A single cell and a battery pack

Abstract

The application provides a single battery and a battery pack, and belongs to the technical field of batteries. The single battery comprises a top cover, a shell, an electrode assembly, an insulating film and a bottom support plate; the shell is connected with the top cover along a first direction; the electrode assembly is arranged in the shell; the insulating film is arranged in the shell and is sleeved outside the electrode assembly, and the insulating film has a bottom insulating layer, the bottom insulating layer is arranged opposite to the top cover along the first direction, and a first connecting part is arranged on the side of the bottom insulating layer away from the electrode assembly; the bottom support plate is arranged in the shell and on the side of the bottom insulating layer away from the electrode assembly, a second connecting part is arranged on the side of the bottom support plate facing the bottom insulating layer, one of the first connecting part and the second connecting part is provided with a recess, and the other of the first connecting part and the second connecting part is arranged in the recess. The single battery provided by the application is connected through the first connecting part and the second connecting part, so that the convenience and stability of the assembly of the bottom insulating layer and the bottom support plate are ensured.

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] In the field of power batteries, ensuring the manufacturability and safety and reliability of batteries is of paramount importance to battery manufacturers. Among these, the reliability of the battery's valve opening and pressure relief is particularly critical.

[0003] The existing electrode assembly is covered with an insulating film, and a base plate is also provided at the bottom of the insulating film. The existing base plate and insulating film are fixed by a hot-melt process. The hot-melt equipment and tooling positioning used in the hot-melt process will increase the number of steps, increase the manufacturing cost, and affect the process efficiency of the battery. 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.

[0005] This application provides the following technical solution: a single-cell battery, having a first orientation, comprising: case; The top cover is connected to the housing along the first direction; Electrode assembly, disposed within the housing; An insulating film is disposed inside the housing and sleeved on the outside of the electrode assembly. The insulating film has a bottom insulating layer, which is disposed opposite to the top cover along the first direction. A first connecting portion is provided on the side of the bottom insulating layer away from the electrode assembly. A bottom support plate is disposed inside the housing and on the side of the bottom insulating layer away from the electrode assembly. The bottom support plate has a second connecting portion on the side facing the bottom insulating layer. One of the first connecting portion and the second connecting portion forms a recess, and the other of the first connecting portion and the second connecting portion is located in the recess.

[0006] In some embodiments, the first connecting portion is recessed along the first direction toward the side closer to the electrode assembly to form the recessed portion, and the second connecting portion is located in the recessed portion.

[0007] In some embodiments, the single cell has a second direction and a third direction that are mutually perpendicular to the first direction, and the bottom insulating layer is provided with a plurality of first connection portions on the side opposite to the electrode assembly, and the plurality of first connection portions are spaced apart along the second direction and / or the third direction; The bottom plate is provided with a plurality of second connecting parts on the side facing the bottom insulating layer, and one first connecting part is connected to one second connecting part.

[0008] In some embodiments, the bottom insulating layer has a first wall surface disposed opposite to each other along the second direction and a second wall surface disposed opposite to each other along the third direction, the first wall surface and the second wall surface being connected to form a corner portion, and the first connecting portion being adjacent to the corner portion.

[0009] In some embodiments, the first connecting portion protrudes along the first direction toward the side close to the electrode assembly to form a protrusion, or the second connecting portion protrudes along the first direction toward the side away from the electrode assembly to form the protrusion. The protrusion is at least partially housed within the recess.

[0010] In some embodiments, the protrusion includes intersecting first protrusion segments and second protrusion segments; The recessed portion includes a first slot and a second slot that are connected to each other, the first protruding section is received in the first slot, and the second protruding section is received in the second slot.

[0011] In some embodiments, the recess extends through the bottom insulating layer along the first direction; The protrusion, at one end opposite to the bottom support plate, passes through the recess and is located on the side of the bottom insulating layer opposite to the bottom support plate.

[0012] In some embodiments, the protrusion includes a connecting post and an elastic limiting platform. The elastic limiting platform is disposed on the side of the connecting post away from the bottom support plate. The connecting post is received in the recess. The elastic limiting platform passes through the recess and abuts against the side of the bottom insulating layer away from the bottom support plate.

[0013] In some embodiments, the projection of the elastic limiting platform along the first direction onto the plane where the bottom insulating layer is located covers the recess.

[0014] Secondly, this application provides a battery pack including the aforementioned single battery cell.

[0015] The embodiments of this application have the following advantages: by wrapping the insulating film around the electrode assembly and providing a first connecting part on the side of the insulating film away from the electrode assembly, and providing a second connecting part on the side of the bottom support plate facing the bottom insulating layer, the first connecting part and the second connecting part are connected accordingly, and provide guidance and positioning during the connection between the bottom insulating layer and the bottom support plate. This not only improves the convenience of connection and assembly between the insulating layer and the bottom support plate, but also ensures the accuracy and stability of the connection position between the bottom insulating layer and the bottom support plate, reduces manufacturing costs, and thus ensures the stability of the bottom support plate in the cavity, improving the production and assembly efficiency of the single cell.

[0016] 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

[0017] 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.

[0018] Figure 1 An exploded view of a single-cell battery provided by some embodiments of this application is shown; Figure 2 A cross-sectional view of a single-cell battery provided by some embodiments of this application is shown; Figure 3 It shows Figure 2 Enlarged view of section A; Figure 4 This application provides a schematic diagram of the structure of a casing in a single-cell battery from one perspective, based on some embodiments of the present application. Figure 5 It shows Figure 4 Sectional view of section AA; Figure 6 It shows Figure 5 Enlarged view of section B; Figure 7 This invention provides a schematic diagram of the bottom insulating layer in a single-cell battery according to some embodiments of the present application. Figure 8 It shows Figure 7 Enlarged view of section C; Figure 9 This invention provides a schematic diagram of the bottom support plate in a single-cell battery from one perspective, based on some embodiments of the present application. Figure 10 It shows Figure 9 Enlarged view of section D in the middle.

[0019] Explanation of key component symbols: 100-Housing; 200-Electrode assembly; 300-Insulating film; 310-Bottom insulating layer; 320-First connecting part; 330-First wall surface; 340-Second wall surface; 350-Corner part; 400-Bottom support plate; 410-Second connecting part; 500-Top cover; 600-Recessed part; 610-First slot; 620-Second slot; 700-Protrusion; 710-First protruding section; 720-Second protruding section; 730-Connecting post; 740-Elastic limiting platform.

[0020] Z - First direction; X - Second direction; Y - Third direction. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figures 1 to 3 As shown, some embodiments of this application provide a single battery cell with a first direction Z, which mainly ensures the accuracy and stability of the connection position between the bottom insulating layer 310 and the bottom support plate 400, thereby ensuring the stability of the bottom support plate 400 in the receiving cavity and improving the production and assembly efficiency of the single battery cell.

[0027] The single cell includes a casing 100, a top cover 500, an electrode assembly 200, an insulating film 300, and a bottom support plate 400.

[0028] The top cover 500 is connected to the housing 100 along the first direction Z. The connection method between the top cover 500 and the housing 100 includes any one of snap-fit, adhesive, magnetic connection, hinge, interference fit, and riveting, which can be specifically set according to the actual situation.

[0029] The electrode assembly 200 is disposed inside the housing 100 so as to limit and fix the electrode assembly 200 through the top cover 500 and the housing 100, and to protect the electrode assembly 200.

[0030] An insulating film 300 is disposed inside the housing 100 and sleeved over the electrode assembly 200 to insulate and separate the electrode assembly 200 from the housing 100, preventing short circuits caused by contact between the electrode assembly 200 and the housing 100. The insulating film 300 also provides limiting and protection for the electrode assembly 200.

[0031] It should be noted that the electrode assembly 200 is exposed on the side facing the top cover 500 along the first direction Z to the insulating film 300.

[0032] The insulating film 300 has a bottom insulating layer 310, which is disposed opposite to the top cover 500 along the first direction Z. A first connecting portion 320 is provided on the side of the bottom insulating layer 310 away from the electrode assembly 200.

[0033] In addition, the bottom plate 400 is disposed inside the housing 100 and is disposed on the side of the bottom insulating layer 310 away from the electrode assembly 200, so that the bottom insulating layer 310 and the inner wall of the housing 100 along the first direction Z limit the bottom plate 400 to ensure the stability of the bottom plate 400 within the housing 100.

[0034] In this embodiment, the base plate 400 has a second connecting portion 410 on the side facing the bottom insulating layer 310. One of the first connecting portion 320 and the second connecting portion 410 forms a recess 600, and the other of the first connecting portion 320 and the second connecting portion 410 is located within the recess 600. It is understood that in some embodiments, the first connecting portion 320 forms a recess 600, and the second connecting portion 410 is located within the first connecting portion 320; in other embodiments, the second connecting portion 410 forms a recess 600, and the first connecting portion 320 is located within the second connecting portion 410. By connecting the first connecting portion 320 and the second connecting portion 410 with a snap-fit ​​or interference fit, the ease of connection or disassembly between the first connecting portion 320 and the second connecting portion 410 is improved, thereby improving the ease and stability of the connection between the base plate 400 and the bottom insulating layer 310, that is, improving the ease and stability of the connection between the base plate 400 and the insulating film 300. Furthermore, it can reduce assembly process difficulty and lower manufacturing costs.

[0035] It should be noted that the number of the first connecting part 320 and the second connecting part 410 can be one, two or more, and can be set according to the actual situation.

[0036] The number of first connecting parts 320 and the number of second connecting parts 410 are equal, and one first connecting part 320 is connected to one second connecting part 410.

[0037] In some embodiments, there are multiple first connecting portions 320 and multiple second connecting portions 410, and the arrangement of the multiple first connecting portions 320 and multiple second connecting portions 410 can be one of linear arrangement, circular arrangement, arc arrangement, and matrix arrangement.

[0038] It should be noted that by wrapping the insulating film 300 around the electrode assembly 200 and providing a first connecting portion 320 on the side of the insulating film 300 facing away from the electrode assembly 200, and providing a second connecting portion 410 on the side of the bottom support plate 400 facing the bottom insulating layer 310, the first connecting portion 320 and the second connecting portion 410 are connected accordingly. This provides guidance and positioning during the connection process between the bottom insulating layer 310 and the bottom support plate 400, ensuring the accuracy and stability of the connection position between the bottom insulating layer 310 and the bottom support plate 400, thereby ensuring the stability of the bottom support plate 400 in the receiving cavity and improving the production and assembly efficiency of the single cell.

[0039] like Figure 9 and Figure 10As shown, in some embodiments of this application, the first connecting portion 320 is recessed in the first direction Z towards the side near the electrode assembly 200 to form a recessed portion 600, and the second connecting portion 410 protrudes in the direction near the electrode assembly 200. The second connecting portion 410 is located in the recessed portion 600 so that the recessed portion 600 can limit the second connecting portion 410, thereby improving the stability and convenience of the connection between the first connecting portion 320 and the second connecting portion 410.

[0040] In some embodiments, the second connecting portion 410 is recessed in the first direction Z towards the side opposite to the electrode assembly 200 to form a recessed portion 600, and the first connecting portion 320 protrudes in the direction opposite to the electrode assembly 200. The first connecting portion 320 is located in the recessed portion 600 so as to limit the first connecting portion 320 through the recessed portion 600.

[0041] like Figure 5 and Figure 6 As shown, in some embodiments of this application, a single cell has a second direction X and a third direction Y that are mutually perpendicular to the first direction Z. A plurality of first connecting portions 320 are provided on the side of the bottom insulating layer 310 facing away from the electrode assembly 200. The plurality of first connecting portions 320 are spaced apart along the second direction X and / or the third direction Y. It is understood that in some embodiments, the plurality of first connecting portions 320 are spaced apart along the second direction X; in other embodiments, the plurality of first connecting portions 320 are spaced apart along the third direction Y; and in still other embodiments, a portion of the plurality of first connecting portions 320 are spaced apart along the second direction X, and another portion is spaced apart along the third direction Y.

[0042] The base plate 400 has multiple second connecting portions 410 on the side facing the bottom insulating layer 310, with one first connecting portion 320 corresponding to one second connecting portion 410. It is understood that by providing multiple spaced-apart second connecting portions 410, the stability of the connection between the base plate 400 and the bottom insulating layer 310 is improved, preventing displacement between the base plate 400 and the insulating film 300 along the side perpendicular to the first direction Z, thereby ensuring the stability of the connection between the base plate 400 and the insulating film 300.

[0043] like Figure 7 and Figure 8 As shown, in some embodiments of this application, the bottom insulating layer 310 has a first wall surface 330 disposed opposite to each other along a second direction X and a second wall surface 340 disposed opposite to each other along a third direction Y. It can be understood that the bottom insulating layer 310 has two first wall surfaces 330 disposed opposite to each other along the second direction X, and two second wall surfaces 340 disposed opposite to each other along the third direction Y; that is, the first wall surfaces 330 and the second wall surfaces 340 are sequentially connected end-to-end to form a sidewall of the bottom insulating layer 310 perpendicular to the first direction Z.

[0044] In this embodiment, the first wall surface 330 and the second wall surface 340 are connected to form a corner portion 350. It can be understood that the bottom insulating layer 310 has four corner portions 350. By attaching the first connecting portion 320 to the corner portion 350, the accuracy and efficiency of the assembly between the bottom insulating layer 310 and the bottom support plate 400 can be further improved.

[0045] It should be noted that the corner portion 350 is chamfered or right-angled. In this embodiment, the corner portion 350 is chamfered to improve the ease of assembly of the bottom insulating layer 310 in the housing 100, and to improve assembly accuracy and efficiency.

[0046] like Figure 8 As shown, in some embodiments of this application, the first connecting portion 320 protrudes along the first direction Z towards the side near the electrode assembly 200 to form a protrusion 700.

[0047] In some embodiments, the second connection portion 410 protrudes along the first direction Z to the side opposite to the electrode assembly 200 to form a protrusion portion 700.

[0048] In this embodiment, the protrusion 700 is at least partially housed within the recess 600. It is understood that in some embodiments, a portion of the protrusion 700 is housed within the recess 600; in other embodiments, the protrusion 700 is completely housed within the recess 600, to further enhance the stability of the connection between the protrusion 700 and the recess 600, and to improve the stability of the connection between the base plate 400 and the insulating film 300.

[0049] It should be noted that the protrusion 700 is attached to the inner wall of the recess 600 along the first direction Z along the side wall perpendicular to the first direction Z, so as to prevent the protrusion 700 from shaking in the recess 600, thereby ensuring the tightness of the connection between the protrusion 700 and the recess 600.

[0050] The shape of the protrusion 700 is at least one of the following: cylindrical, conical, hemispherical, pyramidal, prismal, or T-shaped.

[0051] like Figures 8 to 10 As shown, in some embodiments of this application, the protrusion 700 includes an intersecting first protrusion segment 710 and a second protrusion segment 720. It should be noted that the first protrusion segment 710 and the second protrusion segment 720 are arc-shaped segments, and one end of the first protrusion segment 710 is connected to the second protrusion segment 720 to form an arc-shaped protrusion 700.

[0052] The recessed portion 600 includes a first slot 610 and a second slot 620 that are connected to each other. A first protruding section 710 is received in the first slot 610, and a second protruding section 720 is received in the second slot 620.

[0053] It should be noted that the sidewall of the first protrusion 710 fits against the inner wall of the first slot 610, and the sidewall of the second protrusion 720 fits against the inner wall of the second slot 620, so as to ensure the stability of the connection between the protrusion 700 and the recess 600.

[0054] By setting the arc-shaped protrusion 700 and the arc-shaped recess 600, the stability of the connection between the insulating film 300 and the base plate 400 and the accuracy of the positioning are increased.

[0055] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the recess 600 is hole-shaped, and the recess 600 penetrates the bottom insulating layer 310 along the first direction Z.

[0056] The protrusion 700, with one end facing away from the base plate 400, passes through the recess 600. The protrusion 700 is positioned on the side of the bottom insulating layer 310 facing away from the base plate 400, so that the hole wall of the recess 600 provides a limiting effect on the protrusion 700. It should be noted that the hole wall of the recess 600 fits against the outer wall of the protrusion 700 to improve the stability of the connection between the protrusion 700 and the hole wall of the recess 600, thereby ensuring the stability of the connection between the base plate 400 and the insulating film 300.

[0057] like Figures 4 to 6 As shown, in some embodiments of this application, the protrusion 700 includes a connecting post 730 and an elastic limiting platform 740. The elastic limiting platform 740 is disposed on the side of the connecting post 730 away from the bottom support plate 400. The connecting post 730 is received in the recess 600. The elastic limiting platform 740 passes through the recess 600 under the action of elasticity and abuts against the side of the bottom insulating layer 310 away from the bottom support plate 400, so as to provide a limiting effect on the bottom insulating layer 310 through the elastic limiting platform 740 and the bottom support plate 400, so as to further improve the stability of the connection between the bottom support plate 400 and the insulating film 300.

[0058] It should be noted that in this embodiment, the length of the connecting post 730 along the first direction Z is equal to the depth of the recess 600 along the first direction Z, and the sidewall of the connecting post 730 fits against the hole wall of the recess 600 to ensure the stability of the connection between the connecting post 730 and the hole wall of the recess 600. This allows the side of the elastic limiting platform 740 facing the bottom support plate 400 to abut against the side of the bottom insulating layer 310 away from the bottom support plate 400, further improving the stability of the connection between the bottom support plate 400 and the insulating film 300.

[0059] It should be noted that the elastic limiting stage 740 can be an elastic silicone stage or an elastic rubber stage.

[0060] like Figure 6 As shown, in some embodiments of this application, the projection of the elastic limiting stage 740 along the first direction Z onto the plane where the bottom insulating layer 310 is located covers the recess 600.

[0061] It is understandable that the outer diameter of the elastic limiting platform 740 is larger than the inner diameter of the recess 600, so that the side of the elastic limiting platform 740 facing the bottom support plate 400 can abut against the side of the bottom insulation layer 310 away from the bottom support plate 400, thereby improving the stability of the connection between the bottom support plate 400 and the bottom insulation layer 310.

[0062] In addition, some embodiments of this application also provide a battery pack, including the single battery cells in any of the above embodiments.

[0063] It is understood that the battery pack has the beneficial effects of the individual cells in any of the above embodiments, which will not be elaborated here.

[0064] 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.

[0065] 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.

[0066] 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 having a first direction (Z), characterized in that, include: Casing (100); The top cover (500) is connected to the housing (100) along the first direction (Z); An electrode assembly (200) is disposed within the housing (100); An insulating film (300) is disposed inside the housing (100) and sleeved on the outside of the electrode assembly (200). The insulating film (300) has a bottom insulating layer (310). The bottom insulating layer (310) is disposed opposite to the top cover (500) along the first direction (Z). A first connecting portion (320) is provided on the side of the bottom insulating layer (310) away from the electrode assembly (200). A base plate (400) is disposed inside the housing (100) and on the side of the bottom insulating layer (310) away from the electrode assembly (200). The base plate (400) has a second connecting portion (410) on the side facing the bottom insulating layer (310). One of the first connecting portion (320) and the second connecting portion (410) has a recess (600), and the other of the first connecting portion (320) and the second connecting portion (410) is located in the recess (600).

2. The cell according to claim 1, wherein The first connecting portion (320) is recessed along the first direction (Z) toward the side closer to the electrode assembly (200) to form the recessed portion (600), and the second connecting portion (410) is located in the recessed portion (600).

3. The cell according to claim 1, wherein The single cell has a second direction (X) and a third direction (Y) that are mutually perpendicular to the first direction (Z). The bottom insulating layer (310) is provided with a plurality of first connecting portions (320) on the side away from the electrode assembly (200). The plurality of first connecting portions (320) are spaced apart along the second direction (X) and / or the third direction (Y). The bottom plate (400) has a plurality of second connecting parts (410) on the side facing the bottom insulating layer (310), and one first connecting part (320) is connected to one second connecting part (410).

4. The cell according to claim 3, wherein The bottom insulating layer (310) has a first wall surface (330) disposed opposite to each other along the second direction (X) and a second wall surface (340) disposed opposite to each other along the third direction (Y). The first wall surface (330) and the second wall surface (340) are connected to form a corner portion (350), and the first connecting portion (320) is adjacent to the corner portion (350).

5. The single cell according to any one of claims 1 to 4, characterized in that, The first connecting portion (320) protrudes along the first direction (Z) toward the side close to the electrode assembly (200) to form a protrusion portion (700), or the second connecting portion (410) protrudes along the first direction (Z) toward the side away from the electrode assembly (200) to form the protrusion portion (700). The protrusion (700) is at least partially housed within the recess (600).

6. The cell according to claim 5, wherein The protrusion (700) includes an intersecting first protrusion segment (710) and a second protrusion segment (720). The recess (600) includes a first slot (610) and a second slot (620) that are connected to each other. The first protrusion (710) is received in the first slot (610), and the second protrusion (720) is received in the second slot (620).

7. The cell according to claim 5, wherein The recess (600) penetrates the bottom insulating layer (310) along the first direction (Z). The protrusion (700) is inserted through the recess (600) at one end away from the bottom support plate (400) and is disposed on the side of the bottom insulating layer (310) away from the bottom support plate (400).

8. The cell according to claim 7, wherein The protrusion (700) includes a connecting post (730) and an elastic limiting platform (740). The elastic limiting platform (740) is disposed on the side of the connecting post (730) away from the bottom support plate (400). The connecting post (730) is received in the recess (600). The elastic limiting platform (740) passes through the recess (600) and abuts against the side of the bottom insulating layer (310) away from the bottom support plate (400).

9. The cell according to claim 8, wherein The projection of the elastic limiting stage (740) along the first direction (Z) onto the plane where the bottom insulating layer (310) is located covers the recess (600).

10. A battery pack, characterized by, The single cell battery includes any one of claims 1 to 9.

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