Small-capacity multi-pole group battery structure and assembly method thereof

Abstract

The invention relates to the technical field of lead-acid storage battery assembly, in particular to a small-capacity multi-pole group battery structure and an assembly method thereof, and the assembly method comprises the following steps: step 1, assembling a plurality of single pole groups to form a multi-pole group; 2, compressing the multi-pole group to a set thickness value at the same time; thirdly, the welding plate box containing the multi-pole group is turned over, the plate lugs are made to face downwards, and the plate lugs are dipped in the scaling powder; fourthly, lead liquid is injected into a cast-weld mold, the plate lugs dipped with the scaling powder go deep into the cast-weld mold, and all busbars and connecting parts of the multi-pole group are integrally cast-welded; 5, pressing the cast-welded multi-pole group into the battery jar at the same time; 6, sealant is injected into the sealant groove of the battery cover, the battery jar with the multi-pole group is inversely bonded to the battery cover, and the battery jar and the battery cover are sealed. The qualified rate of the battery is increased, and the capacity and the service life of the battery are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of lead-acid battery assembly, and in particular to a small-capacity multi-pole group battery structure and an assembly method thereof. Background Art

[0002] In the assembly of multi-pole group batteries of lead-acid batteries, after the monopole groups are welded, multiple monopole groups are connected by through-wall welding or cross-bridge welding, that is, the positive pole of the 1# monopole group is welded together with the negative pole of the 2# monopole group, the positive pole of the 2# monopole group is welded together with the negative pole of the 3# monopole group, and so on, the 6 monopole groups are connected in series.

[0003] The prior art has the following defects: The connection between multi-pole group batteries is basically made by cross-bridge welding or through-wall welding. It is difficult to use through-wall welding for the connection between small-capacity multi-pole group batteries because the pole size is too small to meet the minimum size required for through-wall welding welding head. Therefore, most small-capacity multi-pole group batteries use cross-bridge welding, but in fact, the pole size of small-capacity multi-pole group batteries is very small, and the difficulty of cross-bridge welding is also relatively large. Compared with other metals, lead has a low melting point, and cross-bridge welding is equivalent to secondary welding. To weld the poles of two single-pole groups together, if the pole is small, the welding surface is small, and the welding torch flame is larger, it is easy to cause over-welding and lead flow; if the welding torch flame is small, it will not be welded through. For multi-pole group batteries, welding between pole groups plays an important role in the production process of lead-acid batteries. If the cross-bridge welding between the multi-pole groups of batteries is poor or poorly welded, short circuits and series connection are likely to occur, resulting in reduced battery voltage and increased scrap rate, which seriously affects battery capacity and life.

[0004] Publication number CN109244348A discloses a battery assembly process and assembly device, in which two positive pole ears and the corresponding double-layer soft connecting pieces are connected by welding, and two negative pole ears and the corresponding double-layer soft connecting pieces are connected by welding; the two double-layer soft connecting pieces are respectively connected to the two pole plates of the top cover. Although this effectively reduces the difficulty of welding, it is not suitable for connecting small-capacity multi-pole group batteries. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art, to provide a small-capacity multi-pole group battery structure and its assembly method, to improve the welding quality between multi-pole groups, to solve the problem that the cross-bridge welding poles between small-capacity pole groups are small in size, and manual welding is prone to poor welding resulting in a high battery scrap rate, thereby ensuring the battery capacity and life.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a small-capacity multi-pole group battery assembly method comprises the following steps: Step 1: Assemble multiple monopole groups to form a multipole group; Step 2: Compress the multi-electrode group to the set thickness value at the same time; Step 3: Turn over the soldering box with the multi-pole group so that the board ears face downwards and dip the board ears in flux; Step 4: Inject lead liquid into the casting and welding mold, insert the plate ears dipped in flux into the casting and welding mold, and integrally cast and weld all the busbars and connection parts of the multi-pole group; Step 5: Press the cast-welded multi-electrode group into the battery slot at the same time; Step 6: Inject sealant into the sealant groove of the battery cover, stick the battery slot with the multi-pole group upside down on the battery cover, and seal the battery slot and the battery cover.

[0007] In the step 1, a corresponding number of cells are arranged in the welding plate box corresponding to the number of monopole groups, and the monopole groups are respectively placed in the cells for assembly.

[0008] The welding plate box is divided into a plurality of cells by a baffle plate, and a through passage connecting adjacent cells is arranged on the baffle plate.

[0009] In the step 1, a corresponding number of positive plates, separators and negative plates are placed into a single grid of the welding plate box to realize the assembly of a single monopole group.

[0010] In the step 1, the monopole groups are arranged in series to form a multipole group.

[0011] In the step 4, the cast welding temperature range is 470° C.-490° C., the cast welding time range is 4s-15s, and the water cooling time range after cast welding is 10s-20s.

[0012] After the casting welding is completed in step 4, the busbars of the monopole groups of the same multipole group are arranged as follows: the positive busbar of the previous monopole group is adjacent to the negative busbar of the next monopole group.

[0013] The method also includes step seven: performing a sealing performance test. If the sealing performance test is qualified, the battery is internally formed to form a finished battery.

[0014] In the step 7, the sealing performance detection pressure is 50 kPa, and the pressure test time is 5 s. If there is no air leakage in a single cell, the sealing performance is judged to be qualified.

[0015] A small-capacity multi-pole group battery structure is applied to the above-mentioned small-capacity multi-pole group battery assembly method, comprising a battery slot and a battery cover adapted to the battery slot, wherein the inner cavity of the battery slot is divided into a plurality of single compartments by a middle grid baffle, each single compartment is provided with a single-pole group, the buses between adjacent single-pole groups are connected by a connecting part, and the battery cover is provided with a sealant groove capable of injecting sealant.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the present invention reduces the battery scrap rate caused by manual welding between pole groups, improves the battery qualification rate, and ensures the battery capacity and life. The welding equipment used in the present invention is easy to obtain, and the process operation method used is scientific, reasonable, and reliable, and the operator is easy to understand, master, and operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a finished battery of the present invention; Figure 2 This is a schematic diagram of the arrangement structure of the positive plate, negative plate and separator of the monopolar group of the present invention; Figure 3 It is a schematic diagram of the multipole group structure of the present invention.

[0018] In the figure: 1. battery slot; 2. battery cover; 3. single pole group; 4. positive plate; 5. negative plate; 6. separator; 7. bus; 8. connection part; 9. middle baffle. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Reference Figure 1-Figure 3A small-capacity multi-pole group battery structure includes a battery slot 1 and a battery cover 2 matched with the battery slot 1. The inner cavity of the battery slot 1 is divided into a plurality of single compartments by a middle grid baffle 9. A single-pole group 3 is arranged in each single compartment. The busbars 7 between adjacent single-pole groups 3 are connected by a connecting portion 8. A sealant groove for injecting sealant is arranged on the battery cover 2.

[0023] The assembly method of the above-mentioned small-capacity multi-electrode group battery structure comprises the following steps: Step 1: assembling a plurality of monopolar groups 3 to form a multi-electrode group; In the step 1, a corresponding number of positive plates 4, separators 6 and negative plates 5 are placed in a single cell of the welding plate box to realize the assembly operation of the monopolar group 3. Specifically, during the operation, a negative plate 5 (or a negative plate coated with a separator) is placed first, and then a positive plate 4 coated with a separator is placed, and so on, and finally a negative plate (or a negative plate coated with a separator) is placed.

[0024] In the step 1, a corresponding number of cells are set in the welding plate box corresponding to the number of monopole groups 3, and the monopole groups 3 are respectively placed in the cells for assembly. Further, the welding plate box is divided into a plurality of cells by a baffle plate, and a through channel connecting adjacent cells is provided on the baffle plate, so that the six monopole groups 3 formed by welding can be pressed into the battery slot 1 at the same time.

[0025] In step one, the monopole groups 3 are arranged in series to form a multipole group. In this embodiment, 6 monopole groups 3 are arranged. When arranged, the positive pole of the 1# monopole group 3 is connected to the negative pole of the 2# monopole group 3, the positive pole of the 2# monopole group 3 is connected to the negative pole of the 3# monopole group 3, and so on to the 6# monopole group 3, to complete the assembly of the multipole group. Step 2: compress the multipole group to the set thickness value; specifically, compress the multipole group to the thickness value required by the drawing through the existing special welding plate box pressing device, which is also the inner cavity length value of a single cell of the battery slot. Each product has its own welding plate box, and when it is compressed to the thickness required by the drawing, it will not be compressed further; Step 3: Turn the soldering box with the multi-pole group downward 180°, so that the board ears face downward, and dip the board ears in flux; Step 4: inject lead liquid into the casting and welding mold, insert the plate ear dipped in flux into the casting and welding mold, and integrally cast and weld all the busbars 7 and connection parts 8 of the multi-pole group; after casting and welding, the lead liquid forms the busbar 7, and at the same time, the lead liquid at the through-channel forms the connection part 8, and the adjacent busbars of the adjacent monopole groups 3 are connected based on the connection part 8. Based on the setting of the monopole groups 3 being arranged in series to form a multi-pole group in step 1 of the present application, after casting and welding, in the same multi-pole group, the busbars 7 of the monopole groups 3 are arranged as follows: the positive busbar of the previous monopole group 3 is adjacent to the negative busbar of the next monopole group 3. For example, in this embodiment, six monopole groups 3 are arranged, and the positive busbar of the 1# monopole group 3 is adjacent to the negative busbar of the 2# monopole group 3 and connected through the connection part 8, and the positive busbar of the 2# monopole group 3 is adjacent to the negative return busbar of the 3# monopole group 3 and connected through the connection part 8, and so on, to form a multi-pole group after one cast welding.

[0026] The existing conventional assembly method can only weld the positive bus and negative bus of one pole group or multiple pole groups at a time, and then put the multiple pole groups into a multi-grid battery slot, and then connect the positive bus of each grid with the negative bus of another grid through secondary welding. However, the present application welds the positive and negative bus 7 and the connection parts 8 of 6 monopole groups 3 together at the same time. The welding mold used in step 4 includes the positive and negative bus 7 and the connection parts 8 of the monopole group 3, and its size corresponds to the size of the single grid of the battery cover 2. This can ensure that the battery slot 1 and the battery cover 2 are sealed later. The position of the connection part 8 is shown in FIG. Figure 3 The thickness and width of the connection part 8 are about 4mm-10mm, and the shape is as follows: Figure 3 , or something like Figure 3 , not limited to Figure 3 The patented multi-pole group connection is formed in one step, and no secondary welding is required. There will be no secondary welding, lead flow or incomplete welding. At the same time, the equipment is cast-welded, the casting temperature and time are stable, and the welding quality is reliable.

[0027] Based on step 4, the realization is mainly reflected in the control of the cast welding process, such as cast welding temperature, cast welding time, water cooling time, etc. The cast welding temperature is controlled at 470℃-490℃, and the temperature cannot be too high or too low. Due to the small size of the plate ears and the busbar size of the small-capacity battery plate, too high cast welding temperature can easily cause the plate ears to over-melt, causing the plate to fall off. If the cast welding temperature is too low, the alloy liquid will melt unevenly, which can easily cause poor welding and incomplete welding.

[0028] The casting welding time can be adjusted according to the plate ear size and busbar size, which is about 4s-15s.

[0029] The water cooling time can be adjusted according to the position of the water cooling pipe of the casting welding mold and the size of the busbar, which is about 10s-20s. If the water cooling time is short, the inside of the busbar after casting welding is not completely cooled, and stress is easily generated during the subsequent operation, and the busbar is prone to cracks. If the water cooling time is long, the temperature of the casting welding mold is too low, and the casting welding is prone to be loose.

[0030] Step 5: Press the cast-welded multi-electrode group into the battery slot 1 at the same time; Step 6: Inject sealant into the sealant groove of the battery cover 2, and stick the battery slot 1 with the electrode group upside down on the battery cover 2 to seal the battery slot 1 and the battery cover 2.

[0031] The method also includes step seven: performing a sealing performance test. If the sealing performance test is qualified, the battery is internally formed to form a finished battery.

[0032] In the step 7, the sealing performance detection pressure is 50 kPa, and the pressure test time is 5 s. If there is no air leakage in a single cell, the sealing performance is judged to be qualified.

[0033] Sealing performance test method: Place the sealed battery in a water bath, or apply soapy water to the sealed part of the battery, and introduce compressed air through the liquid injection port 2 of the battery cover. The pressure reaches 50kPa. The test time is 5s. If no bubbles are generated in the sealed part of the battery, it means that the seal is good, the single cell is not leaking, and the sealing performance test is qualified.

[0034] The structural dimensions of the single cell and other structures of the small-capacity multi-pole group battery structure of the present application correspond to the structural dimensions of the single cell and other structures of the welded plate box.

[0035] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A method for assembling a small-capacity multi-electrode battery, characterized in that: The steps include: Step 1: Assemble multiple monopole groups (3) to form a multipole group; Step 2: Compress the multi-electrode group to the set thickness value at the same time; Step 3: Turn over the soldering box with the multi-pole group so that the board ears face downwards and dip the board ears in flux; Step 4: inject lead liquid into the casting and welding mold, insert the plate ear dipped in flux into the casting and welding mold, and integrally cast and weld all the busbars (7) and connection parts (8) of the multi-pole group; Step 5: Press the cast-welded multi-electrode group into the battery slot (1) at the same time; Step 6: Inject sealant into the sealant groove of the battery cover (2), adhere the battery slot (1) with the multi-pole group upside down on the battery cover (2), and seal the battery slot (1) and the battery cover (2).

2. A method for assembling a small-capacity multi-electrode battery group according to claim 1, characterized in that: In the step 1, a corresponding number of cells are provided in the welding plate box corresponding to the number of monopole groups (3), and the monopole groups (3) are respectively placed in the cells for assembly.

3. A method for assembling a small-capacity multi-electrode battery group according to claim 2, characterized in that: The welding plate box is divided into a plurality of cells by a baffle plate, and a through passage connecting adjacent cells is arranged on the baffle plate.

4. A method for assembling a small-capacity multi-electrode battery group according to claim 3, characterized in that: In the step 1, a corresponding number of positive plates (4), separators (6) and negative plates (5) are placed in a single cell of a welding plate box to achieve assembly of a single monopole group (3).

5. A method for assembling a small-capacity multi-electrode battery group according to claim 4, characterized in that: In the step 1, the monopole groups (3) are arranged in series to form a multipole group.

6. A method for assembling a small-capacity multi-electrode battery group according to claim 5, characterized in that: In the step 4, the cast welding temperature range is 470° C.-490° C., the cast welding time range is 4s-15s, and the water cooling time range after cast welding is 10s-20s.

7. A method for assembling a small-capacity multi-electrode battery group according to claim 6, characterized in that: After the casting welding in step 4 is completed, the busbars (7) of the monopole groups (3) of the same multipole group are arranged as follows: the positive busbar of the previous monopole group (3) is adjacent to the negative busbar of the next monopole group (3).

8. A method for assembling a small-capacity multi-electrode battery group according to claim 1, characterized in that: Also includes Step 7: Perform a sealing performance test. If the sealing performance test is qualified, the battery will be internally formed to form a finished battery.

9. A method for assembling a small-capacity multi-electrode battery group according to claim 8, characterized in that: In the step 7, the sealing performance detection pressure is 50 kPa, and the pressure test time is 5 s. If there is no air leakage in a single cell, the sealing performance is judged to be qualified.

10. A small capacity multi-electrode battery structure, characterized in that: A method for assembling a small-capacity multi-pole group battery as described in any one of claims 1 to 9, comprising a battery slot (1) and a battery cover (2) adapted to the battery slot (1), wherein the inner cavity of the battery slot (1) is divided into a plurality of single compartments by a middle baffle plate (9), each single compartment is provided with a single-pole group (3), the busbars (7) between adjacent single-pole groups (3) are connected by a connecting portion (8), and the battery cover (2) is provided with a sealant groove capable of injecting sealant.

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