CN108631431B

CN108631431B - Solar charger baby

Info

Publication number: CN108631431B
Application number: CN201810520172.XA
Authority: CN
Inventors: 李毅; 陈春屹; 邹观明; 李志坚
Original assignee: Shenzhen Chuangyi Wisdom Manufacturing Co ltd
Current assignee: Shenzhen Chuangyi Wisdom Manufacturing Co ltd
Priority date: 2018-05-28
Filing date: 2018-05-28
Publication date: 2022-03-11
Anticipated expiration: 2038-05-28
Also published as: CN108631431A

Abstract

The invention relates to a light, thin and foldable solar charging bank which is carried on a solar belt, belongs to the field of solar technology application, and aims to solve the problem that the key technology of reducing the volume of the solar charging carry-on belt is that the solar panel is easy to damage and poor in reliability due to the fact that the volume of the solar panel is reduced and the overall structure is more compact. The technical scheme provided by the invention is characterized in that the solar cell array is packaged by a multilayer circuit board, is connected by rotating shaft type electrodes, is charged reliably and is expanded rapidly. The solar panel forms a mobile power supply, the back contact type battery chip patch PCB is provided with a rotating shaft type electrode leading-out part and an externally connected charging controller, the mobile power supply can be folded and stored into a charging box type, and the solar panel is unfolded and converged to store energy and charge the charging control device. The beryllium copper rotating shaft type electrode connection is adopted, so that the strong electric connectivity between electrodes, high wear resistance and conductivity and strong reliability are enhanced.

Description

Solar charger baby

Technical Field

The invention discloses a portable light and thin foldable solar charging bank which can quickly expand a light receiving working surface of a solar panel and belongs to the technical field of solar application.

Background

In the internet big data era, electronic products are extremely rich, mobile phones are carried with the mobile phones, and more digital electronic products and the like need to be charged quickly at any time. Particularly, with the change of travel modes of people, the solar mobile power supply is produced and becomes an indispensable article for carrying. Particularly, the solar mobile power supply is moved outdoors, in areas without electricity, in frontier sentries and the like, is not limited to outdoors, and is also suitable for other solar mobile power supplies required by DIY. Solar mobile power sources are increasingly popularized, and a solar cell (panel) converts light radiation into electric energy, and the efficacy of the solar cell is in direct proportion to the light receiving area. Naturally, people need to pursue a solar mobile power supply which is large in light receiving area and convenient to carry. Research on solar mobile power sources has been developed towards high-efficiency portable power sources, and currently, products capable of being extended and folded are available. Like patent publication No. CN105811530A an extension formula solar charging is precious, disclosed to be formed with the receiver of accomodating folding flexible solar cell panel on the precious body that charges, hinged joint between the adjacent main substrate solves the precious confusion because of the solar cell panel area is little that charges, and charge efficiency is low. The problem is that the specific technique of the hinge connection and its details are not disclosed. The No. CN205039769U discloses a magnetic solar charger, which uses a magnet to electrically connect solar modules, and has a reliability problem as an ultra-thin design and uses a magnet to electrically connect. Patent publication No. CN100550435C discloses a solar cell panel and a manufacturing method thereof, and discloses a solar cell panel single-layer packaging technology which does not relate to a multi-layer packaging technology. Through the above analysis of the prior art, the solar mobile power supply, wherein the core component solar cell (panel), has not adopted the multilayer packaging technology with higher precision to solve the problem of safety and reliability, including voltage resistance and wear resistance, after the solar cell becomes light and thin.

Disclosure of Invention

In view of the above analysis and existing technical problems of the prior art, the present invention aims to break through the bottleneck of the prior art, to achieve a more compact and beautiful overall structure design, to achieve the structural design and packaging of the solar cell chip patch in the PCB multi-layer packaging technology, to be light, thin, non-deformable, portable, and convenient and fast charging.

And the other purpose is that the solar module selects an efficient back contact solar chip, adopts a multilayer circuit board packaging and laminating technology, realizes the rotating shaft type electrode connection, and is reliable in disassembly and folding.

The solar cell module (plate) has strong pressure resistance and is not easy to damage, and is suitable for being used in the field, in severe climatic conditions, in areas without electricity, in frontier defense whistle and the like.

The technical solution for realizing the task of the invention is as follows: the solar charger consists of N layers of PCB boards and cell chips, which are mounted on circuit board and connected via interconnecting circuit and packed into solar cell assembly, also called solar panel, with rotating shaft electrodes led out for connecting the charging controller and solar panel to constitute foldable mobile power supply in charging box, and the solar panel is expanded to work state for storing energy and charging the charging controller.

The solar cell module is characterized in that the N-layer PCB is also called N-layer circuit board packaging, a high-efficiency back contact type solar chip and a high-precision SMT chip mounter are selected, the cell chip is mounted on an internal connection type surface copper-plated PCB, and the solar cell module is formed by integrally laminating an adhesive film and a transparent high polymer material.

The solar panel is provided with a plurality of solar panels, the solar panels are provided with a plurality of solar panels, rotating shaft type electrodes are led out from the solar panels, the leading-out electrodes are led out from the edges of the two sides of the solar panels, the rotating shaft type electrodes on one side are connected with the charging control device externally connected rotating shaft type electrodes, and the rotating shaft type electrodes on the other side are electrically connected with the rotating shaft type electrodes led out from the edge of the other solar panel externally connected with the rotating shaft type electrodes.

The solar panel is foldable and contained in a charging box with a charging control device, the charging box comprises an upper shell, a middle shell and a lower shell, and the box is provided with a USB interface with a waterproof function, a waterproof power switch and a light guide column for displaying the electric quantity of a power supply.

The rotating shaft type electrode is a beryllium copper rotating shaft type electrode and comprises an inserting shaft, an umbrella-shaped elastic sheet and a winding type inserting hole. One end of the inserting shaft is a winding type inserting hole with a connecting sheet, and the other end of the inserting shaft is provided with an umbrella-shaped elastic sheet which is mutually inserted with the other winding type inserting hole with the connecting sheet.

The beryllium copper rotating shaft type electrode is a coaxial electrode with insulated positive and negative electrodes, a winding type jack with a connecting sheet and an electrode electric connecting piece which is provided with an umbrella-shaped elastic sheet, is used for mutually inserting the insulated positive and negative electrodes and can rotate.

The N layers of PCB boards comprise metalized through holes which are uniformly distributed on each layer of PCB board and are connected with positive and negative electrodes, the contact surface of the back contact type solar cell chip is a first layer, and the second layer and the N layers are sequentially connected through the metalized through holes to realize the in-line circuit connection.

The positive electrode metalized through hole of the first layer of positive and negative electrode metalized through holes is positioned below the positive electrode of the back contact type solar cell chip and is communicated with the positive electrode of the back contact type solar cell chip, and the negative electrode metalized through hole is positioned below the negative electrode of the back contact type solar cell chip and is communicated with the negative electrode of the back contact type solar cell chip.

And the second layer of PCB board is provided with a positive conductive belt and a negative conductive belt, the positive conductive belt is positioned below the positive metalized through hole of the first layer and is communicated with the positive electrode of the back-contact type solar cell chip, and the negative conductive belt is positioned below the negative metalized through hole of the first layer and is communicated with the negative electrode of the back-contact type solar cell chip. And the positive and negative electrode test metalized through holes are connected to positive and negative electrode test points on the back surface of the last PCB of the Nth layer, and the positive and negative electrode test points are communicated with the positive and negative electrodes of the back contact type solar cell chip.

The implementation of the invention achieves unexpected positive effects, and the invention is an innovation combining the prior art. The 'bottleneck' of solar panel electrode connection in the key technology is overcome, and beryllium copper rotating shaft type electrode connection in the core technology is adopted, so that the electric connectivity between electrodes is strong, the wear resistance and the conductivity are high, and the connection reliability is strong. The problems of higher stress damage, deformation and abrasion of the solar cell after the solar cell becomes light and thin are solved.

According to the embodiment of the invention, the design of four layers of hard PCB plates is adopted, so that the excessive abrasion of the back of the battery and the damage to a circuit are prevented. The compression test shows that once the solar panel is damaged, the solar panel can be directly replaced through the electrode connecting piece. The high-density material is good in water tightness, and waterproof paint is added on the back of the high-density material, so that the high-density material is prevented from being easily layered when the high-density material is used in a high-humidity climate. In order to make the periphery of the PCB thin enough, the four sides of the PCB adopt a copper plating process to increase the structural strength of the PCB. Efficient back contact solar energy chip is chooseed for use to solar energy component, cuts into the subassembly of equidimension through laser and the two kinds of processing of turbine, with high accuracy SMT's chip mounter, accurate array is on the PCB board, and the high rigidity board of FR4 is chooseed for use to PCB, through the copper facing of interior antithetical couplet formula surface.

Drawings

Fig. 1 is a schematic view of the overall structure of the solar mobile power supply of the present invention.

Fig. 2 is an exploded view of the back-contact solar panel package assembly of fig. 1.

Fig. 3 is a schematic diagram of a first layer structure of the circuit board in fig. 2.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic diagram of a second layer structure of the circuit board in fig. 2.

Fig. 6 is a schematic diagram of a third layer structure of the circuit board in fig. 2.

Fig. 7 is a schematic diagram of a fourth layer structure of the circuit board in fig. 2.

Fig. 8 is a schematic view of a connection structure of the spindle-type output electrodes of the back contact solar cell package assembly (hereinafter, the same as the solar cell panel) in fig. 1.

The working principle of the invention is further explained in the following with the attached drawings.

Referring to fig. 1, the upper case 1 of the charging box is provided with an attracting magnet (N pole) 2, the lower case 7 of the charging box is provided with an attracting magnet (S pole) 2', a turning shaft 3 is arranged in the charging box, the middle case 4 of the charging box and the lower case 7 of the charging box are embedded into a lower case body of the charging box, and a charging and discharging control circuit board is arranged in the lower case body. The lower box body is internally provided with a reverse shaft 3 which is connected with the charging box upper shell 2. The rotating shaft type electrode 5 is formed by electrically connecting a positive shaft with the solar cell panel 6 and the charging and discharging controller 18 in the charging box, the rotating shaft type electrode 5' is formed by combining a reverse shaft with the next solar cell panel 5, and every two rotating shaft type electrodes can be used in an interchangeable and superposed mode. See the scroll type insertion hole 51, the insertion shaft 52 and the umbrella-shaped elastic sheet 53 in fig. 8. The back contact solar cell module 6 is also called a solar cell panel, and the circuit board 61 is provided with a back contact solar cell chip 62, an adhesive film 63, a transparent film 64 and an edge copper sheet 65. The charging box comprises a charging box lower shell 7, a storage battery waterproof pad 9, a storage battery 10, a power switch waterproof ring 11, a power switch 12, a power switch cover 13, an electric quantity indicator lamp 14, an output port 15, an input port 16, a waterproof cover 17 and a charging and discharging controller 18.

See fig. 3, a first layer 611 of a circuit board, a battery chip positive pole bus bar 611-1, a battery chip positive pole metallization hole 611-2, a battery chip negative pole bus bar 611-3, a battery chip negative pole metallization hole 611-4, a battery chip position marking line 611-5, an insulating film 611-6, a conductive copper foil 611-7, a component positive pole metallization hole 611-8, a component negative pole metallization hole 611-9, a battery chip positive pole bus bar metallization hole 611-10, a battery chip negative pole bus bar metallization hole 611-11, a battery chip positive pole test point 611-12, a battery chip negative pole test point 611-13, and a battery chip positive pole jumper wire 611-14; the circuit board comprises a second layer 612 of the circuit board, a component positive pole bus bar 612-1, a component negative pole bus bar 612-2, a battery chip positive and negative pole series bus bar 612-3, a battery chip positive pole test bus bar 612-4, a battery chip negative pole test bus bar 612-5, a battery chip positive pole metalized hole 611-2, a battery chip negative pole metalized hole 611-4, a conductive copper foil 611-7, a component positive pole metalized hole 611-8, a component negative pole metalized hole 611-9, a battery chip positive pole bus bar metalized hole 611-10 and a battery chip negative pole bus bar metalized hole 611-11; a third layer 613 of the circuit board, an assembly positive conductive strip 613-1, an assembly negative conductive strip 613-2, an assembly positive test point metallization hole 613-3, an assembly negative test point metallization hole 613-4, a conductive copper foil 611-7, an assembly positive metallization hole 611-8 and an assembly negative metallization hole 611-9; a fourth layer 614 of the circuit board, an anode test point 614-1, a cathode test point 614-2, a conductive copper foil 611-7, an assembly anode metalized hole 611-8 and an assembly cathode metalized hole 611-9.

Detailed Description

Embodiment 1 fig. 1 and 2 are overall structural diagrams of embodiment 1, and fig. 3 to 7 are schematic diagrams of first-layer to fourth-layer circuit board package structures.

The design battery capacity is 5000 milliampere hours, the photovoltaic input voltage is 4.2V, a back contact type solar battery chip is selected, a solar battery assembly 6 is formed by mounting a back contact type solar battery chip 62 on a circuit board 61 according to a battery chip position marking line 611-5 of a first layer 611, packaging by an adhesive film 63 and a transparent film 64, the conversion efficiency of the back contact type solar battery chip 62 is 19% of SUNPOWER products, the battery chip 62 cuts two arrays of 31X12mm and 10X2, the size of 10 battery chips 31X12mm is connected in series and connected in parallel to form a back contact type solar battery assembly 6, a solar panel formed by four back contact type solar battery assemblies 6 outputs electric energy to a charge and discharge controller 18 through a rotating shaft type electrode (positive shaft) 5 and a rotating shaft type electrode (negative shaft) 5' in parallel connection, the charge and discharge controller 18 controls a storage battery 10 to charge the storage battery 10 through a USB input port, the output port 15 is externally connected with electronic equipment for power supply.

Fig. 3 shows that the edge of the first layer of circuit board 611 is disposed on the conductive copper foil 611-7, and has two sets of positive electrode metallized holes 611-8 and two sets of negative electrode metallized holes 611-9 for the battery assembly, the positive electrode position of the back electrode corresponding to the back contact type solar battery chip 62 on the first layer 611 is opened with a plurality of positive electrode metallized holes 611-2 for the battery chip 62, the negative electrode position is opened with a plurality of negative electrode metallized holes 611-4 for the battery chip, the positive electrode and the negative electrode of the battery chip 62 are respectively conducted with the positive electrode metallized holes 611-2 and the negative electrode metallized holes 611-4 for the battery chip, the positive electrode metallized holes 611-2 and the negative electrode metallized holes 611-4 for the battery chip are penetrated through the second layer 612, so that the first layer 611 and the second layer 612 are conducted, the positive electrode metallized holes 611-2 for the battery chip on the first layer 611 are converged on the positive electrode bus bar 611-1 for the battery chip, the battery chip negative electrode metalized hole 611-4 is converged on the battery chip negative electrode bus bar 611-3, the battery chip positive electrode bus bar 611-1 and the battery chip negative electrode bus bar 611-3 are respectively covered with an insulating film 611-6 to prevent the positive electrode of the battery chip 62 and the battery chip negative electrode bus bar 611-3 from being conducted, and prevent the negative electrode of the battery chip 62 and the battery chip positive electrode bus bar 611-1 from being conducted, the battery chip positive electrode bus bar metalized hole 611-10 is formed on the battery chip positive electrode bus bar 611-1, the battery chip negative electrode bus bar metalized hole 611-11 is formed on the battery chip negative electrode bus bar 611-3, the battery chip positive electrode bus bar metalized hole 611-10 and the battery chip negative electrode bus bar metalized hole 611-11 penetrate through the second layer 612 as shown in figure 5, and the cell chip positive and negative series bus bars 612-5 and 612-3 of the second layer 612. The adhesive film 63 is provided with a battery chip positive jumper wire 611-14 at a position where the transparent adhesive film 64 and the first layer 611 of the battery chip 62 correspond to the assembly negative bus bar 612-1 of the second layer 612, the battery chip positive test conductive bar 612-4 on the second layer 612 is conducted with the disconnected conductive bar 612-4 passing through the assembly negative bus bar 612-1, an assembly positive metalized hole 611-8 and an assembly negative metalized hole 611-9 are opened at the leading-out position of the positive and negative electrodes of the assembly edge to cover a conductive copper foil 611-7, and simultaneously penetrate through the second layer 612 to realize the conduction with the second layer 612, the terminal position of the battery chip positive test conductive bar 612-4 of the second layer 612 corresponds to a battery chip positive test point 611-12, the terminal position of the battery chip negative test conductive bar 612-5 of the second layer 612 corresponds to a battery chip negative test point 611-13, in order to test the electrical performance test points of each battery chip 612.

The positive pole bus bar 612-1 of the component and the positive pole metallization hole 611-2 of the battery chip penetrating the second layer are conducted on the second layer 612, part of the negative pole metallization holes 611-4 of the battery chip avoid the positive pole bus bar 612-1 of the battery component, the negative pole bus bar 612-2 of the battery component and the negative pole metallization holes 611-4 of the battery chip are conducted, part of the positive pole metallization holes 611-2 of the battery chip avoid the negative pole bus bar 612-2 of the component to prevent the short circuit of the negative pole and the positive pole, the positive pole and the negative pole series connection bus bar 612-3 of the battery chip on the second layer enable the positive pole metallization holes 611-10 of the battery chip 611 penetrating the second layer and the negative pole metallization holes 611-11 of the battery chip to be connected in series to realize the series connection of the longitudinal battery chips 62, and one electric pole metallization hole 611-2 of the battery chip 62 is led out from the positive pole metallization hole 611-2 of the battery chip on each battery chip on the second layer 612 respectively The cell chip positive electrode test conductive strip 612-7 is conducted with the first layer of cell chip positive electrode test point 611-12, two cell chip negative electrode test conductive strips 612-5 are led out from the second layer of assembly negative electrode bus strip 612-2 and conducted with the first layer of cell chip negative electrode test point 611-13, and the purpose of testing the electrical property of each cell chip 62 from the first layer of cell chip positive electrode test point 611-12 and the cell chip negative electrode test point 611-13 is achieved.

The third layer of the circuit board is provided with a battery assembly positive electrode conductive belt 613-1 in a 7 shape, the larger area of the margin of the letter head close to the third layer is provided with a positive electrode metalized hole 611-8, the battery assembly negative electrode conductive belt 613-2 is shorter and is provided with a battery assembly negative electrode metalized hole 611-9, and the two conductive copper foils 611-7 are provided with battery assembly positive and negative electrode metalized holes 611-8 and 611-9.

4 pairs of conductive copper foils 611-7 are distributed at the edge of the circuit board of the fourth layer 614, and positive and negative electrode metalized holes 611-8 and 611-9 are respectively formed in the conductive copper foils and correspondingly connected and conducted with the positive and negative electrode metalized holes of the third layer; the positive test point 614-1 passes through the third layer 613 of the positive conductive strap 613-1 and the negative test point 614-2 passes through the negative conductive strap 613-2. And U-shaped edge copper sheets 65 are arranged at the positive and negative leading-out positions of the edges of the circuit boards penetrating through the first layer to the fourth layer and are adhered to and conducted with the conductive copper foils 611-7 of the assembly positive metalized holes 611-8 and the assembly negative metalized holes 611-9, and the rotary shaft type positive and negative electrodes 5 and 5' are respectively arranged on the edge copper sheets 65 to realize the electric connection with the positive and negative electrodes of the back contact type solar cell assembly 6. The charging box is formed by buckling an upper charging box shell 1 and a lower charging box shell 7 through a built-in turnover shaft 3, a charging and discharging controller 18 is arranged in the lower shell 7, a power switch 12, an electric quantity indicator lamp 14, an output port 15 and an input port 16 are arranged on the charging and discharging controller 18, and is exposed from the lower side of the lower shell 7, a power switch waterproof ring 11 and a power switch cover 13 are arranged on the power switch 12, waterproof covers 17 are arranged at the openings of an output port 15 and an input port 16 to be opened, the storage battery 10 is arranged on a charge-discharge controller 18, a storage battery waterproof pad 9 is arranged on the storage battery 10 and is covered by the middle shell 4 of the charging box, the back contact type solar battery component 6 is folded and is placed on the middle shell 4, the upper charging box shell 1 is provided with an attraction magnet (N pole) 2 and the lower charging box shell 7 is provided with an attraction magnet (S pole) 2', the magnets are attracted together after being buckled, and the input interface 16 can be connected with a USB charging interface to directly charge the storage battery 10.

Embodiment 2 circuit board is two-layer structure design, and battery capacity is 6000 ma hour, and photovoltaic input voltage 4.2V, battery chip 62 cut 32X12mm, and two sets of arrays of 11X2 are parallelly connected after establishing ties and become back contact solar module 6, select the solar panel that 5 back contact solar module 6 constitute, and 4 pairs of conductive copper foil are laid to circuit board second layer edge, have positive negative electrode metallization hole and positive negative pole test point on it respectively. Otherwise, the same procedure as in example 1 was repeated.

Embodiment 3 a back-contact solar cell package assembly with three layers of circuit boards, wherein the designed cell capacity is 6000 ma, the photovoltaic input voltage is 4.2V, the contacted solar cell chips are selected, the cell chips 62 are cut into two arrays of 31X12mm and 10X2, 10 cell chips 31X12mm in size are connected in series and in parallel to form a back-contact solar cell assembly 6, and the other 6 back-contact solar cell assemblies 6 are the same as embodiment 1. The first and second layers of this embodiment are the same as those of example 1, and positive test point 614-1 and negative test point 614-2 corresponding to fourth layer 614 of example 1 are disposed on the back of the third layer of this embodiment.

Example 4 three-layer structure of PCB circuit board, when the battery capacity is 7000 ma, the photovoltaic input voltage is 5.2V, two sets of array battery chip sizes of 11X2 32X12mm are connected in series and in parallel two sets of 5 back-contact solar cell modules 6 constitute the solar panel array, and the others are the same as example 3. And will not be described in detail.

Embodiment 5 this example is an extended solar rapid charger, 8000 ma of battery capacity, photovoltaic input voltage 4.2V, four-layer structure of PCB, frosted PET + double-layer 0.25 thick EVA + patch laminate integrated layer, copper plating process is selected around PCB to increase structural strength. The back contact type solar cell module 6 selects 6 modules, carries a plurality of separated back contact type solar cell modules 6 in addition, connects the multi-strip solar cell modules 6 to be used, increases the power of the solar cell and realizes quick charging.

Claims

1. A solar charger is characterized in that a solar panel of the charger is mounted on a PCB by a battery chip and is packaged into a solar battery component, namely a solar panel, the solar panel is led out by a rotating shaft type electrode and is externally connected with a charging control device and the solar panel to form a foldable solar charging box, the charging box is an upper shell and a lower shell which are connected by a built-in turnover shaft, and magnets are mounted in the upper shell and the lower shell for attraction; the rotating shaft type electrode is a beryllium copper rotating shaft type electrode and comprises an inserting shaft, an umbrella-shaped elastic sheet and a winding type jack; the PCB is an N-layer circuit packaging board, wherein metalized via holes for connecting positive and negative electrodes are uniformly distributed on each layer of board, the contact surface of the PCB and a back contact type solar cell chip is a first layer, and is sequentially from a second layer to N layers, and the connection and the communication of the internal-connection type circuit are realized through the metalized via holes between each layer.

2. The solar charger according to claim 1, wherein the PCB is a high-efficiency back contact solar chip, and the battery chip is mounted on an internal copper-plated surface PCB by a high-precision SMT mounter, and is formed by integrally laminating an adhesive film and a transparent polymer material.

3. The solar charger according to claim 1, wherein the rotary electrodes on the solar panel are led out from the two side edges of the solar panel, wherein one side of the rotary electrodes is connected to the charging control device and the other side of the rotary electrodes is connected to the other side of the rotary electrodes.

4. The solar charger according to claim 3, wherein the rotation direction of the rotation shaft electrodes led out from the two side edges of the solar panel is positive and negative, so as to facilitate rapid expansion and incremental charging of the external solar panel, thereby realizing rapid charging uninterrupted power supply.

5. The solar charger according to any one of claims 1 to 4, wherein the solar panel is folded and stored in a charging box with a charging control device, the box body comprises an upper shell, a middle shell and a lower shell, and the box body is provided with a waterproof USB interface, a waterproof power switch and a light guide column for displaying the power quantity of the power supply.

6. The solar charger according to claim 1, wherein the beryllium copper rotary shaft type electrode is a coaxial electrode with insulated positive and negative electrodes, and is a winding type jack with a connecting piece and an electrode connecting piece which is provided with an umbrella-shaped spring piece, wherein the positive and negative electrodes are mutually insulated and are mutually inserted and can rotate.

7. The solar charger according to claim 1, wherein the first layer of positive and negative electrode metalized vias has a positive electrode metalized via located under a positive electrode of the back-contact solar cell chip and in electrical communication with a positive electrode of the back-contact solar cell chip, and a negative electrode metalized via located under a negative electrode of the back-contact solar cell chip and in electrical communication with a negative electrode of the back-contact solar cell chip.

8. The solar charger baby as claimed in claim 1, wherein the second layer PCB has positive and negative conductive bands, the positive conductive band is located under the positive metalized via hole of the first layer and is connected to the positive electrode of the back-contact solar cell chip, and the negative conductive band is located under the negative metalized via hole of the first layer and is connected to the negative electrode of the back-contact solar cell chip.

9. The solar charger of claim 1 or 8, wherein the second layer of PCB circuit board metallized vias further comprise a positive metallized via and a negative metallized via, the positive metallized via of the second layer being positioned on the positive conductive strip and offset from the positive metallized via of the first layer, the negative metallized via of the second layer being positioned on the negative conductive strip and offset from the negative metallized via of the first layer.

10. The solar charger according to claim 1, wherein the positive and negative bus bars of the last PCB are respectively provided with positive and negative test metallized through holes.

11. The solar charger of claim 10, wherein the positive test metallization via and the negative test metallization via are connected to a positive test point and a negative test point on the back side of the nth PCB of the charger, respectively, and the positive test point and the negative test point are respectively connected to the positive electrode and the negative electrode of the back contact solar cell chip.

12. The solar charger according to claim 1, wherein the solar panel is led out of the positive and negative rotating shaft type electrode rotating shafts, wherein the winding type insertion hole of the positive rotating shaft faces upward, and the winding type insertion hole of the negative rotating shaft faces downward, and is respectively installed at two sides of the solar panel packaging assembly.