Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack. The hole wall of the pole hole in the top cover is provided with a first matching surface; the peripheral wall, close to the electrode assembly, of the pole is provided with a second matching surface; and the first matching surface is opposite to the second matching surface. Wherein the first matching surface and the second matching surface are arranged in an inclined manner, so that the first matching surface and the second matching surface can be matched to limit the pole column to be separated outwards, the size of the pole column protruding towards the accommodating cavity is reduced, the pole column is prevented from occupying the space of the accommodating cavity as much as possible, and the utilization rate of the internal space of the single battery is improved. Moreover, the second matching surface of the pole is positioned in the pole hole and does not extend to the outside of the pole hole, so that the influence of inclined arrangement of the second matching surface on the structural strength of the pole can be reduced, and the structural strength of the pole can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a single cell and a battery pack. Background Art

[0002] The current single cell generally consists of a top cover, an electrode assembly, and a shell. The electrode assembly is placed in a cavity surrounded by the top cover and the shell. The top cover is mainly composed of a top cover sheet, a pole, and a sealing ring. The top cover sheet and the pole cooperate with the compression sealing ring to achieve a sealed connection. However, the pole protrudes into the interior of the single cell, occupying the internal space of the single cell, resulting in a reduced utilization rate of the internal space of the single cell, which is not conducive to improving the energy density of the single cell. In addition, the structural strength of the pole is low. Utility Model Content

[0003] The present application provides a single cell and a battery pack, which are beneficial to improving the utilization rate of the internal space of the single cell and improving the structural strength of the pole.

[0004] The present application provides a single cell battery. The single cell battery has a first direction. The single cell battery includes a shell, and the end of the shell along the first direction has an opening. The single cell battery also includes a top cover, which is covered on the opening, and the top cover is connected to the shell to enclose a receiving cavity, wherein the top cover is provided with a pole hole penetrating along the first direction. The single cell battery also includes an electrode assembly, and the electrode assembly is arranged in the receiving cavity. The single cell battery also includes a pole, part of which is passed through the pole hole, and the pole is electrically connected to the electrode assembly. Among them, the hole wall of the pole hole has a first mating surface, the first mating surface is inclined relative to the first direction, and the first mating surface faces the electrode assembly; the outer peripheral wall of the pole close to the electrode assembly has a second mating surface, the second mating surface is inclined relative to the first direction, and the second mating surface is back to the electrode assembly; the first mating surface and the second mating surface are arranged opposite to each other, and the second mating surface is in the pole hole.

[0005] In one embodiment of the present application, the single battery further has a reference plane parallel to the first direction; wherein the orthographic projection of the second matching surface on the reference plane is located in the orthographic projection of the pole hole on the reference plane.

[0006] In one embodiment of the present application, the single battery further has a second direction perpendicular to the first direction; the angle between the first mating surface and the second direction is θ1, and the angle between the second mating surface and the second direction is θ2; the pole includes a main body and a mating portion connected to each other, the mating portion is located on a side of the main body close to the electrode assembly in the first direction, the size of the mating portion in the second direction is greater than the size of the main body in the second direction, and the outer peripheral wall of the mating portion has a second mating surface; the minimum aperture of the pole hole is D1 mm, and the maximum size of the mating portion in the second direction is D2 mm;

[0007] Among them, it meets:

[0008] In one embodiment of the present application, θ1 and θ2 satisfy: θ1 ≥ θ2.

[0009] In one embodiment of the present application, 0.6<θ2 / θ1≤1.

[0010] In one embodiment of the present application, D1 and D2 satisfy: D1 <D2。

[0011] In one embodiment of the present application, 0.5 <D1 / D2<1。

[0012] In one embodiment of the present application, the single cell battery also includes: an insulating part, including a first insulating part and a second insulating part; the first insulating part is arranged around the outer periphery of the main body, and at least part of the first insulating part is located on the side of the top cover facing away from the electrode assembly, and the first insulating part and the mating part cooperate to limit the relative position of the pole and the top cover in the first direction; the second insulating part is arranged between the first mating surface and the second mating surface.

[0013] In one embodiment of the present application, the surface of the pole facing the electrode assembly is located in the pole hole.

[0014] Accordingly, the present application also provides a battery pack, comprising a single cell as described in the above embodiment.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the present application provides a single cell and a battery pack. The hole wall of the pole hole on the top cover has a first mating surface, the first mating surface is inclined relative to the first direction, and the first mating surface faces the electrode assembly. The outer peripheral wall of the pole close to the electrode assembly has a second mating surface, the second mating surface is inclined relative to the first direction, and the second mating surface is facing away from the electrode assembly. The first mating surface and the second mating surface are arranged opposite to each other. Among them, the first mating surface and the second mating surface are both inclined, not only can the first mating surface and the second mating surface cooperate to limit the pole from escaping outward, but also help to reduce the size of the pole protruding into the accommodating cavity, and avoid the pole occupying the space of the accommodating cavity as much as possible, thereby helping to improve the utilization rate of the internal space of the single cell.

[0016] Furthermore, the second mating surface of the pole is in the pole hole, and the second mating surface does not extend to the outside of the pole hole, which can reduce the influence of the inclined setting of the second mating surface on the structural strength of the pole, thereby facilitating improving the structural strength of the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a single cell of the present application;

[0019] Figure 2 yes Figure 1 Schematic diagram of the exploded structure of the single battery shown;

[0020] Figure 3 It is a structural schematic diagram of an embodiment of a top cover assembly of the present application;

[0021] Figure 4 yes Figure 3 A schematic diagram of the exploded structure of the top cover assembly shown;

[0022] Figure 5 yes Figure 3 A schematic diagram of the cross-sectional structure of the top cover assembly in the AA direction is shown;

[0023] Figure 6 yes Figure 5 A schematic diagram of the structure of the top cover assembly B area shown;

[0024] Figure 7 It is a structural schematic diagram of an embodiment of a top cover of the present application;

[0025] Figure 8 It is a structural schematic diagram of an embodiment of a pole of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than 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 work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "up", "down", "left", and "right", generally refer to the up, down, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0027] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, 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 specific circumstances.

[0028] The present application provides a single cell and a battery pack, which are described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0029] In order to solve the technical problems of low utilization rate of the internal space of a single cell and low structural strength of a pole in the prior art, an embodiment of the present application provides a single cell. The single cell has a first direction. The single cell includes a shell, and the end of the shell along the first direction has an opening. The single cell also includes a top cover, which is covered on the opening, and the top cover is connected to the shell to enclose a receiving cavity, wherein the top cover is provided with a pole hole penetrating along the first direction. The single cell also includes an electrode assembly, and the electrode assembly is arranged in the receiving cavity. The single cell also includes a pole, part of which is passed through the pole hole, and the pole is electrically connected to the electrode assembly. Among them, the hole wall of the pole hole has a first mating surface, the first mating surface is arranged obliquely relative to the first direction, and the first mating surface faces the electrode assembly; the outer peripheral wall of the pole close to the electrode assembly has a second mating surface, the second mating surface is arranged obliquely relative to the first direction, and the second mating surface faces away from the electrode assembly; the first mating surface is arranged opposite to the second mating surface, and the second mating surface is in the pole hole. The following is a detailed description.

[0030] See also Figures 1 to 4 , Figure 1 is a schematic structural diagram of an embodiment of a single cell of the present application, Figure 2 yes Figure 1 The exploded structure diagram of the single battery is shown. Figure 3 is a structural schematic diagram of an embodiment of a top cover assembly of the present application, Figure 4 yes Figure 3 Schematic diagram of the exploded structure of the top cover assembly shown.

[0031] In one embodiment, the battery pack includes a box and a plurality of single cells 10, and the plurality of single cells 10 are arranged in the box. The single cells 10 include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present disclosure. The battery pack is a power supply for electrical devices. Electrical devices can be mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0032] Specifically, the single cell 10 has a first direction Z. The single cell 10 includes a shell 11, and the end of the shell 11 along the first direction Z has an opening 111. The single cell 10 also includes a top cover 12, the top cover 12 is covered on the opening 111, and the top cover 12 is connected to the shell 11 to enclose a receiving cavity, wherein the top cover 12 is provided with a pole hole 13 passing through along the first direction Z. The single cell 10 also includes an electrode assembly 14, and the electrode assembly 14 is arranged in the receiving cavity. The electrode assembly 14 is formed by stacking or winding pole sheets and diaphragms. The single cell 10 also includes a pole 15, part of the pole 15 is passed through the pole hole 13, and the pole 15 is electrically connected to the electrode assembly 14.

[0033] Please also read Figure 5 and Figure 6 , Figure 5 yes Figure 3 The cross-sectional structure diagram of the top cover assembly in the AA direction is shown. Figure 6 yes Figure 5 A schematic structural diagram of the top cover assembly B area is shown.

[0034] In one embodiment, the hole wall of the pole hole 13 has a first mating surface 131, the first mating surface 131 is tilted relative to the first direction Z, and the first mating surface 131 faces the electrode assembly 14. The outer peripheral wall of the pole 15 close to the electrode assembly 14 has a second mating surface 151, the second mating surface 151 is tilted relative to the first direction Z, and the second mating surface 151 faces away from the electrode assembly 14. The first mating surface 131 and the second mating surface 151 are arranged opposite to each other.

[0035] In the above manner, the first mating surface 131 and the second mating surface 151 of the present embodiment are arranged opposite to each other, and the first mating surface 131 and the second mating surface 151 are arranged at an angle. On the one hand, the first mating surface 131 and the second mating surface 151 can cooperate to limit the pole 15 from coming out (that is, the pole 15 is separated from the top cover 12 in a direction away from the electrode assembly 14); on the other hand, the second mating surface 151 of the pole 15 is arranged at an angle, which can help reduce the size of the pole 15 protruding from the accommodating cavity while ensuring that the top cover 12 can reliably limit the pole 15 from coming out, and avoid the pole 15 occupying the space of the accommodating cavity as much as possible, thereby helping to improve the utilization rate of the internal space of the single cell 10, and further to improve the energy density of the single cell 10.

[0036] Furthermore, the second mating surface 151 of the pole 15 is located in the pole hole 13, and the second mating surface 151 does not extend to the outside of the pole hole 13, that is, the size of the second mating surface 151 in the first direction Z is relatively small, which can reduce the influence of the inclined setting of the second mating surface 151 on the structural strength of the pole 15, thereby helping to improve the structural strength of the pole 15.

[0037] It should be noted that the second mating surface 151 is in the pole hole 13 as follows: the single battery 10 also has a reference plane α parallel to the first direction Z, and the orthographic projection of the second mating surface 151 on the reference plane α is in the orthographic projection of the pole hole 13 on the reference plane α. The second mating surface 151 does not extend to the outside of the pole hole 13 in the first direction Z, which can reduce the influence of the inclined setting of the second mating surface 151 on the structural strength of the pole 15, which is conducive to improving the structural strength of the pole 15.

[0038] Furthermore, the surface 154 of the pole 15 facing the electrode assembly 14 is in the pole hole 13, that is, the orthographic projection of the surface 154 on the reference plane α is in the orthographic projection of the pole hole 13 on the reference plane α. In this way, the bottom of the pole 15 is embedded in the pole hole 13 of the top cover 12, and the pole 15 does not protrude into the accommodating cavity, which minimizes the space occupied by the pole 15 in the accommodating cavity, improves the utilization rate of the internal space of the single battery 10, and is further conducive to improving the energy density of the single battery 10. Figure 6 The situation where the surface 154 of the pole 15 facing the electrode assembly 14 is flush with the surface of the top cover 12 facing the electrode assembly 14 is exemplarily shown, which is only for discussion purposes and is not intended to be limiting.

[0039] In one embodiment, the single battery 10 further has a second direction X perpendicular to the first direction Z. The pole 15 includes a main body 152 and a matching portion 153 connected along the first direction Z, that is, the main body 152 and the matching portion 153 are distributed along the first direction Z. The matching portion 153 is located on a side of the main body 152 close to the electrode assembly 14. Part of the main body 152 and the matching portion 153 are penetrated in the pole hole 13. The size of the matching portion 153 in the second direction X is greater than the size of the main body 152 in the second direction X, and the outer peripheral wall of the matching portion 153 has a second matching surface 151.

[0040] The main body 152 of the pole 15 has a smaller size in the second direction X, so that the main body 152 can extend from the pole hole 13 to the outside of the single battery 10. The matching portion 153 has a larger size in the second direction X, and the matching portion 153 cooperates with the top cover 12 to limit the pole 15 from being separated from the top cover 12 in the direction away from the electrode assembly 14. In addition, the outer peripheral wall of the matching portion 153 has a second matching surface 151, the first matching surface 131 and the second matching surface 151 are arranged opposite to each other, and the first matching surface 131 and the second matching surface 151 are both arranged obliquely, not only the first matching surface 131 and the second matching surface 151 can cooperate to limit the pole 15 from being separated outward, but also it is beneficial to reduce the size of the pole 15 protruding into the accommodating cavity, and avoid the pole 15 occupying the space of the accommodating cavity as much as possible, so as to improve the utilization rate of the internal space of the single battery 10, and further improve the energy density of the single battery 10.

[0041] It should be noted that the surface 154 of the pole 15 facing the electrode assembly 14 described in the above embodiment is in the pole hole 13, that is, the surface of the matching portion 153 facing the electrode assembly 14 is in the pole hole 13. The outer edge of the surface of the matching portion 153 facing the electrode assembly 14 borders the second matching surface 151. The bottom of the matching portion 153 is embedded in the pole hole 13 of the top cover 12, and the matching portion 153 does not protrude into the accommodating cavity, which minimizes the space occupied by the pole 15 in the accommodating cavity, improves the utilization rate of the internal space of the single cell 10, and is further conducive to improving the energy density of the single cell 10.

[0042] The hole wall of the hole section of the pole hole 13 close to the electrode assembly 14 has a first mating surface 131, and the hole section of the pole hole 13 away from the electrode assembly 14 is a straight hole. The end of the main body 152 close to the mating portion 153 is penetrated in the hole section of the pole hole 13 away from the electrode assembly 14, and the rest of the main body 152 extends to the outside of the single battery 10.

[0043] In one embodiment, the single cell 10 further includes an insulating member 16. At least a portion of the insulating member 16 is disposed between the pole 15 and the top cover 12 to achieve insulation and sealing between the pole 15 and the top cover 12. Further, at least a portion of the insulating member 16 is located on a side of the top cover 12 facing away from the electrode assembly 14, and at least a portion of the insulating member 16 cooperates with the second mating surface 151 of the pole 15 to clamp the top cover 12, so as to achieve fixing of the pole 15 to the top cover 12.

[0044] Specifically, the insulating member 16 includes a first insulating portion 161 and a second insulating portion 162. The first insulating portion 161 is arranged around the outer periphery of the main body 152. At least part of the first insulating portion 161 is located on the side of the top cover 12 facing away from the electrode assembly 14. The first insulating portion 161 and the matching portion 153 cooperate to limit the relative position of the pole 15 and the top cover 12 in the first direction Z. Specifically, the first insulating portion 161 and the matching portion 153 cooperate to clamp the top cover 12 to achieve the fixing of the pole 15 to the top cover 12. The second insulating portion 162 is arranged between the first matching surface 131 and the second matching surface 151. The second insulating portion 162 seals the gap between the first matching surface 131 and the second matching surface 151 to achieve insulation and sealing between the pole 15 and the top cover 12.

[0045] For example, the first insulating portion 161 and the second insulating portion 162 may be an integral injection molded structure. For example, the pole 15 and the top cover 12 are chemically treated to form many nano-scale micropores on the surface of the pole 15 and the top cover 12; after the pole 15 is assembled on the top cover 12, the injection-molded plastic is filled between the pole 15 and the top cover 12, and the plastic is filled into the nano-micropores on the surface of the pole 15 and the top cover 12, thereby ensuring the insulation and sealing effect between the plastic and the pole 15 and between the plastic and the top cover 12, eliminating the sealing ring used in the traditional top cover, which is conducive to simplifying the structure of the single battery 10.

[0046] A lower plastic part independent of the insulating part 16 can also be provided on the lower surface of the top cover 12 after the insulating part 16 is injected as required, and the lower plastic part is used to separate the top cover 12 and the electrode assembly 14. A boss can be provided on the side of the lower plastic part facing the electrode assembly 14 as required to limit the electrode assembly 14.

[0047] Please also read Figure 7 and Figure 8 , Figure 7 is a schematic structural diagram of an embodiment of the top cover of the present application, Figure 8 It is a structural schematic diagram of an embodiment of a pole of the present application.

[0048] In one embodiment, the included angle between the first mating surface 131 and the second direction X is θ1, and the included angle between the second mating surface 151 and the second direction X is θ2, satisfying: θ1 ≥ θ2. Through the above-mentioned method, when θ1=θ2, that is, the first mating surface 131 and the second mating surface 151 are parallel to each other, at this time, not only the cooperation between the first mating surface 131 and the second mating surface 151 can reliably limit the pole 15 from slipping outward, but also in the process of injection molding the insulating member 16, it is ensured that the plastic can efficiently fill the gap between the first mating surface 131 and the second mating surface 151, which is beneficial to ensure the airtightness between the pole 15 and the top cover 12, and further beneficial to improve the production yield of the single battery 10; when θ1>θ2, considering that the injection molding process is to inject plastic from top to bottom, at this time, the inlet of the gap between the first mating surface 131 and the second mating surface 151 is larger, which is more conducive to the plastic efficiently filling the gap between the first mating surface 131 and the second mating surface 151, further reducing the difficulty of the injection molding process, so as to ensure the airtightness between the pole 15 and the top cover 12, and beneficial to improve the production yield of the single battery 10.

[0049] The angle θ1 between the first mating surface 131 and the second direction X also satisfies: 10°≤θ1≤90°, preferably 30°≤θ1≤60°. For example, θ1 can be 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84° Any value among 0°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89°, 90°, etc. In this way, this embodiment can not only ensure that the first mating surface 131 and the second mating surface 151 reliably restrict the pole 15 from coming outward by reasonably setting the angle between the first mating surface 131 and the second direction X, but also facilitate the plastic to efficiently fill the gap between the first mating surface 131 and the second mating surface 151, which is beneficial to ensure the airtightness between the pole 15 and the top cover 12.

[0050] The angle θ2 between the second mating surface 151 and the second direction X also satisfies: 10°≤θ2≤90°, preferably 30°≤θ2≤60°. For example, θ2 can be 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84° Any value among 0°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89°, 90°, etc. In this way, this embodiment can not only ensure that the first mating surface 131 and the second mating surface 151 reliably restrict the pole 15 from slipping outward by reasonably setting the angle between the second mating surface 151 and the second direction X, but also facilitate the plastic to efficiently fill the gap between the first mating surface 131 and the second mating surface 151, which is beneficial to ensure the airtightness between the pole 15 and the top cover 12.

[0051] Furthermore, the angle θ1 between the first mating surface 131 and the second direction X and the angle θ2 between the second mating surface 151 and the second direction X also satisfy: 0.6<θ2 / θ1≤1. For example, θ2 / θ1 can be any value among 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, etc.

[0052] Through the above method, this embodiment further ensures that the first mating surface 131 and the second mating surface 151 can reliably restrict the pole 15 from coming out, and further ensures that the plastic efficiently fills the gap between the first mating surface 131 and the second mating surface 151, by reasonably setting the angle between the first mating surface 131 and the second direction X and the angle between the second mating surface 151 and the second direction X, which is beneficial to ensure the airtightness between the pole 15 and the top cover 12.

[0053] In one embodiment, the minimum aperture of the terminal post hole 13 is D1, and the maximum dimension of the mating portion 153 in the second direction X is D2, satisfying: 0.5 < D1 / D2 < 1. For example, D1 / D2 can be any value among 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, etc.

[0054] By the above method, in this embodiment, by reasonably setting the dimensions of the terminal post 15 and the terminal post hole 13, it can not only ensure that the first mating surface 131 and the second mating surface 151 reliably limit the outward脱出 of the terminal post 15, but also ensure that the plastic efficiently fills the gap between the first mating surface 131 and the second mating surface 151 when the insulating part 16 is formed by injection molding, reducing the difficulty of the injection molding process and being beneficial to ensuring the airtightness between the terminal post 15 and the top cover 12.

[0055] In one embodiment, the angle θ1 between the first mating surface 131 and the second direction X, the angle θ2 between the second mating surface 151 and the second direction X, the minimum aperture D1 of the terminal post hole 13, and the maximum dimension D2 of the mating portion 153 in the second direction X also satisfy: Preferably For example, It can be any value among 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, etc.

[0056] It should be noted that the text seems to have some unclear or incorrect expressions in places like "outward脱出", which might need to be further clarified in the original Chinese text for a more accurate translation.In the above manner, this embodiment can not only ensure that the first mating surface 131 and the second mating surface 151 reliably limit the pole column 15 from protruding outwards, but also ensure that when the insulating part 16 is formed by injection molding, the plastic can efficiently fill the gap between the first mating surface 131 and the second mating surface 151, reducing the difficulty of the injection molding process and being beneficial to ensuring the airtightness between the pole column 15 and the top cover 12.

[0057] The following combines specific embodiments to evaluate the performance of the technical solutions provided by the embodiments of the present application.

[0058] Embodiments 1 to 11 are provided. Embodiments 1 to 7 and embodiments 9 to 10 satisfy 0.5 < D1 / D2 < 1, and embodiment 8 does not satisfy 0.5 < D1 / D2 < 1. Embodiments 1 to 8 satisfy 0.6 < θ2 / θ1 ≤ 1, and embodiments 9 and 10 do not satisfy 0.6 < θ2 / θ1 ≤ 1. Embodiments 1 to 7 satisfy Embodiments 8 to 10 do not satisfy In embodiment 11, it is set that D1 > D2. The specific parameters and test results are shown in Table 1.

[0059] Table 1

[0060]

[0061] Among them, the tensile strength parameter in Table 1 characterizes the reliability of restricting the pole column 15 from protruding outwards. The minimum tensile force required to pull the pole column 15 off the top cover 12 is tested by a tensile testing machine, and this minimum tensile force is the tensile strength parameter. The airtightness yield parameter in Table 1 characterizes the proportion of the top covers 12 with good airtightness in a batch of top covers 12. The specific test method can be: use a fixture to seal the peripheral area of the pole column 15 on the top cover 12, put it into a helium detector, fill helium at the bottom of the instrument, and detect whether there is helium leakage at the upper part to determine the airtightness between the pole column 15 and the top cover 12; the number of top covers 12 for testing can be 100, etc., and the airtightness yield is counted.

[0062] It can be seen that the above embodiments 1 to 10 all have good tensile strength and airtightness yield. In particular, when 0.5 < D1 / D2 < 1 is satisfied, or 0.6 < θ2 / θ1 ≤ 1 is satisfied, or is satisfied, the tensile strength parameter and the airtightness yield parameter are further balanced. In embodiment 11, since it is set that D1 > D2, at this time the top cover 12 cannot reliably limit the pole column 15, and the pole column 15 is relatively easy to be pulled off the top cover 12.

[0063] In summary, the present application provides a single cell and a battery pack. The hole wall of the pole hole on the top cover has a first mating surface, the first mating surface is inclined relative to the first direction, and the first mating surface faces the electrode assembly. The outer peripheral wall of the pole close to the electrode assembly has a second mating surface, the second mating surface is inclined relative to the first direction, and the second mating surface is away from the electrode assembly. The first mating surface and the second mating surface are arranged opposite to each other. Among them, the first mating surface and the second mating surface are both inclined, not only the first mating surface and the second mating surface can cooperate to limit the pole from escaping outward, but also help to reduce the size of the pole protruding into the accommodating cavity, and avoid the pole occupying the space of the accommodating cavity as much as possible, thereby helping to improve the utilization rate of the internal space of the single cell.

[0064] Furthermore, the second mating surface of the pole is in the pole hole, and the second mating surface does not extend to the outside of the pole hole, which can reduce the influence of the inclined setting of the second mating surface on the structural strength of the pole, thereby facilitating improving the structural strength of the pole.

[0065] The single cell battery and battery pack provided by the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A single cell battery, characterized in that: The single cell has a first direction, and the single cell includes: A housing having an opening at an end along the first direction; A top cover, which is disposed on the opening and is connected to the shell to enclose a receiving cavity, wherein the top cover is provided with a pole hole penetrating along the first direction; an electrode assembly, disposed in the accommodating cavity; and A pole, part of which is passed through the pole hole, and the pole is electrically connected to the electrode assembly; Among them, the hole wall of the pole hole has a first mating surface, the first mating surface is inclined relative to the first direction, and the first mating surface faces the electrode assembly; the outer peripheral wall of the pole close to the electrode assembly has a second mating surface, the second mating surface is inclined relative to the first direction, and the second mating surface is back to the electrode assembly; the first mating surface and the second mating surface are arranged opposite to each other, and the second mating surface is in the pole hole.

2. The single cell according to claim 1, characterized in that: The single cell also has a reference plane parallel to the first direction; The orthographic projection of the second mating surface on the reference plane is located in the orthographic projection of the pole hole on the reference plane.

3. The single cell according to claim 1 or 2, characterized in that: The single cell also has a second direction perpendicular to the first direction; The included angle between the first mating surface and the second direction is θ1, and the included angle between the second mating surface and the second direction is θ2; The pole comprises a main body and a matching part connected to each other, the matching part is located on a side of the main body close to the electrode assembly in the first direction, the size of the matching part in the second direction is larger than the size of the main body in the second direction, and the outer peripheral wall of the matching part has the second matching surface; The minimum hole diameter of the pole hole is D1 mm, and the maximum dimension of the matching portion in the second direction is D2 mm; Among them, it meets:

4. The single cell according to claim 3, characterized in that: θ1 and θ2 satisfy: θ1≥θ2.

5. The single cell according to claim 4, characterized in that: 0.6<θ2 / θ1≤1.

6. The single cell according to claim 3, characterized in that: D1 and D2, satisfying: D1 <D2。 7. The single cell according to claim 6, characterized in that: 0.5 <D1 / D2<1。 8. The single cell according to claim 3, characterized in that: The single cell battery further comprises: An insulating member includes a first insulating portion and a second insulating portion; the first insulating portion is arranged around the outer periphery of the main body, and at least a portion of the first insulating portion is located on the side of the top cover facing away from the electrode assembly, and the first insulating portion cooperates with the matching portion to limit the relative position of the pole and the top cover in the first direction; the second insulating portion is arranged between the first matching surface and the second matching surface.

9. The single cell according to claim 1 or 2, characterized in that: The surface of the pole facing the electrode assembly is located in the pole hole.

10. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 9.

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