Battery monomer and battery pack

Abstract

The embodiment of the invention provides a battery monomer and a battery pack. The battery monomer comprises a shell, a mounting cavity is defined by the shell, the shell comprises a first wall, a pressure relief opening is formed in the first wall, and a pressure relief piece is mounted in the pressure relief opening; the battery core assembly is mounted in the mounting cavity; the exhaust support is arranged between the battery cell assembly and the first wall, a boss is arranged on the side, facing the first wall, of the exhaust support, the boss is connected with the first wall, so that a gap is formed between the exhaust support and the first wall, the gap is communicated with the pressure relief opening, and the exhaust support is provided with a plurality of exhaust holes communicated with the gap and the air flow channel of the battery cell assembly. Therefore, the battery cell assembly and the shell are always provided with the airflow channel, so that a large amount of high-temperature gas generated during thermal runaway of the single battery can be timely discharged from the pressure relief part, the single battery is prevented from exploding, and the safety of the single battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a battery cell and battery pack. Background Technology

[0002] During module operation, the positive and negative electrode materials and electrolyte of the cell components inside the battery cell react to generate high-temperature and high-pressure gas. However, because the connection between the cell components and the casing inside the battery cell is relatively tight and there is basically no airflow channel, the flow rate of the high-temperature and high-pressure gas is slow. As a result, when the battery cell experiences thermal runaway, a large amount of high-temperature gas cannot be discharged from the explosion-proof parts in time, leading to the battery cell exploding and easily affecting the safety of the battery cell. Summary of the Invention

[0003] To address or partially address the aforementioned problems, this invention discloses a battery cell and a battery pack to solve the problem in the prior art where a large amount of high-temperature gas generated during thermal runaway of a battery cell cannot be discharged from the explosion-proof component in a timely manner.

[0004] To address the above problems, this application provides a battery cell, which includes: A housing, the housing being configured to form an installation cavity, the housing including a first wall, the first wall having a pressure relief port, and a pressure relief component installed in the pressure relief port; A battery cell assembly, wherein the battery cell assembly is installed in the mounting cavity; An exhaust bracket is disposed between the battery cell assembly and the first wall. A boss is provided on the side of the exhaust bracket facing the first wall. The boss is connected to the first wall to create a gap between the exhaust bracket and the first wall. The gap is connected to the pressure relief port. The exhaust bracket is provided with multiple exhaust holes that connect the gap and the airflow channel of the battery cell assembly.

[0005] Optionally, the battery cell has a first orientation, and the exhaust bracket includes a first insulating plate and a second insulating plate; The first insulating plate and the second insulating plate are stacked together, and the second insulating plate is located between the first insulating plate and the first wall; The first wall has an inner surface facing the cell assembly, and the projected area of ​​the second insulating plate on the inner surface along the first direction is smaller than the projected area of ​​the first insulating plate on the inner surface along the first direction. The second insulating plate forms the boss. Wherein, the first direction is a direction perpendicular to the inner surface; The first insulating plate has the exhaust hole, or both the first insulating plate and the second insulating plate have the exhaust hole.

[0006] Optionally, the exhaust bracket further includes a connecting layer, through which the first insulating plate and the second insulating plate are bonded together.

[0007] Optionally, the orthographic projection area of ​​the connecting layer on the inner surface along the first direction is smaller than the orthographic projection area of ​​the second insulating plate on the inner surface along the first direction.

[0008] Optionally, the first insulating plate and the second insulating plate are joined by heat fusion.

[0009] Optionally, the battery cell has a first orientation, which is perpendicular to the first wall, and the exhaust bracket further includes a patch; The exhaust bracket has an installation slot along the first direction directly opposite the pressure relief port. The patch is attached to the slot of the installation slot facing the pressure relief port. When the amount of high-temperature and high-pressure gas generated by the battery cell assembly exceeds a preset value, the patch will fall off from the installation slot.

[0010] Optionally, the exhaust bracket includes a first insulating plate and a second insulating plate; The first insulating plate and the second insulating plate are stacked together, and the second insulating plate is located between the first insulating plate and the first wall; The mounting slot is formed on the first insulating plate.

[0011] Optionally, the battery cell also has a second direction, which is the length direction of the first insulating plate. The first insulating plate has a plurality of vent holes, and the vent holes are evenly distributed on both sides of the mounting slot in the second direction.

[0012] Optionally, the battery cell also has a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the second insulating plate includes a first insulating strip and a second insulating strip, both of which are installed on the surface of the first insulating plate facing the first wall; The first insulating strip and the second insulating strip are located on both sides of the mounting slot in the third direction, and the orthographic projection of the vent hole in the first direction is located between the orthographic projection of the first insulating strip in the first direction and the orthographic projection of the second insulating strip in the first direction.

[0013] Optionally, a recessed groove is provided at the opening of the mounting through groove facing the first wall; The patch is adhered to the settling tank.

[0014] Optionally, the dimension of the sink in the first direction is T1, and the dimension of the patch in the first direction is smaller than the dimension of the sink in the first direction, T2, wherein 0.15 mm ≤ T1 ≤ 0.3 mm.

[0015] Optionally, the mounting groove wall is provided with a snap-fit ​​groove. The patch is snapped into the snap-fit ​​slot.

[0016] Optionally, the housing includes a first housing and a first cover plate; The top of the first housing has an opening, the first cover plate covers the opening, the first cover plate and the first housing form the mounting cavity, and the first wall is the bottom wall of the first housing.

[0017] Optionally, the battery cell further has a second direction, which is the length direction of the first wall, and the housing includes a second housing, a second cover plate, and a third cover plate; The second housing has a first opening and a second opening at both ends along the second direction; The second cover plate covers the first opening, and the third cover plate covers the second opening. The second housing, the second cover plate, and the third cover plate surround the mounting cavity, and the first wall is the bottom wall of the second housing.

[0018] In some embodiments, this application also provides a battery pack, the battery pack including a housing and a battery cell as described in any of the above embodiments, the battery cell being disposed in the housing.

[0019] According to the embodiments of this application, since the housing forms an installation cavity, and the housing includes a first wall with a pressure relief port, a pressure relief component is installed in the pressure relief port. Therefore, the high-temperature and high-pressure gas generated by the battery cell assembly can be discharged through the pressure relief component at the pressure relief port. Furthermore, since the exhaust bracket is located between the battery cell assembly and the first wall, and a boss is provided on the side of the exhaust bracket facing the first wall, a gap exists between the exhaust bracket and the first wall through the boss. This allows the high-temperature and high-pressure gas generated by the battery cell assembly to sequentially pass through the exhaust holes on the exhaust bracket, through the gap between the exhaust bracket and the first wall, to reach the pressure relief port, and then be discharged through the pressure relief component in the pressure relief port. In this way, the battery cell assembly and the housing always have an airflow channel, ensuring that the large amount of high-temperature gas generated by the battery cell during thermal runaway can be discharged from the pressure relief component in a timely manner, preventing the battery cell from exploding and improving the safety of the battery cell. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application; Figure 2 This application provides a battery cell along... Figure 1 A schematic diagram of the cross-sectional structure along the AA direction; Figure 3 This application provides an embodiment of a battery cell in which... Figure 2 A magnified view of point B in the diagram; Figure 4 This is an exploded view of a single battery cell provided in an embodiment of this application; Figure 5 This is a schematic diagram of another battery cell structure provided in an embodiment of this application; Figure 6 This application provides another battery cell along the embodiment. Figure 5 A schematic diagram of the cross-sectional structure in the CC direction; Figure 7 This is another type of battery cell provided in the embodiments of this application. Figure 5 A magnified view of a portion of point D in the diagram; Figure 8 This is an exploded view of another battery cell provided in an embodiment of this application; Figure 9 This is an exploded view of the exhaust bracket included in the battery cell provided in the embodiments of this application; Figure 10 This is a schematic diagram of the structure of the first type of exhaust bracket included in the battery cell provided in the embodiments of this application; Figure 11 The battery cell provided in this application includes a first type of exhaust bracket along... Figure 10 A cross-sectional view along the EE direction in the middle; Figure 12 This is a schematic diagram of the structure of the second type of exhaust bracket included in the battery cell provided in the embodiments of this application; Figure 13 The second type of exhaust bracket included in the battery cell provided in this application embodiment is along Figure 12 A cross-sectional view along the FF direction in the image; Figure 14 This is a schematic diagram of the third type of exhaust bracket included in the battery cell provided in the embodiments of this application; Figure 15 The battery cell provided in this application includes a third type of exhaust bracket along... Figure 14 Cross-sectional view along the HH direction; Figure 16 The battery cell provided in this application includes a third type of exhaust bracket. Figure 15 A magnified view of point I in the image; Figure 17 This is a schematic diagram of the third type of exhaust bracket included in the battery cell provided in the embodiments of this application; Figure 18 The battery cell provided in this application includes a third type of exhaust bracket along... Figure 17 Cross-sectional view in the JJ direction; Figure 19 The battery cell provided in this application includes a third type of exhaust bracket. Figure 15 A magnified view of point K in the image.

[0022] Explanation of reference numerals in the attached figures: 1: Housing; 11: First wall; 111: Pressure relief port; 112: Inner surface; 12: Gap; 13: First housing; 14: First cover plate; 15: Second housing; 16: Second cover plate; 17: Third cover plate; 2: Pressure relief component; 3: Battery cell assembly; 4: Exhaust bracket; 41: Exhaust hole; 42: First insulating plate; 421: Mounting slot; 4211: Recessed groove; 4212: Snap-fit ​​groove; 43: Second insulating plate; 431: First insulating strip; 432: Second insulating strip; 44: Connecting layer; 45: Patch; 46: Boss. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0025] like Figures 1 to 4As shown in the figure, this application provides a battery cell, which includes a housing 1, a cell assembly 3, and an exhaust bracket 4.

[0026] The housing 1 forms an installation cavity. The housing 1 includes a first wall 11, and the first wall 11 has a pressure relief port 111. A pressure relief component 2 is installed in the pressure relief port 111.

[0027] The battery cell assembly 3 is installed in the mounting cavity.

[0028] The exhaust bracket 4 is disposed between the battery cell assembly 3 and the first wall 11. The side of the exhaust bracket 4 facing the first wall is provided with a boss 46 so that there is a gap 12 between the exhaust bracket 4 and the first wall 11. The gap 12 is connected to the pressure relief port 111. The exhaust bracket 4 is provided with a plurality of exhaust holes 41 that connect the gap 12 and the airflow channel of the battery cell assembly 3.

[0029] As can be seen from the above embodiments, in this application embodiment, since the housing 1 forms an installation cavity, the housing 1 includes a first wall 11, the first wall 11 has a pressure relief port 111, and a pressure relief component 2 is installed in the pressure relief port 111. The battery cell assembly 3 is installed in the installation cavity, so the high-temperature and high-pressure gas generated by the battery cell assembly 3 can be discharged through the pressure relief component 2 provided at the pressure relief port 111. Furthermore, since the exhaust bracket 4 is provided between the battery cell assembly 3 and the first wall 11, and the side of the exhaust bracket 4 facing the first wall 11 has a boss 46, the boss 46 creates a gap 12 between the exhaust bracket 4 and the first wall 11, so that the high-temperature and high-pressure gas generated by the battery cell assembly 3 can sequentially pass through the exhaust hole 41 provided on the exhaust bracket 4, the gap 12 between the exhaust bracket 4 and the first wall 11, reach the pressure relief port 111, and then be discharged through the pressure relief component 2 in the pressure relief port 111. This ensures that the cell assembly 3 and the casing 1 always have airflow channels, guaranteeing that the large amount of high-temperature gas generated by the battery cell during thermal runaway can be discharged from the pressure relief component 2 in a timely manner, preventing the battery cell from exploding and improving the safety of the battery cell.

[0030] The housing 1 may include structures such as a housing, cover plate, end plate, frame, and electrical connectors. The encapsulation structure is used to protect the safety of the battery cell assembly 3, maintain the stability of the internal environment of the battery cell assembly 3, and ensure sealing. The encapsulation structure is a cuboid housing structure with an inner cavity. The pressure relief port 111 is provided on the first wall 11. The first wall 11 can be any side wall of the encapsulation structure. The pressure relief component 2 provided in the pressure relief port 111 may include any pressure relief structure such as an explosion-proof valve, a vent valve, and a breather valve. This application embodiment does not limit this.

[0031] The exhaust bracket 4 is a single-layer or multi-layer plate-like structure, or a frame-like structure, etc., with a boss 46. The surface of the exhaust bracket 4 facing the first wall 11 has a boss 46. This boss 46 can be a protrusion formed on the exhaust bracket 4, or an external protrusion on the exhaust bracket 4; this embodiment does not limit this. The boss 46 creates a gap 12 between the exhaust bracket 4 and the first wall 11. An exhaust hole 41 is provided on the exhaust bracket 4. This exhaust hole 41 can be any shape, such as a round hole, a square hole, or an irregularly shaped hole; this embodiment does not limit this. Thus, the gap 12 between the exhaust bracket 4 and the first wall 11 connects the exhaust hole 41 and the pressure relief port, allowing the high-temperature, high-pressure gas generated by the battery cell assembly 3 to smoothly reach the pressure relief component 2.

[0032] Regarding the structure of the exhaust bracket 4, in some embodiments, such as Figure 9 As shown, the battery cell has a first direction Z. The venting bracket 4 includes a first insulating plate 42 and a second insulating plate 43, which are stacked together. The second insulating plate 43 is located between the first insulating plate 42 and the first wall 11. The first wall 11 has an inner surface 112 facing the cell assembly 3. The projected area of ​​the second insulating plate 43 along the first direction Z on the inner surface 112 is smaller than the projected area of ​​the first insulating plate 42 along the first direction Z on the inner surface 112. The second insulating plate 43 forms a boss 46. The first direction Z is perpendicular to the inner surface 112. The first insulating plate 42 has a vent hole 41, or both the first insulating plate 42 and the second insulating plate 43 have vent holes 41.

[0033] In this embodiment, since the second insulating plate 43 is located between the first insulating plate 42 and the first wall 11, and the first wall 11 has an inner surface 112 facing the cell assembly 3, the projected area of ​​the second insulating plate 43 along the first direction Z on the inner surface 112 is smaller than the projected area of ​​the first insulating plate 42 along the first direction Z on the inner surface 112. Therefore, the second insulating plate 43 protrudes from the first insulating plate 42 and is positioned towards the first wall 111, thus forming a boss 46 on the second insulating plate 43. Consequently, under the action of the second insulating plate 43, a gap 12 is formed between the first insulating plate 42 and the first wall 111, ensuring that the cell assembly 3 and the housing 1 always have an airflow channel, and ensuring that the high-temperature and high-pressure gas generated by the cell assembly 3 can be smoothly discharged.

[0034] Furthermore, it should be noted that the location of the vent hole 41 is determined based on the structure of the second insulating plate 43. If the second insulating plate 43 is a plate-like structure composed of multiple strip structures, the vent hole 41 can be opened only on the first insulating plate 42, aligning the vent hole 41 with the gap 12 between two adjacent second insulating plates 43. If the second insulating plate 43 is a plate-like structure with the same shape as the first insulating plate 42, the vent hole 41 needs to penetrate both the first and second insulating plates 42, meaning both the first and second insulating plates 42 and 43 have vent holes 41. This application embodiment does not limit this. The first insulating plate 42 and the second insulating plate 43 can be insulating materials such as polypropylene, polyphenylene sulfide, and polyethylene terephthalate. This application embodiment does not limit this. It should also be noted that the first insulating plate 42 and the second insulating plate 43 can be directly connected or indirectly connected through other connectors. This application embodiment does not limit this.

[0035] Regarding the connection method between the first insulating plate 42 and the second insulating plate 43, such as Figures 9 to 11 As shown, in one possible implementation, the exhaust bracket further includes a connecting layer 44, through which the first insulating plate 42 and the second insulating plate 43 are bonded. This allows the first insulating plate 42 and the second insulating plate 43 to form a single unit, which not only facilitates the fabrication of the exhaust bracket 4 but also reduces the overall weight of the exhaust bracket 4. It should be noted that the connecting layer 44 can be an adhesive material such as glue, double-sided tape, or a locking agent; this embodiment does not limit the specific materials used.

[0036] When the first insulating plate 42 and the second insulating plate 43 are connected according to the above embodiments, in some embodiments, the orthographic projection area of ​​the connecting layer 44 along the first direction Z on the inner surface 112 is smaller than the orthographic projection area of ​​the second insulating plate 43 along the first direction Z on the inner surface 112. This prevents the connecting layer 44 from leaking out, improves the connection stability between the first insulating plate 42 and the second insulating plate 43, and avoids the connecting layer 44 affecting the flow state of the vent hole 41.

[0037] Regarding the connection method between the first insulating plate 42 and the second insulating plate 43, such as Figure 12 and Figure 13 As shown, in another possible implementation, the first insulating plate 42 and the second insulating plate 43 are connected by heat fusion. This allows for direct connection between the first insulating plate 42 and the second insulating plate 43, eliminating the need for the connecting layer 44 between them. This prevents adhesion between multiple exhaust brackets 4 due to the presence of the connecting layer 44, thereby increasing the output of the exhaust brackets 4.

[0038] In some embodiments, such as Figure 3and Figure 7 As shown, the battery cell has a first direction Z, which is perpendicular to the first wall 11. The exhaust bracket 4 also includes a patch 45. The exhaust bracket 4 has a mounting groove 421 at the position of the pressure relief port 111 along the first direction Z. The patch 45 is attached to the groove of the mounting groove 421 facing the pressure relief port 111. When the amount of high temperature and high pressure gas generated by the battery cell assembly 3 exceeds the preset value, the patch 45 falls off from the mounting groove 421.

[0039] In this embodiment, since the exhaust bracket 4 has an installation slot 421 at the position directly opposite the pressure relief port 111 along the first direction Z, and the patch 45 is attached to the slot of the installation slot 421 facing the pressure relief port 111, on the one hand, the patch 45 can block the pressure relief port 111, preventing foreign objects inside the cell assembly 3 from directly contacting the explosion-proof valve inside the pressure relief port 111, thus preventing the insulation failure of the cell assembly 3. On the other hand, when the amount of high-temperature and high-pressure gas generated by the cell assembly 3 exceeds the preset value, the high-temperature and high-pressure gas can blow open the patch 45, allowing the installation slot 421 to also discharge the high-temperature and high-pressure gas, further improving the pressure relief efficiency of the battery cell in the event of thermal failure.

[0040] It should be noted that the patch 45 can be made of insulating materials such as polypropylene, polyphenylene sulfide, and polyethylene terephthalate, and this application embodiment does not limit this. Furthermore, the preset value in this application embodiment is the maximum safe threshold that the cell assembly 3 can withstand when generating high-temperature, high-pressure gas; that is, if the amount of high-temperature, high-pressure gas generated by the cell assembly 3 exceeds the preset value, the battery cell will experience thermal runaway.

[0041] In some embodiments, such as Figure 3 , Figure 7 and Figure 9 As shown, the exhaust bracket 4 includes a first insulating plate 42 and a second insulating plate 43, which are stacked together. The second insulating plate 43 is located between the first insulating plate 42 and the first wall 11. A mounting slot 421 is formed on the first insulating plate 42. In this way, the mounting slot 421 is formed only on the first insulating plate 42, which reduces the installation difficulty of the patch 45 and reduces the thickness of the patch 45 in the first direction Z. This makes it easier to separate the patch 45 from the mounting slot 421 when the amount of high-temperature and high-pressure gas generated by the cell assembly 3 exceeds the preset value. It also avoids affecting the smoothness of the exhaust channel between the first insulating plate 42 and the pressure relief port 111 due to the setting of the patch 45.

[0042] Based on the structure of the aforementioned venting bracket 4, in some embodiments, the battery cell also has a second direction X, which is the length direction of the first insulating plate 42. The first insulating plate 42 has multiple venting holes 41, and the venting holes 41 are evenly distributed on both sides of the mounting slot 421 in the second direction X. In this way, the mounting slot 421 and the pressure relief port are positioned relative to each other in the first direction Z, which facilitates the mounting patch 45 installed in the mounting slot 421 to be aligned with the pressure relief port. At the same time, the venting holes 41 are evenly distributed, ensuring that the battery cell assembly 3 can vent gas evenly through the venting holes 41, thus ensuring the uniformity and efficiency of the venting of the battery cell assembly 3.

[0043] Regarding the structure of the second insulating plate 43, as follows: Figure 9 As shown, in some embodiments, the battery cell also has a third direction Y, and the first direction Z, the second direction X and the third direction Y are perpendicular to each other. The second insulating plate 43 includes a first insulating strip 431 and a second insulating strip 432. The first insulating strip 431 and the second insulating strip 432 are both installed on the surface of the first insulating plate 42 facing the first wall 11. The first insulating strip 431 and the second insulating strip 432 are located on both sides of the mounting groove 421 in the third direction Y. The orthographic projection of the vent hole 41 in the first direction Z is located between the orthographic projection of the first insulating strip 431 in the first direction Z and the orthographic projection of the second insulating strip 432 in the first direction Z.

[0044] In this embodiment, since the first insulating strip 431 and the second insulating strip 432 are both installed on the surface of the first insulating plate 42 facing the first wall 11, and the first insulating strip 431 and the second insulating strip 432 are located on both sides of the mounting groove 421 in the third direction Y, the orthographic projection of the exhaust hole 41 in the first direction Z is located between the orthographic projection of the first insulating strip 431 in the first direction Z and the orthographic projection of the second insulating strip 432 in the first direction Z. Therefore, the first insulating strip 431 and the second insulating strip 432 can form a boss 46 to ensure a stable airflow channel between the first insulating plate 42 and the first wall 11, and the installation difficulty between the first insulating plate 42 and the second insulating plate 43 can be reduced. Furthermore, the gap 12 between the first insulating plate 42 and the first wall 11 is the space between the first insulating strip 431 and the second insulating strip 432, and the gap 12 between the first insulating plate 42 and the first wall 11 always corresponds to the pressure relief port 111, ensuring the stability of the exhaust of the battery cell assembly 3.

[0045] It should be noted that the first insulating strip 431 and the second insulating strip 432 can be connected to the first insulating plate 42 through the connecting layer 44, or they can be directly connected to the first insulating plate 42 through heat fusion connection. This application embodiment does not limit this.

[0046] It should also be noted that the patch 45 can be embedded in the mounting slot 421, or it can be glued to the mounting slot 421, or it can be detachably fixed in the mounting slot 421 by other means. This application embodiment does not limit this.

[0047] For the mounting of patch 45, in some embodiments, such as Figures 14 to 16 As shown, a recessed groove 4211 is formed at the opening of the mounting slot 421 facing the first wall 11, and the patch 45 is bonded in the recessed groove 4211. In this way, the bonding between the patch 45 and the recessed groove 4211 can ensure the stability of the connection between the patch 45 and the mounting slot 421, and also ensure that the patch 45 can be easily blown away by the high-temperature and high-pressure gas when the amount of high-temperature and high-pressure gas generated by the battery cell assembly 3 exceeds the preset value.

[0048] In some embodiments, such as Figure 16 As shown, the dimension of the recess 4211 in the first direction Z is T1, and the dimension of the patch 45 in the first direction Z is smaller than the dimension T2 of the recess 4211 in the first direction Z, wherein 0.15 mm ≤ T1 ≤ 0.3 mm. This avoids the patch 45 being larger than the recess 4211 in the first direction Z by T2, preventing assembly interference between the patch 45 and the recess 4211. It also ensures the venting area of ​​the mounting slot 421 and prevents the first insulating plate 42 from losing strength due to an excessively large dimension of the recess 4211 in the first direction Z, thus guaranteeing the overall strength of the venting bracket 4.

[0049] In some embodiments, such as Figures 17 to 19 As shown, a snap-fit ​​groove 4212 is provided on the groove wall of the mounting slot 421, and the patch 45 is snapped into the snap-fit ​​groove 4212. This allows the patch 45 to be directly snapped into the mounting slot 421, which facilitates the installation of the patch 45, reduces the installation cost, and ensures that the patch 45 can be easily blown away by the high-temperature, high-pressure gas generated by the battery cell assembly 3 when the amount exceeds a preset value, thereby improving the exhaust rate. It should be noted that in this embodiment, a shoulder can be first formed at the bottom of the snap-fit ​​groove 4212 facing the pressure relief port, and then the snap-fit ​​groove 4212 can be formed at the shoulder, so that the patch 45 is snapped into the snap-fit ​​groove 4212.

[0050] Regarding the structure of housing 1, in one possible implementation, such as Figures 1 to 4As shown, the housing 1 includes a first housing 13 and a first cover plate 14. The top of the first housing 13 has an opening, and the first cover plate 14 covers the opening. The first cover plate 14 and the first housing 13 enclose a mounting cavity, and the first wall 11 is the bottom wall of the first housing 13. This arrangement positions the first cover plate 14 at the opening of the first housing 13. After the battery cell's terminals are installed on the first cover plate 14, the terminals of the battery cells are arranged on the same side. This reduces the space occupied by the battery cells in the first direction Z, improves the effective space utilization of the battery cells, simplifies the battery cell manufacturing process, and shortens the current transmission path, reducing the internal resistance of the battery cells and reducing energy loss.

[0051] In some embodiments, the first housing 13 and the first cover plate 14 have pressure relief ports 111 on their opposite sidewalls in the first direction Z. This positions the pressure relief component 2 and the first cover plate 14 relative to each other in the first direction Z. After the battery cell's terminal post is installed on the first cover plate 14, the terminal post and the pressure relief component 2 are positioned relative to each other in the first direction Z. In this way, when thermal runaway occurs in the battery cell, high-temperature and high-pressure gas can be discharged through the pressure relief component 2 at the bottom of the battery cell. This facilitates gas venting and reduces the safety risk of significant damage to the battery structure during thermal runaway.

[0052] Regarding the structure of housing 1, in another possible implementation, such as Figures 5 to 8 As shown, the housing 1 includes a second housing 15, a second cover plate 16, and a third cover plate 17. The second housing 15 has a first opening and a second opening at both ends along the second direction X. The second cover plate 16 covers the first opening, and the third cover plate 17 covers the second opening. The second housing 15, the second cover plate 16, and the third cover plate 17 form an installation cavity. The first wall 11 is the bottom wall of the second housing 15. In this embodiment, the first cover plate 14 and the second cover plate 16 are located on different sides of the first cover. With a positive terminal post on the first cover plate 14 and a negative terminal post on the second cover plate 16, the positive and negative terminals of the battery cell are located on different sides. This not only improves the heat dissipation efficiency of the battery cell but also optimizes production efficiency. Since the first wall 11 is the bottom wall of the second housing 15, a pressure relief port 111 is provided on the side wall with the smallest surface area in the second housing 15. In this way, the pressure relief device can be located on the smallest side wall of the battery cell's casing. This not only allows the high-temperature and high-pressure gas to be discharged in a timely manner through the pressure relief device 2, but also reduces the sealing difficulty required due to the setting of the pressure relief device 2, thereby reducing the overall sealing difficulty of the battery cell.

[0053] As can be seen from the above embodiments, in this application embodiment, since the housing 1 forms an installation cavity, the housing 1 includes a first wall 11, the first wall 11 has a pressure relief port 111, and a pressure relief component 2 is installed in the pressure relief port 111. The battery cell assembly 3 is installed in the installation cavity, so the high-temperature and high-pressure gas generated by the battery cell assembly 3 can be discharged through the pressure relief component 2 provided at the pressure relief port 111. Furthermore, since the exhaust bracket 4 is located between the battery cell assembly 3 and the first wall 11, and the side of the exhaust bracket 4 facing the first wall 11 has a boss 46, the boss 46 creates a gap 12 between the exhaust bracket 4 and the first wall 11. This allows the high-temperature and high-pressure gas generated by the battery cell assembly 3 to pass sequentially through the exhaust hole 41 on the exhaust bracket 4, through the gap 12 between the exhaust bracket 4 and the first wall 11, to reach the pressure relief port, and then be discharged through the pressure relief component 2 in the pressure relief port. In this way, the battery cell assembly 3 and the housing 1 always have an airflow channel, ensuring that the large amount of high-temperature gas generated by the battery cell during thermal runaway can be discharged in time from the pressure relief component 2, preventing the battery cell from exploding and improving the safety of the battery cell.

[0054] Furthermore, this application also provides a battery pack, which includes a housing and individual battery cells as described in any of the above embodiments, with the individual battery cells housed within the housing. The beneficial effects of this battery pack are the same as those of the individual battery cells described above, and will not be repeated here.

[0055] The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0057] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0058] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery cell, characterized in that, The battery cell includes: A housing, the housing being configured to form an installation cavity, the housing including a first wall, the first wall having a pressure relief port, and a pressure relief component installed in the pressure relief port; A battery cell assembly, wherein the battery cell assembly is installed in the mounting cavity; An exhaust bracket is disposed between the battery cell assembly and the first wall. A boss is provided on the side of the exhaust bracket facing the first wall. The boss is connected to the first wall to create a gap between the exhaust bracket and the first wall. The gap is connected to the pressure relief port. The exhaust bracket is provided with multiple exhaust holes that connect the gap and the airflow channel of the battery cell assembly.

2. The battery cell according to claim 1, characterized in that, The battery cell has a first orientation, and the exhaust bracket includes a first insulating plate and a second insulating plate. The first insulating plate and the second insulating plate are stacked together, and the second insulating plate is located between the first insulating plate and the first wall; The first wall has an inner surface facing the cell assembly, and the projected area of ​​the second insulating plate on the inner surface along the first direction is smaller than the projected area of ​​the first insulating plate on the inner surface along the first direction. The second insulating plate forms the boss. Wherein, the first direction is a direction perpendicular to the inner surface; The first insulating plate has the exhaust hole, or both the first insulating plate and the second insulating plate have the exhaust hole.

3. The battery cell according to claim 2, characterized in that, The exhaust bracket also includes a connecting layer, through which the first insulating plate and the second insulating plate are bonded together.

4. The battery cell according to claim 3, characterized in that, The area of ​​the connecting layer projected onto the inner surface along the first direction is smaller than the area of ​​the second insulating plate projected onto the inner surface along the first direction.

5. The battery cell according to claim 2, characterized in that, The first insulating plate and the second insulating plate are connected by heat fusion.

6. The battery cell according to claim 1, characterized in that, The battery cell has a first direction, which is perpendicular to the first wall, and the exhaust bracket also includes a patch; The exhaust bracket has an installation slot along the first direction directly opposite the pressure relief port. The patch is attached to the slot of the installation slot facing the pressure relief port. When the amount of high-temperature and high-pressure gas generated by the battery cell assembly exceeds a preset value, the patch will fall off from the installation slot.

7. The battery cell according to claim 6, characterized in that, The exhaust bracket includes a first insulating plate and a second insulating plate; The first insulating plate and the second insulating plate are stacked together, and the second insulating plate is located between the first insulating plate and the first wall; The mounting slot is formed on the first insulating plate.

8. The battery cell according to claim 7, characterized in that, The battery cell also has a second direction, which is the length direction of the first insulating plate. The first insulating plate has a plurality of vent holes, and the vent holes are evenly distributed on both sides of the mounting slot in the second direction.

9. The battery cell according to claim 8, characterized in that, The battery cell also has a third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The second insulating plate includes a first insulating strip and a second insulating strip, and the first insulating strip and the second insulating strip are both installed on the surface of the first insulating plate facing the first wall. The first insulating strip and the second insulating strip are located on both sides of the mounting slot in the third direction, and the orthographic projection of the vent hole in the first direction is located between the orthographic projection of the first insulating strip in the first direction and the orthographic projection of the second insulating strip in the first direction.

10. The battery cell according to claim 6, characterized in that, The mounting groove has a recessed groove at the opening facing the first wall; The patch is adhered to the settling tank.

11. The battery cell according to claim 10, characterized in that, The dimension of the sink in the first direction is T1, and the dimension of the patch in the first direction is smaller than the dimension of the sink in the first direction, T2, wherein 0.15 mm ≤ T1 ≤ 0.3 mm.

12. The battery cell according to claim 6, characterized in that, The mounting slot has a snap-fit ​​groove on its wall. The patch is snapped into the snap-fit ​​slot.

13. The battery cell according to any one of claims 1 to 12, characterized in that, The housing includes a first housing and a first cover plate; The top of the first housing has an opening, the first cover plate covers the opening, the first cover plate and the first housing form the mounting cavity, and the first wall is the bottom wall of the first housing.

14. The battery cell according to any one of claims 1 to 12, characterized in that, The battery cell also has a second direction, which is the length direction of the first wall, and the housing includes a second housing, a second cover plate and a third cover plate; The second housing has a first opening and a second opening at both ends along the second direction; The second cover plate covers the first opening, and the third cover plate covers the second opening. The second housing, the second cover plate, and the third cover plate surround and form the mounting cavity. The first wall is the bottom wall of the second shell.

15. A battery pack, characterized in that, The battery pack includes a housing and individual battery cells as described in any one of claims 1 to 14, wherein the individual battery cells are disposed within the housing.

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