Battery module assembly and battery pack

Abstract

The utility model belongs to the battery field, concretely is a kind of battery module assembly and battery package.Overcome the problem that the thermal runaway of single battery of battery module may affect other single battery, to cause more serious security risk problem.Battery module assembly, including battery module and flue gas busbar;Battery module includes n single battery;N first through holes are set up on the pipe wall of flue gas busbar;Flue gas busbar is fixed on battery module, and n first through holes and n single battery on the corresponding communication of explosion venting part one by one;Sealing adhesive layer is equipped between flue gas busbar and each single battery, realize the sealing communication of each first through hole and corresponding explosion venting part, ensure that the thermal runaway flue gas of single battery can only be discharged from the smoke outlet of flue gas busbar, avoid the spread of thermal runaway flue gas in battery module.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, specifically a battery module assembly and a battery pack. Background Technology

[0002] Currently, most common battery modules are composed of multiple individual battery cells connected together electrically.

[0003] Fire protection of battery modules has always been a hot topic of concern in this field. During the operation of a battery module, any single cell may experience diaphragm collapse and internal short circuit due to factors such as overcharging, over-discharging, overheating, or mechanical collisions, leading to thermal runaway. The resulting thermal runaway fumes can spread within the battery module, potentially causing thermal runaway risks in other single cells and resulting in more serious safety hazards. Summary of the Invention

[0004] The purpose of this utility model is to provide a battery module assembly and battery pack. By setting a vent pipe on the battery module, thermal runaway fumes can be discharged in an orderly manner, overcoming the problem that thermal runaway of a single battery cell may affect other single batteries, thereby causing more serious safety hazards.

[0005] The first aspect of this utility model provides a battery module assembly, including a battery module and a flue gas manifold;

[0006] The aforementioned battery module includes n individual battery cells arranged along a first direction, where n is an integer greater than 1;

[0007] The flue gas manifold is provided with a flue gas outlet, and the pipe wall of the flue gas manifold is provided with n first through holes arranged at intervals along the first direction.

[0008] The aforementioned flue gas manifold extends along the first direction and is fixed on the battery module. The n first through holes are connected to the explosion venting parts on the n individual batteries one by one.

[0009] A sealing layer is provided between the flue gas manifold and each individual battery cell to achieve a sealed connection between each first through hole and the corresponding explosion relief part, ensuring that the thermal runaway flue gas of the individual battery cell can only be discharged from the flue gas manifold outlet.

[0010] This invention, based on a sealing layer, can effectively prevent thermal runaway gas from leaking from the gap between the gas manifold and the individual battery cells. The gas manifold allows for the orderly discharge of thermal runaway gas, preventing it from spreading within the battery module and improving the safety of the battery module after thermal runaway.

[0011] Compared to welding, using a sealing layer to achieve a sealed connection not only makes the installation of the flue gas manifold simpler and the manufacturing cost lower, but also avoids potential damage to the internal structure of the individual battery cells caused by the high temperature of welding; at the same time, it can directly improve the thermal runaway safety of the original battery module without modifying other structures.

[0012] Furthermore, the aforementioned flue gas manifold is fixed to the battery module based on a sealing layer. This novel sealing layer effectively prevents thermal runaway flue gas from leaking through the gap between the flue gas manifold and the individual battery cells, while also securing the flue gas manifold without requiring additional fixing structures. This significantly simplifies the overall assembly process and reduces the structural complexity of the battery module components, resulting in lower costs.

[0013] This utility model can employ the following two types of sealant layers:

[0014] The first structure: the size of the sealing layer is adapted to the contact surface between the flue gas manifold and each individual battery cell, allowing the sealing layer to fill the entire contact interface, forming a continuous and uninterrupted sealing barrier, ensuring that the flue gas enters the flue gas manifold only through the first through hole and is finally discharged from the flue gas outlet.

[0015] The second structure: The sealant layer includes n annular sub-sealant layers, each annular sub-sealant layer corresponding to one of the n first through holes and n explosion venting parts; the area enclosed by each annular sub-sealant layer is projected onto the flue gas manifold and completely covers the corresponding first through hole; the area enclosed by each annular sealant layer is projected onto the individual battery and completely covers the corresponding explosion venting part.

[0016] The projection of the annular sealing layer completely covers the first through hole and the explosion vent. The sealing layer precisely surrounds the outer periphery of the first through hole and the explosion vent, which can completely block the leakage of flue gas from the gap between the flue gas manifold and the single battery, and greatly improve the sealing reliability.

[0017] Furthermore, the aforementioned battery module assembly also includes n elastic limiting rings; the n elastic limiting rings correspond one-to-one with the n first through holes and the n explosion venting parts, the upper end face of each elastic limiting ring is tightly fitted with the bottom surface around the first through hole of the flue gas manifold, and the lower end face is tightly fitted with the surface of the upper cover plate around the explosion venting part of the single battery; the sealing adhesive layer is located around the elastic limiting rings.

[0018] When there are differences in the distance between the flue gas manifold and each individual battery cell, the elastic limiting ring can adaptively compensate for the gap through its own elastic deformation, always maintaining a tight fit between the upper end face and the bottom surface of the flue gas manifold, and between the lower end face and the battery cover plate. Combined with the sealing adhesive layer for secondary sealing around the channel, the sealing performance is further improved.

[0019] Furthermore, the aforementioned flue gas manifold is a metal pipe; the aforementioned sealant layer is a sealant layer. The sealant layer can form reliable electrical isolation between the flue gas manifold and the individual battery cells, completely avoiding the risk of short circuits.

[0020] Furthermore, the aforementioned battery module assembly also includes an insulating pad; the insulating pad has n second through holes spaced apart along a first direction;

[0021] The aforementioned insulating pad is placed between the flue gas manifold and each individual battery cell, and the n second through holes are connected to the n first through holes and the explosion venting parts on the n individual batteries cell one by one.

[0022] Each elastic limiting ring is fitted inside the corresponding second through hole, forming an annular injection space between the ring and the second through hole;

[0023] The aforementioned sealant layer includes a first sub-sealant layer, a second sub-sealant layer, and a third sub-sealant layer; the first sub-sealant layer is disposed between the upper surface of the insulating pad and the flue gas manifold, thereby achieving a sealed connection between each first through hole and the corresponding second through hole; the second sub-sealant layer is disposed between the lower surface of the insulating pad and each individual battery cell, thereby achieving a sealed connection between each second through hole and the corresponding explosion vent; the third sub-sealant layer is located within the annular injection space and is connected to the first and second sub-sealant layers.

[0024] The insulating pad, together with the sealing adhesive layer and the elastic limiting ring, forms a triple insulation barrier, further improving the electrical safety performance of the battery module components.

[0025] Furthermore, each of the second through holes on the aforementioned insulating pad is a stepped hole, with the lower outer ring surface of the elastic limiting ring tightly attached to the wall of the small hole section of the second through hole, and an annular injection space formed between the upper outer ring surface and the wall of the large hole section of the second through hole.

[0026] Furthermore, an annular protrusion is provided around the explosion vent of the aforementioned single battery cell, and the annular protrusion is inserted into the corresponding first through hole, with the sealant layer located around the annular protrusion.

[0027] Furthermore, the aforementioned battery module also includes a rolled strip, two clamping plates, and two pressure plates;

[0028] The two clamping plates mentioned above are respectively set on the outside of the first and last individual cells; the strip mentioned above binds the two clamping plates and n individual cells together as one unit;

[0029] In the first direction, the battery modules extend from both ends of the aforementioned flue gas manifold above the clamping plate;

[0030] The two pressure plates mentioned above are respectively installed at both ends of the flue gas manifold and extend in the third direction, with the two ends of the pressure plates extending out of the flue gas manifold.

[0031] Mounting through holes are provided at both ends of the flue gas manifold extending from the pressure plate. Screws pass through the mounting through holes and connect to the clamping plate, so that the flue gas manifold is fixed to the battery module.

[0032] The strip and clamping plate work together to securely bundle n individual batteries into one unit, improving the structural compactness and vibration and shock resistance of the battery module in the first direction and preventing cell displacement. The flue gas manifold extends to the top of the clamping plate at both ends and is connected to the clamping plate by pressure plates and screws, which can further fix the flue gas manifold and apply stable pre-pressure to ensure the sealing effect of the sealant layer. In addition, the detachable structure with screw connection is easy to assemble and does not require modification of the battery module body, making it suitable for mass production.

[0033] The second aspect of this utility model provides a battery pack, including a support platform, a flue gas emission pipeline, and a plurality of the above-mentioned battery modules;

[0034] Multiple battery modules are installed side by side on the support platform;

[0035] The exhaust port of the flue gas manifold in each battery module is connected to the flue gas emission pipeline.

[0036] The battery pack of this invention connects the flue gas manifolds of multiple battery module components to the flue gas emission pipe, and orderly discharges the thermal runaway flue gas outside the battery pack, avoiding the problem of thermal runaway flue gas spreading inside the battery pack and affecting other module components, thereby improving the safety of the battery pack.

[0037] The beneficial effects of this utility model are:

[0038] This invention effectively prevents thermal runaway gas from leaking through the gap between the gas manifold and the individual battery cells based on the sealing adhesive layer. The gas manifold allows for the orderly discharge of thermal runaway gas, preventing it from spreading within the battery module and improving the safety of the battery module after thermal runaway.

[0039] Compared to welding, using a sealing layer to achieve a sealed connection not only makes the installation of the flue gas manifold simpler and the manufacturing cost lower, but also avoids potential damage to the internal structure of the individual battery cells caused by the high temperature of welding; at the same time, it can directly improve the thermal runaway safety of the original battery module without modifying other structures. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the battery module assembly in Example 1;

[0041] Figure 2 This is an exploded view of the battery module assembly in Example 1;

[0042] Figure 3This is a schematic diagram of the flue gas manifold in Example 1;

[0043] Figure 4 This is a cross-sectional view of the battery module assembly in Example 1;

[0044] Figure 5 This is an exploded view of the battery module assembly in Example 2;

[0045] Figure 6 This is a cross-sectional view of the battery module assembly in Example 2;

[0046] Figure 7 This is a schematic diagram of the battery module assembly in Example 3;

[0047] Figure 8 This is an exploded view of a battery module assembly in Example 3;

[0048] Figure 9 This is a cross-sectional view of a battery module assembly in Embodiment 3;

[0049] Figure 10 This is an exploded view of another battery module component in Example 3;

[0050] Figure 11 This is a cross-sectional view of another battery module component in Example 3;

[0051] Figure 12 This is a cross-sectional view of the battery module assembly in Example 4;

[0052] Figure 13 This is a cross-sectional view of the battery module assembly in Example 5;

[0053] Figure 14 This is a schematic diagram of the battery module assembly in Example 6;

[0054] Figure 15 This is a schematic diagram of the battery pack structure in Example 7.

[0055] The attached figures are labeled as follows:

[0056] 1. Battery module; 11. Single cell; 111. Explosion vent; 112. Annular protrusion; 2. Smoke manifold; 21. First through hole; 22. Smoke outlet; 3. Sealing layer; 31. Annular sub-sealing layer; 32. First sub-sealing layer; 33. Second sub-sealing layer; 34. Third sub-sealing layer; 4. Insulating pad; 41. Second through hole; 5. Elastic limiting ring; 6. Rolled strip; 7. Clamping plate; 8. Pressure plate; 9. Support platform. Detailed Implementation

[0057] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0058] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0059] In the description of this utility model, it should be noted that the terms "top," "bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] The design concept of this utility model is:

[0061] This utility model proposes a battery module assembly, including a battery module and a flue gas manifold; the battery module includes n individual batteries; where n is an integer greater than 1;

[0062] The flue gas manifold is fixed to the battery module and covers the explosion vent of each individual battery cell. The wall of the flue gas manifold has n first through holes. Each first through hole corresponds to an explosion vent on an individual battery cell, and the two are connected. A sealing layer is provided between the battery module and the flue gas manifold to achieve a sealed connection between each first through hole and its corresponding explosion vent. This flue gas manifold allows for the orderly discharge of thermal runaway flue gas, preventing its spread within the battery module and improving the safety of the battery module after thermal runaway.

[0063] In the battery industry, welding is typically used to ensure sealing reliability in areas requiring sealed connections. However, this invention breaks with the industry's perception that reliable sealing can only be achieved through welding, requiring no modifications to the existing battery module structure. It achieves sealed connection between the first through-hole of the flue gas manifold and all explosion-proof sections solely through a sealing adhesive layer. Compared to welding, this solution simplifies flue gas manifold installation, reduces manufacturing costs, and avoids the potential damage to the internal structure of individual cells caused by high welding temperatures. It improves the safety of the battery module in the event of thermal runaway without altering any other structure of the original battery module.

[0064] Furthermore, this invention can also effectively fix the flue gas manifold to the battery module through a sealing adhesive layer.

[0065] It should be noted that:

[0066] 1. The sealant in this utility model needs to have certain high temperature resistance to ensure the effectiveness of the sealing part under thermal runaway temperature; the flue gas manifold can be an electrically insulating pipe section or a conductive pipe section, such as a metal pipe. When a metal pipe is used, the sealant layer used should be an electrically insulating sealant layer.

[0067] 2. The single cell adopts a square aluminum-cased lithium battery, including a shell consisting of a top cover, a cylindrical body, and a bottom cover; and an electrode assembly located inside the shell; the electrode assembly here consists of a positive electrode, a separator, and a negative electrode arranged in sequence, assembled using a stacking or winding process. This commercially available square aluminum-cased lithium battery has completed processes such as electrolyte filling and formation.

[0068] Example 1

[0069] like Figure 1 and Figure 2 The diagram shown is a structural schematic and an exploded view of the battery module assembly in this embodiment, which mainly consists of battery module 1 and flue gas manifold 2.

[0070] The battery module 1 is mainly composed of 13 individual batteries 11, which are arranged along the thickness direction of the individual batteries 11. In some other embodiments, the number of individual batteries 11 can be adjusted according to actual needs.

[0071] For ease of description, such as Figure 1 As shown, the arrangement direction of the individual battery cells 11 can be defined as the first direction, the height direction of the individual battery cells can be defined as the second direction, and the length direction of the individual battery cells can be defined as the third direction.

[0072] The flue gas manifold 2 extends along a first direction, is fixed to the battery module 1, and covers the explosion vent 111 of each individual battery cell 11. In this embodiment, the explosion vent 111 of each individual battery cell 11 is located on the upper cover of the individual battery cell 11, so the flue gas manifold 2 is located on top of the battery module 1. In other embodiments, the position of the flue gas manifold 2 can be adjusted according to the position of the explosion vent 111 of the individual battery cell 11 to ensure that the flue gas manifold 2 covers the explosion vent 111 of each individual battery cell 11.

[0073] Combination Figure 3 As can be seen, in this embodiment, a rectangular tube is selected as the flue gas manifold 2, and a smoke outlet 22 is provided on the pipe wall of the flue gas manifold 2. The smoke outlet 22 can be located at any part of the flue gas manifold 2, as long as it is convenient for smoke exhaust or connection to external pipe sections. Thirteen first through holes 21 are opened on the pipe wall corresponding to the bottom surface of the flue gas manifold 2, each corresponding to the explosion relief part 111 of each individual battery 11. In order to ensure that the thermal runaway flue gas discharged from the explosion relief part 111 can be completely introduced into the first through holes 21 and to prevent the flue gas from escaping into the battery module 1 from the gap between the explosion relief part 111 and the first through hole 21, the projection of each first through hole 21 on the cover plate of the individual battery 11 covers the corresponding explosion relief part 111. The shape of the first through hole 21 can be adapted to the shape of the explosion relief part 111, which can further improve the sealing reliability between the first through hole 21 and the explosion relief part 111, and ensure that the flue gas is discharged in an orderly manner only through the flue gas manifold 2.

[0074] The flue gas manifold 2 is made of metal materials, such as steel or aluminum. For ease of processing, the flue gas manifold 2 can be integrally formed by extrusion, and the two ends can be sealed by welding. The flue gas manifold 2 can also be made of high-temperature resistant hard plastics, such as PEEK and PPS.

[0075] Combination Figure 4 In this embodiment, a sealing layer 3 is provided between the top of the battery module 1 and the bottom surface of the flue gas manifold 2 to achieve sealed communication between each first through hole 21 and the corresponding explosion vent 111. If the flue gas manifold 2 is made of metal, the sealing layer 3 is an insulating sealing layer, which simultaneously achieves sealed communication between the first through hole 21 and the explosion vent 111, fixation of the flue gas manifold 2 on the battery module 1, and electrical insulation between the flue gas manifold 2 and each individual battery cell 11.

[0076] It is understood that in this invention, the sealant layer 3, located between the battery module 1 and the flue gas manifold 2, must avoid the areas of the first through hole 21 and the explosion vent 111, ensuring that the flue gas flows only through the explosion vent 111 and the first through hole 21. Specifically, the sealant layer 3 can adopt two structural forms:

[0077] One-piece structure: The overall size of the sealant layer 3 is perfectly matched with the contact surface of the flue gas manifold 2 and the battery module 1, and can be directly covered and attached to the contact surface; it can be directly coated on the bottom surface of the flue gas manifold 2, avoiding the first through hole 21, or it can be coated on the cover plate of each individual battery 11, avoiding the explosion relief part 111.

[0078] Split structure: An independent annular sub-sealing adhesive layer 31 is designed and applied separately to the periphery of the explosion vent 111 of each individual battery 11 and / or the periphery of the first through hole 21 of the flue gas manifold 2. The inner contour dimension of the annular sub-sealing adhesive layer 31 is not less than the opening size of the explosion vent 111 and the first through hole 21, and the outer contour dimension is larger than the opening size of the explosion vent 111 and the first through hole 21 (the shape of the annular sub-sealing adhesive layer 31 is preferably adapted to the shape of the explosion vent 111 and / or the first through hole 21).

[0079] The one-piece structure forms a continuous sealing layer through surface contact, which can evenly distribute the weight of the flue gas manifold 2 and the impact force of flue gas, resulting in strong structural stability; assembly can be completed with a single application of adhesive, which is highly efficient. It is suitable for battery modules 1 with uniform spacing between the flue gas manifold 2 and each individual battery cell 11.

[0080] Split-type structure: The thickness of the corresponding annular sub-sealing adhesive layer 31 can be individually adjusted according to the distance between the flue gas manifold 2 and the individual battery cells 11, adapting to battery modules 1 where the distance between the flue gas manifold 2 and each individual battery cell 11 varies due to uneven bottom flatness or height deviation of the individual battery cells 11. Simultaneously, the annular sub-sealing adhesive layer 31 only seals around the first through hole 21 and the corresponding explosion vent 111, reducing adhesive usage, lowering costs, and reducing the weight of the battery module 1.

[0081] The sealant can be a high-temperature resistant sealant (such as commercially available fire-retardant sealant, high-temperature fire-resistant sealant, etc.), which must meet the following core performance requirements: First, high-temperature resistance, ensuring that the sealant layer does not melt or crack when the sealed part generates high-temperature smoke due to thermal runaway of the single battery 11, thus maintaining the effectiveness of the seal; second, adhesion performance, ensuring the stability of the connection between the smoke manifold 2 and the battery module 1, and preventing the sealant layer from falling off under vibration conditions. If the smoke manifold 2 is made of metal, the sealant should also have insulating properties to avoid electrical safety risks to the battery module 1 caused by the conductivity of the smoke manifold 2 and the casing of the single battery 11.

[0082] During assembly, the following procedure can be followed:

[0083] Pretreatment: Clean the area around the first through hole 21 of the flue gas manifold 2 and the surface of the corresponding explosion relief part 111 of each individual battery 11 casing to remove oil and dust and ensure that the adhesive layer is firmly bonded;

[0084] Apply adhesive: Apply adhesive to the bottom surface of the flue gas manifold 2 to prevent the adhesive from flowing into the first through hole 21 and affecting the flue gas flow; or apply adhesive around the explosion relief part 111 of each individual battery 11.

[0085] Press-fit fixing: Align the gas manifold 2 after applying the adhesive with the battery module 1, ensuring that each first through hole 21 is aligned with the corresponding explosion vent 111, and apply uniform pressure to initially shape the adhesive layer; or align the gas manifold 2 with the battery module 1, ensuring that each first through hole 21 is aligned with the corresponding explosion vent 111 of the surrounding sealant layer 31, and apply uniform pressure to initially shape the adhesive layer.

[0086] It should be noted that when the sealant layer 3 adopts a split structure, if the distance between adjacent first through holes is close and the thickness of the sealant layer is thick, during the pressure application process, each annular sealant layer 31 may disperse to the surrounding area and connect into one piece, transforming into an integrated structure.

[0087] Curing: After standing at room temperature until the adhesive layer is fully cured, a stable connection can be achieved. The operation is simple and suitable for mass production.

[0088] Example 2

[0089] Based on Example 1, this embodiment adds n elastic limiting rings 5 ​​(n=13 in this embodiment, suitable for 13 single cells 11) to enhance sealing and insulation performance and further improve the safety performance of battery module 1.

[0090] like Figure 5 and Figure 6 As shown, an elastic limiting ring 5 is provided between the flue gas manifold 2 and each individual battery cell 11.

[0091] from Figure 5 As can be seen, the 13 elastic limiting rings 5 ​​are arranged at intervals along the first direction (the arrangement direction of the individual battery cells 11), corresponding one-to-one with the 13 first through holes 21 of the flue gas manifold 2 and the explosion venting parts 111 of the 13 individual battery cells 11. The elastic limiting rings 5 ​​adopt a ring structure, and the inner contour is not smaller than the opening size of the corresponding first through hole 21 and the explosion venting part 111.

[0092] Combination Figure 6 The upper end face of each elastic limiting ring 5 is tightly fitted with the bottom surface around the first through hole 21 of the flue gas manifold 2, and the lower end face is tightly fitted with the surface of the upper cover plate around the explosion relief part 111 of the single battery 11, which can realize the secondary sealing between the first through hole and the corresponding explosion relief part.

[0093] The elastic limiting ring 5 can be made of high-temperature resistant rubber material to ensure that the structure remains intact under the high-temperature environment caused by thermal runaway of the single cell 11.

[0094] This embodiment adds a "positioning and installation of the elastic limiting ring 5" step to the assembly process of the original embodiment 1. The specific process is as follows:

[0095] Pretreatment: Same as in Example 1, clean the area around the first through hole 21 of the flue gas manifold 2 and the surface of the upper cover plate of the single battery 11 (focus on cleaning the explosion relief part 111 and the surrounding area), and at the same time remove dust and oil stains from the elastic limiting ring 5.

[0096] Pre-installed elastic limiting rings 5: 13 elastic limiting rings 5 ​​are fixed to the upper cover area around the explosion vent of the corresponding single battery cell, which can be fixed by adhesive.

[0097] Glue application: Apply glue around the elastic limiting ring 5 of the upper cover plate;

[0098] Press-fit fixing: Align the flue gas manifold 2 with the battery module 1, ensuring that each first through hole is aligned with the elastic limiting ring 5; then apply uniform pressure from the top of the flue gas manifold 2 to initially shape the adhesive layer; at the same time, the lower end face of the elastic limiting ring 5 is tightly fitted with the upper cover plate, and the upper end face of the elastic limiting ring 5 is tightly fitted with the bottom surface of the flue gas manifold.

[0099] Curing: Same as in Example 1, just wait for the adhesive layer to cure.

[0100] The elastic limiting ring 5 in this embodiment has at least the following three functions:

[0101] 1. Sealing and strengthening effect

[0102] When there is a difference in the distance between the flue gas manifold 2 and each individual battery 11, the elastic limiting ring 5 can adaptively compensate for the gap through its own elastic deformation, always keeping the upper end face tightly fitted with the bottom surface of the flue gas manifold 2 and the lower end face tightly fitted with the battery cover plate. Combined with the sealing adhesive layer 3 for secondary sealing around the channel, the sealing performance is further improved.

[0103] 2. Adhesive layer limiting function

[0104] The elastic limiting ring 5 prevents the adhesive from flowing into the flue gas manifold 2 through the first through hole 21, ensuring that the flue gas manifold 2 is unobstructed.

[0105] 3. Insulation synergy

[0106] When a metal flue gas manifold is used, the elastic limiting ring 5 itself has high insulation performance, forming double insulation with the adhesive layer, further reducing the risk of electrical short circuit.

[0107] Example 3

[0108] Unlike the above embodiments, this embodiment uses a metal flue gas manifold 2. Based on the above embodiments, an insulating pad 4 is added. The insulating properties of the insulating pad 4 are used to further reduce the risk of electrical conduction between the flue gas manifold 2 and the single battery 11.

[0109] like Figure 7 and Figure 8 As shown, taking the addition of an insulating pad 4 based on Embodiment 1 as an example, the insulating pad 4 is disposed between the flue gas manifold 2 and the battery module 1.

[0110] The structure of insulating pad 4 is as follows Figure 8 As shown, a long strip-shaped insulating pad 4 is used, with an overall length slightly longer than the bottom length of the flue gas manifold 2 and a width not less than the bottom width of the flue gas manifold 2.

[0111] The insulating pad 4 has 13 second through holes 41 arranged at intervals along the first direction (i.e. the arrangement direction of the individual cells 11). The number and arrangement spacing of the second through holes 41 correspond one-to-one with the first through hole 21 of the flue gas manifold 2 and the explosion venting part 111 of the individual cells 11. The inner contour size of the second through hole 41 is slightly larger than the opening size of the corresponding first through hole 21 and explosion venting part 111.

[0112] The insulating pad 4 can be made of high-temperature resistant rubber or epoxy insulating material to ensure the structural integrity of the single cell 11 under high temperature environment caused by thermal runaway, and to prevent the second through hole 41 from shifting due to deformation of the insulating pad 4, thereby further ensuring the stability of the sealing and insulation functions.

[0113] like Figure 9 As shown, this embodiment provides two layers of insulating sealant 3. One layer is located between the upper surface of the insulating pad 4 and the flue gas manifold 2, achieving sealed communication between each first through hole 21 and the corresponding second through hole 41. The other layer is located between the lower surface of the insulating pad 4 and each individual battery 11, achieving sealed communication between each second through hole 41 and the corresponding explosion venting part 111. For ease of description, the upper insulating sealant layer 3 is defined as the first sub-sealant layer 32, and the lower insulating sealant layer 3 is defined as the second sub-sealant layer 33.

[0114] Similar to Example 1, the first sub-sealant layer 32 and the second sub-sealant layer 33 can also adopt two structures:

[0115] One-piece structure: The overall size of the first sub-sealing adhesive layer 32 is perfectly matched with the contact surface of the flue gas manifold 2 and the insulating pad 4. It can be directly covered and adhered to the contact surface. It can be directly coated on the upper surface of the insulating pad 4, avoiding the second through hole 41, or directly coated on the bottom surface of the flue gas manifold 2, avoiding the first through hole 21.

[0116] The second sub-sealing adhesive layer 33 has an overall size that perfectly matches the contact surface of the insulating pad 4 and the battery module 1. It can be directly covered and adhered to the contact surface. It can be directly coated on the lower surface of the insulating pad 4, bypassing the second through hole 41, or directly coated on the cover plate of each individual battery 11, bypassing the explosion vent 111.

[0117] Split structure: The first sub-sealing layer 32 includes n independent annular first sub-sealing layers, which are individually coated in the area surrounding the second through hole 41 on the upper surface of each first through hole 21 and / or insulating pad 4. The inner contour dimension of the annular first sub-sealing layer is not less than the opening size of the first through hole 21 and the second through hole 41, and the outer contour dimension is greater than the opening size of the first through hole 21 and the second through hole 41 (the shape of the annular first sub-sealing layer is preferably adapted to the shape of the second through hole 41 and / or the first through hole 21).

[0118] The second sub-sealing layer 33 includes n independent annular second sub-sealing layers, which are individually coated in the periphery of the explosion vent 111 and / or the periphery of the second through hole 41 on the lower surface of the insulating pad 4 of each individual battery cell 11. The inner contour dimension of the annular second sub-sealing layer is not less than the opening size of the explosion vent 111 and the second through hole 41, and the outer contour dimension is greater than the opening size of the explosion vent 111 and the second through hole 41 (the shape of the annular second sub-sealing layer is preferably adapted to the shape of the explosion vent 111 and / or the second through hole 41).

[0119] The one-piece structure forms a continuous sealing layer through surface contact, which can evenly distribute the weight of the flue gas manifold 2 and the impact force of the flue gas, resulting in strong structural stability; assembly can be completed with a single application of adhesive, which is highly efficient. It is suitable for battery modules 1 with standard spacing between each individual battery cell 11 and uniform spacing between the flue gas manifold 2 and each individual battery cell 11.

[0120] Split-type structure: The thickness of the corresponding annular adhesive layer can be adjusted individually according to the distance between the flue gas manifold 2 and the individual battery cells 11, adapting to battery modules 1 where the distance between the flue gas manifold 2 and each individual battery cell 11 varies due to uneven bottom flatness or height deviation of the individual battery cells 11. Simultaneously, the annular sub-sealing adhesive layer 31 only seals the key areas around the first through hole 21 and the corresponding explosion vent 111, reducing adhesive usage, lowering costs, and reducing the weight of the battery module 1.

[0121] The first sub-sealant layer 32 and the second sub-sealant layer 33 can have the same or different structures. For example, if the first sub-sealant layer 32 adopts an integral structure, the second sub-sealant layer 33 can adopt an integral structure or a split structure. In order to ensure uniform stress distribution, this embodiment preferably adopts the same structure for both. That is, if the first sub-sealant layer 32 adopts an integral structure, the second sub-sealant layer 33 will adopt an integral structure accordingly. If the first sub-sealant layer 32 adopts a split structure, the second sub-sealant layer 33 will adopt a split structure accordingly.

[0122] The specific assembly in this embodiment is as follows:

[0123] Pretreatment: Clean the area around the first through hole 21 of the flue gas manifold 2 and the surface of the upper cover plate of the single battery 11 (focus on cleaning the explosion relief part 111 and the surrounding area), and at the same time clean the upper and lower surfaces of the insulating pad 4 (remove dust and oil stains).

[0124] Apply adhesive: Apply adhesive around the explosion vent 111 of each individual battery cell 11 (corresponding to the second sub-sealing layer 33);

[0125] Press-fit fixing: Fix the insulating pad 4 to the battery module 1, ensuring that the second through hole 41 of each insulating pad 4 is aligned with the explosion vent 111 of the corresponding single battery cell 11; then, apply adhesive to the upper surface of the insulating pad 4 and press the flue gas manifold 2 onto the insulating pad 4.

[0126] Curing: As in Example 1, after the adhesive layer is fully cured, the insulating pad 4, the adhesive layer, the flue gas manifold 2, and the single battery 11 form an integrated structure, achieving a stable connection without the need for additional fasteners.

[0127] In the specific assembly process, adhesive can be applied to the upper surface of the insulating pad 4 or the bottom surface of the flue gas manifold first, and the insulating pad can be fixed to the bottom surface of the flue gas manifold 2 to ensure that the projection of the second through hole 41 of the insulating pad 4 on the bottom surface of the flue gas manifold 2 completely covers the corresponding first through hole 21; then adhesive is applied to the lower surface of the insulating pad 4, and the flue gas manifold with the insulating pad is aligned with the battery module 1 to ensure that the second through hole 41 of each insulating pad 4 is aligned with the explosion venting part 111 of the corresponding single battery 11; then uniform pressure is applied from the top of the flue gas manifold 2 to make the lower surface of the adhesive layer fully contact the upper cover plate of the single battery 11 and then cure it.

[0128] like Figure 10 and Figure 11 As shown, taking the addition of an insulating pad as an example based on Example 2.

[0129] from Figure 10 As can be seen, the 13 second through holes 41 on the insulating pad 4 correspond one-to-one with the 13 elastic limiting rings 5, and the opening size of each second through hole 41 is slightly larger than the outer contour size of the corresponding elastic limiting ring 5.

[0130] Combination Figure 11 Each elastic limiting ring 5 is fitted inside the corresponding second through hole 41, forming an injection space between the elastic limiting ring 5 and the second through hole, which can constrain the radial flow of the adhesive and prevent the adhesive from entering the flue gas manifold 2 through the first through hole 21.

[0131] The assembly process is as follows:

[0132] Pretreatment: Clean the area around the first through hole 21 of the flue gas manifold 2 and the surface of the upper cover plate of the single battery 11 (focus on cleaning the explosion relief part 111 and the surrounding area), and at the same time clean the insulating pad 4 and the elastic limiting ring 5 (remove dust and oil stains).

[0133] Positioning of insulating pad 4: Apply adhesive to the lower surface of insulating pad 4 (forming a partial second sub-sealing layer 33) and fix it to the top of the battery module;

[0134] Pre-installation of elastic limiting ring 5: 13 elastic limiting rings 5 ​​are respectively embedded into 13 second through holes 41 of insulating pad 4 to ensure that an annular injection space is formed between the outer contour of elastic limiting ring 5 and the inner wall of the second through hole 41, and the lower end face of elastic limiting ring 5 is in contact with the upper cover plate area around the explosion relief part of the single battery.

[0135] It should be noted that the order of the insulating pad and the elastic limiting ring can be adjusted during the actual assembly process;

[0136] Adhesive application: Apply adhesive to the annular injection space between the elastic limiting ring 5 and the inner wall of the second through hole 41;

[0137] Press-fit fixing: Align the flue gas manifold 2 with the battery module 1, ensuring that each first through hole is aligned with the elastic limiting ring 5; then apply uniform pressure from the top of the flue gas manifold 2. Under the pressure, the adhesive overflows from the annular injection space between the insulating plate and the flue gas manifold, forming the first sub-sealing adhesive layer 32; the adhesive overflows from the annular injection space between the insulating plate and the battery module, forming the second sub-sealing adhesive layer 33; the adhesive layer located in the annular injection space serves as the third sub-sealing adhesive layer 34, forming an integral adhesive layer with the first sub-sealing adhesive layer 32 and the second sub-sealing adhesive layer 33; at the same time, the lower end face of the elastic limiting ring 5 is tightly fitted with the upper cover plate, and the upper end face of the elastic limiting ring 5 is tightly fitted with the bottom surface of the flue gas manifold.

[0138] Curing: Same as the above embodiments, wait for the adhesive layer to cure.

[0139] Example 4

[0140] Unlike Embodiment 3, this embodiment further improves sealing reliability by optimizing the structure of each second through hole on the insulating pad.

[0141] like Figure 12 As shown, in Figure 11Taking the optimized second through hole as an example, in this embodiment, the second through hole 41 on the insulating pad 4 adopts a stepped hole structure, consisting of a coaxial small hole segment and a large hole segment. The small hole segment is located on the side closer to the single cell 11, and the large hole segment is located on the side closer to the flue gas manifold 2. The elastic limiting ring 5 is sleeved in the corresponding second through hole 41. Its upper end face is tightly fitted with the bottom surface around the first through hole 21 of the flue gas manifold 2, and its lower end face is tightly fitted with the surface of the upper cover plate around the explosion venting part 111 of the single cell 11. The lower outer ring surface is tightly fitted with the hole wall of the small hole segment of the second through hole, and an annular injection space is formed between the upper outer ring surface and the hole wall of the large hole segment of the second through hole.

[0142] The assembly process is the same as in Example 3, and will not be repeated here.

[0143] Compared to the straight hole structure in Example 3, the annular injection space formed by the large hole section of the stepped hole and the elastic limiting ring can increase the effective amount of adhesive injection within the same assembly space, thereby increasing the thickness of the sealant layer, optimizing the sealing performance, and reducing the risk of high-temperature flue gas leakage from the interface.

[0144] Example 5

[0145] Based on the above embodiments, this embodiment optimizes the explosion venting section 111 area of ​​the individual battery 11 by adding an annular protrusion 112 around the explosion venting section 111. When assembling the flue gas manifold 2, at least a portion of the annular protrusion 112 in each individual battery 11 is inserted into the corresponding first through hole 21 to form a shaft-hole mating structure, preventing displacement between the flue gas manifold 2 and the battery module 1 and the problem of sealing failure between the first through hole 21 and the corresponding explosion venting section 111.

[0146] When the flue gas manifold 2 is a metal pipe, the corresponding annular protrusion 112 is preferably made of an insulating material.

[0147] like Figure 13 As shown, taking the addition of annular protrusions 112 based on Embodiment 4 as an example, in this embodiment, the annular protrusions 112 in each individual battery 11 are integrally formed or fixed to the surface of the upper cover plate around the explosion venting part 111 of the individual battery 11, and are distributed in a ring around the explosion venting part 111.

[0148] The inner contour dimension of the annular protrusion 112 is larger than the opening dimension of the explosion vent 111 of the single battery 11, ensuring that the explosion vent 111 is not blocked and the normal release of thermal runaway smoke is not affected; the outer contour dimension is slightly smaller than the opening dimension of the corresponding first through hole 21, so that at least part of the structure of the annular protrusion 112 can be inserted into the corresponding first through hole 21.

[0149] like Figure 13As shown, the annular protrusion 112 of each individual battery 11 is inserted into the corresponding first through hole 21. The elastic limiting ring 5 is elastically sleeved around the annular protrusion and embedded in the annular injection space between the annular protrusion 112 and the second through hole of the insulating pad 4. The upper end face is tightly attached to the bottom surface around the first through hole 21 of the flue gas manifold 2, and the lower end face is tightly attached to the surface of the upper cover plate around the explosion relief part 111 of the individual battery 11.

[0150] The assembly process is as follows:

[0151] Pretreatment: Clean the area around the first through hole 21 of the flue gas manifold 2 and the surface of the upper cover plate of the single battery 11 (focus on cleaning the explosion relief part 111, the surrounding area and the annular protrusion), and clean the insulating pad 4 and the elastic limiting ring 5 (remove dust and oil stains).

[0152] Pre-installation of elastic limiting ring 5: 13 elastic limiting rings 5 ​​are respectively fitted around the periphery of each annular protrusion, and the lower end face of the elastic limiting ring 5 is in contact with the upper cover area around the explosion vent of the single battery.

[0153] Positioning of insulating pad 4: Apply adhesive to the lower surface of insulating pad 4 (to form a partial second sub-sealant layer 33), fix it to the top of the battery module, and ensure that the elastic limiting ring 5 is embedded in the corresponding second through hole 41 and forms an injection space between it and the inner wall of the second through hole 41.

[0154] Adhesive application: Apply adhesive to the annular injection space between the elastic limiting ring 5 and the inner wall of the second through hole 41;

[0155] Press-fit fixing: Align the flue gas manifold 2 with the battery module 1, ensuring that each annular protrusion is inserted into the corresponding first through hole; then apply uniform pressure from the top of the flue gas manifold 2. Under the pressure, the adhesive overflows from the annular injection space to the space between the insulating plate and the flue gas manifold, forming the first sub-sealing layer 32; the adhesive overflows from the annular injection space to the space between the insulating plate and the battery module, forming the second sub-sealing layer 33; at the same time, the lower end face of the elastic limiting ring 5 is tightly attached to the upper cover plate, and the upper end face of the elastic limiting ring 5 is tightly attached to the bottom surface of the flue gas manifold.

[0156] Curing: Same as the above embodiments, wait for the adhesive layer to cure.

[0157] Example 6

[0158] Based on the above embodiment, this embodiment adds clamping plates 7 to the outer sides of the first and last individual cells 11 (i.e., the 13 individual cells 11 are numbered 1 to 13 sequentially, with the two clamping plates 7 respectively positioned on both sides of cell 1 and cell 13), and then secures them with a rolling strip 6. The rolling strip 6 and clamping plates 7 effectively suppress the expansion of individual cells 11, which could affect the cycle performance of the battery module 1. Simultaneously, it improves the structural compactness and vibration and shock resistance of the battery module 1 in the first direction, preventing displacement of individual cells 11.

[0159] In addition, in order to further improve the stability of the flue gas manifold 2, this embodiment uses screws and pressure plates 8 in conjunction with clamping plates 7 to achieve reliable fixation.

[0160] Specifically, such as Figure 14 As shown, in the first direction, the battery module 1 extends from both ends of the flue gas manifold 2 above the clamping plate 7.

[0161] The pressure plate 8 is made of the same material as the clamping plate 7, and its length is slightly longer than the width of the flue gas manifold 2. The two pressure plates 8 are respectively set at both ends of the flue gas manifold 2 and extend along the third direction. The two ends of the pressure plate 8 extend out of the flue gas manifold 2.

[0162] Mounting through holes are provided at both ends of the flue gas manifold 2 extending from each pressure plate 8. Screws pass through the mounting through holes and connect to the clamping plate 7, so that the flue gas manifold 2 is fixed to the battery module 1.

[0163] This fixing method, combined with the adhesive layer, further improves the stability of the flue gas manifold on the battery module. It also provides stable pre-pressure for the flue gas manifold 2, ensuring the sealing effect of the sealing adhesive layer 3. Furthermore, the use of detachable screw connections makes assembly simple and does not require modification of the battery module 1 itself, making it suitable for mass production needs.

[0164] Example 7

[0165] like Figure 15 As shown, this embodiment provides a battery pack composed of battery module components from the above embodiments. The battery pack includes a support platform 9, a flue gas emission pipe, and the aforementioned multiple battery module components. The structure of this battery pack is basically the same as the external structure of existing battery packs. Specifically:

[0166] Multiple battery module components are installed side by side on the support platform 9. The smoke outlet of the flue gas manifold 2 in each battery module component is connected to the flue gas emission pipeline. When thermal runaway occurs, the thermal runaway flue gas in the single cell 11 is discharged from the battery pack through the explosion relief part 111 of the single cell 11, the second through hole 41, the first through hole 21, the flue gas manifold 2, and the flue gas emission pipeline for subsequent processing.

[0167] In this embodiment, a liquid cooling plate can also be provided between the bottom of multiple battery module assemblies and the support platform 9; in order to ensure that the battery module 1 and the liquid cooling plate are kept insulated, an insulating layer needs to be provided between the bottom of multiple battery modules 1 and the liquid cooling plate.

Claims

1. A battery module assembly, characterized in that: This includes battery modules and flue gas manifolds; The battery module includes n individual batteries arranged along a first direction, where n is an integer greater than 1; The flue gas manifold is provided with a flue gas outlet, and the pipe wall of the flue gas manifold is provided with n first through holes arranged at intervals along the first direction. The flue gas manifold extends along the first direction and is fixed on the battery module. The n first through holes are connected one-to-one with the explosion venting parts on the n individual batteries. A sealing layer is provided between the flue gas manifold and each individual battery cell to achieve a sealed connection between each first through hole and the corresponding explosion relief part, ensuring that the thermal runaway flue gas of the individual battery cell can only be discharged from the flue gas manifold outlet.

2. The battery module assembly according to claim 1, characterized in that: The flue gas manifold is fixed to the battery module based on a sealant layer.

3. The battery module assembly according to claim 2, characterized in that: The size of the sealant layer is adapted to the contact surface between the flue gas manifold and each individual battery cell.

4. The battery module assembly according to claim 2, characterized in that: The sealant layer includes n annular sub-sealant layers, each annular sub-sealant layer corresponding to one of the n first through holes and n explosion venting sections; the area enclosed by each annular sub-sealant layer is projected onto the flue gas manifold and completely covers the corresponding first through hole; the area enclosed by each annular sealant layer is projected onto the individual battery and completely covers the corresponding explosion venting section.

5. The battery module assembly according to any one of claims 1 to 4, characterized in that: It also includes n elastic limiting rings; the n elastic limiting rings correspond one-to-one with the n first through holes and the n explosion venting parts, the upper end face of each elastic limiting ring is tightly fitted with the bottom surface around the first through hole of the flue gas manifold, and the lower end face is tightly fitted with the surface of the upper cover plate around the explosion venting part of the single battery; the sealing adhesive layer is located outside the elastic limiting rings.

6. The battery module assembly according to claim 5, characterized in that: The flue gas manifold is a metal pipe; the sealant layer is an insulating sealant layer.

7. The battery module assembly according to claim 6, characterized in that: It also includes an insulating pad; the insulating pad has n second through holes spaced apart along a first direction; The insulating pad is disposed between the flue gas manifold and each individual battery cell, and the n second through holes are connected to the n first through holes and the explosion venting parts on the n individual batteries cell one by one. Each elastic limiting ring is fitted inside the corresponding second through hole, forming an annular injection space between the ring and the second through hole; The sealant layer includes a first sub-sealant layer, a second sub-sealant layer, and a third sub-sealant layer; the first sub-sealant layer is disposed between the upper surface of the insulating pad and the flue gas manifold, achieving sealed communication between each first through hole and the corresponding second through hole; the second sub-sealant layer is disposed between the lower surface of the insulating pad and each individual battery cell, achieving sealed communication between each second through hole and the corresponding explosion vent; the third sub-sealant layer is located within the annular injection space and is connected to the first sub-sealant layer and the second sub-sealant layer.

8. The battery module assembly according to claim 7, characterized in that: Each of the second through holes on the insulating pad is a stepped hole. The outer ring surface of the lower part of the elastic limiting ring is in close contact with the hole wall of the small hole section of the second through hole, and an annular injection space is formed between the outer ring surface of the upper part and the hole wall of the large hole section of the second through hole.

9. The battery module assembly according to claim 1, characterized in that: The explosion vent of the individual battery is provided with an annular protrusion around its periphery. The annular protrusion is inserted into the corresponding first through hole, and the sealant layer is located around the annular protrusion.

10. The battery module assembly according to claim 1, characterized in that: The battery module also includes a strip, two clamping plates, and two pressure plates; The two clamping plates are respectively set on the outside of the first and last individual cells; the rolling strip binds the two clamping plates and n individual cells together as one; In the first direction, the battery modules extend from both ends of the flue gas manifold above the clamping plate; The two pressure plates are respectively set at both ends of the flue gas manifold and extend in the third direction, with the two ends of the pressure plates extending out of the flue gas manifold. Mounting through holes are provided at both ends of the flue gas manifold extending from the pressure plate. Screws pass through the mounting through holes and connect to the clamping plate, so that the flue gas manifold is fixed to the battery module.

11. A battery pack, characterized in that, Includes a support platform, flue gas emission pipeline, and multiple battery modules as described in any one of claims 1 to 10; Multiple battery modules are installed side by side on the support platform; The exhaust port of the flue gas manifold in each battery module is connected to the flue gas emission pipeline.

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