A photovoltaic standard battery module structure and manufacturing method thereof

Abstract

The present application discloses a photovoltaic standard battery module structure and a manufacturing method thereof, wherein the photovoltaic standard battery module structure includes a standard battery, a base plate and a peripheral frame, wherein the peripheral frame surrounds the standard battery and does not directly contact the standard battery, and the peripheral frame and the standard battery are arranged on the base plate; the standard battery includes a front grid electrode, a battery semiconductor layer and a battery back metal electrode, wherein the battery back metal electrode is connected to the base plate through a conductive connection; the front grid electrode is connected to the peripheral frame through a conductive interconnection structure; the peripheral frame is connected to the base plate through an insulating layer; the base plate and the peripheral frame are both made of conductive materials, so that the probe contacts the base plate and the peripheral frame for battery detection. According to the photovoltaic standard battery module structure and the manufacturing method thereof of the present application, under the condition of meeting the accuracy of photovoltaic standard battery testing, mechanical damage to the battery by the test probe is avoided, thereby extending the service life of the standard battery.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic cell packaging technology, and specifically relates to a structure and a manufacturing method of a photovoltaic standard cell module. Background Art

[0002] At present, the electrical performance of mass-produced photovoltaic cells is tested by solar simulators. To maintain the accuracy of the test, it is necessary to calibrate the standard battery regularly. There are generally two ways to use standard batteries: one is to use the standard battery for calibration directly, and the other is to package the standard battery into a module for use. Directly using the standard battery for calibration requires multiple probes to contact the battery grid electrode. The battery is easily damaged mechanically, and the electrode will oxidize during the storage of the battery. It will be affected by water vapor or other chemicals, resulting in a shortened life of the standard battery, performance degradation, and affecting the test accuracy and stability. The existing standard battery packaging structure is generally suitable for crystalline silicon cells. The back electrode of the crystalline silicon cell is the grid line, and the grid line is welded to lead out the wire to form an interconnection. Although this method can also be used for photovoltaic cells with a whole metal back, it wastes the advantages of the battery's large conductive area and excellent thermal conductivity. In addition, the existing standard battery packaging structure has air between the battery and the transparent window layer, and there is no other filler. Long-term use will be affected by water vapor, resulting in a decrease in battery efficiency. At the same time, the grid line will also oxidize, affecting the test accuracy and stability. Summary of the invention

[0003] In response to the above problems in the prior art, the present application develops a structure and manufacturing method of a photovoltaic standard battery module, which is used for photovoltaic cells with a metal back electrode to solve the problem that standard batteries are easily mechanically damaged during testing, and the electrodes will be oxidized during battery storage and will be affected by water vapor or other chemical substances.

[0004] According to one aspect of the present application, a photovoltaic standard cell module structure is provided, comprising a standard cell, a base plate and a peripheral frame.

[0005] The peripheral frame surrounds the standard battery and does not directly contact the standard battery, and the peripheral frame and the standard battery are arranged on the bottom plate;

[0006] The standard battery comprises a front grid electrode, a battery semiconductor layer and a battery back metal electrode, wherein the battery back metal electrode is connected to the bottom plate through a conductive connection; the front grid electrode is connected to the peripheral frame through a conductive interconnection structure; and the peripheral frame is connected to the bottom plate through an insulating layer;

[0007] The bottom plate and the peripheral frame are both made of conductive materials, so that the probe contacts the bottom plate and the peripheral frame for battery detection.

[0008] According to an embodiment of the present application, the inner periphery of the peripheral frame is in a stepped structure, and the front gate line electrode is connected to the edge of the first step of the stepped structure through the conductive interconnect structure.

[0009] According to one embodiment of the present application, the peripheral frame is in a rectangular, circular or square shape with a central through hole, and the standard battery is arranged in the central through hole.

[0010] According to one embodiment of the present application, transparent glue is used to fill between the standard battery and the peripheral frame and above the standard battery.

[0011] According to one embodiment of the present application, the photovoltaic standard cell module structure further includes a transparent cover, which is located above the standard cell and supported at the second step of the stepped structure of the peripheral frame, and transparent glue is filled between the transparent cover, the peripheral frame and the standard cell.

[0012] According to an embodiment of the present application, the light transmittance of the transparent cover and the transparent glue is greater than 90% in the spectral range of 300nm to 1800nm.

[0013] According to an embodiment of the present application, the conductive interconnection structure is an interconnection sheet or a metal wire.

[0014] On the other hand, the present application provides a method for manufacturing a photovoltaic standard battery module structure, comprising:

[0015] S1. Material preparation: providing a standard battery, a transparent cover plate, a conductive bottom plate and a conductive peripheral frame, wherein the standard battery structure includes a front grid electrode, a battery semiconductor layer and a battery back metal electrode from top to bottom;

[0016] S2, Insulation: The edge of the standard battery is insulated, and the bottom surface of the conductive outer frame is coated with insulating glue;

[0017] S3, fixation: fix the peripheral frame to the conductive bottom plate;

[0018] S4, welding: coating the metal electrode on the back of the battery with a conductive connector, and then welding it to the metal base plate to form a back electrode circuit connection; then electrically connecting the grid line electrode on the front of the battery and the edge of the peripheral frame through interconnection technology;

[0019] The battery is located in the peripheral frame and is not in direct contact with the peripheral frame; the bottom plate and the peripheral frame are both made of conductive materials, so that the probe contacts the bottom plate and the peripheral frame for battery detection.

[0020] According to one embodiment of the present application, the method for manufacturing the photovoltaic standard battery module structure further includes:

[0021] S5. Glue filling: Fill the space between the outer frame and the battery and above the battery with transparent glue, and then cover with a transparent cover.

[0022] According to one embodiment of the present application, the battery front grid line electrode and peripheral frame interconnection technology includes reflow soldering technology, wire bonding technology, hot pressing welding technology or resistance welding technology.

[0023] According to the photovoltaic standard battery module structure and its manufacturing method of the present application, mechanical damage to the battery by the test probe can be avoided while meeting the accuracy of the photovoltaic standard battery test; on the other hand, oxygen, water vapor and other chemicals can be isolated, greatly extending the service life of the standard battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1a is a schematic diagram of a photovoltaic standard battery module structure according to an embodiment of the present application;

[0025] Figure 1b yes Figure 1a sectional view of

[0026] Figure 2 is a schematic diagram of a battery peripheral frame according to an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of a welding cross-section of a photovoltaic standard battery module structure according to an embodiment of the present application;

[0028] Figure 4 is an overall cross-sectional schematic diagram of a photovoltaic standard battery module structure according to an embodiment of the present application;

[0029] Figure 5 is a three-dimensional effect schematic diagram of a photovoltaic standard battery module structure according to an embodiment of the present application;

[0030] Figure 6 is a schematic diagram of a battery peripheral frame structure of a photovoltaic standard battery module structure according to another embodiment of the present application;

[0031] Figure 7 is a schematic diagram of a welding cross-section of a photovoltaic standard battery module structure according to another embodiment of the present application; and

[0032] Figure 8 It is an overall cross-sectional schematic diagram of a photovoltaic standard battery module structure according to another embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. In the drawings, components with the same or similar functions are indicated by the same or similar reference numerals. In addition, for some components that are not directly related to the concept of the present invention, their illustrations may be omitted. The description of the drawings and specific embodiments is only for a better understanding of the present invention, and the present invention is not limited to the embodiments illustrated in the drawings and described in the specification.

[0034] The technical terms or scientific terms used in the present invention should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The use of "including" or "comprising" and similar words in the present invention indicates an open meaning, and does not exclude other elements, components, parts or items except for the elements, parts, parts or items clearly listed. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. "First", "second" and the like are used to distinguish different components and do not indicate a specific order.

[0035] like Figure 1a , 1b , Figure 2-8 As shown, the present application provides a photovoltaic standard battery module structure, including: a standard sub-cell, a base plate 3-1, and a battery peripheral frame 2-1. The structure of the standard sub-cell includes a front grid electrode, a battery semiconductor layer 1-2, and a sub-cell back electrode 1-3 from top to bottom. The front grid electrode is composed of a main grid line 1-1 and a fine grid line 1-4. The sub-cell back electrode 1-3 is connected to the base plate 3-1 through a conductive connection 3-2; the conductive connection 3-2 can be solder paste or conductive glue. The sub-cell front main grid 1-1 is connected to the edge of the battery peripheral frame 2-1 through a conductive interconnection structure 3-6; the battery peripheral frame 2-1 is connected to the base plate 3-1 through an insulating layer 3-3, and the sub-cell is located in the battery peripheral frame 2-1, separated from the battery peripheral frame 2-1 and not in direct contact with the battery peripheral frame. The base plate 3-1 and the battery peripheral frame 2-1 are both made of conductive materials, and the probe contacts the base plate 3-1 and the battery peripheral frame 2-1 for battery detection. Optionally, the battery peripheral frame 2-1 and the bottom plate 3-1 are made of metal materials with excellent electrical conductivity and oxidation resistance, such as silver-plated copper, oxygen-free copper, plated metal or alloy.

[0036] In the above embodiment, the metal electrode on the back of the battery is directly welded to the bottom plate through a conductive material, with a large contact area, and the metal has fast heat conduction. The battery temperature is stable during testing through the metal's rapid heat conduction, and the battery temperature can be kept consistent with the test environment temperature through the metal's rapid heat conduction, so the test data is accurate. In addition, the probe contacts the bottom plate and the battery's peripheral frame for battery testing, and does not directly contact the battery, avoiding mechanical damage to the battery by the test probe, thereby extending the service life of the standard battery.

[0037] like Figure 2-3 , Figure 5-6 As shown, the edge of the battery peripheral frame 2-1 is a step structure, and the step structure may include one or more steps. The sub-battery front grid line electrode 1-1 is connected to the edge of the step through a conductive interconnection structure 3-6. Optionally, the peripheral frame 2-1 may be a rectangular, circular or square shape with a central through hole, and the central through hole may be a rectangular, circular or square shape. The standard battery is arranged in the central through hole. The conductive interconnection structure is, for example, an interconnection sheet or a metal wire. The interconnection sheet may be a pure metal foil, a Kovar alloy foil or a surface-plated foil, a tin-coated copper strip, etc. The metal wire may be a gold wire, an aluminum wire, a copper wire, or a silver wire.

[0038] According to some embodiments of the present invention, Figure 4 As shown, transparent glue 4-4 is used to fill the space between the battery and the outer frame 2-1 and above the battery. Optionally, the transparent glue has a transmittance of >90% in the spectral range of 300nm to 1800nm. By filling with transparent glue, the module structure can effectively protect the sub-battery, isolate oxygen, water vapor or other chemicals, and prevent the battery from mechanical damage, so that the standard sub-battery can maintain stable performance during the use cycle. Further, as Figure 2-4 As shown, the photovoltaic standard battery module structure also includes a transparent cover 4-1, which is located above the transparent glue 4-4 to protect the transparent glue and the batteries below.

[0039] Or, if Figure 6-8 As shown, the transparent cover 4-1 is located above the standard battery and supported at the second step of the stepped structure of the peripheral frame 2-1, and a transparent glue 4-4 is filled between the transparent cover 4-1, the peripheral frame 2-1 and the standard battery. Optionally, the cover plate is made of: quartz glass, PMMA and other high-transmittance materials. Optionally, the light transmittance of the transparent cover plate is greater than 90% in the spectral range of 300nm to 1800nm. Optionally, the surface of the transparent cover plate is coated with an anti-reflection film.

[0040] By using a transparent cover plate and transparent adhesive with high light transmittance, preferably with a transmittance greater than 90% in the spectral range of 300nm to 1800nm, the solar simulator light source can reach the battery surface without attenuation of light intensity and spectrum shift, thus ensuring the accuracy of the test data.

[0041] Another aspect of the present application provides a method for manufacturing a photovoltaic standard battery module structure, the manufacturing steps are as follows:

[0042] S1. Material preparation: provide a standard battery, a transparent cover, a conductive bottom plate, and a conductive battery peripheral frame; the standard battery structure includes a front grid electrode, a battery semiconductor layer, and a sub-battery back electrode from top to bottom;

[0043] S2. Insulation: The edges of standard batteries are insulated, and insulating glue is applied to the bottom surface of the metal battery outer frame;

[0044] S3, fixation: fix the battery outer frame to the metal base plate;

[0045] S4, welding: coating the metal electrode on the back of the battery with a conductive connector, and then welding it to the metal base plate to form a back electrode circuit connection; then the main grid on the front of the battery and the edge of the battery peripheral frame are connected to the circuit through an interconnection sheet or a metal wire;

[0046] The battery is located in the battery peripheral frame and is not in direct contact with the battery peripheral frame. The bottom plate and the battery peripheral frame are both made of conductive materials, so that the probe contacts the bottom plate and the battery peripheral frame for battery detection.

[0047] In some embodiments, the manufacturing step further comprises the following steps:

[0048] S5, glue filling: fill the area around and above the battery with transparent glue, perform vacuum degassing, then cover with a transparent cover, clean up the overflow glue, and let it stand to solidify.

[0049] According to some embodiments of the present invention, the battery front and battery peripheral frame interconnection technology includes reflow soldering technology, metal wire bonding technology, hot pressing welding technology, and resistance welding technology.

[0050] According to some embodiments of the present invention, the outer edge of the battery peripheral frame may be rectangular, circular, square or the like; the central through hole of the frame may be rectangular, circular, square or the like.

[0051] Optionally, a light shielding process is performed on the area of ​​the module that does not affect the test, so as to reduce the influence of diffuse reflection of the module on the electrical performance test during the test.

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the concept of the present invention will be described below by taking an example of a specific standard battery.

[0053] Example 1

[0054] The structure of the present invention is described by taking a single-junction gallium arsenide standard sub-cell as an example, but is not limited to only including single-junction gallium arsenide sub-cells, and may also include other photovoltaic cells, such as crystalline silicon solar cells and other thin-film solar cells.

[0055] Still Figure 1a-1b For example, a single-junction gallium arsenide standard sub-cell structure includes a front main grid 1-1, a front fine grid 1-4, a back electrode 1-3, and a semiconductor layer 1-2, wherein the front main grid 1-1 has a width of 0.5 mm; single-junction standard sub-cells can be selected as: GaAs single-junction sub-cells, GaInP single-junction sub-cells, InGaAs single-junction sub-cells, and the cell epitaxial structure can be upright or inverted; cell types include rigid substrate cells and flexible substrate cells.

[0056] See also Figure 3 The single junction sub-cell module structure includes: a bottom plate 3-1, a battery, and a battery peripheral frame 2-1, wherein the battery peripheral frame 2-1 and the bottom plate 3-1 are both made of conductive materials; the sub-cell back electrode 1-3 is connected to the bottom plate 3-1 through a conductive connector 3-2; the conductive connector 3-2 can be a conductive glue, and the conductive glue includes solder paste, silver glue, gold glue, copper glue, nickel glue, aluminum glue, carbon conductive glue, and nano-carbon tube conductive glue. The battery peripheral frame 2-1 and the bottom plate 3-1 are made of metal materials with excellent conductivity and oxidation resistance, such as silver-plated copper, oxygen-free copper, plated metal or alloy.

[0057] The sub-cell front main grid 1-1 is connected to the inner edge of the battery peripheral frame 2-1 through the interconnection structure 3-6; the battery peripheral frame 2-1 is connected to the bottom plate through the insulating layer 3-3, and the sub-cell is located in the battery peripheral frame 2-1 and does not directly contact the battery peripheral frame, so that the probe contacts the bottom plate and the peripheral frame for battery detection. Figure 3-4 , the interconnection structure can be selected as interconnection sheets 3-6; or see Figure 7-8 , the interconnection structure may be selected as metal wire 7 - 1 .

[0058] See also Figure 4 , fill the area around and above the battery with transparent glue 4-4; optionally, the transparent glue has a transmittance of >90% in the spectral range of 300nm to 1800nm. Then, cover the cover plate 4-1 on top of the transparent glue 4-4. Optionally, the cover plate 4-1 is made of: quartz glass, PMMA and other high transmittance materials, optionally, the transparent cover plate has a transmittance of >90% in the spectral range of 300nm to 1800nm, and optionally, the surface of the transparent cover plate is coated with an anti-reflection film.

[0059] Example 2

[0060] Taking a single-junction gallium arsenide standard subcell as an example, the method for preparing the structure of the present invention is described.

[0061] S1 Material preparation: Standard battery structure see Figure 1a-1b The battery size is 10mm×10mm, mainly including the front fine grid 1-4, the front main grid 1-1 and the back metal electrode 1-3. The battery outer frame is shown in Figure 2 , whose inner edge is a stepped structure. The transparent cover plate 4-1 is supported on the stepped structure of the peripheral frame 6-1 to prevent the transparent cover plate from squeezing the battery and to facilitate the setting of the interconnection structure;

[0062] S2 Insulation: Insulate the battery edge; Insulate the bottom surface of the battery outer frame 2-1. Figure 3 Positions 3-5 and 3-3 in the middle are the insulation layers of the battery edge and the bottom surface of the battery peripheral frame respectively;

[0063] S3 fixation: fix the battery outer frame to the bottom plate with structural adhesive 3-4;

[0064] S4 welding: Figure 3 As shown, the metal electrode 1-3 on the back of the battery is coated with solder paste and mounted on the metal base plate 3-1, the main grid 1-1 on the front is coated with solder paste, the interconnection sheet 3-6 is installed, the other end of the interconnection sheet is coated with conductive glue, and it is installed on the edge step of the battery peripheral frame 2-1; then the standard battery module is placed in a reflow oven, heated and cured to form a fusion zone 3-2, the battery back electrode 1-3 and the metal base plate 3-1 are interconnected in circuit, and the main grid 1-1 on the front of the battery is interconnected in circuit with the battery peripheral frame 2-1 through the interconnection sheet. Among them, the battery does not directly contact the battery peripheral frame.

[0065] The welding process adopts non-contact reflow soldering, which effectively avoids hidden crack damage to the battery caused by hot pressure welding, and the solder joints are uniform and beautiful. The tin alloy formed after the solder paste is melted has good electrical conductivity and thermal conductivity. The good thermal conductivity allows the temperature of the standard battery to remain stable during the test, thereby increasing the stability of the test data.

[0066] S5 Glue filling: fill transparent glue 4-4 around and above the battery, then put the standard battery module into a vacuum degassing machine to remove bubbles in the glue. After completion, cover the transparent cover plate 4-1 onto the outer frame support structure, and the module is completed when the transparent glue is cured.

[0067] The requirements for the module transparent glue and quartz glass are: the transmittance is greater than 90% in the spectral range of 300nm to 1800nm. The test probe or electrode can be connected in the 4-3 and 4-2 areas.

[0068] Example 3

[0069] Another aspect of the present application is a method for manufacturing a standard sub-cell calibration module, which also takes a single-junction gallium arsenide standard sub-cell as an example and uses a metal wire to connect the battery positive electrode and the battery outer frame.

[0070] S1 Material preparation: Standard battery structure see Figure 1a-1b , the same as in Example 1; the battery peripheral frame see Figure 6 The step structure is used to prevent the transparent cover from squeezing the battery and metal wires and to facilitate the setting of the interconnection structure.

[0071] S2 Insulation: Insulate the edge of the battery; Insulate the bottom surface of the battery outer frame 6-1.

[0072] S3 fixed: see Figure 7-8 , fix the battery outer frame 6-1 to the bottom plate 3-1 with structural adhesive.

[0073] S4 welding: Coat the metal electrode 1-3 on the back of the battery with solder paste, mount it on the metal base plate 3-1, put it in the reflow oven for curing, and then, Figure 7-8 As shown, the front main grid 1-1 uses a metal wire bonding process (wire bonding) to connect the gold wire 7-1 to the first step of the edge of the battery peripheral frame 6-1. Since the gold wire 7-1 maintains a certain angle with the battery, there is no risk of short circuit, so the battery edge does not need to be insulated. Figure 7 . Among them, the battery is not in direct contact with the battery peripheral frame.

[0074] S5 glue filling: Figure 8 As shown, fill transparent glue around and above the battery, then put the module into a vacuum degassing machine to remove bubbles in the glue, and then cover the transparent cover plate 4-1 on the second step of the edge of the battery outer frame 6-1, and wait for the transparent glue to cure to complete the module production. Figure 8 .

[0075] The structure described in the embodiment of the present invention performs battery testing by directly contacting the conductive bottom plate and the battery outer frame with the probe, thereby avoiding direct contact between the probe and the battery and causing damage to the battery; at the same time, the metal bottom plate conducts heat quickly, which can keep the battery temperature consistent with the test environment temperature, and the test data is accurate.

[0076] The transparent glue fills the battery structure, effectively protecting the sub-batteries, isolating oxygen, water vapor or other chemicals, and preventing the batteries from mechanical damage, so that the standard sub-batteries can maintain stable performance during the use cycle.

[0077] The above embodiments are merely illustrative of the principles and structures of the present invention, and are not intended to limit the present invention. It should be understood by those skilled in the art that any changes and improvements made to the present invention without departing from the overall concept of the present invention are within the scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined by the claims of this application.

Claims

1. A photovoltaic standard cell module structure, comprising a standard cell, a base plate and a peripheral frame, The peripheral frame surrounds the standard battery and does not directly contact the standard battery, and the peripheral frame and the standard battery are arranged on the bottom plate; The standard battery comprises a front grid electrode, a battery semiconductor layer and a battery back metal electrode, wherein the battery back metal electrode is connected to the bottom plate through a conductive connection; the front grid electrode is connected to the peripheral frame through a conductive interconnection structure; and the peripheral frame is connected to the bottom plate through an insulating layer; The bottom plate and the peripheral frame are both made of conductive materials, so that the probe contacts the bottom plate and the peripheral frame for battery detection.

2. The photovoltaic standard cell module structure according to claim 1, wherein: The inner periphery of the peripheral frame is in a stepped structure, and the front gate line electrode is connected to the edge of the first step of the stepped structure through the conductive interconnection structure.

3. The photovoltaic standard cell module structure according to claim 1, wherein: The peripheral frame is in a rectangular or circular shape with a central through hole, and the standard battery is arranged in the central through hole.

4. The photovoltaic standard cell module structure according to claim 1, wherein: Transparent glue is used to fill the space between the standard battery and the peripheral frame and above the standard battery.

5. The photovoltaic standard cell module structure according to claim 2 further comprises a transparent cover, wherein the transparent cover is located above the standard cell and supported at the second step of the stepped structure of the peripheral frame, and transparent glue is filled between the transparent cover, the peripheral frame and the standard cell.

6. The photovoltaic standard cell module structure according to claim 5, wherein: The light transmittance of the transparent cover and the transparent adhesive in the spectral range of 300nm to 1800nm ​​is greater than 90%. 7 . The photovoltaic standard cell module structure according to claim 1 , wherein the conductive interconnection structure is an interconnection sheet or a metal wire.

8. A method for manufacturing a photovoltaic standard battery module structure, comprising: S1. Material preparation: providing a standard battery, a transparent cover plate, a conductive bottom plate and a conductive peripheral frame, wherein the standard battery structure includes a front grid electrode, a battery semiconductor layer and a battery back metal electrode from top to bottom; S2, Insulation: The edge of the standard battery is insulated, and the bottom surface of the conductive outer frame is coated with insulating glue; S3, fixation: fix the peripheral frame to the conductive bottom plate; S4, welding: coating the metal electrode on the back of the battery with a conductive connector, and then welding it to the metal base plate to form a back electrode circuit connection; then electrically connecting the grid electrode on the front of the battery and the edge of the peripheral frame through interconnection technology; The battery is located in the peripheral frame and is not in direct contact with the peripheral frame; the bottom plate and the peripheral frame are both made of conductive materials, so that the probe contacts the bottom plate and the peripheral frame for battery detection.

9. The method for manufacturing a photovoltaic standard battery module structure according to claim 8, further comprising: S5. Glue filling: Fill the space between the outer frame and the battery and above the battery with transparent glue, and then cover with a transparent cover.

10. The method for manufacturing a photovoltaic standard battery module structure according to claim 8, wherein: The battery front grid line electrode and peripheral frame interconnection technology includes reflow soldering technology, wire bonding technology, hot pressing welding technology or resistance welding technology.

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