Lithium battery module integrated with voltage sampling plate and method

Abstract

The invention discloses a lithium battery module integrated with a pressure sampling plate and a method, the module comprises a mounting plate assembly, a connecting assembly, a first battery support, the pressure sampling plate, a lithium battery and a second battery support, the first battery support and the second battery support are respectively connected with the mounting plate assembly and the pressure sampling plate through the connecting assembly; one end of the lithium battery is connected with the first battery bracket, and the other end of the lithium battery is connected with the second battery bracket. The module can be combined through a plurality of lithium battery series-parallel connection modes, so that the requirements of different capacities and voltage platforms are met, and the problem that the cylindrical lithium battery group is difficult to standardize, modularize and productize is solved. According to the lithium battery module, each cylindrical lithium battery is independently isolated, the mutual contact phenomenon does not exist, the potential safety hazards in the manufacturing, storage, transportation and use processes of the lithium battery module are reduced, and the reliability of the lithium battery module formed by the cylindrical lithium batteries is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery management, and in particular relates to a lithium battery module with an integrated pressure plate and a method. Background Art

[0002] With the continuous development of electronic technology, the demand for energy storage equipment is growing. As an efficient and environmentally friendly energy storage device, lithium batteries are widely used in various fields. At the same time, various types of high-voltage power lithium battery packs are becoming more and more widely used. However, existing lithium battery packs, especially cylindrical high-voltage lithium battery packs, have the following problems: First, there are many types of series and parallel combinations of lithium-ion battery packs, and it is difficult to achieve standardization and modularization for the design of modules, and the scalability is poor; second, high voltage also means a large number of strings of single cells. In order to achieve the charge and discharge protection and management of lithium battery packs, the corresponding number of pressure lines is large, and the welding of pressure lines, the arrangement and fixation of wire bundles are an inevitable problem; third, the use environment of lithium battery packs is becoming more and more harsh, and the structural strength of individual modules is generally not strengthened.

[0003] The patent document with announcement number CN212323147U discloses a battery module rapid equalization tool, which belongs to the field of battery module design and manufacturing. It includes a fixed bracket, which is arranged on the upper side of the battery module; the fixed bracket includes a vertical rod extending in the vertical direction and a horizontal rod extending in the horizontal direction, and the vertical rod is fixedly connected to the horizontal rod; a plurality of mounting through holes are arranged on the horizontal rod; a charge and discharge connector, which is connected to the mounting through hole of the fixed bracket, and the connection end of the charge and discharge connector is electrically connected to the busbar of the battery module. However, the device cannot freely combine and connect battery modules in series. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a lithium battery module with integrated pressure plate and method.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a lithium battery module with an integrated pressure plate, comprising a mounting plate assembly, a connecting assembly, a first battery bracket, a pressure plate, a lithium battery and a second battery bracket, wherein the first battery bracket and the second battery bracket are respectively connected to the mounting plate assembly and the pressure plate through the connecting assembly, one end of the lithium battery is connected to the first battery bracket, and the other end of the lithium battery is connected to the second battery bracket.

[0007] Preferably, the mounting plate assembly includes a first mounting plate and a second mounting plate, and the first mounting plate and the second mounting plate are both provided with a first screw, a second screw and a through hole A, and the first screw passes through the first mounting plate and the second mounting plate respectively.

[0008] Preferably, the connection assembly includes a first connection bar and a second connection bar, the first connection bar and the second connection bar are welded to the lithium battery, and the first connection bar and the second connection bar are made of pure nickel.

[0009] Preferably, the first battery holder and the second battery holder are respectively provided with mounting holes and limit blocks, the lithium battery is connected to the first battery holder and the second battery holder through the mounting holes, and the limit blocks are provided on the side of the first battery holder and the second battery holder away from the lithium battery.

[0010] Preferably, the pressure collecting plate includes a third connecting bar, a first fixing bar, a second fixing bar, a flexible printed board, a first electrical connector and a second electrical connector. The third connecting bar, the first fixing bar and the second fixing bar are respectively connected to the flexible printed board, the flexible printed board is arranged between the first fixing bar and the second fixing bar, the flexible printed board is connected to the lithium battery, the first electrical connector and the second electrical connector are connected, and the first electrical connector and the second electrical connector are arranged on the second fixing bar.

[0011] Preferably, a boss is provided on the first fixing bar, and a screw hole A is provided on the boss.

[0012] Preferably, a printed circuit and an adhesive layer are provided on the flexible printed board, the printed circuit is connected to the third connecting bar, and the flexible printed board is connected to the lithium battery through the adhesive layer.

[0013] Preferably, a groove A is provided on the first battery bracket and the second battery bracket, a through hole B is provided on the first battery bracket, and the first battery bracket and the second battery bracket are made of non-metallic material.

[0014] Preferably, the first connecting bar is in a strip shape, the second connecting bar is in a square shape, a connecting rod is arranged on the second battery bracket, the connecting rod passes through the first battery bracket, and a screw hole B is arranged on the connecting rod.

[0015] A method for using a lithium battery module with an integrated pressure plate comprises the following steps:

[0016] S1: According to the required power working conditions, determine the specifications of the cylindrical lithium batteries used, the number of lithium battery modules required, and the number of parallel and series lithium batteries in each lithium battery module;

[0017] S2: Select the first battery holder and the second battery holder corresponding to the number of mounting holes, set the pressure plate, the first mounting plate, and the second mounting plate of suitable sizes, prepare the corresponding number of lithium batteries, and place one end of the lithium battery into the mounting hole of the second battery holder according to the required series-parallel combination;

[0018] S3: Select connecting rods and place them into the gaps between the lithium batteries in a regular pattern, then buckle the first battery bracket at the other end of the lithium battery, and weld the first connecting bar and the second connecting bar to the positive and negative electrode surfaces of the lithium battery by a welding machine;

[0019] S4: Tear off the adhesive layer protective film of the mining pressure plate, fit the semicircular boss of the first fixing bar to the semicircular groove A of the first battery holder and the second battery holder to position the mining pressure plate, stick the mining pressure plate to the surface of the cylindrical lithium battery, fold the third connecting bar to the surface of the first connecting bar and the second connecting bar, weld the third connecting bar to the surface of the first connecting bar and the second connecting bar by a welding machine, and then completely tighten the first mounting plate, the second mounting plate and the connecting rod by the first screw, and then completely tighten the first mounting plate, the second mounting plate and the first fixing bar by the second screw;

[0020] S5: plug the first electrical connector with the cable welded at the tail into the second electrical connector and lock them to form a lithium battery module. Finally, connect the two lithium battery modules in series through the total positive and negative wires to obtain the final lithium battery pack.

[0021] The beneficial effects of the present invention are:

[0022] 1. This module can be combined in series and parallel with a variety of lithium batteries to meet the needs of different capacity and voltage platforms, solving the problem that cylindrical lithium batteries are difficult to standardize, modularize and commercialize.

[0023] 2. This module isolates each cylindrical lithium battery separately and prevents them from contacting each other, which reduces the potential safety hazards in the manufacture, storage, transportation and use of lithium battery modules and greatly improves the reliability of lithium battery modules formed by cylindrical lithium batteries.

[0024] 3. This module realizes the integration of the pressure sampling line through the pressure sampling plate, completely eliminating the welding operation of the pressure sampling wire, thereby avoiding the problem of fixing the pressure sampling wire bundle on the module, greatly improving the assembly efficiency of the module, and leading the pressure sampling signal to the BMS through the first electrical connector and the second electrical connector, effectively improving the efficiency of the electrical layout, and also providing convenience for later maintenance and repair.

[0025] 4. The present invention has the advantages of simple structure, convenient manufacturing, high reliability, low cost, convenient assembly and disassembly, and very strong vibration resistance, vibration absorption and buffering functions, and therefore has great promotion prospects and social needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of region A of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the pressure plate of the present invention;

[0029] Figure 4 is a schematic structural diagram of a first connecting strip of the present invention;

[0030] In the figure: 1-first screw, 101-through hole A, 2-first mounting plate, 3-first connecting bar, 4-second connecting bar, 5-a battery holder, 501-limiting block, 502-groove A, 503-through hole B, 6-pressure plate, 61-third connecting bar, 62-first fixing bar, 621-boss, 622-screw hole A, 63-second fixing bar, 64-flexible printed circuit board, 65-first electrical connector, 66-second electrical connector, 7-connecting rod, 71-screw hole B, 8-lithium battery, 9-second battery holder, 10-second mounting plate, 11-second screw. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0032] Example:

[0033] like Figures 1 to 4 As shown, a lithium battery module with an integrated pressure plate includes a mounting plate assembly, a connecting assembly, a first battery bracket 5, a pressure plate 6, a lithium battery 8 and a second battery bracket 9. The first battery bracket 5 and the second battery bracket 9 are respectively connected to the mounting plate assembly and the pressure plate 6 through the connecting assembly, one end of the lithium battery 8 is connected to the first battery bracket 5, and the other end of the lithium battery 8 is connected to the second battery bracket 9.

[0034] The mounting plate assembly includes a first mounting plate 2 and a second mounting plate 10, on which the first mounting plate 2 and the second mounting plate 10 are provided with a first screw 1, a second screw 11 and a through hole A101, and the first screw 1 passes through the first mounting plate 2 and the second mounting plate 10 respectively, so that the first screw 1 is connected to the connecting rod 7 so that the various structures of the mold are pressed by the first mounting plate 2 and the second mounting plate 10 to be connected and tightened.

[0035] The first mounting plate 2 and the second mounting plate 10 are made of non-metallic materials and also have a certain mechanical strength, so as to ensure that after the first screw 1 and the second screw 11 are tightened, no obvious marks of crushing will be left on the countersunk holes of the first mounting plate 2 and the second mounting plate 10, further ensuring the insulation between the cylindrical lithium batteries 8.

[0036] Corresponding anti-loosening measures should be taken for the first screw 1 and the second screw 11, such as using thread fasteners, silicone rubber, etc.; after the first screw 1 and the second screw 11 are tightened, they are basically kept flush with the first mounting plate 2 and the second mounting plate 10 to avoid screw protrusions causing inconvenience in subsequent installation.

[0037] The through hole A101 can reduce the weight of the structure, further improve the specific energy of the lithium battery module, and play a certain role in heat dissipation; the size of the first mounting plate 2 and the second mounting plate 10 should be larger than the outer dimensions of the first battery holder 5 and the second battery holder 9, which plays a role in protecting the structure of the first battery holder 5 and the second battery holder 9, and can reduce the possibility of damage to the first battery holder 5 and the second battery holder 9 to a certain extent.

[0038] The connection assembly includes a first connection bar 3 and a second connection bar 4, which are welded to the positive and negative surfaces of the lithium battery 8 to improve the connection reliability of the lithium battery module. The first connection bar 3 and the second connection bar 4 are made of pure nickel. The third connection bar 61 is welded to the first connection bar 3 and the second connection bar 4 by a welding machine.

[0039] The first battery holder 5 and the second battery holder 9 are provided with mounting holes and limit blocks 501, respectively. The lithium battery 8 is connected to the first battery holder 5 and the second battery holder 9 through the mounting holes. The number of mounting holes is set corresponding to the number of lithium batteries 8. Four lithium batteries 8 form a group of series batteries. The limit blocks 501 are set on the side of the first battery holder 5 and the second battery holder 9 away from the lithium battery 8. The first mounting plate 2 is set close to the limit block 501 of the first battery holder 5, and the second mounting plate 10 is set close to the limit block 501 of the second battery holder 9. Four limit blocks 501 are set around each mounting hole. After the four limit blocks are set, they will not affect the horizontal and vertical series-parallel operations of the first connecting bar 3, the second connecting bar 4, and the third connecting bar 61 therein; the limit blocks 501 should have sufficient strength so that after being tightened with the first screw 1 and the connecting rod 7, the lithium battery module should have sufficient overall structural strength and stress concentration will not occur to cause structural damage; the height of the limit blocks 501 should be more than 3 times the total height of the first connecting bar 3, the second connecting bar 4, and the third connecting bar 61 after welding.

[0040] A limiting piece is provided on one side of the mounting hole for inserting the cylindrical lithium battery 8 on the first battery holder 5 and the second battery holder 9 to prevent the cylindrical lithium battery 8 from falling from the middle after insertion. When the three are connected, the limiting pieces on the first battery holder 5 and the second battery holder 9 should face outward.

[0041] Each cylindrical lithium battery 8 has a certain gap and will not contact each other. On the one hand, it can improve the insulation performance of the lithium battery module and avoid short circuit in extreme cases. On the other hand, it can provide good heat dissipation performance for the lithium battery module and avoid thermal runaway caused by heat concentration during high-rate discharge of the cylindrical lithium battery 8, thereby improving the safety and reliability of the lithium battery module.

[0042] The pressure collecting plate 6 includes a third connecting bar 61, a first fixing bar 62, a second fixing bar 63, a flexible printed board 64, a first electrical connector 65 and a second electrical connector 66. The third connecting bar 61, the first fixing bar 62 and the second fixing bar 63 are respectively connected to the flexible printed board 64. The flexible printed board 64 is arranged between the first fixing bar 62 and the second fixing bar 63. The three can be bonded and fixed by AB glue. The flexible printed board 64 is connected to the lithium battery 8, the first electrical connector 65 and the second electrical connector 66 are connected, and the first electrical connector 65 and the second electrical connector 66 are arranged on the second fixing bar 63.

[0043] A boss 621 is provided on the first fixing bar 62, and the boss 621 is semicircular. A screw hole A622 is provided on the boss 621. The boss 621 is threadedly connected to the second screw 11 through the screw hole A622, so that the first mounting plate 2 and the second mounting plate 10 are connected and fastened to the pressure plate 6. After the connection is completed, the lithium battery module becomes a whole, which is convenient for subsequent series and parallel connection or outputting energy as a single lithium battery module.

[0044] The first fixing bar 62 is provided with a soldering pad, and the flexible printed circuit board 64 and the second fixing bar 63 are provided with corresponding through holes according to the positions of the soldering pads. Solder points are arranged around the through holes of the flexible printed circuit board 64. The outer contours of the first fixing bar 62 and the second fixing bar 63 should be basically consistent. The through holes of the second fixing bar 63 are aligned with the openings of the soldering pads of the first fixing bar 62. The soldering pins of the second electrical connector 66 pass through the through holes of the second fixing bar 63 and the flexible printed circuit board 64, and are soldered in the soldering pads of the first fixing bar 62. The soldering pins are firmly soldered to the soldering points of the flexible printed circuit board 64 and the soldering pads of the first fixing bar 62.

[0045] The number and position of the third connecting bars 61 should be set according to the number and spacing of the cylindrical lithium batteries 8 in series, and the number of the third connecting bars 61 should be one more than the number of the series battery group consisting of four lithium batteries 8. The third connecting bars 61 are welded to the first connecting bars 3 and the second connecting bars 4 to ensure firmness and reliability, and the third connecting bars 61 can be made of pure nickel material.

[0046] The flexible printed circuit board 64 is provided with a printed circuit and an adhesive layer. One end of the printed circuit is connected to the third connecting strip 61, and the other end of the printed circuit is connected to the solder joints arranged around the through-holes of the flexible printed circuit board 64. The printed circuit should have a certain overcurrent capacity. The flexible printed circuit board 64 is connected to the lithium battery 8 through the adhesive layer. The length of the flexible printed circuit board 64 should be determined according to the number of cylindrical lithium batteries 8. The length of the flexible printed circuit board 64 is greater than the length of the first battery holder 5 and the second battery holder 9, so that the adhesive layer of the flexible printed circuit board 64 is more firmly fixed. The non-welding area of ​​the third connecting strip 61 is provided with a heat shrink sleeve for insulation protection; a protective film is provided on the adhesive layer to protect the adhesive layer when it is not pasted.

[0047] The first electrical connector 65 and the second electrical connector 66 have a locking assembly, which can be mechanically fixed after plugging in to improve the reliability of the connection; the first electrical connector 65 and the second electrical connector 66 have an anti-misplugging design to avoid short circuits; the number of core points of the first electrical connector 65 and the second electrical connector 66 should be selected according to the number of battery packs in series, and dual-core connection is preferred to improve the reliability of the wiring. The tail of the first electrical connector 65 can be welded with a cable to transmit the voltage information of the lithium battery module to the BMS for charge and discharge management.

[0048] The connection between the second electrical connector 66 and the first fixing bar 62 may be a mechanical connection or an electrical connection.

[0049] Mechanical connection: The second electrical connector 66 can be threadedly connected to the hexagonal nut pre-embedded on the second electrical connector 66 by drilling a countersunk hole on the first fixing bar 62 and passing a screw through the through hole of the first fixing bar 62 .

[0050] Electrical connection: The second electrical connector 66 can be formed by adding a connector pad to the first fixing bar 62, punching a through hole C corresponding to the pad on the second fixing bar 63, and the contact of the second electrical connector 66 will pass through the through hole C and be soldered in the connector pad. Then, the flexible printed circuit board 64 is provided with an electrical connection lead-out point at the position corresponding to its pad, and finally the lead-out point of the flexible printed circuit board 64, the contact of the second electrical connector 66 and the connector pad are connected by soldering.

[0051] The first battery bracket 5 and the second battery bracket 9 are provided with a groove A502, and the first battery bracket 5 is provided with a through hole B503. The first battery bracket 5 and the second battery bracket 9 are made of non-metallic materials and have flame retardant and high temperature resistance properties. The boss 621 can fit tightly with the groove A502, thereby realizing the installation and positioning of the pressure plate 6.

[0052] The second battery support 9 is provided with a connecting rod 7, the connecting rod 7 passes through the first battery support 5 through the through hole B503, the connecting rod 7 is provided with a screw hole B71, and the connecting rod 7 is threadedly connected with the first screw 1 through the screw hole B71. The connecting rod 7 can be made of metal material to improve the overall mechanical resistance of the lithium battery module, and the connecting rod 7 should control the diameter so as not to contact the outer wall of the cylindrical lithium battery 8.

[0053] The first connecting strip 3 is in a strip shape, and the second connecting strip 4 is in a square shape.

[0054] After determining the number of lithium battery modules connected in series, the number of lithium battery modules connected in parallel can be expanded. It is only necessary to expand the sizes of the first battery holder 5, the second battery holder 9, the first mounting plate 2, and the second mounting plate 10 to increase the number of lithium battery modules connected in parallel and increase the capacity of the lithium battery modules. The lithium battery modules can be connected in series through the total positive and negative wires or the total positive and negative poles of the lithium battery modules to form a power supply with larger capacity and higher voltage for energy output.

[0055] A method for using a lithium battery module with an integrated pressure plate comprises the following steps:

[0056] S1: According to the required power working condition, determine the specifications of the cylindrical lithium battery 8 used, the number of lithium battery modules required, and the number of parallel and series connections of lithium batteries 8 in each lithium battery module. The power working condition is 2 parallel and 16 series 18650 lithium batteries, designed as 2 groups of lithium battery modules, each module is 2 parallel and 8 series, and the two lithium battery modules are connected in series to form the final lithium battery pack;

[0057] S2: Select the first battery holder 5 and the second battery holder 9 with the number of mounting holes of 2×8, set the pressure plate 6, the first mounting plate 2, and the second mounting plate 10 suitable for 8 series connection, and prepare the corresponding number of 18650 lithium batteries, and put one end of the cylindrical lithium battery 8 into the mounting hole of the second battery holder 9 in a series-parallel combination of 2 in parallel and 8 in series;

[0058] S3: Select four connecting rods 7 and place them into the gaps between the cylindrical lithium batteries 8 in a regular pattern, then buckle the first battery holder 5 at the other end of the cylindrical lithium battery 8, and weld the first connecting bar 3 and the second connecting bar 4 to the positive and negative surfaces of the cylindrical lithium battery 8 by a welding machine;

[0059] S4: Tear off the adhesive layer protective film of the mining pressure plate 6, fit the semicircular boss 621 of the first fixing strip 62 into the semicircular groove A502 of the first battery holder 5 and the second battery holder 9 to position the mining pressure plate 6, stick the mining pressure plate 6 to the surface of the cylindrical lithium battery 8, fold the third connecting strip 61 to the surface of the first connecting strip 3 and the second connecting strip 4, weld the third connecting strip 61 to the surface of the first connecting strip 3 and the second connecting strip 4 by a welding machine, and then completely tighten the first mounting plate 2, the second mounting plate 10 and the connecting rod 7 by the first screw 1, and then completely tighten the first mounting plate 2, the second mounting plate 10 and the first fixing strip 62 by the second screw 11;

[0060] S5: Plug and lock the first electrical connector 65 with the cable welded at the tail into the second electrical connector 66 to form a lithium battery module. Finally, connect the two lithium battery modules in series through the total positive and negative wires to obtain the final 2-in-parallel, 16-in-series lithium battery pack.

Claims

1. A lithium battery module with integrated pressure plate, characterized in that: The invention comprises a mounting plate assembly, a connection assembly, a first battery bracket (5), a pressure plate (6), a lithium battery (8) and a second battery bracket (9); the first battery bracket (5) and the second battery bracket (9) are respectively connected to the mounting plate assembly and the pressure plate (6) via the connection assembly; one end of the lithium battery (8) is connected to the first battery bracket (5), and the other end of the lithium battery (8) is connected to the second battery bracket (9).

2. A lithium battery module with integrated pressure plate as claimed in claim 1, characterized in that: The mounting plate assembly comprises a first mounting plate (2) and a second mounting plate (10), wherein the first mounting plate (2) and the second mounting plate (10) are both provided with a first screw (1), a second screw (11) and a through hole A (101), and the first screw (1) passes through the first mounting plate (2) and the second mounting plate (10), respectively.

3. A lithium battery module with integrated pressure plate as claimed in claim 1, characterized in that: The connection assembly comprises a first connection bar (3) and a second connection bar (4), the first connection bar (3) and the second connection bar (4) are welded to the lithium battery (8), and the first connection bar (3) and the second connection bar (4) are made of pure nickel.

4. A lithium battery module with integrated pressure plate as claimed in claim 1, characterized in that: The first battery holder (5) and the second battery holder (9) are respectively provided with mounting holes and limit blocks (501); the lithium battery (8) is connected to the first battery holder (5) and the second battery holder (9) via the mounting holes; the limit blocks (501) are provided on a side of the first battery holder (5) and the second battery holder (9) away from the lithium battery (8).

5. The lithium battery module with integrated pressure plate according to claim 1, characterized in that: The pressure collecting plate (6) comprises a third connecting bar (61), a first fixing bar (62), a second fixing bar (63), a flexible printed board (64), a first electrical connector (65) and a second electrical connector (66); the third connecting bar (61), the first fixing bar (62) and the second fixing bar (63) are respectively connected to the flexible printed board (64); the flexible printed board (64) is arranged between the first fixing bar (62) and the second fixing bar (63); the flexible printed board (64) is connected to the lithium battery (8); the first electrical connector (65) and the second electrical connector (66) are connected; the first electrical connector (65) and the second electrical connector (66) are arranged on the second fixing bar (63).

6. A lithium battery module with integrated pressure plate as claimed in claim 5, characterized in that: A boss (621) is provided on the first fixing strip (62), and a screw hole A (622) is provided on the boss (621).

7. A lithium battery module with integrated pressure plate as claimed in claim 5, characterized in that: A printed circuit and an adhesive layer are provided on the flexible printed circuit board (64); the printed circuit is connected to a third connecting bar (61); and the flexible printed circuit board (64) is connected to a lithium battery (8) via the adhesive layer.

8. The lithium battery module with integrated pressure plate according to claim 1, characterized in that: A groove A (502) is provided on the first battery bracket (5) and the second battery bracket (9), a through hole B (503) is provided on the first battery bracket (5), and the first battery bracket (5) and the second battery bracket (9) are made of non-metallic material.

9. A lithium battery module with integrated pressure plate as claimed in claim 1, characterized in that: The first connecting bar (3) is in a strip shape, the second connecting bar (4) is arranged in a square shape, a connecting rod (7) is arranged on the second battery bracket (9), the connecting rod (7) passes through the first battery bracket (5), and a screw hole B (71) is arranged on the connecting rod (7).

10. A method for using the lithium battery module with integrated pressure plate according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: According to the required power working conditions, determine the specifications of the lithium battery (8) used, the number of lithium battery modules required, and the number of lithium batteries (8) connected in parallel and in series in each lithium battery module; S2: Select a first battery holder (5) and a second battery holder (9) with corresponding numbers of mounting holes, set a pressure plate (6), a first mounting plate (2), and a second mounting plate (10) of suitable sizes, prepare a corresponding number of lithium batteries (8), and place one end of the lithium battery (8) into the mounting hole of the second battery holder (9) in a desired series-parallel combination; S3: Select a corresponding number of connecting rods (7) and place them into the gaps between the lithium batteries (8) in a regular pattern, then buckle the first battery bracket (5) on the other end of the lithium battery (8), and weld the first connecting bar (3) and the second connecting bar (4) to the positive and negative electrode surfaces of the lithium battery (8) using a welding machine; S4: tear off the adhesive layer protective film of the mining pressure plate (6), fit the semicircular boss (621) of the first fixing strip (62) into the semicircular groove A (502) of the first battery holder (5) and the second battery holder (9) to position the mining pressure plate (6), stick the mining pressure plate (6) to the surface of the lithium battery (8), fold the third connecting strip (61) to the surface of the first connecting strip (3) and the second connecting strip (4), weld the third connecting strip (61) to the surface of the first connecting strip (3) and the second connecting strip (4) by a welding machine, and then completely tighten the first mounting plate (2), the second mounting plate (10) and the connecting rod (7) by the first screw (7), and then completely tighten the first mounting plate (2), the second mounting plate (10) and the first fixing strip (62) by the second screw (11); S5: plugging and locking the first electrical connector (65) with the cable welded at the tail end with the second electrical connector (66) to form a lithium battery module, and finally connecting the two lithium battery modules in series through the total positive and total negative wires to obtain the final lithium battery pack.

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