Water inlet joint structure, liquid cooling plate structure and battery module

Abstract

To provide a water inlet joint structure, a liquid cooling plate structure, and a battery module thereof, which can use a liquid cooling plate to cool a direct contact pouch cell, do not require connecting an additional pipe, can significantly reduce the distance between cells, and enable the liquid cooling plate to exhibit the highest cooling efficiency. [Solution] The water inlet coupling structure 1 includes a coupling body having an upper surface 11, a lower surface 12, a main flow groove 13 communicating with the upper and lower surfaces, an opening at one end located in the peripheral side wall, and an opening at the other end having a side guide groove 14 communicating with the main flow groove. This water inlet coupling structure is directly embedded in a thin-plate liquid cooling plate 30, with the main flow groove receiving the coolant and the side guide groove directing the coolant into the thin-plate liquid cooling plate. The water inlet coupling structure can be stacked axially, forming a communicating main flow groove for coolant flow, solving the problem of difficulty in connecting water inlet couplings for conventional stacked thin-plate liquid cooling plates with pipes.

Description

[Technical Field]

[0001] This invention relates to a joint structure, and in particular to a water inlet joint structure, a liquid cooling plate structure, and a battery module thereof, which are applicable to a thin liquid cooling plate. [Background technology]

[0002] Due to the double burden of environmental pollution and energy shortages, governments and major automakers around the world are expanding research and development into electric vehicles, and the electric vehicle market is booming. The traction battery is considered one of the three major components of an electric vehicle (battery, electric machine, and electric control), and is attracting widespread interest from governments and major automakers around the world. Lithium-ion batteries are currently considered a suitable power source for electric vehicles, and while they pursue high energy density, they also pose a problem of high heat dissipation. The high heat dissipation of lithium batteries causes rapid temperature rises, posing a major challenge to the performance of lithium batteries and the safety of electric vehicles. Since the cycle life and safety of lithium batteries are largely determined by the actual operating temperature of the battery, it is extremely important to design a rational cooling system for lithium batteries.

[0003] Currently, the cooling method for high-power lithium batteries is mainly liquid cooling, and the heat dissipation methods for pouch cells can be divided into two types: direct contact conduction and indirect contact conduction. Most of the liquid cooling heat dissipation methods used for pouch cells on the market use indirect contact conduction, with only a few using direct contact conduction.

[0004] Indirect contact conduction mainly involves contacting a heat conduction plate with the cell surface, conducting the heat from the cell to the side, and then using a liquid cooling device to dissipate the heat. Direct contact conduction, on the other hand, involves directly contacting a small liquid cooling plate with the cell to directly dissipate the heat from the cell. The liquid cooling efficiency of indirect contact conduction is relatively low, the temperature difference between the battery is relatively large, and the need for additional heat conduction plates increases the overall weight and cost of the battery. However, liquid cooling heat dissipation using direct contact conduction is technically difficult to overcome, especially when pouch cells are relatively thin and need to be stacked densely, leaving no space for connecting cooling pipes. The direct contact conduction liquid cooling heat dissipation currently used in electric vehicles is highly efficient in terms of temperature management, but its cooling pipes require a relatively large space for connecting the pipes, and the structure is complicated due to the use of multiple layers.In addition, the use of a plastic frame raises concerns about the structural strength and sealing performance being insufficient.

[0005] Based on the above-mentioned shortcomings of the existing technology, the present invention proposes a water inlet joint structure, a liquid cooling plate structure and a battery module thereof, which can effectively solve the above-mentioned problems. Summary of the Invention [Problem to be solved by the invention]

[0006] The main purpose of this invention is to provide a water inlet joint structure, a liquid cooling plate structure, and a battery module using the same. By utilizing the direct connection characteristics of the water inlet joint structure, the liquid cooling plate can be used to cool direct-contact pouch cells. This eliminates the need for additional pipe connections, greatly reduces the distance between cells, and allows the liquid cooling plate to achieve the highest cooling efficiency. [Means for solving the problem]

[0007] This invention provides a water inlet joint structure suitable for use in a liquid cooling plate structure and connected to an external pipe. The water inlet joint structure includes a joint body having at least one main flow groove, a plurality of side guide grooves, and a waterproof groove, the main flow groove communicating with the upper and lower surfaces of the joint body. One end of the side guide groove is open on the peripheral side wall of the joint body, and the other end opens into the main flow groove. The waterproof groove is provided on the upper surface of the joint body, surrounding the periphery of the main flow groove, and at least one gasket is provided within the waterproof groove.

[0008] In addition, the liquid cooling plate structure disclosed in this invention is formed by joining two thin plates together to form at least one liquid cooling channel, and further utilizes a channel inlet and a channel outlet connected to the liquid cooling channel to allow the coolant to flow into or out of the liquid cooling channel. The liquid cooling plate structure utilizes the aforementioned water inlet joint structure attached to the channel inlet and / or channel outlet, allowing the external coolant to be received in the main flow channel and then flow out of the side channel into the liquid cooling plate, or the side channel receives the coolant in the liquid cooling channel and then flows out vertically from the main flow channel.

[0009] The present invention also provides a battery module including multiple battery cells. The battery cells are stacked alternately with the aforementioned liquid cooling plate structures, and the upper surfaces of the water inlet joint structures of the battery cells are directly connected to the lower surfaces of the adjacent water inlet joint structures, allowing the coolant to flow to all the liquid cooling plate structures. This eliminates the need for additional pipe connections, achieving both energy density and heat dissipation performance.

[0010] The present invention will be described in detail below with specific examples, so that the objectives, technical contents, features and effects achieved by the present invention can be more easily understood. [Brief explanation of the drawings]

[0011] [Figure 1A] 1 is a top view of the water inlet joint structure of the present invention; FIG. [Figure 1B] 1 is a three-dimensional cross-sectional view of a water inlet joint structure of the present invention; [Figure 1C] 1 is a three-dimensional bottom view of the water inlet joint structure of the present invention; [Figure 2] 1 is a schematic diagram of the water inlet joint structure of the present invention stacked and connected. [Figure 3A] FIG. 1 is an exploded view of the water inlet joint structure and the liquid cooling plate structure before they are assembled together. [Figure 3B] FIG. 10 is a three-dimensional top view of the partial structure after the water inlet joint structure and the liquid cooling plate structure are combined. [Figure 3C] FIG. 10 is a three-dimensional bottom view of the partial structure after the water inlet joint structure and the liquid cooling plate structure are combined. [Figure 4] 1 is a schematic diagram of a liquid cooling plate structure according to the present invention; [Figure 5] 1 is a schematic diagram of two stacked liquid cooling plate structures of the present invention. [Figure 6] 1 is a schematic diagram of a liquid cooling plate structure and a battery cell stack according to the present invention; [Figure 7] 1 is a schematic exploded view of a battery module according to the present invention; [Figure 8] 1 is a schematic diagram of another embodiment of a battery module according to the present invention; [Figure 9A] 1 is a top view of another embodiment of the water inlet joint structure of the present invention; FIG. [Figure 9B] 1 is a three-dimensional bottom view of another embodiment of the water inlet joint structure of the present invention; FIG. [Figure 10A] FIG. 10 is a top view of another embodiment of the water inlet joint structure of the present invention; [Figure 10B] 10 is a three-dimensional bottom view of another embodiment of the water inlet joint structure of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] In order to make the advantages, principles and features of the present invention easier and clearer to understand, the following description will be given by way of examples and with reference to the drawings. It should be clearly stated that these examples are merely representative examples of the present invention, and the embodiments and claims of the present invention are not limited to the forms of these examples. The purpose of providing these examples is simply to make the disclosure of the present invention more thorough and easier to understand.

[0013] The terms used in the various embodiments disclosed herein are used only for the purpose of describing specific embodiments and are not intended to limit the various embodiments disclosed herein. Unless otherwise clearly indicated, the singular forms used include the plural forms. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the various embodiments disclosed herein belong. The above terms (e.g., terms defined in commonly used dictionaries) are to be interpreted as having the same meaning as in the context of the same technical field, and are not to be interpreted as having an idealized or overly formal meaning, unless expressly defined in the various embodiments disclosed herein.

[0014] In the present specification, the term "embodiment," "specific embodiment," or the like means that the combination of specific features, structures, materials, or properties described in the embodiment is included in at least one embodiment of the present invention. In the present specification, general descriptions of the above terms do not necessarily refer to the same embodiment. Furthermore, the specific features, structures, materials, or properties described can be combined as appropriate in any one or more embodiments.

[0015] In the description of the present invention, it should be explained that unless otherwise specified or defined, the terms "coupled," "connected," and "installed" should be understood in a broad sense. For example, they may refer to a mechanical connection or an electrical connection, or to a connection between two elements, a direct connection, or a connection via an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms based on specific circumstances.

[0016] 1A to 1C show the water inlet joint structure 1 disclosed in the present invention. Fig. 1A is a three-dimensional top view of the water inlet joint structure, Fig. 1B is a three-dimensional cross-sectional view of the water inlet joint structure, and Fig. 1C is a three-dimensional bottom view of the water inlet joint structure. The water inlet joint structure 1 of the present invention comprises a joint body 10 having at least one main flow groove 13, a plurality of side guide grooves 14 and a waterproof groove 111, the main flow groove 13 communicating with the upper surface 11 and the lower surface 12 of the joint body 10. One end opening of the side guide groove 14 is located in the peripheral side wall 16 of the joint body 10, and the other end opening communicates with the main flow groove 13. As shown in the figure, the joint body 10 has a roughly cylindrical shape, and further has a main flow groove 13 formed axially through the upper surface 11 and the lower surface 12 of the cylinder, which has a roughly circular cross section, and radial side guide grooves 14 formed between the upper surface 11 and the lower surface 12, which communicate with the main flow groove 13. Therefore, the main flow groove 13 and the side guide grooves 14 are roughly perpendicular, and the main flow groove 13 communicates with the side guide grooves 14. The coolant flowing in through the opening of the main flow groove 13 in the upper surface 11 can enter the main flow groove 13, and then flow out from the side of the side guide groove 14 and out from the opening of the main flow groove 13 in the lower surface 12.

[0017] Please also refer to Figure 2. Figure 2 is a schematic diagram of the water inlet joint structure stacked and connected. When two water inlet joint structures 1 are stacked, the two adjacent water inlet joint structures 1 are joined such that their upper surfaces 11 directly contact their lower surfaces 12. As shown in Figure 2, the upper surface 11 of the lower water inlet joint structure 1 directly abuts the lower surface 12 of the upper water inlet joint structure 1, allowing the main flow grooves 13 of the two water inlet joint structures 1 to be directly connected and communicated. The top surface of the upper surface 11 has a waterproof groove 111 and a gasket 21 disposed therein. No recess is provided on the lower surface 12 at the orthographic position corresponding to the waterproof groove 111; preferably, the lower surface 12 is entirely flat. Therefore, when the two water inlet joint structures 1 are connected, the lower surface 12 of the upper water inlet joint structure 1 abuts the upper surface 11 of the lower water inlet joint structure 1 and then abuts the gasket 21 located in the waterproof groove 111 of the upper surface 11, achieving a waterproof seal. Therefore, the height of the gasket 21 is slightly higher than the depth of the waterproof groove 111, which ensures a good sealing waterproof effect, that is, ensures that the coolant does not leak along the joint portion of the main flow groove 13 of the two water inlet joint structures 1. Therefore, as shown by the arrows in Figure 2, the arrows indicate the flow direction of the coolant. The coolant flowing in from the opening of the main flow groove 13 on the upper surface 11 of the upper water inlet coupling structure 1 can enter the main flow groove 13 of the upper water inlet coupling structure 1, flow into the main flow groove 13 of the lower water inlet coupling structure 1, and then flow out from the sides of the corresponding side guide grooves 14 and out from the opening of the main flow groove 13 on the lower surface 12 of the lower water inlet coupling structure 1. Conversely, the coolant flowing in from the side guide grooves 14 of the two water inlet coupling structures 1 can enter the corresponding main flow grooves 13 in turn and merge, and then flow out from the main flow groove 13 of the upper water inlet coupling structure 1.

[0018] Please refer to Figures 3A to 3C and Figure 4. Figure 3A is a three-dimensional exploded view of the water inlet joint structure and the liquid cooling plate structure before they are combined, Figure 3B is a three-dimensional top view of the partial structure after the water inlet joint structure and the liquid cooling plate structure are combined, Figure 3C is a three-dimensional bottom view of the partial structure after the water inlet joint structure and the liquid cooling plate structure are combined, and Figure 4 is a schematic diagram of an embodiment of a liquid cooling plate combined with a water inlet joint structure of the present invention. When the water inlet joint structure 1 is coupled to the liquid cooling plate structure 30, the liquid cooling plate structure 30 has at least one liquid cooling channel 31. Considering that the water inlet joint structure 1 is coupled to the channel inlet 32, the water inlet joint structure 1 can be embedded in the channel inlet 32, or, depending on the material, for example, when the water inlet joint structure 1 and the liquid cooling plate structure 30 are both made of metal, it can be fixed to the channel inlet 32 ​​by welding or other methods. To further strengthen the subsequent coupling and fixation with other liquid cooling plate structures 30, the water inlet joint structure 1 can have a plurality of fixing holes 15 around its periphery, such as four through-hole fixing holes 15 arranged around the main flow groove 13 as shown in the figure. The connection and fixing to adjacent liquid cooling plate structures 30 will be described in detail in the following embodiments. Therefore, the coolant flowing in through the opening of the main flow groove 13 on the upper surface 11 can enter the main flow groove 13 and then flow out from the side of the mutually communicating side guide grooves 14. The water inlet joint structure 1 is embedded in the flow channel inlet 32 ​​of the liquid cooling plate structure 30, and the side guide grooves 14 of the water inlet joint structure 1 communicate with the liquid cooling flow channels 31 of the liquid cooling plate structure 30, so that the coolant flowing out from the side guide grooves 14 can flow into the liquid cooling flow channels 31 through the flow channel inlet 32.

[0019] As shown in Figures 4 and 5, each liquid cooling plate structure 30 of the present invention comprises two thin plates 301 and 302 joined together to form at least one liquid cooling channel 31. As shown in Figure 4, two liquid cooling channels 31 are formed, with the front end of each liquid cooling channel 31 being a channel inlet 32 ​​and the end of each liquid cooling channel 31 being a channel outlet 33. Of course, the number, path arrangement, and shape of the liquid cooling channels 31 can be adjusted or changed based on requirements, and the illustrations are merely schematic. In addition, the thin plates 301 and 302 are preferably made of a metal with good thermal conductivity, and are combined with a cooling liquid to quickly dissipate heat, although the present invention is not limited thereto. The aforementioned water inlet joint structure 1 can be embedded in the flow path inlet 32 ​​and the flow path outlet 33, respectively. The liquid cooling plate structure 30 joins two thin plates 301, 302 to each other, so that the water inlet joint structure 1 can be fixed by welding the peripheral portions of the upper surface 11 and the lower surface 12 to the outer edges of the two thin plates 301, 302 located at the flow path inlet 32 ​​and the flow path outlet 33, thereby fixing the water inlet joint structure 1 to the flow path inlet 32 ​​and the flow path outlet 33.

[0020] 5, the thin plates 301 and 302 of the liquid cooling plate structure 30 form protrusions 301a and 302b facing outward at the flow path inlet 32 ​​and flow path outlet 33, respectively, to form an accommodating space 303 communicating with the liquid cooling flow path 31. In addition, the protrusions 301a and 302b have through holes corresponding to the outer shape of the water inlet coupling structure 1, into which the water inlet coupling structure 1 is fitted or embedded. Furthermore, the height of the accommodating space 303 must be such that at least the open end of the side guide groove 14 located on the peripheral side wall of the coupling body of the water inlet coupling structure 1 is positioned completely within the accommodating space 303, so that the coolant can be confined between the protrusions 301a and 302b of the thin plates 301 and 302 and will not leak from the joint between the water inlet coupling structure 1 and the protrusions 301a and 302b. Although FIG. 5 shows only the flow channel inlet 32, the flow channel outlet 33 has the same structure and is therefore not shown here.

[0021] When two liquid cooling plate structures 30 are stacked, the water inlet joint structures 1 installed on the two liquid cooling plate structures 30 abut against each other, that is, the upper surface 11 of the lower water inlet joint structure 1 directly abuts against the lower surface 12 of the upper water inlet joint structure 1 in the same axial direction, so that the main flow grooves 13 of the two water inlet joint structures 1 can be directly connected and communicated. As mentioned above, the waterproof groove 111 located on the upper surface 11 of the lower water inlet coupling structure 1 has a gasket 21 disposed therein to achieve a waterproof effect after the two water inlet coupling structures 1 are connected, that is, the coolant will not leak along the joint between the main flow grooves 13 of the two water inlet coupling structures 1. Therefore, the coolant flowing in from the opening of the main flow groove 13 on the upper surface 11 of the upper water inlet coupling structure 1 can enter the main flow groove 13 of the upper water inlet coupling structure 1, flow into the main flow groove 13 of the lower water inlet coupling structure 1, and then flow into the liquid cooling channels 31 of the liquid cooling plate structure 30 from the sides of the corresponding side guide grooves 14.

[0022] See Figure 6. Therefore, when stacking battery cells 40, two liquid cooling plate structures 30 can sandwich multiple battery cells 40 to form a group, and a buffer plate 50 (e.g., made of sponge material) can be used to separate the battery cells 40. Please also refer to Figures 4 and 5. The thickness of the liquid cooling plate structure 30 formed by the protrusions 301a and 302b is thicker than the liquid cooling channel 31 area. Furthermore, in combination with the height of the water inlet joint structure 1 installed in the receiving space 303, when two liquid cooling plate structures 30 are stacked, a receiving space is formed between the two liquid cooling plate structures 30, and the battery cells 40 and buffer plate 50 can be installed. Making full use of the space between the two liquid cooling plate structures 30 increases the stacking density, which in turn increases the energy density.

[0023] 7 is a schematic exploded view of a battery module 70 according to the present invention. The configuration in FIG. 7 shows that the liquid cooling plate structures 30 having the aforementioned water inlet joint structure 1 sandwich multiple battery cells 40, with buffer plates 50 installed between adjacent battery cells 40. However, if the battery cells 40 require a relatively high heat dissipation effect, it is possible to combine only a single battery cell 40 with a single liquid cooling plate structure 30, i.e., to sandwich only a single battery cell 40 between two liquid cooling plate structures 30. After stacking, a water inlet joint structure 1 of the uppermost liquid cooling plate structure 30 can be added with a water inlet head 71, which has a downwardly bent pipe joint 74, through which an external coolant pipe is connected. A fixing base 72 can be added to the bottom of the water inlet joint structure 1 of the lowermost liquid cooling plate structure 30, which is used to seal the lowermost water inlet joint structure 1. Furthermore, fixing parts 73 can be passed through the water inlet head 71 and the fixing holes 15 of all the stacked water inlet joint structures 1 and fixed to the fixing base 72, thereby fixing the battery cells 40 and liquid cooling plate structures 30 within the entire battery module 70 to each other.

[0024] In another embodiment, in addition to the aforementioned water injection head 71 having a pipe joint 74 that bends downward, as shown in FIG. 8, the pipe joint 74 of the water injection head 71 can also be bent outward, connecting both sides and guiding the coolant to flow into and out of the liquid cooling plate structure 30. In addition, in another specific embodiment of the present invention, please refer to Figures 9A and 9B, where Figure 9A is a three-dimensional top view of the water inlet joint structure, and Figure 9B is a three-dimensional bottom view of the water inlet joint structure. In addition to the main flow channel 13 of the water inlet joint structure 1 described above having an approximately circular cross section, the main flow channel 13 can also have a rectangular cross section, so that the entire water inlet joint structure 1 has a rectangular shape, which can adapt to the space limitations or coolant flow rate requirements of different battery modules 70. Another specific embodiment of the present invention is shown in Figures 10A and 10B, where Figure 10A is a three-dimensional top view of the water inlet joint structure, and Figure 10B is a three-dimensional bottom view of the water inlet joint structure. The fixing hole 15 of the water inlet joint structure 1 is located in the center, and the main flow groove 13 is arranged around the fixing hole 15 to form a ring. In this configuration, the main flow groove 13 is located in a surrounding manner, so two layers of gaskets 21, inner and outer, are required, which reliably guarantees waterproof performance after lamination. This embodiment can further reduce the volume of the water inlet joint structure 1 or increase the cross-sectional area of ​​the main flow groove 13, thereby increasing the flow rate of the coolant.

[0025] To summarize, this invention provides a water inlet joint structure, a liquid cooling plate structure, and a battery module using the same. Adjacent water inlet joint structures are connected top-to-bottom using a fastening mechanism. By combining a main flow groove and a side guide groove for water outflow from the side, and further incorporating a gasket, the liquid cooling plate structure can achieve fairly high waterproof performance after direct connection using the water inlet joint structure, while eliminating the need for additional pipe connections. The battery module constructed using this structure can achieve good heat dissipation and energy density, achieve stacked heat dissipation through direct contact conduction between battery cells, and improve thermal management efficiency.

[0026] It should be noted that the above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. Therefore, any equivalent changes or modifications made based on the features and spirit of the present invention should be included within the scope of the utility model registration claims of the present invention. [Explanation of symbols]

[0027] 1. Water inlet joint structure 10 Joint body 11 Top surface 111 Waterproof groove 12 Bottom surface 13 Main flow groove 14 Side flow guide groove 15 Fixing hole 16 side wall 21 Gasket 30 Liquid cooling plate structure 301 Thin plate 302 thin plate 301a Protrusion 302b Protrusion 303 Containment Space 31 Liquid cooling channel 32 Channel inlet 33 Flow path outlet 40 battery cells 50 Buffer Plate 70 Battery Module 71 Water injection head 72 Fixed base 73 Fixing parts 74 Pipe Fittings

Claims

1. A water inlet joint structure that is fitted into the liquid cooling plate structure and connected to an external pipe, a coupling body including at least one main flow groove, a plurality of side guide grooves, and at least one waterproof groove, the main flow groove communicating with the upper surface and the lower surface, one end opening of the side guide groove being located on the peripheral side wall and the other end opening communicating with the main flow groove, the waterproof groove being located on the upper surface and surrounding the periphery of the main flow groove; At least one gasket provided in the waterproof groove. Water inlet joint structure.

2. The water inlet joint structure according to claim 1 , wherein the joint body further comprises at least one fixing hole.

3. The water inlet joint structure according to claim 2, wherein the fixing holes are located around the main flow groove.

4. The water inlet joint structure according to claim 2, wherein the main flow groove is located around the fixing hole.

5. 2. The water inlet joint structure according to claim 1, wherein the main flow channel has a circular or rectangular cross section.

6. 2. The water inlet joint structure according to claim 1, wherein no recess is provided in the lower surface of the joint body at an orthogonal projection position corresponding to the waterproof groove.

7. A liquid cooling plate structure comprising two thin plates joined together to form at least one liquid cooling channel, and a channel inlet and a channel outlet connected to the liquid cooling channel for allowing a cooling liquid to flow into or out of the liquid cooling channel, The cooling device according to claim 1, further comprising a water inlet joint structure attached to the flow channel inlet and / or the flow channel outlet to guide the inflow or outflow of the cooling liquid, and the flow channel inlet and / or the flow channel outlet are connected to the side guide grooves of the main flow groove. Liquid cooling plate structure.

8. 8. The liquid cooling plate structure according to claim 7, wherein the thin plate forms protrusions facing outward at the flow path inlet and the flow path outlet, respectively, to form an accommodation space communicating with the liquid cooling flow path, into which the water inlet joint structure is fitted, and further, the opening of the side guide groove located on the peripheral side wall of the joint body is positioned in the accommodation space.

9. At least two liquid cooling plate structures, each of which is formed by joining two thin plates together to form at least one liquid cooling channel, and which utilizes a channel inlet and a channel outlet connected to the liquid cooling channel to allow the coolant to flow into or out of the liquid cooling channel, as described in claim 1, and which has a water inlet joint structure attached to the channel inlet and / or the channel outlet to guide the inflow or outflow of the coolant, and the channel inlet and / or the channel outlet are connected to the side channel guide grooves; at least one battery cell sandwiched between the two liquid cooling plate structures; Battery module.

10. 10. The battery module according to claim 9, wherein the water inlet joint structures are stacked one above the other in the same axial direction, and the upper surface of one joint body is abutted against the lower surface of another adjacent joint body.

11. The battery module according to claim 10, wherein the lower surface of the joint body abuts and contacts the gasket on the upper surface of another adjacent joint body.

12. The battery module according to claim 11, wherein the joint body further includes at least one fixing hole, and a fixing part is fixed to the liquid cooling plate structure by passing through the fixing hole of the joint body.

13. 10. The battery module according to claim 9, wherein the bottom of the lowest liquid cooling plate structure includes a fixed base, thereby sealing the bottom of the water inlet joint structure of the lowest liquid cooling plate structure.

14. 10. The battery module of claim 9, wherein the top of the uppermost liquid cooling plate structure includes a water injection head, and the water injection head includes a pipe joint to guide the cooling liquid in or out.

15. 10. The battery module of claim 9, wherein the thin plate has outward protrusions at the flow path inlet and the flow path outlet, respectively, to form an accommodation space communicating with the liquid cooling flow path, into which the water inlet joint structure is fitted, and further, the opening of the side guide groove located on the peripheral side wall of the joint body is completely positioned in the accommodation space.

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