Single battery and electric device

Abstract

The utility model discloses a single battery and a power utilization device, relates to the related technical field of batteries, and is used for solving the problems that the number of parts in an existing single battery is large, and the installation efficiency is low. The single battery provided by the utility model has a first direction, the single battery comprises a shell, the shell is provided with an accommodating cavity, one end of the shell in the first direction is provided with an opening, and the opening is communicated with the accommodating cavity; the first collector plate is arranged at one end, far away from the opening, of the shell and is integrally connected with the shell; the electrode assembly is arranged in the containing cavity, and the end, facing the first current collecting disc, of the electrode assembly is electrically connected with the first current collecting disc. The number of parts in the single battery can be reduced, and the installation efficiency of the single battery can be improved.

Description

Technical Field

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

[0002] With the continuous upgrading of electric vehicle technology and the rapid development of the energy storage industry, lithium-ion batteries, especially large cylindrical lithium-ion batteries, are increasingly being used. However, the existing single battery has a large number of components, which makes the installation of the single battery complex and inefficient.

[0003] Therefore, it is urgent to design a single cell and an electrical device to solve the above technical problems. Utility Model Content

[0004] The present application provides a single cell battery and an electrical device, which can solve the problems of a large number of components and low installation efficiency in existing single cells.

[0005] To achieve the above-mentioned purpose, the single cell provided in the present application has a first direction, and the single cell comprises:

[0006] A housing is provided with a receiving cavity, wherein one end of the housing in the first direction has an opening, and the opening is communicated with the receiving cavity;

[0007] A first collecting plate, arranged at one end of the shell away from the opening and integrally connected to the shell;

[0008] An electrode assembly is disposed in the accommodating cavity, and one end of the electrode assembly facing the first current collecting disk is electrically connected to the first current collecting disk.

[0009] In this embodiment, the present application designs the shell and the first collecting plate as an integrated structure. Therefore, in the production process of the single cell, the assembly process of the shell and the first collecting plate is omitted. In other words, the first collecting plate is composed of a partial structure of the shell, thereby simplifying the number of components in the single cell, which is beneficial to improving the installation efficiency of the single cell.

[0010] In some embodiments of the present application, the single battery further includes:

[0011] End caps,

[0012] The first current collecting plate has an outer end surface away from the electrode assembly, and at least a receiving groove is provided on the first current collecting plate. The receiving groove is formed by a depression of the outer end surface toward one side of the receiving cavity, and the end cover is provided in the receiving groove.

[0013] In some embodiments of the present application, the single cell is a cylindrical battery, the shell has an inner wall, the accommodating groove has a groove wall, the inner wall of the shell and the groove wall of the accommodating groove are spaced apart, and the groove wall of the accommodating groove is close to the center of the shell relative to the inner wall of the shell.

[0014] In some embodiments of the present application, the single battery further includes:

[0015] End caps,

[0016] The shell has a shell end face away from the opening, the end face of the first collecting plate facing away from the accommodating cavity is recessed relative to the shell end face toward one side of the accommodating cavity, the shell and the first collecting plate enclose a mounting groove, and the end cover is arranged in the mounting groove.

[0017] In some embodiments of the present application, the end cover is provided with a liquid injection hole extending along the first direction, the first current collecting plate is provided with a first through hole extending along the first direction, and the first through hole is connected to the liquid injection hole; the single cell further includes:

[0018] The pressure relief member is connected to the end cover and covers the liquid injection hole.

[0019] In some embodiments of the present application, explosion-proof notches are provided on the pressure relief component.

[0020] In some embodiments of the present application, the single battery further includes:

[0021] A protective member is disposed on a side of the pressure relief member away from the first collecting plate along the first direction and is connected to the end cover.

[0022] In some embodiments of the present application, the first current collecting plate is further provided with at least two second through holes penetrating along the first direction, and the at least two second through holes are arranged around the first through hole.

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

[0024] A second current collecting plate is disposed on a side of the electrode assembly away from the first current collecting plate along the first direction and is electrically connected to an end of the electrode assembly close to the opening;

[0025] a cover plate, covering the opening and located at a side of the second current collecting disk away from the electrode assembly, the cover plate being electrically connected to the first current collecting disk through the housing to form a first conductive terminal and being used to be electrically connected to an external circuit;

[0026] a second conductive terminal, disposed on the cover plate and electrically connected to the second current collecting plate, the second conductive terminal being used to be electrically connected to an external circuit, and the polarity of the second conductive terminal being opposite to that of the cover plate;

[0027] The insulating member is disposed between the cover plate and the second conductive terminal to insulate and isolate the cover plate from the second conductive terminal.

[0028] On the other hand, the present application also provides an electrical device, which includes a single cell battery as described in any of the above technical solutions.

[0029] Since the electrical device of the present application includes a single cell as described in any of the above technical solutions, both can solve the same technical problem and achieve the same technical effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 is an exploded view of a single cell in an embodiment of the present application;

[0032] Figure 2 is a schematic structural diagram of a single cell battery housing in one embodiment of the present application;

[0033] Figure 3 is a cross-sectional view of a single cell in one embodiment of the present application;

[0034] Figure 4 is a schematic structural diagram of a single cell housing in another embodiment of the present application;

[0035] Figure 5 is a schematic structural diagram of another embodiment of the present application in which an end cover is provided on the housing of a single cell;

[0036] Figure 6 yes Figure 3 Enlarged view of part A in .

[0037] The main reference numerals in the drawings of this application specification are described as follows:

[0038] 1-housing; 11-accommodating cavity; 12-opening; 13-housing end surface;

[0039] 2-first collecting plate; 21-outer end surface; 22-accommodating groove; 23-installation groove; 24-first through hole; 25-second through hole;

[0040] 3-Electrode assembly;

[0041] 4-end cover; 41-liquid injection hole;

[0042] 5-pressure relief piece; 51-explosion-proof notch;

[0043] 6- Protective parts;

[0044] 7- Second set of streaming discs;

[0045] 8-cover plate;

[0046] 9- a second conductive terminal;

[0047] 10-Insulation parts. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the 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.

[0049] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are 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 device or element referred to 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.

[0050] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] The present application provides a single cell and an electric device, 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.

[0053] Figure 1 is an exploded view of a single cell in an embodiment of the present application, Figure 2 Schematic diagram of the structure of a single battery housing in one embodiment of the present application. Figure 1 and Figure 2 , the single cell has a first direction Z, and the single cell includes a shell 1, a first current collecting disc 2 and an electrode assembly 3. A housing 1 is provided in the housing 1, and an end of the housing 1 in the first direction Z has an opening 12, and the opening 12 is connected to the housing 11. The first current collecting disc 2 is provided at an end of the housing 1 away from the opening 12, and is integrally connected to the housing 1, at least partially blocking the area of ​​the end, and the first current collecting disc 2 and the housing 1 are an integral structure. The electrode assembly 3 is provided in the housing 11, and an end of the electrode assembly 3 facing the first current collecting disc 2 is electrically connected to the first current collecting disc 2.

[0054] In this embodiment, the present application designs the shell 1 and the first current collecting plate 2 as an integrated structure. Therefore, in the production process of the single cell, the assembly process of the shell 1 and the first current collecting plate 2 is omitted. In other words, the first current collecting plate 2 is composed of a partial structure of the shell 1, thereby simplifying the number of components in the single cell, which is beneficial to improving the installation efficiency of the single cell.

[0055] It should be noted that the first current collecting plate and the shell in the prior art are split structures, and the two are manufactured separately and then assembled together. In order to ensure the connection strength between the two, an additional connection structure needs to be set to achieve the connection between the two, which will undoubtedly increase the production cost of the single battery. Therefore, the above-mentioned technical solution of the present application does not need to set the connection structure, which is also conducive to reducing the production cost of the single battery. On this basis, the connection strength of the two can also be guaranteed at the same time.

[0056] In addition, the single cell battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., and this application does not make specific limitations on this.

[0057] Figure 3 is a cross-sectional view of a single cell in one embodiment of the present application, Figure 4 is a schematic structural diagram of a single battery housing in another embodiment of the present application, Figure 5 Schematic diagram of the structure in which an end cover is provided on the housing of a single cell in another embodiment of the present application. Figure 1 to Figure 5 The single battery includes an end cover 4 , and different connection modes between the end cover 4 and the first current collecting plate 2 are described in detail.

[0058] Embodiment 1

[0059] Combination Figure 1 to Figure 3 The single cell further includes an end cap 4. The housing 1 has a housing end face 13 away from the opening 12, and the end face of the first current collecting plate 2 facing away from the accommodating cavity 11 is recessed toward one side of the accommodating cavity 11 relative to the housing end face 13. The housing 1 and the first current collecting plate 2 enclose a mounting groove 23, and the end cap 4 is disposed in the mounting groove 23, thereby facilitating the installation of the end cap 4. Optionally, the end cap 4 can be connected to the mounting groove 23 by welding or bonding.

[0060] It can also be understood that the bottom end surface of the first collecting plate 2 facing away from the accommodating cavity 11 is closer to the accommodating cavity 11 than the shell end surface 13 at the bottom of the shell 1 , and there is a height difference between the two in the first direction Z, thereby forming the above-mentioned installation groove 23 .

[0061] For example, in this embodiment, the end cover 4 includes a first cover body and a second cover body. The diameter of the first cover body is smaller than the diameter of the second cover body and is assembled in the mounting groove 23. The outer diameter of the second cover body is equal to the outer diameter of the shell 1, which helps to reduce the difficulty of assembling the end cover 4 and the shell 1.

[0062] As a variant embodiment, combined with Figure 4 and Figure 5 , the single cell also includes an end cap 4. The single cell is a cylindrical battery, wherein the first current collecting disc 2 has an outer end face 21 away from the electrode assembly 3, and a receiving groove 22 is provided at least on the outer end face 21 of the first current collecting disc 2, the receiving groove 22 is formed by the outer end face 21 being recessed toward one side of the receiving cavity 11, and the end cap 4 is provided in the receiving groove 22, and matches the shape of the receiving groove 22, so as to ensure that the processing technology of the end cap 4 is relatively simple. It should be noted that the shell 1 has an inner wall, the receiving groove 22 has a groove wall, the inner wall of the shell 1 and the groove wall of the receiving groove 22 are arranged at intervals, and the groove wall of the receiving groove 22 is close to the center of the shell 1 relative to the inner wall of the shell 1. Optionally, the diameter of the receiving groove 22 is D1mm, and the outer diameter of the first current collecting disc 2 is D2mm. If D1>D2, it means that the receiving groove 22 extends out of the first current collecting disc 2 in its radial direction, and part of the shell 1 is also provided with the receiving groove 22.

[0063] Based on the above embodiment, the diameter of the receiving groove 22 is D1 mm, and the outer diameter of the first collecting plate 2 is D2 mm, where D1<D2. This can prevent the wall thickness of the portion of the housing 1 corresponding to the receiving groove 22 from being too thin, which is conducive to ensuring the structural strength of the housing 1 at this location.

[0064] Exemplarily, the end cover 4 is a disc-shaped structure and has a wall facing away from the first collecting plate 2, which is flush with the outer end surface 21. That is, the end cover 4 is embedded in the receiving groove 22, and no part protruding from the housing 1 is observed in appearance.

[0065] Hereinafter, the remaining components (eg, the pressure relief member 5 and the protection member 6) provided on the end cover 4 in the first embodiment will be described in detail.

[0066] Figure 6 yes Figure 3 A magnified view of part A in the figure. Figure 1 , Figure 3 and Figure 6 The end cover 4 is provided with a liquid injection hole 41 penetrating along the first direction Z, the first current collecting plate 2 is provided with a first through hole 24 penetrating along the first direction Z, and the first through hole 24 is connected to the liquid injection hole 41; the single cell further includes a pressure relief member 5, which is connected to the end cover 4 and covers the liquid injection hole 41. The pressure relief member 5 can seal the liquid injection hole 41 and release the internal pressure of the single cell, thereby achieving the dual functions of sealing and pressure relief.

[0067] Exemplarily, the injection hole 41 is the center hole of the end cover 4, the first through hole 24 is the center hole of the first current collecting plate 2, and the center axis of the injection hole 41 coincides with the center axis of the first through hole 24. The diameter of the injection hole 41 is larger than the diameter of the first through hole 24, ensuring that when there is an installation error between the injection hole 41 and the first through hole 24 during assembly, the first through hole 24 and the injection hole 41 can also be connected, thereby facilitating reducing the difficulty of assembling the first current collecting plate 2 and the end cover 4.

[0068] The pressure relief member 5 and the end cover 4 are of split structure, that is, the pressure relief member 5 and the end cover 4 are two independent parts, and the pressure relief member 5 can be fixedly connected to the end cover 4 by welding, bonding, etc. Of course, the pressure relief member 5 and the end cover 4 can also be of an integrated structure.

[0069] Based on the above embodiment, in order to ensure that the pressure relief component 5 is easy to manufacture, an explosion-proof notch 51 is provided on the pressure relief component 5. In other words, the explosion-proof notch 51 is a weak structure integrally formed on the pressure relief component 5. Alternatively, in other embodiments, the pressure relief component 5 may also be a pressure relief structure such as a pressure relief valve, an explosion-proof valve, or an explosion-proof disk.

[0070] In some embodiments, the above-mentioned single battery further includes a protective member 6, which is disposed on a side of the pressure relief member 5 away from the first current collecting plate 2 along the first direction Z and connected to the end cover 4 to cover the pressure relief member 5 to prevent the pressure relief member 5 from directly contacting with external components, thereby avoiding damage to the pressure relief member 5. Exemplarily, the protective member 6 is a sheet-like structure, which is a transparent plastic film.

[0071] In some embodiments, the first current collecting plate 2 is further provided with at least two second through holes 25 penetrating along the first direction Z, and the at least two second through holes 25 are arranged around the first through hole 24, so as to facilitate electrolytic infiltration and pressure relief and ventilation of the single battery. The at least two second through holes 25 have the same diameter and are evenly arranged at equal angles around the first through hole 24.

[0072] It is understandable that the end cover 4 in the above-mentioned second embodiment is also provided with a pressure relief member 5 and a protective member 6, and has the same structure and connection method as the pressure relief member 5 and the protective member 6 provided on the end cover 4 in the first embodiment, which will not be repeated here.

[0073] In some embodiments of the present application, the single cell further includes a second current collecting disc 7, a cover plate 8, a second conductive terminal 9, and an insulating member 10. The second current collecting disc 7 is disposed on the side of the electrode assembly 3 away from the first current collecting disc 2 along the first direction Z, and is electrically connected to the end of the electrode assembly 3 near the opening 12. The cover plate 8 is disposed on the opening 12 and is located on the side of the second current collecting disc 7 away from the electrode assembly 3. The cover plate 8 is electrically connected to the first current collecting disc 2 through the shell 1 to form a first conductive terminal and is used to be electrically connected to an external circuit. The second conductive terminal 9 is disposed on the cover plate 8 and is electrically connected to the second current collecting disc 7. The second conductive terminal 9 is used to be electrically connected to an external circuit, and the polarity of the second conductive terminal 9 is opposite to that of the cover plate 8. The insulating member 10 is disposed between the cover plate 8 and the second conductive terminal 9 to insulate and isolate the cover plate 8 and the second conductive terminal 9.

[0074] In this embodiment, the cover plate 8 constitutes the first conductive terminal, that is, the cover plate 8 and the second conductive terminal 9 penetrating the cover plate 8 respectively form the positive and negative conductive terminals of the single battery. In other words, the positive and negative conductive terminals are located on the same side of the single battery (i.e. Figure 1 The top side shown in the figure) reduces the height dimension of the single cell, which is beneficial to improving the energy density of the single cell.

[0075] In some embodiments of the present application, the single cell includes a second current collecting plate 7, a cover plate 8, a second conductive terminal 9 and an insulating member 10, and also includes a pressure relief member 5. The pressure relief member 5 is connected to the end cover 4, and the cover is arranged on the embodiment of the injection hole 41. In the present application, the pressure relief member 5 is arranged at the bottom of the single cell, and the cover plate 8 (i.e., the first conductive terminal) and the second conductive terminal 9 are arranged at the top of the single cell, thereby separating the heat and electricity of the single cell, which is beneficial to improving the safety of the single cell.

[0076] It should be noted that, in some embodiments, the above-mentioned single battery further includes a lower plastic, which is sandwiched between the second current collecting disk 7 and the cover plate 8 to insulate and isolate the second current collecting disk 7 and the cover plate 8 to prevent short circuit between the positive and negative electrodes.

[0077] In some embodiments, the electrode assembly is cylindrical and includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting and to allow the active ions to pass through.

[0078] In some embodiments, the present application further provides an electric device, which includes a single battery as described in any of the above technical solutions. Since the electric device of the present application includes a single battery as described in any of the above technical solutions, the two can solve the same technical problem and achieve the same technical effect.

[0079] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0080] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims. In addition, the specification uses specific examples 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 and its core idea of ​​the present application. 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 (Z), and the single cell comprises: A housing (1) is provided with a receiving cavity (11); one end of the housing (1) in the first direction (Z) has an opening (12), and the opening (12) is in communication with the receiving cavity (11); A first current collecting plate (2) is arranged at an end of the shell (1) away from the opening (12) and is integrally connected to the shell (1); An electrode assembly (3) is disposed in the accommodating cavity (11); one end of the electrode assembly (3) facing the first current collecting disk (2) is electrically connected to the first current collecting disk (2).

2. The single cell according to claim 1, characterized in that: Also includes: End cap (4), The first current collecting disc (2) has an outer end surface (21) away from the electrode assembly (3), and a receiving groove (22) is provided on at least the first current collecting disc (2), wherein the receiving groove (22) is formed by the outer end surface (21) being recessed toward one side of the receiving cavity (11), and the end cover (4) is arranged in the receiving groove (22).

3. The single cell according to claim 2, characterized in that: The single cell is a cylindrical cell, the shell (1) has an inner wall, the receiving groove (22) has a groove wall, the inner wall of the shell (1) and the groove wall of the receiving groove (22) are arranged at an interval, and the groove wall of the receiving groove (22) is close to the center of the shell (1) relative to the inner wall of the shell (1).

4. The single cell according to claim 1, characterized in that: Also includes: End cap (4), The shell (1) has a shell end face (13) away from the opening (12); an end face of the first collecting plate (2) facing away from the accommodating cavity (11) is recessed toward one side of the accommodating cavity (11) relative to the shell end face (13); the shell (1) and the first collecting plate (2) enclose a mounting groove (23); and the end cover (4) is arranged in the mounting groove (23).

5. The single cell according to claim 2 or 4, characterized in that: The end cover (4) is provided with a liquid injection hole (41) extending along the first direction (Z), the first current collecting plate (2) is provided with a first through hole (24) extending along the first direction (Z), and the first through hole (24) is connected to the liquid injection hole (41); the single cell further comprises: A pressure relief member (5) is connected to the end cover (4) and covers the liquid injection hole (41).

6. The single cell according to claim 5, characterized in that: The pressure relief member (5) is provided with an explosion-proof notch (51).

7. The single cell according to claim 5, characterized in that: Also includes: A protective member (6) is arranged on a side of the pressure relief member (5) away from the first current collecting plate (2) along the first direction (Z), and is connected to the end cover (4).

8. The single cell according to claim 5, characterized in that: The first current collecting plate (2) is also provided with at least two second through holes (25) penetrating along the first direction (Z), and the at least two second through holes (25) are arranged around the first through hole (24).

9. The single cell according to claim 1, characterized in that: Also includes: A second current collecting disk (7) is arranged on a side of the electrode assembly (3) away from the first current collecting disk (2) along the first direction (Z), and is electrically connected to an end of the electrode assembly (3) close to the opening (12); a cover plate (8) covering the opening (12) and located on a side of the second current collecting plate (7) away from the electrode assembly (3); the cover plate (8) being electrically connected to the first current collecting plate (2) through the housing (1) to form a first conductive terminal and used for being electrically connected to an external circuit; A second conductive terminal (9) is arranged on the cover plate (8) and is electrically connected to the second current collecting plate (7); the second conductive terminal (9) is used to be electrically connected to an external circuit, and the polarity of the second conductive terminal (9) is opposite to the polarity of the cover plate (8); An insulating member (10) is disposed between the cover plate (8) and the second conductive terminal (9) to insulate and isolate the cover plate (8) and the second conductive terminal (9).

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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