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 has a first direction, and comprises a shell, an electrode assembly and an exhaust member. The shell has a bottom wall located at one end of the shell along the first direction, and the bottom wall is provided with a through anti-explosion hole. The electrode assembly is arranged in the shell. The exhaust member is arranged in the shell and connected to the side of the bottom wall close to the electrode assembly. The exhaust member is provided with an exhaust passage penetrating along the first direction, the exhaust passage is communicated with the anti-explosion hole, the side of the exhaust member facing the bottom wall is provided with a first limiting part, and the side of the bottom wall facing the exhaust member is provided with a second limiting part connected with the first limiting part. The single battery provided by the application provides the guiding and positioning functions during the connection between the exhaust member and the bottom wall through the first limiting part and the second limiting part, so as to ensure the accuracy of the connection position of the exhaust member and the shell and improve the production and assembly efficiency of the single battery.

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] Existing battery cells are covered with an insulating film to insulate them from the outside environment. A base plate is also installed at the bottom of the cell covered with the insulating film. However, since the base plate is not fixedly connected to the casing, when the battery is shaken, the base plate, the insulating film, and the cell inside the casing will all shake. This increases the risk of electrolyte leakage between the insulating film and the cell. In particular, when the electrolyte leaks into the casing, it can easily cause a short circuit, affecting the battery's energy storage performance and lifespan. 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] This application provides the following technical solution: a single-cell battery, having a first orientation, comprising:

[0006] The housing has a bottom wall located at one end of the housing along the first direction, and the bottom wall is provided with a through explosion-proof hole;

[0007] Electrode assemblies are disposed within the housing;

[0008] An exhaust component is disposed within the housing and connected to the bottom wall on the side near the electrode assembly;

[0009] The exhaust component is provided with an exhaust channel that extends through the first direction and is connected to the explosion-proof hole. The exhaust component is provided with a first limiting part on the side facing the bottom wall, and the bottom wall is provided with a second limiting part connected to the first limiting part on the side facing the exhaust component.

[0010] In some embodiments, the single battery cell has a second direction perpendicular to the first direction, and the exhaust component is provided with a plurality of first limiting portions on the side facing the bottom wall, and the plurality of first limiting portions are arranged at intervals along the second direction;

[0011] The bottom wall is provided with a plurality of second limiting portions on the side facing the exhaust component, and the plurality of second limiting portions are arranged at intervals along the second direction.

[0012] In some embodiments, the first limiting portion is a groove, and the second limiting portion is a protrusion;

[0013] Alternatively, the first limiting part may be a protrusion, and the second limiting part may be a groove.

[0014] In some embodiments, the single cell further includes an adhesive layer located on the side of the venting member near the bottom wall and connected to the bottom wall.

[0015] In some embodiments, the exhaust component includes a first exhaust channel and a second exhaust channel; the first exhaust channel and the second exhaust channel are arranged along the second direction and are respectively connected to the explosion-proof hole; the exhaust component has a first end and a second end along the second direction; the first exhaust channel passes through the first end; and the second exhaust channel passes through the second end.

[0016] In some embodiments, the single cell has a third direction that is perpendicular to both the first and second directions;

[0017] Along the third direction, the first exhaust channel has two first walls disposed opposite to each other, and the second exhaust channel has two second walls disposed opposite to each other;

[0018] The first wall surface is provided with a plurality of first guide protrusions, which are arranged at intervals along the second direction. The second wall surface is provided with a plurality of second guide protrusions, which are arranged at intervals along the second direction.

[0019] In some embodiments, a plurality of the first guide protrusions are staggered along the third direction, and the first guide protrusions have a first guide surface, which is angled to the first wall surface;

[0020] Multiple second guide protrusions are staggered along the third direction, each second guide protrusion having a second guide surface, which is angled to the second wall surface.

[0021] In some embodiments, the bottom wall is provided with an explosion-proof valve, which covers the explosion-proof hole.

[0022] In some embodiments, an insulating layer is provided between the exhaust element and the electrode assembly, and the insulating layer is sleeved on the electrode assembly.

[0023] Secondly, this application provides a battery pack including the aforementioned single battery cell.

[0024] The embodiments of this application have the following advantages: by providing a first limiting part on the side of the exhaust component facing the bottom wall and a second limiting part on the side of the bottom wall facing the exhaust component, the first and second limiting parts provide guidance and positioning during the connection between the exhaust component and the bottom wall, thereby ensuring the accuracy and stability of the connection position between the exhaust component and the housing, thus ensuring the stability of the electrode assembly in the cavity and improving the production and assembly efficiency of the single cell.

[0025] 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

[0026] 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.

[0027] Figure 1 An exploded view of a single-cell battery provided by some embodiments of this application is shown;

[0028] Figure 2 An exploded view of the venting device and casing in a single-cell battery provided by some embodiments of the application is shown.

[0029] Figure 3 An exploded schematic diagram from another perspective is shown of an embodiment of the application providing an exhaust component and casing in a single-cell battery.

[0030] Figure 4 The illustration shows a partial schematic diagram from one perspective of one embodiment of an exhaust device in a single-cell battery provided by some embodiments of the application.

[0031] Explanation of key component symbols:

[0032] 100-Housing; 110-Bottom wall; 111-Second limiting part; 112-Explosion-proof hole; 200-Electrode assembly; 300-Insulating layer; 400-Exhaust component; 410-First limiting part; 420-Exhaust channel; 421-First exhaust channel; 4211-First wall surface; 4212-First guide protrusion; 4213-First guide surface; 422-Second exhaust channel; 4221-Second wall surface; 4222-Second guide protrusion; 4223-Second guide surface; 430-First end; 440-Second end; 500-Explosion-proof valve; 600-End cap; 700-Adhesive layer.

[0033] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] like Figures 1 to 3As shown, some embodiments of this application provide a single cell battery. The single cell battery has a first direction X, which is mainly used to ensure the accuracy and stability of the connection position between the exhaust component 400 and the housing 100, thereby ensuring the stability of the electrode assembly 200 in the receiving cavity and improving the production and assembly efficiency of the single cell battery.

[0040] The single cell includes a casing 100, an electrode assembly 200, and an exhaust component 400.

[0041] The housing 100 has a bottom wall 110 located at one end of the housing 100 along the first direction X. The bottom wall 110 is provided with a through explosion-proof hole 112, that is, the explosion-proof hole 112 penetrates the bottom wall 110 along the first direction X.

[0042] The electrode assembly 200 is disposed within the housing 100 to provide protection and limit the electrode assembly 200 through the housing 100, so as to ensure the stability of the electrode assembly 200 within the housing 100. It is understood that the gas generated by the electrode assembly 200 during operation can be discharged through the explosion-proof hole 112.

[0043] An exhaust component 400 is disposed within the housing 100 and is connected to the bottom wall 110 on the side near the electrode assembly 200. That is, the exhaust component 400 is disposed between the electrode assembly 200 and the bottom wall 110, so that the exhaust component 400 is limited along the first direction X by the electrode assembly 200 and the bottom wall 110, and is also limited along the direction perpendicular to the first direction X by the inner wall of the housing 100, so as to ensure the stability of the exhaust component 400 within the housing 100.

[0044] In this embodiment, the exhaust component 400 is provided with an exhaust channel 420 extending along the first direction X. The exhaust channel 420 is connected to the explosion-proof hole 112 so that the gas generated by the electrode assembly 200 can be guided to the explosion-proof hole 112 through the exhaust channel 420. That is, the exhaust channel 420 provides a guiding function for the gas, thereby improving the exhaust efficiency.

[0045] The exhaust component 400 has a first limiting part 410 on the side facing the bottom wall 110, and the bottom wall 110 has a second limiting part 111 connected to the first limiting part 410 on the side facing the exhaust component 400. The first limiting part 410 is connected to the second limiting part 111, thereby connecting the exhaust component 400 and the bottom wall 110 to improve the connection and assembly efficiency between the exhaust component 400 and the bottom wall 110.

[0046] It should be noted that the connection method between the first limiting part 410 and the second limiting part 111 includes at least one of snap-fit, adhesive, interference fit, and sleeve, which can be specifically set according to the actual situation.

[0047] This application provides a first limiting part 410 on the side of the exhaust component 400 facing the bottom wall 110 and a second limiting part 111 on the side of the bottom wall 110 facing the exhaust component 400. The first limiting part 410 and the second limiting part 111 provide guidance and positioning during the connection between the exhaust component 400 and the bottom wall 110, thereby ensuring the accuracy and stability of the connection position between the exhaust component 400 and the housing 100, thus ensuring the stability of the electrode assembly 200 in the receiving cavity and improving the production and assembly efficiency of the single cell.

[0048] like Figure 3 As shown, in some embodiments of this application, the single battery cell has a second direction Y that is perpendicular to the first direction X, and the exhaust member 400 is provided with a plurality of first limiting portions 410 on the side facing the bottom wall 110, and the plurality of first limiting portions 410 are arranged at intervals along the second direction Y.

[0049] It is understandable that the number of first limit units 410 can be any number of two or more values, and can be specifically set according to the actual situation.

[0050] In some embodiments, the exhaust member 400 is provided with two first limiting portions 410 on the side facing the bottom wall 110, one of the first limiting portions 410 is provided at one end of the exhaust member 400 along the second direction Y, and the other first limiting portion is provided at the other end of the exhaust member 400 along the second direction Y.

[0051] The bottom wall 110 has a plurality of second limiting portions 111 on the side facing the exhaust member 400, and the plurality of second limiting portions 111 are arranged at intervals along the second direction Y. It can be understood that the number of second limiting portions 111 can be any number of two or more values, and can be specifically set according to the actual situation.

[0052] It should be noted that the number of first limiting parts 410 and the number of second limiting parts 111 are equal, and one first limiting part 410 is connected to one second limiting part 111.

[0053] In some embodiments, there are two second limiting parts 111. By providing two first limiting parts 410 and two second limiting parts 111, not only can the stability of the connection between the exhaust component 400 and the bottom wall 110 be guaranteed, but also the processing steps of the exhaust component 400 and the bottom wall 110 can be reduced, thereby improving the production efficiency of the exhaust component 400 and saving costs.

[0054] like Figure 3As shown, in some embodiments of this application, the first limiting part 410 is a groove and the second limiting part 111 is a protrusion. By engaging the protrusion with the groove and connecting the first limiting part 410 and the second limiting part 111, the bottom wall 110 and the exhaust component 400 are connected.

[0055] In other embodiments, the first limiting portion 410 is a protrusion and the second limiting portion 111 is a groove.

[0056] It should be noted that, along the first direction X, the height of the protrusion and the depth of the groove are equal, so that the side of the exhaust component 400 facing the bottom wall 110 fits against the side of the bottom wall 110 facing the exhaust component 400. This not only improves the stability of the connection between the exhaust component 400 and the bottom wall 110, but also improves the space utilization rate inside the housing 100 and ensures the energy density of the electrode assembly 200.

[0057] like Figure 4 As shown, in some embodiments of this application, the single battery cell further includes an adhesive layer 700, which is located on the side of the venting component 400 near the bottom wall 110 and is connected to the bottom wall 110. The adhesive layer 700 connects the venting component 400 and the bottom wall 110, thereby further improving the stability of the connection between the venting component 400 and the bottom wall 110.

[0058] In some embodiments, the projection of the adhesive layer 700 along the first direction X onto the side of the exhaust member 400 facing the bottom wall 110 coincides with the exhaust member 400. That is, by increasing the coverage area of ​​the adhesive layer 700 on the exhaust member 400, the bonding area between the exhaust member 400 and the bottom wall 110 is increased. It is understood that a larger bonding area results in higher stability of the connection between the exhaust member 400 and the bottom wall 110.

[0059] In other embodiments, an adhesive layer 700 is provided on a portion of the side of the exhaust member 400 facing the bottom wall 110, and adhesive layers 700 are respectively provided at both ends of the exhaust member 400 along the second direction Y. It is understood that by providing adhesive layers 700 at both ends of the exhaust member 400, not only can the stability of the connection between the exhaust member 400 and the bottom wall 110 be ensured, but the connection cost between the exhaust member 400 and the bottom wall 110 can also be reduced by reducing the area of ​​the adhesive layer 700.

[0060] like Figure 2 and Figure 3As shown, in some embodiments of this application, the exhaust component 400 includes a first exhaust channel 421 and a second exhaust channel 422. The first exhaust channel 421 and the second exhaust channel 422 are arranged along the second direction Y, and the first exhaust channel 421 and the second exhaust channel 422 are respectively connected to the explosion-proof hole 112, so that the gas generated during the operation of the electrode assembly 200 can be guided to the explosion-proof hole 112 through the first exhaust channel 421 and the second exhaust channel 422 respectively, thereby allowing the gas to be discharged from the explosion-proof hole 112 and improving the exhaust efficiency.

[0061] In this embodiment, the exhaust component 400 has a first end 430 and a second end 440 along the second direction Y. A first exhaust channel 421 passes through the first end 430, and a second exhaust channel 422 passes through the second end 440, so that the gas generated during the operation of the electrode assembly 200 can enter the first exhaust channel 421 through the first end 430 and enter the second exhaust channel 422 through the second end 440. Thus, the gas is guided to the explosion-proof hole 112 through the first exhaust channel 421 and the second exhaust channel 422 respectively, so that the gas is discharged from the explosion-proof hole 112.

[0062] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the single cell has a third direction Z that is mutually perpendicular to both the first direction X and the second direction Y.

[0063] Along the third direction Z, the first exhaust channel 421 has two oppositely arranged first walls 4211. The first walls 4211 are provided with a plurality of first guide protrusions 4212. The plurality of first guide protrusions 4212 are arranged at intervals along the second direction Y to provide a guiding effect on the gas flowing through the first exhaust channel 421, so that the gas can flow from the first end 430 to the second end 440 in the first exhaust channel 421. This allows the gas entering the first exhaust channel 421 to flow from the first end 430 to the explosion-proof hole 112 and be discharged from the explosion-proof hole 112, thereby improving the smoothness of the gas flow in the first exhaust channel 421 and improving the exhaust efficiency.

[0064] Along the third direction Z, the second exhaust channel 422 has two opposing second walls 4221. The second walls 4221 are provided with a plurality of second guide protrusions 4222. The second guide protrusions 4222 are arranged at intervals along the second direction Y to guide the gas flowing through the second exhaust channel 422, so that the gas can flow from the second end 440 to the first end 430 in the second exhaust channel 422. This allows the gas entering the second exhaust channel 422 to flow from the second end 440 to the explosion-proof hole 112 and be discharged from the explosion-proof hole 112, thereby improving the smoothness of the gas flow in the second exhaust channel 422 and improving the exhaust efficiency.

[0065] like Figure 3 As shown, in some embodiments of this application, a plurality of first guide protrusions 4212 are staggered along the third direction Z. The first guide protrusions 4212 provide guidance for the gas flowing through the first exhaust channel 421, while ensuring the uniformity of the spacing between the two oppositely arranged first wall surfaces 4211. This ensures the smoothness and stability of the gas flow in the first exhaust channel 421 and improves the gas guiding efficiency of the first exhaust channel 421.

[0066] The first guide protrusion 4212 has a first guide surface 4213. The first guide surface 4213 is oriented towards the first exhaust channel 421 in the third direction Z. The first guide surface 4213 is set at an angle to the first wall surface 4211 so as to guide the gas flowing through the first exhaust channel 421 through the first guide surface 4213, so that the gas entering the first exhaust channel 421 flows from the first end 430 to the second end 440 under the guidance of the first guide surface 4213.

[0067] In addition, multiple second guide protrusions 4222 are staggered along the third direction Z. The second guide protrusions 4222 provide guidance for the gas flowing through the second exhaust channel 422, while ensuring the uniformity of the spacing between the two oppositely arranged second wall surfaces 4221. This ensures the smoothness and stability of the gas flow in the second exhaust channel 422 and improves the gas guiding efficiency of the second exhaust channel 422.

[0068] In this embodiment, the second guide protrusion 4222 has a second guide surface 4223. The second guide surface 4223 is oriented towards the second exhaust channel 422 in a third direction Z. The second guide surface 4223 is set at an angle to the second wall surface 4221 so as to guide the gas flowing through the second exhaust channel 422 through the second guide surface 4223, so that the gas entering the second exhaust channel 422 flows from the second end 440 to the first end 430 under the guidance of the second guide surface 4223.

[0069] like Figure 1 As shown, in some embodiments of this application, the bottom wall 110 is provided with an explosion-proof valve 500, which covers the explosion-proof hole 112 to control the internal pressure of the individual battery and thus prevent the individual battery from exploding.

[0070] When excessive pressure is generated inside a single cell, the explosion-proof valve 500 will open under pressure, thereby releasing the high-pressure gas generated inside the single cell into the external environment, thus reducing the internal pressure of the single cell and effectively preventing the risk of single cell explosion.

[0071] like Figure 1 As shown, in some embodiments of this application, an insulating layer 300 is provided between the exhaust component 400 and the electrode assembly 200. The insulating layer 300 is disposed inside the housing 100 and sleeved on the electrode assembly 200. The insulating layer 300 forms an insulating barrier between the housing 100 and the electrode assembly 200 to prevent the electrode assembly 200 from contacting the housing 100 and causing a short circuit.

[0072] like Figure 1 As shown, in some embodiments of this application, the single cell also includes an end cap 600, which is disposed on the other side of the housing 100 along the first direction X, that is, the end cap 600 and the bottom wall 110 are respectively disposed on two opposite sides of the housing 100.

[0073] In addition, some embodiments of this application also provide a battery pack, including the single battery cells in any of the above embodiments.

[0074] It is understood that the battery pack has the beneficial effects of the single cell described in any of the above embodiments, which will not be elaborated here.

[0075] 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.

[0076] 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.

[0077] 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 a first orientation (X), characterized in that, include: The housing (100) has a bottom wall (110) located at one end of the housing (100) along the first direction (X), and the bottom wall (110) is provided with a through explosion-proof hole (112). An electrode assembly (200) is disposed within the housing (100); An exhaust component (400) is disposed within the housing (100) and connected to the bottom wall (110) on the side near the electrode assembly (200); The exhaust component (400) is provided with an exhaust channel (420) extending along the first direction (X), the exhaust channel (420) is connected to the explosion-proof hole (112), the exhaust component (400) is provided with a first limiting part (410) on the side facing the bottom wall (110), and the bottom wall (110) is provided with a second limiting part (111) connected to the first limiting part (410) on the side facing the exhaust component (400).

2. The single-cell battery according to claim 1, characterized in that, The single cell has a second direction (Y) perpendicular to the first direction (X), and the exhaust member (400) is provided with a plurality of first limiting parts (410) on the side facing the bottom wall (110), and the plurality of first limiting parts (410) are arranged at intervals along the second direction (Y). The bottom wall (110) is provided with a plurality of second limiting portions (111) on the side facing the exhaust component (400), and the plurality of second limiting portions (111) are arranged at intervals along the second direction (Y).

3. The single-cell battery according to claim 2, characterized in that, The first limiting part (410) is a groove, and the second limiting part (111) is a protrusion; Alternatively, the first limiting part (410) may be a protrusion, and the second limiting part (111) may be a groove.

4. The single-cell battery according to claim 2, characterized in that, The single cell also includes an adhesive layer located on the side of the vent (400) near the bottom wall (110) and connected to the bottom wall (110).

5. The single-cell battery according to any one of claims 2 to 4, characterized in that, The exhaust channel (420) includes a first exhaust channel (421) and a second exhaust channel (422); the first exhaust channel (421) and the second exhaust channel (422) are arranged along the second direction (Y) and are respectively connected to the explosion-proof hole (112). The exhaust component (400) has a first end (430) and a second end (440) along the second direction (Y). The first exhaust channel (421) passes through the first end (430), and the second exhaust channel (422) passes through the second end (440).

6. The single-cell battery according to claim 5, characterized in that, The single cell has a third direction (Z) that is mutually perpendicular to the first direction (X) and the second direction (Y); Along the third direction (Z), the first exhaust passage (421) has a first wall (4211) disposed opposite to each other, and the second exhaust passage (422) has a second wall (4221) disposed opposite to each other. The first wall surface (4211) is provided with a plurality of first guide protrusions (4212), which are arranged at intervals along the second direction (Y). The second wall surface (4221) is provided with a plurality of second guide protrusions (4222), which are arranged at intervals along the second direction (Y).

7. The single-cell battery according to claim 6, characterized in that, Multiple first guide protrusions (4212) are staggered along the third direction (Z), and each first guide protrusion (4212) has a first guide surface (4213), which is angled to the first wall surface (4211). Multiple second guide protrusions (4222) are staggered along the third direction (Z), and each second guide protrusion (4222) has a second guide surface (4223) which is angled to the second wall surface (4221).

8. The single-cell battery according to claim 1, characterized in that, The bottom wall is provided with an explosion-proof valve (500), which covers the explosion-proof hole (112).

9. The single-cell battery according to claim 1, characterized in that, An insulating layer (300) is provided between the exhaust component (400) and the electrode assembly (200), and the insulating layer (300) is sleeved on the electrode assembly (200).

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

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