Single battery and battery pack
By designing an insulating film structure and controlling the thickness of the connecting parts to ensure the uniformity of the outer wall thickness of the casing, the problems of uneven cell thickness and outer film lifting were solved, thus improving the insulation and stability of the individual battery.
Patent Information
- Application Number
- CN202423225825.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The current coating method for square aluminum-cased battery cells results in uneven cell thickness, with issues such as outer coating peeling and exposed cells, which affect insulation.
An insulating film structure is designed to ensure the uniformity of the outer wall thickness of the shell and avoid folding and overlapping of the outer film by controlling the thickness of the connection between the first and second bending pieces to be equal to or less than the thickness of the insulating film.
This results in better insulation of individual cells, improved uniformity of outer wall thickness, avoidance of problems such as outer film peeling and cell exposure, and enhanced cell insulation and stability.
Smart Images
Figure CN223898321U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology
[0002] The application of single-cell batteries in energy storage systems is gaining increasing popularity. The lifespan of energy storage systems places extremely high demands on the consistency of battery cells.
[0003] Currently, the coating method of square aluminum-cased battery cells generally involves multiple overlapping areas, meaning that the thickness of the overlapping areas is significantly higher than that of the adjacent areas. This results in uneven thickness of the battery cell, leading to deviations in the consistency of battery cell dimensions. On the sides, there is often a phenomenon of folding and overlapping of the outer coating, which can cause the outer coating to lift up and expose the battery cell, which is detrimental to the insulation of the battery cell. Utility Model Content
[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.
[0005] In a first aspect, this application provides a single-cell battery having a first direction, a second direction, and a third direction intersecting each other, including:
[0006] A housing having a bottom wall located at one end of the housing along a third direction;
[0007] An electrode post, which passes through the housing and is disposed opposite to the bottom wall along the third direction;
[0008] An insulating film includes a first film, a second film, and a third film connected together, with the second film located between the first film and the third film. The second film is disposed outside the bottom wall, and the first film and the third film are disposed on the two outer side walls of the housing along the first direction.
[0009] The insulating film further includes a first bent piece and a third bent piece. The first bent piece is connected to the first film and is disposed on the outer side wall of the housing along the second direction. The third bent piece is connected to the third film and is disposed on the outer side wall of the housing along the second direction. The first bent piece is partially stacked on the side of the third bent piece near the housing. The first bent piece and the third bent piece partially overlap along the second direction to form a connecting portion. The thicknesses of the first film, the second film, and the third film are equal, and the thickness of the connecting portion is equal to or less than the thickness of the first film.
[0010] In some embodiments, the insulating film further includes a second bent piece and a fourth bent piece, wherein the second bent piece is connected to the first film and is disposed opposite to the first bent piece along the second direction;
[0011] The fourth bent piece is connected to the third diaphragm and is disposed opposite to the third bent piece along the second direction;
[0012] The second bent piece is partially stacked on the side of the fourth bent piece near the housing, and the second bent piece and the fourth bent piece partially overlap along the second direction to form a connecting part.
[0013] In some embodiments, the insulating film further includes a fifth folded piece and a sixth folded piece, the fifth folded piece and the sixth folded piece being connected to the second film, the fifth folded piece and the sixth folded piece being disposed on the outer walls of both sides of the housing along the second direction, the fifth folded piece being stacked on the side of the first folded piece facing the housing, and the sixth folded piece being stacked on the side of the second folded piece facing the housing.
[0014] In some embodiments, the first bent piece has a first notch at one end along the third direction near the fifth bent piece;
[0015] The second bent piece has a second notch at one end along the third direction near the sixth bent piece.
[0016] In some embodiments, the third bent piece has a third notch on the side near the fifth bent piece, and the fourth bent piece has a fourth notch on the end near the sixth bent piece along the third direction; the housing has a central axis parallel to the third direction, the first notch and the third notch are symmetrically arranged about the central axis, and the third notch and the fourth notch are symmetrically arranged about the central axis.
[0017] In some embodiments, the length of the first bent piece along the first direction decreases from the direction away from the bottom wall to the direction closer to the bottom wall; the length of the third bent piece along the first direction decreases from the direction away from the bottom wall to the direction closer to the bottom wall.
[0018] In some embodiments, along the second direction, the fifth bent piece partially exposes the first notch and the third notch; the sixth bent piece partially exposes the second notch and the fourth notch.
[0019] In some embodiments, the thickness of the fifth bent piece is equal to or less than half the thickness of the first bent piece; the thickness of the sixth bent piece is equal to or less than half the thickness of the second bent piece.
[0020] In some embodiments, along the first direction, the width of the first bent piece is smaller than the width of the housing; along the first direction, the width of each of the third bent pieces is smaller than the width of the housing.
[0021] Secondly, this application provides a battery pack, including the single battery cells as described above.
[0022] The embodiments of this application have the following advantages: by controlling the thickness of the connection portion formed by the connection between the first bending piece and the second bending piece, so that the thickness of the connection portion is equal to or less than the thickness of the insulating film, not only can the width of the single cell be reduced, but also the uniformity of the outer wall thickness of the casing can be guaranteed, and there is no phenomenon of outer film folding and overlapping, which makes the insulation of the cell better.
[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0024] 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.
[0025] Figure 1 This application provides a schematic diagram of the structure of a single-cell battery from one perspective, illustrating some embodiments thereof.
[0026] Figure 2 This application provides a schematic diagram of the structure of a single-cell battery from another perspective, illustrating some embodiments thereof.
[0027] Figure 3 This invention provides a schematic diagram of the structure of a single-cell battery with a membrane deployed from one perspective, according to some embodiments of this application.
[0028] Figure 4 An exploded view of the electrode assembly and housing in a single-cell battery provided in some embodiments of this application is shown.
[0029] Explanation of key component symbols:
[0030] 10 - Single cell; 100 - Casing; 110 - Bottom wall; 200 - Terminal post; 300 - Insulating film; 310 - First diaphragm; 320 - Second diaphragm; 330 - Third diaphragm; 340 - First bent piece; 341 - Second bent piece; 3411 - First notch; 3412 - Second notch; 350 - Fifth bent piece; 351 - Sixth bent piece; 360 - Third bent piece; 361 - Fourth bent piece; 3611 - Third notch; 3612 - Fourth notch; 400 - Connecting part.
[0031] X - First direction; Y - Second direction; Z - Third direction; L - Central axis. Detailed Implementation
[0032] 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.
[0033] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0034] 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.
[0035] 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.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0037] like Figures 1 to 4 As shown, some embodiments of this application provide a single cell battery 10, which has a first direction X, a second direction Y and a third direction Z intersecting in pairs. This is mainly used to avoid the phenomenon that the outer insulating film 300 will lift up due to a large thickness difference on the outer wall of the housing 100 during the thin film process, so as to ensure the uniformity of the outer surface thickness of the housing 100 and the absence of outer film folding and overlapping, thus making the insulation of the cell better.
[0038] The single cell 10 includes a casing 100, a terminal post 200, and an insulating film 300.
[0039] The housing 100 has a bottom wall 110 located at one end of the housing 100 along the third direction Z.
[0040] The electrode post 200 passes through the housing 100 and protrudes to the side opposite to the bottom wall 110, and the electrode post 200 is positioned opposite to the bottom wall 110 along the third direction Z. It can be understood that the electrode post 200 and the bottom wall 110 are located on opposite sides of the housing 100 along the third direction Z.
[0041] The insulating film 300 includes a first diaphragm 310, a second diaphragm 320 and a third diaphragm 330 connected together. The second diaphragm 320 is located between the first diaphragm 310 and the third diaphragm 330. The second diaphragm 320 is disposed outside the bottom wall 110. The first diaphragm 310 and the third diaphragm 330 are disposed on the outer walls of the housing 100 along the first direction X on both sides.
[0042] The insulating film 300 further includes a first bent piece 340 and a third bent piece 360. The first bent piece 340 is connected to the first film 310 and is disposed on the outer side wall of the housing 100 along the second direction Y. It can be understood that the first bent piece 340 is attached to one side of the housing 100 along the second direction Y.
[0043] Furthermore, the third bent piece 360 is connected to the third diaphragm 330, and the third bent piece 360 is disposed on the outer side wall of the housing 100 along the second direction Y. It can be understood that the third bent piece 360 is attached to one side of the housing 100 along the second direction Y.
[0044] In this embodiment, the first bent piece 340 is partially stacked on the side of the third bent piece 360 near the housing 100, and the first bent piece 340 and the third bent piece 360 partially overlap along the second direction Y to form a connecting portion 400. The first diaphragm 310, the second diaphragm 320, and the third diaphragm 330 have equal thicknesses, and the thickness of the connecting portion 400 is equal to or less than the thickness of the first diaphragm 310. It is understood that by controlling the thickness of the connecting portion 400 to be equal to or less than the thickness of the first diaphragm 310, the connection between the first bent piece 340 and the third bent piece 360 not only ensures the stability of the insulating film 300 covering the housing 100, preventing the insulating film 300 from falling off the housing 100, but also ensures the uniformity of the thickness of the insulating film 300 in different areas outside the housing 100.
[0045] It is worth noting that the side of the first bent piece 340 near the third bent piece 360 is connected to the side of the third bent piece 360 near the first bent piece 340. Along the second direction Y, the area where the first bent piece 340 and the third bent piece 360 overlap is the connecting part 400.
[0046] like Figure 3 As shown, in some embodiments, the insulating film 300 further includes a second bent piece 341 and a fourth bent piece 361. The second bent piece 341 is connected to the first film 310, and the second bent piece 341 is disposed opposite to the first bent piece 340 along the second direction Y. In this embodiment, the second bent piece 341 and the first bent piece 340 are symmetrically disposed on two opposite sides of the first film 310 along the second direction Y to ensure the consistency of the bonding area and the bonding thickness of the first bent piece 340 and the second bent piece 341 on both sides of the housing 100 along the second direction Y.
[0047] Furthermore, the fourth bent piece 361 is connected to the third diaphragm 330 and is disposed opposite to the third bent piece 360 along the second direction Y. In this embodiment, the third bent piece 360 and the fourth bent piece 361 are symmetrically disposed on two opposite sides of the third diaphragm 330 along the second direction Y to ensure the consistency of the bonding area and bonding thickness of the third bent piece 360 and the fourth bent piece 361 on both sides of the housing 100 along the second direction Y.
[0048] In this embodiment, the second bent piece 341 is partially stacked on the side of the fourth bent piece 361 near the housing 100, and the second bent piece 341 and the fourth bent piece 361 partially overlap along the second direction Y to form a connecting portion 400. It is understood that the insulating film 300 disposed on the two opposite sides of the housing 100 along the second direction Y has equal thickness. This not only ensures the stability of the insulating film 300 covering the housing 100 and prevents the insulating film 300 from falling off the housing 100, but also ensures the uniformity of the thickness of the insulating film 300 on the two opposite sides of the housing 100 along the second direction Y.
[0049] like Figure 2 As shown, in some embodiments, the insulating film 300 further includes a fifth bent piece 350 and a sixth bent piece 351, which are connected to the second film 320 and are disposed on the outer walls of the housing 100 on both sides along the second direction Y.
[0050] In some embodiments, the fifth bending piece 350 and the sixth bending piece 351 are symmetrically arranged on the two outer walls of the second diaphragm 320 to ensure the consistency of the bonding area and the bonding thickness of the fifth bending piece 350 and the sixth bending piece 351 on the two outer walls of the housing 100 along the second direction Y.
[0051] The fifth bent piece 350 is stacked on the side of the first bent piece 340 facing the housing 100, so that the first bent piece 340 and the third bent piece 360 limit the fifth bent piece 350, ensuring the stability of the connection between the fifth bent piece 350 and the housing 100, and at the same time ensuring the stability of the first bent piece 340, the third bent piece 360 and the fifth bent piece 350 covering the side of the housing 100 along the second direction Y.
[0052] In addition, the sixth bent piece 351 is stacked on the side of the second bent piece 341 facing the housing 100, so that the second bent piece 341 and the fourth bent piece 361 limit the sixth bent piece 351, ensuring the stability of the connection between the sixth bent piece 351 and the housing 100, while ensuring the stability of the second bent piece 341, the fourth bent piece 361 and the sixth bent piece 351 covering the other side of the housing 100 along the second direction Y, thereby improving the stability and wrapping quality of the insulating film 300 wrapped around the housing 100.
[0053] like Figure 2 and Figure 3 As shown, in some embodiments, the first bent piece 340 is provided with a first notch 3411 at the end near the fifth bent piece 350 along the third direction Z, so as to reduce the overlapping area of the first bent piece 340 and the third bent piece 360 along the second direction Y, thereby reducing the area of the overlapping portion between the first bent piece 340 and the fifth bent piece 350.
[0054] In addition, the second bent piece 341 is provided with a second notch 3412 at the end near the sixth bent piece 351 along the third direction Z, so as to reduce the overlapping area of the second bent piece 341 and the fourth bent piece 361 along the second direction Y, thereby reducing the area of the overlapping part between the second bent piece 341 and the sixth bent piece 351.
[0055] like Figure 2 and Figure 3 As shown, in some embodiments, the third bent piece 360 is provided with a third notch 3611 on the side near the fifth bent piece 350 to reduce the overlapping area of the third bent piece 360 and the first bent piece 340 along the second direction Y, thereby reducing the area of the overlapping portion between the third bent piece 360 and the fifth bent piece 350.
[0056] In addition, the fourth bend 361 is provided with a fourth notch 3612 at the end of the fourth bend 361 close to the sixth bend 351 along the third direction Z, so as to reduce the overlapping area of the fourth bend 361 and the second bend 341 along the second direction Y, thereby reducing the area of the overlapping part between the fourth bend 361 and the sixth bend 351.
[0057] In this embodiment, the housing has a central axis L parallel to the third direction Z. The first notch 3411 and the second notch 3412 are symmetrically arranged about the central axis L, and the third notch 3611 and the fourth notch 3612 are symmetrically arranged about the central axis L. This makes the overlapping areas between the first bent piece 340 and the third bent piece 360 and the fifth bent piece 350, and the overlapping areas between the second bent piece 341 and the fourth bent piece 361 and the sixth bent piece 351, equal, thereby ensuring the uniformity of the thickness of the insulating film 300 on both sides of the housing 100 along the second direction Y.
[0058] like Figure 2 and Figure 3 As shown, in some embodiments, the length of the first bent piece 340 along the first direction X decreases from the direction away from the bottom wall 110 to the direction closer to the bottom wall 110. Additionally, the length of the first bent piece 340 along the third direction Z decreases from the side closer to the first diaphragm 310 to the side farther from the first diaphragm 310.
[0059] Since the fifth bending piece 350 is located on the side of the first bending piece 340 that is close to the second diaphragm 320, the area of the overlapping portion between the first bending piece 340 and the fifth bending piece 350 is reduced by decreasing the length of the side of the first bending piece 340 that is close to the second diaphragm 320, so as to ensure the uniformity of the outer thickness of the housing 100.
[0060] The length of the third bent piece 360 along the first direction X decreases from the direction away from the bottom wall 110 towards the direction closer to the bottom wall 110. Additionally, the length of the third bent piece 360 along the third direction Z decreases from the side closer to the third diaphragm 330 to the side farther from the third diaphragm 330. It is understood that since the second bent piece 341 is disposed on the side of the third bent piece 360 closer to the second diaphragm 320, reducing the length of the third bent piece 360 on the side closer to the second diaphragm 320 reduces the area of the overlap between the third bent piece 360 and the fifth bent piece 350, thereby ensuring the uniformity of the outer thickness of the housing 100.
[0061] like Figure 2 and Figure 3 As shown, in some embodiments, the fifth bending piece 350 partially exposes the first notch 3411 and the third notch 3611, so that the shell 100 is completely wrapped along one side of the second direction Y by the first bending piece 340, the third bending piece 360 and the fifth bending piece 350, so as to ensure the wrapping quality and stability.
[0062] In addition, the sixth bend 351 partially exposes the second notch 3412 and the fourth notch 3612, so that the housing 100 is completely wrapped on the other side of the second direction Y by the second bend 341, the fourth bend 361 and the sixth bend 351, thereby ensuring the quality of the wrapping and sealing of the housing.
[0063] like Figure 2 As shown, in some embodiments, along the first direction X, the widths of the first bent piece 340 and the third bent piece 360 are both smaller than the width of the housing 100. This prevents the first bent piece 340 and the third bent piece 360 from extending to the outer wall of the housing along the first direction X, ensuring that the first bent piece 340 and the third bent piece 360 are positioned on the sidewall of the housing 100 along the second direction Y, thereby ensuring the uniformity of the outer thickness of the housing 100. Additionally, along the first direction X, the widths of the second bent piece 341 and the fourth bent piece 361 are both smaller than the width of the housing 100. This prevents the second bent piece 341 and the fourth bent piece 361 from extending to the outer wall of the housing along the first direction X, ensuring that the second bent piece 341 and the fourth bent piece 361 are positioned on the sidewall of the housing 100 along the second direction Y, thereby ensuring the uniformity of the outer thickness of the housing 100.
[0064] In some embodiments, along the first direction X, the widths of the first bent piece 340 and the third bent piece 360 are each greater than half the width of the housing 100, to ensure that the first bent piece 340 and the third bent piece 360 at least partially overlap, thereby ensuring the stability of the connection between the first bent piece 340 and the second bent piece 341. Additionally, along the first direction X, the widths of the second bent piece 341 and the fourth bent piece 361 are each greater than half the width of the housing 100, to ensure that the second bent piece 341 and the fourth bent piece 361 at least partially overlap, thereby ensuring the stability of the connection between the second bent piece 341 and the fourth bent piece 361.
[0065] In some embodiments, the first bent piece 340 is provided with a first adhesive layer on the side facing the third bent piece 360, and the first bent piece 340 is connected to the second bent piece 341 through the first adhesive layer.
[0066] Along the first direction X, the length of the first adhesive layer is equal to the length of the connecting portion 400; along the third direction Z, the length of the first adhesive layer is equal to the length of the connecting portion 400, that is, the first adhesive layer is disposed in the overlapping area between the first bent piece 340 and the third bent piece 360 to ensure the stability of the connection between the first bent piece 340 and the third bent piece 360.
[0067] In some embodiments, a second adhesive layer is provided on the side of the second bent piece 341 facing the fourth bent piece 361, and the second bent piece 341 is connected to the fourth bent piece 361 through the second adhesive layer. Along the first direction X, the length of the second adhesive layer is equal to the length of the connecting portion 400; along the third direction Z, the length of the second adhesive layer is equal to the length of the connecting portion 400, that is, the second adhesive layer is disposed in the overlapping area between the second bent piece 341 and the fourth bent piece 361 to ensure the stability of the connection between the second bent piece 341 and the fourth bent piece 361.
[0068] like Figure 2As shown, in some embodiments, the housing 100 has a first wall and a second wall disposed opposite to each other along a first direction X, a third wall and a fourth wall disposed opposite to each other along a second direction Y, and a bottom wall 110 and a sixth wall disposed opposite to each other along a third direction Z. It is understood that a first diaphragm 310 is disposed on the first wall and coincides with the first wall, a third diaphragm 330 is disposed on the second wall and coincides with the second wall, and a second diaphragm 320 is disposed on the bottom wall 110 and coincides with the bottom wall 110. The first diaphragm 310 is disposed on the first wall surface, the second diaphragm 320 is disposed on the bottom wall 110, the third diaphragm 330 is disposed on the second wall surface, the first bent piece 340, the third bent piece 360 and the fifth bent piece 350 are disposed on the third wall surface and completely cover the third wall surface, and the second bent piece 341, the fourth bent piece 361 and the sixth bent piece 351 are disposed on the fourth wall surface and completely cover the fourth wall surface, thereby forming a wrapping around the shell 100.
[0069] like Figure 3 As shown, in some embodiments, the areas of the first diaphragm 310 and the third diaphragm 330 are larger than the area of the second diaphragm 320, the area of the first diaphragm 310 is larger than the area of the first bent piece 340 and the second bent piece 341, and the area of the third diaphragm 330 is larger than the area of the third bent piece 360 and the sixth bent piece 351.
[0070] In some embodiments, the thicknesses of the first diaphragm 310, the second diaphragm 320, the third diaphragm 330, and the connecting portion 400 are all equal, which not only reduces the width of the single cell 10 along the second direction Y, but also ensures the uniformity of the thickness of each region outside the casing 100.
[0071] In some embodiments, the thickness of the fifth bent piece 350 is equal to or less than half the thickness of the first bent piece 340, that is, the thickness of the fifth bent piece 350 is equal to or less than half the thickness of the third bent piece 360. It is understood that by reducing the thickness of the fifth bent piece 350, the thickness of the overlapping portion between the fifth bent piece 350 and the first bent piece 340 is reduced, and simultaneously the thickness of the overlapping portion between the fifth bent piece 350 and the third bent piece 360 is reduced, thereby ensuring the uniformity of the thickness of the outer insulating film 300 of the housing 100.
[0072] In some embodiments, the thickness of the sixth bent piece 351 is equal to or less than half the thickness of the second bent piece 341, that is, the thickness of the sixth bent piece 351 is equal to or less than half the thickness of the fourth bent piece 361. It is understood that by reducing the thickness of the sixth bent piece 351, the thickness of the overlapping portion between the sixth bent piece 351 and the second bent piece 341 is reduced, and the thickness of the overlapping portion between the sixth bent piece 351 and the fourth bent piece 361 is also reduced, thereby ensuring the uniformity of the thickness of the outer insulating film 300 of the housing 100.
[0073] In this embodiment, the first diaphragm 310, the second diaphragm 320, the third diaphragm 330, the first bent piece 340, the second bent piece 341, and the third bent piece 360 are integrally formed to form the insulating film 300, so as to ensure the strength and sealing quality of the insulating film 300.
[0074] In addition, some embodiments of this application also provide a battery pack, including a housing and a single battery cell 10 as described in any of the above embodiments.
[0075] In this embodiment, individual battery cells 10 can be housed in a casing to form a battery pack. Alternatively, multiple individual battery cells 10 can be grouped into a battery module, and then the battery module can be housed in a casing to form a battery pack.
[0076] It is understood that the battery pack has the beneficial effects of the single cell 10 described in any of the above embodiments, which will not be elaborated here.
[0077] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.
[0078] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.
Claims
1. A single-cell battery having intersecting first direction (X), second direction (Y), and third direction (Z), characterized in that, include: The housing (100) has a bottom wall (110) located at one end of the housing (100) along a third direction (Z); A pole post (200) is inserted through the housing (100) and is disposed opposite to the bottom wall (110) along the third direction (Z); An insulating film (300) includes a first diaphragm (310), a second diaphragm (320), and a third diaphragm (330) connected together. The second diaphragm (320) is located between the first diaphragm (310) and the third diaphragm (330). The second diaphragm (320) is disposed on the outer wall of the bottom wall (110). The first diaphragm (310) and the third diaphragm (330) are disposed on the outer walls of the housing (100) on both sides along the first direction (X). The insulating film (300) further includes a first bent piece (340) and a third bent piece (360). The first bent piece (340) is connected to the first film (310) and is disposed on the outer side wall of the housing (100) along the second direction (Y). The third bent piece (360) is connected to the third film (330) and is disposed on the outer side wall of the housing (100) along the second direction (Y). The first bent piece (340) is partially stacked on the side of the third bent piece (360) near the housing (100). The first bent piece (340) and the third bent piece (360) partially overlap along the second direction (Y) to form a connecting portion (400). The thicknesses of the first diaphragm (310), the second diaphragm (320), and the third diaphragm (330) are equal. The thickness of the connecting portion (400) is equal to or less than the thickness of the first diaphragm (310).
2. The single-cell battery according to claim 1, characterized in that, The insulating film (300) further includes a second bent piece (341) and a fourth bent piece (361), wherein the second bent piece (341) is connected to the first film (310) and is disposed opposite to the first bent piece (340) along the second direction (Y); The fourth bent piece (361) is connected to the third diaphragm (330) and is disposed opposite to the third bent piece (360) along the second direction (Y); The second bent piece (341) is partially stacked on the side of the fourth bent piece (361) near the housing (100), and the second bent piece (341) and the fourth bent piece (361) partially overlap along the second direction (Y) to form a connecting part (400).
3. The single-cell battery according to claim 2, characterized in that, The insulating film (300) further includes a fifth bent piece (350) and a sixth bent piece (351), which are connected to the second film (320). The fifth bent piece (350) and the sixth bent piece (351) are disposed on the outer walls of the housing (100) along the second direction (Y). The fifth bent piece (350) is stacked on the side of the first bent piece (340) facing the housing (100), and the sixth bent piece (351) is stacked on the side of the second bent piece (341) facing the housing (100).
4. The single-cell battery according to claim 3, characterized in that, The first bent piece (340) has a first notch (3411) at one end along the third direction (Z) near the fifth bent piece (350). The second bent piece (341) has a second notch (3412) at one end along the third direction (Z) near the sixth bent piece (351).
5. The single-cell battery according to claim 4, characterized in that, The third bent piece (360) has a third notch (3611) on the side near the fifth bent piece (350), and the fourth bent piece (361) has a fourth notch (3612) at the end near the sixth bent piece (351) along the third direction (Z); the housing (100) has a central axis (L), which is parallel to the third direction (Z), the first notch (3411) and the first notch (3411) are symmetrically arranged about the central axis (L), and the third notch (3611) and the fourth notch (3612) are symmetrically arranged about the central axis (L).
6. The single-cell battery according to claim 4, characterized in that, The length of the first bent piece (340) along the first direction (X) decreases from the direction away from the bottom wall (110) to the direction closer to the bottom wall (110); the length of the third bent piece (360) along the first direction (X) decreases from the direction away from the bottom wall (110) to the direction closer to the bottom wall (110).
7. The single-cell battery according to claim 5, characterized in that, Along the second direction (Y), the fifth bent piece (350) partially exposes the first notch (3411) and the third notch (3611); the sixth bent piece (351) partially exposes the second notch (3412) and the fourth notch (3612).
8. The single-cell battery according to claim 3, characterized in that, The thickness of the fifth bent piece (350) is equal to or less than half the thickness of the first bent piece (340); the thickness of the sixth bent piece (351) is equal to or less than half the thickness of the second bent piece (341).
9. The single-cell battery according to claim 1, characterized in that, Along the first direction (X), the width of the first bent piece (340) is smaller than the width of the housing (100); along the first direction (X), the width of the third bent piece (360) is smaller than the width of the housing (100).
10. A battery pack, characterized in that, include: The single cell (10) as described in any one of claims 1 to 9.