CN205231131U - Easy maintenance of welding lithium cell group of can connecting in parallel exempts from - Google Patents

Abstract

The utility model provides an easy maintenance of welding lithium cell group of can connecting in parallel exempts from need not spot welding and welding in the group battery manufacturing process, convenient operation, the maintenance of being convenient for. The utility model discloses a technical scheme do: an easy maintenance of welding lithium cell group of can connecting in parallel exempts from, includes a plurality of battery module and protection circuit module, end -to -end connection between the battery module, the holistic one end connect protection circuit module of battery module, battery module is sealed shell structure, internally mounted multiunit list cluster battery module, and battery module's positive pole or the negative pole of singly going here and there passes through the pole piece to be connected, and install in two sides that the casing is relative at the both ends of pole piece, and the battery module that singly goes here and there includes a plurality of cylinder battery cell, and the positive and negative pole fitting at upper and lower both ends has the support. The utility model discloses an advantage effect lies in: battery module is two independent modules with the protection circuit, and physics compresses tightly the connection, and convenient operation inspects the trouble easily.

Description

Solder-free and easy-to-maintain parallel lithium battery pack

technical field

The invention relates to a battery pack, in particular to a parallel-connectable lithium battery pack free of welding and easy to maintain.

Background technique

As the country's requirements for environmental quality are getting higher and higher, the disadvantage of lead-acid battery materials polluting the environment determines that lead-acid batteries will gradually withdraw from the market. Lithium batteries have the advantages of environmental protection and high specific energy. It is imperative to replace lead-acid batteries. Row. Lithium batteries need to add a protection circuit according to their performance requirements. The single cell needs to be spot welded, and the protection circuit needs to be welded. The manufacturing process is complicated, and after-sales maintenance is very troublesome. In addition, the previous lead-acid batteries were used in modules, and the replacement of lead-acid by lithium batteries must meet the requirements of modular use. Since lithium batteries have strict requirements on the use conditions, violation of the use standards will not only fail to achieve the ideal high performance, but will also damage the battery life and even bring safety hazards. Especially when two sets of batteries with the same nominal voltage are used in parallel, because their voltages are not exactly the same, there will be alternating charge and discharge between the batteries through the parallel line. If the voltage difference is large and the charging and discharging current is large, the battery pack will be damaged.

The patent number is: CN103326075A parallel lithium battery pack module, which consists of multiple batteries with the same nominal voltage

Lithium battery modules are connected in parallel, and each lithium battery module is formed by connecting more than two lithium batteries in series, and the series batteries in the lithium battery module are connected with voltage sampling lines, and each of the voltage sampling lines is connected in series with a recoverable A current-limiting temperature control element, and the corresponding voltage sampling lines on each equipotential series battery of each lithium battery module are connected in parallel. This method can meet the requirements of parallel use of lithium batteries, but the operation process is complex, there are many voltage acquisition wire harnesses, and the thickness and length of the wire harnesses are different, which will affect the accuracy of voltage acquisition, thereby affecting the overall performance of the battery pack. In addition, due to the need for welding When multiple restorative current-limiting temperature control elements fail, inspection and maintenance are difficult. Single strings are connected in parallel one by one, and due to the generation of balanced current, it is easy to generate pressure difference.

Contents of the invention

The purpose of the present invention is to provide a parallel-connected lithium battery pack free of welding and easy to maintain. The battery pack does not need spot welding and welding during the manufacturing process, and is easy to operate and maintain. The battery modules can be expanded in parallel without adding voltage acquisition lines, and a chip-type self-recovery fuse is added between the parallel modules to prevent excessive balanced current from damaging the battery pack. The process of parallel connection is simple and does not require welding.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a parallel-connectable lithium battery pack that is free from welding and easy to maintain, including a plurality of battery modules and protection circuit modules, the battery modules are connected end to end, and one end of the battery module is connected to the protection circuit module; the battery module is a sealed shell structure, and multiple groups of single-string battery modules are installed inside. The battery module includes a plurality of cylindrical single cells, and the positive and negative electrodes at the upper and lower ends are equipped with brackets.

According to the parallel-connectable lithium battery pack that is free from welding and easy to maintain, the two connection sides of the battery module have electrode marks, one side is distributed with a single string of electrode concave surfaces, and the other side is distributed with a single string of electrode convex surfaces, and the single string of electrode concave surfaces, single There are anti-misconnection protrusions and depressions on the convex surface of the series electrodes.

According to the welding-free and easy-to-maintain parallel lithium battery pack, the sides of the concave surface of the single-string electrode and the convex surface of the single-string electrode have matching circular protrusions and circular depressions, and the upper cover and the lower case of the battery module are connected by bolts. Connection, the electrode surfaces of the connected battery modules are in contact with each other;

The upper cover and the lower shell are equipped with series-parallel connection pieces and/or parallel connection pieces, the two ends of the series-parallel connection pieces and the parallel connection pieces are fixed on the concave surface of the single-series electrodes and the convex surface of the single-series electrodes, and the series-parallel connection pieces and the parallel connection pieces are fixed The magnetic conductor is installed, and the upper cover and the lower shell are equipped with positive pole entry limit grooves on both sides, and the outer sides of the upper cover and the lower shell are provided with asymmetrically distributed long cylinders with counterbore holes and long cylinders with threaded holes, and the sides have cooperating grooves and protrusions;

The single-string cell module is composed of a plurality of cylindrical single cells connected by the negative pole bracket and the positive pole bracket. The magnetic conductor is in close contact with the positive and negative poles of the cylindrical single battery. bit raised.

According to the parallel-connectable lithium battery pack that is free from welding and easy to maintain, four sets of single-string cell modules are installed in the battery module, and each set of single-string cell modules is distributed with 4-8 cylindrical single cells, and the upper cover is distributed There are two series-parallel connection pieces, one series-parallel connection piece is installed in the middle of the lower case, and one parallel connection piece is distributed on both sides of the series-parallel connection piece, and the magnetic conductor is fixed on the upper cover or the lower case by screws.

According to the described welding-free and easy-maintenance lithium battery pack that can be connected in parallel, each set of single-string cell modules distributes 5 cylindrical single cells.

According to the described welding-free and easy-to-maintain parallel lithium battery pack, the protective circuit module includes a protective plate shell, a protective plate cover, and a protective plate, and one side of the protective circuit module is provided with a positive electrode discharge pole, a negative pole discharge pole, Discharge positive and negative signs, the protection board shell has a circular protrusion that cooperates with the battery module, the protection circuit module is fixed on the battery module by screws, and the voltage collection protrusion of the protection circuit module contacts the concave surface of the single string electrode.

According to the parallel-connected lithium battery pack that is free from welding and easy to maintain, the voltage acquisition protrusion is connected to the corresponding fixing seat inside the protective plate shell, the positive discharge electrode column and the negative electrode discharge electrode column are connected to the discharge end of the protective plate, and the protective plate shell is connected to the protective plate shell. The board cover is screwed, and the screw plug fits into the small counterbore.

According to the welding-free and easy-to-maintain parallel lithium battery pack, the concave surface of the single-string electrode of the battery module is also equipped with a press-type self-restoring fuse, and the convex surface of the single-string electrode of the adjacent battery module is pressed on the self-recovery fuse through screw connection. Restore the fuse above.

The advantages and effects of the present invention are that: the battery module and the protection circuit are two independent modules, which are physically pressed and connected, easy to operate, and easy to check for faults. The single cell is fixed by the bracket, no spot welding is required for series and parallel connection, no welding is required for the protection circuit, and all circuit connections are all connected by physical compression, which is easy to operate, high in production efficiency, and easy to maintain. Each operation step is equipped with an anti-reverse connection structure, which has high safety performance. The battery modules are connected in parallel, which is simple and easy to operate, and effectively prevents the pressure difference between the strings.

Description of drawings

Figure 1 is a structural schematic diagram of a parallel-connectable lithium battery pack that is free of welding and easy to maintain.

Figure 2 is a schematic diagram 2 of the structure of a parallel-connectable lithium battery pack free of welding and easy to maintain.

Fig. 3 is a schematic diagram of an exploded structure of a parallel-connectable lithium battery pack free of welding and easy to maintain.

FIG. 4 is a structural schematic diagram of a battery module.

FIG. 5 is a second schematic diagram of the structure of the battery module.

FIG. 6 is a first schematic diagram of an exploded structure of a battery module.

FIG. 7 is a second schematic diagram of an exploded structure of a battery module.

Fig. 8 is a schematic diagram of the structure of the upper cover to fix the magnetic conductor.

FIG. 9 is a first schematic diagram of the structure of the upper cover.

Figure 10 is a schematic diagram of the structure of the upper cover II.

Fig. 11 is a schematic diagram of the structure of the fixed magnetic conductor in the lower case.

Figure 12 is a schematic diagram of the lower shell structure.

Figure 13 is the second schematic diagram of the lower shell structure.

Fig. 14 is a schematic diagram of the structure of the series-parallel connection piece.

Figure 15 is a schematic diagram of the structure of the parallel connecting piece.

Fig. 16 is a schematic diagram of the structure of the magnetic conductor.

Fig. 17 is a schematic diagram of the structure of a single-string cell module.

Fig. 18 is a schematic diagram of the structure of the positive pole support.

FIG. 19 is a first schematic diagram of the appearance and structure of the protection circuit module.

FIG. 20 is a second schematic diagram of the appearance and structure of the protection circuit module.

Fig. 21 is a schematic diagram of the internal circuit connection structure of the protection circuit module.

Fig. 22 is a schematic diagram of the internal structure of the protective board shell.

Fig. 23 is a schematic diagram of the external structure of the protective board shell.

Fig. 24 is a schematic diagram of the structure of the outer cover of the protective plate.

Fig. 25 is a schematic diagram of the structure of the protection board.

Fig. 26 is a schematic diagram of an exploded structure of a battery pack of parallel battery modules.

In the attached drawings: 1. Battery module, 2. Protection circuit module, 3. Concave surface of a single string of electrodes, 4. Convex surface of a single string of electrodes, 5. Electrode logo, 6. Round protrusion, 7. Round depression, 8. Shen Hole, 9. Threaded hole, 10. Upper cover, 11. Lower shell, 12. Magnetic conductor, 13. Single string cell module, 14. Series and parallel connecting piece, 15. Positive electrode entry limit slot, 16. Belt Counterbore long cylinder, 17. Square groove, 18. Parallel connecting piece, 19. Threaded hole long cylinder, 20. Square protrusion, 21. Conductor fixed threaded hole, 22. Tapered hole, 23. Negative pole support, 24. Positive pole bracket, 25. Positioning groove of magnetic conductor, 26. Limiting protrusion, 27. Protective plate shell, 28. Protective plate outer cover, 29. Screw plug, 30. Positive discharge pole, 31. Negative discharge pole, 32. Discharge positive and negative signs, 33. Voltage collection protrusion, 34. Protection board, 35. Copper connector, 36. B-fixing seat, 37. B1 fixing seat, 38. B2 fixing seat, 39. B3 fixing seat , 40.B+ fixing seat, 41.P+ fixing seat, 42.P-fixing seat, 43. Protection plate fixing column, 44. Outer cover fixing column, 45. Small counterbore, 46.B-line, 47.P- Line, 48. Voltage acquisition line group, 49. Through hole, 50. Press-type resettable fuse.

detailed description

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

As shown in Figures 1 to 26 of the present invention, a welding-free and easy-to-maintain parallel lithium battery pack includes a battery module 1 and a protection circuit module 2, and the battery modules 1 are connected end to end to form a parallel connection. There is no need for spot welding between the battery modules 1, and no welding for the protection module 2, and the two are connected by screw compression. This connection method is convenient for maintenance and can realize parallel connection without welding to increase capacity.

As shown in Figure 2, in this implementation, the battery module 1 has a single string of electrode concave surfaces 3 on one side, and a single string of electrode convex surfaces 4 on the other opposite side.

As shown in Figure 4-5, in this implementation, there are electrode marks 5 on both sides of the battery module 1 for easy identification. In this implementation, there is a circular depression 7 on one side of the single-string electrode concave surface 3 of the battery module 1, and a matching circular protrusion 6 on the side of the single-string electrode convex surface 4. The two cooperate with each other to prevent the battery from There is a danger of reverse connection when modules 1 are connected in parallel.

As shown in Figure 8-9, in this implementation, there are countersunk holes 8 at the four corners of the inner side of the battery module 1, and threaded holes 9 at the four corners of the inner side of the other side, which are threaded holes for locknuts. The hole 8 is screwed into the threaded hole 9 to realize the parallel connection of the battery modules 1, and the electrode surfaces of the two sets of battery modules 1 are pressed and contacted to realize the parallel connection.

In this implementation, the battery module 1 includes an upper cover 10 and a lower case 11. The magnetic conductive body 12 is in contact with the positive and negative poles of the single-string battery module 13, and the magnetic plus physical pressure contact realizes the series-parallel connection inside the battery module 1 .

The upper cover 10 fixes two series-parallel connection pieces 14 therein by injection molding, and the pole pieces at both ends form electrode concave surfaces and electrode convex surfaces, and the magnetic conductor 12 is fixed on the series-parallel connection pieces 14 through screw connection. Both sides of the upper cover 10 are provided with positive electrode casing limit grooves 15, and there are two long cylinders 16 with countersunk holes on both sides of the outside, which are eccentrically distributed, and square grooves 17 are provided on the four sides above.

The lower shell 11 fixes the two parallel connection pieces 18 and the series-parallel connection pieces 14 on both sides by injection molding, and the two ends form the electrode concave surface and the electrode convex surface, and the magnetic conductor 12 is fixed on the series-parallel connection piece 14 and the parallel connection piece through screw connection. 18 on. In this implementation, both sides of the lower shell 11 are provided with a positive electrode casing limit groove 15, and there are two long cylinders 19 with threaded holes on both sides of the exterior. The threaded holes are threaded holes for locknuts and are distributed eccentrically. from 20.

In this implementation, the long cylinder 16 with a counterbore hole cooperates with the long cylinder 19 with a threaded hole, and the upper cover 10 and the lower shell 11 are fixed together by screwing in screws and elastic washers. The screw positions are asymmetrically distributed to prevent assembly errors. In this implementation, the square groove 17 cooperates with the square protrusion 20 to make the upper cover 10 and the lower shell 11 closely fit to prevent skewing.

As shown in Figures 8 and 11, the distance between the fixed threaded holes 21 and the tapered holes 22 on the magnetic conductor 12 on the series-parallel connection piece 14 and the parallel connection piece 18 is the same, so as to realize the magnetic conduction with countersunk screws. The fluid 12 is fixed on the series-parallel connection piece 14 or the parallel connection piece 18 .

In this implementation, the single-string cell module 13 combines the cylindrical single battery through the negative pole support 23 and the positive pole support 24. The negative electrode is in close contact. Wherein, the two ends of the positive pole support 24 are provided with limit protrusions 26 to cooperate with the positive pole entry limit grooves 15, so as to prevent errors of wrong installation or reverse rotation of the single string battery module 13 when entering the shell.

As shown in FIG. 19 , the protection circuit module 2 is composed of a protection board shell 27 and a protection board cover 28 , and is provided with a positive discharge electrode post 30 and a negative discharge electrode post 31 , and a discharge positive and negative sign 32 is marked near the pole posts. The threaded hole 9 on it and the counterbore 8 on the battery module 1 are tightened by screws and elastic pads to ensure that the voltage collection protrusion 33 of the protection module 2 is closely connected with the single-string electrode concave surface 3 of the battery module 1, and the circular shape distributed on one side The protrusion 6 cooperates with the circular recess 7 on the battery module 1 to prevent reverse connection.

In this implementation, the B-mount 36 , B1 mount 37 , B2 mount 38 , B3 mount 39 , and B+ mount 40 are provided inside the protective plate shell 27 to connect with four groups of single-string cell modules 13 pole pieces. Each fixing seat is provided with a threading hole and a crimping screw hole, and the copper connector 35 connects the B+ fixing seat 40 and the P+ fixing seat 41 together. In this implementation, the B-fixed seat 36 , the B1 fixed seat 37 , the B2 fixed seat 38 , the B3 fixed seat 39 , and the B+ fixed seat 40 all have voltage collecting protrusions 33 . The P+ fixing seat 41 is integrated with the positive discharge electrode post 30 , and the P− fixing seat 42 is integrated with the negative discharge electrode post 31 .

In this implementation, the protection plate 34 contains B-line 46, P-line 47 and voltage collection line group 48. After each line is stripped, it is inserted into the threading hole on the corresponding fixing seat, and is pressed with screws and elastic flat pads. The holes 49 are used to fix the fender 34 inside the fender housing 27 .

In this implementation, the four corners of the protective plate outer cover 28 distribute small counterbore holes 45 to cooperate with the outer cover fixing columns 44, and the protective plate shell 27 and the protective plate outer cover 28 are fixed together by self-tapping screws. Cooperate, cover the self-tapping screw inside the small counterbore 45.

In this implementation, when lithium battery packs are connected in parallel, the press-type self-recovery fuse 50 is located on the concave surface 3 of the single-string electrodes, and the convex surface 4 of the single-string electrodes of the battery module 1 to be incorporated is pressed tightly on it to make contact with it. The self-recovery fuse 50 can prevent the battery pack from being damaged due to a large equalizing current due to excessive voltage difference during the parallel connection process, and the capacity of each string of batteries is increased at the same time, avoiding the voltage difference caused by equalizing charge and discharge.

Claims (8)

1. A lithium battery pack that can be connected in parallel without welding and easy to maintain, characterized in that it includes multiple battery modules (1) and protection circuit modules (2), the battery modules (1) are connected end to end, and the battery modules (1) as a whole One end of the battery module (2) is connected to the protection circuit module (2); the battery module (1) is a sealed shell structure, and multiple sets of single-string battery modules (13) are installed inside, and the positive or negative poles of the single-string battery modules (13) are connected through pole pieces. The two ends of the pole piece are installed on the two opposite sides of the casing, and the single-string battery module (13) includes a plurality of cylindrical single batteries, and the positive and negative electrodes at the upper and lower ends are equipped with brackets. 2. The welding-free and easy-to-maintain parallel lithium battery pack according to claim 1, characterized in that: the battery module (1) has electrode marks (5) on both connection sides, and one side is distributed with a single string of electrode concave surfaces (3), the other side is distributed with a single-string electrode convex surface (4), the single-string electrode concave surface (3), and the single-string electrode convex surface (4) are provided with anti-misconnection protrusions and depressions. 3. The welding-free and easy-to-maintain parallel lithium battery pack according to claim 2, characterized in that: the sides of the single-string electrode concave surface (3) and the single-string electrode convex surface (4) have matching circular protrusions (6) and the circular depression (7), the upper cover (10) and the lower case (11) of the battery module (1) are connected by bolts, and the electrode surfaces of the connected battery modules (1) are in contact with each other; The upper cover (10) and the lower shell (11) are provided with series-parallel connecting pieces (14) and/or parallel connecting pieces (18), and the two ends of the series-parallel connecting pieces (14) and the parallel connecting pieces (18) are fixed on the single On the concave surface of the series electrode (3) and the convex surface of the single-series electrode (4), the series-parallel connection piece (14) and the parallel connection piece (18) are equipped with a magnetic conductor (12), an upper cover (10), and a lower case (11) Both sides of the interior are provided with positive electrode casing limit grooves (15), and the outer sides of the upper cover (10) and the lower casing (11) are provided with asymmetrically distributed long cylinders (16) with countersunk holes and long cylinders with threaded holes (19) , with matching grooves and protrusions on the sides; The single-string cell module (13) is composed of a plurality of cylindrical single cells connected by the negative pole support (23) and the positive pole support (24). The magnetic conductor (12) is in close contact with the positive and negative poles of the cylindrical single battery, and the positive pole support ( 24) There are limit protrusions (26) at both ends that cooperate with the positive electrode casing limit groove (15). 4. The welding-free and easy-to-maintain parallel lithium battery pack according to claim 3, characterized in that four sets of single-string cell modules (13) are installed in the battery module (1), and each set of single-string cell modules The module (13) distributes 4-8 cylindrical single cells, two series-parallel connecting pieces (14) are distributed on the upper cover (10), and a series-parallel connecting piece (14) is installed in the middle of the lower case (11) for series-parallel connection A parallel connecting piece (18) is distributed on both sides of the piece (14), and the magnetic conductor (12) is fixed on the upper cover (10) or the lower shell (11) by screws. 5. The welding-free and easy-to-maintain parallel lithium battery pack according to claim 4, characterized in that: each group of single-string cell modules (13) is distributed with 5 cylindrical single cells. 6. The welding-free and easy-to-maintain parallel lithium battery pack according to claim 1, characterized in that: the protection circuit module (2) includes a protection board shell (27), a protection board cover (28), a protection board (34), one side of the protection circuit module (2) is provided with a positive discharge electrode post (30), a negative discharge electrode post (31), a discharge positive and negative sign (32), and the protective plate shell (27) has a battery module (1) The circular protrusions (6) that cooperate with each other, the protection circuit module (2) is fixed on the battery module (1) by screws, the voltage collection protrusions (33) of the protection circuit module (2) and the concave surface of the single string electrode (3) CONTACT. 7. The welding-free and easy-to-maintain parallel lithium battery pack according to claim 6, characterized in that: the voltage acquisition protrusion (33) is connected to the corresponding fixing seat inside the protective plate shell (27), and the positive electrode discharge pole (30 ), the negative discharge electrode column (31) is connected with the discharge end of the protective plate (34), the protective plate shell (27) is screwed with the protective plate outer cover (28), and the screw plug (29) cooperates with the small counterbore (45). 8. The welding-free and easy-to-maintain parallel lithium battery pack according to claim 7, characterized in that: the single-string electrode concave surface (3) of the battery module (1) is also equipped with a chip-type resettable fuse ( 50), the single-string electrode convex surface (4) of the adjacent battery module (1) is pressed on the resettable fuse (50) through screw connection.