Cylindrical battery pack module and cylindrical battery pack module connecting method

Abstract

The invention provides a cylindrical battery pack and a cylindrical battery pack module connection method. The cylindrical battery pack module comprises cylindrical batteries, a plurality of snakelike water-cooling plates, a plurality of snakelike connecting plates, two module side plates and a box body pouring sealant, and the cylindrical battery pack module connecting method comprises the following steps: S1, bonding the plurality of cylindrical batteries to the left and right sides of the snakelike water-cooling plates through a heat-conducting structural adhesive to form a battery-water-cooling plate assembly; s2, the battery-water cooling plate assemblies are bonded to the left side and the right side of the S-shaped connecting plate through heat conduction structural adhesives; s3, the two module side plates are bonded to the side faces of the two rows of cylindrical batteries on the outermost side in the left-right direction through the heat conduction structural adhesive, and a battery pack module is formed; s4, putting the battery pack module into the battery pack box body through a tool; and S5, connecting the module side plate with the side wall of the battery pack box body through box body pouring sealant.

Description

TECHNICAL FIELD

[0001] The present application relates to a battery pack module, and in particular to a cylindrical battery pack module and a cylindrical battery pack module connection method. BACKGROUND

[0002] At present, the cylindrical battery pack (such as Tesla 4680 large cylindrical battery pack) is mostly filled with foam by the whole pack. The general steps of filling with foam are as follows: all parts of the battery pack are assembled → the foam is injected → the upper cover and the lower box body are fastened → the foam is automatically foamed and fills the space in the pack. The current technical solution increases the weight of the battery pack, reduces the weight grouping efficiency, and has a large process operation difficulty. This whole pack foam filling brings weight redundancy, and the foaming time and foaming uniformity are also difficult to control. Incomplete foaming or the existence of bubbles will greatly affect the reliability and life of the battery pack, so it is necessary to have a way to discharge the gas in the foaming process; the most harmful non-uniformity is that the foam does not cover some places, so there will be a small "air hole". SUMMARY

[0003] The present application is made in view of the above state of the art. The purpose of the present application is to provide a cylindrical battery pack module and a cylindrical battery pack module connection method.

[0004] The embodiment of the present application provides a cylindrical battery pack module connection method, the cylindrical battery pack module comprising a cylindrical battery, a plurality of serpentine water-cooled plates, a plurality of serpentine connecting plates, two module side plates and a box filled with glue, the connection method comprising the following steps: S1, a plurality of the cylindrical batteries are adhered to the left and right sides of the serpentine water-cooled plates through a heat-conducting structure, forming a battery-water-cooled plate assembly; S2, the battery-water-cooled plate assembly is adhered to the left and right sides of the serpentine connecting plate through a heat-conducting structure; S3, the two module side plates are adhered to the side surfaces of the two rows of cylindrical batteries on the outermost left and right directions through a heat-conducting structure, forming a battery pack module; S4, the battery pack module is placed in the battery pack box through a tool; S5, the module side plates and the side walls of the battery pack box are connected through the box filled with glue.

[0005] In at least one embodiment, the module filled with glue is filled in the gap between the cylindrical batteries, and the foaming height of the module filled with glue is controlled by controlling the amount of the module filled with glue.

[0006] In at least one embodiment, the height of the module filled with glue after foaming is less than or equal to the height of the cylindrical battery.

[0007] In at least one embodiment, in the left-right direction, the serpentine water-cooling plate and the serpentine connecting plate are alternately arranged, and the serpentine water-cooling plate or the serpentine connecting plate is located between two adjacent rows of cylindrical batteries.

[0008] In at least one embodiment, the serpentine water-cooling plate is made of aluminum alloy; and / or the serpentine connecting plate and the module side plate are made of plastic or aluminum alloy.

[0009] In at least one embodiment, the density of the module potting compound after foaming is less than 0.2 g / cm³.

[0010] In at least one embodiment, the elastic modulus of the encapsulating adhesive for the enclosure is greater than 200 MPa.

[0011] In at least one embodiment, the battery pack housing includes a water tank and an electrical compartment located at both ends along the length of the battery pack housing, the serpentine water-cooling plate is connected to the water-cooling pipe of the water tank, and the cylindrical battery is connected to the electrical components of the electrical compartment.

[0012] The embodiments of this application also provide a cylindrical battery pack module, which includes a cylindrical battery, multiple serpentine water-cooling plates, multiple serpentine connecting plates, two module side plates, and a casing potting compound.

[0013] Multiple cylindrical batteries are bonded to the left and right sides of the serpentine water-cooling plate using thermally conductive structural adhesive to form a battery-water-cooling plate assembly. The battery-water-cooling plate assembly is bonded to the left and right sides of the serpentine connecting plate using thermally conductive structural adhesive. The two module side plates are bonded to the sides of the two outermost rows of cylindrical batteries in the left and right directions using thermally conductive structural adhesive to form a battery pack module. The battery pack module is placed in the battery pack housing, and the housing is encapsulated with potting compound to connect the module side plates to the side walls of the battery pack housing.

[0014] In at least one embodiment, the cylindrical battery pack module is manufactured using the cylindrical battery pack module connection method according to this application. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a module without potting compound according to an embodiment of this application.

[0016] Figure 2 This is a schematic diagram of a module-based encapsulant-free battery pack according to an embodiment of this application.

[0017] Figure 3 This is a schematic diagram of a module with potting compound according to an embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the module potting compound height according to an embodiment of this application.

[0019] Figure 5 This is a schematic diagram of a potting compound battery pack according to an embodiment of this application. Detailed Implementation

[0020] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0021] See Figures 1 to 5 The embodiments of this application provide a method for connecting a cylindrical battery pack module. The cylindrical battery pack module includes a cylindrical battery 1, multiple serpentine water-cooling plates 2, multiple serpentine connecting plates 3, two module side plates 4, and a casing potting compound 5. The connection method includes the following steps: S1, multiple cylindrical batteries 1 are bonded to the left and right sides of the serpentine water-cooling plates 2 using thermally conductive structural adhesive. Figure 1 S2, the battery-water-cooled plate assembly is formed by attaching the battery-water-cooled plate assembly to the left and right sides of the serpentine connecting plate 3 using thermally conductive structural adhesive; S3, the two module side plates 4 are attached to the left and right sides respectively using thermally conductive structural adhesive (corresponding to the left and right directions). Figure 1 S4. The outermost two rows of cylindrical batteries 1 in the vertical direction are arranged to form a battery pack module; S5. The battery pack module is placed into the battery pack housing 6 using a tooling; S6. The module side plate 4 and the side wall of the battery pack housing 6 are connected by the housing potting glue 5.

[0022] See Figure 1 and Figure 2 Each step of the design is closely adapted to the lightweight requirements of the battery pack for eVTOL (Electric Vertical Take-Off and Landing) aircraft. In S1, an aluminum alloy serpentine water-cooling plate 2 can be used, and the cylindrical battery 1 is bonded to both sides of it with thermally conductive structural adhesive to build an efficient heat conduction path of "cell-thermal conductive adhesive-water-cooling plate". In S2, the serpentine connecting plate 3 can be made of plastic or aluminum alloy. In S3, the module side plate 4 made of plastic or aluminum alloy is bonded to the side of the outermost cylindrical battery 1 with thermally conductive structural adhesive, which not only integrates the scattered cylindrical batteries 1 into a whole module to prevent displacement, but also lays the foundation for subsequent potting. In S4, the module is accurately placed into the battery pack housing 6 with the help of special tooling to avoid the hidden dangers caused by manual placement. In S5, the housing potting adhesive 5 is used to fill the gaps, reduce the amount of potting adhesive used in the battery pack, improve the weight assembly efficiency of the battery pack and the range of the eVTOL aircraft. The modules are pre-assembled and connected. After being placed in the box, potting compound is only applied to the gap between the module and the side of the box, which greatly simplifies the process and ensures the quality of the potting compound foaming.

[0023] Optionally, the gaps in the cylindrical battery 1 are filled with module potting compound 7, and the foaming height of the module potting compound 7 is controlled by managing the amount of potting compound 7. The weight of the potting compound can be further controlled by controlling the foaming height of the module potting compound 7. The volume of the area requiring potting compound foaming can be calculated; the foaming amount and height can be controlled through theoretical calculation of the foaming area volume combined with test verification.

[0024] join Figure 3 When the rigidity of the module's unencapsulated battery pack cannot meet the design requirements (for example, the load conditions at the battery pack installation location measured by the aircraft are large, resulting in severe delamination of the internal adhesive; or the battery pack becomes larger, the number of batteries increases, and the weight of the battery pack increases), the rigidity of the battery pack can be improved by pre-filling the gaps between the cylindrical batteries 1 in the module with module encapsulation adhesive 7.

[0025] Optionally, the height of the module potting compound 7 after foaming can be less than or equal to the height of the cylindrical battery 1.

[0026] Optionally, in the left-right direction, the serpentine water-cooling plate 2 and the serpentine connecting plate 3 are alternately arranged, with either the serpentine water-cooling plate 2 or the serpentine connecting plate 3 between adjacent rows of cylindrical batteries 1. The alternating arrangement of the serpentine water-cooling plate 2 or the serpentine connecting plate 3 is an optimization and upgrade of the internal layout of the module. Its core logic lies in further balancing the cooling and weight reduction requirements of the cylindrical batteries through the complementary distribution of the two functional components.

[0027] Optionally, the serpentine water-cooling plate 2 can be made of aluminum alloy; and / or the serpentine connecting plate 3 and the module side plate 4 can be made of plastic or aluminum alloy. Using plastic for the serpentine connecting plate 3 and the module side plate 4 is preferable, as plastic is lighter and can reduce weight.

[0028] Optionally, the density of the module potting compound 7 after foaming is less than 0.2 g / cm³.

[0029] Optionally, the elastic modulus of the encapsulant 5 is greater than 200 MPa. The high elastic modulus of the encapsulant 5 increases the connection stiffness between the module and the battery pack housing 6, thereby improving the overall stiffness of the battery pack.

[0030] Optionally, the battery pack housing 6 includes components located along the length direction of the battery pack housing 6. Figure 2 The water tank 8 and the battery tank 9 are located at both ends in the left and right directions of the middle section. The serpentine water-cooling plate 2 is connected to the water-cooling pipe of the water tank 8, and the cylindrical battery 1 is connected to the electrical components of the battery tank 9.

[0031] See Figure 2 and Figure 5The water tank 8 and the battery compartment 9 are located at opposite ends of the enclosure, achieving physical isolation between water and electricity to avoid mutual interference and without occupying space in the middle module, thus ensuring the energy density of the battery pack. The serpentine water-cooling plate 2 and the water tank 8 can adopt a quick-connect sealing structure for rapid disassembly and maintenance; the cylindrical battery 1 can be connected to the high-voltage electrical components of the battery compartment 9 through connectors, which can reduce unnecessary losses.

[0032] The embodiments of this application also provide a cylindrical battery pack module, which includes a cylindrical battery 1, multiple serpentine water-cooling plates 2, multiple serpentine connecting plates 3, two module side plates 4, and a casing potting compound 5.

[0033] Multiple cylindrical batteries 1 are bonded to the left and right sides of a serpentine water-cooled plate 2 with thermally conductive structural adhesive to form a battery-water-cooled plate assembly. The battery-water-cooled plate assembly is bonded to the left and right sides of a serpentine connecting plate 3 with thermally conductive structural adhesive. Two module side plates 4 are bonded to the sides of the two outermost rows of cylindrical batteries 1 in the left and right directions respectively with thermally conductive structural adhesive to form a battery pack module. The battery pack module is placed in the battery pack housing 6, and the housing potting compound 5 connects the module side plates 4 and the side walls of the battery pack housing 6.

[0034] Optionally, the cylindrical battery pack module is manufactured using the above-described cylindrical battery pack module connection method.

[0035] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0036] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0037] It should be understood that the above-described embodiments, examples, or examples are merely exemplary and are not intended to limit this application. Those skilled in the art can make various modifications and changes to the above-described embodiments, examples, or examples under the teachings of this application without departing from the scope of this application.

Claims

1. A cylindrical battery pack module connection method, characterized by, The cylindrical battery pack module comprises cylindrical batteries (1), a plurality of serpentine water-cooled plates (2), a plurality of serpentine connecting plates (3), two module side plates (4) and box potting glue (5), and the connecting method comprises the following steps: S1, a plurality of the cylindrical batteries (1) are adhered to the left and right sides of the serpentine water-cooled plate (2) through a heat-conducting structure to form a battery-water-cooled plate assembly; S2, the battery-water-cooled plate assembly is adhered to the left and right sides of the serpentine connecting plate (3) through a heat-conducting structure; S3, the two module side plates (4) are respectively adhered to the side surfaces of the two outermost rows of cylindrical batteries (1) in the left-right direction through a heat-conducting structure to form a battery pack module; S4, the battery pack module is placed in a battery pack box (6) through a tooling; S5, the module side plate (4) and the side wall of the battery pack box (6) are connected through the box potting glue (5).

2. The cylindrical battery pack module connection method of claim 1, wherein, The gap between the cylindrical batteries (1) is filled with module potting glue (7), and the foaming height of the module potting glue (7) is controlled by controlling the amount of the module potting glue (7).

3. The cylindrical battery pack module connection method of claim 2, wherein, The height of the module potting glue (7) after foaming is less than or equal to the height of the cylindrical battery (1).

4. The cylindrical battery pack module connection method of claim 1, wherein, In the left-right direction, the serpentine water-cooled plate (2) and the serpentine connecting plate (3) are arranged alternately, and the serpentine water-cooled plate (2) or the serpentine connecting plate (3) is arranged between the two adjacent rows of cylindrical batteries (1).

5. The cylindrical battery pack module connection method of claim 1, wherein, The material of the serpentine water-cooled plate (2) is aluminum alloy; and / or The material of the serpentine connecting plate (3) and the module side plate (4) is plastic or aluminum alloy.

6. The cylindrical battery pack module connection method of claim 2, wherein, The density of the module potting glue (7) after foaming is less than 0.2 g / cm³.

7. The cylindrical battery pack module connection method of claim 1, wherein, The elastic modulus of the box potting glue (5) is greater than 200 Mpa.

8. The cylindrical battery pack module connection method of claim 1, wherein, The battery pack box (6) comprises a water tank (8) and an electrical tank (9) respectively located at the two ends in the length direction of the battery pack box (6), the serpentine water-cooled plate (2) is connected with the water-cooled pipeline of the water tank (8), and the cylindrical battery (1) is connected with the electrical assembly of the electrical tank (9).

9. A cylindrical battery pack module, characterized by, The cylindrical battery (1), the plurality of serpentine water-cooled plates (2), the plurality of serpentine connecting plates (3), the two module side plates (4) and the box potting glue (5), The plurality of cylindrical batteries (1) are adhered to the left and right sides of the serpentine water-cooled plate (2) through a heat-conducting structure to form a battery-water-cooled plate assembly, the battery-water-cooled plate assembly is adhered to the left and right sides of the serpentine connecting plate (3) through a heat-conducting structure, the two module side plates (4) are respectively adhered to the side surfaces of the two outermost rows of cylindrical batteries (1) in the left-right direction through a heat-conducting structure to form a battery pack module, and the battery pack module is placed in a battery pack box (6), and the module side plate (4) and the side wall of the battery pack box (6) are connected through the box potting glue (5).

10. The cylindrical battery pack module of claim 9, wherein, The use right claim 1 to 8 any one of the cylindrical battery pack module connecting method is made.

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