Secondary battery and electric device

Abstract

The utility model discloses a secondary battery and a power utilization device, and belongs to the technical field of batteries, the secondary battery comprises a shell, a top cover assembly and an electrode assembly, and the shell is provided with a containing cavity; comprising a plate body and a pole, the plate body is connected with the shell, the plate body covers and seals the containing cavity, the plate body has a thickness direction, the plate body has a first surface and a second surface which deviate from each other in the thickness direction, and the second surface faces the containing cavity; the plate body is provided with a pole column hole, the pole column hole penetrates through the first surface and the second surface along the thickness direction, and the pole column penetrates through the pole column hole and is connected with the plate body; the electrode assembly is arranged in the accommodating cavity and is connected with the pole; wherein the plate body is provided with a first accommodating groove, an opening of the first accommodating groove penetrates through the second surface, and the pole hole and the first accommodating groove are arranged at an interval. According to the anti-explosion valve, the first containing groove is formed and can contain the electrolyte, so that the shell can deform towards the containing cavity, and the situation that the anti-explosion valve fails or the shell generates plastic deformation is avoided.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to secondary batteries and electrical devices. Background Art

[0002] When the secondary battery is being constrained and divided into different capacities, the large surface of the shell will be subjected to a clamping force and will be recessed toward the electrode assembly to avoid gaps between the electrodes when charging and discharging.

[0003] However, since there is electrolyte inside the secondary battery, the electrolyte will exert pressure on the side of the shell and the explosion-proof valve under the action of the clamping force, causing irreversible deformation of the side of the shell or the explosion-proof valve. Utility Model Content

[0004] Purpose of the utility model: The present application provides a secondary battery for solving the technical problem of irreversible deformation of the side and top cover of the shell caused by constrained capacity division; another purpose of the present application is to provide an electrical device.

[0005] Technical solution: This application provides a secondary battery, including:

[0006] a housing, wherein the housing has a receiving cavity;

[0007] A top cover assembly includes a plate body and a pole, the plate body being connected to the housing and covering the accommodating cavity, the plate body having a thickness direction, the plate body having a first surface and a second surface facing away from each other along the thickness direction, the second surface facing the accommodating cavity; the plate body having a pole hole, the pole hole penetrating the first surface and the second surface along the thickness direction, the pole being inserted into the pole hole and connected to the plate body;

[0008] an electrode assembly, the electrode assembly being disposed in the accommodating cavity and connected to the electrode post;

[0009] The plate body has a first accommodating groove, an opening of the first accommodating groove passes through the second surface, and the pole hole is spaced apart from the first accommodating groove.

[0010] In some embodiments, the shell has a first inner wall, and the shell has a second accommodating groove, and an opening of the second accommodating groove passes through the first inner wall.

[0011] In some embodiments, the plate body further has a length direction and a width direction, and the length direction, the width direction and the thickness direction intersect with each other;

[0012] The electrode assembly has large surfaces arranged opposite to each other along the width direction and side surfaces arranged opposite to each other along the length direction;

[0013] The housing has a first inner wall and a second inner wall, the first inner wall and the second inner wall are connected, the first inner wall is arranged opposite to the large surface along the width direction, and the second inner wall is arranged opposite to the side surface along the length direction;

[0014] The second inner wall has the second accommodating groove.

[0015] In some embodiments, the second receiving groove has a guide wall, the guide wall is connected to the second inner wall, and the guide wall is arranged obliquely to the second surface.

[0016] In some embodiments, the second inner wall has a plurality of second accommodating grooves, the plurality of second accommodating grooves are spaced apart along the width direction, and the second accommodating grooves extend along the thickness direction.

[0017] In some embodiments, the second inner wall further has a plurality of second accommodating grooves arranged at intervals, and among two adjacent second accommodating grooves, one of the second accommodating grooves is arranged to surround the other second accommodating groove.

[0018] In some embodiments, the plate body further has a length direction and a width direction, and the length direction, the width direction and the thickness direction intersect with each other;

[0019] The electrode assembly has large surfaces arranged opposite to each other along the width direction and side surfaces arranged opposite to each other along the length direction;

[0020] The housing has a first inner wall and a second inner wall, the first inner wall and the second inner wall are connected, the first inner wall is arranged opposite to the large surface along the width direction, and the second inner wall is arranged opposite to the side surface along the length direction;

[0021] The secondary battery further includes a protrusion, which is disposed between the large surface and the first inner wall, connected to the first inner wall, and spaced apart from the large surface.

[0022] In some embodiments, the protrusion has a contact surface and a connecting surface that are opposite to each other along the width direction, the connecting surface is connected to the first inner wall, and the contact surface faces the large surface; along the length direction, the maximum distance between the contact surface and the connecting surface along the width direction first decreases and then increases.

[0023] In some embodiments, the protrusion includes a plurality of protrusions, the plurality of protrusions are connected to the first inner wall, and the plurality of protrusions are spaced apart along the length direction; the protrusion has an end surface facing the large surface, and the end surfaces of the plurality of protrusions form the contact surface.

[0024] In some embodiments, the secondary battery includes a plurality of protrusions, and the plurality of protrusions are spaced apart along the thickness direction.

[0025] In some embodiments, the secondary battery includes a plurality of protrusions, and among two adjacent protrusions, one of the protrusions is disposed around the other protrusion.

[0026] In some embodiments, the protrusion extends along the thickness direction.

[0027] Correspondingly, the present application also provides an electrical device, comprising a secondary battery as described in any one of the above embodiments.

[0028] Beneficial effects: Compared with the prior art, the secondary battery provided by the embodiment of the present application includes a shell, a top cover assembly and an electrode assembly, the shell has a accommodating cavity; includes a plate body and a pole, the plate body is connected to the shell, the plate body covers the accommodating cavity, the plate body has a thickness direction, the plate body has a first surface and a second surface that are opposite to each other along the thickness direction, and the second surface faces the accommodating cavity; the plate body has a pole hole, the pole hole passes through the first surface and the second surface along the thickness direction, the pole is passed through the pole hole and connected to the plate body; the electrode assembly is arranged in the accommodating cavity, and the electrode assembly is connected to the pole; wherein the plate body has a first accommodating groove, the opening of the first accommodating groove passes through the second surface, and the pole hole is spaced apart from the first accommodating groove. By setting the first accommodating groove, the present application can accommodate electrolyte, so that the shell can deform toward the accommodating cavity, avoiding failure of the explosion-proof valve or plastic deformation of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0030] Figure 1 A schematic diagram of patch installation of a secondary battery provided in an embodiment of the present application;

[0031] Figure 2 A schematic structural diagram of a top cover in a secondary battery provided in an embodiment of the present application;

[0032] Figure 3 A schematic structural diagram of a secondary battery housing provided in an embodiment of the present application;

[0033] Figure 4 A schematic structural diagram of a secondary battery housing provided in one embodiment of the present application;

[0034] Figure 5 A schematic structural diagram of a secondary battery housing provided in another embodiment of the present application;

[0035] Figure 6A top view of a housing of a secondary battery provided in another embodiment of the present application;

[0036] Figure 7 for Figure 6 Detailed view of the middle frame B;

[0037] Figure 8 for Figure 6 Cross-sectional view at AA in the middle;

[0038] Figure 9 for Figure 8 Detail of the center circle C;

[0039] Figure 10 A schematic structural diagram of a secondary battery housing according to another embodiment of the present application;

[0040] Figure 11 A top view of a housing of a secondary battery provided in another embodiment of the present application;

[0041] Figure 12 for Figure 11 Cross-sectional view at DD in the middle;

[0042] Figure 13 for Figure 11 Cross-sectional view at EE;

[0043] Figure 14 A schematic structural diagram of a secondary battery housing according to another embodiment of the present application;

[0044] Figure 15 A top view of a housing of a secondary battery provided in yet another embodiment of the present application;

[0045] Figure 16 for Figure 15 Cross-sectional view at FF;

[0046] Figure 17 for Figure 15 Cross-sectional view at GG in the middle;

[0047] Figure 18 A front view of a top cover of a secondary battery provided in an embodiment of the present application;

[0048] Figure 19 for Figure 18 Detail of the center circle H.

[0049] Figure markings, 100-shell, 110-inner circumference, 111-first inner wall, 112-second inner wall, 120-outer circumference, 121-first outer wall, 122-second outer wall, 130-accommodation chamber, 140-second accommodation groove, 141-guide wall, 200-top cover assembly, 210-plate body, 211-first surface, 212-second surface, 213-pole hole, 214-first accommodation groove, 220-pole, 300-electrode assembly, 310-large surface, 320-side, 400-protrusion, 410-contact surface, 420-connection surface, 430-protrusion, 431-end face. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically limited. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0052] It should also be noted that in the drawings of the embodiments of the present application, the arrows marked X, Y, and Z respectively represent the length direction X, the width direction Y, and the thickness direction Z. The description of the present application introduces the length direction X, the width direction Y, and the thickness direction Z in order to more clearly express the relative positional relationship involved in the present application, wherein the length direction X, the width direction Y, and the thickness direction Z are three relative directions that intersect with each other, rather than absolute directions. In actual applications, the length direction X, the width direction Y, and the thickness direction Z can point to any direction in space as long as the intersection relationship between the two is maintained.

[0053] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0054] When the secondary battery is being constrained and divided into different capacities, the large surface 310 of the shell 100 is subjected to a clamping force and is recessed toward the electrode assembly 300 to avoid gaps between the electrode sheets during charge and discharge.

[0055] However, since there is still electrolyte inside the secondary battery, under the action of the clamping force, the shell 100 is concave inward along the width direction Y, and the size of the accommodating cavity 130 along the width direction Y is reduced. The electrolyte in the accommodating cavity 130 flows toward the top cover along the height direction and toward the side 320 of the shell 100 along the length direction X and exerts pressure on the side 320 of the shell 100 and the explosion-proof valve, which will cause irreversible deformation of the side 320 of the shell 100 or the explosion-proof valve.

[0056] In order to solve the technical problem that the side surface 320 or the explosion-proof valve of the housing 100 may produce irreversible deformation when the secondary battery is constrained and divided, the first embodiment of the present application provides a secondary battery. Figure 1 and Figure 2 The secondary battery comprises a housing 100, a top cover assembly 200 and an electrode assembly 300. The housing 100 has a receiving cavity 130; the housing 100 comprises a plate 210 and a pole 220. The plate 210 is connected to the housing 100 and covers the receiving cavity 130. The plate 210 has a thickness direction Z. The plate 210 has a first surface 211 and a second surface 212 that are opposite to each other along the thickness direction Z. The second surface 212 faces the receiving cavity 130. The plate 210 has a pole 220. 0 hole 213, the pole 220 hole 213 passes through the first surface 211 and the second surface 212 along the thickness direction Z, the pole 220 is arranged in the pole 220 hole 213 and is connected to the plate body 210; the electrode assembly 300 is arranged in the accommodating cavity 130, and the electrode assembly 300 is connected to the pole 220; wherein, the plate body 210 has a first accommodating groove 214, the opening of the first accommodating groove 214 passes through the second surface 212, and the pole 220 hole 213 is spaced apart from the first accommodating groove 214.

[0057] In some embodiments, the plate body 210 has a plurality of first receiving slots 214 , and the plurality of first receiving slots 214 are arranged at intervals. The plurality of first receiving slots 214 are provided to further increase additional space for storing electrolyte.

[0058] In some embodiments, the plurality of first receiving slots 214 are spaced apart along the length direction X; in some embodiments, the plurality of first receiving slots 214 are spaced apart along the width direction Y; in some embodiments, the plurality of first receiving slots 214 are spaced apart along both the length direction X and the width direction Y to form an array.

[0059] In the above embodiment, the first receiving groove 214 located on the plate 210 can provide additional space after the shell 100 is squeezed to store the electrolyte flowing toward the top cover, thereby preventing the electrolyte from being unable to be further compressed after being squeezed by the shell 100 and exerting pressure on the side 320 of the shell 100 or the explosion-proof valve, thereby reducing the possibility of irreversible deformation of the side 320 of the shell 100 and the explosion-proof valve when constraining the volume division.

[0060] In some embodiments, see Figure 3 The housing 100 has a first inner wall 111 , and the housing 100 has a second receiving groove 140 . The opening of the second receiving groove 140 passes through the first inner wall 111 .

[0061] In some embodiments, the groove wall of the second receiving groove 140 is a curved surface. Specifically, the groove wall of the second receiving groove 140 is a spherical surface.

[0062] In the above embodiment, after the shell 100 is squeezed, it is deformed toward the accommodating chamber 130, the size of the accommodating chamber 130 in the width direction Y is reduced, and the liquid level of the electrolyte rises and enters the second accommodating chamber 130 along the length direction X, so as to avoid the electrolyte exerting pressure on the side 320 of the shell 100 or the explosion-proof valve due to the reduction in the size of the accommodating chamber 130 in the width direction Y, thereby reducing the possibility of irreversible deformation of the side 320 of the shell 100 and the explosion-proof valve when constraining the volume division.

[0063] In some embodiments, please refer again to Figure 3 The plate body 210 also has a length direction X and a width direction Y, and the length direction X, the width direction Y and the thickness direction Z intersect each other; the electrode assembly 300 has large surfaces 310 arranged opposite to each other along the width direction Y and side surfaces 320 arranged opposite to each other along the length direction X; the shell 100 has a first inner wall 111 and a second inner wall 112, the first inner wall 111 and the second inner wall 112 are connected, the first inner wall 111 and the large surface 310 are arranged opposite to each other along the width direction Y, and the second inner wall 112 and the side surface 320 are arranged opposite to each other along the length direction X; the second inner wall 112 has a second accommodating groove 140.

[0064] In some embodiments, the minimum distance between the first inner wall 111 and the outer circumferential surface 120 of the housing 100 is smaller than the minimum distance between the second inner wall 112 and the outer circumferential surface 120 of the housing 100. That is, the thickness of the two portions of the housing 100 that are opposite each other along the width direction Y is smaller than the thickness of the two portions of the housing 100 that are opposite each other along the length direction X. In the above embodiment, the second receiving groove 140 is provided on the second inner wall 112, and the portion of the housing 100 where the second inner wall 112 is located is relatively thick. The provision of the second receiving groove 140 has a minimal impact on the mechanical properties of the housing 100, further preventing the possibility of irreversible deformation of the side surface 320 of the housing 100 after point-decompression pressure.

[0065] In some embodiments, see Figure 8 and Figure 9 The second receiving groove 140 has a guide wall 141 , which is connected to the second inner wall 112 , and the guide wall 141 is arranged obliquely to the second surface 212 .

[0066] In some embodiments, the guide wall 141 is a plane. Specifically, the included angle between the guide wall 141 and the second inner wall 112 is an acute angle or an obtuse angle, and the included angle between the guide wall 141 and the plane on which the second surface 212 lies is an acute angle or an obtuse angle. The guide wall 141, which is arranged obliquely with respect to the second surface 212, faces the second surface 212, so that the electrolyte can flow downward under the action of gravity while also flowing toward the accommodating cavity 130 under the guidance of the guide wall 141.

[0067] It is understood that the second storage tank 140 is only used to temporarily store the electrolyte. During battery operation, the electrolyte must remain within the storage chamber 130. In the above embodiment, the guide wall 141 is provided so that after the restrained volume separation is completed and the housing 100 returns to its original state, the electrolyte can be guided into the storage chamber 130 by the guide wall 141 under the action of gravity, thereby preventing electrolyte from remaining in the second storage tank 140 and causing the electrolyte level in the storage chamber 130 to be low.

[0068] In some embodiments, please refer again to Figure 3 、 Figure 4 and Figure 5 The second inner wall 112 has a plurality of second accommodating grooves 140. The plurality of second accommodating grooves 140 are arranged at intervals along the width direction Y and the plurality of second accommodating grooves 140 are also arranged at intervals along the thickness direction Z. That is, the plurality of second accommodating grooves 140 are arranged in an array in the length direction X and the thickness direction Z to further expand the capacity of the second accommodating grooves 140 to store electrolyte, thereby further avoiding the possibility of irreversible deformation of the side surface 320 of the shell 100 after being pressurized by the electrolyte.

[0069] In some embodiments, please refer again to Figure 10 and Figure 13 The second inner wall 112 has a plurality of second accommodating grooves 140 , which are spaced apart along the width direction Y and extend along the thickness direction Z.

[0070] In other words, in some embodiments, the second inner wall 112 has a plurality of second receiving grooves 140 spaced apart along the width direction Y, and the second receiving grooves 140 are long strip grooves extending along the thickness direction Z.

[0071] In the above embodiment, the elongated groove extending along the thickness direction Z provides more space, and the second receiving groove 140 has a greater capacity for storing electrolyte, further preventing the possibility of irreversible deformation of the side 320 of the housing 100 and the explosion-proof valve. In addition, because the housing 100 is continuously pressurized and the electrolyte level continues to rise, the second receiving groove 140 extending along the thickness direction Z can promptly introduce electrolyte as the electrolyte level rises, thereby effectively preventing irreversible deformation of the side 320 of the housing 100 and the explosion-proof valve.

[0072] In some embodiments, see Figure 14 and Figure 17 The second inner wall 112 further has a plurality of second accommodating grooves 140 arranged at intervals. Among two adjacent second accommodating grooves 140 , one second accommodating groove 140 is arranged to surround the other second accommodating groove 140 .

[0073] In some embodiments, a portion of the second accommodating groove 140 extends along the width direction Y, a portion of the second accommodating groove 140 extends along the thickness direction Z, and the portion of the second accommodating groove 140 extending along the width direction Y is connected to the portion of the second accommodating groove 140 along the thickness direction Z.

[0074] In some embodiments, along the width direction Y, the portion of the second accommodating groove 140 extending along the width direction Y is located between the portions of the two second accommodating grooves 140 extending along the thickness direction Z, and is connected to the portions of the two second accommodating grooves 140 extending along the thickness direction Z; along the thickness direction Z, the portion of the second accommodating groove 140 extending along the thickness direction Z is located between the portions of the two second accommodating grooves 140 extending along the width direction Y, and is connected to the portions of the two second accommodating grooves 140 extending along the width direction Y.

[0075] In the above embodiment, the second receiving groove 140 that can surround the adjacent second receiving groove 140 extends in the width direction Y and the thickness direction Z, which can improve the ability of the second receiving groove 140 to store electrolyte, thereby further avoiding the possibility of irreversible deformation of the side 320 of the shell 100 after being pressurized by the electrolyte.

[0076] In some embodiments, see Figure 3The plate body 210 further has a length direction X and a width direction Y, and the length direction X, the width direction Y and the thickness direction Z intersect in pairs; the electrode assembly 300 has large surfaces 310 arranged opposite to each other along the width direction Y and side surfaces 320 arranged opposite to each other along the length direction X; the shell 100 has a first inner wall 111 and a second inner wall 112, the first inner wall 111 and the second inner wall 112 are connected, the first inner wall 111 and the large surface 310 are arranged opposite to each other along the width direction Y, and the second inner wall 112 and the side surface 320 are arranged opposite to each other along the length direction X; the secondary battery further includes a protrusion 400, the protrusion 400 is arranged between the large surface 310 and the first inner wall 111, the protrusion 400 is connected to the first inner wall 111, and the protrusion 400 is spaced apart from the large surface 310.

[0077] In the above embodiment, the protrusions 400 are provided to increase the thickness of the housing 100 at opposite portions along the width direction Y, so that the housing 100 can contact the electrode assembly 300 with minimal deformation.

[0078] It is understood that the protrusion 400 can contact the electrode assembly 300 earlier than the first inner wall 111, thereby reducing the extent of deformation required of the housing 100 during capacity division. In the above embodiment, the protrusion 400 is provided to reduce the degree of deformation of the housing 100 in the width direction Y during capacity division, thereby reducing the degree of dimensional change of the accommodating cavity 130 in the width direction Y, thereby reducing the pressure exerted by the electrolyte on the side surface 320 of the housing 100 and the explosion-proof valve, and reducing the possibility of irreversible deformation of the side surface 320 of the housing 100 and the explosion-proof valve.

[0079] In some embodiments, see Figure 4 、 Figure 5 and 7 The protrusion 400 has a contact surface 410 and a connecting surface 420 that are opposite to each other along the width direction Y, the connecting surface 420 is connected to the first inner wall 111, and the contact surface 410 faces the large surface 310; along the length direction X, the maximum distance between the contact surface 410 and the connecting surface 420 along the width direction Y first decreases and then increases.

[0080] It is understood that, along the length direction X, the portion of the housing 100 closer to the center has poorer mechanical properties and experiences greater deformation along the width direction Y. Conversely, the portions of the housing 100 closer to the sides have better mechanical properties and experience less deformation along the width direction Y. In the above embodiment, the maximum distance between the contact surface 410 and the connection surface 420 along the width direction Y is first reduced and then increased. This allows the housing 100 to apply a more uniform compressive force to the electrode assembly 300 along the length direction X when deformed, further reducing the risk of electrode wrinkling.

[0081] In some embodiments, see Figure 3 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 10 and Figure 12 The protruding portion 400 includes a plurality of protrusions 430 connected to the first inner wall 111 and spaced apart along the length direction X. The protrusions 430 have end surfaces 431 facing the large surface 310 , and the end surfaces 431 of the plurality of protrusions 430 form contact surfaces 410 .

[0082] In the above embodiment, the multiple protrusions 430 are arranged at intervals along the length direction X, which can make the shell 100 more easily deformed in the width direction Y, thereby reducing the restraining force applied to the shell 100 during the restraint and capacity division, and reducing the difficulty of the restraint and capacity division operation.

[0083] In some embodiments, see Figure 3 、 Figure 4 and Figure 5 The secondary battery includes a plurality of protrusions 400 , and the plurality of protrusions 400 are spaced apart along the thickness direction Z.

[0084] In other words, the plurality of protrusions 430 are spaced apart in both the length direction X and the thickness direction Z, so that the plurality of protrusions 430 form an array in both the length direction X and the thickness direction Z.

[0085] In the above embodiment, by arranging the protrusions 400 at intervals in the thickness direction Z, the force on the electrode assembly 300 in the thickness direction Z can be made more uniform, thereby further improving the wrinkling phenomenon of the electrode sheet.

[0086] In some embodiments, see Figure 14 、 Figure 15 and Figure 16 The secondary battery includes a plurality of protrusions 400 , and among two adjacent protrusions 400 , one protrusion 400 is disposed around the other protrusion 400 .

[0087] In the above embodiment, a plurality of protrusions 400 are provided, and one of two adjacent protrusions 400 surrounds the other, so that the contact surface 410 between the protrusion 400 and the electrode assembly 300 is increased, so that the forces acting on the electrode assembly 300 in the length direction X and the thickness direction Z are more uniform, further improving the phenomenon of electrode wrinkling.

[0088] In some embodiments, see Figure 10 、 Figure 11 and Figure 12 , the protrusion 430 extends along the thickness direction Z.

[0089] In other words, the protrusion 430 is a long strip-shaped protrusion 430 extending along the thickness direction Z.

[0090] In the above embodiment, the protrusion 430 is provided to extend along the thickness direction Z, so that the pressing force on the electrode assembly 300 can be more uniform in the thickness direction Z when the housing 100 is deformed.

[0091] In some embodiments, see Figure 18 and Figure 19 A minimum distance H1 mm is provided between the groove wall of the first receiving groove 214 opposite to the opening and the first surface 211 along the thickness direction Z, satisfying: 0.5≤H1≤1.0.

[0092] Specifically, the value of H1 mm can be any one of 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0, or any value within a range consisting of any two of these values. A larger value for H1 mm increases the space in first receiving tank 214, allowing it to store more electrolyte. A smaller value for H1 mm improves the mechanical properties of plate 210 and enhances the reliability of the secondary battery.

[0093] In the above embodiment, when the value of H1 mm is within the range defined in the embodiments of the present application, the first receiving tank 214 can provide a larger space for temporarily storing the electrolyte, thereby improving the effectiveness of the first receiving tank 214 in preventing irreversible deformation of the side 320 of the housing 100 and the explosion-proof valve. At the same time, it can also avoid significantly weakening the mechanical properties of the plate 210, thereby ensuring the reliability of the secondary battery.

[0094] In some embodiments, see Figure 8 and Figure 9 The shell 100 also has an outer peripheral surface 120, which is opposite to the inner peripheral surface 110; the outer peripheral surface 120 also has a second outer wall 122 which is opposite to the second inner wall 112; the groove wall of the second accommodating groove 140 and the second outer wall 122 have a minimum thickness H2 mm along the length direction X, satisfying: 0.2≤H2≤0.5.

[0095] Specifically, the value of H2 mm can be any one of 0.2, 0.3, 0.4, and 0.5, or any value within a range consisting of any two of these values. A larger value for H2 mm increases the space in first receiving tank 214, allowing it to store more electrolyte. A smaller value for H2 mm improves the mechanical properties of housing 100 and enhances the reliability of the secondary battery.

[0096] In the above embodiment, when the value of H2 mm is within the range defined in the embodiments of the present application, the second receiving tank 140 can provide a larger space for temporarily storing the electrolyte, thereby improving the effectiveness of the second receiving tank 140 in preventing irreversible deformation of the side 320 of the housing 100 and the explosion-proof valve. At the same time, it can also avoid significantly weakening the mechanical properties of the plate 210, thereby ensuring the reliability of the secondary battery.

[0097] In some embodiments, see Figure 6 and Figure 7 The shell 100 also has an outer peripheral surface 120, which is opposite to the inner peripheral surface 110; the outer peripheral surface 120 has a first outer wall 121 which is opposite to the first inner wall 111; the protrusion 400 and the first outer wall 121 have a maximum thickness H3 mm along the width direction Y, satisfying: 0.3≤H3≤0.7.

[0098] Specifically, the value of H3 mm can be any one of 0.3, 0.4, 0.5, 0.6, and 0.7, or any value within a range consisting of any two of these values. A larger value for H3 mm increases the size of the protrusion 400 along the width direction Y, and the required deformation of the housing 100 in the width direction Y during capacity division is reduced. A smaller value for H3 mm also decreases the size of the protrusion 400 along the width direction Y, reducing the volume of the protrusion 400 and the space occupied by the housing cavity 130. This improves the space utilization of the housing cavity 130 and results in a higher volumetric energy density for the secondary battery.

[0099] In the above embodiment, when the value of H3 mm is within the range defined in the embodiment of the present application, the degree of deformation of the shell 100 along the width direction Y during capacity division is small, and the space utilization rate within the secondary battery is high, and the volume energy density is higher.

[0100] In some embodiments, the area of ​​the second inner wall 112 is S1 mm 2 The area of ​​the orthographic projection of the second accommodating groove 140 along the length direction X on any one of the second inner walls 112 is S2 mm 2 , satisfying: 0.5≤S2 / S1≤0.7.

[0101] Specifically, the value of S2 / S1 can be any one of 0.5, 0.6, and 0.7, or any value within a range consisting of any two of these values. A larger S2 / S1 value allows the second holding tank 140 to store more electrolyte. A smaller S2 / S1 value improves the mechanical properties of the housing 100 and the reliability of the secondary battery.

[0102] In the above embodiment, when the value of S2 / S1 is within the range defined in the embodiments of the present application, the second receiving tank 140 can provide a larger space for temporarily storing the electrolyte, thereby improving the effectiveness of the second receiving tank 140 in preventing irreversible deformation of the side 320 of the housing 100 and the explosion-proof valve. At the same time, it can also avoid significantly weakening the mechanical properties of the plate 210, thereby ensuring the reliability of the secondary battery.

[0103] In some embodiments, the area of ​​the first inner surface is S3 mm 2 The area of ​​the projection 400 along the width direction Y on any one of the first inner surfaces is S4 mm 2 , satisfying: 1 / 2≤S4 / S3≤2 / 3.

[0104] Specifically, the value of S4 / S3 can be any one of 1 / 2, 1 / 3, or 2 / 3, or any value within a range consisting of any two values. A larger value of S4 / S3 increases the total volume of the multiple protrusions 400, and the required degree of deformation of the housing 100 in the width direction Y during capacity division is reduced. A smaller value of S4 / S3 also reduces the total volume of the protrusions 400, resulting in less space occupied by the housing cavity 130, improving the space utilization of the housing cavity 130, and increasing the volumetric energy density of the secondary battery.

[0105] In the above embodiment, when the value of S4 / S3 is within the range defined by the embodiment of the present application, the degree of deformation of the shell 100 along the width direction Y during capacity division is smaller, and the space utilization rate within the secondary battery is higher, and the volume energy density is higher.

[0106] Accordingly, the present application also provides an electrical device, including a secondary battery as in any one of the above embodiments, and the secondary battery is used to power the electrical device. Among them, the electrical device can be an application device such as a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an energy storage cabinet, and an electric tool. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0107] The above is a detailed introduction to a secondary battery and an electrical device provided in the embodiments of the present application. Specific examples are used in this application to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements 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 secondary battery, characterized in that: include: a housing, wherein the housing has a receiving cavity; A top cover assembly includes a plate body and a pole, the plate body being connected to the housing and covering the accommodating cavity, the plate body having a thickness direction, the plate body having a first surface and a second surface facing away from each other along the thickness direction, the second surface facing the accommodating cavity; the plate body having a pole hole, the pole hole penetrating the first surface and the second surface along the thickness direction, the pole being inserted into the pole hole and connected to the plate body; an electrode assembly, the electrode assembly being disposed in the accommodating cavity and connected to the electrode post; The plate body has a first accommodating groove, an opening of the first accommodating groove passes through the second surface, and the pole hole is spaced apart from the first accommodating groove.

2. The secondary battery according to claim 1, wherein The shell has a first inner wall, and the shell has a second accommodating groove, wherein an opening of the second accommodating groove passes through the first inner wall.

3. The secondary battery according to claim 2, wherein: The plate body also has a length direction and a width direction, and the length direction, the width direction and the thickness direction intersect with each other; The electrode assembly has large surfaces arranged opposite to each other along the width direction and side surfaces arranged opposite to each other along the length direction; The housing has a first inner wall and a second inner wall, the first inner wall and the second inner wall are connected, the first inner wall is arranged opposite to the large surface along the width direction, and the second inner wall is arranged opposite to the side surface along the length direction; The second inner wall has the second accommodating groove.

4. The secondary battery according to claim 3, wherein The second accommodating groove has a guide wall, the guide wall is connected to the second inner wall, and the guide wall is arranged obliquely to the second surface.

5. The secondary battery according to claim 3, wherein The second inner wall has a plurality of second accommodating grooves, the plurality of second accommodating grooves are spaced apart along the width direction, and the second accommodating grooves extend along the thickness direction.

6. The secondary battery according to claim 3, wherein The second inner wall further has a plurality of second accommodating grooves arranged at intervals, and among two adjacent second accommodating grooves, one of the second accommodating grooves is arranged around the other second accommodating groove.

7. The secondary battery according to claim 1, wherein The plate body also has a length direction and a width direction, and the length direction, the width direction and the thickness direction intersect with each other; The electrode assembly has large surfaces arranged opposite to each other along the width direction and side surfaces arranged opposite to each other along the length direction; The housing has a first inner wall and a second inner wall, the first inner wall and the second inner wall are connected, the first inner wall is arranged opposite to the large surface along the width direction, and the second inner wall is arranged opposite to the side surface along the length direction; The secondary battery further includes a protrusion, which is disposed between the large surface and the first inner wall, connected to the first inner wall, and spaced apart from the large surface.

8. The secondary battery according to claim 7, wherein: The protrusion has a contact surface and a connecting surface that are opposite to each other along the width direction, the connecting surface is connected to the first inner wall, and the contact surface faces the large surface; along the length direction, the maximum distance between the contact surface and the connecting surface along the width direction first decreases and then increases.

9. The secondary battery according to claim 8, characterized in that The protruding portion includes a plurality of protrusions, the plurality of protrusions are connected to the first inner wall, and the plurality of protrusions are spaced apart along the length direction; the protrusions have end surfaces facing the large surface, and the end surfaces of the plurality of protrusions form the contact surface.

10. The secondary battery according to claim 8, wherein The secondary battery includes a plurality of protrusions, and the plurality of protrusions are arranged at intervals along the thickness direction.

11. The secondary battery according to claim 8, wherein The secondary battery includes a plurality of protrusions, and among two adjacent protrusions, one of the protrusions is arranged around the other protrusion.

12. The secondary battery according to claim 9, wherein The protrusion extends along the thickness direction.

13. An electrical device, characterized in that: The invention comprises the secondary battery according to any one of claims 1 to 12.

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