A single battery, a battery pack and an electric device

Abstract

The application discloses a single battery, a battery pack and an electric equipment, and relates to the technical field of new energy batteries. The single battery has a first direction, and comprises a shell, a top cover, an electrode assembly and an explosion-proof valve. The electrode assembly is arranged in a containing cavity formed by cooperation of the shell and the top cover. The explosion-proof valve comprises a main body part, a connecting part, and a first connecting surface. The main body part is provided with a notch. The connecting part is arranged around the main body part and connected with the top cover. The connecting part comprises the first connecting surface facing the top cover. The size H1 of the first connecting surface along the first direction is the same as the size H2 of the top cover along the first direction. The single battery provided by the application can ensure the stability of the explosion-proof value before and after the explosion-proof valve is welded with the top cover.

Description

Technical Field

[0001] This application relates to the field of new energy battery technology, and in particular to a single cell, a battery pack, and an electrical device. Background Technology

[0002] Existing power batteries typically have an explosion-proof valve on their casing to release pressure in the event of thermal runaway or other situations.

[0003] In the prior art, when the explosion-proof valve parts on the power battery are welded to the shell cover, the structural strength of each part of the explosion-proof valve is easily affected by the welding heat, resulting in the explosion value of the explosion-proof valve parts failing to meet the requirements. Utility Model Content

[0004] This application provides a single battery cell, a battery pack, and an electrical device to ensure the stability of the burst value of the explosion-proof valve before and after welding with the top cover.

[0005] This application provides a single-cell battery having a first orientation. The single-cell battery includes a housing, a top cover, an electrode assembly, and an explosion-proof valve. The electrode assembly is disposed in a cavity formed by the housing and the top cover. The explosion-proof valve includes: The main body is provided with engravings; A connecting portion is disposed around the main body and connected to the top cover. The connecting portion includes a first connecting surface facing the top cover. The dimension H1 of the first connecting surface along the first direction is the same as the dimension H2 of the top cover along the first direction.

[0006] In some possible implementations, the main body includes a buffer structure and a body structure, the buffer structure is disposed around the body structure, the side of the buffer structure opposite to the body structure is connected to the connecting portion, and the groove is located on the body structure.

[0007] In some possible implementations, the buffer structure includes a first folded structure segment and a second folded structure segment connected together, wherein the first folded structure segment is stacked on the side of the second folded structure segment opposite to the electrode assembly; The end of the first folding structure segment away from the second folding structure segment is connected to the main body structure, and the end of the second folding structure segment away from the first folding structure segment is connected to the connecting part.

[0008] In some possible implementations, the main body is a flat sheet structure.

[0009] In some possible implementations, the connecting portion is provided with an injection hole that extends through the connecting portion along the first direction and communicates with the receiving cavity.

[0010] In some possible implementations, the connecting portion is welded to the top cover, and the connecting portion is made of the same material as the top cover.

[0011] In some possible implementations, the connecting portion protrudes from the side facing the top cover and is provided with a first step structure, the first connecting surface extending to the surface of the first step structure facing the top cover. The top cover is provided with a second step structure, and the first step structure abuts against the side of the second step structure facing the electrode assembly and is welded to the second step structure.

[0012] In some possible implementations, the explosion-proof valve is made of a first material, and the top cover is made of a second material, wherein the first material and the second material are different.

[0013] Secondly, this application also provides a battery pack, which includes the individual battery cells provided in the above embodiments.

[0014] Secondly, this application also provides an electrical device, including the single battery cell described in the above embodiments.

[0015] The beneficial effects of this application are as follows: In the single-cell battery provided by this application, the dimension H1 of the first connecting surface along the first direction is the same as the dimension H2 of the top cover along the first direction, which allows for the thickening of the connecting part. Therefore, the connecting part can absorb the heat generated during welding of the explosion-proof valve and the top cover, reducing the impact of welding heat on the structural strength of various parts of the explosion-proof valve and ensuring the stability of the explosion-proof valve's burst value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 Schematic diagrams of the exploded structure of a single cell are shown in some embodiments; Figure 2 Schematic diagrams of the top cover and explosion-proof valve in some embodiments are shown; Figure 3 Schematic diagrams of the top cover and explosion-proof valve are shown in other embodiments; Figure 4 Schematic diagrams of the top cover and explosion-proof valve are shown in some other embodiments; Figure 5A schematic diagram of the top cover and explosion-proof valve is shown in some embodiments.

[0018] Explanation of key component symbols: 110 - Shell; 120 - Top cover; 121 - Second step structure; 130 - Receiving cavity; 200 - Electrode assembly; 300 - Explosion-proof valve; 310 - Main body; 311 - Body structure; 3111 - Score; 3112 - Injection hole; 312 - Buffer structure; 3121 - First folding structure section; 3122 - Second folding structure section; 320 - Connecting part; 321 - First step structure; 322 - First connecting surface; Z - First direction. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] like Figure 1 and Figure 2 As shown, an embodiment provides a single-cell battery with a first direction Z. In some embodiments, the first direction Z may be parallel to the height direction of the single-cell battery.

[0025] In this embodiment, the single battery cell includes a housing 110, a top cover 120, an electrode assembly 200, and an explosion-proof valve 300. The top cover 120 is connected to one end of the housing 110 by welding or other means, and can cooperate with the housing 110 to form a receiving cavity 130. The electrode assembly 200 can be disposed within the receiving cavity 130 formed by the housing 110 and the top cover 120. The explosion-proof valve 300 can be disposed on the top cover 120. In this embodiment, the explosion-proof valve 300 can be used to open in the event of thermal runaway or other situations in the single battery cell to relieve internal pressure, reduce the risk of explosion, and improve the safety of the single battery cell.

[0026] In some embodiments, the explosion-proof valve 300 may include a main body 310 and a connecting portion 320. The main body 310 is provided with grooves 3111. The connecting portion 320 may be disposed around the periphery of the main body 310, and the connecting portion 320 may be disposed around the main body 310 for one circumference. In some embodiments, the main body 310 and the connecting portion 320 may be an integral structure.

[0027] In some embodiments, the side of the connecting portion 320 facing away from the main body portion 310 can be welded to the top cover 120. In this embodiment, a first connecting surface 322 is provided on the side of the connecting portion 320 facing the top cover 120, and the first connecting surface 322 can be welded to the top cover 120. The dimension H1 of the first connecting surface 322 along the first direction Z is the same as the dimension H2 of the top cover 120 along the first direction Z. The dimension H1 of the first connecting surface 322 along the first direction Z can refer to the dimension along the first direction Z of the projection of the first connecting surface 322 onto the surface of the top cover 120 facing the explosion-proof valve 300. Furthermore, a machining error of ±0.5 mm is allowed between the dimension H1 of the first connecting surface 322 along the first direction Z and the dimension H2 of the top cover 120 along the first direction Z.

[0028] In this embodiment, the dimension H1 of the first connecting surface 322 along the first direction Z is the same as the dimension H2 of the top cover 120 along the first direction Z, thus achieving a thickened connection portion 320. Compared to the connection between the explosion-proof valve 300 and the top cover 120 in the prior art, the connection portion 320 of this application has a larger dimension along the first direction Z. Therefore, the connection portion 320 can absorb the heat effect generated during welding of the explosion-proof valve 300 and the top cover 120, reducing the impact of welding heat on the structural strength of various parts of the explosion-proof valve 300 and ensuring the stability of the explosion-proof valve 300's burst value.

[0029] like Figure 2 As shown, in some embodiments, the main body 310 may include an integral buffer structure 312 and a body structure 311. The buffer structure 312 may be disposed around the periphery of the body structure 311, and the buffer structure 312 may be disposed around the entire circumference of the body structure 311. The side of the buffer structure 312 facing away from the body structure 311 may be connected to the connecting portion 320. In some embodiments, the buffer structure 312 and the body structure 311 may also be an integral structure.

[0030] In this embodiment, a notch 3111 may be formed on the body structure 311. The thickness of the notch 3111 along the first direction Z may be set to 0.05 mm to 0.1 mm. When a single cell experiences thermal runaway, the notch 3111 may break under the internal pressure of the single cell, causing the explosion-proof valve 300 to open and thus depressurize the single cell.

[0031] like Figures 1 to 3As shown, in some embodiments, the buffer structure 312 may include a first folded structure segment 3121 and a second folded structure segment 3122. The first folded structure segment 3121 is stacked on the side of the second folded structure segment 3122 facing away from the electrode assembly 200. The end of the first folded structure segment 3121 away from the second folded structure segment 3122 may be connected to the main body structure 311. The end of the second folded structure segment 3122 away from the first folded structure segment 3121 may be connected to the connecting portion 320. In the embodiments, when a single battery cell is subjected to vibration or impact, the buffer structure 312 can absorb the impact and vibration received by the explosion-proof valve 300, reducing the possibility of fatigue failure of the explosion-proof valve 300. At the same time, it can also reduce the risk of failure of the explosion-proof valve 300 when subjected to impact and vibration.

[0032] like Figure 5 As shown, in some other embodiments, the main body 310 may also be a flat sheet structure, that is, the explosion-proof valve 300 may be a flat sheet explosion-proof valve, and the main body 310 may be generally a sheet structure.

[0033] like Figure 2 As shown, in some embodiments, the dimension H1 of the first connecting surface 322 along the first direction Z can be set to 1.0mm ≤ H1 ≤ 2.5mm. In some embodiments, the overall dimension of the connecting portion 320 along the first direction Z can be equal to the dimension H1 of the first connecting surface 322 along the first direction Z. Therefore, the connecting portion 320 can absorb the heat effect during laser welding of the explosion-proof valve 300 and the top cover 120, and can also reduce the increase in the material cost of the explosion-proof valve 300. Exemplarily, in some embodiments, the dimension H1 of the first connecting surface 322 along the first direction Z can be set to 1.0mm, 1.2mm, 1.5mm, 1.85mm, 2.0mm, 2.1mm, 2.35mm, 2.5mm, or any other dimension from 1.0mm to 2.5mm.

[0034] like Figure 1 and Figure 4 As shown, in some embodiments, the connecting portion 320 further includes a first step structure 321, which protrudes from the side of the connecting portion 320 away from the main body portion 310, that is, the first step structure 321 protrudes from the side of the connecting portion 320 facing the top cover 120. In addition, a second step structure 121 is provided on the side of the top cover 120 facing the connecting portion 320.

[0035] In some embodiments, along the first direction Z, the first step structure 321 may be located on the side of the first connecting surface 322 near the electrode assembly 200. Along the first direction Z, the second step structure 121 may be located on the side of the top cover 120 away from the electrode assembly 200. In this embodiment, the first step structure 321 may abut against the side of the second step structure 121 facing the electrode assembly 200, and the first step structure 321 and the second step structure 121 are welded together. During the assembly of the explosion-proof valve 300 and the top cover 120, the first step structure 321 and the second step structure 121 can cooperate to provide a limiting function for the explosion-proof valve 300, keeping the explosion-proof valve 300 relatively fixed relative to the top cover 120, so that the connecting part 320 and the top cover 120 can be welded, improving welding accuracy and efficiency.

[0036] In the embodiment, the first connecting surface 322 may extend to the side surface of the first stepped structure 321 opposite to the electrode assembly 200 and the side surface of the first stepped structure 321 facing the top cover 120.

[0037] like Figure 1 and Figure 3 As shown, in some embodiments, the connecting portion 320 is also provided with an injection hole 3112, which can penetrate the connecting portion 320 along the first direction Z. Correspondingly, the injection hole 3112 can communicate with the receiving cavity 130. During the assembly of a single battery cell, electrolyte can be injected into the receiving cavity 130 through the injection hole 3112. In this embodiment, the injection hole 3112 is integrated into the connecting portion 320 of the explosion-proof valve 300, improving the availability of the explosion-proof valve 300 mold, eliminating the need to provide an additional injection hole 3112 on the top cover 120, reducing the development of corresponding molds, and thus reducing the production cost of the single battery cell.

[0038] In some embodiments, the injection hole 3112 may be located at any position around the body portion 310.

[0039] In some embodiments, the explosion-proof valve 300 may be made of a first material, which may be a novel quenched and tempered 3-series aluminum alloy. The cost of this novel quenched and tempered 3-series aluminum alloy is significantly lower than the cost of the ALMXF2-0 aluminum alloy used in existing explosion-proof valves 300. This significantly reduces the production cost of a single battery cell.

[0040] In some embodiments, the top cover 120 may be made of a second material, such as 3003 aluminum alloy. This can further reduce the production cost of a single battery cell.

[0041] In other embodiments, the second material can also be a new type of tempered 3-series aluminum alloy, that is, the top cover 120 can be made of the same material as the explosion-proof valve 300, which can improve the welding quality of the explosion-proof valve 300 and the top cover 120.

[0042] like Figure 1 and Figure 2 As shown, in some embodiments, the overall shape of the explosion-proof valve 300 can be circular, racetrack-shaped, or elliptical. The notch 3111 can also be circular, cross-shaped, racetrack-shaped, or elliptical.

[0043] The embodiment also provides a battery pack, which may include the individual battery cells provided in the embodiment.

[0044] In addition, the embodiment also provides an electrical device, which may include the single battery provided in the embodiment.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A single-cell battery, characterized in that, The single battery cell has a first orientation (Z). The single battery cell includes a housing (110), a top cover (120), an electrode assembly (200), and an explosion-proof valve (300). The electrode assembly (200) is disposed in a receiving cavity (130) formed by the housing (110) and the top cover (120). The explosion-proof valve (300) includes: The main body (310) is provided with a groove (3111). A connecting portion (320) is provided around the main body portion (310) and connected to the top cover (120). The connecting portion (320) includes a first connecting surface (322) facing the top cover (120). The dimension H1 of the first connecting surface (322) along the first direction (Z) is the same as the dimension H2 of the top cover (120) along the first direction (Z).

2. The single-cell battery according to claim 1, characterized in that, The main body (310) includes a buffer structure (312) and a body structure (311). The buffer structure (312) is arranged around the body structure (311). The side of the buffer structure (312) facing away from the body structure (311) is connected to the connecting part (320). The groove (3111) is located on the body structure (311).

3. The single-cell battery according to claim 2, characterized in that, The buffer structure (312) includes a first folded structure segment (3121) and a second folded structure segment (3122) connected together, wherein the first folded structure segment (3121) is stacked on the side of the second folded structure segment (3122) away from the electrode assembly (200); The end of the first folding structure segment (3121) away from the second folding structure segment (3122) is connected to the main body structure (311), and the end of the second folding structure segment (3122) away from the first folding structure segment (3121) is connected to the connecting part (320).

4. The single-cell battery according to claim 1, characterized in that, The main body (310) has a flat sheet structure.

5. The single-cell battery according to any one of claims 1 to 4, characterized in that, The connecting part (320) is provided with an injection hole (3112), which penetrates the connecting part (320) along the first direction (Z) and communicates with the receiving cavity (130).

6. The single-cell battery according to any one of claims 1 to 4, characterized in that, The connecting part (320) is welded to the top cover (120), and the connecting part (320) and the top cover (120) are made of the same material.

7. The single-cell battery according to claim 6, characterized in that, The connecting part (320) has a first step structure (321) protruding from the side facing the top cover (120), and the first connecting surface (322) extends to the surface of the first step structure (321) facing the top cover (120); The top cover (120) is provided with a second step structure (121), and the first step structure (321) abuts against the side of the second step structure (121) facing the electrode assembly (200) and is welded to the second step structure (121).

8. The single-cell battery according to any one of claims 1 to 4, characterized in that, The explosion-proof valve (300) is made of a first material, and the top cover (120) is made of a second material. The first material and the second material are different.

9. A battery pack, characterized in that, The battery pack includes individual cells as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, Including the single cell battery as described in any one of claims 1 to 8.

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