Battery monomer and battery pack

Abstract

The utility model provides a battery monomer and a battery pack, and relates to the technical field of batteries. Each single battery comprises a shell, an electrode assembly, an anti-explosion valve and a bottom supporting plate, a first groove is formed in the bottom wall of the shell, and a first through hole is formed in the top of the first groove in a penetrating manner; the electrode assembly is arranged in the shell, the first groove is formed in a sunken mode in the direction close to the electrode assembly, the anti-explosion valve is located in the first groove and connected with the bottom wall to seal and cover the first through hole, the bottom supporting plate is arranged in the shell and abuts against the end, close to the bottom wall, of the electrode assembly, and a second groove is formed in the bottom supporting plate. The second groove is formed in a sunken mode in the direction close to the electrode assembly, the groove top of the first groove is located in the second groove, a second through hole is formed in the groove top of the second groove in a penetrating mode, and the second through hole is communicated with the first through hole. Based on the structural design, the impact resistance of the bottom wall of the shell and the anti-explosion valve is improved, so that the safety of the single battery is improved.

Description

Technical Field

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

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] To mitigate the risks of thermal runaway in individual battery cells, a bottom-mounted explosion-proof valve design is typically employed. This valve is located on the bottom wall of the battery cell's casing, allowing high-temperature, high-pressure gases to escape to the bottom of the vehicle in the event of thermal runaway, thus preventing harm to occupants. However, because the explosion-proof valve is located on the bottom wall of the casing, both the bottom wall and the valve itself have relatively weak impact resistance, potentially compromising the safety of the individual battery cells. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem of how to improve the impact resistance of the bottom wall of the casing and the explosion-proof valve.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] The housing has a bottom wall, on which a first groove is provided, and a through hole is provided on the top of the first groove;

[0008] An electrode assembly is disposed within the housing, and the first groove is recessed toward the electrode assembly;

[0009] An explosion-proof valve is located in the first groove and is connected to the bottom wall to seal the first through hole;

[0010] A bottom support plate is disposed inside the housing. The bottom support plate abuts against the end of the electrode assembly near the bottom wall. A second groove is provided on the bottom support plate. The second groove is recessed towards the electrode assembly. The top of the first groove is located inside the second groove. A second through hole is provided on the top of the second groove. The second through hole communicates with the first through hole.

[0011] In one embodiment of the first aspect, the battery cell further includes an insulating layer located within the housing, the insulating layer covering the electrode assembly, the top of the second groove being connected to the insulating layer and abutting against the top of the first groove, and the second through hole being disposed opposite to the top of the first groove.

[0012] In one embodiment of the first aspect, a first support portion is provided on the side of the base plate facing the electrode assembly. The first support portion protrudes towards the electrode assembly and abuts against the electrode assembly. An exhaust channel is formed between the base plate and the electrode assembly, and the exhaust channel communicates with the second through hole.

[0013] In one embodiment of the first aspect, the battery cell has a first orientation, and the bottom plate is provided with a second support portion and a third support portion on the side near the electrode assembly, the second support portion and the third support portion respectively abutting against the electrode assembly, and the first support portion is located between the second support portion and the third support portion along the first orientation.

[0014] In one embodiment of the first aspect, the battery cell further has a second direction perpendicular to the first direction, and the second support portion and / or the third support portion is a first strip support member, which extends along the second direction.

[0015] In one embodiment of the first aspect, the battery cell further has a second direction perpendicular to the first direction, and multiple first support portions are provided, with the multiple first support portions being arranged opposite to each other along the second direction.

[0016] In one embodiment of the first aspect, the base plate is provided with a plurality of through third holes, the third holes being connected to the exhaust channel, and the first support portion and the third holes are arranged at intervals along the first direction.

[0017] In one embodiment of the first aspect, the base plate is provided with a through first positioning hole and a second positioning hole, the first support portion is a second strip support member, the second strip support member extends along the first direction, and the second strip support member is located between the first positioning hole and the second positioning hole along the first direction.

[0018] In one embodiment of the first aspect, the battery cell further includes a protective layer located on the side of the explosion-proof valve away from the electrode assembly and connected to the bottom wall, the protective layer having through vent holes, and the protective layer being located within the first groove.

[0019] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0020] The beneficial effects of this application are as follows:

[0021] The battery cell provided in this application, by placing the explosion-proof valve in a first groove formed on the bottom wall in the direction close to the electrode assembly, and placing the top of the first groove in a second groove formed on the bottom plate in the direction close to the electrode assembly, can enhance the structural stability and strength of the bottom wall, thereby reducing the possibility of shell deformation and reducing the impact of the external environment on the explosion-proof valve. This improves the impact resistance of the explosion-proof valve and the bottom wall, thus enhancing the safety of the battery cell.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A three-dimensional structural schematic diagram of a battery cell in one embodiment of this application is shown;

[0025] Figure 2 It shows Figure 1 A schematic diagram of the exploded structure of a single battery cell;

[0026] Figure 3 It shows Figure 1 A three-dimensional structural diagram of the hidden electrode assembly in a single battery cell;

[0027] Figure 4 It shows Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0028] Figure 5 It shows Figure 4 A magnified structural diagram of region B in the middle;

[0029] Figure 6 It shows Figure 3 A three-dimensional structural diagram of the middle shell;

[0030] Figure 7 It shows Figure 2 A schematic diagram of the midsole support plate from one perspective;

[0031] Figure 8 It shows Figure 2 Another perspective structural diagram of the midsole support plate;

[0032] Figure 9 A three-dimensional structural schematic diagram of the base plate of a battery cell is shown in another embodiment of this application.

[0033] Explanation of key component symbols:

[0034] 100-Battery cell; 110-Housing shell; 111-Outer peripheral wall; 112-Bottom wall; 113-Receiving cavity; 114-First through hole; 115-First groove; 116-First positioning protrusion; 117-Second positioning protrusion; 120-Cover plate; 130-Terminal post; 140-Electrode assembly; 150-Explosion-proof valve; 160-Insulating layer; 170-Bottom support plate; 171-Second through hole; 172-Second groove; 173-Exhaust channel; 174-Third through hole; 175-Second support part; 176-Third support part; 177-First support part; 178-First positioning hole; 179-Second positioning hole; 181-First strip support member; 182-Second strip support member; 183-Columnar support member; 190-Protective layer; 191-Ventilation hole; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0036] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0039] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0041] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0042] Battery cells are a crucial component of power battery packs. To mitigate the risks of thermal runaway in individual cells, a bottom-mounted explosion-proof valve design is typically employed. This means the explosion-proof valve is located on the bottom wall of the battery cell's casing, facing the ground, to facilitate the evacuation of high-temperature, high-pressure gases from the casing to the bottom of the vehicle in the event of thermal runaway, thus preventing harm to occupants. However, because the explosion-proof valve is located on the bottom wall of the casing, both the bottom wall and the valve itself have relatively weak impact resistance, potentially compromising the safety of the battery cell.

[0043] like Figure 1 and Figure 2 As shown, in order to solve the above-mentioned technical problems, the embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be used in electrical devices or energy storage devices in the form of battery packs.

[0044] Of course, the battery cell 100 can also be used directly in electrical devices or energy storage devices without taking the form of a battery pack. No specific restrictions are placed on the application scenarios of the battery cell 100 here.

[0045] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, and new energy vehicles, with new energy vehicles including pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles; spacecraft can be airplanes, rockets, space shuttles, drones, 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 can be 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; energy storage devices include energy storage containers and energy storage power stations; no specific restrictions are placed on the types of electrical devices and energy storage devices here.

[0046] Combination Figures 3 to 7 As shown, the battery cell 100 provided in this embodiment includes: a housing 110, a cover plate 120, a terminal post 130, an electrode assembly 140, an explosion-proof valve 150, and a bottom support plate 170.

[0047] The housing 110 has a bottom wall 112, on which a first groove 115 is provided, and a through hole 114 is provided on the top of the groove 115; a cover plate 120 is connected to the housing 110, and the cover plate 120 and the bottom wall 112 are arranged opposite to each other, and an electrode post 130 passes through the cover plate 120; an electrode assembly 140 is disposed in the housing 110 and electrically connected to the electrode post 130, and the first groove 115 is recessed towards the electrode assembly 140; an explosion-proof valve 150 is located in the first groove 115. It is connected to the bottom wall 112 to cover the first through hole 114; the bottom support plate 170 is disposed in the housing 110, and the bottom support plate 170 abuts against the end of the electrode assembly 140 near the bottom wall 112. The bottom support plate 170 is provided with a second groove 172, which is recessed towards the electrode assembly 140. The top of the first groove 115 is located in the second groove 172. A through second through hole 171 is provided on the top of the second groove 172, and the second through hole 171 communicates with the first through hole 114.

[0048] It should be noted that, in the description of this application, "groove top" can be understood as: the side of the groove near the electrode assembly 140. For example, the groove top of the first groove 115 refers to the side of the first groove 115 near the electrode assembly 140, and the groove top of the second groove 172 refers to the side of the second groove 172 near the electrode assembly 140.

[0049] It is understood that the battery cell 100 provided in this embodiment, by placing the explosion-proof valve 150 in a first groove 115 formed by recessing the bottom wall 112 in the direction close to the electrode assembly 140, and placing the top of the first groove 115 in a second groove 172 formed by recessing the bottom support plate 170 in the direction close to the electrode assembly 140, can enhance the structural stability and structural strength of the bottom wall 112, thereby reducing the possibility of deformation of the housing 110, and reducing the impact of the external environment on the explosion-proof valve 150, thereby improving the impact resistance of the explosion-proof valve 150 and the bottom wall 112, and thus improving the safety of the battery cell 100.

[0050] In addition, when the battery cell 100 experiences thermal runaway, the base plate 170 will melt due to heat. At this time, the high-temperature and high-pressure gas inside the casing 110 can flow through the second through hole 171 and the first through hole 114 in sequence, causing the explosion-proof valve 150 to open, thereby achieving pressure relief.

[0051] like Figure 2 and Figure 3 As shown, by way of example, the housing 110 also has an outer peripheral wall 111 connected to the bottom wall 112 and disposed around the electrode assembly 140. The outer peripheral wall 111 and the bottom wall 112 enclose a receiving cavity 113 for accommodating the electrode assembly 140 and the bottom support plate 170. The cover plate 120 is connected to the outer peripheral wall 111 to cover the receiving cavity 113.

[0052] like Figure 2 and Figure 7 As shown, in one embodiment, the battery cell 100 further includes an insulating layer 160 located within the housing 110. The insulating layer 160 wraps around the electrode assembly 140, thereby insulating the electrode assembly 140 from the housing 110 and reducing the risk of short circuit. Meanwhile, the top of the second groove 172 is connected to the insulating layer 160 and abuts against the top of the first groove 115. The second through hole 171 and the top of the first groove 115 are opposite to each other. This allows the bottom wall 112, the bottom support plate 170, and the electrode assembly 140 to form a stable structure, thereby enhancing the stability of the battery cell 100.

[0053] It should be noted that "the tops of the second through hole 171 and the first groove 115 are arranged opposite to each other" can be understood as: the orthogonal projection of the hole wall of the second through hole 171 along the direction from the electrode assembly 140 to the explosion-proof valve 150 is located at the top of the first groove 115.

[0054] For example, the material of the insulating layer 160 is one of polypropylene (PP), polyethylene (PE), polyester (PET) and ceramic coating, and no specific limitation is made on the material of the insulating layer 160.

[0055] like Figures 2 to 4 As shown, the bottom plate 170 is further provided with a first support portion 177 on the side facing the electrode assembly 140. The first support portion 177 protrudes in the direction close to the electrode assembly 140 and abuts against the electrode assembly 140. An exhaust channel 173 is formed between the bottom plate 170 and the electrode assembly 140. The exhaust channel 173 is connected to the second through hole 171.

[0056] It should be noted that the first support portion 177 protrudes towards the electrode assembly 140, the first groove 115 is recessed towards the electrode assembly 140, and the second groove 172 is recessed towards the electrode assembly 140. That is, the protruding direction of the first support portion 177, the recessing direction of the first groove 115, and the recessing direction of the second groove 172 are the same.

[0057] It is understood that the first support portion 177, formed by the protrusion of the base plate 170 towards the electrode assembly 140, abuts against the electrode assembly 140, thereby supporting the electrode assembly 140. This forms an exhaust channel 173 between the base plate 170 and the electrode assembly 140, which communicates with the second through hole 171. In this way, when the battery cell 100 experiences thermal runaway, high-temperature and high-pressure gas can enter the second through hole 171 through the exhaust channel 173 and then reach the first through hole 114, causing the explosion-proof valve 150 to open and exhaust gas.

[0058] like Figure 1 and Figure 2 As shown, the battery cell 100 further has a first direction X, and the bottom plate 170 is provided with a second support portion 175 and a third support portion 176 on the side near the electrode assembly 140. The second support portion 175 and the third support portion 176 respectively abut against the electrode assembly 140, and the first support portion 177 is located between the second support portion 175 and the third support portion 176 along the first direction X.

[0059] It is understood that the second support portion 175 and the third support portion 176 can support both ends of the electrode assembly 140 along the first direction X, thereby enhancing the stability of the electrode assembly 140 within the housing 110.

[0060] like Figure 1 , Figure 2 and Figure 8 As shown, the battery cell 100 further has a second direction Y perpendicular to the first direction X, and the second support portion 175 and / or the third support portion 176 are first strip support members 181, which extend along the second direction Y.

[0061] It should be noted that "the second support part 175 and / or the third support part 176 is the first strip support member 181" can be understood as: the second support part 175 is the first strip support member 181, or the third support part 176 is the first strip support member 181, or both the second support part 175 and the third support part 176 are the first strip support member 181.

[0062] Understandably, since the first strip support 181 was selected as the second support 175 and the third support 176, the first strip support 181 is extended along the second direction Y, that is, the length direction of the first strip support 181 is parallel to the second direction Y. In this way, the bottom plate 170 can support the electrode assembly 140 more stably, so as to further increase the stability of the electrode assembly 140 within the housing 110.

[0063] Of course, in the above embodiments, the second support portion 175 and / or the third support portion 176 can also be... Figure 8 The cylindrical support 183 shown can also support the electrode assembly 140. No specific restrictions are made on the shape of the second support 175 and / or the third support 176.

[0064] like Figure 1 and Figure 2 As shown, the battery cell 100 further has a second direction Y perpendicular to the first direction X, and multiple first support portions 177 are provided, with the multiple first support portions 177 being arranged opposite each other along the second direction Y.

[0065] It is understandable that since the base plate 170 is provided with a plurality of first support portions 177 along the second direction Y, and the plurality of first support portions 177 are arranged opposite to each other along the second direction Y, that is, every two adjacent first support portions 177 are arranged opposite to each other in the second direction Y, the base plate 170 can more stably support the electrode assembly 140, so as to further increase the stability of the electrode assembly 140 within the housing 110.

[0066] Of course, in the above embodiment, a plurality of first support portions 177 are further provided on the base plate 170 along the first direction X. The plurality of first support portions 177 are arranged opposite to each other along the first direction X. In this way, the plurality of first support portions 177 are arranged in an array on the base plate 170 along the first direction X and the second direction Y, so that the base plate 170 provides multiple supports for the electrode assembly 140.

[0067] like Figure 1 and Figure 2 As shown, the bottom support plate 170 is further provided with a plurality of through third holes 174, which are connected to the exhaust channel 173. The first support part 177 and the third holes 174 are arranged at intervals along the first direction X.

[0068] It is understandable that by setting the third through hole 174, the possibility of high temperature and high pressure gas remaining between the bottom plate 170 and the bottom wall 112 can be reduced. In other words, the high temperature and high pressure gas remaining between the bottom plate 170 and the bottom wall 112 can pass through the bottom plate 170 to reach the exhaust channel 173, and then be discharged from the battery cell 100 as the explosion-proof valve 150 is opened.

[0069] like Figure 1 , Figure 2 , Figure 4 and Figure 9 As shown, the base plate 170 is further provided with a through first positioning hole 178 and a second positioning hole 179, the first support part 177 is a second strip support member 182, the second strip support member 182 extends along the first direction X, and the second strip support member 182 is located between the first positioning hole 178 and the second positioning hole 179 along the first direction X.

[0070] To prevent the electrode assembly 140 from blocking the second through hole 171, the height of the second strip support 182 along the third direction Z can also be set to be lower than the height of the second groove 172 along the third direction Z.

[0071] Understandably, the first positioning hole 178 is used to pass through the first positioning protrusion 116 on the bottom wall 112, and the second positioning hole 179 is used to pass through the second positioning protrusion 117 on the bottom wall 112, thereby restricting the movement of the bottom support plate 170 relative to the bottom wall 112. Simultaneously, the second strip support member 182 is selected as the first support part 177. The second strip support member 182 extends along the first direction X, that is, the length direction of the second strip support member 182 is parallel to the first direction X, thus enabling the bottom support plate 170 to more stably support the electrode assembly 140. This improves the stability of the battery cell 100.

[0072] Of course, in the above embodiments, the first support portion 177 can also be Figure 8 The cylindrical support 183 shown extends along a third direction Z that is perpendicular to the first direction X and the second direction Y (i.e., the first direction X, the second direction Y and the third direction Z are mutually perpendicular). That is, the axial direction of the cylindrical support 183 is parallel to the third direction Z, and it can also provide support for the electrode assembly 140. Here, the type of the first support part 177 is not specifically limited.

[0073] like Figure 2 and Figure 9 As shown, in one embodiment, the battery cell 100 further includes a protective layer 190, which is located on the side of the explosion-proof valve 150 away from the electrode assembly 140 and connected to the bottom wall 112. The protective layer 190 is provided with a through vent hole 191 and is located in the first groove 115.

[0074] For example, the protective layer 190 may be an aluminum foil, a copper foil layer, a polymer film, etc., without any specific limitation.

[0075] It is understandable that by setting the protective layer 190, the explosion-proof valve 150 can be protected, thereby reducing the adverse effects of the external environment on the explosion-proof valve 150. In addition, since the protective layer 190 is located in the first groove 115, the adverse effects of the external environment on the protective layer 190 can also be reduced, so that the protective layer 190 can better protect the explosion-proof valve 150.

[0076] Furthermore, through the vent 191, when the explosion-proof valve 150 is opened, high-temperature and high-pressure gas can be discharged from the battery cell 100 through the vent 191, or the battery cell may rupture under the impact of high-temperature and high-pressure gas, thereby releasing a large amount of gas.

[0077] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.

[0078] It is understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing (110) has a bottom wall (112) and a first groove (115) is provided on the bottom wall (112). A first through hole (114) is provided on the top of the groove (115). An electrode assembly (140) is disposed within the housing (110), and the first groove (115) is recessed toward the electrode assembly (140); An explosion-proof valve (150) is located in the first groove (115) and is connected to the top of the first groove (115) to cover the first through hole (114). A bottom support plate (170) is disposed inside the housing (110). The bottom support plate (170) abuts against the end of the electrode assembly (140) near the bottom wall (112). A second groove (172) is provided on the bottom support plate (170). The second groove (172) is recessed towards the electrode assembly (140). The top of the first groove (115) is located inside the second groove (172). A second through hole (171) is provided on the top of the second groove (172). The second through hole (171) communicates with the first through hole (114).

2. The battery cell according to claim 1, characterized in that, The battery cell also includes an insulating layer (160) located inside the housing (110), the insulating layer (160) wrapping around the electrode assembly (140), the top of the second groove (172) being connected to the insulating layer (160) and abutting against the top of the first groove (115), and the second through hole (171) and the top of the first groove (115) being disposed opposite to each other.

3. The battery cell according to claim 2, characterized in that, The base plate (170) has a first support portion (177) on the side facing the electrode assembly (140). The first support portion (177) protrudes towards the electrode assembly (140) and abuts against the electrode assembly (140). An exhaust channel (173) is formed between the base plate (170) and the electrode assembly (140), and the exhaust channel (173) communicates with the second through hole (171).

4. The battery cell according to claim 3, characterized in that, The battery cell has a first direction (X). The bottom plate (170) is provided with a second support portion (175) and a third support portion (176) on the side near the electrode assembly (140). The second support portion (175) and the third support portion (176) respectively abut against the electrode assembly (140). The first support portion (177) is located between the second support portion (175) and the third support portion (176) along the first direction (X).

5. The battery cell according to claim 4, characterized in that, The battery cell also has a second direction (Y) perpendicular to the first direction (X), and the second support portion (175) and / or the third support portion (176) are first strip support members (181), which extend along the second direction (Y).

6. The battery cell according to claim 4, characterized in that, The battery cell also has a second direction (Y) perpendicular to the first direction (X), and multiple first support portions (177) are provided, with the multiple first support portions (177) being arranged opposite to each other along the second direction (Y).

7. The battery cell according to claim 6, characterized in that, The base plate (170) is provided with a plurality of through third holes (174), which are connected to the exhaust channel (173). The first support part (177) and the third holes (174) are arranged at intervals along the first direction (X).

8. The battery cell according to claim 4, characterized in that, The base plate (170) is provided with a through first positioning hole (178) and a second positioning hole (179). The first support part (177) is a second strip support member (182). The second strip support member (182) extends along the first direction (X) and is located between the first positioning hole (178) and the second positioning hole (179) along the first direction (X).

9. The battery cell according to any one of claims 1 to 8, characterized in that, The battery cell also includes a protective layer (190), which is located on the side of the explosion-proof valve (150) away from the electrode assembly (140) and connected to the bottom wall (112). The protective layer (190) is provided with a through vent hole (191) and is located in the first groove (115).

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 9.

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