, large size, and relatively high cost.
[0003] The current non-isolated NTC (NTC and voltage sampling point share a common ground / collinearity) design, where one terminal of the NTC resistor is electrically connected to the nickel plate, allows for simultaneous acquisition of battery pack temperature and voltage signals with just two leads. Traditional isolated NTCs require at least three leads to acquire these signals. Compared to traditional isolated NTCs, this design saves on wiring harness costs, simplifies the structure, and improves assembly efficiency.
[0004] However, the nickel sheets of existing non-isolated NTCs are usually directly soldered onto PCBs or FPCBs, which has the drawback of being prone to cracking. Summary of the Invention
[0005] The technical problem to be solved by this utility model is to provide a non-isolated NTC component that not only meets customer needs for thinness, fast temperature conduction and low cost, but also provides more reliable connection.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0007] A non-isolated NTC component includes a surface mount NTC, which is directly surface-mounted and soldered to a PCB board or an FPCB board; a nickel strip is provided on one side of the PCB board or FPCB board of the surface mount NTC, and the nickel strip is mechanically bonded and soldered to the PCB board or FPCB board.
[0008] The PCB board has an insertion hole, and one end of the corresponding nickel sheet has a folding part, which passes through the insertion hole and is folded.
[0009] The folding section consists of two or three groups, with one group folding to one side and the other group or two groups folding to the other side.
[0010] When the surface mount NTC on the PCB is located on the front side, the corresponding nickel strip is also located on the front side; or, when the surface mount NTC on the PCB is located on the front side, the corresponding nickel strip is located on the back side.
[0011] The PCB board has openings on both sides.
[0012] A slot is provided between the two openings.
[0013] The nickel sheet on the FPCB board includes a nickel sheet body, with a clamping part punched upward at the middle section of the nickel sheet body. The clamping part and the nickel sheet body clamp and support the FPCB board.
[0014] The surface of the patch-type NTC is coated with a low thermal conductivity conformal adhesive.
[0015] This utility model provides a non-isolated NTC component, which has the following technical advantages:
[0016] 1) Traditional NTC components are connected to PCBs or FPCBs via wire harnesses, which takes up space, has poor connection reliability, and poor sealing. This application first drills holes in the PCB and makes mechanical connections with nickel strip clips. Then, surface mount technology is used to surface mount and solder the NTC components to the PCB or FPCB, and to solder the PCB or FPCB to the nickel strip. This not only saves space, but also makes the connection between the nickel strip and the PCB or FPCB more reliable.
[0017] 2) This design uses a 0.15mm thick nickel sheet paired with a 0.8mm PCB board, and adds multiple sets of metallized through-holes to achieve rapid temperature conduction. The NTC surface is coated with a low thermal conductivity conformal coating to reduce surface heat loss and improve temperature measurement accuracy. Automated surface mount technology (SMT) production is employed, resulting in high production efficiency and low cost.
[0018] 4) By welding the nickel sheet to the PCB board or FPCB board, the nickel sheet can be laser welded to the aluminum plate of the customer's battery pack. The NTC and lead wires can be welded to the PCB board. The FPCB is a flexible circuit board with a nickel sheet welded to one end. The nickel sheet is laser welded to the aluminum plate of the customer's battery pack. The other end of the FPCB can be directly welded to the customer's main PFC circuit.
[0019] 5) CN201620240719 - A power battery module signal acquisition structure, the device indicates that: a temperature sensor is attached to the PCB substrate and connected to a first nickel plate and a second nickel plate, the first nickel plate and the second nickel plate which are smaller than the first nickel plate are used to acquire temperature and voltage.
[0020] The differences and advantages of this application compared to the prior art are:
[0021] This application presents a design that is more compact and has a wider range of applications than the prior art, replacing traditional wire harness-type NTC products. It also offers lower costs compared to traditional wire harness-type NTCs and can be widely used for signal acquisition in energy storage or power battery modules. In this design, the nickel sheet can be directly laser-welded to the aluminum plate on the client's battery pack. Attached Figure Description
[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0023] Figure 1 This is a front structural diagram of the present invention (first type).
[0024] Figure 2 This is a schematic diagram of the rear structure of the present invention (first type).
[0025] Figure 3 This is a cross-sectional view of the present invention (first type).
[0026] Figure 4 This is a diagram illustrating the welding area of this utility model (first type).
[0027] Figure 5 This is a front structural diagram of the present invention (second type).
[0028] Figure 6 This is a schematic diagram of the rear structure of the present invention (second type).
[0029] Figure 7 This is a cross-sectional view of the present invention (second type).
[0030] Figure 8 This is a second illustration of the welding area of this utility model.
[0031] Figure 9 This is a front structural diagram of the present invention (third type).
[0032] Figure 10 This is a schematic diagram of the structure of the FPCB board in this utility model (third type).
[0033] Figure 11 This is a cross-sectional view of the present invention (third type).
[0034] Figure 12 This is a second illustration of the welding area of this utility model.
[0035] In the diagram: PCB board 1, surface mount NTC 2, nickel sheet 3, opening 4, slot 5, folding part 6, insertion hole 7, copper foil layer 8, tin plating area 9, FPCB board 10, nickel sheet body 3.1, clamping part 3.2. Detailed Implementation
[0036] Example 1
[0037] like Figure 1-3As shown, a non-isolated NTC component includes a PCB board 1, which is directly soldered to a surface-mount NTC 2 using SMT (Surface Mount Technology) soldering. The surface-mount NTC 2 is a 0603 packaged NTC capable of sensing temperature signals. The advantages of direct soldering are low cost, mature automated processing technology, and small product size.
[0038] On one side of the surface mount NTC2, the PCB board 1 has openings 4 on the left and right, and a copper foil layer 8 is provided on the PCB board 1 around the two openings 4. The two openings 4 are used for wire insertion and soldering to achieve conductivity. A slot 5 is provided between the two openings 4, which increases the creep distance between the two electrodes and reduces the risk of metal migration. On the other side of the surface mount NTC2, the PCB board 1 has a socket 7. The upper surface of the PCB board 1 on the side away from the surface mount NTC2 also has a copper foil layer 8. A nickel sheet 3 is attached to the upper surface of the PCB board 1, and one end of the nickel sheet 3 has a folded part 6. The folded part 6 passes through the socket 7 and is folded to attach to the lower surface of the PCB board 1.
[0039] Preferably, the insertion holes 7 are distributed in a left-center-right pattern, and the folding parts 6 are provided in three sets accordingly. One set of folding parts 6 passes through the insertion holes 7 and flips to one side, while the other two sets of folding parts 6 pass through the insertion holes 7 and flip to the other side. The advantage of this left-right folding rather than folding to one side is that the mechanical fixation is more secure, and the nickel sheet will not move left or right.
[0040] like Figure 4 As shown, during installation, the nickel plate 3 is inserted from above the PCB board 1. The folded-down portion 6 of one end of the nickel plate 3 passes through the insertion hole 7 of the PCB board 1 and is then mechanically engaged by twisting it 45 degrees to the left and right with pliers. The advantage of this mechanical engagement is that the nickel plate will not move left or right. Compared to pure soldering, mechanical fixing is more reliable.
[0041] The copper foil layer 8 area on the right side of the upper surface of PCB board 1 is the soldering area of nickel sheet 3. The surface mount NTC 2 is soldered to PCB board 1 by reflow soldering, and PCB board 1 and nickel sheet 3 are connected by reflow soldering and mechanical bonding.
[0042] The surface of the surface-mount NTC2 is coated with low thermal conductivity conformal adhesive. Figure 4 The circle at the NTC2 in the middle is the low thermal conductivity conformal coating area, which is used for moisture protection; the copper foil layer 8 area at the two openings 4 on the left side of PCB1 is the soldering area for the conductors.
[0043] The wires are soldered after passing through the two openings 4 on the left side from below the PCB board 1. The slot 5 between the two openings 4 on the PCB board 1 can increase the creep distance between the two electrodes and reduce the risk of metal migration.
[0044] Example 2
[0045] like Figure 5-7As shown, a non-isolated NTC assembly includes a PCB board 1, with a surface-mount NTC 2 soldered to the upper surface of the PCB board 1. The PCB board 1 on one side of the surface-mount NTC 2 has openings 4 on the left and right sides, with a slot 5 between the two openings 4. Copper foil layers 8 are provided on the upper and lower surfaces of the PCB board 1 surrounding the two openings 4, and the two openings 4 are used for wire insertion and soldering. The PCB board 1 on the other side of the surface-mount NTC 2 has insertion holes 7 on the left and right sides. A copper foil layer 8 is also provided on the lower surface of the PCB board 1 on the side of the insertion holes 7 away from the surface-mount NTC 2. A nickel sheet 3 is attached to the lower surface of the PCB board 1, and one end of the nickel sheet 3 has a folded portion 6. The folded portion 6 passes through the insertion hole 7 and, after being flipped, is attached to the upper surface of the PCB board 1.
[0046] Preferably, the folding part 6 is provided in two sets, one set of folding parts 6 passes through the insertion hole 7 and flips to one side, and the other set of folding parts 6 passes through the insertion hole 7 and flips to the other side.
[0047] like Figure 8 As shown in the figure, a represents PCB 1 on the front (top surface), and b represents PCB 1 on the back (bottom surface). The multiple sets of small round holes on PCB 1 represent metallized through-holes, which can connect the upper and lower layers of the PCB and increase thermal conductivity. This allows for electrical connection between the upper and lower layer circuits of the PCB, and further connects to the nickel strip to achieve non-isolated NTC functionality. Figure 4 There are also metallized through holes, but they are not shown.
[0048] During installation, the nickel sheet 3 is inserted from below the PCB board 1. The folded parts 6 of the nickel sheet 3 on both sides are passed through the insertion holes 7 of the PCB board 1 and then mechanically connected by twisting them 45 degrees to the left and right with pliers. The right side of the lower end face of the PCB board 1 is the soldering area of the nickel sheet 3. The surface mount NTC 2 is soldered to the PCB board 1 by reflow soldering, and the PCB board 1 and the nickel sheet 3 are connected by reflow soldering and mechanical connection.
[0049] The surface-mount NTC2 is coated with low thermal conductivity conformal adhesive for moisture protection; the wires are soldered after passing through the two openings 4 on the left; the slot 5 between the two holes on the PCB board 1 increases the creep distance between the two electrodes and reduces the risk of metal migration.
[0050] Example 3
[0051] like Figure 9-11 As shown, a non-isolated NTC assembly includes an FPCB board 10, with a surface-mount NTC 2 soldered to the upper surface of the FPCB board 10. Slots 5 are provided on the left and right sides of the FPCB board 10 on one side of the surface-mount NTC 2. The purpose of the slots 5 is to increase the creepage distance between the two electrodes and reduce the risk of metal migration. Copper foil layers 8 are provided on the upper and lower surfaces of the FPCB board 10 on both sides of the slots 5. The copper foil layers 8 are used for reflow soldering between the FPCB board 10 and the nickel sheet 3.2.
[0052] The FPCB board 10 on the other side of the surface mount NTC2 also has a copper foil layer 8. The nickel sheet 3 includes a nickel sheet body 3.1, and a clamping part 3.2 is punched upward from the nickel sheet body 3.1. The advantage of setting the clamping part 3.2 is that since the FPCB board 10 is relatively soft, it is similar to mechanically fixing the FPC board, which makes the positioning more accurate and the welding strength higher.
[0053] The clamping part 3.2 is kept horizontal and is located on the upper end face of the FPCB board 10. The nickel sheet body 3.1 is located on the lower end face of the FPCB board 10. The clamping part 3.2 and the nickel sheet body 3.1 clamp the FPCB board 10.
[0054] like Figure 12 As shown in the figure, a indicates that the FPCB board 10 is on the front (top surface), and b indicates that the FPCB board 10 is on the back (bottom surface). The nickel sheet 3 is sandwiched into the FPCB board 10 from the right side. The upper and lower blocks on the right side of the FPCB board 10 are the soldering areas of the nickel sheet 3. The surface mount NTC2 is soldered to the FPCB board 10 by reflow soldering, and the FPCB board 10 and the nickel sheet 3 are connected by reflow soldering and mechanical bonding.
[0055] Nickel sheet 3 provides structural support below the surface-mount NTC2. Nickel sheet 3 mainly provides support and enhances heat conduction, resulting in more accurate temperature measurement.
[0056] The surface-mount NTC2 is coated with low thermal conductivity conformal adhesive for moisture protection; multiple solder joints (copper foil layer 8) are set on the left side, and the connection method between the two FPBC boards 10 is determined by the customer.
Claims
1. A non-isolated NTC component, characterized in that: Includes a surface mount NTC (2), which is directly surface mount soldered to a PCB board (1) or an FPCB board (10); a nickel sheet (3) is provided on one side of the PCB board (1) or FPCB board (10), and the nickel sheet (3) is mechanically bonded and soldered to the PCB board (1) or FPCB board (10).
2. A non-isolated NTC component according to claim 1, characterized in that: The PCB board (1) has a socket (7) and a folding part (6) is provided at one end of the corresponding nickel sheet (3). The folding part (6) passes through the socket (7) and is folded.
3. A non-isolated NTC component according to claim 2, characterized in that: The folding part (6) is in two or three groups, one of which folds to one side and the other or two groups fold to the other side.
4. A non-isolated NTC component according to claim 3, characterized in that: When the surface mount NTC (2) on the PCB board (1) is on the front side, the corresponding nickel sheet (3) is on the front side; or, when the surface mount NTC (2) on the PCB board (1) is on the front side, the corresponding nickel sheet (3) is on the back side.
5. A non-isolated NTC component according to claim 4, characterized in that: The PCB board (1) has openings (4) on the left and right sides.
6. A non-isolated NTC component according to claim 5, characterized in that: A slot (5) is provided between the two openings (4).
7. A non-isolated NTC component according to claim 6, characterized in that: The nickel sheet (3) on the FPCB board (10) includes a nickel sheet body (3.1), and a clamping part (3.2) is punched upward at the middle section of the nickel sheet body (3.1). The clamping part (3.2) and the nickel sheet body (3.1) clamp and support the FPCB board (10).
8. A non-isolated NTC component according to claim 7, characterized in that: The surface of the patch-type NTC (2) is coated with low thermal conductivity conformal adhesive.