A battery module for preventing gas leakage

Abstract

The utility model belongs to the field of battery thermal management technology, and specifically discloses a battery module that prevents gas blowby. It includes a liquid cooling plate, a side plate, a liquid inlet, a liquid outlet, an exhaust channel, a circulation pipe, a fixed groove, a mounting plate and a heat insulation plate; the liquid cooling plate is provided with the liquid outlet and the liquid inlet at the head end, and the liquid cooling plate is also provided with a plurality of the exhaust channels and a plurality of the fixed grooves, the heat insulation plate is installed in the fixed groove, the mounting is arranged at both ends of the liquid cooling plate, the side plate is installed on both sides of the liquid cooling plate, and the circulation pipe is installed on the back of the liquid cooling plate. In actual use, the utility model cools down the battery cells in the battery module through the circulation pipe, and when the battery cells have thermal runaway, the high-temperature gas can be discharged from the module in time through the exhaust channel to prevent it from affecting other battery cells.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery thermal management, and specifically discloses a battery module for preventing gas blowby. Background Art

[0002] The battery module is a key component in the battery system. It consists of multiple cells connected in a certain way (usually in series and / or parallel) and encapsulated in a common frame or shell to achieve the required voltage, current capacity or energy output. Each cell is the basic storage unit of the battery module, responsible for converting chemical energy into electrical energy.

[0003] A new battery liquid cooling module with patent application number CN219163480U includes a box, a first liquid cooling plate, a second liquid cooling plate and a plurality of battery cells. The first liquid cooling plate and the second liquid cooling plate are respectively arranged on the upper and lower sides of the box, and the battery cells are arranged side by side between the first liquid cooling plate and the second liquid cooling plate. Through this structural design, the liquid cooling effect on the upper and lower sides of the battery cell can be achieved at the same time, avoiding the heat concentration in the middle or top of the battery cell by only using the bottom hot and cold method. While reducing the temperature of the battery cell, the temperature difference between the various parts of the battery cell can be reduced, thereby improving the cycle life of the battery cell. In addition, an explosion-proof valve is provided on the top of the battery cell, and a groove corresponding to the explosion-proof valve is provided on the first liquid cooling plate, so that an exhaust channel is formed between the groove and the explosion-proof valve, and the exhaust channel is used to exhaust the explosion-proof valve. The exhaust channel of the above-mentioned device is arranged on the upper part of the battery cell. When the battery cell fails, the high-temperature gas is discharged from the exhaust channel, which is easy to cause personal injury or fire. In addition, no heat insulation plate is provided between the battery cells of the above-mentioned device, which will affect the adjacent battery cells when a single battery cell is damaged. Therefore, it is urgent for those skilled in the art to solve the above technical problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a battery module that prevents gas blowby in view of the deficiencies of the above-mentioned prior art. The battery module with an exhaust channel liquid cooling plate is provided with an exhaust channel on the liquid cooling plate. When a battery cell fails, due to the effect of the heat insulation plate, the high-temperature gas generated by the failed battery cell can only be discharged from the exhaust channel of the bottom liquid cooling plate, thereby avoiding harm to personnel caused by the high-temperature gas and not affecting adjacent battery cells.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A battery module for preventing gas cross-flow comprises a liquid cooling plate, a side plate, a liquid inlet, a liquid outlet, an exhaust channel, a circulation pipe, a fixing groove, a mounting plate and a heat insulation plate; the liquid cooling plate is provided with the liquid outlet and the liquid inlet at the front end, the liquid cooling plate is also provided with a plurality of the exhaust channels and a plurality of the fixing grooves, the heat insulation plate is installed in the fixing groove, the mounting is arranged at the front and rear ends of the liquid cooling plate, the side plates are installed at both sides of the liquid cooling plate, and the circulation pipe is installed on the back of the liquid cooling plate.

[0007] Furthermore, the exhaust channels are provided in plural numbers and are arranged in a linear array along the length direction of the liquid cooling plate.

[0008] Multiple exhaust channels can more evenly distribute the high-temperature gases generated by the battery cells during thermal runaway, avoid excessive pressure at a certain point or area, thereby reducing the risk of damage to the local structure, and accelerate the discharge of hot gases to effectively control the temperature inside the module. The linear array exhaust channel layout can ensure that the thermal runaway gas is evacuated quickly and directionally, reduce the residence time of the gas inside the module, and reduce the risk of chain reactions caused by contact between adjacent battery cells due to high-temperature gas, thereby improving the overall safety of the battery system. The evenly arranged exhaust channels help to form a stable gas flow pattern, working in conjunction with the cooling system in the battery pack to more effectively remove heat energy, maintain the battery operating within a suitable temperature range, extend battery life and improve performance.

[0009] Furthermore, the fixing grooves are arranged between adjacent exhaust passages, and the number of the fixing grooves is set to be multiple.

[0010] The thermal insulation material installed in each fixed groove can effectively block the heat transfer between adjacent battery cells. Especially when a battery cell experiences thermal runaway, the thermal insulation material combined with the groove design can limit the lateral diffusion of thermal runaway gas and flames, avoiding affecting the adjacent battery cells, thereby slowing down or preventing the spread of the thermal runaway chain reaction. The combination of the fixed groove and the thermal insulation material not only plays a role in thermal insulation, but also enhances the overall structural stability of the battery module. The groove design allows the insulation board or other reinforcement to be fixed more firmly, so that the module is not easily deformed when subjected to external impact or vibration, thereby improving the durability of the battery system. Through the pre-set multiple fixed grooves, the insulation material can be accurately positioned and installed during the assembly process to ensure that the insulation measures between each battery cell are in place, thereby improving production efficiency and assembly accuracy and reducing assembly errors caused by improper manual operation. The fixed grooves in the design make it easier to remove or replace the insulation material during maintenance or future upgrades without having to disassemble the module on a large scale, thereby reducing maintenance costs and complexity and improving the convenience of after-sales service. According to the structure and thermal management requirements of different battery modules, the size and shape of the insulation material can be flexibly designed by adjusting the number and layout of the fixed grooves to adapt to different battery cell arrangements and power requirements, thereby improving the flexibility of the design and the scope of application.

[0011] Furthermore, the liquid outlet and the liquid inlet are connected to the circulation pipeline.

[0012] Through the circulation pipe, the coolant can circulate inside the liquid cold plate, enter from the liquid inlet, absorb the heat generated by the battery cell when it is working, and then be discharged through the liquid outlet, continuously taking the heat out of the module, realizing an efficient heat exchange process. This can effectively control the operating temperature of the battery and avoid performance degradation or safety risks caused by overheating. The circulating coolant can ensure that the temperature of each part of the liquid cold plate is uniform, and there will be no local overheating, which is conducive to extending the life of the battery cell and stabilizing the output of battery performance. Especially in high-power output or fast charging scenarios, this heat dissipation mechanism is particularly important. The design of the inlet and outlet of the circulation pipe makes the entire cooling system more flexible. The flow and pressure of the circulation pump can be adjusted according to the heat load requirements of different battery cell arrangements and modules, and the appropriate cooling medium can be selected to achieve the best thermal management effect.

[0013] Furthermore, a fixing foot is provided at the bottom of the heat insulation board, and the fixing foot is matched with the fixing groove.

[0014] The matching design of the fixed feet and the grooves ensures the precise position of the insulation board during installation, avoiding the problem of poor insulation effect or unstable structure caused by inaccurate positioning. This ensures that the insulation material is always in the most effective insulation position, giving full play to its role in isolating the heat source from the surrounding environment. The feet provide additional support points, which enhances the stability of the insulation board under stress, especially when the battery cell is thermally runaway, and can effectively resist the displacement caused by high-temperature gas or pressure, protecting the battery cell from the influence of adjacent heat sources. Through the simple snap-on design of the feet and the grooves, the assembly process becomes simpler and faster. Workers only need to align to quickly install, which reduces the difficulty of operation, improves production efficiency, and also reduces the possibility of assembly errors.

[0015] Furthermore, the fixing legs are bonded in the fixing grooves by means of heat-conducting structural adhesive.

[0016] The thermal conductive structural adhesive has strong bonding properties, and can firmly bond the fixed legs of the heat insulation board to the fixed grooves of the liquid cooling plate. Even in an environment of long-term vibration or extreme temperature changes, it can maintain good connection stability, ensuring that the position of the heat insulation board is fixed and will not loosen or fall off. In addition to the bonding function, the thermal conductive structural adhesive also has certain thermal conductivity, which can assist in heat dissipation and help transfer the heat generated by the battery cell to the liquid cooling plate. The heat is effectively dissipated through the cooling system, reducing heat accumulation and further improving the thermal management efficiency of the battery module. Compared with traditional connection methods such as mechanical fixation or welding, it Bonding with thermally conductive structural adhesive is simpler and faster, reduces assembly steps, reduces assembly complexity and cost, and also avoids metal fatigue or heat-affected zone problems that may be caused by welding. If the insulation board needs to be replaced or repaired, the thermally conductive structural adhesive is easier to remove and re-bond than other fixing methods, which facilitates subsequent maintenance operations and reduces the risk of damage to the module. The use of thermally conductive structural adhesive can also effectively fill the tiny gaps between the fixing legs and the grooves, forming a good sealing effect, preventing gas or flames from passing through these gaps during thermal runaway, thereby improving the safety of the battery module.

[0017] The utility model has the following beneficial effects:

[0018] 1. Multiple cells connected in series are isolated by heat insulation plates. The fixed legs at the bottom of the heat insulation plates are adapted to the fixed grooves, and are sealed and bonded by heat-conductive structural adhesive to seal each cell in an independent space. High-temperature gas from a single cell failure will only be discharged from the exhaust channel of the bottom liquid cooling plate, without affecting adjacent cells.

[0019] 2. A circulation pipe is set at the bottom of the liquid cooling plate. The coolant entering through the liquid outlet can cool the battery cells set on the liquid cooling plate, ensuring that the battery cells are at a relatively normal temperature, further reducing the impact of excessive temperature on the battery cells. The coolant discharged through the liquid outlet can be recycled and reused, thereby improving the utilization rate of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an explosion schematic diagram of the utility model.

[0021] Figure 2 It is a top view of the liquid cooling plate of the utility model.

[0022] Figure 3 It is a bottom view of the liquid cooling plate of the utility model.

[0023] Figure 4 It is a structural schematic diagram of the utility model heat insulation board.

[0024] Figure 5 It is an installation schematic diagram of the utility model.

[0025] The components include: 1-liquid cooling plate; 11-fixing groove; 12-exhaust channel; 2-mounting plate; 3-side plate; 4-liquid outlet; 5-liquid inlet; 6-circulation pipe; 7-insulation plate; and 71-fixing foot. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0027] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not indicate the importance of the components, and therefore cannot be understood as a limitation on the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0028] Reference Figure 1 and Figure 5 It can be seen that a battery module for preventing gas cross-flow includes a liquid cooling plate 1 located at the bottom, a plurality of exhaust channels 12 are arranged on the liquid cooling plate 1 in a linear array along the length direction of the liquid cooling plate 1, and a fixing groove 11 is arranged between the exhaust channels 12 adjacent to each other, side plates 3 are arranged on both sides of the liquid cooling plate 1, mounting plates 2 are arranged at both ends of the liquid cooling plate 1, a heat insulation plate 7 is arranged on the fixing groove 11 of the liquid cooling plate, and a circulation pipeline is arranged at the bottom of the liquid cooling plate 1.

[0029] In one embodiment, the circulation pipe 6 is fixed to the bottom of the liquid cooling plate 1 to ensure that it is correctly connected with the liquid inlet 5 and the liquid outlet 4, and sealing measures are taken. The circulation pipe 6 can be made of stainless steel. The liquid cooling plate 1 is positioned, opened and grooved using a tool to ensure that the exhaust channel 12 and the fixed groove 11 are arranged neatly according to the design layout, and the exhaust channel 12 on the liquid cooling plate 1 is matched with the reserved interface of the exhaust system of the battery pack to prepare for subsequent gas discharge. A proper amount of thermal conductive structural glue is applied to the fixed groove 11, and then the fixed leg 71 of the heat insulation plate 7 is aligned with the fixed groove 11 and pressed in to ensure that the two are tightly combined. The protruding part of the heat insulation plate 7 should be in the gap reserved between the battery cells. The battery cells are stacked in a preset order and tooling requirements, and the double-sided adhesive thermal insulation material is pasted between the battery cells to make them in contact with the thermal insulation board 7. After stacking, the module is extruded to a predetermined size using tooling to ensure that each layer of battery cells fits tightly with the thermal insulation board 7. The thermal insulation material is installed in place, and the side panel 3 is connected to the side of the liquid cooling plate 1 by means of snap-fit ​​or screws to ensure a stable structure. The mounting plate 2 is installed at the head and tail ends of the liquid cooling plate 1 and fixed by welding or screws to complete the closure of the module. A conventional liquid cooling plate with an explosion-proof valve is provided on the top of the module (the liquid cooling plate on the top of the battery module is prior art and will not be described here).

[0030] Reference Figure 2 and Figure 3 It can be seen that a plurality of exhaust channels 12 and fixing grooves 11 are provided on the liquid cooling plate 1. The number of the exhaust channels 12 and the fixing grooves 11 can be set according to the number of battery cells. A circulation pipe 6 is arranged at the bottom of the liquid cooling plate 1. The outer circle circulation pipe 6 is connected to the inner circle circulation pipe 6 to ensure that the coolant flows between the inner circle circulation pipe 6 and the outer circle circulation pipe 6.

[0031] In one embodiment, the arrangement mode (such as parallel, series or mixed connection) and quantity of the battery cells are first determined according to the overall design requirements of the battery module, which directly affects the design layout of the exhaust channel 12 and the fixed groove 11 on the liquid cooling plate 1. According to the layout of the battery cells, the size and shape of the liquid cooling plate are designed to ensure that the number of the exhaust channels 12 and the fixed grooves 11 match the positions of the battery cells to optimize the heat dissipation and heat insulation effects. The exhaust channels 12 are designed as a linear array and distributed along the length direction of the liquid cooling plate 1 to facilitate the rapid discharge of thermal runaway gases. The fixed grooves 11 are designed between adjacent exhaust channels for installing heat insulation 7 to ensure effective isolation between the battery cells. A double-layer circulation pipe 6 is designed at the bottom, and the inner and outer circles are connected. The cooling plate 1 is made of aluminum alloy or stainless steel through stamping, casting or extrusion to ensure the accurate forming of the exhaust channel 12 and the fixed groove 11. The circulation pipe 6 is integrated or welded at the bottom of the liquid cooling plate to ensure the connection between the inner and outer circles. Special insulation materials are prepared to ensure that the size of the fixed groove 11 is consistent with that of the fixed groove 11 for easy installation. The insulation plate is fixed in the groove with thermal conductive structural adhesive or double-sided adhesive to ensure airtightness and good insulation effect. The liquid cooling plate 1 is assembled with the battery cell and other components of the module to ensure that the exhaust channel 12 is aligned with the battery cell explosion-proof valve. The circulation pump and the radiator are connected to ensure that the circulation pipe 6 is fully connected to the external cooling system.

[0032] Reference Figure 4 It can be seen that the heat insulation board 7 is a rectangular structure as a whole, and a fixed support leg 71 is provided at the bottom of the heat insulation board.

[0033] In one embodiment, the size and shape of the heat insulation board 7 are designed according to the specific requirements of the battery module to ensure that it matches the fixed groove 11 on the liquid cooling plate 1. Suitable heat insulation materials are selected, such as silicate, rock wool, aerogel, high molecular weight polyolefin foam, etc., which must meet the requirements of flame retardancy, light weight, and high efficiency heat insulation performance. The mold is made based on a rectangular structure to ensure that the size of the heat insulation board 7 is accurate. The structure of the bottom fixed support leg 71 is considered when designing the mold. The heat insulation material is injected into the mold. If it is a porous material, ensure that the pores are evenly distributed; if it is a continuous material, the density and shape need to be controlled. The formed heat insulation board 7 is taken out of the mold and accurately cut according to the designed size to ensure that the edges are straight and the size meets the requirements. The fixed support leg 71 and the heat insulation board 7 are cast as one piece. The surface of the heat insulation board is treated, such as applying a moisture-proof and fire-proof coating to improve its long-term performance in the battery environment.

[0034] During installation, apply thermal conductive structural glue in the fixed groove 11 of the liquid cooling plate 1 to ensure that it is firmly bonded to the fixed leg 71, align the fixed leg 71 of the insulation plate 7 with the fixed groove 11 on the liquid cooling plate, and press gently to ensure that the fixed leg 71 is tightly combined with the fixed groove 11, and the glue fully overflows to fill the gap.

[0035] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A battery module for preventing gas leakage, characterized in that: It includes a liquid cooling plate, a side plate, a liquid inlet, a liquid outlet, an exhaust channel, a circulation pipe, a fixing groove, a mounting plate and a heat insulation plate; the liquid cooling plate is provided with the liquid outlet and the liquid inlet at the front end, and the liquid cooling plate is also provided with a plurality of the exhaust channels and a plurality of the fixing grooves, the heat insulation plate is installed in the fixing groove, the mounting is arranged at the front and rear ends of the liquid cooling plate, the side plates are installed on both sides of the liquid cooling plate, and the circulation pipe is installed on the back of the liquid cooling plate.

2. A battery module for preventing gas leakage according to claim 1, characterized in that: The exhaust channels are arranged in a plurality and arranged in a linear array along the length direction of the liquid cooling plate.

3. A battery module for preventing gas leakage according to claim 1, characterized in that: The fixing grooves are arranged between adjacent exhaust passages, and the number of the fixing grooves is plural.

4. A battery module for preventing gas leakage according to claim 1, characterized in that: The liquid outlet and the liquid inlet are connected to the circulation pipeline.

5. A battery module for preventing gas leakage according to claim 1, characterized in that: The bottom of the heat insulation board is also provided with a fixed support foot, and the fixed support foot is adapted to the fixed groove.

6. A battery module for preventing gas leakage according to claim 5, characterized in that: The fixing legs are bonded in the fixing grooves by means of heat-conducting structural adhesive.

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