Immersed battery cell sealing structure, power battery and vehicle

Abstract

The utility model relates to a power battery of a vehicle, in particular to an immersed battery cell sealing structure, a power battery and a vehicle, the immersed battery cell sealing structure comprises a tray, the tray is provided with a plurality of accommodating grooves corresponding to battery cells of a battery module in position; an avoiding hole corresponding to the pressure relief element at the bottom of the battery cell is formed in the bottom of the accommodating groove; an isolation ring is arranged between the bottom of the accommodating groove and the bottom of the battery cell; the avoiding hole is formed in the inner side of the isolation ring; a sealing structural adhesive is arranged at the bottom of the battery cell in the outer side area of the isolation ring and / or between the side wall of the battery cell and the accommodating groove, and the sealing structural adhesive is arranged around the isolation ring or the side wall of the battery cell. The device can ensure the sealing and fixing of the battery cell, realizes the thermoelectric separation of the battery cell, realizes directional eruption when the battery cell is in thermal runaway, and avoids the thermal runaway spreading phenomenon.

Description

Technical Field

[0001] This utility model relates to the power battery of a vehicle, specifically to an immersion cell sealing structure, a power battery, and a vehicle. Background Technology

[0002] Battery packs use cylindrical cells. Due to the internal resistance of these cells, heat is generated during charging and discharging. Some of this heat is used to raise the cell's own temperature, while some is radiated into the environment, raising the ambient temperature. Under high-current charging and discharging conditions, the battery pack generates significant heat, causing the cell temperature to exceed its permissible operating range. Therefore, thermal management within the battery pack is crucial. Traditionally, cylindrical cells are cooled using serpentine tubes. However, due to manufacturing difficulties, the contact area between the serpentine tube and the cylindrical cell is small, resulting in low heat exchange efficiency. To address this issue, the industry has proposed immersion cooling, allowing direct contact between the cell and the heat exchange fluid, increasing the heat exchange area, improving heat transfer efficiency, and enabling the cell to charge and discharge under high current. However, for cylindrical cells, most explosion-proof valves for large cylindrical cells are currently located at the bottom. The supporting and fixing structure of the cell must avoid these valves, leaving a thermal runaway gas protection channel to achieve thermoelectric separation in the event of thermal runaway. This avoidance structure presents challenges to the sealing structure of immersion cooling for cylindrical cells.

[0003] CN219086169U discloses a battery system integrating cylindrical cells. The bottom protective plate of the battery casing has at least one cell positioning component, consisting of several grooves arranged in a matrix. Each groove contains a vertically placed cell secured with adhesive. This structure, which uses structural adhesive to fix the cylindrical cells to the cell positioning components and the bottom of the casing, is only suitable for designs where the explosion-proof valve for the cylindrical cells is located at the top. In the event of thermal runaway, it cannot achieve thermoelectric separation, posing a significant safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide an immersion-type cell sealing structure, a power battery, and a vehicle, which can ensure the cell is sealed and fixed, achieve thermoelectric separation of the cell, and enable directional ejection in the event of thermal runaway, thus avoiding the spread of thermal runaway.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, this utility model discloses an immersion-type battery cell sealing structure, including a tray. The tray has a plurality of receiving grooves corresponding to the positions of the battery cells in the battery module. The bottom of the receiving groove has clearance holes corresponding to the pressure relief elements at the bottom of the battery cell. An isolation ring is provided between the bottom of the receiving groove and the bottom of the battery cell, and the clearance holes are located inside the isolation ring. A sealing structural adhesive is provided between the bottom of the battery cell in the area outside the isolation ring and / or between the side wall of the battery cell and the receiving groove. The sealing structural adhesive is provided around the side wall of the battery cell or the isolation ring.

[0007] Furthermore, the bottom of the receiving groove has an annular groove corresponding to the insulating ring in the area outside the clearance hole. The top of the insulating ring protrudes from the annular groove, and the top of the insulating ring is interference-fitted with the bottom of the battery cell.

[0008] Furthermore, the bottom end of the insulating ring is fixedly connected to the bottom of the receiving groove, and the top of the insulating ring is interference-fitted with the bottom of the battery cell.

[0009] Furthermore, the isolation ring and the tray are integrally injection molded, with the tray being a rigid component and the isolation ring being a flexible component.

[0010] Furthermore, the pressure relief element at the bottom of the battery cell is an explosion-proof valve.

[0011] Furthermore, several receiving slots are arranged in an array on the tray.

[0012] Furthermore, a sealing structural adhesive is provided at the bottom of the battery cell between the outer region of the insulating ring and the receiving groove, and the area covered by the sealing structural adhesive is not less than a first preset threshold.

[0013] Furthermore, a sealing structural adhesive is provided between the sidewall of the battery cell and the receiving groove, and the area covered by the sealing structural adhesive is not less than a second preset threshold.

[0014] Secondly, this utility model discloses a power battery, including the above-mentioned immersion cell sealing structure.

[0015] Thirdly, this utility model discloses a vehicle including the aforementioned power battery.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model, by setting an isolation ring between the bottom of the receiving groove and the bottom of the battery cell, with a clearance hole located inside the isolation ring, and a sealing structural adhesive set between the bottom of the battery cell located outside the isolation ring and / or between the battery cell sidewall and the receiving groove, ensures a stable connection between the battery cell and the receiving groove, preventing the battery cell from shaking in the receiving groove. Furthermore, when using an immersion cooling method, the battery pack cavity can be directly filled with coolant. By selecting a type of sealing structural adhesive compatible with the coolant, the sealing effect of a single battery cell can be achieved, preventing coolant leakage without affecting the opening of the battery cell's pressure relief element. This meets the sealing requirements of immersion coolant for batteries with pressure relief elements located at the bottom. The isolation ring effectively prevents the sealing structural adhesive from overflowing into the clearance hole during adhesive application, thus affecting assembly quality.

[0018] 2. This utility model provides a clearance hole at the bottom of the receiving groove that corresponds to the pressure relief element at the bottom of the battery cell, thereby physically separating the pressure relief element of the battery cell from the high and low voltage electrical equipment. In the event of thermal runaway of the battery cell, it can achieve directional ejection, which can physically separate the area of ​​thermal runaway material ejection from the high and low voltage wiring harness area, avoiding the situation where the ejected material causes arcing, short circuits and insulation failure, and thus prevents the spread of thermal runaway. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model.

[0020] Figure 1 A schematic diagram of the structure of the tray according to an embodiment of the present invention is shown;

[0021] Figure 2 yes Figure 1 AA section view;

[0022] Figure 3 This is one of the schematic diagrams showing the arrangement of the isolation ring described in this utility model;

[0023] Figure 4 This is the second schematic diagram of the arrangement of the isolation ring described in this utility model.

[0024] In the diagram, 1—tray, 11—accommodating groove, 12—avoidance hole, 13—annular groove, 2—battery cell, 3—insulating ring, and 4—sealant. Detailed Implementation

[0025] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0027] In one embodiment, see Figures 1 to 3 As shown, this utility model discloses an immersion-type battery cell sealing structure, including a tray 1. The tray 1 is provided with a plurality of receiving grooves 11 corresponding to the positions of the battery cells 2 in the battery module. The receiving grooves 11 on the tray 1 are used to fix and support the battery cells 2. The bottom of the receiving grooves 11 is provided with clearance holes 12 corresponding to the pressure relief elements at the bottom of the battery cells 2, ensuring that the battery cells 2 can be depressurized smoothly under normal operation or abnormal conditions without being obstructed by the structure of the tray 1.

[0028] An isolation ring 3 is provided between the bottom of the receiving groove 11 and the bottom of the battery cell 2, and the clearance hole 12 is located inside the isolation ring 3. The main function of the isolation ring 3 is to provide a physical barrier to prevent the sealing adhesive 4 from directly contacting the pressure relief element at the bottom of the battery cell 2, thereby ensuring the normal functioning of the pressure relief function. A sealing adhesive 4 is provided between the bottom of the battery cell 2, located outside the isolation ring 3, and / or between the side wall of the battery cell 2 and the receiving groove 11. The function of the sealing adhesive 4 is to prevent the cooling liquid in the immersion cooling system from seeping into the clearance hole 12 and causing leakage, ensuring the safe operation of the battery cell 2. Furthermore, the sealing adhesive 4 is arranged around the side wall of the battery cell 2 or the isolation ring 3, forming a continuous sealing layer, effectively preventing the penetration and leakage of cooling liquid.

[0029] This invention provides a barrier ring 3 between the bottom of the receiving groove 11 and the bottom of the battery cell 2, with a clearance hole 12 located inside the barrier ring 3. A sealing adhesive 4 is provided between the bottom of the battery cell 2, located outside the barrier ring 3, and / or between the side wall of the battery cell 2 and the receiving groove 11. This ensures a stable connection between the battery cell 2 and the receiving groove 11, preventing the battery cell 2 from shaking within the receiving groove 11. Furthermore, when using an immersion cooling method, the battery pack cavity can be directly filled with coolant. By selecting a type of sealing adhesive 4 compatible with the coolant, the sealing effect of a single battery cell can be achieved, preventing coolant leakage without affecting the opening of the cell's pressure relief element. This meets the sealing requirements for immersion cooling of cells with pressure relief elements located at the bottom. The barrier ring 3 effectively prevents the sealing adhesive 4 from overflowing into the clearance hole 12 during adhesive application, thus preventing it from affecting assembly quality.

[0030] This invention provides a clearance hole 12 at the bottom of the receiving groove 11, corresponding to the pressure relief element at the bottom of the battery cell 2, which physically separates the pressure relief element of the battery cell 2 from the high and low voltage electrical equipment. In the event of thermal runaway of the battery cell 2, it enables directional ejection, which can physically separate the area of ​​thermal runaway material ejection from the high and low voltage wiring harness area, avoiding the situation where the ejected material causes arcing, short circuits and insulation failure, thus preventing the spread of thermal runaway.

[0031] The immersion cell sealing structure of this utility model achieves effective sealing and fixation of the cell 2 in the immersion cooling system through the ingenious design of the combination of tray 1, clearance hole 12, isolation ring 3 and sealing structure adhesive 4. This not only ensures the normal operation and pressure relief function of the cell 2, but also improves the safety and reliability of the battery module.

[0032] As a preferred embodiment of this utility model, see [link to relevant documentation]. Figure 3 As shown, the bottom of the receiving groove 11 is provided with an annular groove 13 corresponding to the isolation ring 3 in the area outside the clearance hole 12. The top of the isolation ring 3 protrudes from the annular groove 13, and the top of the isolation ring 3 is interference-fitted with the bottom of the battery cell 2.

[0033] The size and shape of the annular groove 13 match that of the insulating ring 3, serving to accommodate and secure the insulating ring 3. The top of the insulating ring 3 is designed to protrude from the annular groove 13. This design ensures a clear contact surface between the insulating ring 3 and the bottom of the battery cell 2, while also providing stable support for the battery cell 2. More importantly, an interference fit is achieved between the top of the insulating ring 3 and the bottom of the battery cell 2. An interference fit refers to a certain amount of interference between the mating surfaces of two parts, meaning the dimensional difference between the mating surfaces is greater than zero. This fit provides a tight connection, preventing the battery cell 2 from moving under vibration or impact conditions, and also acts as a sealant, further preventing the sealant 4 from overflowing into the clearance hole 12.

[0034] Through the coordinated design of the annular groove 13 and the isolation ring 3, this utility model not only achieves stable fixation of the battery cell 2 in the receiving groove 11, but also enhances the sealing performance between the battery cell 2 and the isolation ring 3 through interference fit, further improving the reliability and safety of the immersion battery cell sealing structure, ensuring that the battery cell 2 can operate stably in the immersion cooling system, while preventing the coolant from penetrating into the interior of the battery cell 2.

[0035] As a preferred embodiment of this utility model, see [link to relevant documentation]. Figure 4 As shown, the bottom end of the insulating ring 3 is fixedly connected to the bottom of the receiving groove 11, and the top of the insulating ring 3 is interference-fitted with the bottom of the battery cell 2.

[0036] The bottom end of the insulating ring 3 is designed to be fixedly connected to the bottom of the receiving groove 11. This fixed connection can be achieved in various ways, such as integral molding or using adhesives, welding, mechanical locking, etc. The fixed connection ensures the stability of the insulating ring 3 in the receiving groove 11 and prevents it from moving or deforming during the installation or use of the battery cell 2.

[0037] As mentioned above, an interference fit is achieved between the top of the insulating ring 3 and the bottom of the cell 2. This fit ensures that the cell 2 can be tightly fixed in the receiving groove 11 during installation, while providing an additional sealing effect to prevent coolant or other impurities from penetrating into the cell 2.

[0038] Through the fixed connection between the bottom end of the insulating ring 3 and the bottom of the receiving groove 11, and the interference fit between the top of the insulating ring 3 and the bottom of the battery cell 2, the immersion-type battery cell sealing structure of this utility model achieves a higher level in terms of battery cell fixation, support, and sealing. This not only improves the stability and safety of the battery cell 2 in the immersion cooling system, but also ensures that the battery module can operate reliably for a long time.

[0039] Further, see Figure 4 As shown, the insulating ring 3 and the tray 1 are integrally injection molded. The tray 1 is a rigid component, and the insulating ring 3 is a flexible component. Integral injection molding is a plastic processing technology that allows for the one-time molding of various plastic materials (or plastics combined with other materials) in a mold to create parts with complex structures and functions. In this manufacturing method, there is no independent connecting interface between the insulating ring 3 and the tray 1; instead, they form a single, integrated structure. This design not only improves the strength and stability of the structure but also simplifies the manufacturing process and reduces costs.

[0040] The tray 1 is designed as a rigid component, meaning it has high strength and rigidity, providing stable support and protection for the battery cell 2. The insulating ring 3 is designed as a flexible component, with lower hardness and better elasticity. This design allows the insulating ring 3 to better adapt to changes in the shape and size of the bottom of the battery cell 2, while providing sufficient sealing pressure to ensure a good seal between the battery cell 2 and the tray 1.

[0041] By adopting integrated injection molding technology and a combination of soft and hard materials, the immersion cell sealing structure of this utility model has significantly improved in terms of manufacturing efficiency and performance. It not only simplifies the manufacturing process and reduces costs, but also improves the fixing, support and sealing effect of the cell 2, providing a strong guarantee for the safe operation of the battery module.

[0042] In a preferred embodiment of this invention, the pressure relief element at the bottom of the battery cell 2 is an explosion-proof valve. The explosion-proof valve is a safety device that can quickly open and release internal pressure when the internal pressure of the battery cell 2 abnormally increases, thereby preventing the battery cell 2 from exploding or rupturing. The explosion-proof valve is positioned corresponding to the clearance hole of the isolation ring, ensuring that when the explosion-proof valve is operating, coolant or other impurities will not penetrate into the battery cell 2 through the clearance hole 12. Simultaneously, the interference fit design between the top of the isolation ring 3 and the bottom of the battery cell 2 provides additional sealing, further enhancing the sealing performance of the battery cell 2.

[0043] By using an explosion-proof valve as a pressure relief element at the bottom of the battery cell 2, the safety of the immersion-type battery cell sealing structure of this utility model is significantly improved. It can not only provide an effective pressure relief path when the internal pressure of the battery cell 2 is abnormal, but also prevent the battery cell 2 from being damaged due to excessive pressure, thereby extending the service life of the battery cell 2 and improving the overall performance of the battery module.

[0044] As a preferred embodiment of this utility model, see [link to relevant documentation]. Figure 1 As shown, several receiving slots 11 are arranged in an array on the tray 1. In this preferred embodiment, the receiving slots 11 on the tray 1 are not randomly arranged, but are arranged in an array according to a certain rule or pattern (such as rectangles, hexagons, etc.). This layout allows the tray 1 to make efficient use of space, while ensuring that each battery cell 2 can obtain uniform support and sealing effect.

[0045] The array-style distribution also facilitates the assembly and maintenance of the battery module. Since the position of the cells is fixed, they can be easily installed or removed without worrying about their relative positions. Furthermore, this layout makes the battery module more stable and safer during transportation and storage.

[0046] By adopting an array-distributed receiving groove 11 design, the immersion cell sealing structure of this utility model has been significantly improved in terms of space utilization, cell support, sealing effect, and battery module assembly and maintenance. It not only improves the overall performance of the battery module, but also reduces manufacturing costs and maintenance difficulty.

[0047] In a preferred embodiment of the present invention, a sealing structural adhesive 4 is provided at the bottom of the battery cell 2 between the outer region of the insulating ring 3 and the receiving groove 11, which is intended to prevent cooling liquid or other impurities from penetrating into the battery cell through the gap between the bottom of the battery cell and the receiving groove.

[0048] To ensure a good seal, the area covered by the sealing adhesive 4 is set to be no less than a first preset threshold, ensuring that the battery cell receives sufficient sealing protection in most cases. For example, the first preset threshold is 45% of the bottom area of ​​the battery cell. This ratio is derived from in-depth analysis and experimental verification of the battery cell's sealing performance requirements.

[0049] In a preferred embodiment of this utility model, a sealing structural adhesive 4 is provided between the sidewall of the battery cell 2 and the receiving groove 11. To ensure a sealing effect, the coverage area of ​​the sealing structural adhesive 4 is set to be no less than a second preset threshold, aiming to ensure that the sidewall of the battery cell 2 also receives sufficient sealing protection. For example, the second preset threshold is 10% of the area of ​​the sidewall of the battery cell.

[0050] By quantifying the coverage area of ​​the sealing adhesive 4, the immersion cell sealing structure of this invention achieves more precise control and optimization in terms of sealing effect. This not only improves the sealing performance of the cell 2 but also reduces potential risks caused by poor sealing, providing strong protection for the safe operation of the battery module.

[0051] In one embodiment, the present invention discloses a power battery, including the immersion cell sealing structure provided in any of the above embodiments.

[0052] In one embodiment, the present invention discloses a vehicle including the power battery provided in the above embodiment.

[0053] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A submersible cell sealing structure, characterized in that: Includes a tray (1), on which are provided a plurality of receiving slots (11) corresponding to the positions of the battery cells (2) of the battery module, and the bottom of the receiving slots (11) is provided with clearance holes (12) corresponding to the pressure relief elements at the bottom of the battery cells. An isolation ring (3) is provided between the bottom of the receiving groove (11) and the bottom of the battery cell (2), and the clearance hole (12) is located inside the isolation ring (3); The bottom of the cell (2) is located in the area outside the insulating ring (3) and / or the side wall of the cell (2) is provided with a sealing structural adhesive (4) between the receiving groove (11) and the sealing structural adhesive (4) is provided around the side wall of the cell (2) or the insulating ring (3).

2. The immersion cell sealing structure according to claim 1, characterized in that: The bottom of the receiving groove (11) is provided with an annular groove (13) corresponding to the isolation ring (3) in the area outside the clearance hole (12). The top of the isolation ring (3) protrudes from the annular groove (13), and the top of the isolation ring (3) is interference-fitted with the bottom of the battery cell (2).

3. The immersion cell sealing structure according to claim 1, characterized in that: The bottom end of the isolation ring (3) is fixedly connected to the bottom of the receiving groove (11), and the top of the isolation ring (3) is interference-fitted with the bottom of the battery cell (2).

4. The immersion cell sealing structure according to claim 3, characterized in that: The isolation ring (3) and the tray (1) are integrally injection molded. The tray (1) is a rigid part and the isolation ring (3) is a soft part.

5. The immersion cell sealing structure according to claim 1, characterized in that: The pressure relief element at the bottom of the battery cell (2) is an explosion-proof valve.

6. The immersion cell sealing structure according to claim 1, characterized in that: Several receiving slots (11) are arranged in an array on the tray (1).

7. The immersion cell sealing structure according to claim 1, characterized in that: The bottom of the battery cell (2) is provided with a sealing structural adhesive (4) between the outer area of ​​the insulating ring (3) and the receiving groove (11), and the area covered by the sealing structural adhesive (4) is not less than the first preset threshold.

8. The immersion cell sealing structure according to claim 1, characterized in that: A sealing structural adhesive (4) is provided between the side wall of the battery cell (2) and the receiving groove (11), and the area covered by the sealing structural adhesive (4) is not less than the second preset threshold.

9. A power battery, characterized in that: Including the immersion cell sealing structure as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: Includes the power battery as described in claim 9.

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