Single battery and electric device

Abstract

The utility model discloses a single battery and a power utilization device, relates to the technical field of batteries, and aims to solve the problems that rigid tearing occurs between two sides of an existing collector plate and an electrode assembly and between the two sides of the existing collector plate and a top cover assembly, and the connection part of the collector plate and the top cover assembly is fractured seriously; therefore, the problem of electric connection failure or short service life of the single battery is solved. The single battery provided by the utility model comprises a shell, wherein the shell is provided with an opening end; the electrode assembly is arranged in the shell; the top cover assembly covers the opening end; the first current collecting disc is installed between the electrode assembly and the top cover assembly, the second connecting part and the first connecting part of the first current collecting disc are staggered in the first direction, and the elastic connecting part of the first current collecting disc is connected with the first connecting part and the second connecting part and inclines from the first connecting part to the second connecting part; one of the first connecting part and the second connecting part is connected with the top cover assembly, the other one of the first connecting part and the second connecting part is connected with the electrode assembly, and a plurality of through holes distributed at intervals in the circumferential direction of the first current collecting disc are formed in the first current collecting disc.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly relates to a single cell and an electrical device using the same. Background Art

[0002] Currently, a single cell generally consists of structures such as a housing, an electrode assembly, a current collector plate, and a top cover assembly. Among them, the housing is used to accommodate the electrode assembly and the current collector plate, the top cover assembly is covered on the opening side of the housing to seal the housing, and both sides of the current collector plate are respectively connected to the electrode assembly and the top cover assembly.

[0003] Among them, since both sides of the current collector plate are respectively connected to the electrode assembly and the top cover assembly. Therefore, when the single cell is in a working condition of long-term shaking and vibration, rigid tearing will occur between both sides of the current collector plate and the electrode assembly and the top cover assembly, which will cause the connection between the current collector plate and the tab in the electrode assembly to break. In severe cases, the connection between the current collector plate and the top cover assembly will even break, resulting in electrical connection failure or low service life of the single cell. Utility Model Content

[0004] The present application provides a single cell and an electrical device using the same, which can solve the technical problem that rigid tearing occurs between both sides of the existing current collector plate and the electrode assembly and the top cover assembly, resulting in the breakage of the connection between the current collector plate and the tab in the electrode assembly. In severe cases, the connection between the current collector plate and the top cover assembly will even break, resulting in electrical connection failure or low service life of the single cell.

[0005] To achieve the above object, the single cell provided by the present application has a first direction, and the single cell includes:

[0006] A housing having an open end;

[0007] An electrode assembly disposed inside the housing;

[0008] A top cover assembly covering the open end;

[0009] A first current collector plate installed between the electrode assembly and the top cover assembly, including a first connection portion, an elastic connection portion, and a second connection portion. The second connection portion and the first connection portion are staggeredly arranged in the first direction. The elastic connection portion is disposed between the first connection portion and the second connection portion and is inclined from the first connection portion toward the second connection portion. One of the first connection portion and the second connection portion is connected to the top cover assembly, and the other is connected to the electrode assembly. A plurality of through holes are formed in the first current collector plate, and the plurality of through holes are spaced apart circumferentially around the first current collector plate.

[0010] In this technical solution, an elastic connecting portion is connected between the first connecting portion and the second connecting portion. Since the elastic connecting portion is elastic and inclined, it will undergo a certain degree of deformation when subjected to an external force, so as to ensure that the first connecting portion and / or the second connecting portion are more likely to displace in the first direction Z. Moreover, a plurality of through holes are formed in the first current collecting plate at intervals along its circumferential direction, dividing the first current collecting plate into a plurality of regions, reducing the structural strength of the first current collecting plate, enabling it to better adapt to external forces or pressures, and making the first connecting portion and / or the second connecting portion more likely to displace in the first direction. Thus, when the single cell is in a working condition of long-term shaking and vibration, by elastically connecting the top cover assembly and the electrode assembly through the first current collecting plate, the rigid tearing between the electrode assembly and the top cover assembly can be effectively reduced. At the same time, the above settings are also beneficial to reducing the possibility of fracture at the connection between the first current collecting plate and the tab in the electrode assembly, thereby being able to reduce the electrical connection failure of the single cell and improve the service life of the single cell.

[0011] In some embodiments of the present application, the first connecting portion is connected to the electrode assembly, the second connecting portion is connected to the top cover assembly, and in the first direction, the second connecting portion is closer to the top cover assembly than the first connecting portion.

[0012] In some embodiments of the present application, the plurality of through holes divide the elastic connecting portion into a plurality of elastic sub-connecting portions.

[0013] In some embodiments of the present application, each through hole extends along the radial direction of the first current collecting plate, and each through hole penetrates the elastic connecting portion from the outer region of the first connecting portion and extends to the inner region of the second connecting portion.

[0014] In some embodiments of the present application, the first connecting portion is welded to the electrode assembly, and a welding mark is formed on the side of the first connecting portion facing away from the electrode assembly. Along the circumferential direction of the first current collecting plate, the welding mark and the through holes are alternately arranged.

[0015] In some embodiments of the present application, the top cover assembly includes:

[0016] A top cover, covering the open end and located on the side of the electrode assembly close to the open end. The top cover has a protruding structure protruding towards the first current collecting plate, and the protruding structure is connected to the second connecting portion.

[0017] In some embodiments of the present application, the electrode assembly includes a battery cell, a first tab and a second tab. The polarities of the first tab and the second tab are opposite, and both are disposed at one end of the battery cell facing the top cover assembly. The second tab is located on the outer periphery of the first tab and is welded to the first connecting portion.

[0018] In some embodiments of the present application, the top cover assembly includes a top cover, the top cover constitutes a first conductive terminal and is used for electrically connecting to an external circuit, and the single cell further includes:

[0019] A second current collector plate, disposed radially inside the first current collector plate and electrically connected to the first tab, the second current collector plate and the first tab constituting a first electrical connection structure;

[0020] A first insulating member, the second tab and the first current collector plate constituting a second electrical connection structure, the first insulating member being disposed between the first electrical connection structure and the second electrical connection structure;

[0021] A second conductive terminal, disposed on the top cover and electrically connected to the second current collector plate, the second conductive terminal having a polarity opposite to that of the top cover and being used for electrically connecting to an external circuit;

[0022] A second insulating member, disposed between the top cover and the second conductive terminal.

[0023] In some embodiments of the present application, the single cell further includes:

[0024] A seal, sleeved on the outer periphery of the second conductive terminal, sealingly connecting the second conductive terminal and the top cover.

[0025] On the other hand, the present application also provides an electrical device, including the single cell described in any of the above technical solutions.

[0026] Since the electrical device in the present application includes the single cell described in any of the above technical solutions, both can solve the same technical problems and achieve the same technical effects. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 is an exploded view of the single cell in the embodiment of the present application;

[0029] Figure 2 is a side view of the first current collector plate in the single cell in the embodiment of the present application;

[0030] Figure 3 is a top view of the first current collector plate in the single cell in the embodiment of the present application;

[0031] Figure 4 is a cross-sectional view of a single battery in an embodiment of the present application;

[0032] Figure 5 is Figure 4 an enlarged view of part A in

[0033] Figure 6 is a partially enlarged view of a single battery in an embodiment of the present application.

[0034] The main reference numerals in the accompanying drawings of the present application specification are described as follows:

[0035] 1 - housing; 11 - open end;

[0036] 2 - electrode assembly; 21 - battery cell; 22 - first tab; 23 - second tab;

[0037] 3 - top cover assembly; 31 - top cover; 311 - protruding structure;

[0038] 4 - first current collector plate; 41 - first connection part; 411 - welding mark; 42 - elastic connection part; 43 - second connection part; 44 - through hole;

[0039] 5 - second current collector plate;

[0040] 6 - first insulating member;

[0041] 7 - second conductive terminal;

[0042] 8 - second insulating member;

[0043] 9 - seal. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0047] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] This application provides a single cell and an electrical device, which will be 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 this application. And in the following embodiments, each embodiment has its own emphasis. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0049] Referring to Figure 1 and Figure 2 , the single cell provided by this application has a first direction Z. The single cell includes a housing 1, an electrode assembly 2, a top cover assembly 3 and a first current collector 4. The housing 1 has an open end 11. The electrode assembly 2 is disposed inside the housing 1. The top cover assembly 3 covers the open end 11. Among them, the first current collector 4 is installed between the electrode assembly 2 and the top cover assembly 3. The first current collector 4 includes a first connection portion 41, an elastic connection portion 42 and a second connection portion 43. The second connection portion 43 and the first connection portion 41 are arranged offset in the first direction Z. The elastic connection portion 42 is disposed between the first connection portion 41 and the second connection portion 43 and is inclined from the first connection portion 41 towards the second connection portion 43. One of the first connection portion 41 and the second connection portion 43 is connected to the top cover assembly 3 and the other is connected to the electrode assembly 2. A plurality of through holes 44 are formed in the first current collector 4, and the plurality of through holes 44 are arranged at intervals around the circumference of the first current collector 4.

[0050] In this technical solution, an elastic connecting portion 42 is connected between the first connecting portion 41 and the second connecting portion 43. Since the elastic connecting portion 42 has elasticity and is inclined, it will undergo a certain degree of deformation when subjected to an external force, so as to ensure that the first connecting portion 41 and / or the second connecting portion 43 are more likely to displace in the first direction Z. Moreover, a plurality of through holes 44 are arranged at intervals around the circumference of the first current collector plate 4, dividing the first current collector plate 4 into multiple regions, reducing the structural strength of the first current collector plate 4, enabling it to better adapt to external forces or pressures, and making the first connecting portion 41 and / or the second connecting portion 43 more likely to displace in the first direction Z. Thus, when the single cell is in a working condition of long-term shaking and vibration, by elastically connecting the top cover assembly 3 and the electrode assembly 2 through the first current collector plate 4, the rigid tearing between the electrode assembly and the top cover assembly can be effectively reduced. At the same time, the above settings are also beneficial to reducing the possibility of fracture at the connection between the first current collector plate 4 and the tab in the electrode assembly 2, thereby being able to reduce the electrical connection failure of the single cell and improve the service life of the single cell.

[0051] Exemplarily, the first current collector plate 4 has a hollow disc-shaped structure. The above-mentioned first connecting portion 41, elastic connecting portion 42, and second connecting portion 43 are arranged in sequence along the radial direction of the first current collector plate 4, and the outer edge of the second connecting portion 43 is used to form the outer edge of the first current collector plate 4. In other words, the second connecting portion 43 is closer to the outer edge of the first current collector plate 4 than the first connecting portion 41. The first connecting portion 41, elastic connecting portion 42, and second connecting portion 43 are all annular. The planes where the first connecting portion 41 and the second connecting portion 43 are located are both perpendicular to the first direction Z, the elastic connecting portion 42 is inclined relative to the first direction Z, and there is an included angle between the radial direction of the elastic connecting portion 42 and the first direction Z. That is, in the horizontal direction, the distance between the inner edge of the elastic connecting portion 42 and the central axis of the first current collector plate 4 is greater than or less than the distance between the outer edge of the elastic connecting portion 42 and the central axis of the first current collector plate 4. The above-mentioned horizontal direction is perpendicular to the first direction Z.

[0052] To facilitate the assembly connection between the first current collector plate 4 and the top cover assembly 3 and the electrode assembly 2, the first connecting portion 41 is connected to the electrode assembly 2, the second connecting portion 43 is connected to the top cover assembly 3, and in the first direction Z, the second connecting portion 43 is closer to the top cover assembly 3 than the first connecting portion 41.

[0053] Of course, it is also possible to connect the first connecting portion 41 to the top cover assembly 3 and the second connecting portion 43 to the electrode assembly 2. In the first direction Z, the first connecting portion 41 is closer to the top cover assembly 3 than the second connecting portion 43, and the difference from the above technical solution lies in the different inclination directions of the elastic connecting portion 42.

[0054] Based on the above embodiments, in order to further ensure that the first connecting portion 41 and / or the second connecting portion 43 are more likely to displace in the first direction Z, as Figure 3 shown, a plurality of through holes 44 are formed in the first current collecting plate 4 of the present application. The plurality of through holes 44 are arranged at intervals along the circumferential direction of the first current collecting plate 4, and the elastic connecting portion 42 is divided into a plurality of elastic sub-connecting portions. In other words, the above-mentioned through holes 44 divide the elastic connecting portion 42, and each elastic sub-connecting portion can deform relatively independently, so as to better adapt to external forces or pressures, and increase the flexibility and torsional ability of the structure.

[0055] Exemplarily, the plurality of through holes 44 are evenly arranged at intervals along the circumferential direction of the first current collecting plate 4, increasing the uniformity of the structure, so that forces or pressures can be transmitted to the first connecting portion 41 and / or the second connecting portion 43 more evenly.

[0056] In some other embodiments of the present application, a plurality of through holes 44 are formed in the first current collecting plate 4. Each through hole 44 penetrates the elastic connecting portion 42 from the outer region of the first connecting portion 41 and extends to the inner region of the second connecting portion 43, so that the outer region of the first connecting portion 41 and the inner region of the second connecting portion 43 can maintain the flexibility or elasticity of the elastic connecting portion 42, thereby being able to better adapt to the movement and deformation of the first connecting portion 41 and the second connecting portion 43.

[0057] As Figure 3 shown, when observing the first current collecting plate 4 from the top, the through hole 44 is waist-shaped, and one side of the waist-shaped through hole 44 in its length direction extends to the first connecting portion 41 and the other side extends to the second connecting portion 43. Among them, the above-mentioned first connecting portion 41, elastic connecting portion 42 and second connecting portion 43 have an integral structure, which is convenient for subsequent assembly.

[0058] Please continue to refer to Figure 3 , the first connecting portion 41 is welded to the electrode assembly 2 to achieve a firm and reliable connection between the two. After welding, a welding mark 411 will be formed on the side of the first connecting portion 41 facing away from the electrode assembly 2. Along the circumferential direction of the first current collecting plate 4, the welding mark 411 and the through hole 44 are arranged alternately. Among them, the welding mark 411 is the area where the first connecting portion 41 is welded to the electrode assembly 2 to ensure a firm connection. The through hole 44 is for increasing the flexibility and adaptability of the structure. The alternating arrangement of the welding mark 411 and the through hole 44 can meet the design requirements of welding and through holes, and can also ensure that the structure has good stability and reliability.

[0059] In some embodiments of the present application, refer to Figure 1 , Figure 4 and Figure 5, the top cover assembly 3 includes a top cover 31, the top cover 31 is covered on the open end 11 and is located on the side of the electrode assembly 2 close to the open end 11. The top cover 31 has a convex structure 311 protruding towards the first current collector 4, and the convex structure 311 is connected to the second connecting portion 43. On the one hand, the concave-convex design can increase the surface area and cross-sectional area of the structure, thereby improving the strength and stiffness of the structure. On the other hand, the convex structure 311 can increase the torsional stiffness and load-bearing capacity of the structure, and resist deformation and distortion.

[0060] In other words, the top cover 31 has a concave-convex structure, and both the upper surface and the lower surface of the top cover 31 have a concave-convex structure, that is, both the upper surface and the lower surface of the top cover 31 are non-planar surfaces. The side wall of the convex structure 311 facing the first current collector 4 protrudes towards the first current collector 4, and the side wall of the convex structure 311 facing away from the first current collector 4 is recessed towards the first current collector 4.

[0061] Refer to Figure 6 , the electrode assembly 2 includes a battery cell 21, a first tab 22 and a second tab 23. The first tab 22 and the second tab 23 have opposite polarities and are both provided at one end of the battery cell 21 facing the top cover assembly 3. The second tab 23 is located on the outer periphery of the first tab 22 and is welded to the first connecting portion 41. Arranging the first tab 22 and the second tab 23 on the same side of the single battery can reduce the size of the single battery in the first direction Z, and thus is beneficial to improving the energy density of the single battery.

[0062] Based on the above embodiments, the top cover assembly 3 includes a top cover 31. The top cover 31 constitutes a first conductive terminal and is used for electrically connecting to an external circuit. The single battery further includes a second current collector 5, a first insulating member 6, a second conductive terminal 7 and a second insulating member 8. The second current collector 5 is provided on the radially inner side of the first current collector 4, corresponds to and is electrically connected to the first tab 22. The second current collector 5 and the first tab 22 constitute a first electrical connection structure. The second tab 23 and the first current collector 4 constitute a second electrical connection structure. The first insulating member 6 is provided between the first electrical connection structure and the second electrical connection structure to insulate and isolate the first electrical connection structure and the second electrical connection structure. The second conductive terminal 7 is provided on the top cover 31 and is electrically connected to the second current collector 5. The second conductive terminal 7 has a polarity opposite to that of the top cover 31 and is used for electrically connecting to an external circuit. The second insulating member 8 is provided between the top cover 31 and the second conductive terminal 7.

[0063] In this embodiment, by making the top cover 31 constitute the first conductive terminal, that is, the top cover 31 and the second conductive terminal 7 passing through the top cover 31 respectively form the positive and negative conductive terminals of the single battery. Thus, the positive and negative conductive terminals are located on the same side of the single battery (i.e., Figure 6 the top side shown), thereby reducing the height dimension of the single battery, which is beneficial to further improving the energy density of the single battery.

[0064] Based on the above embodiments, the single cell further includes a seal 9 sleeved on the outer periphery of the second conductive terminal 7, sealingly connecting the second conductive terminal 7 and the top cover 31 to protect the other components installed in the housing 1 and prevent external impurities from entering the interior of the housing 1, thereby affecting the reliability of the other components installed in the housing 1. In addition, the seal 9 can also provide a certain degree of buffering effect to reduce the impact of vibration or shock on the second conductive terminal 7. Exemplarily, the seal 9 is an O-ring.

[0065] In some embodiments of the present application, the present application further provides an electrical device, which includes the single cell described in any of the above technical solutions.

[0066] Since the electrical device in the present application includes the single cell described in any of the above technical solutions, both can solve the same technical problems and achieve the same technical effects.

[0067] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0068] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims. In addition, specific examples are used in the specification to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application, and the content of this specification should not be construed as a limitation to the present application.

Claims

1. A single cell battery, characterized in that: The single cell has a first direction (Z), and the single cell comprises: A housing (1) having an open end (11); An electrode assembly (2) is arranged inside the housing (1); A top cover assembly (3) covering the opening end (11); A first current collecting disk (4) is installed between the electrode assembly (2) and the top cover assembly (3), and comprises a first connecting portion (41), an elastic connecting portion (42) and a second connecting portion (43); the second connecting portion (43) and the first connecting portion (41) are staggered in the first direction (Z); the elastic connecting portion (42) is arranged between the first connecting portion (41) and the second connecting portion (43), and is inclined from the first connecting portion (41) toward the second connecting portion (43); one of the first connecting portion (41) and the second connecting portion (43) is connected to the top cover assembly (3), and the other is connected to the electrode assembly (2); a plurality of through holes (44) are provided on the first current collecting disk (4); and the plurality of through holes (44) are arranged at intervals around the circumference of the first current collecting disk (4).

2. The single cell according to claim 1, characterized in that: The first connecting portion (41) is connected to the electrode assembly (2), and the second connecting portion (43) is connected to the top cover assembly (3). In the first direction (Z), the second connecting portion (43) is closer to the top cover assembly (3) relative to the first connecting portion (41).

3. The single cell according to claim 2, characterized in that: The plurality of through holes (44) divide the elastic connection portion (42) into a plurality of elastic sub-connection portions.

4. The single cell according to claim 2, characterized in that: Each of the through holes (44) extends in the radial direction of the first collecting plate (4), and each of the through holes (44) penetrates the elastic connecting portion (42) from the outer region of the first connecting portion (41) and extends to the inner region of the second connecting portion (43).

5. The single cell according to claim 3 or 4, characterized in that: The first connecting portion (41) is welded to the electrode assembly (2), and a weld mark (411) is formed on a side of the first connecting portion (41) facing away from the electrode assembly (2), and along the circumference of the first current collecting plate (4), the weld mark (411) and the through holes (44) are arranged alternately.

6. The single cell according to claim 2, characterized in that: The top cover assembly (3) comprises: A top cover (31) is arranged on the opening end (11) and is located on a side of the electrode assembly (2) close to the opening end (11); the top cover (31) has a protruding structure (311) protruding in the direction of the first current collecting plate (4); and the protruding structure (311) is connected to the second connecting portion (43).

7. The single cell according to claim 2, characterized in that: The electrode assembly (2) comprises a battery cell (21), a first pole lug (22) and a second pole lug (23); the first pole lug (22) and the second pole lug (23) have opposite polarities and are both arranged at one end of the battery cell (21) facing the top cover assembly (3); the second pole lug (23) is located at the periphery of the first pole lug (22) and is welded to the first connecting portion (41).

8. The single cell according to claim 7, characterized in that: The top cover assembly (3) comprises a top cover (31), wherein the top cover (31) constitutes a first conductive terminal and is used for electrically connecting to an external circuit. The single cell further comprises: A second current collecting disc (5) is arranged radially inward of the first current collecting disc (4) and is electrically connected to the first pole lug (22), wherein the second current collecting disc (5) and the first pole lug (22) form a first electrical connection structure; A first insulating member (6), the second pole lug (23) and the first current collecting plate (4) form a second electrical connection structure, and the first insulating member (6) is arranged between the first electrical connection structure and the second electrical connection structure; A second conductive terminal (7), arranged on the top cover (31) and electrically connected to the second current collecting plate (5), the second conductive terminal (7) having a polarity opposite to that of the top cover (31), and being used for being electrically connected to an external circuit; The second insulating member (8) is arranged between the top cover (31) and the second conductive terminal (7).

9. The single cell according to claim 8, characterized in that: Also includes: A sealing member (9) is sleeved on the outer circumference of the second conductive terminal (7) to seal and connect the second conductive terminal (7) and the top cover (31).

10. An electrical device, characterized in that: The invention comprises the single cell according to any one of claims 1 to 9.

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