An immersion type lithium battery module

Abstract

The utility model discloses a kind of infiltration type lithium battery module, including shell, battery module and cooling liquid, the sealing cavity of installation space is equipped in the shell interior, the bottom of the sealing cavity is equipped with water-cooling plate, the water-cooling plate is equipped with through liquid inlet pipeline and liquid outlet pipeline of shell lateral wall, sealing arrangement between the liquid inlet pipeline and liquid outlet pipeline and the lateral wall of shell, the battery module is located in the upper wall of water-cooling plate, the battery module is equipped with the connecting structure of shell lateral wall, the connecting structure is sealing arrangement with the lateral wall of shell, the connecting structure is cable or connector, the cooling liquid is filled into sealing cavity, the cooling liquid is insulating material.Using sealing cavity can effectively reduce the interference of external foreign matter, improve the stability of internal structure, and its structural stability is also better;Using insulating cooling liquid further realizes the overall cooling of battery module, cooling liquid itself has high insulation.

Description

Technical Field

[0001] This utility model relates to the field of lithium batteries, and in particular to an immersion lithium battery module. Background Technology

[0002] Currently, the fixing schemes and usage environments of various lithium battery modules on the market are all different. When lithium batteries are working, due to external environmental factors, they may be used in different extreme environments, or accidental factors may cause the lithium battery pack to be impacted, dropped, squeezed, etc., which may cause short circuits and fire risks to the internal electrical components of the lithium battery.

[0003] Existing cooling solutions, such as Chinese Patent 202422291386.8, employ a water-cooling pipe structure to cool the battery module. However, the water-cooling pipe structure is relatively complex and has poor heat dissipation performance. Utility Model Content

[0004] The main purpose of this invention is to propose an immersion lithium battery module, which aims to improve the existing water-cooling pipe structure and thus enhance the overall heat dissipation effect of the battery module.

[0005] To achieve the above objectives, this utility model proposes an immersed lithium battery module, comprising: The housing has a sealed cavity with an installation space inside. A water-cooling plate is provided at the bottom of the sealed cavity. The water-cooling plate has an inlet pipe and an outlet pipe that pass through the side wall of the housing. The inlet pipe and the outlet pipe are sealed to the side wall of the housing. A battery module is mounted on the upper wall of a water-cooling plate. The battery module has a connecting structure extending out of the side wall of the housing. The connecting structure is sealed to the side wall of the housing. The connecting structure is a cable or a connector. Coolant, which is filled into a sealed cavity, is an insulating material.

[0006] The technical effects of this application; 1. Using a sealed cavity can effectively reduce interference from external foreign objects, improve the stability of the internal structure, and also improve its structural stability; 2. The use of insulating coolant achieves overall cooling of the battery module. The coolant itself possesses high insulation, heat dissipation, thermal conductivity, fire protection, insulation, arc extinguishing, and other related electrical safety characteristics. Examples include fluorinated liquids, novel hydrocarbons, synthetic esters, mineral oils, and silicone oils, thus improving safety in use. 3. The coolant also has fire-retardant properties; 4. Coolant also has a buffering effect, which can effectively reduce resonance during transportation; 5. The inlet and outlet pipes of the water-cooled plate are connected to the cooling circulation pump respectively, thereby realizing active heat dissipation of the coolant and effectively improving the cooling effect of the battery module. This utility model technical solution is as follows. Attached Figure Description

[0007] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the present utility model. Figure 1 ; Figure 3 This is a cross-sectional view of the present utility model. Figure 2 ; Figure 4 This is a schematic diagram of the concealed top cover of this utility model; Figure 5 Schematic diagram of water-cooled plate Figure 1 ; Figure 6 Schematic diagram of water-cooled plate Figure 2 .

[0008] In the picture, 1 represents the outer shell, 11 represents the base, 12 represents the opening, and 13 represents the top cover. 2 is the water-cooled plate, 20 is the flow channel, 21 is the base plate, and 22 is the sealing plate. 3 is the battery module, 30 is the positioning bracket, and 31 is the connecting structure. 41 is the inlet pipe, and 42 is the outlet pipe. 5 represents the sealing strip. Detailed Implementation

[0009] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0010] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0011] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0012] like Figures 1 to 6 As shown, an immersed lithium battery module includes: The housing 1 has a sealed cavity with an installation space inside. A water-cooled plate 2 is provided at the bottom of the sealed cavity. The water-cooled plate 2 has an inlet pipe and an outlet pipe that pass through the side wall of the housing 1. The inlet pipe and the outlet pipe are sealed to the side wall of the housing 1. Battery module 3 is disposed on the upper wall of water-cooled plate 2. The battery module has a connecting structure extending out of the side wall of housing 1. The connecting structure is sealed to the side wall of housing 1. The connecting structure is a cable or connector. Coolant, which is filled into a sealed cavity, is an insulating material.

[0013] The technical effects of this application; 1. Using a sealed cavity can effectively reduce interference from external foreign objects, improve the stability of the internal structure, and also improve its structural stability; 2. The use of insulating coolant achieves overall cooling of the battery module. The coolant itself possesses high insulation, heat dissipation, thermal conductivity, fire protection, insulation, arc extinguishing, and other related electrical safety characteristics. Examples include fluorinated liquids, novel hydrocarbons, synthetic esters, mineral oils, and silicone oils, thus improving safety in use. 3. The coolant also has fire-retardant properties; 4. Coolant also has a buffering effect, which can effectively reduce resonance during transportation; 5. The inlet and outlet pipes of the water-cooled plate 2 are connected to the cooling circulation pump respectively, thereby achieving active heat dissipation of the coolant and effectively improving the cooling effect of the battery module. The housing 1 consists of a base and a top cover. The upper end of the base is provided with an opening, and a side baffle 200 extends inward from the opening of the base. The top cover is installed on the side panel and is sealed to the opening.

[0014] In the actual design, the base is integrally stamped from a profile, and a sealing ring and sealant are provided between the base and the top cover to ensure the airtightness of the shell 1. Specifically, welding and sealant can be used together to ensure a tight seal.

[0015] Specifically, the base is a rectangular profile with an opening at the top. The rectangular profile has three layers, which are integrally stamped and stacked. The stamping structure can reduce the risk of leakage and ensure the stability of the structure.

[0016] In this embodiment of the invention, a positioning bracket is welded and fixed to the upper wall of the base, and the positioning bracket is used to install the lithium battery module. The positioning bracket is equipped with a hollow channel for cable routing. The use of a built-in hollow channel can reduce cable clutter, improve structural stability, and facilitate standardized design and production, thereby reducing the defect rate of sealed products.

[0017] Specifically, the side wall of the housing 1 is provided with a hole 100, and the hole is provided with a sealing sleeve, which is used for the connection structure, liquid inlet pipe and liquid outlet pipe to pass through.

[0018] Specifically, sealant and limiting structures can be installed to ensure sealing.

[0019] In this embodiment of the invention, the insulating material is a fluorinated liquid, a novel hydrocarbon, a synthetic ester, a mineral oil, or a silicone oil.

[0020] Conventional cooling solutions primarily target the battery, while this immersion structure can cool the tabs (i.e., the current collectors), achieving overall cooling.

[0021] Specifically, Fluorinated fluid: Currently the most widely used immersion coolant, particularly suitable for heat dissipation of data center servers and high-performance computing equipment. Its advantages include insulation and non-conductivity (dielectric constant <2.3), strong chemical inertness and non-corrosiveness to components, and high heat dissipation efficiency, which can reduce the PUE value of data centers to below 1.15, but the cost is relatively high; New types of hydrocarbons: These coolants typically do not contain PFAS, have a high flash point, and are suitable for high temperature and high humidity conditions, achieving a good balance between safety and environmental protection. Synthetic esters: Renowned for their excellent biodegradability and outstanding environmental characteristics. They are typically non-PFAS products, complying with environmental regulations. By selecting specific combinations of alcohols and acids, the molecular structure of esters can be flexibly designed to meet the needs of different liquid cooling operating environments. For example, they possess excellent lubrication properties and low-temperature fluidity, showing potential applications in scenarios such as energy storage battery cooling.

[0022] Mineral oil: It was one of the earliest media used for immersion cooling. Although its cooling efficiency may be slightly inferior to fluorinated fluids, it is less expensive, has a relatively smaller environmental impact, and is easier to handle and recycle. Silicone oil (especially modified silicone oil): As an immersion coolant, modified silicone oil exhibits high thermal conductivity and thermal stability, quickly wetting the surface of electronic components to form a uniform liquid film and improving heat dissipation efficiency. Its excellent insulation ensures the safety of electronic components in direct contact with it. It is chemically stable, compatible with common materials, and non-corrosive. It is typically low in toxicity, VOC-free, environmentally friendly, and has a long lifespan. Its cost advantage is significant, approximately one-tenth that of fluorinated liquids, and its application in energy storage can improve battery cycle life.

[0023] Specifically, the water-cooled plate 2 includes a base plate and a sealing plate disposed on the upper wall of the base plate. The base plate is stamped with recessed flow channels. When the sealing plate is installed on the base plate, the flow channel grooves form a circulation pipe. The circulation pipeline is provided with an inlet pipe and an outlet pipe at both ends.

[0024] Unlike existing designs, the flow channel is formed by direct stamping, resulting in a flatter sealing plate with a larger contact area, which improves heat dissipation. The integrated structure also enhances the overall structural strength of the battery module.

[0025] In this embodiment of the invention, the upper wall of the sealing plate is provided with a thermally conductive pad, which can serve as a buffer and a heat conduction pad.

[0026] Specifically, a sealing strip 5 is provided between the side panel and the top cover.

[0027] In the specific production process 1. Assemble and fix the assembled large single cells into a battery module using steel strips and end plates; 2. Secure the assembled battery module from step 2 to the positioning bracket using bolts; 3. Spot weld the dedicated lithium battery busbars in a specific sequence to complete the module; 4. Run the lithium battery protection board's acquisition cable along the designed bracket cable routing slots; 5. Pour an immersion solution into the base to completely immerse the module's electrical components in the solution; 6. Seal the top cover with screws, and check its airtightness and insulation to complete the process.

[0028] Specifically, Three-piece press-fit structure: The shell is made of profile 1 and fitted with upper and lower end caps. A sealed cavity is formed by tightening a sealing ring with screws. The screw-closed design prevents penetration of the shell, and waterproof adhesive is used to fill the gaps to achieve a complete seal. Micron-level gap control: The joints of the outer shell are manufactured using high-precision molds, and the gap width is controlled at the micron level, effectively preventing dust and moisture from penetrating.

[0029] Application of sealing materials: Silicone rubber sealing rings are embedded in critical interfaces (such as end cap joints) to fill gaps after deformation under pressure; special sealant is used for secondary reinforcement in irregular areas (such as welds).

[0030] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An immersed lithium battery module, characterized in that, include: The housing has a sealed cavity with an installation space inside. A water-cooling plate is provided at the bottom of the sealed cavity. The water-cooling plate has an inlet pipe and an outlet pipe that pass through the side wall of the housing. The inlet pipe and the outlet pipe are sealed to the side wall of the housing. A battery module is mounted on the upper wall of a water-cooling plate. The battery module has a connecting structure extending out of the side wall of the housing. The connecting structure is sealed to the side wall of the housing. The connecting structure is a cable or a connector. Coolant, which is filled into a sealed cavity, and the coolant is an insulating material; The housing consists of a base and a top cover. The upper end of the base is provided with an opening, and a side baffle extends inward from the opening of the base. The top cover is installed on the side baffle and is sealed to the opening; The base is a rectangular profile with an opening at the top. The rectangular profile has three layers, and the three layers of rectangular profile are integrally stamped and stacked. A positioning bracket is welded and fixed to the upper wall of the base. The positioning bracket is used to install the lithium battery module. The positioning bracket is provided with a hollow channel for cable routing; The side wall of the housing is provided with a hole, and the hole is provided with a sealing sleeve. The sealing sleeve is used for the connection structure, liquid inlet pipe and liquid outlet pipe to pass through. The water-cooled plate includes a base plate and a sealing plate disposed on the upper wall of the base plate. The base plate is stamped with recessed flow channels. When the sealing plate is installed on the base plate, the flow channel grooves form a circulation pipe. The circulation pipeline is provided with an inlet pipe and an outlet pipe at both ends; The upper wall of the sealing plate is provided with a heat-conducting pad.

2. The immersed lithium battery module as described in claim 1, characterized in that: The insulating material is a fluorinated liquid, a novel hydrocarbon, a synthetic ester, a mineral oil, or a silicone oil.

3. The immersed lithium battery module as described in claim 1, characterized in that: A sealing strip is provided between the side panel and the top cover.

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