Flexible circuit board assembly of battery CCS assembly for information acquisition

Abstract

The invention provides a flexible circuit board assembly of a battery CCS assembly for information acquisition, and belongs to the technical field of flexible circuit board production. The flexible circuit board assembly comprises an FPC body, the FPC body is provided with a plurality of temperature acquisition areas and a plurality of voltage acquisition areas, each temperature acquisition area of the FPC body is connected with a corresponding NTC branch FPC in a laser welding mode, and a bonding pad of each voltage acquisition area of the FPC body is connected with a corresponding voltage busbar in the CCS assembly in a laser welding mode; the output end of the FPC body is connected with the connector branch FPC in a laser welding mode. Conductor materials of the voltage busbar, the FPC body, the connector branch FPC and the NTC branch FPC are all aluminum materials. Through innovative material selection and welding process optimization, the production cost is greatly reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible circuit board production, in particular to a flexible circuit board component of a battery CCS assembly for information collection. Background Art

[0002] With the rapid development of new energy batteries in electric vehicles, energy storage systems and other fields, higher requirements are placed on the information collection unit in the battery management system (BMS), especially in the accurate collection of voltage and temperature. Traditional new energy battery CCS modules generally use copper-based flexible circuit boards (FPCA) as conductor materials, but the existing technology has significant limitations in many aspects:

[0003] 1. High material costs: With the gradual reduction of global copper resources and the continuous rise in copper prices, the cost advantage of copper metal in electronic manufacturing has gradually been lost. With the vigorous development of the new energy battery industry, the demand for materials has continued to increase. The price volatility and supply instability of copper have become a significant problem in production.

[0004] 2. Weight problem: The high density of copper-based materials makes the entire system heavier, which is obviously not conducive to the application of new energy batteries.

[0005] 3. Connection reliability issues: In traditional solutions, the connection between the battery bus and the circuit board uses a nickel sheet adapter. Although voltage acquisition can be completed, the cost is relatively high. The nickel sheet connector may have certain reliability risks, especially in long-term use and vibration environments, which will lead to unstable connections and affect the overall safety and reliability of the system.

[0006] 4. Complex process and lengthy process: For large-size flexible circuit boards, multiple steps are required during welding and manufacturing. The entire process is complex and time-consuming. With the increase of process steps, the production cycle and operation difficulty are greatly increased, resulting in reduced production efficiency.

[0007] Therefore, a new solution is urgently needed to replace the traditional copper-based circuit boards, reduce costs, simplify processes, improve system reliability, and achieve lightweight design. Summary of the invention

[0008] The purpose of the present invention is to address the above-mentioned problems in the prior art and to propose a flexible circuit board component of a battery CCS assembly for information collection.

[0009] The object of the present invention can be achieved by the following technical solutions: A flexible circuit board assembly of a battery CCS assembly for information collection, comprising an FPC body, the FPC body is provided with a plurality of temperature collection areas and a plurality of voltage collection areas, each temperature collection area of ​​the FPC body is connected to a corresponding NTC branch FPC by laser welding, and a pad of each voltage collection area of ​​the FPC body is connected to a corresponding voltage bus in the CCS assembly by laser welding; the output end of the FPC body is connected to a connector branch FPC by laser welding;

[0010] The conductor materials of the voltage bus, the FPC body, the connector branch FPC and the NTC branch FPC are all made of aluminum.

[0011] Preferably, when the connector branch FPC is connected to the external connector, the external connector is connected to the connector branch FPC by SMT patch soldering.

[0012] Preferably, when the NTC branch FPC is connected to the NTC component, the NTC component is connected to the NTC branch FPC by SMT soldering.

[0013] Preferably, before welding, the aluminum surface of the connector branch FPC to be welded area is treated with chemical nickel-gold.

[0014] Preferably, before welding, the aluminum surface of the NTC branch FPC to be welded is treated with chemical nickel-gold.

[0015] Preferably, the specific types of conductor materials of the FPC body, the connector branch FPC and the NTC branch FPC are all aluminum 1100.

[0016] Preferably, in the CCS assembly, a PC blister tray is selected as the bearing component.

[0017] Preferably, the voltage bus is fixed on the PC blister plate by a hot riveting process.

[0018] Preferably, the pads in the voltage collection area of ​​the FPC body are designed with double openings.

[0019] Preferably, the voltage busbar in the CCS assembly is specifically an aluminum busbar.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Reduce material costs: The present invention uses aluminum metal as the conductor material of the flexible circuit board assembly, replacing the traditional copper metal. The cost of aluminum metal is much lower than that of copper metal, and it has a more abundant reserve, which greatly reduces the production cost of the entire battery information collection system. Especially in large-scale production, the material cost advantage of aluminum metal is more prominent, which helps to reduce the cost of the overall system and enhance the market competitiveness of the product.

[0022] 2. Reduce product weight: The density of aluminum metal is much lower than that of copper metal. Using aluminum metal as the conductor material of the circuit board can significantly reduce the weight of the final product. This is of great significance for applications that require lightweight, such as new energy battery systems, and helps to improve the energy efficiency of the battery system and extend the battery life.

[0023] 3. Improve welding reliability: The aluminum-based flexible circuit board designed in the present invention is consistent with the bus material (both are aluminum), which makes the welding process simpler and more reliable, can ensure the reliability of the battery information collection system during long-term operation, and reduce failures and losses caused by poor welding.

[0024] 4. Simplify the production process and improve production efficiency: For large-size circuit boards, compared with copper materials, the present invention simplifies the production process by eliminating the traditional SMT soldering process and replacing it with a single-machine laser welding process. The laser welding process not only reduces the steps and links, but also reduces the equipment investment and the need for manual operation. It reduces the process cycle and material waste, and achieves a more efficient production process.

[0025] 5. Reduce costs: Compared with the traditional use of copper materials, which requires nickel sheet connectors, the present invention avoids the use of additional connectors or complex welding processes by directly connecting the voltage bus to the pads in the voltage collection area of ​​the circuit board, simplifies the materials and process flow, and significantly reduces production costs.

[0026] 6. Improve product sustainability and environmental friendliness: Since aluminum is one of the most abundant metals on earth, its mining and production process is relatively environmentally friendly and resource-sustainable. Compared with copper, the use of aluminum helps reduce dependence on scarce resources and meets the current requirements of green environmental protection and sustainable development. Especially when new energy battery systems are used on a large scale, the promotion of aluminum-based flexible circuit boards will help achieve a more green and environmentally friendly production method.

[0027] In short, the present invention not only greatly reduces production costs and improves production efficiency through innovative material selection and welding process optimization, but also enhances product reliability and market competitiveness. These beneficial effects not only meet the needs of the new energy industry for high-efficiency, low-cost, and sustainable products, but also provide a new direction for the technical development of the flexible circuit board field. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the flexible circuit board component of the battery CCS assembly of the present invention.

[0029] Figure 2 For the present invention Figure 1 A partial enlarged view of .

[0030] In the figure, 1 is the output end of the FPC body; 2 is the connector branch FPC; 3 is the NTC branch FPC; 4 is the PC blister tray; 5 is the temperature collection area; 6 is the voltage collection area; 7 is the FPC body; 8 is the thermal pad; 9 is the injection molding bracket. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Specific embodiment:

[0033] like Figure 1 As shown, a flexible circuit board component of a battery CCS assembly for information collection includes an FPC body 7, and the FPC body 7 is provided with a plurality of temperature collection areas 5 and a plurality of voltage collection areas 6, such as Figure 2 As shown, each temperature collection area 5 of the FPC body 7 is connected to the corresponding NTC branch FPC3 by laser welding, and the pad of each voltage collection area 6 of the FPC body 7 is connected to the corresponding voltage bus in the CCS assembly by laser welding; when the NTC branch FPC3 is connected to the NTC element, the NTC element is connected to the NTC branch FPC3 by SMT soldering. The NTC branch FPC3 and the NTC element constitute an external temperature collection unit, which is fixed on the PC blister plate through a thermal pad 8 and an injection molding bracket 9.

[0034] The output terminal 1 of the FPC body is connected to the connector branch FPC2 by laser welding;

[0035] The conductor materials of the voltage busbar, the FPC body 7, the connector branch FPC2 and the NTC branch FPC3 are all made of aluminum.

[0036] When the connector branch FPC2 is connected to the external connector, the external connector is connected to the connector branch FPC2 by SMT patch soldering.

[0037] Before welding, the aluminum surface of the connector branch FPC2 to be welded area is treated with chemical nickel gold.

[0038] Before welding, the aluminum surface of the NTC branch FPC3 to be welded is treated with chemical nickel-gold.

[0039] The specific types of conductor materials of the FPC body 7 , the connector branch FPC2 , and the NTC branch FPC3 are all aluminum 1100.

[0040] In the CCS assembly, the PC blister tray 4 is selected as the bearing component.

[0041] The voltage bus is fixed on the PC blister plate 4 by a hot riveting fixing process.

[0042] The pads of the voltage collection area 6 of the FPC body 7 are designed with double openings.

[0043] The conductor material of the voltage busbar in the CCS assembly is specifically 1060 type aluminum material.

[0044] As a load-bearing component, the PC (polycarbonate) blister tray has excellent mechanical strength, heat resistance and easy processing, and can provide stable support for the battery monitoring system. Benefits: The PC blister tray is not only low-cost, but also light and strong. It can effectively protect electronic components and ensure the stability and service life of the equipment. The hot riveting fixing process is an efficient and stable fixing method that can ensure the firmness of the component while keeping the material intact. Benefits: The hot riveting fixing method avoids the use of traditional hardware such as bolts and nails, reduces the size and weight of the equipment, improves assembly efficiency, and enhances the stability of the fixed connection.

[0045] The pads in the voltage collection area of ​​the FPC body are designed with double openings: the two openings can provide more welding points, thereby improving the reliability of the welding connection.

[0046] Chemical nickel-gold treatment on aluminum surface: Chemical nickel-gold treatment on aluminum surface can provide stronger oxidation resistance and good welding performance, and reduce poor welding during welding. Benefits: Chemical nickel-gold treatment improves the conductivity and stability of the welding area, increases the reliability and durability of electrical connections, and reduces poor contact caused by oxidation.

[0047] The connector branch FPC is connected to the external connector through SMT soldering: SMT (surface mount technology) is a precise and efficient welding method. Benefits: SMT soldering technology can provide efficient and reliable connections, reduce welding errors, increase assembly speed, and ensure the stability and long-term reliability of the overall system performance.

[0048] The NTC branch FPC and NTC components are connected by SMT soldering: The SMT soldering technology is also used to connect the NTC components to ensure the stability and accuracy of the temperature sensor. The NTC component is responsible for monitoring the battery temperature, and soldering can effectively prevent poor contact. Benefits: Through SMT soldering, the installation of the NTC component can be ensured to be stable, and the risk of poor contact can be reduced, thereby improving the accuracy and reliability of temperature acquisition.

[0049] There are several reasons for choosing aluminum 1100 as the conductor material for the FPC body, connector branch FPC and NTC branch FPC: 1. Superior conductivity of high-purity aluminum: Aluminum 1100 is a pure aluminum material, and its aluminum content usually reaches more than 99%, which makes it have very good conductivity. Compared with other alloy aluminum materials, aluminum 1100 has lower resistance and can effectively conduct current, meeting the demand for conductivity in flexible circuit board components. Therefore, the selection of aluminum 1100 helps to ensure the stability of the electrical performance of the entire battery information acquisition system and improve its reliability. 2. Good processability and weldability: Aluminum 1100 has excellent processability and weldability. It has a low content of alloy elements, making the material easier to machine, bend and form. In addition, aluminum 1100 has high chemical stability and can provide better connectivity during welding. In the implementation of the present invention, laser welding and SMT welding technology are used, and aluminum 1100 as a conductor material can ensure good welding contact, reduce failures and losses caused by poor welding, and thus improve the reliability of the entire system. 3. Advantages of lightweight: The density of aluminum is much lower than that of copper (about 1 / 3 of copper), so the use of aluminum 1100 can significantly reduce the weight of flexible circuit board components. In application scenarios that require lightweight, especially in new energy battery systems, reducing product weight helps to improve the energy efficiency ratio of the battery and extend the battery life. Using aluminum 1100 as a conductor material can effectively reduce the overall weight of the system and meet the requirements of modern electronic equipment for lightweight design. 4. Material cost advantage: Compared with other metal materials such as copper, the price of aluminum 1100 is more economical and has obvious cost advantages. In large-scale production, the procurement cost and processing cost of aluminum are low, which can effectively reduce the overall production cost. Especially in large-scale new energy battery systems, choosing aluminum 1100 as a conductor material can help reduce material and manufacturing costs and enhance the market competitiveness of products. 5. Environmental protection and sustainability: As a common metal, aluminum has high recyclability and resource abundance. In particular, aluminum 1100, due to its high purity, is usually derived from recycled aluminum or ore aluminum. The mining and production process is relatively environmentally friendly and meets the needs of sustainable development. Compared with rare copper, the use of aluminum 1100 can reduce dependence on scarce resources and promote environmental protection. 6. Compatibility of welding pretreatment and chemical nickel-gold treatment: Before welding, the surface of aluminum 1100 can be treated with chemical nickel-gold (chemical nickel plating and metal gold plating) to improve the stability and reliability of the welding area. This treatment method can maintain the lightness and corrosion resistance of aluminum while improving the connection strength and stability with other metal materials, further ensuring the quality and reliability of welding.

[0050] Summary: Aluminum 1100 is selected as the conductor material mainly because it has significant advantages in conductivity, processability, weldability, corrosion resistance, cost-effectiveness and environmental protection. In particular, in the flexible circuit board assembly of the present invention, the use of aluminum 1100 as the conductor material can not only reduce production costs and reduce product weight, but also improve product reliability and stability in long-term use. These advantages make aluminum 1100 an ideal material choice for such applications.

[0051] The 1060 aluminum material is used as the conductor material of the voltage busbar. The selection has the following important reasons, which are combined with the technical characteristics and application requirements of the present invention. Specifically, they are as follows: 1. Good conductivity: 1060 aluminum is a high-purity aluminum material with very good conductivity, and its conductivity is second only to copper. Although copper has higher conductivity, the conductivity of aluminum is sufficient to meet the requirements of the voltage busbar in the new energy battery system, especially in large-scale applications. The use of aluminum materials can effectively reduce costs while ensuring the normal operation of the system. 2. Low cost and high cost performance: Compared with copper, the raw material cost of 1060 aluminum is much lower than that of copper, and in the process of mining, production and processing, aluminum resources are more abundant, the price volatility is smaller, and it has a more stable price advantage. This makes the use of aluminum materials can significantly reduce the overall production cost of the battery information acquisition system, especially in large-scale production, the cost advantage is more prominent. 3. Superior processing performance: 1060 aluminum has good processing performance, is easy to form and process, and is particularly suitable for use as a voltage busbar material. The plasticity and mechanical strength of aluminum materials during processing are ideal, and they can be better connected with other materials such as the conductor material aluminum 1100 of the FPC body. When using the laser welding process, the consistency with the aluminum 1100 material makes the welding process simpler and more reliable. The connection points after welding are highly reliable, which can ensure the stability of the system during long-term operation, reduce failures or performance degradation caused by welding problems, and simplify the production process. 4. Lower density, reduced system weight: The density of 1060 aluminum material is lower than that of copper, about one-third of copper, which means that the use of aluminum voltage bus will greatly reduce the weight of the entire battery information collection system. In new energy battery systems, lightweight is an important factor in improving energy efficiency and extending battery life. Therefore, the use of 1060 aluminum can reduce product weight while ensuring functionality, meeting the requirements of new energy batteries for lightweight and high energy efficiency. Easy to weld and connect:

[0052] The selection of 1060 aluminum as the conductor material for the voltage busbar is based on its advantages such as good conductivity, low cost, easy processing, good compatibility and low density. Especially in the new energy battery system, 1060 aluminum can meet the battery information collection system's demand for high-efficiency, low-cost and sustainable products, further improving the system's reliability and market competitiveness. At the same time, this choice also simplifies the entire system in the production process, further reducing costs and complexity, and conforming to the efficient and green production trend of modern manufacturing.

[0053] The laser welding process is adopted mainly for the following considerations and technical requirements, especially in the production process of aluminum-based flexible circuit board components: 1. Adapt to the welding characteristics of aluminum metal: The physical properties of aluminum metal are quite different from those of copper metal, especially during welding, the surface of aluminum is easily oxidized, and the thermal conductivity of aluminum is relatively strong. Traditional welding processes (such as SMT soldering) are usually difficult to directly process aluminum metal, and are prone to unstable welding quality and insufficient strength. Laser welding has the following advantages: High precision and controllability: Laser welding can accurately control the temperature and heat of the welding point, avoiding the deformation and oxidation of aluminum metal caused by overheating. Deep welding ability: The laser can penetrate deep into the metal surface to form a deep and strong welding point, which is particularly suitable for low-melting-point materials such as aluminum metal, and can achieve strong welding strength. Reduce oxidation: The local heating characteristics of laser welding can effectively reduce the oxidation of the aluminum surface during welding and improve the welding quality. 2. Improve welding reliability: The aluminum-based flexible circuit board (FPC) used in the present invention is consistent with the materials of components such as the voltage bus, NTC branch FPC, and connector branch FPC, all of which are aluminum metal. Laser welding can provide a more reliable and stable connection between the same materials, and the problems of thermal expansion differences and welding strength mismatch between different materials can be effectively avoided. In addition, the use of laser welding simplifies the welding process and reduces the risk of connection failure caused by improper temperature control, thereby improving the reliability of the battery information acquisition system in long-term operation. 3. Simplify the production process: Traditional welding processes (such as SMT soldering) often require complex procedures in large-size circuit boards, such as additional metal connectors (such as nickel sheets) or multiple welding operations. After laser welding, the voltage bus and the pads of the FPC can be directly connected together without the need for additional connectors or complex welding processes. Laser welding simplifies the materials and process flow, effectively reducing the steps and links in production. This not only improves production efficiency, but also reduces equipment investment and manual operation requirements, and reduces production costs. 4. Avoid the use of complex connection components: The high precision of laser welding enables direct connection between the voltage bus and the FPC circuit board, thereby avoiding the use of nickel sheet connectors in traditional welding processes. This simplified structural design reduces the demand for parts, reduces material waste, and further reduces costs. 5. Improve product performance and consistency: Laser welding can provide more uniform and consistent welding quality, ensuring that the quality of each welding point can be strictly controlled. Compared with traditional welding processes, laser welding can complete complex connection tasks more accurately, especially under the requirements of tiny welding points and high-density circuit boards, which can ensure the consistency and stability of product performance. 6. Environmental friendliness and energy saving: The precise heating of laser welding can reduce overheating of materials, reduce energy consumption, and reduce the impact on the environment during operation.Compared with traditional welding processes, laser welding has advantages in heat treatment and exhaust gas emissions, and meets the current requirements of industrial green manufacturing and energy conservation and emission reduction. 7. Adapt to large-scale production needs: With the increasing demand for flexible circuit board components in new energy battery systems, the use of laser welding technology can better adapt to the needs of large-scale production. Laser welding can be produced automatically and efficiently, and can meet the high precision and high consistency requirements of mass production.

[0054] By adopting laser welding, we can achieve significant technical advantages in improving the welding quality of aluminum-based flexible circuit board components, simplifying production processes, reducing costs and improving production efficiency. Laser welding can not only effectively overcome the welding difficulties of aluminum metal, but also ensure the performance of products through high precision and reliability, which meets the needs of modern manufacturing industry for high efficiency, low cost and environmental protection.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but will not deviate from the spirit of the present invention or exceed the defined scope. Although the present invention is described and described in detail in the drawings and the foregoing description, such descriptions and descriptions are considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, changes and modifications may be made by a person of ordinary skill. Specifically, the present invention encompasses additional embodiments having any combination of features from the above-mentioned different embodiments. With respect to the use of the expression "generally" or "substantially", this patent application should be understood to disclose that these features and values ​​are also fully satisfied, i.e., there is no aforementioned characterization as "generally" or "substantially".

Claims

1. A flexible circuit board component of a battery CCS assembly for information collection, comprising an FPC body, the FPC body being provided with a plurality of temperature collection areas and a plurality of voltage collection areas, characterized in that: Each temperature collection area of ​​the FPC body is connected to the corresponding NTC branch FPC by laser welding, and the pad of each voltage collection area of ​​the FPC body is connected to the corresponding voltage bus in the CCS assembly by laser welding; the output end of the FPC body is connected to the connector branch FPC by laser welding; The conductor materials of the voltage bus, the FPC body, the connector branch FPC and the NTC branch FPC are all made of aluminum.

2. The flexible circuit board assembly of the battery CCS assembly for information collection as claimed in claim 1, characterized in that: When the connector branch FPC is connected to an external connector, the external connector is connected to the connector branch FPC by SMT soldering.

3. The flexible circuit board assembly of the battery CCS assembly for information collection as claimed in claim 1, characterized in that: When the NTC branch FPC is connected to the NTC component, the NTC component is connected to the NTC branch FPC by SMT soldering.

4. The flexible circuit board assembly of the battery CCS assembly for information collection as claimed in claim 1, characterized in that: Before welding, the aluminum surface of the connector branch FPC to be welded area is treated with chemical nickel gold.

5. The flexible circuit board assembly of the battery CCS assembly for information collection as claimed in claim 1, characterized in that: Before welding, the aluminum surface of the NTC branch FPC to be welded is treated with chemical nickel-gold.

6. The flexible circuit board assembly of the battery CCS assembly for information collection as claimed in claim 1, characterized in that: The specific type of conductor material of the FPC body, the connector branch FPC and the NTC branch FPC is aluminum 1100.

7. The flexible circuit board assembly of the battery CCS assembly for information collection as claimed in claim 1, characterized in that: In the CCS assembly, PC blister tray is selected as the load-bearing component.

8. The flexible circuit board assembly of the battery CCS assembly for information collection as claimed in claim 7, characterized in that: The voltage bus is fixed on the PC blister plate by a hot riveting process.

9. The flexible circuit board assembly of a battery CCS assembly for information collection as claimed in claim 1, characterized in that: The pads in the voltage collection area of ​​the FPC body are designed with double openings.

10. The flexible circuit board assembly of a battery CCS assembly for information collection as claimed in claim 1, characterized in that: The voltage busbar in the CCS assembly is specifically an aluminum busbar.

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