Single battery, battery pack and power utilization device

Abstract

The utility model discloses a single battery, a battery pack and an electric device. The single battery comprises a shell, an electrode assembly, a first cover plate and a first collector plate, the first flow collecting disc comprises a connecting piece and an elastic piece; the elastic part comprises a deformation part and a conductive part, the deformation part comprises a first section and a second section which are mutually connected, one end of the first section away from the second section is connected with the connector, the second section is bent relative to the first section, and one end of the second section away from the first section is connected with the conductive part. According to the first current collecting disc, the elastic piece is arranged, so that the battery has tolerance absorption capacity when being sealed, assembled and welded, and the yield loss is reduced; the deformation part of the elastic piece comprises the first section and the second section, and the first section and the second section are bent, so that the deformation capability of the elastic piece can be improved, and the connection between the connecting piece and the electrode assembly cannot be influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a single battery, a battery pack and an electric device. Background Art

[0002] The main way to connect cylindrical batteries is to connect the top cover and the flat collector plate by laser penetration welding or lug side welding. However, laser penetration welding requires high assembly tolerance and leads to large loss of product quality. Lug side welding provides less welding area, which affects the overall welding strength and battery flow area. Utility Model Content

[0003] The purpose of the present application is to provide a single cell, a battery pack and an electrical device. The single cell of the present application can absorb the assembly tolerance during the cylindrical battery sealing assembly welding process through the deformation of the elastic part, thereby improving the product quality rate.

[0004] The present application provides a single battery, including:

[0005] A housing, wherein the housing is provided with a receiving cavity;

[0006] An electrode assembly, wherein the electrode assembly is disposed in the accommodating cavity;

[0007] A first cover plate, the first cover plate is connected to the shell and covers the accommodating cavity, and the first cover plate is provided with a pole;

[0008] a first current collecting plate, the first current collecting plate being disposed in the accommodating cavity and being located between the first cover plate and the electrode assembly;

[0009] The first current collecting plate comprises a connecting member and an elastic member; the connecting member is connected to the elastic member; and a side of the connecting member away from the elastic member is connected to the electrode assembly;

[0010] The elastic member includes a deformation part and a conductive part, wherein the conductive part is located between the deformation part and the pole and is respectively connected to the deformation part and the pole; the deformation part includes a first section and a second section connected to each other, an end of the first section away from the second section is connected to the connecting member, and the second section is bent relative to the first section and an end of the second section away from the first section is connected to the conductive part.

[0011] In some embodiments, the conductive portion includes a protrusion, the protrusion faces the first cover plate and is connected to the pole;

[0012] There are multiple deformation parts, and the multiple deformation parts are arranged around the protrusion.

[0013] In some embodiments, the connecting member has a first surface and a second surface opposite to each other along a thickness direction, and the connecting member has a spaced area, and the spaced area penetrates the first surface and the second surface along the thickness direction;

[0014] At least a portion of the first section is located in the spaced area, one end of the first section away from the second section is connected to the inner wall of the connecting member, and one end of the second section away from the first section is connected to the protrusion.

[0015] In some embodiments, the first section has a third surface and a fourth surface arranged opposite to each other along the thickness direction; the third surface is connected to the first surface and the third surface and the first surface are located in the same plane; the fourth surface is connected to the second surface and the fourth surface and the second surface are located in the same plane.

[0016] In some embodiments, the second section has a fifth surface and a sixth surface arranged opposite to each other along the thickness direction, the fifth surface is connected to the third surface, the sixth surface is connected to the fourth surface, and an angle α is formed between the third surface and the fifth surface, satisfying: 90°<α<180°.

[0017] In some embodiments, the second surface has a plurality of welding areas arranged around the protrusion, the first section separates the plurality of welding areas from each other, and the electrode assembly is used to be connected to the welding areas.

[0018] In some embodiments, the conductive portion further includes a connecting plate; the connecting plate is located between the deformation portion and the protrusion, and is respectively connected to the deformation portion and the protrusion.

[0019] In some embodiments, the connecting member has a first surface and a second surface opposite to each other in a thickness direction, and the connecting member has a first through hole, and the first through hole penetrates the first surface and the second surface in the thickness direction;

[0020] A plurality of the deformation portions are arranged around the first through hole and are spaced apart from each other; and the orthographic projection of the protrusion along the thickness direction is located in the first through hole.

[0021] In some embodiments, one end of the first segment away from the second segment is connected to the first surface or to the inner wall of the connecting member; one end of the second segment away from the first segment is connected to the connecting plate; the first segment and / or the second segment can be displaced in the thickness direction relative to the connecting member.

[0022] In some embodiments, the present application also provides a battery pack, including a box body and the above-mentioned single battery, wherein the single battery is arranged in the box body.

[0023] In some embodiments, the present application also provides an electrical device, including the single cell battery, wherein the single cell battery is used to supply power to the electrical device; or, including the battery pack, wherein the battery pack is used to supply power to the electrical device.

[0024] The beneficial effects of the present application are as follows: a single cell battery of the present application comprises: a shell, the shell is provided with a accommodating cavity; an electrode assembly, the electrode assembly is arranged in the accommodating cavity; a first cover plate, the first cover plate is connected to the shell and covers the accommodating cavity, and the first cover plate is provided with a pole; a first current collecting disk, the first current collecting disk is arranged in the accommodating cavity and is located between the first cover plate and the electrode assembly; the first current collecting disk comprises a connecting member and an elastic member; the connecting member is connected to the elastic member; the side of the connecting member away from the elastic member is connected to the electrode assembly; the elastic member comprises a deformation part and a conductive part, the conductive part is located between the deformation part and the pole and is respectively connected to the deformation part and the pole; the deformation part comprises a first section and a second section connected to each other, the end of the first section away from the second section is connected to the connecting member, the second section is bent relative to the first section and the end of the second section away from the first section is connected to the conductive part. The first current collecting disk of the present application can have the tolerance absorption capability when the battery is sealed and assembled and welded by setting an elastic member, thereby reducing the yield loss; the deformation portion of the elastic member includes a first section and a second section, and there is a bend between the first section and the second section, which can not only improve the deformation capability of the elastic member but also not affect the connection between the connector and the electrode assembly. The electrode assembly can maintain a high degree of fit with the connector, further ensuring the overall welding strength and the battery flow area, thereby improving the yield of battery preparation.

[0025] It should be noted that the battery pack and the electrical device of the embodiments of the present application may include all the technical features and beneficial effects of the above-mentioned single battery, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the structure of a single cell in an embodiment of the present application;

[0028] Figure 2 is a schematic cross-sectional view of a single cell in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the three-dimensional structure of a first current collecting plate provided in an embodiment of the present application;

[0030] Figure 4 for Figure 3 A front view of a first current collecting plate provided in;

[0031] Figure 5 for Figure 3 A top view of a first current collecting plate provided in;

[0032] Figure 6 A schematic diagram of the three-dimensional structure of another first current collecting plate provided in an embodiment of the present application;

[0033] Figure 7 for Figure 6 A front view of a first current collecting plate provided in;

[0034] Figure 8 is a cross-sectional view of another first current collecting disc;

[0035] Fig. 9 This is a schematic diagram of a three-dimensional structure of another first current collecting plate provided in an embodiment of the present application;

[0036] Fig.10 for Fig. 9 A cross-sectional view of a first current collecting plate provided in;

[0037] Figure markings: 1-shell, 2-electrode assembly, 3-first cover plate, 4-first current collecting disk, 5-second current collecting disk, 6-second cover plate, 7-seal, 101-accommodating chamber, 31-pole, 41-connecting member, 42-elastic member, 411-first surface, 412-second surface, 413-isolation area, 414-first through hole, 421-deformation portion, 422-conductive portion, 4121-welding area, 4211-first section, 4212-second section, 4213-seventh surface, 4214-eighth surface, 4215-second through hole, 4221-protrusion, 4222-connecting plate, 42111-third surface, 42112-fourth surface, 42121-fifth surface, 42122-sixth surface. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments 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 creative work are within the scope of protection of the present application. In addition, in the description of the present application, the term "including" means "including but not limited to". The terms first, second, third, etc. are used only as labels, and no numerical requirements are imposed or order is established. Various embodiments of the present application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and simplicity, and should not be understood as a hard limit to the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values ​​within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the numbered range, such as 1, 2, 3, 4, 5 and 6, which are applicable regardless of the range. Additionally, whenever a numerical range is indicated herein, it is meant to include any cited numeral (fractional or integral) within the indicated range.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] Currently, cylindrical batteries are a research hotspot. Compared with square batteries, the shape and method of the positive and negative pole electrical connections of cylindrical batteries have undergone relatively large changes, mainly including the process of flattening the tabs, welding the collector plates, and electrically connecting the collector plates to the shell. Among them, the mainstream electrical connection of cylindrical batteries adopts laser penetration welding or lug side welding between the top cover and the flat sheet collector plate. However, these conventional electrical connection methods have their own defects: the laser penetration welding method has high requirements on assembly tolerance and large loss of quality; the lug side welding method can provide less welding area, affecting the overall welding strength and battery flow area.

[0044] Based on this, it is one of the current research focuses in the field of cylindrical batteries to provide an electrical connection method that can absorb assembly tolerances and ensure overall welding strength and battery flow area.

[0045] See also Figure 1 , Figure 2 and Figure 3The present embodiment provides a single battery, comprising: a housing 1, an electrode assembly 2, a first cover plate 3 and a first current collecting plate 4; the housing 1 is provided with a receiving cavity 101; the electrode assembly 2 is arranged in the receiving cavity 101; the first cover plate 3 is connected to the housing 1 and covers the receiving cavity 101, and the first cover plate 3 is provided with a pole 31; the first current collecting plate 4 is arranged in the receiving cavity 101 and is located between the first cover plate 3 and the electrode assembly 2; wherein the first current collecting plate 4 comprises a connecting member 41 and an elastic member 42; the connecting member 41 is connected to the elastic member 42; the side of the connecting member 41 away from the elastic member 42 is connected to the electrode assembly 2; the elastic member 42 is used The elastic member 42 generates elastic deformation between the connecting member 41 and the first cover plate 3; the elastic member 42 includes a deformation portion 421 and a conductive portion 422, the deformation portion 421 is connected to the connecting member 41, and the conductive portion 422 is located between the deformation portion 421 and the pole 31 and is respectively connected to the deformation portion 421 and the pole 31; the deformation portion 421 includes a first section 4211 and a second section 4212 connected to each other, an end of the first section 4211 away from the second section 4212 is connected to the connecting member 41, the second section 4212 is bent relative to the first section 4211 and an end of the second section 4212 away from the first section 4211 is connected to the conductive portion 422.

[0046] It is understandable that the deformation portion 421 of the elastic member 42 can produce elastic deformation between the connector 41 and the first cover plate 3, which can bear the pressure generated by the battery during the welding assembly process, absorb the expansion and contraction caused by the assembly tolerance during the welding process, reduce the influence of stress, reduce the loss of superior rate, and improve the welding yield, thereby further improving the stability and life of the battery. In addition, the conductive portion 422 of the elastic member 42 is located between the deformation portion 421 and the pole 31, and is connected to them respectively, which can ensure that the current flows from the electrode assembly 2 through the connector 41 and the conductive portion 422, and finally outputs through the pole 31. The conductive portion 422 can provide good conductivity and current distribution, thereby improving the efficiency and performance of the battery. The connection between the connector 41 and the elastic member 42 can also provide support for the inside of the battery. The connection between them and the housing 1, the electrode assembly 2 and the first cover plate 3 can enhance the structural stability of the battery, help reduce the impact of vibration and external stress on the battery, and maintain the normal operation of the battery. In addition, there is a bend between the first section 4211 and the second section 4212, which can not only improve the deformation ability of the elastic member 42 but also does not affect the connection between the connector 41 and the electrode assembly 2, so that the electrode assembly 2 can maintain a high degree of fit with the connector 41, further ensuring the overall welding strength and the battery flow area, and improving the yield of battery preparation.

[0047] In some embodiments, see further Figure 1, the single cell further includes a second current collecting plate 5, a second cover plate 6 and a sealing member 7, wherein the second cover plate 6 is connected to the shell 1 and covers the accommodating cavity 101, and the second cover plate 6 and the first cover plate 3 are respectively located at both ends of the shell 1, the second current collecting plate 5 is arranged in the accommodating cavity 101, located between the second cover plate 6 and the electrode assembly 2, and respectively connected to the electrode assembly 2 and the second cover plate 6, and the sealing member 7 is arranged on the second cover plate 6 for sealing the second cover plate 6. It can be understood that the single cell is a cylindrical battery, and the specific installation process is: firstly place the electrode assembly 2 in the accommodating cavity 101 of the shell 1, and then place the first current collecting plate 4 between the electrode assembly 2 and the first cover plate 3, ensuring that it is connected to the respective pole ears and pole column parts; next place the second current collecting plate 5 between the electrode assembly 2 and the second cover plate 6, ensuring that it is connected to the respective pole ears and pole columns on the shell; finally install the sealing member 7 on the second cover plate 6 to ensure that the second cover plate 6 is sealed. For cylindrical batteries, usually the first current collector 4 is the positive electrode collector, the pole 31 on the first cover plate 3 is the positive pole, and the second current collector 5 is the negative electrode collector, which is directly connected to the second cover plate 6; the pole of the negative electrode (usually the shell 1) is connected to the external negative electrode, and the pole of the positive electrode is connected to the external positive electrode, so that the current can smoothly enter or leave the battery from the inside of the battery through the pole. When the battery is installed, it can be placed in an appropriate device as needed. When the battery needs to be used, the electrode assembly 2 is supplied with an appropriate current, and the battery starts to work, converting chemical energy into electrical energy, and monitoring the performance and temperature of the battery during use, and maintaining appropriate use and charging conditions to ensure the normal operation and safety of the battery.

[0048] In some embodiments, see further Figure 3 , Figure 4 and Figure 5 , the conductive part 422 includes a protrusion 4221, and the protrusion 4221 faces the first cover plate 3 and is connected to the pole 31; there are multiple deformation parts 421, and multiple deformation parts 421 are arranged around the protrusion 4221. It should be noted that the protrusion 4221 can provide a better contact area and connection strength, ensuring good current conduction performance. The multiple settings of the deformation part 421 and the arrangement around the protrusion 4221 help to improve the adaptability of the battery. When the battery is subjected to external stress or deformation, the deformation part 421 can bend or stretch, thereby reducing the stress inside the battery and maintaining the normal working state of the battery. By surrounding the deformation part 421 around the protrusion 4221, a more evenly distributed deformation and stress sharing can be achieved, thereby reducing the risk of local stress concentration.

[0049] In some embodiments, see further Figure 3 , Figure 4 and Figure 5The connecting member 41 has a first surface 411 and a second surface 412 opposite to each other in the thickness direction, and has a spacer 413 that penetrates the first surface 411 and the second surface 412 in the thickness direction; at least part of the first section 4211 is located in the spacer 413, and one end of the first section 4211 away from the second section 4212 is connected to the inner wall of the connecting member 41, and one end of the second section 4212 away from the first section 4211 is connected to the protrusion 4221. The thickness direction is Figure 3 The arrow x indicates the direction.

[0050] Understandably, Figure 3 The deformation part 421 in the figure is in the shape of a tentacle, wherein the first section 4211 and the second section 4212 are elastic spokes, and the first section 4211 and the second section 4212 can be connected in an integral manner or in a split manner. The material of the elastic spokes can be light and strong spring steel, carbon steel, aluminum alloy, etc., which can provide good elasticity, thereby absorbing the assembly tolerance. Among them, a spacer area 413 is further provided on the connector 41. When the deformation part 421 needs to deform to absorb the tolerance, the first section located in the spacer area 413 is connected to the inner wall of the connector 41 without causing excessive stress to the welding area and the electrode assembly, and the weld mark in the welding area is not subjected to stress pulling, thereby providing a welding yield. In addition, the deformation part 421 is also conductive and can be connected and matched with the conductive part 422 to realize current transfer. The spacer area 413 can also be used as an injection hole to facilitate the injection of electrolyte into the housing 1.

[0051] In some embodiments, the deformation portion 421 can be a multi-segment structure, where the multi-segment structure refers to a structure with more than or equal to two segments. Therefore, the deformation portion 421 is not limited to including the first segment 4211 and the second segment 4212, but can also include more line segment structures, and the multiple line segment structures only need to satisfy that at least one of them is bent and can be deformed.

[0052] In some embodiments, see further Figure 3-5 The first section 4211 has a third surface 42111 and a fourth surface 42112 that are arranged opposite to each other in the thickness direction; the third surface 42111 is connected to the first surface 411 and the third surface 42111 and the first surface 411 are located in the same plane; the fourth surface 42112 is connected to the second surface 412 and the fourth surface 42112 and the second surface 412 are located in the same plane. Figure 3 The direction indicated by the arrow x.

[0053] It is understandable that when the first section 4211 is located in the air space 413, the surface of the first section 4211 is parallel to the first surface 411 and the second surface 412, respectively. Parallelism here means completely parallel or almost completely parallel, as long as it is within the 5° range of complete parallelism. This makes the conductive portion 422 and the second section 4212 arched when the first collector plate 4 is laid flat, which can serve as a structural basis for providing elastic deformation absorption tolerance during battery assembly. In addition, the structural basis can also ensure the stability of welding the connector 41 to the electrode assembly 2.

[0054] In some embodiments, see further Figure 4 The second section 4212 has a fifth surface 42121 and a sixth surface 42122 that are arranged opposite to each other in the thickness direction, the fifth surface 42121 is connected to the third surface 42111, the sixth surface 42122 is connected to the fourth surface 42112, and an angle α is formed between the third surface 42111 and the fifth surface 42121, satisfying: 90°<α<180°. For example, the angle α can be any one of 110°, 120°, 130°, 140°, 150°, 160°, 170°, or a range between any two values. When the angle α between the first section 4211 and the second section 4212 satisfies the above range, the first section 4211 and the second section 4212 are at an obtuse angle, which can disperse the concentration of the stress points of the spokes, thereby reducing the concentration of stress, helping to balance the stress distribution between the spokes, and helping to increase the strength and durability of the spoke connections, and reduce the risk of fatigue and fracture; the obtuse angle connection between the first section 4211 and the second section 4212 can also increase the flexibility of the overall structure and improve the deformation capacity to adapt to different external forces.

[0055] In some embodiments, the number of the deformation parts 421 can be adjusted according to the actual material used and the specific absorption tolerance requirements, including but not limited to Figure 3 The number of the deformable parts 421 is set to 5. Figure 5 From a top-down perspective, the overall shape of the deformation portion 421 includes but is not limited to a straight line, a serpentine, an arc, a broken line, etc.

[0056] In some embodiments, see further Figure 5 The second surface 412 has a plurality of welding areas 4121 arranged around the conductive portion 422, and the first section 4211 separates the plurality of welding areas 4121 from each other; the electrode assembly 2 is connected to the welding area 4121. It can be understood that the welding area 4121 is Figure 5The triangular area in the middle can ensure that the connector 41 has enough space to be welded to the ear of the electrode assembly 2 by setting the welding area 4121, so as to achieve large-area welding and increase the flow path. The welding methods include penetration welding, torque welding, resistance welding, etc. The welding area 4121 can maintain a high degree of fit with the end face of the ear of the electrode assembly 2 without affecting each other, thereby achieving flow.

[0057] In some embodiments, see further Figure 6 and Figure 7 , another structure of the elastic member 42 is provided, wherein the conductive portion 422 further includes a connecting plate 4222, the connecting plate 4222 is located between the deformation portion 421 and the protrusion 4221 and respectively connects the deformation portion 421 and the protrusion 4221. The connecting plate 4222 can serve as a transition structure between the protrusion 4221 and the deformation portion 421, can improve the overall stability of the elastic member 42, and can also improve the flow capacity by increasing the contact area connected to each other.

[0058] In some embodiments, see Figure 7 The deformation part 421 is an integral structure, and is made of conductive flexible material; the conductive flexible material is a material that is both conductive and elastic, and can be specifically selected from conductive structural glue, conductive rubber, conductive sheets made of beryllium copper or nickel copper, etc.; composite materials made of conductive fillers such as metal particles, carbon nanotubes, graphene, carbon black, etc. doped in flexible materials such as silicone and polyurethane can also be used. Conductive flexible material is directly used as the deformation part 421, and it has high flexibility and elasticity and can withstand deformation and strain; the conductive flexible material can also be designed to be thinner and lighter, thereby reducing the volume occupied inside the battery, making the overall weight of the battery lighter. The conductive flexible material can also adapt to various shapes, curves and changing surfaces, so that the overall structure can be combined with connectors 41 and connectors 423 of different shapes and sizes.

[0059] In some embodiments, see further Figure 8The connecting member 41 has a first surface 411 and a second surface 412 that are opposite to each other along the thickness direction, and the connecting member 41 has a first through hole 414, and the first through hole 414 penetrates the first surface 411 and the second surface 412 along the thickness direction; the deformation portion 421 has a seventh surface 4213 and an eighth surface 4214 that are opposite to each other along the thickness direction, and the deformation portion 421 has a second through hole 4215, and the second through hole 4215 penetrates the seventh surface 4213 and the eighth surface 4214 along the thickness direction; the seventh surface 4213 is connected to the connecting plate 4222, and the eighth surface 4214 is connected to the first surface 411; the first through hole 414 and the second through hole 4215 are connected along the thickness direction, and the orthographic projection of the protrusion 4221 along the thickness direction is located in the first through hole 414. The first through hole 414 and the second through hole 4215 are respectively provided at the corresponding positions of the connecting member 41 and the deforming portion 421. At this time, the connecting member 41 and the deforming portion 421 are annular structures, which can further reduce the mass of the first current collecting plate 4, facilitate its preparation and reduce the preparation cost. In addition, a through hole can also be provided in the connecting plate 4222, and is connected to the first through hole 414 and the second through hole 4215 to facilitate the injection of electrolyte into the housing 1.

[0060] In some embodiments, see further Fig. 9 and Fig.10 The connector 41 has a first surface 411 and a second surface 412 that are opposite to each other in the thickness direction, and the connector 41 has a first through hole 414 that penetrates the first surface 411 and the second surface 412 in the thickness direction; there are multiple deformable parts 421, and the multiple deformable parts 421 are arranged around the first through hole 414 and are spaced apart from each other, and there is a gap between the spaced-apart deformable parts 421, and the gap is connected to the first through hole 414, which can facilitate the injection of electrolyte into the housing 1; the positive projection of the conductive part 422 in the thickness direction is located in the first through hole 414. Among them, one end of the first section 4211 away from the second section 4212 is connected to the first surface 411 or the inner wall of the connector 41; one end of the second section 4212 away from the first section 4211 is connected to the connecting plate 4222; at least one of the first section 4211 and the second section 4212 can be displaced in the thickness direction relative to the connector 41.

[0061] It can be understood that the deformation part 421 is a plurality of foldable structures; wherein the first section 4211 and the second section 4212 circumferentially surround the first through hole 414 and are made of metal; during the assembly process, the first section 4211 and the second section 4212 move relative to each other to achieve the expansion and contraction of the deformation part 421 to absorb the assembly tolerance. Fig. 9In the structure, the first through hole 414 is also provided on the connecting member 41. In addition to reducing the mass of the first collecting plate 4, the first through hole 414 can also facilitate the removal of debris generated during welding from the first through hole 414 to avoid short circuit of the electrode assembly 2.

[0062] In some embodiments, Figure 3 , Figure 6 and Fig. 9 As shown, the protrusion 4221 adopts a planar terminal, a grooved terminal and other structures, including but not limited to a circular, equilateral or unequal-sided polygon and other shapes.

[0063] In some embodiments, a battery pack is also provided, including a box body and the above-mentioned single cell battery, wherein the single cell battery is disposed in the box body, and a plurality of single cells are provided, and the plurality of single cells are arranged in the box body.

[0064] In some embodiments, an electric device is also provided, including a single cell battery, which is used to power the electric device; or, including a battery pack, which is used to power the electric device. Among them, the electric 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, 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 embodiment of the present application does not impose any special restrictions on the above-mentioned electric devices.

[0065] In some embodiments, an elastic member 42 is provided on the first current collecting disk 4 so as to have the ability to absorb tolerances during sealing assembly welding, thereby reducing quality loss; the welding areas on the first current collecting disk 4 are relatively independent of each other, and during welding, they can each maintain a high degree of fit with the end faces of the pole ears of the electrode assembly 2 without affecting each other, thereby improving the welding quality.

[0066] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] The above is a detailed introduction to a single cell battery, a battery pack and an electrical device provided in the embodiments of the present application. Specific examples are used herein 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 technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods 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: include: A housing (1), wherein the housing (1) is provided with a receiving cavity (101); An electrode assembly (2), the electrode assembly (2) being arranged in the accommodating cavity (101); a first cover plate (3), the first cover plate (3) being connected to the housing (1) and covering the accommodating cavity (101), the first cover plate (3) being provided with a pole (31); A first current collecting plate (4), the first current collecting plate (4) being arranged in the accommodating cavity (101) and located between the first cover plate (3) and the electrode assembly (2); The first current collecting plate (4) comprises a connecting member (41) and an elastic member (42); the connecting member (41) is connected to the elastic member (42); a side of the connecting member (41) away from the elastic member (42) is connected to the electrode assembly (2); The elastic member (42) comprises a deformation portion (421) and a conductive portion (422), wherein the conductive portion (422) is located between the deformation portion (421) and the pole (31) and is respectively connected to the deformation portion (421) and the pole (31); the deformation portion (421) comprises a first section (4211) and a second section (4212) which are connected to each other, wherein an end of the first section (4211) away from the second section (4212) is connected to the connecting member (41), and the second section (4212) is bent relative to the first section (4211) and an end of the second section (4212) away from the first section (4211) is connected to the conductive portion (422).

2. The single cell according to claim 1, characterized in that: The conductive portion (422) comprises a protrusion (4221), wherein the protrusion (4221) faces the first cover plate (3) and is connected to the pole (31); There are multiple deformation parts (421), and the multiple deformation parts (421) are arranged around the protrusion (4221).

3. The single cell according to claim 2, characterized in that: The connecting member (41) has a first surface (411) and a second surface (412) opposite to each other in the thickness direction, and the connecting member (41) has a spacer area (413), and the spacer area (413) penetrates the first surface (411) and the second surface (412) in the thickness direction; At least a portion of the first section (4211) is located in the spaced-apart area (413), one end of the first section (4211) away from the second section (4212) is connected to the inner wall of the connecting member (41), and one end of the second section (4212) away from the first section (4211) is connected to the protrusion (4221).

4. The single cell according to claim 3, characterized in that: The first section (4211) has a third surface (42111) and a fourth surface (42112) arranged opposite to each other along the thickness direction; the third surface (42111) and the first surface (411) are connected, and the third surface (42111) and the first surface (411) are located in the same plane; the fourth surface (42112) and the second surface (412) are connected, and the fourth surface (42112) and the second surface (412) are located in the same plane.

5. The single cell according to claim 4, characterized in that: The second section (4212) has a fifth surface (42121) and a sixth surface (42122) which are arranged opposite to each other along the thickness direction, the fifth surface (42121) is connected to the third surface (42111), the sixth surface (42122) is connected to the fourth surface (42112), and an angle α is provided between the third surface (42111) and the fifth surface (42121), satisfying: 90°<α<180°.

6. The single cell according to claim 3, characterized in that: The second surface (412) has a plurality of welding areas (4121) arranged around the protrusion, the first section (4211) separates the plurality of welding areas (4121) from each other, and the electrode assembly (2) is used to be connected to the welding areas (4121).

7. The single cell according to claim 2, characterized in that: The conductive portion (422) further comprises a connecting plate (4222); the connecting plate (4222) is located between the deformable portion (421) and the protrusion (4221), and is respectively connected to the deformable portion (421) and the protrusion (4221).

8. The single cell according to claim 7, characterized in that: The connecting member (41) has a first surface (411) and a second surface (412) opposite to each other in a thickness direction, and the connecting member (41) has a first through hole (414), and the first through hole (414) penetrates the first surface (411) and the second surface (412) in the thickness direction; A plurality of the deformation portions (421) are arranged around the first through hole (414) and are spaced apart from each other; and the orthographic projection of the protrusion (4221) along the thickness direction is located in the first through hole (414).

9. The single cell according to claim 8, characterized in that: One end of the first section (4211) away from the second section (4212) is connected to the first surface (411) or to the inner wall of the connecting member (41); one end of the second section (4212) away from the first section (4211) is connected to the connecting plate (4222); the first section (4211) and / or the second section (4212) can be displaced in the thickness direction relative to the connecting member (41).

10. A battery pack, characterized in that: The invention comprises a box body and a single cell according to any one of claims 1 to 9, wherein the single cell is arranged in the box body.

11. An electrical device, characterized in that: The method comprises a single cell battery as claimed in any one of claims 1 to 9, wherein the single cell battery is used to supply power to the electrical device; or comprises a battery pack as claimed in claim 10, wherein the battery pack is used to supply power to the electrical device.

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