Main-gate-free and high-efficiency back-contact solar cell module, main-gate-free and high-efficiency back-contact solar cell assembly, and preparation process thereof

A back-contact solar cell assembly, comprising at least a first solar cell module and a second solar cell module;

• with the first solar cell module comprising first solar cell module cells a first solar cell module electrical connection layer, a first solar cell module backlight side of the first solar cell module cells having
• first solar cell module P-electrodes connected to a first solar cell module P-type doping layer wherein there are no through holes in the first solar cell module P-type doping layer and the first solar cell module P-electrodes do not pass through the first solar cell module P-type doping layer;
• first solar cell module N-electrodes connected to a first solar cell module N-type doping layer wherein there are no through holes in the first solar cell module N-type doping layer and the first solar cell module N-electrodes do not pass through the first solar cell module N-type doping layer;
• and a first solar cell module insulating layer located between the first solar cell N-type and first solar cell P-type electrodes;
• characterized in that the first solar cell module electrical connection layer comprises a number of first solar cell module parallel leads extending beyond an edge of the first solar cell module each physically connected to a portion of the first solar cell module P-electrodes or a portion of the first solar cell module N-electrodes with the first solar cell module insulating layer in contact with the first solar cell module P-type electrodes and the first solar cell module N-type electrodes and at least partially encompassing the first solar cell module parallel leads physically connected to the first solar cell module P-electrodes, and the first solar cell module parallel leads physically connected to the first solar cell module N-electrodes;
• with the second solar cell module comprising second solar cell module cells, a second solar cell module electrical connection layer, a second solar cell module backlight side of the second solar cell module cells having
• second solar cell module P-electrodes connected to a second solar cell module P-type doping layer wherein there are no through holes in the second solar cell module P-type doping layer and the second solar cell module P-electrodes do not pass through the second solar cell module P-type doping layer,
• second solar cell module N-electrodes connected to a second solar cell module N-type doping layer wherein there are no through holes in the second solar cell module N-type doping layer and the second solar cell module N-electrodes do not pass through the second solar cell module N-type doping layer,
• and a second solar cell module insulating layer located between the second solar cell N-type and second solar cell P-type electrodes;
• wherein
• each first solar cell module parallel lead physically connected to a portion of the first solar cell module P electrodes is physically connected to a portion of the second solar cell module N-electrodes, or
• each first solar cell module parallel lead physically connected to a portion of the first cell N-electrodes is physically connected to a portion of the second solar cell module P-electrodes
• with the second solar cell module insulating layer in contact with the second solar cell module P-type electrodes and the second solar cell module N-type electrodes and at least partially encompassing the first solar cell module parallel leads physically connected to the first solar cell module P-electrodes, and the first solar cell module parallel leads physically connected to the first solar cell module N-electrodes.