Battery cell and battery pack

Abstract

This invention discloses a battery cell and a battery pack. The battery cell includes a housing and an electrode assembly. The housing has a receiving cavity and includes a bottom plate and a stepped portion. The stepped portion is connected to the bottom plate. A first groove is provided on the side of the bottom plate away from the receiving cavity. The first groove extends towards the receiving cavity to form the stepped portion on the inner side of the bottom plate. The electrode assembly is disposed in the receiving cavity. On the one hand, the stepped portion can enhance the structural strength of the bottom plate to improve its resistance to deformation. On the other hand, when the battery cell is impacted from the bottom, the first groove can provide the battery cell with a clearance space to reduce the impact force being directly transmitted to the electrode assembly, thereby reducing the risk of fire and explosion of the battery pack.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, the safety requirements for power battery packs are becoming increasingly stringent. Because new energy vehicles are prone to scraping and impacting power battery packs during operation, severe damage to the battery pack can lead to fire and explosion, thus reducing the safety of the battery pack. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a single battery cell that can reduce the risk of battery pack fire and explosion.

[0004] The present invention also proposes a battery pack having the above-mentioned battery cells.

[0005] A battery cell according to a first aspect of the present invention comprises: The housing has a receiving cavity. The housing includes a bottom plate and a stepped portion. The stepped portion is connected to the bottom plate. The bottom plate has a first groove on the side opposite to the receiving cavity. The first groove extends toward the receiving cavity to form the stepped portion on the inner side of the bottom plate. The electrode assembly is disposed within the receiving cavity.

[0006] The battery cell according to the first aspect of the present invention has at least the following beneficial effects: By setting the first groove and the step, when the bottom of the new energy vehicle is scratched or hit, the first groove can provide space for the battery cell to avoid impact, so as to reduce the impact force directly transmitted to the electrode assembly, and the step can enhance the structural strength of the bottom plate to improve the deformation resistance of the bottom plate, thereby reducing the risk of battery pack fire and explosion.

[0007] According to some embodiments of the present invention, the battery cell further includes a bracket disposed within the receiving cavity and connected to the base plate, the bracket having a second groove on the side facing the base plate, and the stepped portion being accommodated within the second groove.

[0008] According to some embodiments of the present invention, the bracket includes a protrusion disposed on the side of the bracket away from the base plate, and the electrode assembly is provided with a clearance groove, in which the protrusion is received.

[0009] According to some embodiments of the present invention, the electrode assembly includes a bare battery cell and an annular insulating member. The annular insulating member is hollow to form an isolation cavity. The bare battery cell is housed in the isolation cavity. The bare battery cell has a first default portion, and the annular insulating member has a second default portion. The first default portion and the second default portion communicate to form the clearance groove.

[0010] According to some embodiments of the present invention, the bracket includes a first connecting plate, a crossover plate, and a second connecting plate, the crossover plate being connected between the first connecting plate and the second connecting plate, the first connecting plate, the crossover plate, and the second connecting plate forming a second groove, and the first connecting plate and the second connecting plate being located on both sides of the step portion.

[0011] According to some embodiments of the present invention, the first connecting plate is provided with a first through hole, and / or the second connecting plate is provided with a second through hole.

[0012] According to some embodiments of the present invention, the side of the spanning plate facing the first connecting plate is provided with a third through hole communicating with the second groove, and / or, the side of the spanning plate facing the second connecting plate is provided with a fourth through hole communicating with the second groove.

[0013] According to some embodiments of the present invention, the side of the electrode assembly facing the base plate is a first planar structure, and the side of the bracket away from the base plate is a second planar structure, wherein the first planar structure is connected to the second planar structure.

[0014] According to some embodiments of the present invention, the battery cell further includes an explosion-proof valve, the groove wall of the first groove has a pressure relief port communicating with the receiving cavity, and the explosion-proof valve is connected to the bottom plate and covers the pressure relief port.

[0015] According to some embodiments of the present invention, the battery cell further includes a buffer member, the buffer member having a clearance hole, at least a portion of the buffer member being accommodated in the first groove, and along the axial direction of the clearance hole, the projection of the explosion-proof valve on the base plate is located within the projection of the hole wall of the clearance hole on the base plate.

[0016] According to some embodiments of the present invention, the battery cell further includes a bracket, the bracket being disposed within the receiving cavity and connected to the base plate, the bracket being disposed opposite to the base plate, and the bracket having a fifth through hole on the side facing the base plate. Along the direction from the bracket to the base plate, the projection of the hole wall of the fifth through hole on the base plate is offset from that of the explosion-proof valve.

[0017] According to some embodiments of the present invention, the housing further includes a first side plate and a second side plate, and the bottom plate is connected between the first side plate and the second side plate. The first side plate and the second side plate are disposed opposite to each other. The first side plate is provided with a first opening, and the second side plate is provided with a second opening. Both the first opening and the second opening communicate with the first groove.

[0018] A battery pack according to a second aspect of the present invention includes: Box; The battery cells described in the above embodiments are housed within the casing.

[0019] The battery pack according to the second aspect of the present invention has at least the following beneficial effects: In the battery cell of the first aspect embodiment of the present invention, the bottom plate is close to the bottom of the box. When the bottom of the box is scratched or impacted, the bottom plate is provided with a first groove on the outer side. The first groove can provide a clearance space for the battery cell. The clearance space can avoid the deformation caused by the scratching or impact of the box, so as to reduce the impact force directly transmitted to the electrode assembly. In addition, the stepped part can enhance the structural strength of the bottom plate, so as to improve the deformation resistance of the bottom plate, thereby reducing the risk of fire and explosion of the battery pack.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present invention; Figure 2 This is an exploded view of a battery cell according to an embodiment of the present invention; Figure 3 This is a front view of a battery cell according to an embodiment of the present invention; Figure 4 for Figure 3 Sectional view of line AA in the middle; Figure 5 This is a schematic diagram of the structure of a bracket according to an embodiment of the present invention; Figure 6 This is a schematic diagram of another embodiment of the bracket according to one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present invention, with the buffer component hidden in the diagram.

[0022] Icon labels: The shell 100, the receiving cavity 101, the pressure relief port 102, the bottom plate 110, the first groove 111, the step portion 112, the first side plate 120, the first opening 121, the second side plate 130, and the second opening 131; Bracket 200, second groove 201, protrusion 202, first planar structure 203, first connecting plate 210, first through hole 211, crossover plate 220, third through hole 221, fourth through hole 222, fifth through hole 223, second connecting plate 230, second through hole 231; Electrode assembly 300, clearance groove 301, bare cell 310, annular insulating component 320, isolation cavity 321; Explosion-proof valve 510, buffer component 520, clearance hole 521. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these 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 the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0025] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0026] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0027] In related technologies, with the rapid development of new energy vehicles, the safety performance requirements for power battery packs are also becoming increasingly stringent. Because new energy vehicles are prone to scratches and impacts to the power battery pack during operation, severe damage to the battery pack can lead to fire and explosion, thus reducing the safety of the battery pack.

[0028] Reference Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present invention. Figure 2 This is an exploded view of a single battery cell according to an embodiment of the present invention. Figure 3 This is a front view of a battery cell according to an embodiment of the present invention. Figure 4 for Figure 3 A cross-sectional view along line AA. As shown in the figure, the battery cell of the first aspect embodiment of the present invention includes a housing 100 and an electrode assembly 300. The housing 100 has a receiving cavity 101. The housing 100 includes a bottom plate 110 and a stepped portion 112. The stepped portion 112 is connected to the bottom plate 110. The bottom plate 110 has a first groove 111 on the side away from the receiving cavity 101. The first groove 111 extends toward the receiving cavity to form the stepped portion 112 on the inner side of the bottom plate 110. The electrode assembly 300 is disposed in the receiving cavity 101. On the one hand, the stepped portion 112 can enhance the structural strength of the bottom plate 110 to improve the deformation resistance of the bottom plate 110. On the other hand, when the battery cell is impacted from the bottom, the first groove 111 can provide a clearance space for the battery cell to reduce the impact force from being directly transmitted to the electrode assembly 300, thereby reducing the risk of the battery pack catching fire and exploding.

[0029] For example, the battery pack includes a housing and individual battery cells housed within the housing. The bottom plate 110 is located near the bottom of the housing. When the bottom of the housing is scratched or impacted, the bottom plate 110 has a first groove 111 on its outer side. The first groove 111 provides clearance space for the individual battery cells. This clearance space can prevent deformation caused by the scratching or impact on the housing, thereby reducing the direct transmission of impact force to the electrode assembly 300. Furthermore, the stepped portion 112 can enhance the structural strength of the bottom plate 110, thereby improving the deformation resistance of the bottom plate 110 and reducing the risk of fire and explosion of the battery pack.

[0030] Reference Figure 5 , Figure 5 This is a schematic diagram of the structure of the bracket 200 according to an embodiment of the present invention. In this embodiment, the battery cell also includes a bracket 200, which is disposed in the receiving cavity 101 and connected to the base plate 110. The bracket 200 has a second groove 201 on the side facing the base plate 110, and the stepped portion 112 is accommodated in the second groove 201. On the one hand, it can position the relative position of the base plate 110 and the bracket 200 to facilitate the installation and positioning of the bracket 200. On the other hand, the bracket 200 can isolate the electrode assembly 300 from the housing 100, preventing the electrode assembly 300 from contacting the housing 100 after shedding powder and causing corrosion of the housing 100, thereby improving the safety of the battery pack.

[0031] For example, the second groove 201 is located on the lower side of the bracket 200, and the lower side of the bracket 200 is connected to the base plate 110. The upper side of the bracket 200 is a planar structure, and the upper side of the bracket 200 is connected to the electrode assembly 300. The step portion 112 is accommodated in the second groove 201 and abuts against the side wall of the second groove 201. On the one hand, it can position the relative position of the top and the bracket 200 to facilitate the installation of the positioning bracket 200. On the other hand, the bracket 200 can isolate the electrode assembly 300 from the housing 100, preventing the electrode assembly 300 from contacting the housing 100 after shedding powder, which would cause the housing 100 to be corroded, thereby improving the safety of the battery pack.

[0032] For example Figure 5 As shown, in this embodiment, the support 200 includes a protrusion 202, which is located on the side of the support 200 away from the base plate 110. The electrode assembly 300 is provided with a relief groove 301, and the protrusion 202 is accommodated in the relief groove 301. On the one hand, it can position the relative position of the electrode assembly 300 and the support 200 to facilitate the installation and positioning of the electrode assembly 300. On the other hand, the support 200 forms a third groove on both sides of the protrusion 202, and the portions of the electrode assembly 300 located on both sides of the relief groove 301 are respectively accommodated in the corresponding third groove, thereby increasing the energy density of the electrode assembly 300.

[0033] For example, the clearance groove 301 extends through the opposite sides of the electrode assembly 300 along the thickness direction of the electrode assembly 300. The support 200 has a first direction perpendicular to the thickness direction of the electrode assembly 300. The protrusion 202 is provided on the upper side of the support 200. Along the first direction, the support 200 forms a third groove on the opposite sides of the protrusion 202. The portions of the electrode assembly 300 located on both sides of the clearance groove 301 are respectively accommodated in the corresponding third groove, thereby increasing the energy density of the electrode assembly 300.

[0034] It should be noted that the shape of the protrusion 202 matches the shape of the relief groove 301. The protrusion 202 is accommodated in the relief groove 301 and can abut against the side wall of the relief groove 301, which can position the relative position of the electrode assembly 300 and the bracket 200, so as to facilitate the installation of the positioning electrode assembly 300.

[0035] It is understandable that the protrusion 202 can increase the structural strength of the bracket 200, thereby improving the bracket 200's resistance to deformation, thus reducing the risk of the electrode assembly 300 being damaged when the new energy vehicle encounters scraping or impact, and improving the safety of the battery pack. No restrictions are imposed here.

[0036] For example Figure 2As shown, in this embodiment, the electrode assembly 300 includes a bare battery cell 310 and an annular insulating member 320. The annular insulating member 320 is hollow to form an isolation cavity 321. The bare battery cell 310 is housed in the isolation cavity 321. The bare battery cell 310 has a first default portion, and the annular insulating member 320 has a second default portion. The first default portion and the second default portion are connected to form a clearance groove 301. On the one hand, the annular insulating member 320 can prevent the bare battery cell 310 from contacting the housing 100. On the other hand, it can facilitate the forming of the clearance groove 301 on the electrode assembly 300.

[0037] For example, after the annular insulating member 320 encloses the bare cell 310, a clearance groove 301 can be cut on the electrode assembly 300 using a laser cutting device, so that a first default portion is formed on the bare cell 310 and a second default portion is formed on the annular insulating member 320. This eliminates the need to cut the bare cell 310 and the annular insulating member 320 separately, making it easier to form the clearance groove 301 on the electrode assembly 300.

[0038] It should be noted that the bare cell 310 can be a laminated cell or a wound cell, and there are no restrictions here.

[0039] Reference Figure 6 , Figure 6 This is a schematic diagram of another embodiment of the bracket 200 according to one embodiment of the present invention. As shown in the figure, in this embodiment, the bracket 200 includes a first connecting plate 210, a crossover plate 220, and a second connecting plate 230. The crossover plate 220 is connected between the first connecting plate 210 and the second connecting plate 230. The first connecting plate 210, the crossover plate 220, and the second connecting plate 230 form a second groove 201. The first connecting plate 210 and the second connecting plate 230 are respectively located on both sides of the stepped portion 112, which can improve the connection strength between the bracket 200 and the base plate 110, thereby improving the deformation resistance of the battery cell.

[0040] For example, the side of the first connecting plate 210 facing the second connecting plate 230 is connected to one side of the crossing plate 220, and the side of the second connecting plate 230 facing the first connecting plate 210 is connected to the other side of the crossing plate 220. The first connecting plate 210 and the second connecting plate 230 are respectively connected to the upper side of the base plate 110. The step portion 112 is accommodated in the second groove 201, which can improve the connection strength between the bracket 200 and the base plate 110, thereby improving the deformation resistance of the battery cell.

[0041] It should be noted that the first connecting plate 210, the cross plate 220 and the second connecting plate 230 are an integrated structure, which can reduce the number of molds, thereby reducing the production cost of the molds and thus reducing the production cost of the battery cells. No restrictions are imposed here.

[0042] For example Figure 5 , Figure 6 As shown, in this embodiment, the first connecting plate 210 is provided with a first through hole 211. The first through hole 211 penetrates the first connecting plate 210 along the thickness direction. The first through hole 211 can store electrolyte, which is beneficial for the electrolyte to wet the electrode assembly 300, thereby inhibiting lithium plating of the electrode assembly 300.

[0043] In this embodiment, the second connecting plate 230 is provided with a second through hole 231. The second through hole 231 penetrates the second connecting plate 230 along the thickness direction of the second connecting plate 230. The second through hole 231 can store electrolyte, which is beneficial for the electrolyte to wet the electrode assembly 300, thereby inhibiting lithium plating of the electrode assembly 300.

[0044] For example Figure 6 As shown, in this embodiment, the side of the electrode assembly 300 facing the base plate 110 is a first planar structure 203, and the side of the bracket 200 away from the base plate 110 is a second planar structure. The first planar structure 203 is connected to the second planar structure. On the one hand, this can increase the contact area between the electrode assembly 300 and the bracket 200, thereby avoiding stress concentration. On the other hand, it is beneficial for the heat generated by the electrode assembly 300 during operation to be transferred to the housing 100 through the bracket 200, thereby improving the thermal management performance of the battery cell.

[0045] For example Figure 1 , Figure 3 As shown, in this embodiment, the battery cell also includes an explosion-proof valve 510. The groove wall of the first groove 111 has a pressure relief port 102 that communicates with the receiving cavity 101. The explosion-proof valve 510 is connected to the base plate 110 and covers the pressure relief port 102. The explosion-proof valve 510 can release pressure in time when the internal pressure of the battery cell rises abnormally, which can prevent the casing 100 from bursting, thereby improving the safety of the battery cell.

[0046] For example, when the internal pressure of a battery cell rises abnormally, the explosion-proof valve 510 opens the pressure relief port 102, allowing the gas inside the battery cell to be discharged from the pressure relief port 102, which can prevent the casing 100 from bursting, thereby improving the safety of the battery cell.

[0047] In this embodiment, the battery cell also includes a buffer 520. The buffer 520 is provided with a clearance hole 521. At least a portion of the buffer 520 is accommodated in the first groove 111. Along the axial direction of the clearance hole 521, the projection of the explosion-proof valve 510 on the base plate 110 is located within the projection of the hole wall of the clearance hole 521 on the base plate 110. On the one hand, when the new energy vehicle is scratched or hit, the buffer 520 can absorb the impact force to reduce the impact on the explosion-proof valve 510. On the other hand, the clearance space provides clearance space for the explosion-proof valve 510 to prevent the buffer 520 from affecting the normal opening or closing of the explosion-proof valve 510.

[0048] For example, the buffer pad is installed in the first groove 111 by adhesive or snap-fit, the clearance hole 521 avoids the explosion-proof valve 510, and the buffer 520 is made of elastic material such as rubber. When the new energy vehicle is scratched or hit, the buffer 520 can absorb the impact force to reduce the impact on the explosion-proof valve 510.

[0049] For example Figure 6 As shown, in this embodiment, the cross plate 220 is provided with a third through hole 221 that connects to the second groove 201 on the side facing the first connecting plate 210. The pressure relief port 102 connects to the second groove 201, which is conducive to the directional transmission of gas inside the battery to the explosion-proof valve 510, so as to prevent the accumulation of gas inside the battery and improve the safety of the battery cell.

[0050] For example, the third through hole 221 extends through the cross plate 220 along the direction from the first connecting plate 210 to the second connecting plate 230, which facilitates the directional transfer of gas inside the battery to the explosion-proof valve 510, thereby preventing internal pressure buildup in the battery and improving the safety of the battery cell.

[0051] In this embodiment, the cross plate 220 is provided with a fourth through hole 222 on the side facing the second connecting plate 230, which communicates with the second groove 201. The pressure relief port 102 communicates with the second groove 201, which is conducive to the directional transmission of gas inside the battery to the explosion-proof valve 510, so as to prevent the accumulation of gas inside the battery and improve the safety of the battery cell.

[0052] For example, the fourth through hole 222 passes through the cross plate 220 along the direction from the first connecting plate 210 to the second connecting plate 230, which is conducive to the directional transfer of gas inside the battery to the explosion-proof valve 510, so as to prevent the accumulation of gas inside the battery and improve the safety of the battery cell.

[0053] For example Figure 5 As shown, in this embodiment, the battery cell also includes a bracket 200. The bracket 200 is disposed in the receiving cavity 101 and connected to the base plate 110. The bracket 200 and the base plate 110 are arranged opposite to each other. The bracket 200 has a fifth through hole 223 on the side facing the base plate 110. Along the direction from the bracket 200 to the base plate 110, the projection of the hole wall of the fifth through hole 223 on the base plate 110 is offset from the explosion-proof valve 510. This can prevent the bracket 200 from blocking or obstructing the pressure relief path of the explosion-proof valve 510, and ensure that gas can flow smoothly through the through hole to the explosion-proof valve 510 when pressure relief is required.

[0054] For example, along the first direction, the two ends of the protrusion 202 are respectively provided with a fifth through hole 223. The fifth through hole 223 penetrates the bracket 200 along the direction from the base plate 110 to the bracket 200. Since the projection of the hole wall of the fifth through hole 223 on the base plate 110 is staggered from the explosion-proof valve 510, the bracket 200 can avoid blocking or obstructing the pressure relief path of the explosion-proof valve 510, ensuring that when pressure relief is required, the gas can flow smoothly through the through hole to the explosion-proof valve 510.

[0055] Reference Figure 7 , Figure 7 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present invention, with the buffer component hidden in the diagram. For example... Figure 7 As shown, in this embodiment, the housing 100 also includes a first side plate 120 and a second side plate 130, and a bottom plate 110 is connected between the first side plate 120 and the second side plate 130. The first side plate 120 and the second side plate 130 are arranged opposite to each other. The first side plate 120 is provided with a first opening 121, and the second side plate 130 is provided with a second opening 131. The first opening 121 and the second opening 131 are both connected to the first groove 111. On the one hand, this facilitates the installation of the electrode assembly 300 and the bracket 200, and on the other hand, it facilitates the manufacturing of the housing 100.

[0056] For example, the first sidewall, the base plate 110 and the second sidewall are connected in sequence to form a U-shaped structure. When the electrode assembly 300 is provided with a relief groove 301, the electrode assembly 300 can move in the direction toward the base plate 110 in the direction from the bracket 200 to the base plate 110 so that the protrusion 202 is accommodated in the relief groove 301, which facilitates the installation of the electrode assembly 300 and the bracket 200, and facilitates the manufacturing of the housing 100.

[0057] It should be noted that the base plate 110, the first side plate 120 and the second side plate 130 are fixedly connected by welding. The welding method includes, but is not limited to, resistance welding, laser welding or ultrasonic welding, and is not limited here.

[0058] For example, the battery pack of the second aspect embodiment of the present invention includes a housing and a plurality of battery cells of the first aspect embodiment of the present invention. The plurality of battery cells are housed in the housing. On the one hand, the stepped portion 112 can enhance the structural strength of the bottom plate 110 to improve the deformation resistance of the bottom plate 110. On the other hand, when the battery cell is impacted from the bottom, the first groove 111 can provide the battery cell with a clearance space to reduce the impact force from being directly transmitted to the electrode assembly 300, thereby reducing the risk of the battery pack catching fire and exploding.

[0059] For example, the battery pack includes a housing and individual battery cells housed within the housing. The bottom plate 110 is located near the bottom of the housing. When the bottom of the housing is scratched or impacted, the bottom plate 110 has a first groove 111 on its outer side. The first groove 111 provides clearance space for the individual battery cells. This clearance space can prevent deformation caused by the scratching or impact on the housing, thereby reducing the direct transmission of impact force to the electrode assembly 300. Furthermore, the stepped portion 112 can enhance the structural strength of the bottom plate 110, thereby improving the deformation resistance of the bottom plate 110 and reducing the risk of fire and explosion of the battery pack.

[0060] Since the battery pack adopts all the technical solutions of the battery cells in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be described in detail here.

[0061] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A single battery cell, characterized in that, include: The housing (100) has a receiving cavity (101). The housing (100) includes a bottom plate (110) and a stepped portion (112). The stepped portion (112) is connected to the bottom plate (110). The bottom plate (110) has a first groove (111) on the side away from the receiving cavity (101). The first groove (111) extends toward the receiving cavity (101) to form the stepped portion (112) on the inner side of the bottom plate (110). An electrode assembly (300) is disposed within the receiving cavity (101).

2. The battery cell according to claim 1, characterized in that: The battery cell also includes a bracket (200), which is disposed in the receiving cavity (101) and connected to the base plate (110). The bracket (200) has a second groove (201) on the side facing the base plate (110), and the stepped portion (112) is accommodated in the second groove (201).

3. The battery cell according to claim 2, characterized in that: The bracket (200) includes a protrusion (202) located on the side of the bracket (200) away from the base plate (110), and the electrode assembly (300) is provided with a relief groove (301), in which the protrusion (202) is accommodated.

4. The battery cell according to claim 3, characterized in that: The electrode assembly (300) includes a bare cell (310) and an annular insulating member (320). The annular insulating member (320) is hollow inside to form an isolation cavity (321). The bare cell (310) is housed in the isolation cavity (321). The bare cell (310) has a first default portion, and the annular insulating member (320) has a second default portion. The first default portion and the second default portion are connected to form the clearance groove (301).

5. The battery cell according to claim 2, characterized in that: The bracket (200) includes a first connecting plate (210), a cross plate (220), and a second connecting plate (230). The cross plate (220) is connected between the first connecting plate (210) and the second connecting plate (230). The first connecting plate (210), the cross plate (220), and the second connecting plate (230) enclose and form the second groove (201). The first connecting plate (210) and the second connecting plate (230) are located on both sides of the step portion (112).

6. The battery cell according to claim 5, characterized in that: The first connecting plate (210) is provided with a first through hole (211), and / or the second connecting plate (230) is provided with a second through hole (231).

7. The battery cell according to claim 5, characterized in that: The cross plate (220) is provided with a third through hole (221) communicating with the second groove (201) on the side facing the first connecting plate (210), and / or, the cross plate (220) is provided with a fourth through hole (222) communicating with the second groove (201) on the side facing the second connecting plate (230).

8. The battery cell according to claim 2, characterized in that: The electrode assembly (300) has a first planar structure on the side facing the base plate (110), and the bracket (200) has a second planar structure on the side away from the base plate (110). The first planar structure is connected to the second planar structure.

9. The battery cell according to claim 1, characterized in that: The battery cell also includes an explosion-proof valve (510), and the groove wall of the first groove (111) has a pressure relief port (102) that communicates with the receiving cavity (101). The explosion-proof valve (510) is connected to the base plate (110) and covers the pressure relief port (102).

10. The battery cell according to claim 9, characterized in that: The battery cell also includes a buffer (520), the buffer (520) having a clearance hole (521), at least a portion of the buffer (520) being accommodated in the first groove (111), along the axial direction of the clearance hole (521), the projection of the explosion-proof valve (510) on the base plate (110) is located within the projection of the hole wall of the clearance hole (521) on the base plate (110).

11. The battery cell according to claim 9, characterized in that: The battery cell also includes a bracket (200), which is disposed in the receiving cavity (101) and connected to the base plate (110). The bracket (200) is disposed opposite to the base plate (110). The bracket (200) has a fifth through hole (223) on the side facing the base plate (110). Along the direction from the bracket (200) to the base plate (110), the projection of the hole wall of the fifth through hole (223) on the base plate (110) is offset from the explosion-proof valve (510).

12. The battery cell according to claim 1, characterized in that: The housing (100) further includes a first side plate (120) and a second side plate (130). The bottom plate (110) is connected between the first side plate (120) and the second side plate (130). The first side plate (120) and the second side plate (130) are arranged opposite to each other. The first side plate (120) is provided with a first opening (121), and the second side plate (130) is provided with a second opening (131). Both the first opening (121) and the second opening (131) are connected to the first groove (111).

13. A battery pack, characterized in that, include: Box; The battery cells according to any one of claims 1 to 12, wherein the plurality of battery cells are housed in the housing.

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