Tool clamp for laser-assisted sintering of back contact battery

Abstract

The utility model discloses a tool clamp for laser-assisted sintering of a back contact battery. The tool clamp comprises an insulating fixing piece and a clamping piece, wherein the insulating fixing piece comprises a connecting part, a main body part and a clamping part; the connecting part is thicker than the clamping part; a through hole is formed in the connecting part; the plurality of clamping pieces are arranged on the insulating fixing piece in a sliding manner along the length direction, and each clamping piece comprises a connecting plate, a matching arm and two clamping arms; a clamping groove matched with the clamping part is defined by the two clamping arms and the connecting plate; the relation among the length L1 of the clamping arm, the width L2 of the clamping part and the distance L3 from one side edge, far away from the clamping part in the width direction, of the through hole to the clamping part is L2 < L1 < L2 + L3; the locking piece is used for locking or unlocking the relative position of the clamping piece and the insulating fixing piece; the plurality of probe rows are fixed on the matching arms in a one-to-one manner and are in one-to-one contact with the battery main grid lines; and the plurality of leads are conductively connected to the probe rows one to one. The LECO technology can be applied to the BC battery, and the battery filling rate and the battery efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cell manufacturing, in particular to a tooling fixture used for laser-assisted sintering of back-contact cells. Background Art

[0002] Back contact cells are also called BC cells. Their main feature is that the positive and negative electrodes of the cells are designed on the back of the cell panel, which can reduce or eliminate the shading loss of the front grid lines. This design not only improves the efficiency of the cell, but also makes it more convenient when packaging components, because all the electrodes are located on the back, which can reduce the spacing between the cells, increase the packaging density, and make the appearance more beautiful.

[0003] The P region of the BC battery uses silver paste printing on the P-poly to form a contact. However, since the majority carriers in the P region are holes, this causes the silver ions to be reduced to silver microcrystals, resulting in poor contact, which leads to a loss of filling performance and a decrease in efficiency of the battery. In the prior art, more silver ions are usually brought into the P-poly by adding a glass system to the slurry, thereby improving its conductive properties. However, due to the limited carrying capacity of glass for silver ions, the improvement effect of this method is general.

[0004] LECO technology is a technology that allows silver paste and silicon to form a silver-silicon alloy, which can greatly improve the filling performance of the battery. It mainly uses a probe row on the front of the battery and a copper plate on the back to make contact, thereby forming a loop and applying a reverse bias voltage. However, the positive and negative electrodes of BC batteries are designed on the back of the battery plate, so the existing LECO technology cannot be applied to BC batteries. Utility Model Content

[0005] The purpose of the utility model is to provide a tooling fixture for laser-assisted sintering of back-contact batteries to solve the problem that LECO technology in the prior art cannot be applied to BC batteries, thereby optimizing battery filling and improving battery efficiency by applying LECO technology to BC batteries.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A fixture for laser-assisted sintering of a back contact battery, comprising:

[0008] The insulating fixing member comprises a connecting portion, a main body portion and a clamping portion which are arranged on both sides of the connecting portion in a width direction, and the clamping portion and the main body portion extend along the length direction of the connecting portion;

[0009] The relationship between the thickness D of the connecting portion and the thickness D1 of the clamping portion is: D1>D; the connecting portion is provided with a through hole along the thickness direction, and the through hole extends along the length direction of the connecting portion;

[0010] A plurality of clamping members are sequentially slidably arranged on the insulating fixing member along the length direction, the clamping members include a connecting plate, a matching arm and two clamping arms, and the matching arm and the two clamping arms are arranged on both sides of the connecting plate opposite to each other;

[0011] The two clamping arms and the connecting plate are enclosed to form a clamping groove matched with the clamping portion, and the clamping groove includes a first groove section and a second groove section that are connected, the first groove section is adapted to the shape of the clamping portion, and the second groove section is adapted to the shape of the connecting portion;

[0012] The relationship between the length L1 of the clamping arm, the width L2 of the clamping portion, and the distance L3 from one side of the through hole away from the clamping portion in the width direction to the clamping portion is: L2<L1<L2+L3;

[0013] A locking member, which is arranged one-to-one with the clamping member, and is used to make the two clamping arms move closer to or farther from each other, so as to lock or unlock the relative position of the clamping member and the insulating fixing member;

[0014] A plurality of probe rows are fixed on the matching arms in a one-to-one manner and are used for contacting the battery main grid lines in a one-to-one manner;

[0015] A plurality of conducting wires are conductively connected to the probe row in a one-to-one manner and are used for electrically connecting to an external power source.

[0016] In some embodiments, the two clamping arms have a locked state in which they are close to each other and an unlocked state in which they are far away from each other. In the locked state, at least one of the clamping arms partially extends into the through hole.

[0017] In some embodiments, center lines of the connecting portion, the main body portion, and the clamping portion in the thickness direction are collinear.

[0018] In some embodiments, the relationship between the distance D3 between the sides of the two clamping arms that are away from each other and the thickness D4 of the main body is: D3 = D4.

[0019] In some embodiments, the locking member is a threaded fastener, and the two clamping arms are provided with locking holes for the threaded fastener to pass through.

[0020] In some embodiments, the probe row and the matching arm are fixed by bolts, and the matching arm is provided with an assembly hole for the bolt to pass through.

[0021] In some embodiments, the axis of the assembly hole is perpendicular to the axis of the locking hole.

[0022] In some embodiments, the probe row includes a copper plate and a plurality of probes arranged on the copper plate at intervals along a length direction, and one end of the wire is fixed on the copper plate.

[0023] In some embodiments, scale lines are formed on the main body for determining the distance between adjacent rows of probes.

[0024] In some embodiments, the insulating fixing member is made of ceramic.

[0025] Due to the application of the above technical solution, the beneficial effects of the present application compared with the prior art are:

[0026] The tooling fixture provided in the present application slides a plurality of probe rows on an insulating fixing member so that the battery main grid lines in the P region and the N region can be alternately connected to the negative and positive electrodes of the battery through corresponding probe rows and wires. This is suitable for the structure in which both the positive and negative electrodes of the BC battery are designed on the back of the battery panel, thereby realizing the application of the LECO laser-assisted sintering process to the preparation process of the back-contact battery, thereby improving the battery filling rate and battery efficiency.

[0027] At the same time, several probe rows are slidably set on the insulating fixing parts through clamps and locked in position by locking parts. This design allows the position of the probe rows to be adjusted as needed, so as to adapt to the number and layout requirements of different battery main grid lines without replacing or redesigning the tooling fixtures, thereby improving production efficiency and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of a fixture structure for laser-assisted sintering of a back contact battery in one embodiment of the utility model;

[0030] Figure 2 It is a schematic structural diagram of a clamping member in one embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 1-insulating fixing piece; 11-connecting part; 12-main body; 13-clamping part; 14-through hole; 2-clamping piece; 21-connecting plate; 22-clamping arm; 23-matching arm; 3-locking piece; 4-probe row; 41-copper plate; 42-probe; 5-conducting wire; 6-scale line; 7-clamping groove; 71-first groove section; 72-second groove section; 8-locking hole; 9-assembly hole; 10-bolt. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In this application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0036] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0037] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] See also Figure 1 and Figure 2 An embodiment of the present application provides a tooling fixture for laser-assisted sintering of back-contact batteries, including an insulating fixing member 1, a plurality of clamping members 2, a locking member 3, a plurality of probes 42 rows 4 and a plurality of wires 5.

[0040] Specifically, the insulating fixing member 1 includes a connecting portion 11, a main body 12 and a clamping portion 13 arranged on both sides of the connecting portion 11 in the width direction, and the clamping portion 13 and the main body 12 extend along the length direction of the connecting portion 11. The relationship between the thickness D of the connecting portion 11 and the thickness D1 of the clamping portion 13 is: D1>D; the connecting portion 11 is provided with a through hole 14 along the thickness direction, and the through hole 14 extends along the length direction of the connecting portion 11.

[0041] It should be noted that the width direction is Figure 1 As shown by the arrow a in the middle, the length direction is Figure 1 As shown by arrow b in the middle, the thickness direction is Figure 1 As shown by arrow c.

[0042] In some embodiments, the insulating fixture 1 is made of ceramic.

[0043] In some embodiments, scale lines 6 are formed on the main body 12 for determining the distance between adjacent rows 4 of probes 42 .

[0044] A plurality of clamping members 2 are sequentially slidably arranged on the insulating fixing member 1 along the length direction. The clamping members 2 include a connecting plate 21, a matching arm 23 and two clamping arms 22. The matching arm 23 and the two clamping arms 22 are arranged on both sides of the connecting plate 21. The two clamping arms 22 and the connecting plate 21 enclose a clamping groove 7 that matches the clamping portion 13. The clamping groove 7 includes a first groove section 71 and a second groove section 72 that are connected. The first groove section 71 is adapted to the shape of the clamping portion 13, and the second groove section 72 is adapted to the shape of the connecting portion 11. The relationship between the length L1 of the clamping arm 22, the width L2 of the clamping portion 13 and the distance L3 from one side of the through hole 14 away from the clamping portion 13 in the width direction to the clamping portion 13 is: L2<L1<L2+L3.

[0045] like Figure 1 As shown, in some embodiments, a plurality of clamping members 2 are slidably disposed on the insulating fixing member 1 along one end in the length direction.

[0046] In detail, the clamping arm 22 is arranged perpendicular to the connecting plate 21, one end of the clamping arm 22 is fixed on the connecting plate 21, and the other end is suspended. Since one end of the clamping arm 22 is suspended, when an external force is applied, the suspended end can be deformed. When the length of the clamping arm 22 is long, the deformation of the suspended end will be more significant.

[0047] In other embodiments, a plurality of clamping members 2 are slidably disposed on two insulating fixing members 1 at both ends along the length direction.

[0048] The locking member 3 and the clamping member 2 are arranged one-to-one, and the locking member 3 is used to make the two clamping arms 22 approach or move away from each other to lock or unlock the relative position of the clamping member 2 and the insulating fixing member 1. This design makes full use of the deformation characteristics of the suspension end of the clamping arm 22. Under the action of external force, the deformation of the suspension end of the clamping arm 22 can be controlled by the locking member 3 to achieve stable locking or flexible unlocking of the relative position of the clamping member 2 and the insulating fixing member 1. Such a design not only improves the reliability and safety of the clamping tool, but also enhances the adaptability and durability of the clamping tool.

[0049] In some embodiments, the two clamping arms 22 have a locked state in which they are close to each other and an unlocked state in which they are far away from each other. In the locked state, at least one of the clamping arms 22 partially extends into the through hole 14 .

[0050] In some embodiments, the center lines of the connecting portion 11 , the main body 12 , and the clamping portion 13 in the thickness direction are collinear. Thus, in the locked state, both clamping arms 22 partially extend into the through hole 14 .

[0051] In some embodiments, the relationship between the distance D3 between the sides of the two clamping arms 22 that are away from each other and the thickness D4 of the main body 12 is: D3 = D4.

[0052] In some embodiments, the locking member 3 is a threaded fastener, and the two clamping arms 22 are provided with locking holes 8 for the threaded fastener to pass through.

[0053] A plurality of rows 4 of probes 42 are fixed one-to-one on the matching arm 23 for one-to-one contact with the battery main grid line, and a plurality of wires 5 are conductively connected to the rows 4 of probes 42 in one-to-one manner for electrical connection with an external power source.

[0054] In detail, the probe 42 row 4 includes a copper plate 41 and a plurality of probes 42 arranged on the copper plate 41 at intervals along the length direction, and one end of the wire 5 is fixed on the copper plate 41 .

[0055] Since the battery main grid lines of the BC battery are staggered according to the P region and the N region, in the LECO process, the P region main grid needs to be connected to the negative pole of the external power supply, and the N region main grid is connected to the positive pole of the external power supply. When in use, several probes 42 rows 4 are alternately crimped to the P region main grid and the N region main grid, and the corresponding wires 5 are also alternately connected to the negative and positive poles of the external power supply, thereby realizing the function of providing reverse bias to the BC battery in the LECO process.

[0056] In some embodiments, the row 4 of probes 42 is fixed to the mating arm 23 by means of a bolt 10 , and the mating arm 23 is provided with an assembly hole 9 for the bolt 10 to pass through.

[0057] In some embodiments, the axis of the assembly hole 9 is perpendicular to the axis of the locking hole 8, so as to facilitate the arrangement of the plurality of probes 42 in a row 4 and reduce space occupation.

[0058] Due to the application of the above technical solution, the beneficial effects of the present application compared with the prior art are:

[0059] The tooling fixture provided in the present application slides a plurality of probe rows on an insulating fixing member so that the battery main grid lines in the P region and the N region can be alternately connected to the negative and positive electrodes of the battery through corresponding probe rows and wires. This is suitable for the structure in which both the positive and negative electrodes of the BC battery are designed on the back of the battery panel, thereby realizing the application of the LECO laser-assisted sintering process to the preparation process of the back-contact battery, thereby improving the battery filling rate and battery efficiency.

[0060] At the same time, several probe rows are slidably set on the insulating fixing parts through clamps and locked in position by locking parts. This design allows the position of the probe rows to be adjusted as needed, so as to adapt to the number and layout requirements of different battery main grid lines without replacing or redesigning the tooling fixtures, thereby improving production efficiency and reducing manufacturing costs.

[0061] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixture for laser-assisted sintering of back contact cells, characterized in that: include: The insulating fixing member comprises a connecting portion, a main body portion and a clamping portion which are arranged on both sides of the connecting portion in a width direction, and the clamping portion and the main body portion extend along the length direction of the connecting portion; The relationship between the thickness D of the connecting portion and the thickness D1 of the clamping portion is: D1>D; the connecting portion is provided with a through hole along the thickness direction, and the through hole extends along the length direction of the connecting portion; A plurality of clamping members are sequentially slidably arranged on the insulating fixing member along the length direction, the clamping members include a connecting plate, a matching arm and two clamping arms, and the matching arm and the two clamping arms are arranged on both sides of the connecting plate opposite to each other; The two clamping arms and the connecting plate are enclosed to form a clamping groove matched with the clamping portion, and the clamping groove includes a first groove section and a second groove section that are connected, the first groove section is adapted to the shape of the clamping portion, and the second groove section is adapted to the shape of the connecting portion; The relationship between the length L1 of the clamping arm, the width L2 of the clamping portion, and the distance L3 from one side of the through hole away from the clamping portion in the width direction to the clamping portion is: L2<L1<L2+L3; A locking member, which is arranged one-to-one with the clamping member, and is used to make the two clamping arms move closer to or farther from each other, so as to lock or unlock the relative position of the clamping member and the insulating fixing member; A plurality of probe rows are fixed on the matching arms in a one-to-one manner and are used for contacting the battery main grid lines in a one-to-one manner; A plurality of conducting wires are conductively connected to the probe row in a one-to-one manner and are used for electrically connecting to an external power source.

2. The fixture for laser-assisted sintering of back-contact cells according to claim 1, characterized in that: The two clamping arms have a locked state in which they are close to each other and an unlocked state in which they are far away from each other. In the locked state, at least one of the clamping arms partially extends into the through hole.

3. The fixture for laser-assisted sintering of back-contact cells according to claim 2, characterized in that: Center lines of the connecting portion, the main body portion, and the clamping portion in the thickness direction are collinear.

4. The fixture for laser-assisted sintering of back contact cells according to claim 3, characterized in that: The relationship between the distance D3 between the sides of the two clamping arms that are away from each other and the thickness D4 of the main body is: D3 = D4.

5. The fixture for laser-assisted sintering of back-contact cells according to claim 1, characterized in that: The locking piece is a threaded fastener, and the two clamping arms are provided with locking holes for the threaded fastener to pass through.

6. The fixture for laser-assisted sintering of back contact cells according to claim 5, characterized in that: The probe row and the matching arm are fixed by bolts, and the matching arm is provided with an assembly hole for the bolts to pass through.

7. The fixture for laser-assisted sintering of back contact cells according to claim 6, characterized in that: The axis of the assembly hole is perpendicular to the axis of the locking hole.

8. The fixture for laser-assisted sintering of back contact cells according to claim 6, characterized in that: The probe row comprises a copper plate and a plurality of probes arranged on the copper plate at intervals along a length direction, and one end of the wire is fixed on the copper plate.

9. The fixture for laser-assisted sintering of back contact cells according to claim 1, characterized in that: Graduation lines are formed on the main body for determining the distance between adjacent probe rows.

10. The fixture for laser-assisted sintering of back contact cells according to claim 1, characterized in that: The insulating fixing piece is made of ceramic.

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