Explosion venting collecting pipe assembly for battery module and battery module

Abstract

The utility model belongs to the field of batteries, and particularly relates to an explosion venting collecting pipe assembly for a battery module and the battery module. The problem that an existing battery module has potential safety hazards is solved. The explosion venting collecting pipe assembly comprises a hollow pipe fitting and a connecting part; at least one first through hole penetrating through an inner cavity of the hollow pipe fitting is formed in the first pipe wall of the hollow pipe fitting, the hollow pipe fitting is communicated with each single battery explosion venting part through the first through hole, and the connecting part is arranged on the hollow pipe fitting and used for being connected with a battery module. The battery module comprises the explosion venting collecting pipe assembly. And when the single batteries are subjected to thermal runaway, thermal runaway flue gas breaks through the explosion venting part and is discharged from the hollow pipe fitting, so that the influence of thermal runaway flue gas dispersion on other single batteries is avoided, and the safety performance of the battery module is improved. And meanwhile, the explosion venting collecting pipe assembly and the battery module can be more conveniently fixed based on the connecting part.

Description

Technical Field

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

[0002] Currently, multiple individual cells are electrically connected to form a battery module (also known as a battery pack).

[0003] However, individual cells in a battery module may experience thermal runaway due to mechanical, electrical, or thermal abuse, as well as their own defects. If thermal runaway occurs and is not effectively handled, it can cause a safety accident and threaten the personal safety of people around the battery module. Summary of the Invention

[0004] This utility model provides a venting manifold assembly for battery modules and a battery module, which mainly solves the safety hazards of existing battery modules due to thermal runaway.

[0005] The first aspect of this utility model provides a venting manifold assembly for a battery module, wherein the battery module includes m individual batteries arranged in the same direction; where m is an integer greater than 1.

[0006] The explosion relief manifold assembly includes hollow pipe fittings and connecting parts;

[0007] At least one through hole is formed on the first tube wall of the hollow tube, penetrating its inner cavity. The inner cavity of the hollow tube serves as a confluence channel for thermal runaway flue gas and is connected to the explosion venting section of each individual battery cell through the first through hole.

[0008] The connecting part is located on the hollow tube and is used to connect to the battery module.

[0009] When the aforementioned explosion venting manifold assembly is fixed to the top of the battery module, if any single cell constituting the battery module experiences thermal runaway, the thermal runaway fumes will break through the explosion venting section and be discharged from the hollow tube, preventing the thermal runaway fumes from spreading and affecting the remaining single cells, thereby improving the safety performance of the battery module.

[0010] Meanwhile, this utility model provides a connecting part on the hollow tube, which is used to fix the explosion venting manifold assembly and the battery module. Compared with fixing the hollow tube directly to the battery module, the connecting part makes it easier to fix the two together, and the fixing process does not affect the structure of the hollow tube.

[0011] Furthermore, there are m first through holes, arranged along the length of the hollow tube, each corresponding to a venting section on one of the m individual batteries. The inner cavity of the hollow tube is connected to the corresponding venting section through the m first through holes. By creating first through holes corresponding to the venting sections, compared to creating a single elongated through hole, it is easier to ensure the sealing performance between the venting manifold assembly and the battery module after fixing the venting manifold assembly to the top of the battery module.

[0012] Furthermore, the orthographic projection of each first through hole onto the cover plate of the corresponding cell containing the explosion vent completely covers the explosion vent. During installation, the first through hole is not required to be concentric with the explosion vent, thus reducing the requirements for machining accuracy and minimizing the impact of machining and assembly accuracy on the product yield.

[0013] Furthermore, the above-mentioned connecting part can adopt various structural forms. In order to facilitate processing, the present invention preferably uses two connecting plates as the connecting part; the two connecting plates are respectively fixed on two opposite third pipe walls of the hollow pipe and extend along the length direction of the hollow pipe. This structure can be integrally formed by aluminum extrusion process.

[0014] Furthermore, each of the two connecting plates has n second through holes, arranged along the length of the connecting plate, where n is an integer greater than 1. These second through holes serve as bolt holes, allowing the explosion-venting manifold assembly to be fixed to the top of the battery module using bolt fastening.

[0015] Furthermore, the aforementioned explosion-venting manifold assembly also includes a flexible base plate, which is used to be disposed between the hollow tube and the connecting part and the top cover of the individual battery; the flexible base plate has a third through hole that corresponds to and penetrates the first through hole. When the dimensions of each individual battery differ in the height direction due to processing errors, if the lower cover of each individual battery is located on the same plane, it will inevitably cause the upper cover of each individual battery to not be able to remain on the same plane. This utility model can compensate for the height difference between the upper cover plates by deforming the flexible base plate and adjusting the thickness of the adhesive layer; in addition, placing the flexible base plate between the upper cover of the individual battery and the hollow tube can be used as a sealing gasket to further improve the sealing performance between the hollow tube and the upper cover plate.

[0016] Furthermore, the flexible base plate is also provided with a fourth through hole that corresponds to and penetrates the second through hole.

[0017] The second aspect of this utility model provides a battery module, including m individual batteries arranged in the same direction, and also including the above-mentioned explosion venting manifold assembly for the battery module.

[0018] The explosion venting manifold assembly is fixed to the top of the battery module via a connector.

[0019] Furthermore, the aforementioned battery module also includes a locking component and a separator; a fixing post is provided at the top of the separator; the fixing post corresponds to the second through hole on the connecting plate and the fourth through hole on the flexible base plate;

[0020] The separator is clamped and fixed between adjacent individual cells, and the fixing post protrudes through the corresponding fourth and second through holes. The locking device is locked at the part of the fixing post that protrudes through the fourth and second through holes.

[0021] Using the aforementioned separator as a fixing point for the explosion venting manifold assembly in the battery module, fixing the explosion venting manifold to the top of the battery module will not cause any damage to the structure of each individual battery cell.

[0022] In addition, the separator has a certain degree of elasticity. When a single cell swells and deforms, the separator is squeezed by the single cell and undergoes elastic deformation. After the separator undergoes elastic deformation, it can provide expansion space for the expansion of the single cell.

[0023] Meanwhile, the heat generated during the charging and discharging of each individual battery can be transferred to the outside through the separator, reducing the risk of thermal runaway.

[0024] Furthermore, two limiting plates are provided at the bottom of the separator; both limiting plates are perpendicular to the separator body and parallel to the lower cover of the individual battery. The two limiting plates extend to different sides of the separator body and limit the lower cover of two adjacent individual batteries.

[0025] Furthermore, a sealing layer is provided between the flexible base plate and the cover plate of each individual battery cell; a sealing layer is provided between the hollow tube and the connecting plate and the flexible base plate.

[0026] Furthermore, the battery module also includes a terminal heat exchange device; the terminal heat exchange device includes a heat transfer tube assembly and a terminal adapter corresponding to each terminal.

[0027] The pole adapter has a through groove, and the pole adapter is fixed on the corresponding pole.

[0028] The inner cavity of the heat transfer tube assembly serves as a flow channel for the heat exchange medium, and is fitted within the through slot, forming two heat exchange channels at the top of the battery module. These two channels facilitate heat exchange at the polarity terminals of each individual battery cell, thereby achieving heat exchange for both the individual cells and the entire battery module; further enhancing the safety performance of this type of battery module.

[0029] The beneficial effects of this utility model are:

[0030] 1. The battery module of this utility model is fixed with a venting manifold assembly. When any single cell of the battery module experiences thermal runaway, the thermal runaway fumes break through the venting part and are discharged from the hollow tube, preventing the thermal runaway fumes from spreading and affecting the other single cells, thus improving the safety performance of the battery module.

[0031] Meanwhile, this utility model provides a connecting part on the hollow tube, which is used to fix the explosion venting manifold assembly and the battery module. Compared with fixing the hollow tube directly to the battery module, the connecting part makes it easier to fix the two together, and the fixing process does not affect the structure of the hollow tube.

[0032] 2. This utility model adds a separator to the battery module and uses the separator as a fixing part of the explosion venting manifold assembly to the battery module. When the explosion venting manifold is fixed to the top of the battery module, it does not cause any damage to the structure of each individual battery cell. Attached Figure Description

[0033] Figure 1 This is a first-view structural schematic diagram of the explosion venting manifold assembly in Example 1;

[0034] Figure 2 This is a schematic diagram of the explosion venting manifold assembly from a second perspective in Example 1;

[0035] Figure 3 This is a first cross-sectional view of the explosion venting manifold assembly in Example 1;

[0036] Figure 4 This is a second cross-sectional view of the explosion venting manifold assembly in Example 1;

[0037] Figure 5 This is a schematic diagram of the explosion venting manifold assembly in other embodiments;

[0038] Figure 6 This is a schematic diagram of the explosion relief manifold assembly in Example 2;

[0039] Figure 7 This is a schematic diagram of the exploded structure of the explosion-proof manifold assembly in Example 2;

[0040] Figure 8 This is a first cross-sectional view of the explosion relief manifold assembly in Example 2;

[0041] Figure 9 This is a second cross-sectional view of the explosion relief manifold assembly in Example 2;

[0042] Figure 10 This is a schematic diagram of the battery module structure in Example 3;

[0043] Figure 11 This is an exploded view of the battery module in Example 3;

[0044] Figure 12 This is a schematic diagram of the partition structure in Example 3;

[0045] Figure 13This is a partial structural diagram of the battery module in Example 3;

[0046] Figure 14 This is a cross-sectional view of the battery module in Example 3;

[0047] Figure 15 This is a schematic diagram of the battery module from another perspective in Example 3;

[0048] Figure 16 This is a schematic diagram of the battery module structure in Example 4;

[0049] Figure 17 This is a schematic diagram of the exploded structure of the battery module in Example 4.

[0050] The attached figures are labeled as follows:

[0051] 1. Hollow tube; 11. First tube wall; 12. First through hole; 13. Third tube wall; 2. Connecting part; 21. Second through hole; 3. Flexible base plate; 31. Third through hole; 32. Fourth through hole; 4. Single cell; 41. Electrode post; 42. Explosion vent; 5. Separator; 51. Separator body; 52. Fixing post; 53. Limiting plate; 6. Nut; 7. Electrode post adapter; 8. Heat transfer tube assembly; 81. First sub-hollow component; 82. Second sub-hollow component; 83. Metal conductive and thermally conductive layer. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] 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," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0055] This utility model provides a venting manifold assembly as a thermal runaway gas collection component for a battery module. The battery module includes m individual cells arranged in the same direction, where m is an integer greater than 1. When any individual cell in the battery module experiences thermal runaway, the thermal runaway gas is discharged from the venting manifold assembly, preventing the thermal runaway gas from spreading and affecting the remaining individual cells, thereby improving the safety performance of the battery module.

[0056] The explosion venting manifold assembly of this utility model includes a hollow tube, on which a connection part for connecting with a battery module is provided.

[0057] Hollow tubular components can be understood as hollow tubular structures, which can be either split or integrated. To facilitate fixing the hollow tubular component to the top of the battery module, the wall of the hollow tubular component that contacts the top of the battery module is flat. Typically, for ease of manufacturing, rectangular tubes are directly used for hollow tubular components; the following explanation primarily uses rectangular tubes. For ease of description, in this invention, the wall of the hollow tubular component that contacts the top of the battery module is defined as the first wall, the wall parallel to it is defined as the second wall, and the remaining two walls are defined as the third wall.

[0058] At least one first through hole is made in the first tube wall of the hollow tube, penetrating its inner cavity. After the explosion venting manifold assembly is fixed to the top of the battery module, the inner cavity of the hollow tube serves as a thermal runaway flue gas confluence channel and is connected to the explosion venting part of each individual battery in the battery module through the first through hole.

[0059] When any single cell in the battery module experiences thermal runaway, the runaway fumes break through the explosion vent and are discharged through the hollow tube, preventing the runaway fumes from spreading and affecting the remaining cells, thus improving the safety performance of the battery module.

[0060] Meanwhile, this utility model provides a connecting part on the hollow tube, which is used to fix the explosion venting manifold assembly and the battery module. Compared with fixing the hollow tube directly to the battery module, fixing the two based on the connecting part can be more convenient, reducing installation costs. At the same time, the fixing process has no impact on the hollow tube and has a high yield.

[0061] It should be noted that:

[0062] 1. The single-cell explosion relief section can also be called the single-cell explosion-proof section, pressure relief port, explosion-proof port, etc., and is mainly used for the emission of thermal runaway flue gas from single-cell batteries.

[0063] 2. The aforementioned connecting part is disposed on the outer wall of the hollow tube fitting, and may include two connecting plates. The two connecting plates are respectively fixed to two third tube walls of the hollow tube fitting and extend along the length of the hollow tube fitting. The two connecting plates and the hollow tube fitting may be integral parts or separate parts;

[0064] The aforementioned connecting part can also be multiple sub-connecting plates fixed on the two third pipe walls of the hollow pipe fitting.

[0065] 3. The above-mentioned connecting parts can be fixed to the battery module by welding, screw connection, bonding, riveting, bolt connection, etc.

[0066] 4. The first through hole mentioned above can be a single elongated through hole or multiple through holes. The multiple through holes are arranged along the length of the first tube wall of the hollow tube and correspond one-to-one with each explosion relief part.

[0067] This utility model also provides a battery module having the above-mentioned explosion venting manifold assembly, wherein the explosion venting manifold assembly is fixed to the battery module based on the connecting part.

[0068] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0069] Example 1

[0070] like Figures 1 to 4 As shown, this embodiment is a venting manifold assembly for a battery module, including a hollow tube 1 and a connecting part 2.

[0071] The hollow tube 1 is a rectangular tube with 13 first through holes 12 on its first tube wall 11. The 13 first through holes 12 are arranged along the length of the hollow tube 1. Each first through hole 12 corresponds to a venting part on the cover plate of a single cell 4. The inner cavity of the hollow tube 1 is connected to the venting parts of the 13 single cells 4 through the 13 first through holes 12. In this embodiment, one end of the hollow tube 1 is closed and the other end is open, serving as a thermal runaway flue gas exhaust port. In other embodiments, both ends of the hollow tube 1 can be open, serving as thermal runaway flue gas exhaust ports.

[0072] To reduce the precision requirements between each first through hole 12 and the corresponding explosion vent during installation, the orthographic projection of each first through hole 12 onto the cover plate of the cell 4 where the corresponding explosion vent is located completely covers the explosion vent. During installation, it is not required that the first through hole 12 be concentric with the explosion vent; it is only necessary to ensure that the first through hole 12 covers the explosion vent.

[0073] Meanwhile, before installing the explosion venting manifold assembly, positioning marks can be pre-set on the upper cover plate and the explosion venting manifold assembly according to the designed dimensions, so that each first through hole 12 can accurately cover the corresponding explosion venting part.

[0074] In some other embodiments, an elongated through hole can be opened on the first tube wall 11 of the hollow tube 1. The orthographic projection of the elongated through hole on the top of the battery module completely covers the explosion venting parts of all individual batteries 4. Compared with this embodiment, its processing and installation are simpler. However, the sealing performance between the elongated through hole and each explosion venting part is difficult to guarantee, and the problem of smoke leakage is easy to occur.

[0075] from Figures 1 to 4 As can be seen from the figure, this embodiment uses two connecting plates as connecting parts 2. The two connecting plates are respectively fixed on the two third pipe walls 13 of the hollow pipe 1 and extend along the length direction of the hollow pipe 1.

[0076] It should be noted that:

[0077] 1. In this embodiment, the length of the connecting plate is not limited. Its length can be equal to or less than the length of the hollow tube 1.

[0078] 2. In order to improve the sealing between the explosion relief manifold assembly and the cover plate of each individual battery 4 and prevent smoke from leaking between them, in this embodiment, the bottom surface of the two connecting plates is preferably located on the same plane as the first pipe wall 11 of the hollow pipe 1.

[0079] In this embodiment, the hollow tube 1 and the two connecting plates are integrated into one piece, which is integrally formed by aluminum extrusion process.

[0080] In some other embodiments, the hollow tube 1 and the two connecting plates can be separate parts, which are fixedly connected by welding.

[0081] In some other embodiments, the following can be used: Figure 5 The multiple connecting plates shown serve as the connecting part 2; all the multiple connecting plates are fixed on the third pipe wall 13 of the hollow pipe fitting 1 and are arranged along the length of the third pipe wall 13.

[0082] This embodiment uses bolt fixing to secure the explosion vent manifold assembly to the top of the battery module via a connecting plate. Figures 1 to 3 As can be seen from the figure, in this embodiment, five second through holes 21 are arranged along the length of each connecting plate as bolt holes. For the specific installation method, please refer to embodiment 3.

[0083] In some other embodiments, the number and position of the second through holes 21 can be adjusted according to actual needs.

[0084] In other embodiments, the second through hole 21 may not be provided on the connecting plate, and the connecting plate may be fixed to the top of the battery module by welding, screw connection or bonding.

[0085] Example 2

[0086] This embodiment is also a battery module explosion-venting manifold assembly. Unlike embodiment 1, this embodiment, based on embodiment 1, also includes a flexible base plate 3, the structure of which is as follows: Figures 6 to 9 As shown.

[0087] The flexible base plate 3 is positioned between the hollow tube 1 and the connecting plate and the top of the battery module (the top of the battery module can be understood as the cover plate of each individual battery cell 4).

[0088] A third through hole 31 is provided on the flexible base plate 3, corresponding one-to-one with the first through hole 12 on the hollow tube 1 and communicating with it, from... Figure 7 As can be seen from the diagram, in this embodiment, 13 third through holes 31 are opened on the flexible base plate 3, and each third through hole 31 is connected to a first through hole 12 on the hollow tube 1. At the same time, when the second through hole 21 is opened on the connecting plate, multiple fourth through holes 32 are also opened on the flexible floor, and each fourth through hole 32 is connected to a second through hole 21 on the two connecting plates.

[0089] The flexible base plate 3 is usually made of high-temperature resistant rubber or plastic materials, where high temperature usually refers to the battery thermal runaway temperature.

[0090] The flexible base plate 3 can be sealed and fixed to the cover plate of each individual battery cell 4 by adhesive bonding.

[0091] In this embodiment, when the dimensions of each individual battery cell 4 differ in the height direction due to processing errors, and if the lower covers of each individual battery cell 4 are located on the same plane, the upper covers of each individual battery cell 4 will inevitably not be able to remain on the same plane. This invention can compensate for the height difference between the upper covers by deforming the flexible base plate 3 and adjusting the thickness of the adhesive layer; therefore, this embodiment has lower requirements for the flatness of each upper cover, i.e., each explosion venting part. Furthermore, placing the flexible base plate 3 between the upper cover of the individual battery cell 4 and the hollow tube 1 can serve as a sealing gasket, improving the sealing performance between the hollow tube 1 and the upper cover.

[0092] Example 3

[0093] This embodiment is a battery module, the structure of which is as follows: Figure 10 and Figure 11 As shown, it includes 13 individual battery cells 4 arranged in the same direction. For ease of description, in this embodiment, the arrangement direction of the individual battery cells 4 is defined as the x-direction, the height direction of the individual battery cells 4 is defined as the z-direction, and the direction perpendicular to the x and z directions is defined as the y-direction.

[0094] In this embodiment, the single battery cell 4 is a prismatic battery. In other embodiments, the number and shape of the single battery cells 4 can be adjusted according to actual needs. Each single battery cell 4 has two terminals 41 with opposite polarities on its upper cover plate, and a venting section 42 located between the two terminals 41.

[0095] like Figure 10 and Figure 11 As shown, the battery module in this embodiment also includes the explosion venting manifold assembly from the above embodiment, which is fixed to the top of the battery module via the connecting part 2.

[0096] Figure 10 The explosion relief manifold assembly in Example 2 is used as an example.

[0097] like Figure 11 As shown, in this embodiment, a separator 5 can also be provided between any two adjacent single cells 4, wherein the number of separators 5 is the same as the number of second through holes 21 on each connecting plate.

[0098] The specific structure of partition 5 is as follows: Figure 12 As shown in the figure, the partition 5 in this embodiment includes a partition body 51, two fixing posts 52 (in this embodiment, the fixing posts 52 can be understood as bolts) disposed at the top of the partition body 51, and two limiting plates 53 disposed at the bottom of the partition body 51. In other embodiments, the number of fixing posts 52 and the number of limiting plates 53 can be adjusted according to actual needs; the two fixing posts 52 extend along the z-direction and are arranged along the y-direction, and the two fixing posts 52 correspond one-to-one with the two second through holes 21 on the two connecting plates located on the same straight line and the two fourth through holes 32 on the flexible base plate 3 corresponding to the two second through holes 21; the two limiting plates 53 are both perpendicular to the partition body 51 and parallel to the xy plane, and the two limiting plates 53 extend to different sides of the partition body 51.

[0099] Combination Figure 13 ( Figure 13 In the middle, to facilitate the display of separator 5, the outermost single cell is removed. Figure 14 and Figure 15 As can be seen, when the aforementioned separator 5 is fixed between two adjacent individual battery cells 4, the separator body 51 is in contact with the large surface of the adjacent individual battery cells 4, two limiting plates 53 are limited on the lower cover plates of the two individual battery cells 4, and two fixing posts 52 extend through the corresponding fourth through hole 32 and second through hole 21. A locking element is provided at the top of the fixing post 52. It should be noted that when the fixing post 52 is a bolt, the locking element mentioned here is a nut 6 that is compatible with it.

[0100] In this embodiment, the explosion venting manifold assembly can be connected to the battery module through the following process, which can be referred to... Figure 11 :

[0101] First, fix the separator 5 between adjacent individual cells 4, so that the two limiting plates 53 are limited to the lower cover plates of different individual cells 4.

[0102] Secondly, the flexible base plate 3 is bonded to the top cover of each individual battery cell 4 using sealant, so that the projection of each third through hole 31 completely covers the corresponding explosion vent, and the fixing post 52 on the separator 5 protrudes through the corresponding fourth through hole 32. To improve the bonding strength between the flexible base plate 3 and the top cover of the individual battery cell 4, the size of the flexible base plate 3 can be increased to increase the contact area between the flexible base plate 3 and the top cover. That is, the length of the flexible base plate 3 is greater than or equal to the length of the hollow tube 1, and the width is greater than the sum of the widths of the hollow tube 1 and the two connecting plates. In addition, the surface of the flexible base plate 3 can be treated to improve the bonding strength.

[0103] Next, the hollow tube 1 is fixed on the flexible base plate 3, so that the fixing post 52 on the partition 5 passes through the corresponding second through hole 21; sealant can be applied to the contact area between the first tube wall 11 of the hollow tube 1 and the flexible base plate 3 and the contact area between the connecting plate and the flexible base plate 3, so that the hollow tube 1 and the connecting plate are both bonded to the flexible base plate 3.

[0104] Finally, tighten the nut 6 onto the fixing post 52. The fixing post 52 generates axial tension, and under the limiting action of the limiting plate 53, the explosion relief pipe assembly is tightly attached to the top of the battery module.

[0105] In this embodiment, the partition 5 has at least the following advantages:

[0106] Firstly, as a fixing point for the battery module and the explosion venting manifold, fixing the explosion venting manifold to the top of the battery module does not cause any damage to the structure of each individual battery cell.

[0107] Secondly, the separator 5 has a certain degree of elasticity. When the single cell 4 swells and deforms, the separator 5 is squeezed by the single cell 4 and undergoes elastic deformation. After the separator 5 undergoes elastic deformation, it can provide expansion space for the expansion of the single cell 4.

[0108] Thirdly, the heat generated during the charging and discharging of each individual battery 4 can be transferred to the outside through the separator 5, reducing the risk of thermal runaway.

[0109] In this embodiment, an insulating layer can also be provided on the outer wall of the hollow tube 1 and the connecting plate to prevent short circuits caused by contact between the hollow tube 1, the connecting plate and the pole.

[0110] In some other embodiments, when the first through hole 12 is not opened on the connecting plate, the connecting plate and the fixing post 52 of the partition 5 can be welded together by welding, thereby fixing the explosion relief manifold assembly to the top of the battery module.

[0111] In some other embodiments, the battery module may not have a separator 5, and the connecting plate may be directly welded to the cover plate of each individual battery cell 4. However, compared to this embodiment, the welding process has a certain impact on the individual battery cell 4, which may damage the individual battery cell 4 and reduce the yield.

[0112] In some other embodiments, the limiting plate 53 may not be provided on the separator 5. The separator body 51 and the large surface of the single battery 4 can be fixed by adhesive bonding. The separator 5 can be limited in the z direction to achieve the function of the limiting plate 53.

[0113] Example 4

[0114] like Figure 16 and Figure 17 As shown, this embodiment adds a terminal heat exchange device to the battery module of embodiment 3 to further improve the safety performance of this type of battery module.

[0115] This embodiment of the electrode heat exchange device includes electrode adapters 7 fixed on each electrode and heat transfer tube assemblies 8 fixed on the electrode adapters 7. In this embodiment, blind holes can be opened on the electrode adapters 7 along the height direction, and the bottom of the blind holes can be welded to the electrode of the individual battery 4. Through slots are opened on each electrode adapter 7, and the heat transfer tube assembly 8 is clamped in the through slot. The inner cavity of the heat transfer tube assembly 8 serves as a heat exchange medium flow channel, and heat exchange is realized on the electrode adapters 7 of each individual battery 4 based on the heat exchange medium, thereby realizing heat exchange of each individual battery 4 and the battery module.

[0116] Preferably, the heat transfer tube assembly 8 in this embodiment can also be used as an electrical connector to realize the electrical connection of each individual battery cell 4. This embodiment takes series connection as an example.

[0117] from Figure 16 and Figure 17 As can be seen from the above, the heat transfer tube assembly 8 in this embodiment is a spliced ​​tube segment, which is spliced ​​together by multiple first sub-hollow components 81 and multiple second sub-hollow components 82. Since the heat transfer tube assembly 8 in this embodiment is an electrical connector, the part of its structure connected to the electrode adapter 7 must be a conductive component. At the same time, insulating components need to be set between the conductive components to prevent the single cell 4 from short-circuiting.

[0118] In this embodiment, the first hollow sub-component 81 is used as a conductive component, which is usually made of metal, such as aluminum or copper; the second hollow sub-component 82 is used as an insulating component, which is usually made of plastic or rubber with good thermal conductivity; each segment of the first hollow sub-component 81 is connected to the terminal adapter 7 of different polarities of two adjacent single cells 4, and each segment of the second hollow sub-component 82 is connected between adjacent first hollow sub-components 81.

[0119] Combination Figure 16 and Figure 17 As can be seen, in this embodiment, after the first sub-hollow component 81 and the second sub-hollow component 82 complete the series connection of each individual cell 4, two heat exchange channels are formed on the top of each individual cell 4. The two heat exchange channels are connected in series through an insulated external pipe. In some other embodiments, the two heat exchange channels can be connected in parallel.

[0120] To further improve the heat dissipation performance of the heat transfer tube assembly 8, this embodiment may also provide heat dissipation teeth in the first sub-hollow component 81 and / or the second sub-hollow component 82. Multiple heat dissipation teeth are arranged circumferentially along the first sub-hollow component 81 and / or the second sub-hollow component 82, and each heat dissipation tooth extends circumferentially along the first sub-hollow component 81 and / or the second sub-hollow component 82.

[0121] In addition, in order to optimize the conductivity of the first sub-hollow component 81, a metal conductive and thermally conductive layer 83 is added between the first sub-hollow component 81 and the through slot in this embodiment. The metal conductive and thermally conductive layer 83 is usually made of a metal material with good conductivity and thermal conductivity, such as solder material. The solder material can be melted and poured between the first sub-hollow component 81 and the through slot. After cooling, a solder layer is formed between the first sub-hollow component 81 and the through slot.

[0122] When the gap between the first hollow component 81 and the through slot is too small, molten solder cannot easily flow into the gap. To overcome this problem, a solder sheet can be pre-wrapped around the first hollow component 81, then inserted into the through slot, and heated. The molten solder sheet melts and solders the first hollow component 81 and the through slot. These two methods can also be used in combination: a solder sheet is wrapped around the first hollow component 81, then inserted into the through slot; the solder material is then melted and poured between the first hollow component 81 and the through slot; it is heated again, the solder sheet melts, and after cooling, the soldering of the first hollow component 81 and the through slot is achieved.

[0123] By setting a metal conductive and thermally conductive layer 83, the bonding strength and thermal conductivity between the first sub-hollow component 81 and the pole adapter 7 can be further improved.

Claims

1. A venting manifold assembly for a battery module, the battery module comprising m individual cells arranged in the same direction; wherein, m is an integer greater than 1; its characteristic is: Includes hollow pipe fittings and connecting parts; At least one through hole is formed on the first tube wall of the hollow tube, penetrating its inner cavity. The inner cavity of the hollow tube serves as a confluence channel for thermal runaway flue gas and is connected to the explosion venting section of each individual battery cell through the first through hole. The connecting part is located on the hollow tube and is used to connect to the battery module.

2. The explosion-venting busbar assembly for a battery module according to claim 1, characterized in that: There are m first through holes, which are arranged along the length of the hollow tube and correspond one-to-one with the explosion venting parts on the m individual batteries. The inner cavity of the hollow tube is connected to the corresponding explosion venting parts through the m first through holes.

3. The explosion-venting busbar assembly for battery modules according to claim 2, characterized in that: The connecting part includes two connecting plates; the two connecting plates are respectively fixed on two opposite third pipe walls of the hollow pipe fitting and extend along the length of the hollow pipe fitting.

4. The explosion-venting busbar assembly for a battery module according to claim 3, characterized in that: Both connecting plates have n second through holes, which are arranged along the length of the connecting plates, where n is an integer greater than 1.

5. The explosion-venting busbar assembly for a battery module according to any one of claims 1-4, characterized in that: It also includes a flexible base plate, which is used to be installed between the hollow tube and the connecting part and the top cover of the single battery cell; the flexible base plate is provided with a third through hole that corresponds to and penetrates the first through hole.

6. A battery module comprising m individual battery cells arranged in the same direction, characterized in that: It also includes the explosion-venting manifold assembly for battery modules as described in any one of claims 1 to 5; The explosion venting manifold assembly is fixed to the top of the battery module via a connector.

7. The battery module according to claim 6, characterized in that: It also includes locking components and a partition; the top of the partition is provided with a fixing post; the fixing post corresponds to the second through hole on the connecting plate; The separator is clamped and fixed between adjacent individual cells, the fixing post protrudes through the corresponding second through hole, and the locking member is locked at the part of the fixing post that protrudes through the second through hole.

8. The battery module according to claim 7, characterized in that: Two limiting plates are also provided at the bottom of the separator; both limiting plates are perpendicular to the separator body and parallel to the lower cover of the individual battery. The two limiting plates extend to different sides of the separator body and limit the lower cover of two adjacent individual batteries.

9. The battery module according to claim 7, characterized in that: A sealing layer is provided between the flexible base plate and the cover plate of each individual battery cell; a sealing layer is provided between the hollow tube and the connecting plate and the flexible base plate.

10. The battery module according to claim 6, characterized in that: It also includes a pole heat exchange device; the pole heat exchange device includes a heat transfer tube assembly and pole adapters corresponding to each pole. The pole adapter has a through groove, and the pole adapter is fixed on the corresponding pole. The inner cavity of the heat transfer tube assembly serves as a flow channel for the heat exchange medium, and is fitted into the through groove, forming two heat exchange channels at the top of the battery module.

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