阅读说明：本技术 一种烧结设备、电池的烧结退火方法及电池 (Sintering equipment, sintering annealing method of battery and battery ) 是由 庄宇峰 崔艳峰 袁声召 万义茂 林海峰 于 2020-07-23 设计创作，主要内容包括：本发明公开了一种烧结设备,烧结设备用于制备电池,电池为N型TOPCon电池；烧结设备内设有烘干区、烧结区和退火区；其中,烘干区用于对丝网印刷后的电池进行烘干,使得电池表面印刷的浆料中的有机物挥发；烧结区,用于对烘干后的电池进行烧结,使得电池表面形成良好的欧姆接触；退火区,用于对烧结后的电池进行退火,从而提升电池的钝化性能。通过本发明可保证不增加额外退火设备的基础上,实现电池的钝化性能提升。本发明还提供了一种电池的烧结退火方法及电池。(The invention discloses sintering equipment, which is used for preparing a battery, wherein the battery is an N-type TOPCon battery; a drying area, a sintering area and an annealing area are arranged in the sintering equipment; the drying area is used for drying the battery after screen printing, so that organic matters in the slurry printed on the surface of the battery are volatilized; the sintering area is used for sintering the dried battery so as to form good ohmic contact on the surface of the battery; and the annealing area is used for annealing the sintered battery, so that the passivation performance of the battery is improved. The invention can realize the improvement of the passivation performance of the battery on the basis of ensuring that additional annealing equipment is not added. The invention also provides a sintering annealing method of the battery and the battery.)

1. A sintering apparatus for producing a battery; the battery is characterized in that the battery is an N-type TOPCon battery; a drying area, a sintering area and an annealing area are arranged in the sintering equipment; the drying area is used for drying the battery after screen printing so as to volatilize organic matters in the metal slurry printed on the surface of the battery; the sintering area is used for sintering the dried battery so as to form good ohmic contact on the surface of the battery; and the annealing area is used for annealing the sintered battery, so that the passivation performance of the battery is improved.

2. The sintering apparatus according to claim 1, wherein the sintering apparatus comprises a sintering belt; and the sintering furnace belt is used for conveying the battery to a drying area, a sintering area and an annealing area in the sintering furnace in sequence under the driving of a motor.

3. The sintering apparatus as claimed in claim 1, wherein the drying temperature of the drying zone is 200 ° to 500 °.

4. Sintering apparatus according to claim 1, characterized in that the sintering temperature in the sintering zone is 700 ° to 900 °.

5. The sintering apparatus according to claim 1, wherein the annealing temperature of the annealing zone is 300 ° to 650 °; the annealing time is 10 s-180 s.

6. A sintering annealing method of a battery, which is applied to a sintering apparatus according to any one of claims 1 to 5, characterized in that the sintering annealing method comprises:

and (3) drying: conveying the battery subjected to screen printing to a drying temperature area, and drying the battery by setting the drying temperature;

sintering: conveying the dried battery to a sintering area in sintering equipment, and sintering the battery by setting a sintering temperature;

and (3) annealing: and conveying the sintered battery to an annealing area in sintering equipment, and annealing the battery by setting an annealing temperature.

7. The sintering annealing method of battery as claimed in claim 6, wherein the baking temperature is 200 ° to 500 °.

8. The sintering annealing method of battery as claimed in claim 6, wherein the sintering temperature is 700 ° to 900 °.

9. The sintering annealing method of battery according to claim 6, characterized in that the annealing temperature is 300 ° to 650 °; the annealing time is 10 s-180 s.

10. A battery prepared by the sintering annealing method of a battery according to any one of claims 6 to 9.

Technical Field

The invention relates to a battery preparation process, in particular to sintering equipment, a battery sintering and annealing method and a battery.

Background

The N-type TOPCon battery (Tunnel Oxide Passivated Contact battery) is a hot spot of industry research in the last two years. Generally, the front structure of an N-type TOPCon Cell is the same as that of an N-type PERT Cell (Passivated Emitter and reactor fully-diffused Cell), but the back structure of an N-type TOPCon Cell is not the same as that of an N-type PERT Cell, and is composed of a tunnel oxide layer, a doped polysilicon layer, and a passivation film. Meanwhile, the structure consisting of the tunneling oxide layer, the doped polycrystalline silicon layer and the passivation film is used as the back structure of the N-type TOPCon battery, so that the recombination loss of the back of the battery can be obviously reduced, and meanwhile, the contact performance of the battery is greatly improved, and the conversion efficiency of the battery is improved. Currently, the conversion efficiency of industrially produced N-type TOPCon batteries can be improved by about 1% compared with N-type PERT batteries.

In the traditional battery preparation process, when the battery is sintered, three processes of low-temperature drying, low-temperature sintering and high-temperature silver paste sintering are generally adopted. Namely, firstly, drying the battery at low temperature to volatilize organic matters in the metal slurry printed on the surface of the battery; then sintering the aluminum paste in the metal paste at a low temperature and simultaneously presintering the silver paste of the metal paste; and finally, sintering the metal paste silver paste at high temperature to realize the sintering process of the battery. Among these, such sintering processes are also being extended for N-type PERT cells.

However, the back structure of the N-type TOPCon battery is different from that of the N-type PERT battery. Research and test show that after the N-type TOPCon battery is sintered by adopting the traditional battery preparation process, the passivation performance of the surface of the battery is greatly reduced. For example, after an N-type TOPCon cell with a bilaterally symmetrical structure is sintered by using the conventional cell preparation process, the minority carrier lifetime and the ivoc (amplified voc) data change are shown in table 1:

TABLE 1

The testing of minority carrier lifetime and iVoc is a common means for testing the passivation performance of the battery in the field, and can intuitively and accurately reflect the passivation performance of the battery. As can be seen from table 1, after the N-type TOPCon battery with a double-sided symmetric structure is sintered by the conventional battery preparation process, the minority carrier lifetime and iVoc are reduced, and the passivation performance of the battery is reduced, which affects the use of the battery.

Disclosure of Invention

In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide a sintering apparatus, which can solve the problem of high apparatus cost in the prior art of improving the passivation performance of a N-type TOPCon battery.

The second objective of the present invention is to provide a sintering annealing method for a battery, which can solve the problem of high equipment cost in the prior art of improving the passivation performance of a N-type TOPCon battery by using a battery preparation process.

The invention further aims to provide a battery, which can solve the problem that the equipment cost is high when the passivation performance of an N-type TOPCon battery is improved by a battery preparation process in the prior art.

One of the purposes of the invention is realized by adopting the following technical scheme:

a sintering apparatus for producing a battery; the battery is an N-type TOPCon battery; a drying area, a sintering area and an annealing area are arranged in the sintering equipment; the drying area is used for drying the battery after screen printing so as to volatilize organic matters in the metal slurry printed on the surface of the battery; the sintering area is used for sintering the dried battery so as to form good ohmic contact on the surface of the battery; and the annealing area is used for annealing the sintered battery, so that the passivation performance of the battery is improved.

Further, the sintering equipment comprises a sintering furnace belt; and the sintering furnace belt is used for conveying the battery to a drying area, a sintering area and an annealing area in the sintering furnace in sequence under the driving of a motor.

Further, the drying temperature of the drying zone is 200-500 degrees.

Further, the sintering temperature of the sintering zone is 700-900 degrees.

Further, the annealing temperature of the annealing zone is 300-650 degrees; the annealing time is 10 s-180 s.

The second purpose of the invention is realized by adopting the following technical scheme:

a sintering annealing method of a battery, which is applied to a sintering apparatus employed as one of the objects of the present invention, comprising:

and (3) drying: conveying the battery subjected to screen printing to a drying area in sintering equipment, and drying the battery by setting a drying temperature;

sintering: conveying the dried battery to a sintering area in sintering equipment, and sintering the battery by setting a sintering temperature;

and (3) annealing: and conveying the sintered battery to an annealing area in sintering equipment, and annealing the battery by setting an annealing temperature.

Further, the sintering annealing method comprises the following steps: under the action of the motor, the batteries are sequentially conveyed to the drying area, the sintering area and the annealing area through the sintering furnace belt.

Further, the drying temperature is 200-500 degrees.

Further, the sintering temperature is 700-900 degrees.

Further, the annealing temperature is 300-650 degrees; the annealing time is 10 s-180 s.

The third purpose of the invention is realized by adopting the following technical scheme:

a battery prepared by a sintering annealing method of a battery as employed for the second object of the present invention.

Compared with the prior art, the invention has the beneficial effects that:

on the basis of sintering equipment used in a sintering process in the traditional battery preparation method, the temperature of each area in the conventional sintering furnace is divided into a drying area, a sintering area and an annealing area, so that the high-temperature sintering and low-temperature annealing of the N-type TOPCon battery are realized in the sintering furnace, the annealing process of the N-type TOPCon battery can be realized without adding any additional equipment, the passivation performance of the battery is improved, and the conversion efficiency of the battery is improved; the invention does not need to additionally increase any annealing equipment, thereby solving the problem that the production cost of enterprises is increased because the additional annealing equipment is needed to be increased for improving the passivation performance of the battery in the prior art.

Drawings

FIG. 1 is a schematic diagram of temperature zone distribution in a sintering apparatus provided by the present invention;

fig. 2 is a flow chart of a sintering annealing method of a battery provided by the invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.