A liquid-cooled double-layer cylindrical battery large module and its assembly process

Abstract

The present invention discloses a large liquid-cooled double-layer cylindrical battery module and its assembly process, including a cylindrical battery module, a water-cooling box, a PCBA acquisition board or an FPC acquisition sheet, an aluminum end plate, and a strapping tape. The cylindrical battery module is provided with two pieces, which are respectively arranged on the left and right sides of the water-cooling box in a left-right symmetrical manner. The negative end surface of each cylindrical battery in the cylindrical battery module is fixedly connected to the outer side surface of the water-cooling box through a thermal conductive structural adhesive. The PCBA acquisition board is fixedly connected to the top of the two cylindrical battery modules and is laser welded to the aluminum rows on both sides. A cooling chamber is provided in the water-cooling box, and an S-shaped coolant flow channel is provided in the cooling chamber. A liquid inlet and a liquid outlet are respectively provided on the front and rear side walls. The patent of the present invention arranges a water-cooling box in the middle of the double-layer cylindrical battery module, and the negative end surfaces of the cylindrical batteries are fixedly connected to the outer side surface of the water-cooling box. The cooling effect is good, the assembly is convenient, the production efficiency is high, the labor cost is low, and the cylindrical battery placement space is not occupied. The energy density integration of the cylindrical battery module is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a large liquid-cooled double-layer cylindrical battery module and an assembly process thereof. Background Art

[0002] With the widespread use of power batteries in electric vehicles, the industry has higher and higher requirements for the safety and energy density of electric vehicle batteries; the safety of batteries is mainly reflected in the heat dissipation of batteries, and the heat dissipation structure of cylindrical battery modules generally adopts a serpentine tube liquid cooling solution. The assembly process of the serpentine tube liquid cooling structure is more difficult because the serpentine tube needs to be insulated and its side wall needs to be affixed with a thermal conductive silicone pad to eliminate manufacturing tolerances, resulting in interference fit between the serpentine tube and the cylindrical battery, which makes it difficult to achieve automated production, resulting in low production efficiency and excessively high labor costs. Secondly, the serpentine tube occupies the placement space of the cylindrical battery, resulting in a decrease in the space utilization of the module and the energy density of the module. Summary of the invention

[0003] In order to solve the above-mentioned existing cylindrical battery module heat dissipation structure using a serpentine tube liquid cooling solution, the assembly process is relatively difficult, it is difficult to achieve automated production, which will result in low production efficiency and excessively high labor costs. Secondly, the serpentine tube occupies the placement space of the cylindrical battery, resulting in a decrease in the space utilization rate of the module, and the energy density of the module is also reduced. The present invention provides a large liquid-cooled double-layer cylindrical battery module, and a water cooling box is installed in the middle of the double-layer cylindrical battery module, so that the negative end of each cylindrical battery is in contact with the water cooling box, which has a good cooling effect, is easy to assemble, has high production efficiency, and has low labor costs. It does not occupy the placement space of the cylindrical battery, and the energy density of the cylindrical battery module is more integrated.

[0004] To achieve the above-mentioned purpose, the present invention provides a large liquid-cooled double-layer cylindrical battery module, including a cylindrical battery module, wherein the cylindrical battery module includes a lower bracket, a plurality of cylindrical batteries, an upper bracket, an aluminum row and an insulating plate, wherein the lower bracket is fixedly connected to the open end of the upper bracket, and a cylindrical battery chamber is formed inside, wherein a plurality of cylindrical battery arrays are arranged in the cylindrical battery chamber, wherein the aluminum row is fixedly connected to the outer surface of the upper bracket, and is welded to the plurality of cylindrical batteries through an aluminum welding wire, wherein the plurality of cylindrical batteries are connected in series and in parallel, and the total positive and total negative of the cylindrical battery module are led out through the front and rear sides of the aluminum row, wherein the insulating plate is arranged on the outer surface of the aluminum row, and wherein the lower bracket further includes a water cooling box, a PCBA, and a plurality of cylindrical batteries. The collecting plate or FPC collecting piece, aluminum end plate, and strapping belt are provided with two cylindrical battery modules, which are respectively symmetrically arranged on the left and right sides of the water-cooling box. The outer side surface of the lower bracket of the cylindrical battery module is fitted with the corresponding side surface of the water-cooling box. The negative end of each cylindrical battery in the cylindrical battery module passes through the cylindrical battery jack of the lower bracket, and the negative end surface is fixedly connected to the corresponding side surface of the water-cooling box. The PCBA collecting board or FPC collecting piece is fixedly connected to the top of the two cylindrical battery modules and is laser welded to the aluminum bars on both sides. The aluminum end plate is provided with two pieces, which are respectively arranged on the front and rear sides of the two cylindrical battery modules, and are fixedly connected to the middle water-cooling box through a connector;

[0005] The water-cooling box comprises a water-cooling plate and a sealing plate, wherein a cooling chamber with a left opening is provided in the water-cooling plate, an S-shaped cooling liquid flow channel is provided in the cooling chamber, the water-cooling plate is integrally formed by aluminum die-casting, the sealing plate is arranged at the left opening of the cooling chamber to seal the cooling chamber, and a liquid inlet and a liquid outlet communicating with the S-shaped cooling liquid flow channel are respectively provided on the front and rear side walls of the water-cooling plate, and the liquid inlet and the liquid outlet are connected to an external cooling water tank through a circulating pump and a water pipe to form a circulating cooling system;

[0006] The strapping straps are made of multiple automotive-grade strapping straps, which are strapped to the outside of the liquid-cooled double-layer cylindrical battery large module to fix the liquid-cooled double-layer cylindrical battery large module.

[0007] As a further improvement of the present technology, the negative end surface of the cylindrical battery is fixedly connected to the corresponding side surface of the water cooling box by means of a thermally conductive structural adhesive.

[0008] As a further improvement of the present technology, a plurality of first positioning columns are provided on the docking surface between the lower bracket and the water cooling box, and first positioning holes are provided on the water cooling box at positions corresponding to the first positioning columns, and the first positioning columns and the first positioning holes are plugged into each other.

[0009] As a further improvement of the present technology, an outer stop protruding outward is provided on the periphery of the upper edge of the connection surface between the upper bracket and the lower bracket, and an inner stop concave inward is provided on the lower bracket at a position corresponding to the outer stop, and the outer stop and the inner stop are plugged into each other to form a stop seal.

[0010] As a further improvement of the present technology, three evenly distributed first threaded holes and three evenly distributed second threaded holes are provided on the upper and lower ends of the left side surface of the water-cooling box, the first threaded holes and the second threaded holes are of the same size, the center line of the first threaded hole and the second threaded hole at the same end is arranged on the same horizontal line, and the spacing between the first threaded holes is consistent with the spacing between the second threaded holes, the first threaded holes and the second threaded holes are staggered, the first threaded hole and the second threaded hole in the middle of the water-cooling box are symmetrically arranged relative to the center line of the water-cooling box, the lower bracket is provided with a first bolt hole at a position corresponding to the first threaded hole, the upper bracket is provided with a second bolt hole at a position corresponding to the first threaded hole, the first bolt hole and the corresponding second bolt hole are penetrated by a first bolt, the end of the first bolt on the left side of the water-cooling box is threadedly connected to the first threaded hole, the left upper bracket, the cylindrical battery, the lower bracket and the water-cooling box are fixedly connected, the end of the first bolt on the right side of the water-cooling box is threadedly connected to the second threaded hole, the right upper bracket, the cylindrical battery, the lower bracket and the water-cooling box are fixedly connected.

[0011] As a further improvement of the present technology, the aluminum bars of the cylindrical battery module include a total positive aluminum bar, a plurality of series-parallel aluminum bars and a total negative aluminum bar which are connected in series from front to back. The total positive aluminum bar, the series-parallel aluminum bar and the total negative aluminum bar all connect the corresponding welded cylindrical batteries in series and / or in parallel. The total positive aluminum bar is used to lead out the total positive electrode of the cylindrical battery module, and the total negative aluminum bar is used to lead out the total negative electrode of the cylindrical battery module.

[0012] As a further improvement of the present technology, second positioning columns extending toward the insulating board are provided at the four corners on the outer side surface of the upper bracket, and second positioning holes are provided on the insulating board at positions corresponding to the second positioning columns. The second positioning columns are plugged into the second positioning holes for easy positioning; hooks extending toward the upper bracket are provided at the four corners on the inner side surface of the insulating board, and the hooks are staggered with the second positioning holes. Slots are provided on the upper bracket at positions corresponding to the four hooks, and the hooks are plugged into the corresponding slots.

[0013] As a further improvement of the present technology, the upper and lower sides of the upper bracket and the lower bracket are provided with N grooves whose width matches the width of the strapping tape, and N is a natural number greater than 1. The outer surface of the insulating plate is provided with limiting grooves at positions corresponding to the N grooves, and the strapping tape is tied in the grooves and the corresponding limiting grooves.

[0014] The present invention also provides the above-mentioned liquid-cooled double-layer cylindrical battery large module assembly process, which is characterized by comprising the following steps:

[0015] S1. Apply thermal conductive structural glue evenly on one side of the water cooling box (do not apply on the other side first);

[0016] S 2. Place the uncoated side of the water cooling box downward on the assembly platform, assemble a lower bracket with the side of the water cooling box coated with thermal conductive structural glue, and insert the three first positioning columns on the lower bracket into the corresponding first positioning holes on the water cooling box for positioning;

[0017] S3, sequentially loading a plurality of cylindrical batteries with their positive electrodes facing upward into the cylindrical battery slots of the lower bracket in step S2, and fixing the negative end surfaces of the cylindrical batteries to the water cooling box through the thermal conductive structural adhesive on the water cooling box;

[0018] S4, assembling an upper bracket and a lower bracket, plugging an outer stopper on the upper bracket and an inner stopper on the lower bracket into each other to form a stopper seal;

[0019] S5. Insert multiple first bolts through the first bolt holes of the upper bracket and the second bolt holes of the lower bracket, and lock them in the first threaded holes on the water cooling box through threaded connection to ensure that the upper bracket, the cylindrical battery, the lower bracket, and the water cooling box are fixed together;

[0020] S6. Evenly apply structural adhesive to the position where the upper bracket is assembled with aluminum bars or stick double-sided adhesive tape to the position where the upper bracket is assembled with aluminum bars, and sequentially assemble the total positive aluminum bar, multiple series-parallel aluminum bars, and the total negative aluminum bar to the upper bracket by bonding them with structural adhesive or double-sided adhesive tape;

[0021] S7. Use aluminum wire welding technology to weld cylindrical batteries in series and parallel. The positive and negative electrodes of the cylindrical batteries need to be welded on the same side.

[0022] S8. Pour foam glue into the cylindrical battery module. After the foaming, the glue needs to cover the welded aluminum wire;

[0023] S9, after the foaming glue is foamed, the insulating plate and the upper bracket are positioned through the second positioning column and the second positioning hole, and the hook and the slot are used for mortise and tenon plug-in assembly, thus completing the assembly of the cylindrical battery module on one side and the water cooling box;

[0024] S10, turn over the assembly in step S9, place it on the assembly platform with the insulating plate facing downward and the other side of the water cooling box facing upward, repeat steps S1 to S9, assemble the cylindrical battery module on the other side, and when repeating step S5, tighten the first bolts in the second threaded holes on the water cooling box;

[0025] S11. Use the grooves on the upper bracket and the lower bracket and the limit grooves on the insulating plate to tie N automotive-grade straps to the double-layer cylindrical battery module to ensure that the cylindrical battery modules on both sides are firmly fixed to the water cooling box;

[0026] S12, installing and fixing the PCBA acquisition board or FPC acquisition sheet on the top of the cylindrical battery modules on both sides assembled in step S11, and the PCBA acquisition board or FPC acquisition sheet is fixedly connected to the top of the cylindrical battery modules on both sides by multiple bolts or 3M double-sided tape;

[0027] S13, welding the aluminum rows of the cylindrical battery modules on both sides to the PCBA collection board or FPC collection sheet by laser;

[0028] S14. Install two aluminum end plates on the front side and the rear side of the water cooling box respectively.

[0029] As a further improvement of the present technology, a plurality of third threaded holes are provided on the front and rear sides of the water cooling box, and mounting holes are provided in the middle of the aluminum end plate at positions corresponding to the third threaded holes. In step S14, the aluminum end plate is fixedly connected to the water cooling box by a plurality of second bolts.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention sets a water cooling box installed in the middle of the double-layer cylindrical battery module, so that the negative terminal of each cylindrical battery is in contact with the water cooling box, and the water cooling box and the cooling water tank form a circulating cooling system, which has good cooling effect, convenient assembly, high production efficiency, low labor cost, and is suitable for mass automated production. The water cooling box does not occupy the cylindrical battery placement space, and the energy density integration of the cylindrical battery module is higher; 2. The negative terminal of the cylindrical battery of the present invention is connected to the water cooling box through a thermally conductive structural adhesive, and the thermally conductive structural adhesive It has good thermal conductivity and electrical insulation properties, and further improves the heat dissipation performance; 3. The upper bracket and the lower bracket of the present invention form a stop seal through the inner and outer stoppers, which can be waterproof and dustproof, and improve the battery safety performance; 4. The lower bracket and the water cooling box, the upper bracket and the insulating plate of the present invention are positioned and assembled through positioning columns and positioning holes, and the upper bracket, the cylindrical battery, the lower bracket and the cold water box are fixedly connected by multiple first bolts, and then the automotive-grade strapping tape is used to firmly strap the cylindrical battery modules on both sides and the water cooling box into a whole, thereby improving the earthquake resistance and anti-fall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the explosion structure of Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the internal structure of a water cooling box according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the aluminum row layout structure of Example 1 of the present invention;

[0035] Figure 5 This is a schematic diagram of the outer side structure of a bracket according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the assembly structure of the upper bracket and the insulating plate in the first embodiment of the present invention;

[0037] Figure 7 This is a structural schematic diagram of a partially enlarged view of an upper bracket according to an embodiment of the present invention;

[0038] Figure 8 This is a schematic structural diagram of a partial enlarged view of a bracket according to an embodiment of the present invention;

[0039] Fig. 9 This is a schematic diagram of the internal structure of the water cooling box according to the second embodiment of the present invention.

[0040] In the figure: 1. Cylindrical battery module, 11. Lower bracket, 111. First bolt hole, 112. Groove, 113. Inner stopper, 114. First positioning column, 115. Battery slot, 116. Third positioning column, 12. Cylindrical battery, 13. Upper bracket, 131. Slot, 132. Second positioning column, 133. Groove, 134. Second bolt hole, 135. Outer stopper, 14. First bolt, 15. Aluminum bar, 151. Total positive aluminum bar, 152. Series-parallel aluminum bar, 153. Total negative aluminum bar, 16. Insulation plate, 161. Hook, 162. Second positioning hole, 163. Limiting groove, 2. Water cooling box, 21. S-shaped coolant flow channel, 22. First positioning hole, 23. First threaded hole, 24. Second threaded hole, 25. Liquid inlet, 26. Liquid outlet, 27. Third threaded hole, 3. PCBA collection board, 4. Aluminum end plate, 41. Mounting hole, 5. Second bolt, 6. Strapping tape. DETAILED DESCRIPTION

[0041] 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.

[0042] like Figures 1 to 8As shown, the first embodiment of the present invention is a 20S30P double-layer cylindrical battery large module, including a cylindrical battery module 1, a water cooling box 2, a PCBA collection board 3, an aluminum end plate 4, and a strapping belt 6. The cylindrical battery module 1 includes a lower bracket 11, 300 cylindrical batteries 12, an upper bracket 13, an aluminum row 15 and an insulating plate 16. The lower bracket 11 is fixedly connected to the open end of the upper bracket 13 by docking, and a cylindrical battery chamber is formed inside. The 300 cylindrical batteries 12 are arranged in 12 rows in the cylindrical battery chamber, and the adjacent rows of cylindrical batteries 12 are staggered. The aluminum row 15 is fixedly connected to the outer surface of the upper bracket 13 and is welded to the 300 cylindrical batteries 12 by aluminum welding wire. A number of cylindrical batteries 12 are connected in series and in parallel, and the front and rear ends of the aluminum row 15 are connected. The total positive and negative of the cylindrical battery module 1 are led out on both sides at the back, and the insulating plate 16 is arranged on the outer surface of the aluminum row 15. The cylindrical battery module 1 is provided with two pieces, which are respectively symmetrically arranged on the left and right sides of the water-cooling box 2. The outer side surface of the lower bracket 11 of the cylindrical battery module 1 is fitted with the corresponding side surface of the water-cooling box 2. The negative end of each cylindrical battery 12 in the cylindrical battery module 1 passes through the cylindrical battery jack of the lower bracket 11, and the negative end surface is fixedly connected to the corresponding side surface of the water-cooling box 2. The PCBA acquisition board 3 is fixedly connected to the top of the two cylindrical battery modules 1 and is laser welded to the aluminum rows 15 on both sides. There are two aluminum end plates 4, which are respectively arranged on the front and rear sides of the two cylindrical battery modules 1, and are fixedly connected to the middle water-cooling box 2 through a connector;

[0043] like Figure 2 , 3 As shown, the water-cooling box 2 includes a water-cooling plate and a sealing plate. A cooling chamber with a left opening is provided in the water-cooling plate. An S-shaped coolant flow channel 21 is provided in the cooling chamber. The water-cooling plate is integrally formed by aluminum die-casting. The sealing plate is provided at the left opening of the cooling chamber to seal the cooling chamber. A liquid inlet 25 and a liquid outlet 26 communicating with the S-shaped coolant flow channel 21 are provided on the front and rear side walls of the water-cooling plate, respectively. The liquid inlet 25 and the liquid outlet 26 are connected to an external cooling water tank (not shown in the figure) through a circulating pump and a water pipe to form a circulating cooling system.

[0044] The present invention arranges a water cooling box 2 and installs it in the middle of the double-layer cylindrical battery module 1, so that the negative end of each cylindrical battery 12 is in contact with the water cooling box 2. The water cooling box 2 and the cooling water tank form a circulating cooling system with good cooling effect, convenient assembly, high production efficiency, low labor cost, and is suitable for large-scale automated production. The water cooling box 2 does not occupy the placement space of the cylindrical battery 12, thereby ensuring the energy density of the cylindrical battery module 1.

[0045] like Figure 2 As shown, the strapping strap 6 uses 4 automotive-grade strapping straps, which are strapped to the outside of the liquid-cooled double-layer cylindrical battery large module to fix the liquid-cooled double-layer cylindrical battery large module.

[0046] The negative end surface of the cylindrical battery 12 is fixedly connected to the corresponding side surface of the water cooling box 2 through a heat-conducting structural adhesive.

[0047] like Figure 3 , 5 As shown, two left-right symmetrical first positioning columns 114 are provided on the upper ends of the docking surfaces between the lower bracket 11 and the water cooling box 2, a first positioning column 114 is provided in the middle of the lower end, and first positioning holes 22 are provided at positions corresponding to the first positioning columns 114 on the water cooling box 2, and the first positioning columns 114 and the first positioning holes 22 are plugged into each other.

[0048] like Figure 7 , 8 As shown, an outer stopper 135 protruding outward is provided at the periphery of the upper edge of the connection surface between the upper bracket 13 and the lower bracket 11, and an inner stopper 113 concave inward is provided at a position corresponding to the outer stopper 135 on the lower bracket 11, and the outer stopper 135 and the inner stopper 113 are plugged into each other to form a stopper seal. The stopper seal can be waterproof and dustproof, thereby improving the safety performance of the battery.

[0049] like Figure 3 , 5 As shown in , 7, and 8, three evenly distributed first threaded holes 23 and three evenly distributed second threaded holes 24 are provided on the upper and lower ends of the left side surface of the water-cooling box 2. The first threaded holes 23 and the second threaded holes 24 are consistent in size. The center lines of the first threaded holes 23 and the second threaded holes 24 at the same end are arranged on the same horizontal line, and the hole spacing of the first threaded holes 23 is consistent with the hole spacing of the second threaded holes 24. The first threaded holes 23 and the second threaded holes 24 are staggered. The first threaded holes 23 and the second threaded holes 24 in the middle of the water-cooling box are symmetrically arranged with respect to the center line of the water-cooling box 2. The lower bracket 11 is symmetrical with the first threaded holes 23 and the second threaded holes 24. First bolt holes 111 are provided at positions corresponding to the threaded holes 23, second bolt holes 134 are provided at positions corresponding to the first threaded holes 23 on the upper bracket 13, first bolts 14 are passed through the first bolt holes 111 and the corresponding second bolt holes 134, an end of the first bolt 14 on the left side of the water-cooling box 2 is threadedly connected with the first threaded hole 23, and the left upper bracket 13, the cylindrical battery 12, the lower bracket 11 and the water-cooling box 2 are fixedly connected, and an end of the first bolt 14 on the right side of the water-cooling box 2 is threadedly connected with the second threaded hole 24, and the right upper bracket 13, the cylindrical battery 12, the lower bracket 11 and the water-cooling box 2 are fixedly connected.

[0050] The first threaded hole 23 and the second threaded hole 24 of the present invention are provided because the thickness of the water cooling box 2 is limited, and the connecting bolts of the cylindrical battery modules 1 on the left and right sides and the water cooling box 2 need to be staggered to ensure the connection strength.

[0051] like Figure 4As shown, the aluminum bars 15 of the cylindrical battery module 1 include a total positive aluminum bar 151, 9 series-parallel aluminum bars 152 and a total negative aluminum bar 153 which are connected in series from front to back. The total positive aluminum bar 151, the series-parallel aluminum bars 152 and the total negative aluminum bar 153 all connect the corresponding welded cylindrical batteries 12 in series and / or in parallel. The total positive aluminum bar 151 is used to lead out the total positive electrode of the cylindrical battery module 1, and the total negative aluminum bar 153 is used to lead out the total negative electrode of the cylindrical battery module 1.

[0052] Second positioning posts 132 extending toward the insulating plate 16 are provided at the four corners on the outer side surface of the upper bracket 13, and second positioning holes 162 are provided on the insulating plate 16 at positions corresponding to the second positioning posts 132. The second positioning posts 132 are plugged into the second positioning holes 162 for easy positioning; hooks 161 extending toward the upper bracket are provided at the four corners on the inner side surface of the insulating plate 16, and the hooks 161 are staggered with the second positioning holes 162. Slots 131 are provided on the upper bracket 13 at positions corresponding to the four hooks 161, and the hooks 161 are plugged into the corresponding slots 131.

[0053] like Figure 2 , 6 As shown in , 7 and 8, the upper and lower sides of the upper bracket 13 are provided with 4 grooves 133 whose width matches the width of the strapping belt 6 and are evenly distributed, and the upper and lower sides of the lower bracket 11 are provided with 4 grooves 112 whose width matches the width of the strapping belt 6 and are evenly distributed. The grooves 112 and 133 are consistent in size and position one by one. The outer surface of the insulating plate 16 is provided with limiting grooves 163 at positions corresponding to the four grooves 112 and 133, and the strapping belt 6 is tied in the grooves 112, 133 and the corresponding limiting grooves 163. The arrangement of the strapping belt, the grooves and the limiting grooves of the present invention can effectively prevent the movement of various components due to external vibration, and can also effectively prevent the strapping belt from being displaced and loosened, thereby improving the firmness of the strapping.

[0054] like Fig. 9 As shown, the second embodiment of the present invention is basically the same as the first embodiment, except that the S-shaped liquid flow channel in the water cooling box 2 is vertical.

[0055] The present invention also provides an assembly process of the above-mentioned embodiment 1 and embodiment 2, comprising the following steps:

[0056] S1. Apply thermal conductive structural glue evenly on one side of the water cooling box 2 (do not apply on the other side first);

[0057] S 2. Place the uncoated side of the water-cooling box 2 on the assembly platform with the side thereof facing downward, assemble a lower bracket 11 with the side of the water-cooling box 2 coated with the thermal conductive structural adhesive, and insert the three first positioning columns 114 on the lower bracket 11 into the corresponding first positioning holes 22 on the water-cooling box 2 for positioning;

[0058] S3, 300 cylindrical batteries 12 are sequentially loaded into the cylindrical battery slots 115 of the lower bracket 11 in step S2 with the positive electrodes facing upward, and the negative end surfaces of the cylindrical batteries 12 are fixedly connected to the water cooling box 2 through the thermal conductive structural adhesive on the water cooling box 2;

[0059] S4, assembling an upper bracket 13 and a lower bracket 11, plugging the outer stop 135 on the upper bracket 13 and the inner stop 113 on the lower bracket 11 into each other to form a stop seal;

[0060] S5. Insert the six first bolts 14 through the first bolt holes 134 of the upper bracket 13 and the second bolt holes 111 of the lower bracket 11, and lock them in the first threaded holes 23 on the water cooling box 2 through threaded connection to ensure that the upper bracket 13, the cylindrical battery 12, the lower bracket 11, and the water cooling box 2 are fixed together;

[0061] S6. Evenly apply structural adhesive to the position where the aluminum bar 15 is assembled on the upper bracket 13 or stick double-sided tape to the position where the aluminum bar 15 is assembled on the upper bracket 13, and sequentially assemble the total positive aluminum bar 151, the nine series-parallel aluminum bars 152 and the total negative aluminum bar 153 to the upper bracket 13 by means of structural adhesive or double-sided tape;

[0062] S7. Use aluminum wire welding technology to weld the cylindrical batteries 12 in series and in parallel. The positive and negative electrodes of the cylindrical batteries 12 need to be welded on the same side.

[0063] S8, pouring foam glue into the cylindrical battery module 1, and the foamed glue needs to cover the welded aluminum wire;

[0064] S9, after the foaming glue is foamed, the insulating plate 16 and the upper bracket 13 are positioned through the second positioning column 132 and the second positioning hole 162, and the hook 161 and the slot 131 are assembled by mortise and tenon insertion, so that the assembly of the cylindrical battery module 1 on one side and the water cooling box 2 is completed;

[0065] S10, turn over the assembly in step S9, place the insulating plate 16 downward and the other side of the water cooling box 2 upward on the assembly platform, repeat steps S1 to S9, assemble the cylindrical battery module 1 on the other side, and when repeating step S5, tighten the six first bolts 14 in the second threaded holes 24 on the water cooling box 2;

[0066] S11, four automotive-grade strapping tapes 6 are tied to the double-layer cylindrical battery module through the grooves 133 and 112 on the upper bracket 13 and the lower bracket 11 and the limiting groove 163 on the insulating plate 16 to ensure that the cylindrical battery modules 1 on both sides and the water cooling box 2 are firmly fixed;

[0067] S12, installing and fixing the PCBA acquisition board 3 on the top of the cylindrical battery modules 1 on both sides assembled in step S11, and the PCBA acquisition board 3 is fixedly connected to the top of the cylindrical battery modules 1 on both sides by multiple bolts or 3M double-sided tape;

[0068] Preferably, a third positioning column 116 is further provided on the top of the lower bracket, and a third positioning hole is provided on the PCBA acquisition board 3 at a position corresponding to the third positioning column 116. During assembly, the third positioning column 116 is plugged into the third positioning hole to facilitate positioning of the PCBA acquisition board 3;

[0069] S13, welding the aluminum bars 15 of the cylindrical battery modules 1 on both sides and the PCBA collection board 3 together by laser;

[0070] S14. Install two aluminum end plates on the front side and the rear side of the water cooling box respectively.

[0071] Preferably, four third threaded holes 27 are provided on the front and rear sides of the water cooling box 2, and mounting holes 41 are provided in the middle of the aluminum end plate 4 at positions corresponding to the third threaded holes 27. In step S14, the aluminum end plate 4 is fixedly connected to the water cooling box 2 by four second bolts 5.

[0072] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A liquid-cooled double-layer cylindrical battery large module, comprising a cylindrical battery module, the cylindrical battery module comprising a lower bracket, a plurality of cylindrical batteries, an upper bracket, an aluminum bar and an insulating plate, the lower bracket is fixedly connected to the open end of the upper bracket by docking, a cylindrical battery chamber is formed inside, a plurality of cylindrical battery arrays are arranged in the cylindrical battery chamber, the aluminum bar is fixedly connected to the outer surface of the upper bracket, and is welded to the plurality of cylindrical batteries by aluminum welding wire, the plurality of cylindrical batteries are connected in series and parallel, and the total positive and total negative of the cylindrical battery module are led out through the front and rear sides of the aluminum bar, the insulating plate is arranged on the outer surface of the aluminum bar, characterized in that It also includes a water-cooling box, a PCBA collection board or an FPC collection sheet, an aluminum end plate, and a strapping tape. The cylindrical battery module is provided with two pieces, which are symmetrically arranged on the left and right sides of the water-cooling box, respectively. The outer side surface of the lower bracket of the cylindrical battery module is fitted with the corresponding side surface of the water-cooling box. The negative end of each cylindrical battery in the cylindrical battery module passes through the cylindrical battery jack of the lower bracket, and the negative end surface is fixedly connected to the corresponding side surface of the water-cooling box. The PCBA collection board or the FPC collection sheet is fixedly connected to the top of the two cylindrical battery modules and is laser welded to the aluminum bars on both sides. The aluminum end plate is provided with two pieces, which are respectively arranged on the front and rear sides of the two cylindrical battery modules, and are fixedly connected to the middle water-cooling box through a connector; The water-cooling box comprises a water-cooling plate and a sealing plate, wherein a cooling chamber with a left opening is provided in the water-cooling plate, an S-shaped cooling liquid flow channel is provided in the cooling chamber, the water-cooling plate is integrally formed by aluminum die-casting, the sealing plate is arranged at the left opening of the cooling chamber to seal the cooling chamber, and a liquid inlet and a liquid outlet communicating with the S-shaped cooling liquid flow channel are respectively provided on the front and rear side walls of the water-cooling plate, and the liquid inlet and the liquid outlet are connected to an external cooling water tank through a circulating pump and a water pipe to form a circulating cooling system; The strapping straps are multiple automotive-grade strapping straps, which are strapped to the outside of the liquid-cooled double-layer cylindrical battery large module to fix the liquid-cooled double-layer cylindrical battery large module; The negative end surface of the cylindrical battery is fixedly connected to the corresponding side surface of the water cooling box through a thermally conductive structural adhesive; A plurality of first positioning columns are arranged on the interface between the lower bracket and the water cooling box, and first positioning holes are arranged on the water cooling box at positions corresponding to the first positioning columns, and the first positioning columns and the first positioning holes are plugged into each other; An outer stopper protruding outward is provided on the periphery of the upper edge of the connection surface between the upper bracket and the lower bracket, and an inner stopper concave inward is provided on the lower bracket at a position corresponding to the outer stopper, and the outer stopper and the inner stopper are plugged into each other to form a stopper seal; The aluminum bars of the cylindrical battery module include a total positive aluminum bar, a plurality of series-parallel aluminum bars and a total negative aluminum bar which are sequentially connected in series from front to back. The total positive aluminum bar, the series-parallel aluminum bar and the total negative aluminum bar all connect the corresponding welded cylindrical batteries in series and / or in parallel. The total positive aluminum bar is used to lead out the total positive electrode of the cylindrical battery module, and the total negative aluminum bar is used to lead out the total negative electrode of the cylindrical battery module. The upper and lower sides of the upper bracket and the lower bracket are provided with N grooves whose width matches the width of the strapping belt, wherein N is a natural number greater than 1, and the outer side surface of the insulating plate is provided with limiting grooves at positions corresponding to the N grooves, and the strapping belt is tied in the grooves and the corresponding limiting grooves; The water-cooling box is provided with three evenly distributed first threaded holes and three evenly distributed second threaded holes on the upper and lower ends of the left side surface, the first threaded holes and the second threaded holes are consistent in size, the center line of the first threaded hole and the second threaded hole at the same end is arranged on the same horizontal line, and the spacing between the first threaded holes is consistent with the spacing between the second threaded holes, the first threaded holes and the second threaded holes are staggered, and the first threaded hole and the second threaded hole in the middle of the water-cooling box are symmetrically arranged with respect to the center line of the water-cooling box. The lower bracket is provided with a first bolt hole at a position corresponding to the first threaded hole, and the upper bracket is provided with a second bolt hole at a position corresponding to the first threaded hole. The first bolt hole and the corresponding second bolt hole are penetrated by a first bolt, and the end of the first bolt on the left side of the water-cooling box is threadedly connected to the first threaded hole to fix the left upper bracket, the cylindrical battery, the lower bracket and the water-cooling box. The end of the first bolt on the right side of the water-cooling box is threadedly connected to the second threaded hole to fix the right upper bracket, the cylindrical battery, the lower bracket and the water-cooling box; Second positioning posts extending toward the insulating plate are provided at the four corners on the outer side surface of the upper bracket, and second positioning holes are provided on the insulating plate at positions corresponding to the second positioning posts. The second positioning posts are plugged into the second positioning holes for easy positioning. Hooks extending toward the upper bracket are provided at the four corners on the inner side surface of the insulating plate, and the hooks are staggered with the second positioning holes. Slots are provided on the upper bracket at positions corresponding to the four hooks, and the hooks are plugged into the corresponding slots.

2. A large module assembly process for liquid-cooled double-layer cylindrical batteries according to claim 1, characterized in that The steps include: S1. Apply thermal conductive adhesive evenly on one side of the water cooling box, but do not apply it on the other side; S 2. Place the uncoated side of the water cooling box downward on the assembly platform, assemble a lower bracket with the side of the water cooling box coated with thermal conductive structural glue, and insert the three first positioning columns on the lower bracket into the corresponding first positioning holes on the water cooling box for positioning; S3, sequentially loading a plurality of cylindrical batteries with their positive electrodes facing upward into the cylindrical battery slots of the lower bracket in step S2, and fixing the negative end surfaces of the cylindrical batteries to the water cooling box through the thermal conductive structural adhesive on the water cooling box; S4, assembling an upper bracket and a lower bracket, plugging an outer stopper on the upper bracket and an inner stopper on the lower bracket into each other to form a stopper seal; S5. Insert multiple first bolts through the first bolt holes of the upper bracket and the second bolt holes of the lower bracket, and lock them in the first threaded holes on the water cooling box through threaded connection to ensure that the upper bracket, the cylindrical battery, the lower bracket, and the water cooling box are fixed together; S6. Evenly apply structural adhesive to the position where the upper bracket is assembled with aluminum bars or stick double-sided adhesive tape to the position where the upper bracket is assembled with aluminum bars, and sequentially assemble the total positive aluminum bar, multiple series-parallel aluminum bars, and the total negative aluminum bar to the upper bracket by bonding them with structural adhesive or double-sided adhesive tape; S7. Use aluminum wire welding technology to weld cylindrical batteries in series and parallel. The positive and negative electrodes of the cylindrical batteries need to be welded on the same side. S8. Pour foam glue into the cylindrical battery module. After the foaming, the glue needs to cover the welded aluminum wire; S9, after the foaming glue is foamed, the insulating plate and the upper bracket are positioned through the second positioning column and the second positioning hole, and the hook and the slot are used for mortise and tenon plug-in assembly, thus completing the assembly of the cylindrical battery module on one side and the water cooling box; S10, turn over the assembly in step S9, place it on the assembly platform with the insulating plate facing downward and the other side of the water cooling box facing upward, repeat steps S1 to S9, assemble the cylindrical battery module on the other side, and when repeating step S5, tighten the first bolts in the second threaded holes on the water cooling box; S11. Use the grooves on the upper bracket and the lower bracket and the limit grooves on the insulating plate to tie N automotive-grade straps to the double-layer cylindrical battery module to ensure that the cylindrical battery modules on both sides are firmly fixed to the water cooling box; S12, installing and fixing the PCBA acquisition board or FPC acquisition sheet on the top of the cylindrical battery modules on both sides assembled in step S11, and the PCBA acquisition board or FPC acquisition sheet is fixedly connected to the top of the cylindrical battery modules on both sides by multiple bolts or 3M double-sided tape; S13, welding the aluminum rows of the cylindrical battery modules on both sides to the PCBA collection board or FPC collection sheet by laser; S14. Install two aluminum end plates on the front side and the rear side of the water cooling box respectively.

3. The large module assembly process of liquid-cooled double-layer cylindrical battery according to claim 2 is characterized in that: The front and rear sides of the water cooling box are provided with a plurality of third threaded holes, and the middle of the aluminum end plate and the corresponding positions of the third threaded holes are provided with mounting holes. In step S14, the aluminum end plate is fixedly connected to the water cooling box by a plurality of second bolts.

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