Battery pack module with high-efficiency liquid cooling heat dissipation structure

Abstract

The application provides a battery pack module with high-efficiency liquid cooling heat dissipation structure, which comprises a water cooling plate and a battery cell group, the battery cell group comprises at least two battery cells, the negative poles of the battery cells are all arranged downward, at least part of the shell of the lower end of the battery cells is exposed, the water cooling plate is provided with a battery cell mounting groove, the negative pole of the battery cell is attached to the groove bottom of the battery cell mounting groove of the water cooling plate, the battery cell mounting groove is provided with heat-conducting glue, the heat-conducting glue is wrapped around the exposed shell part of the battery cell, the heat-conducting glue is solidified with the water cooling plate and the battery cell into an integrated whole, the battery cell mounting groove of the water cooling plate is provided with a water cooling boss, and the water cooling boss is located in the gap formed between adjacent battery cells. The application has the advantages of simplifying the manufacturing process, being low in cost, being suitable for application of small and medium-sized battery pack modules, such as electric motorcycle batteries, and improving the heat dissipation efficiency.

Description

Technical Field

[0001] This invention relates to battery pack modules, and more particularly to a battery pack module with a high-efficiency liquid cooling structure. Background Technology

[0002] Currently, many working conditions require electric motorcycles that can charge and discharge quickly (with high charging and discharging rates) to meet usage needs. For example, high-speed electric motorcycles used in competitions, mountain bikes, beach four-wheel drive electric motorcycles, and some special environmental conditions such as food delivery and express delivery require frequent use and rapid charging and discharging of electric vehicles. This necessitates battery pack modules with high charging and discharging rates. The safety and heat dissipation performance of high-power charging and discharging battery pack modules are therefore particularly important.

[0003] Currently, Tesla's existing cylindrical battery system uses structural thermally conductive adhesive to bond numerous cells to a serpentine harmonica tube, utilizing the harmonica tube for heat exchange. The heat exchange area is only 1 / 6 of the cell's side area, and its drawbacks are as follows: 1. The manufacturing process is complex and the cost is high; 2. Suitable for large battery pack modules, but not suitable for medium and small battery pack modules (such as electric motorcycle batteries); 3. Small heat exchange area (1 / 6 of the side area). Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a battery pack module with a high-efficiency liquid cooling heat dissipation structure.

[0005] This invention provides a battery pack module with a high-efficiency liquid cooling structure, including a water-cooling plate and a cell assembly. The cell assembly includes at least two cells, with the negative terminals of all cells facing downwards. At least a portion of the lower end of each cell's casing is exposed. The water-cooling plate has a cell mounting groove, and the negative terminal of each cell is attached to the bottom of the groove. Thermally conductive adhesive is present within the cell mounting groove, wrapping around the exposed casing portion of the cell. The thermally conductive adhesive is in contact with the... The water-cooled plate and the battery cell are solidified into one piece. The battery cell mounting groove of the water-cooled plate is provided with a water-cooled boss. The water-cooled boss is located in the gap formed between adjacent battery cells and is attached to the side of the adjacent battery cell. The water-cooled plate has a serpentine water channel inside. The serpentine water channel includes a main water channel and a water-cooled boss water channel connected to the main water channel. The main water channel is arranged along the plane of the water-cooled plate, and the water-cooled boss water channel is located inside the water-cooled boss and is arranged along the outer contour of the water-cooled boss.

[0006] As a further improvement of the present invention, the side of the water-cooled boss is provided with an arc surface that fits against the battery cell.

[0007] As a further improvement of the present invention, the thermally conductive adhesive covers the water-cooled boss.

[0008] As a further improvement of the present invention, the water-cooled boss includes a boss shell and a boss core with matching shapes, and there is a hollow structure between the boss shell and the boss core that constitutes the water channel of the water-cooled boss.

[0009] As a further improvement of the present invention, the arc surface has three parts distributed circumferentially at 120° intervals around the water-cooled boss.

[0010] As a further improvement of the present invention, the water-cooled boss water channel passes through each of the arc surfaces.

[0011] As a further improvement of the present invention, the battery cell is a cylindrical battery cell, and each cylindrical battery cell has six water-cooled bosses distributed circumferentially.

[0012] As a further improvement of the present invention, a gap is provided between the lower end face of the battery cell and the bottom of the battery cell mounting groove.

[0013] As a further improvement of the present invention, the gap is filled with thermally conductive adhesive.

[0014] As a further improvement of the present invention, the height of the gap is between 1 mm and 2 mm.

[0015] As a further improvement of the present invention, the water-cooled plate includes a base plate and side plates disposed around the base plate, the side plates and the base plate forming the cell mounting groove.

[0016] As a further improvement of the present invention, the base plate is provided with a cell venting and pressure relief hole, which is located at the bottom of the cell.

[0017] As a further improvement of the present invention, the inner and outer surfaces of the water-cooled plate are coated with insulating varnish.

[0018] As a further improvement of the present invention, the battery pack module further includes a plastic bracket, a busbar, and a flexible FPC for data acquisition. The plastic bracket is installed on the top of the battery cell assembly. The flexible FPC for data acquisition and the busbar are respectively installed on the plastic bracket. The busbar is divided into positive and negative groups, which are respectively connected to the positive and negative terminals of the battery cells through electrical connection devices. The flexible FPC for data acquisition is connected to the busbar to acquire voltage data and temperature for each string.

[0019] As a further improvement of the present invention, the outer side of the plastic bracket and the outer side of the water-cooling plate are respectively provided with alignment protrusions for assembly and alignment, and the alignment protrusions are provided with semi-circular grooves.

[0020] As a further improvement of the present invention, the plastic bracket and the water-cooled plate are respectively provided with upper and lower interlocking fixed positioning posts, and the upper and lower interlocking fixed positioning posts are the cooperation between the positioning hole and the positioning post.

[0021] As a further improvement of the present invention, the plastic bracket and the fixing positioning post on the water-cooling plate are provided with through holes, and there are at least two battery pack modules stacked one on top of the other. The stacked battery pack modules are fixed by fixing rods passing through the through holes of the fixing positioning post on the plastic bracket and the water-cooling plate.

[0022] As a further improvement of the present invention, the plastic bracket is provided with grooves to accommodate the busbar and the flexible FPC for data acquisition. The busbar and the flexible FPC for data acquisition are fixed to the grooves of the plastic bracket by adhesive. The flexible FPC for data acquisition is located on the side of the plastic bracket, the busbar is located on the top surface of the plastic bracket, and the positive terminals of all the cells of the battery pack face upwards and are bonded to the plastic bracket as a whole by adhesive.

[0023] The beneficial effects of the present invention are: the above solution simplifies the manufacturing process, reduces costs, and is applicable to small and medium-sized battery pack modules, such as electric motorcycle batteries, thereby improving heat dissipation efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other solutions can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is an exploded view of a battery pack module with a high-efficiency liquid cooling structure according to the present invention.

[0026] Figure 2 This is a three-dimensional schematic diagram of a battery pack module with a high-efficiency liquid cooling structure according to the present invention.

[0027] Figure 3 This is a side view of a battery pack module with a high-efficiency liquid cooling structure according to the present invention.

[0028] Figure 4 This is a schematic diagram of the assembly of the water cooling plate and the battery cell of a battery pack module with a high-efficiency liquid cooling heat dissipation structure according to the present invention.

[0029] Figure 5 yes Figure 4 AA, the cross-sectional view.

[0030] Figure 6This is a three-dimensional schematic diagram of a water-cooled plate for a battery pack module with a high-efficiency liquid cooling structure according to the present invention.

[0031] Figure 7 This is a top view of the water-cooled plate of a battery pack module with a high-efficiency liquid cooling structure according to the present invention.

[0032] Figure 8 yes Figure 7 BB is a cross-sectional view.

[0033] Figure 9 This is a schematic diagram of the water-cooling plate and thermally conductive adhesive of a battery pack module with a high-efficiency liquid cooling heat dissipation structure according to the present invention.

[0034] Figure 10 This is a multi-layer stacked extended structure diagram of a battery pack module with a high-efficiency liquid cooling heat dissipation structure according to the present invention.

[0035] Figure 11 This is an exploded view of the thermal management module of a battery pack module according to the present invention.

[0036] Figure 12 This is an overall assembly diagram of a multi-layer stacked extension of a battery pack module with a high-efficiency liquid cooling heat dissipation structure according to the present invention. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] like Figures 1 to 12 As shown, a battery pack module 100 with a high-efficiency liquid cooling structure includes a water-cooling plate 1 and a cell assembly. The cell assembly includes at least two cells 3, with the negative electrode 31 of each cell 3 facing downwards. At least a portion of the casing (generally a metal casing, such as a steel casing) is exposed at the bottom of the cell 3. The water-cooling plate 1 has a cell mounting groove 15. The negative electrode 31 of the cell 3 is attached to the bottom of the cell mounting groove 15 on the water-cooling plate 1. Thermally conductive adhesive 2 is placed inside the cell mounting groove 15, covering the exposed casing portion of the cell 3. The thermally conductive adhesive 2, the water-cooling plate 1, and the cell 3 are solidified into a single unit, i.e., a water-cooling assembly 30. By encapsulating the high-efficiency thermally conductive adhesive 2 with the bottom water-cooling plate 1, the module heats and cools the cell 3 through mutual heat exchange between the exposed casing at the bottom of the cell and the water-cooling plate 1 during charging and discharging. This protects the cell and ensures the cycle life of the module. This design also achieves consistent heat dissipation on the surface of the battery cell, resulting in a small temperature difference between the cells. It also enables thermal conductivity and insulation, ultimately leading to excellent heat dissipation and thermal balance.

[0042] The water-cooled plate 1 has a water-cooled boss 11 on the cell mounting groove 15. The water-cooled boss 11 is located in the gap formed between adjacent cells 3, and the water-cooled boss 3 is attached to the side of the adjacent cell 3.

[0043] The water-cooled plate 1 has a serpentine water channel 10 inside. The serpentine water channel 10 includes a main water channel 103 and a water-cooled boss water channel 104 connected to the main water channel 103. The main water channel 103 is arranged along the plane of the water-cooled plate 1, and the water-cooled boss water channel 104 is located inside the water-cooled boss 11 and is arranged along the outer contour of the water-cooled boss 11.

[0044] The thermally conductive adhesive 2 covers the water-cooled boss 11, that is, the thermally conductive adhesive 2 is higher than the water-cooled boss 11, and the water-cooled boss 11 is completely wrapped in the thermally conductive adhesive 2.

[0045] The water-cooled boss 11 includes a boss shell 1101 and a boss inner core 1102 with matching shapes, and there is a hollow structure between the boss shell 1101 and the boss inner core 1101 that forms the water channel 104 of the water-cooled boss.

[0046] The main waterway 103 is connected to an inlet 101 and an outlet 102.

[0047] The side of the water-cooled boss 11 is provided with an arc surface 111 that fits into the battery cell 3.

[0048] The arc surface 111 has three parts that are distributed circumferentially at 120° intervals around the water-cooled boss 11.

[0049] The water-cooled boss water channel 104 passes through each of the arc surfaces 111.

[0050] The battery cell 3 is a cylindrical battery cell, and each cylindrical battery cell has six water-cooled bosses 11 distributed circumferentially.

[0051] The water-cooled boss 11 is triangular in shape.

[0052] The water channel, via the water-cooled protrusion 11, increases the contact area during heat transfer, thereby improving heat dissipation. The minimum heat exchange area between the water-cooled plate 1 and the battery cell 3 is the entire bottom surface of the battery cell 3 plus the six raised sides (i.e., the perimeter of the battery cell side multiplied by 180° and the height of the protrusion). Taking the 4680 battery cell as an example, the heat exchange area of ​​this invention is 60% larger than that of Tesla technology.

[0053] A gap is provided between the lower end face of the battery cell 3 and the bottom of the battery cell mounting groove 15.

[0054] The gap is filled with thermally conductive adhesive 2, and the height of the gap is between 1 mm and 2 mm.

[0055] During installation, the negative electrode 31 of the battery cell 3 is glued to the water-cooled plate 1 with structural adhesive (there is actually a 1-2mm gap between the negative electrode end of the battery cell and the surface of the water-cooled plate 1, which is fixed by applying adhesive to the center of the battery cell). After the module is assembled, the well-stirred thermal conductive adhesive 2 is poured into the bottom. After a period of time, it is allowed to stand and solidify, so that the gap between the negative electrode end of the battery cell and the water-cooled plate 1 is filled by the thermal conductive adhesive 2.

[0056] The water-cooled plate 1 includes a base plate 13 and side plates 14 disposed around the base plate 13. The side plates 14 and the base plate 13 together form the cell mounting groove 15. The base plate 13 is provided with a cell venting and pressure relief hole 12, which is located at the bottom of the cell 3.

[0057] The inner and outer surfaces of the water-cooled plate 1 are coated with insulating varnish.

[0058] The battery pack module also includes a plastic bracket 4, a busbar 5, and a flexible FPC 6 for data acquisition. The plastic bracket 4 is installed on the top of the cell assembly. The flexible FPC 6 and the busbar 5 are respectively installed on the plastic bracket 4. The busbar 5 is divided into positive and negative groups, which are respectively connected to the positive and negative terminals of the cell 3 through electrical connection devices 7. The positive and negative connections of the busbar 5 to the cell 3 are separate, but on the same plane.

[0059] The plastic bracket 4 is preferably a transparent PC bracket.

[0060] The flexible FPC6 is connected to the bus 5 to collect voltage and temperature data for each string.

[0061] The outer side of the plastic bracket 4 and the outer side of the water-cooled plate 1 are respectively provided with alignment protrusions 81 for assembly and alignment. The alignment protrusions 81 are provided with semi-circular grooves. The plastic bracket 4 and the water-cooled plate 1 can be limited and fixed by the alignment protrusions 81.

[0062] The plastic bracket 4 and the water-cooled plate 1 are respectively provided with upper and lower interlocking fixed positioning posts 82. The upper and lower interlocking fixed positioning posts 82 are the cooperation of positioning holes and positioning posts. That is, one fixed positioning post has a positioning hole, and the other fixed positioning post is inserted into the positioning hole as a positioning post. It is used for the alignment of the water-cooled plate 1 and the plastic bracket 4, and also for the use of fixing rods when the modules are expanded and stacked in the future.

[0063] The plastic bracket 4 and the fixed positioning post 81 on the water-cooling plate 1 are both provided with through holes. There are at least two battery pack modules 100 arranged in a stacked manner. The stacked battery pack modules 100 are fixed by a fixing rod passing through the through holes of the fixed positioning post 82 on the plastic bracket 4 and the water-cooling plate 1. Each battery pack module 100 is equipped with two branch water pipes 107, which are connected to the water outlet pipe 105 and the water inlet pipe 106 respectively, thereby realizing water cooling circulation.

[0064] The outlet pipe 105 and the inlet pipe 106 are the main water pipes of the battery pack. The main water pipes of the battery pack are connected to the thermal management system. The coolant in the pipes is circulated by a water pump to realize heat exchange between the entire battery pack and the thermal management system, thereby achieving heating and cooling of the entire battery pack. The position and installation of the water pipes can be adjusted according to the position of the module water cooling plate.

[0065] The module can be assembled into a battery system of different capacity by stacking an odd or even number of small modules and connecting them with long screws and rods. The number of stacked layers of the module can be determined according to the required capacity.

[0066] The water outlets of all modules are connected in parallel to the main water outlet pipe via branch water pipes, and the water inlets of all modules are connected in parallel to the main water inlet pipe via branch water pipes. The main water pipe of the battery system is connected to the vehicle thermal management system or the battery system's built-in thermal management module to achieve heating and cooling of the entire battery system.

[0067] The plastic bracket 4 is provided with grooves to accommodate the busbar 5 and the flexible FPC 6 for data acquisition. The busbar 5 and the flexible FPC 6 for data acquisition are fixed to the grooves of the plastic bracket 4 by adhesive.

[0068] The flexible FPC6 for data acquisition is located on the side of the plastic bracket 4, the busbar 5 is located on the top surface of the plastic bracket 4, and all the positive terminals of the battery cells 3 of the battery cell assembly face upwards and are bonded to the plastic bracket 4 together with glue.

[0069] like Figures 11 to 12 As shown, the multi-layer stacked extended battery pack module 100 is installed inside the battery pack aluminum barrel 200. One end is encapsulated with the battery pack top cover 300, and the other end is encapsulated with the thermal management module 400. The thermal management module 400 serves as a bottom cover and also has the functions of cooling and heating.

[0070] The thermal management module 400 includes a water-cooled connector 401, a heat exchange plate 402, a water pump 403, a cooling fan 405, and a heat sink 406. The water pump 403 is connected to the heat exchange plate 402 through a water-cooled inlet and outlet circulation pipe 404. The two water-cooled connectors 401 are connected to the outlet pipe 105 and the inlet pipe 106 respectively, thereby realizing water-cooled circulation.

[0071] A semiconductor cooling chip 407 is provided on the heat sink 406, a heating chip 408 is provided on the heat exchange plate 402, and a heat insulation sheet 409 is provided between the heat exchange plate 402 and the heat sink 406.

[0072] The heat exchange plate 402 has an internal serpentine water channel, with a heating element 408 attached to one side and a thermoelectric cooler 407 attached to the other. Heating or cooling of the coolant flowing through the heat exchange plate 402 is achieved by controlling the activation of either the heating element 408 or the thermoelectric cooler 407. A heat sink 406 and a cooling fan 405 dissipate heat from the thermoelectric cooler 407 to ensure its normal operation. Compared to traditional compressor refrigeration systems, this invention's thermal management module features high reliability, small size, easy installation, and low cost. If the vehicle system lacks a thermal management system, the battery system can be equipped with a thermal management module.

[0073] Figure 12This diagram shows the assembly of the battery system and thermal management module. The battery system's water circuit is connected to the thermal management module's water circuit. A water pump 403 circulates the coolant within the pipes, achieving heat exchange between the entire battery pack and the thermal management module. The thermal management module can also be designed as the front cover of the battery system, with its front surface facing the wind, further aiding in heat dissipation and thus achieving thermal management of the entire battery pack. The position and installation of the water pipes can be adjusted according to the location of the module's water-cooling plate.

[0074] The present invention provides a battery pack module with a high-efficiency liquid cooling heat dissipation structure, wherein the newly set water cooling plate has the following characteristics: 1. The entire water-cooled plate is tray-shaped with raised edges around it to facilitate the potting of thermally conductive adhesive; 2. Water-cooled bosses 11 extend from the six empty areas between the battery cells 3 in the middle of the water-cooled plate 1 to increase the heat exchange area. If the heat exchange requirements are not high, the water-cooled bosses 11 can be reduced or omitted to lower costs and simplify the process. 3. Serpentine water channel 10: The water-cooled plate 1 is designed with a serpentine water channel 10, which starts from the water inlet 101 of the water-cooled plate 1 and ends at the water outlet 102 of the water-cooled plate 1. The serpentine water channel 10 can be one or more connected in parallel, but each water-cooled protrusion 11 must have a water channel passing through it. 4. Water-cooled boss 11: Each water-cooled boss 11 is hollow with a raised center, which facilitates the upward change of the flow direction of water when it passes through the water-cooled boss, resulting in better heat exchange. 5. Cell venting and pressure relief hole 12: If the cell pressure relief valve is located at the bottom of the cell, a pressure relief hole needs to be opened in the middle of the water cooling plate 1 to facilitate pressure relief when the cell experiences thermal runaway. 6. The gap between the battery cell 3 and the water-cooling plate 1 is filled after the thermally conductive adhesive 2 solidifies. The thermally conductive adhesive 2 does not cover the water-cooling boss 11, and the heat exchange area is further increased.

[0075] This invention provides a battery pack module with a high-efficiency liquid cooling structure. A section of the steel shell of the negative electrode of the battery cell is exposed, directly contacting the thermally conductive adhesive. This increases the contact area and directly transfers heat to the water-cooling plate. The liquid cooling system of the water-cooling plate then transfers the heat to the semiconductor assembly. This provides both cooling and heating, resulting in good thermal conductivity when cooling is needed. It also provides good preheating when heating is required in winter. This module offers a higher charge / discharge rate and shorter charging time. The battery pack module is composed of a PC bracket, battery cells, busbars, flexible FPC, thermally conductive adhesive, and a water-cooling plate. Through a reasonable structural design, it ensures safe battery power supply even in harsh environments. The unique high-efficiency thermally conductive adhesive + water-cooling plate + semiconductor thermal management system enables rapid charging and discharging of the battery, significantly reducing the time required to fully charge a battery. The use of thermally conductive materials, the water-cooling plate, and the semiconductor structure design ensures stable and safe operation of the battery under harsh conditions. This battery pack meets performance requirements while ensuring the lifespan of the module's battery cells.

[0076] The present invention provides a battery pack module with a high-efficiency liquid cooling structure, which not only meets the requirements of high-rate charging and discharging, but also can dissipate heat quickly. It can meet the needs of electric motorcycles with high-rate charging and discharging, and can be used in special environments such as racing-level high-speed electric motorcycles, mountain bikes, beach four-wheel drive electric motorcycles, and some special working conditions such as food delivery and express delivery.

[0077] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A battery pack module with a high-efficiency liquid cooling heat dissipation structure, characterized in that: The device includes a water-cooling plate and a battery cell assembly. The battery cell assembly comprises at least two cells, all with their negative terminals facing downwards. At least a portion of the lower end of each cell's casing is exposed. The water-cooling plate has a cell mounting groove, with the negative terminal of each cell adhering to the bottom of the groove. Thermally conductive adhesive is present within the mounting groove, covering the exposed casing portion of the cell and solidifying with the water-cooling plate and the cells. A water-cooling boss is located on the mounting groove of the water-cooling plate, positioned in the gap between adjacent cells and adhering to the side of the adjacent cell. A snake-shaped structure is present inside the water-cooling plate. The serpentine water channel includes a main water channel and a water-cooled boss water channel connected to the main water channel. The main water channel is arranged along the plane of the water-cooling plate. The water-cooled boss water channel is located inside the water-cooled boss and is arranged along the outer contour of the water-cooled boss. The side of the water-cooled boss is provided with an arc surface that fits against the battery cell. The thermally conductive adhesive covers the water-cooled boss. There are three arc surfaces that are distributed at 120° intervals around the circumference of the water-cooled boss. The water-cooled boss water channel passes through each arc surface. The battery cell is a cylindrical battery cell. Each cylindrical battery cell has six water-cooled bosses distributed around its circumference. There is a gap between the lower end face of the battery cell and the bottom of the groove of the battery cell mounting groove.

2. The battery pack module with a high-efficiency liquid cooling structure according to claim 1, characterized in that: The gap is filled with thermally conductive adhesive, and the height of the gap is between 1 mm and 2 mm.

3. The battery pack module with a high-efficiency liquid cooling structure according to claim 1, characterized in that: The water-cooled boss includes a boss shell and a boss core with matching shapes, and there is a hollow structure between the boss shell and the boss core that forms the water channel of the water-cooled boss.

4. The battery pack module with a high-efficiency liquid cooling structure according to claim 1, characterized in that: The battery pack module also includes a plastic bracket, a busbar, and a flexible FPC for data acquisition. The plastic bracket is installed on top of the battery cell assembly. The flexible FPC and the busbar are respectively installed on the plastic bracket. The busbar is divided into positive and negative groups, which are respectively connected to the positive and negative terminals of the battery cells through electrical connection devices. The flexible FPC is connected to the busbar to collect voltage data and temperature data for each cell. The outer side of the plastic bracket and the outer side of the water-cooling plate are respectively provided with alignment ribs for assembly alignment. The alignment ribs are provided with semi-circular grooves. The plastic bracket and the water-cooling plate are respectively provided with upper and lower interlocking positioning posts. The upper and lower interlocking positioning posts are the fit between positioning holes and positioning posts.

5. The battery pack module with a high-efficiency liquid cooling structure according to claim 4, characterized in that: The plastic bracket and the fixing positioning post on the water-cooling plate are all provided with through holes. There are at least two battery pack modules, which are stacked one on top of the other. The stacked battery pack modules are fixed by fixing rods passing through the through holes of the fixing positioning post on the plastic bracket and the water-cooling plate.

6. The battery pack module with a high-efficiency liquid cooling structure according to claim 4, characterized in that: The plastic bracket has grooves to accommodate the busbar and the flexible FPC for data acquisition. The busbar and the flexible FPC for data acquisition are fixed to the grooves of the plastic bracket with adhesive. The flexible FPC for data acquisition is located on the side of the plastic bracket, and the busbar is located on the top surface of the plastic bracket. The positive terminals of all the cells in the battery pack face upward and are bonded to the plastic bracket as a whole with adhesive.

Images