Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, the single battery has a first direction, the single battery comprises a shell, a cover plate, a pressure relief piece and a protective layer, and the cover plate is connected with one end of the shell along the first direction; the shell is provided with a bottom plate opposite to the cover plate in the first direction, a first groove is formed in the side, away from the cover plate, of the bottom plate, the first groove is provided with a first bottom wall, and the first bottom wall is provided with a second groove and communicated with the first groove; the second groove is provided with a second bottom wall, the second bottom wall is provided with a first through hole penetrating in the first direction, and the first through hole is communicated with the second groove; the pressure relief piece is at least partially arranged in the second groove and is connected with the second bottom wall so as to cover and seal the first through hole; the protective layer is arranged in the first groove and is connected with the first bottom wall so as to cover and seal the second groove; the protection layer and the pressure relief piece are arranged at intervals. The pressure relief piece is arranged in the second groove, and the protection layer is arranged in the first groove, so that the flatness of the surface of the bottom plate can be ensured, and the single batteries can be conveniently conveyed and circulated on a production line.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a single cell battery and a battery pack. Background Technology

[0002] With the development and application of lithium battery technology, the safety requirements for battery cells are becoming increasingly stringent. When the terminal post faces upwards and the explosion-proof valve faces downwards towards the underside of the vehicle chassis, the valve opening and air release can reduce the risk of injury to personnel. However, when the explosion-proof valve is positioned downwards, it protrudes from the lower surface of the battery cell, reducing the flatness of the battery surface and thus affecting the battery's transfer and flow on the production line. Utility Model Content

[0003] Purpose of the utility model: This application provides a single battery and a battery pack, which aims to solve the technical problem that the flatness of the bottom of the casing is affected by the explosion-proof valve installed at the bottom of the casing, and thus affects the transfer and flow of the battery on the production line.

[0004] Technical solution: This application provides a single-cell battery with a first orientation, including:

[0005] case,

[0006] A cover plate is connected to one end of the housing along the first direction; the housing has a bottom plate disposed opposite to the cover plate along the first direction, the bottom plate has a first groove on the side away from the cover plate, the first groove has a first bottom wall, the first bottom wall has a second groove and communicates with the first groove; the second groove has a second bottom wall, the second bottom wall has a first through hole extending along the first direction, the first through hole communicates with the second groove;

[0007] A pressure relief component is at least partially disposed within the second groove and connected to the second bottom wall to seal the first through hole;

[0008] A protective layer is disposed in the first groove and connected to the first bottom wall to cover the second groove.

[0009] In some embodiments, the pressure relief component includes:

[0010] The weak point is sealed along the first direction by covering the first through hole;

[0011] A support portion is disposed around the outer periphery of the weak portion and connected to the weak portion; the support portion is disposed within the second groove and connected to the second bottom wall;

[0012] Along the first direction, the weak portion is spaced apart from the protective layer.

[0013] In some embodiments, at least a portion of the weak portion is disposed within the second groove.

[0014] In some embodiments, the weak portion has a fourth groove, which is disposed on the side of the weak portion away from the cover plate.

[0015] In some embodiments, the weak point includes:

[0016] The main body is disposed in the second groove and connected to the bearing part, and the fourth groove is disposed on the side of the main body away from the cover plate;

[0017] A protrusion is connected to the body and protrudes in the first direction away from the cover plate. The side of the body near the cover plate is recessed in the first direction toward the protrusion to form a fifth groove. At least a portion of the protrusion protrudes into the fourth groove.

[0018] The grooves are provided on the side of the body away from the cover plate and surround the protrusion.

[0019] In some embodiments,

[0020] The base plate is further provided with a third groove, which is disposed on the first bottom wall and communicates with the first groove. The third groove has a third bottom wall, and the second groove is disposed on the third bottom wall and communicates with the third groove; the protective layer covers the third groove.

[0021] Wherein, the second bottom wall is used to form at least a portion of the third bottom wall, the third bottom wall is used to form at least a portion of the first bottom wall, and the first bottom wall is used to form at least a portion of the bottom plate.

[0022] In some embodiments,

[0023] The single cell also has a second direction intersecting the first direction;

[0024] The housing has a receiving cavity, the bottom plate is used to surround the receiving cavity, and the receiving cavity communicates with the first through hole;

[0025] The single battery cell also includes a base plate, which is disposed in the receiving cavity and connected to the base plate;

[0026] The base plate has:

[0027] Multiple fourth through holes penetrate the bottom support plate along the first direction;

[0028] Multiple exhaust slots are spaced apart on the side of the base plate near the bottom plate;

[0029] Each of the fourth through holes is connected to one of the exhaust grooves, and the plurality of exhaust grooves are connected to the receiving cavity.

[0030] In some embodiments,

[0031] The single cell also has a third direction that intersects the first direction and the second direction respectively;

[0032] Along the third direction, the exhaust groove, which communicates with the fourth through hole, penetrates at least one side of the bottom support plate and communicates with the receiving cavity.

[0033] In some embodiments,

[0034] The single cell also has a second direction intersecting the first direction;

[0035] The base plate is provided with:

[0036] Multiple first grooves are spaced apart along the second direction;

[0037] A plurality of second grooves, each second groove being disposed on the first bottom wall of a first groove;

[0038] Multiple first through holes, each first through hole penetrating the second bottom wall of a second groove along the first direction;

[0039] Individual cells include:

[0040] Multiple pressure relief components, each of which is disposed in a second groove and connected to the second bottom wall to cover a first through hole;

[0041] The plurality of protective layers are disposed within one of the first grooves and connected to the first bottom wall.

[0042] Accordingly, this application provides a battery pack including the aforementioned single battery cell.

[0043] Beneficial effects: Compared with the prior art, a single battery according to an embodiment of this application has a first direction and includes a shell, a cover plate, a pressure relief component, and a protective layer. The cover plate is connected to one end of the shell along the first direction. The shell has a bottom plate disposed opposite to the cover plate along the first direction. A first groove is provided on the side of the bottom plate away from the cover plate. The first groove has a first bottom wall. The first bottom wall has a second groove and communicates with the first groove. The second groove has a second bottom wall and a first through hole that extends along the first direction and communicates with the second groove. The pressure relief component is at least partially disposed in the second groove and connected to the second bottom wall to cover the first through hole. The protective layer is disposed in the first groove and connected to the first bottom wall to cover the second groove. This application provides a first groove recessed into the base plate along a first direction, and a second groove recessed into the first bottom wall along the first direction. The second groove accommodates the pressure relief component, and the first groove accommodates the protective layer. Therefore, neither the pressure relief component nor the protective layer protrudes from the side of the base plate away from the cover plate. This ensures the flatness of the base plate surface, facilitates the transfer of individual cells on the production line, and ensures the stability of the protective layer's adhesion.

[0044] Compared with the prior art, the battery pack of the present application embodiment includes the above-mentioned single cell, so the battery pack can have all the technical features and beneficial effects of the above-mentioned single cell, which will not be repeated here. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of the first type of single-cell battery according to an embodiment of this application;

[0047] Figure 2 yes Figure 1 A sectional view;

[0048] Figure 3 This is a schematic diagram of the structure of the first type of housing according to an embodiment of this application;

[0049] Figure 4 yes Figure 3 A sectional view;

[0050] Figure 5 yes Figure 4 Enlarged view of section A;

[0051] Figure 6 yes Figure 4 A partial schematic diagram of the pressure relief component connecting the housing in section A;

[0052] Figure 7 yes Figure 4 A partial schematic diagram of the pressure relief components and protective layer connecting the housing in section A;

[0053] Figure 8 yes Figure 7 Enlarged view of section C;

[0054] Figure 9 This is a structural diagram of the weak point of the pressure relief component, including the protrusion.

[0055] Figure 10 yes Figure 9 Enlarged view of section D;

[0056] Figure 11 This is a structural diagram of the base plate;

[0057] Figure 12 yes Figure 2 Enlarged view of section B;

[0058] Figure 13 This is a schematic diagram of the structure of the second type of housing according to an embodiment of this application;

[0059] Figure 14 This is a cross-sectional view of a second type of single-cell battery according to an embodiment of this application;

[0060] Figure 15 yes Figure 14 Enlarged view of section C.

[0061] Explanation of reference numerals in the attached drawings: 1. Cover plate; 2. Shell; 21. Bottom plate; 211. First groove; 212. Second groove; 213. First through hole; 214. Third groove; 215. First bottom wall; 216. Second bottom wall; 217. Third bottom wall; 22. Receiving cavity; 3. Pressure relief component; 31. Weak part; 311. Body; 312. Protrusion; 313. Fifth groove; 314. Score; 32. Bearing part; 33. Fourth groove; 4. Protective layer; 5. Bottom support plate; 51. Second through hole; 52. Third through hole; 53. Fourth through hole; 54. Exhaust groove; Z, First direction; X, Second direction; Y, Third direction. Detailed Implementation

[0062] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0063] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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 on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0064] In related technologies, batteries employ both top-venting and bottom-venting solutions. An increasing number of battery packs are opting for bottom-venting, which enables thermal and electrical separation and improves safety. However, the conventional approach involves creating a through-hole in the bottom plate of the battery casing, with the explosion-proof valve partially embedded within it. This results in the edge of the explosion-proof valve protruding from the bottom plate away from the cover plate, reducing the flatness of the bottom plate and affecting the battery's transfer and flow on the production line.

[0065] In view of this, embodiments of this application provide a single-cell battery designed to solve the above-mentioned problems.

[0066] Please refer to the following: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7This application provides a single-cell battery with a first direction Z (i.e., height direction) and includes a housing 2, a cover plate 1, a pressure relief component 3, and a protective layer 4. The cover plate 1 is connected to one end of the housing 2 along the first direction Z. The housing 2 has a bottom plate 21 disposed opposite to the cover plate 1 along the first direction Z. The bottom plate 21 has a first groove 211 on the side away from the cover plate 1. The first groove 211 has a first bottom wall 215. The first bottom wall 215 has a second groove 212 and communicates with the first groove 211. The second groove 212 has a second bottom wall 216 and a first through hole 213 penetrating along the first direction Z and communicating with the second groove 212. The pressure relief component 3 is at least partially disposed in the second groove 212 and connected to the second bottom wall 216 to cover the first through hole 213. The protective layer 4 is disposed in the first groove 211 and connected to the first bottom wall 215 to cover the second groove 212.

[0067] In this embodiment, by setting a first groove 211 recessed into the bottom plate 21 along the first direction Z and a second groove 212 recessed into the first bottom wall 215 along the first direction Z, the pressure relief component 3 is accommodated by the second groove 212 and the protective layer 4 is accommodated by the first groove 211. Therefore, neither the pressure relief component 3 nor the protective layer 4 protrudes from the side of the bottom plate 21 away from the cover plate 1. This ensures the flatness of the surface of the bottom plate 21, facilitates the transfer of individual cells on the production line, and ensures the stability of the protective layer 4.

[0068] In some embodiments, the pressure relief component 3 and the protective layer 4 can be spaced apart to prevent the protective layer 4 from being directly attached to the pressure relief component 3, thereby preventing the protective layer 4 from affecting the normal opening and pressure relief of the pressure relief component 3.

[0069] Specifically, in this embodiment, the first groove 211 and the second groove 212 are arranged along the first direction Z. The first groove 211 has a first bottom wall 215, and the second groove 212 has a second bottom wall 216. The second groove 212 is disposed on the first bottom wall 215, and the first through hole 213 penetrates the second bottom wall 216. Along the second direction X, the size of the first groove 211 is larger than the size of the second groove 212, and the size of the second groove 212 is larger than the size of the first through hole 213. Thus, a stepped structure is formed on the side of the base plate 21 away from the cover plate 1. The step between each first through hole 213 and the second groove 212 supports and fixes the pressure relief component 3, and the step between the first groove 211 and the second groove 212 supports and fixes the protective layer 4, thereby realizing the fixed connection between the base plate 21 and the pressure relief component 3 and the protective layer 4 respectively. Furthermore, the second groove 212 accommodates the pressure relief component 3, and the first groove 211 accommodates the protective layer 4. This prevents the pressure relief component 3 from protruding outside the base plate 21, and the protective layer 4 also does not protrude outside the base plate 21. In addition, the protective layer 4 can protect the pressure relief component 3 and prevent damage to the pressure relief component 3 caused by direct contact with foreign objects.

[0070] It is understood that the pressure relief component 3 in this embodiment can be an explosion-proof valve, and the protective layer 4 can be an explosion-proof valve protective film. The protective layer 4 is provided with an adhesive backing and is directly attached to the first bottom wall 215. The pressure relief component 3 is preferably welded to the second bottom wall 216, and the weld is ensured to be airtight. The pressure relief component 3 completely covers the first through hole 213, which can ensure the overall sealing performance of the housing 2.

[0071] It should also be noted that the depth of the second groove 212 in this embodiment can be greater than the thickness of the pressure relief member 3, so that the depth of the second groove 212 can be used to directly form the spacing between the pressure relief member 3 and the protective layer 4.

[0072] Please refer to the following: Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the pressure relief component 3 includes a weak portion 31 and a supporting portion 32. The weak portion 31 covers the first through hole 213 along the first direction Z. The supporting portion 32 is disposed around the outer periphery of the weak portion 31 and is connected to the weak portion 31. The supporting portion 32 is disposed in the second groove 212 and is connected to the second bottom wall 216. Along the first direction Z, the weak portion 31 and the protective layer 4 are spaced apart.

[0073] In this embodiment, the supporting portion 32 is thicker than the weak portion 31, and its connection with the second bottom wall 216 ensures the stability of the connection between the pressure relief component 3 and the bottom plate 21. The weak portion 31 covers the first through hole 213, which can burst open to release the thermal runaway gas when the thermal runaway gas pressure inside the housing 2 is high.

[0074] It should be noted that the weak part 31 in this application can completely cover the first through hole 213, thus ensuring that the area of ​​the weak part 31 is large enough to facilitate the smooth bursting of the weak part 31.

[0075] It should also be noted that the weak part 31 and the protective layer 4 are spaced apart along the first direction Z. This can prevent the weak part 31 from sticking to the protective layer 4, thereby preventing the weak part 31 from rupturing abnormally in a non-thermal runaway state, thus ensuring the safety of the single cell.

[0076] It should also be noted that, in the embodiments of this application, the pressure relief component 3 can be slotted on the side of the pressure relief component 3 near the protective layer 4 to form a weak part 31 and a supporting part 32, or it can be slotted on the side of the pressure relief component 3 away from the protective layer 4 to form a weak part 31 and a supporting part 32. In both methods, the weak part 31 and the protective layer 4 are kept at a distance.

[0077] It should also be noted that the relative arrangement mentioned in the embodiments of this application can refer to the two components facing each other in space. Specifically, it can be expressed as follows: the normal directions of the two components can be kept parallel or mirror symmetrical to form an axial alignment relationship.

[0078] Please refer to the following: Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, at least a portion of the weak portion 31 is disposed within the second groove 212.

[0079] In this embodiment, the weak portion 31 can be entirely located within the second groove 212. This prevents the weak portion 31 from protruding into the first groove 211, further preventing contact between the weak portion 31 and the protective layer 4, thereby effectively improving the safety of the battery pack. Alternatively, the weak portion 31 can be partially located within the second groove 212, with a third groove 214 provided between the second groove 212 and the first groove 211. In this case, the other part of the weak portion 31 can be located within the third groove 214, or the other part of the weak portion 31 can be located within the first through hole 213. Both methods achieve the desired spacing between the weak portion 31 and the protective layer 4.

[0080] Please refer to the following: Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the weak portion 31 has a fourth groove 33, which is disposed on the side of the weak portion 31 away from the cover plate 1.

[0081] In this embodiment of the application, by providing a fourth groove 33, the gap between the weak part 31 and the protective layer 4 can be further increased, thereby further preventing the weak part 31 from contacting the protective layer 4.

[0082] In this embodiment, the fourth groove 33 can be milled directly, and the corresponding pressure relief component 3 can be an integral structure. The weak part 31 and the bearing part 32 can be integrally connected, thus ensuring the airtightness of the pressure relief component 3.

[0083] like Figure 9 and Figure 10 As shown, in some embodiments, the weak portion 31 includes a body 311 and a protrusion 312. The body 311 is disposed in the second groove 212 and connected to the support portion 32. The fourth groove 33 is disposed on the side of the body 311 away from the cover plate 1. The protrusion 312 is connected to the body 311 and protrudes in the direction away from the cover plate 1 along the first direction Z. The side of the body 311 near the cover plate 1 is recessed in the protrusion 312 along the first direction Z to form a fifth groove 313. At least a portion of the protrusion 312 protrudes into the fourth groove 33. The fifth groove 313 is disposed on the side of the body 311 near the cover plate 1 and is recessed in the protrusion 312 along the first direction Z. A groove 314 is disposed on the side of the body 311 away from the cover plate 1 and surrounds the protrusion 312.

[0084] In this embodiment, the body 311 of the weak portion 31 is used to connect with the supporting portion 32, and the protrusion 312 of the weak portion 31 is connected to the body 311, thereby providing a space for forming the fifth groove 313. This facilitates the connection between the fifth groove 313 and the receiving cavity 22 of the shell 2, which can increase the gas buffer volume and make it easier for thermal runaway gas to act on the weak portion 31. The gas will then burst open to release pressure after the pressure reaches the bearing limit of the weak portion 31.

[0085] It should be noted that, in this embodiment of the application, although the protrusion 312 protrudes toward the protective layer 4 relative to the body 311, the protrusion 312 is still spaced apart from the protective layer 4, so as to avoid the protective layer 4 affecting the performance of the weak part 31.

[0086] Please refer to the following: Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10In some embodiments, the base plate 21 is further provided with a third groove 214, which is disposed on the first bottom wall 215 and communicates with the first groove 211. The third groove 214 has a third bottom wall 217, and a second groove 212 is disposed on the third bottom wall 217 and communicates with the third groove 214. The protective layer 4 covers the third groove 214. The second bottom wall 216 is used to form at least a portion of the third bottom wall 217, the third bottom wall 217 is used to form at least a portion of the first bottom wall 215, and the first bottom wall 215 is used to form at least a portion of the base plate 21.

[0087] In this embodiment of the application, by providing a third groove 214, a stepped gap can be formed between the second groove 212 and the first groove 211, which can further separate the protective layer 4 and the pressure relief component 3, thereby ensuring the structural stability of the pressure relief component 3 and avoiding interference from external objects that could affect its performance.

[0088] In this embodiment, along the second direction X, the size of the third groove 214 is larger than the size of the second groove 212, and the size of the third groove 214 is smaller than the size of the first groove 211. This forms a step between the second groove 212 and the first groove 211. The pressure relief component 3 is located in the second groove 212, the protective layer 4 is located in the first groove 211, and the third groove 214 is spaced between the protective layer 4 and the pressure relief component 3, forming a physical isolation.

[0089] It is understandable that the protective layer 4 is attached to the first bottom wall 215, and the third groove 214 is disposed on the first bottom wall 215. Therefore, the protective layer 4 can cover the third groove 214. The second groove 212 is disposed on the third bottom wall 217 of the third groove 214. Therefore, the corresponding protective layer 4 can also cover the second groove 212. This can prevent foreign objects from entering the groove and effectively protect the pressure relief component 3 from being damaged by foreign objects.

[0090] It should be noted that the second bottom wall 216 is used to form at least a portion of the third bottom wall 217, the third bottom wall 217 is used to form at least a portion of the first bottom wall 215, and the first bottom wall 215 is used to form at least a portion of the base plate 21. It can be understood that the second bottom wall 216 and the third bottom wall 217 are both part of the first bottom wall 215, and the first bottom wall 215 is part of the base plate 21. The base plate 21 can be an integral structure, thus maintaining structural stability and facilitating integral molding.

[0091] Please refer to the following: Figure 2 , Figure 11 , Figure 12 , Figure 14 and Figure 15In some embodiments, the single battery cell also has a second direction X (i.e., the length direction) intersecting the first direction Z; the housing 2 has a receiving cavity 22, and the bottom plate 21 is used to surround the receiving cavity 22, the receiving cavity 22 is connected to the first through hole 213; the single battery cell also includes a bottom support plate 5, the bottom support plate 5 is disposed in the receiving cavity 22 and connected to the bottom plate 21; the bottom support plate 5 has a plurality of fourth through holes 53 and a plurality of venting grooves 54, the plurality of fourth through holes 53 penetrate the bottom support plate 5 along the first direction Z, and the plurality of venting grooves 54 are spaced apart on the side of the bottom support plate 5 near the bottom plate 21; wherein, each fourth through hole 53 is connected to one venting groove 54, and the plurality of venting grooves 54 are connected to the receiving cavity 22.

[0092] In this embodiment, a base plate 5 is provided in the receiving cavity 22 to support the positioning electrode assembly. At the same time, by providing a fourth through hole 53 and an exhaust groove 54 in the base plate 5, the thermal runaway gas generated by the electrode assembly can pass through the fourth through hole 53 and the exhaust groove 54 to smoothly act on the pressure relief component 3, so as to achieve timely exhaust and pressure relief.

[0093] It should be noted that in this application, the opening of the exhaust groove 54 faces the bottom plate 21, and some of the multiple exhaust grooves 54 can be arranged opposite to the first through hole 213. Correspondingly, the side of the weak area of ​​the pressure relief component 3 away from the protective layer 4 can be connected to the exhaust groove 54 by the first through hole 213, forming a larger gas-carrying space. This facilitates the convergence of thermal runaway gas to the first through hole 213 and its action on the weak part 31, which is beneficial for the weak part 31 to burst open and release pressure in time when the gas pressure in the receiving cavity 22 of the shell 2 is high. The fourth through hole 53 penetrates the bottom support plate 5, enabling the gas on the side of the bottom support plate 5 away from the bottom plate 21 to smoothly pass through the fourth through hole 53 to reach the exhaust groove 54 and finally converge to the first through hole 213.

[0094] like Figure 11 As shown, in some embodiments, the base plate 5 further has a second through hole 51 and a third through hole 52 extending through it along the first direction Z. The third through hole 52 and the second through hole 51 are disposed at both ends of the base plate 5 along the second direction X, and a plurality of fourth through holes 53 are disposed at intervals between the second through hole 51 and the third through hole 52. By providing the second through hole 51 and the third through hole 52, the electrode assembly is positioned when it is installed into the receiving cavity 22, ensuring that the electrode assembly can be placed in a predetermined position. Furthermore, the second through hole 51 and the third through hole 52 each correspond to an exhaust groove 54 and are connected to the exhaust groove 54. In this case, by using the second through hole 51 and the third through hole 52 in conjunction with the exhaust groove 54, some gas can also be guided to the side of the base plate 5 away from the electrode assembly.

[0095] In some embodiments, the single cell also has a third direction Y (i.e., the width direction) intersecting the first direction Z and the second direction X respectively; along the third direction Y, the vent groove 54 communicating with the fourth through hole 53 penetrates at least one side of the bottom support plate 5 and communicates with the receiving cavity 22; along the second direction X, the vent groove 54 communicating with the second through hole 51 penetrates the side of the bottom support plate 5 away from the third through hole 52 and communicates with the receiving cavity 22; along the second direction X, the vent groove 54 communicating with the third through hole 52 penetrates the side of the bottom support plate 5 away from the second through hole 51 and communicates with the receiving cavity 22.

[0096] In this embodiment of the application, by setting this structure, the communication path between each exhaust groove 54 and the receiving cavity 22 can be increased, which is more conducive to the smooth flow of gas inside the single cell and facilitates timely thermal runaway exhaust.

[0097] Please refer to the following: Figure 13 and 14 In some embodiments, the single cell also has a second direction X intersecting the first direction Z; the bottom plate 21 is provided with a plurality of first grooves 211, a plurality of second grooves 212 and a plurality of first through holes 213, the plurality of first grooves 211 are spaced apart along the second direction X, each second groove 212 is disposed in the first bottom wall 215 of a first groove 211, and each first through hole 213 penetrates the second bottom wall 216 of a second groove 212 along the first direction Z; the single cell includes a plurality of pressure relief components 3 and a plurality of protective layers 4, each pressure relief component 3 is disposed in a second groove 212 and connected to the second bottom wall 216 to cover a first through hole 213; each protective layer 4 is disposed in a first groove 211 and connected to the first bottom wall 215.

[0098] In this embodiment of the application, by setting the above structure, multiple pressure relief components 3 can be set at the bottom of the single battery cell to relieve pressure at the same time. This can improve the pressure relief efficiency, reduce the possibility of single battery cell explosion, and thus improve safety.

[0099] Accordingly, this application provides a battery pack including the aforementioned single battery cell.

[0100] It is understood that the battery pack of this application embodiment includes all the technical features and effects of the single battery cells of the foregoing embodiments, and will not be repeated here.

[0101] Of course, the battery pack referred to in this application can be applied to vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among other applications. Vehicles can be new energy vehicles, including pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the aforementioned electrical devices.

[0102] The single-cell battery and battery pack of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0103] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0104] The present application provides a detailed description of a single battery cell and a battery pack, and uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A single cell, characterized by, Having a first direction, comprising: a housing, a cover plate connected to one end of the housing along the first direction; the housing has a bottom plate arranged opposite to the cover plate along the first direction, a first groove is arranged on a side of the bottom plate away from the cover plate, the first groove has a first bottom wall, the first bottom wall is provided with a second groove, and the second groove is in communication with the first groove; the second groove is provided with a second bottom wall, the second bottom wall is provided with a first through hole penetrating along the first direction, and the first through hole is in communication with the second groove; a pressure relief member arranged at least partially in the second groove and connected with the second bottom wall to cover the first through hole; a protective layer arranged in the first groove and connected with the first bottom wall to cover the second groove.

2. The single battery according to claim 1, wherein the pressure relief member comprises: a weak part covering the first through hole along the first direction; a bearing part arranged around an outer circumferential side of the weak part and connected with the weak part; the bearing part is arranged in the second groove and connected with the second bottom wall; the weak part is arranged spaced apart from the protective layer along the first direction.

3. The cell according to claim 2, wherein At least part of the weak part is arranged in the second groove.

4. The cell according to claim 3, wherein The weak part has a fourth groove arranged on a side of the weak part away from the cover plate.

5. The cell according to claim 4, wherein The weak part comprises: a body arranged in the second groove and connected with the bearing part, the fourth groove is arranged on a side of the body away from the cover plate; a protruding part connected with the body and protruding away from the cover plate along the first direction, a side of the body close to the cover plate is recessed toward the protruding part along the first direction to form a fifth groove, and at least part of the protruding part protrudes into the fourth groove; a score arranged on a side of the body away from the cover plate and around the protruding part.

6. The single battery according to claim 1, wherein the bottom plate is further provided with a third groove arranged on the first bottom wall and in communication with the first groove, the third groove has a third bottom wall, the second groove is arranged on the third bottom wall and in communication with the third groove; the protective layer covers the third groove; wherein the second bottom wall is used to form at least part of the third bottom wall, the third bottom wall is used to form at least part of the first bottom wall, and the first bottom wall is used to form at least part of the bottom plate.

7. The single battery according to claim 1, wherein the single battery further has a second direction intersecting the first direction; the housing has a containing cavity, the bottom plate is used to enclose the containing cavity, and the containing cavity is in communication with the first through hole (213); the single battery further comprises a bottom support plate arranged in the containing cavity and connected with the bottom plate; the bottom support plate has: a plurality of fourth through holes penetrating the bottom support plate along the first direction; a plurality of exhaust grooves arranged spaced apart on a side of the bottom support plate close to the bottom plate; Each fourth through hole is in communication with one exhaust groove, and a plurality of exhaust grooves are in communication with the accommodating cavity.

8. The single battery of claim 7, wherein the single battery further has a third direction intersecting the first direction and the second direction. The single battery further has a third direction intersecting the first direction and the second direction. The exhaust groove in communication with the fourth through hole penetrates at least one side of the bottom support plate along the third direction and is in communication with the accommodating cavity.

9. The single battery of claim 1, wherein the single battery further has a second direction intersecting the first direction. The bottom plate is provided with: a plurality of first recesses arranged at intervals along the second direction; a plurality of second recesses, each of which is arranged on the first bottom wall of one first recess; a plurality of first through holes, each of which penetrates the second bottom wall of one second recess along the first direction; The single battery comprises: a plurality of pressure relief members, each of which is arranged in one second recess and connected with the second bottom wall to cover one first through hole; a plurality of protective layers, each of which is arranged in one first recess and connected with the first bottom wall. The single battery of any one of claims 1-9.

10. A battery pack, characterized by, ​

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