Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, and relates to the field of batteries. The single battery comprises a shell, a first end cover, a pole, a second end cover, an electrode assembly and an exhaust supporting piece, the shell is provided with an accommodating cavity; the first end cover is connected with the shell in the third direction and covers the containing cavity. The pole penetrates through the first end cover; the second end cover is connected with the shell in the third direction and covers the containing cavity, the second end cover is arranged opposite to the first end cover in the third direction, and the second end cover is provided with an anti-explosion valve; the electrode assembly is arranged in the accommodating cavity and is connected with the pole; the exhaust supporting piece abuts against the electrode assembly and the second end cover, an exhaust hole penetrating in the third direction is formed in the exhaust supporting piece and corresponds to the anti-explosion valve, an exhaust groove is formed in the side, close to the second end cover, of the exhaust supporting piece, and the exhaust groove is communicated with the exhaust hole. According to the single battery provided by the invention, the exhaust efficiency is improved, and the risk of explosion of the single battery is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a single battery and a battery pack. BACKGROUND

[0002] With the continuous development of the new energy vehicle industry, the energy density and safety of batteries are increasingly required by current new energy vehicles. In order to improve the safety of new energy vehicles, the current batteries usually adopt a thermal-electric separation scheme with the pole column facing upward and the explosion-proof valve facing downward.

[0003] Supporting members are often used in batteries to separate the bottom wall of the battery from the internal electrode assembly; when the battery adopts the thermal-electric separation scheme with the pole column facing upward and the explosion-proof valve facing downward, the electrode assembly presses the supporting member due to its own gravity, which causes the supporting member to press the bottom wall of the battery, which easily causes the explosion-proof valve to be blocked by the supporting member, thereby reducing the exhaust efficiency, causing the exhaust rate to be less than the gas production rate after the battery thermal runaway, causing the internal pressure of the battery to continuously rise, and ultimately causing the battery to explode, affecting the safety performance of the new energy vehicle. UTILITY MODEL CONTENT

[0004] To achieve the above-mentioned purpose, the present application has the purpose of providing a single battery, which aims to solve the technical problem that the explosion-proof valve is easily blocked by the supporting member in the prior art, thereby reducing the exhaust efficiency and causing the battery to easily explode.

[0005] The technical scheme adopted is as follows:

[0006] In a first aspect, the embodiments of the present application provide a single battery, the single battery has a third direction, and the single battery comprises:

[0007] A housing having a containing cavity;

[0008] A first end cover connected to the housing along the third direction and covering the containing cavity;

[0009] A pole column provided in the first end cover;

[0010] A second end cover connected to the housing along the third direction and covering the containing cavity, the second end cover is arranged opposite to the first end cover along the third direction, and the second end cover is provided with an explosion-proof valve;

[0011] An electrode assembly arranged in the containing cavity and connected to the pole column;

[0012] An exhaust support is arranged in the accommodating cavity, and is arranged between the electrode assembly and the second end cover along the third direction and abuts against the electrode assembly and the second end cover respectively. The exhaust support is provided with an exhaust hole penetrating along the third direction, and the exhaust hole corresponds to the explosion-proof valve. An exhaust groove is arranged on the side of the exhaust support close to the second end cover, and the exhaust groove is communicated with the exhaust hole.

[0013] In one of the embodiments of the first aspect, the second end cover is arranged in a protruding manner along the third direction away from the electrode assembly, so that a groove is formed on the side of the second end cover facing the electrode assembly, and the groove is communicated with the exhaust hole.

[0014] In one of the embodiments of the first aspect, the monomer battery further has a first direction intersecting the third direction, and the exhaust groove includes a first exhaust groove extending along the first direction from the edge of the exhaust support and communicated with the exhaust hole.

[0015] In one of the embodiments of the first aspect, the monomer battery further has a second direction intersecting the third direction, and the exhaust groove further includes a second exhaust groove extending along the second direction from the edge of the exhaust support and communicated with the exhaust hole.

[0016] In one of the embodiments of the first aspect, the second exhaust groove is arranged in multiple groups, and each group of the second exhaust groove includes multiple second exhaust grooves arranged in the first direction.

[0017] In one of the embodiments of the first aspect, the exhaust support is provided with an exhaust groove on the side away from the second end cover; and the first exhaust groove and the second exhaust groove are arranged on two opposite sides of the exhaust support along the third direction.

[0018] In one of the embodiments of the first aspect, along the direction of the exhaust support close to the second end cover, the groove widths of the first exhaust groove and the second exhaust groove gradually increase.

[0019] In one of the embodiments of the first aspect, the first exhaust groove is arranged in multiple groups, and each group of the first exhaust groove is arranged in the first direction.

[0020] In one of the embodiments of the first aspect, the monomer battery further includes an insulation layer arranged in the accommodating cavity, the insulation layer wraps the electrode assembly, and the exhaust support is connected to the insulation layer in a heat fusion manner.

[0021] In a second aspect, the embodiments of the present application also provide a battery pack comprising the single battery as described in any of the above embodiments.

[0022] The beneficial effects of the present application are: the present application provides a single battery, by arranging the exhaust support between the electrode assembly and the second end cover along the third direction, and abutting with the electrode assembly and the second end cover respectively, and arranging the exhaust hole penetrating along the third direction on the exhaust support, the exhaust hole corresponds to the explosion-proof valve, so that part of the high-temperature gas generated when the electrode assembly is in thermal runaway can be quickly discharged through the exhaust hole through the explosion-proof valve, and opening the exhaust hole can also play the role of avoiding the explosion-proof valve, avoiding the contact between the exhaust support and the explosion-proof valve to block the explosion-proof valve, effectively improving the exhaust efficiency and reducing the risk of explosion of the single battery. By arranging the exhaust groove communicating with the exhaust hole on the side of the exhaust support close to the second end cover, so that another part of the high-temperature gas generated when the electrode assembly is in thermal runaway can be quickly discharged to the exhaust hole through the exhaust groove in turn, and then discharged through the explosion-proof valve through the exhaust hole, the exhaust groove can play the effect of shunting, further improving the exhaust efficiency and further reducing the risk of explosion of the single battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0024] Figure 1 An explosion schematic diagram of the single battery in some embodiments of the present application is shown;

[0025] Figure 2 A bottom view schematic diagram of the exhaust support in some embodiments of the present application is shown;

[0026] Figure 3 A front view schematic diagram of the exhaust support in some embodiments of the present application is shown;

[0027] Figure 4 A side view schematic diagram of the exhaust support in some embodiments of the present application is shown.

[0028] Main element symbol explanation:

[0029] 100-single battery;

[0030] 110-housing; 111-receiving cavity;

[0031] 121-first end cover; 1211-pole; 122-second end cover; 1221-explosion-proof valve; 1222-groove； ;

[0032] 130 - electrode assembly;

[0033] 140 - exhaust support; 141 - exhaust hole; 142 - exhaust groove; 1421 - first exhaust groove; 1422 - second exhaust groove;

[0034] 150 - insulation layer;

[0035] X - first direction;

[0036] Y - second direction;

[0037] Z - third direction. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein like or similar elements are denoted by like or similar reference symbols throughout the drawings. The embodiments described below are examples only, and are not intended to limit the present application.

[0039] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0040] In addition, the terms "first", "second", "third", etc. are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0041] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like, should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] As shown in Figure 1 Embodiments of the present application provide a single battery 100, mainly applied to a battery pack. The single battery 100 has a third direction Z, and the single battery 100 comprises a shell 110, a first end cover 121, a pole 1211, a second end cover 122, an electrode assembly 130 and an exhaust support 140.

[0044] The shell 110 has a containing cavity 111, the first end cover 121 is connected with the shell 110 along the third direction Z, so that the first end cover 121 is sealed in the containing cavity 111, and the pole 1211 is provided in the first end cover 121. The second end cover 122 is connected with the shell 110 along the third direction Z, so that the second end cover 122 is sealed in the containing cavity 111, the second end cover 122 is arranged opposite to the first end cover 121 along the third direction Z, the second end cover 122 is provided with an explosion-proof valve 1221, the electrode assembly 130 is arranged in the containing cavity and connected with the pole 1211.

[0045] The exhaust support 140 is arranged in the containing cavity 111, the exhaust support 140 is arranged between the electrode assembly 130 and the second end cover 122 along the third direction Z, and abuts with the electrode assembly 130 and the second end cover 122 respectively, the exhaust support 140 is provided with an exhaust hole 141 penetrating along the third direction Z, the exhaust hole 141 corresponds to the explosion-proof valve 1221, and the exhaust support 140 is provided with an exhaust groove 142 on the side close to the second end cover 122, and the exhaust groove 142 communicates with the exhaust hole 141.

[0046] The single battery 100 provided by the embodiment of the present application can effectively improve the exhaust efficiency and reduce the risk of explosion of the single battery 100 by arranging the exhaust support 140 between the electrode assembly 130 and the second end cover 122 along the third direction Z, abutting the electrode assembly 130 and the second end cover 122 respectively, and arranging the exhaust hole 141 penetrating along the third direction Z on the exhaust support 140, so that part of the high-temperature gas generated when the electrode assembly 130 is in thermal runaway can be quickly exhausted through the exhaust hole 141 and the explosion-proof valve 1221, and the exhaust hole 141 can also play a role in avoiding the explosion-proof valve 1221, avoiding the contact between the exhaust support 140 and the explosion-proof valve 1221 to block the explosion-proof valve 1221.

[0047] The exhaust groove 142 is located on the side of the exhaust support 140 close to the second end cover 122, which can prevent the insulating layer 150 outside the electrode assembly 130 from blocking the exhaust groove 142, and effectively improve the exhaust efficiency.

[0048] Specifically, the exhaust support 140 has a gap between the cavity wall of the accommodating cavity 111, and the exhaust groove 142 is arranged on the side of the exhaust support 140 close to the second end cover 122 and communicates with the exhaust hole 141, so that another part of the high-temperature gas generated when the electrode assembly 130 is in thermal runaway can be quickly exhausted to the exhaust hole 141 through the gap and the exhaust groove 142 in turn, and then exhausted through the exhaust hole 141 and the explosion-proof valve 1221. The exhaust groove 142 can play a shunt effect, further improve the exhaust efficiency, and further reduce the risk of explosion of the single battery 100.

[0049] As shown in the drawings, Figure 1 In one embodiment of the present application, the second end cover 122 is arranged in a protruding manner along the third direction Z away from the electrode assembly 130, so that a groove 1222 is formed on the side of the second end cover 122 facing the electrode assembly 130, and the groove 1222 communicates with the exhaust hole 141.

[0050] In the embodiment, the second end cover 122 is arranged in a protruding manner along the third direction Z away from the electrode assembly 130, so that a groove 1222 is formed on the side of the second end cover 122 facing the electrode assembly 130, and the groove 1222 communicates with the exhaust hole 141. In this way, when the electrode assembly 130 is in thermal runaway, the existence of the groove 1222 not only avoids the area of the exhaust support 140 blocking the explosion-proof valve 1221, but also increases the exhaust space, which is beneficial to the more rapid exhaust of the high-temperature gas and reduces the risk of explosion as much as possible.

[0051] As shown in the drawings, Figure 2 , Figure 3 and Figure 4As shown, in one embodiment of this application, the single cell 100 also has a first direction X intersecting with the third direction Z, and the exhaust groove 142 includes a first exhaust groove 1421, which extends from the edge of the exhaust support 140 along the first direction X and communicates with the exhaust hole 141.

[0052] In this embodiment, by extending the first exhaust groove 1421 from the edge of the exhaust support 140 along the first direction X and connecting it with the exhaust hole 141, the high-temperature gas on both sides of the electrode assembly 130 along the first direction X can be quickly discharged to the exhaust hole 141 through the gap and the first exhaust groove 1421 in sequence, and then quickly discharged through the explosion-proof valve 1221 via the exhaust hole 141, which effectively improves the exhaust efficiency and reduces the risk of explosion of the single cell battery 100.

[0053] like Figure 2 , Figure 3 and Figure 4 As shown in the above embodiments of this application, the single cell 100 also has a second direction Y intersecting with the third direction Z, and the exhaust groove 142 further includes a second exhaust groove 1422. The second exhaust groove 1422 extends from the edge of the exhaust support member 140 along the second direction Y and communicates with the exhaust hole 141.

[0054] In this embodiment, by extending the second exhaust groove 1422 from the edge of the exhaust support 140 along the second direction Y and connecting it with the exhaust hole 141, the high-temperature gas on both sides of the electrode assembly 130 along the second direction Y can be quickly discharged to the exhaust hole 141 through the gap and the second exhaust groove 1422 in sequence, and then quickly discharged through the explosion-proof valve 1221 via the exhaust hole 141, which effectively improves the exhaust efficiency and reduces the risk of explosion of the single cell battery 100.

[0055] like Figure 1 and Figure 2 As shown in the above embodiments of this application, multiple sets of second exhaust grooves 1422 are provided. The multiple sets of second exhaust grooves 1422 are arranged opposite to each other along the second direction Y. Each set of second exhaust grooves 1422 includes multiple second exhaust grooves 142, and the multiple second exhaust grooves 142 are arranged at intervals along the first direction X.

[0056] In the embodiment, by setting the number of the second exhaust grooves 1422 as multiple groups, and oppositely arranging the multiple groups of the second exhaust grooves 1422 along the second direction Y, the high-temperature gas generated at one side of the electrode assembly 130 along the second direction Y can be quickly exhausted to the exhaust hole 141 through one group of the second exhaust grooves 1422, and then quickly exhausted to the outside through the explosion-proof valve 1221 via the exhaust hole 141; and the high-temperature gas generated at the other side of the electrode assembly 130 along the second direction Y can be quickly exhausted to the exhaust hole 141 through the other group of the second exhaust grooves 1422, and then quickly exhausted to the outside through the explosion-proof valve 1221 via the exhaust hole 141, which effectively improves the exhaust efficiency and reduces the risk of explosion of the single battery 100.

[0057] Meanwhile, by setting each group of the second exhaust grooves 1422 to include multiple second exhaust grooves 1422 arranged at intervals along the first direction X, the exhaust area of the second exhaust grooves 1422 is increased, thereby further improving the exhaust efficiency and further reducing the risk of explosion of the single battery 100.

[0058] For example, the first exhaust grooves 1421 and the second exhaust grooves 1422 can be arranged on the same side of the exhaust support 140 along the third direction Z. In other embodiments, the first exhaust grooves 1421 and the second exhaust grooves 1422 can be arranged on two opposite sides of the exhaust support 140 along the third direction Z, respectively.

[0059] In the above embodiments of the present application, the side of the exhaust support 140 away from the second end cover 122 is provided with the exhaust grooves 142; the first exhaust grooves 1421 and the second exhaust grooves 1422 are arranged on two opposite sides of the exhaust support 140 along the third direction Z, respectively.

[0060] In the embodiment, the side of the exhaust support 140 away from the second end cover 122 is also provided with the exhaust grooves 142, and the first exhaust grooves 1421 and the second exhaust grooves 1422 are arranged on two opposite sides of the exhaust support 140 along the third direction Z, respectively. In this way, the high-temperature gas generated at both sides of the electrode assembly 130 along the first direction X can be quickly exhausted to the exhaust hole 141 along the first exhaust grooves 1421 arranged on one side of the exhaust support 140 along the third direction Z, and then quickly exhausted to the outside through the explosion-proof valve 1221 via the exhaust hole 141. And the high-temperature gas generated at both sides of the electrode assembly 130 along the second direction Y can be quickly exhausted to the exhaust hole 141 along the second exhaust grooves 1422 arranged on the other side of the exhaust support 140 along the third direction Z, and then quickly exhausted to the outside through the explosion-proof valve 1221 via the exhaust hole 141. In this way, the high-temperature gas is more beneficially divided, thereby maximizing the exhaust efficiency and minimizing the risk of explosion of the single battery 100.

[0061] For example, Figure 3 and Figure 4As shown in the above embodiments of this application, along the direction of the exhaust support 140 near the second end cover 122, the width of the first exhaust groove 1421 and the second exhaust groove 1422 gradually increases.

[0062] In this embodiment, by setting the width of the first exhaust groove 1421 and the second exhaust groove 1422 to gradually increase along the direction of the exhaust support 140 near the second end cover 122, the exhaust area of ​​the first exhaust groove 1421 and the second exhaust groove 1422 is increased, which helps to improve the exhaust efficiency and reduce the risk of explosion of the single cell battery 100.

[0063] like Figure 1 and Figure 2 As shown in the above embodiments of this application, a plurality of first exhaust grooves 1421 are provided, and the plurality of first exhaust grooves 1421 are respectively arranged opposite to each other along the first direction X.

[0064] In this embodiment, by setting the number of first exhaust channels 1421 to multiple, and arranging the multiple first exhaust channels 1421 opposite to each other along the first direction X, the high-temperature gas generated on one side of the electrode assembly 130 along the first direction X can be quickly discharged to the exhaust port 141 through one of the first exhaust channels 1421, and then quickly discharged through the explosion-proof valve 1221 via the exhaust port 141. Furthermore, the high-temperature gas generated on the other side of the electrode assembly 130 along the first direction X can be quickly discharged to the exhaust port 141 through the other first exhaust channel 1421, and then quickly discharged through the explosion-proof valve 1221 via the exhaust port 141, effectively improving exhaust efficiency and reducing the risk of explosion of the single battery 100.

[0065] In one embodiment of this application, the second end cap 122 is provided with a first positioning hole, which penetrates the second end cap 122 in a third direction Z. The exhaust support 140 is provided with a first positioning post that cooperates with the first positioning hole on the side away from the electrode assembly 130.

[0066] In this embodiment, a first positioning hole is opened in the second end cover 122 along the third direction Z, penetrating the second end cover 122. A first positioning post is provided on the side of the exhaust support 140 away from the electrode assembly 130, which cooperates with the first positioning hole. Under the cooperation of the first positioning hole and the first positioning post, the exhaust support 140 is stably and accurately positioned on the side of the second end cover 122 close to the electrode assembly 130, so as to avoid the exhaust support 140 from being displaced relative to the second end cover 122 and affecting the exhaust efficiency.

[0067] like Figure 1As shown, in one embodiment of the present application, the single battery cell 100 further comprises an insulation layer 150, which is arranged in the accommodating cavity 111 and wraps the electrode assembly 130, and the exhaust support 140 is heat-fusedly connected with the insulation layer 150. The exhaust support 140 and the insulation layer 150 abut at one end along the third direction Z and are heat-fusedly connected together.

[0068] In the present embodiment, the insulation layer is arranged in the accommodating cavity 111 and wraps the electrode assembly 130 to play an insulation protection role for the electrode assembly 130, avoiding the technical problem of short circuit caused by the contact between the electrode assembly 130 and the exhaust support 140 or the shell 110.

[0069] Meanwhile, the exhaust support 140 is heat-fusedly connected with the insulation layer 150 to make the exhaust support 140 stably and accurately abut at the side of the electrode assembly 130 close to the second end cover 122, avoiding the displacement of the exhaust support 140 relative to the electrode assembly 130 or the second end cover 122 to affect the exhaust efficiency.

[0070] It can be understood that the exhaust support 140 is provided with a second positioning hole penetrating therethrough along the third direction Z, and the side of the insulation layer 150 close to the second end cover 122 is provided with a second positioning column matched with the second positioning hole, and the second positioning column is heat-fusedly connected with the exhaust support 140 after being penetrated into the second positioning hole, so as to make the exhaust support 140 stably and accurately abut at the side of the electrode assembly 130 close to the second end cover 122 under the heat-fused connection, avoiding the displacement of the exhaust support 140 relative to the electrode assembly 130 or the second end cover 122 to affect the exhaust efficiency.

[0071] For example, the insulation layer 150 and the second positioning column can be integrally formed by injection molding or heat-fusedly connected.

[0072] The embodiments of the present application also provide a battery pack comprising the single battery cell 100 in any of the above embodiments.

[0073] The battery pack has the single battery cell 100 in any of the above embodiments, and thus has all the beneficial effects of the single battery cell 100, which will not be repeated here.

[0074] The battery pack has a box body and at least one single battery cell 100 as in any of the above embodiments, and the single battery cell 100 is arranged in the box body. When there are multiple single battery cells 100, the multiple single battery cells 100 can be connected in series or in parallel, or in a combination of series and parallel connection.

[0075] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0076] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A single-cell battery, said single-cell battery (100) having a third orientation (Z), characterized in that, The single cell (100) includes: A housing (110) having a receiving cavity (111); The first end cap (121) is connected to the housing (110) along the third direction (Z) and seals the receiving cavity (111); The pole post (1211) is inserted through the first end cap (121); The second end cap (122) is connected to the housing (110) along the third direction (Z) and seals the receiving cavity (111). The second end cap (122) is disposed opposite to the first end cap (121) along the third direction (Z). The second end cap (122) is provided with an explosion-proof valve (1221). An electrode assembly (130) is disposed within the receiving cavity (111) and connected to the electrode post (1211); An exhaust support (140) is disposed within the receiving cavity (111). The exhaust support (140) is disposed along the third direction (Z) between the electrode assembly (130) and the second end cap (122), and abuts against the electrode assembly (130) and the second end cap (122) respectively. The exhaust support (140) is provided with an exhaust hole (141) that extends along the third direction (Z). The exhaust hole (141) corresponds to the explosion-proof valve (1221). An exhaust groove (142) is provided on the side of the exhaust support (140) near the second end cap (122), and the exhaust groove (142) communicates with the exhaust hole (141).

2. The single-cell battery according to claim 1, characterized in that, The second end cap (122) is provided to protrude in the direction away from the electrode assembly (130) along the third direction (Z) so that a groove (1222) is formed on the side of the second end cap (122) facing the electrode assembly (130), and the groove (1222) communicates with the vent (141).

3. The single-cell battery according to claim 1, characterized in that, The single cell (100) also has a first direction (X) intersecting the third direction (Z), and the venting groove (142) includes a first venting groove (1421) which extends from the edge of the venting support (140) along the first direction (X) and communicates with the venting hole (141).

4. The single-cell battery according to claim 3, characterized in that, The single cell (100) also has a second direction (Y) intersecting the third direction (Z), and the exhaust groove (142) further includes a second exhaust groove (1422) which extends from the edge of the exhaust support (140) along the second direction (Y) and communicates with the exhaust hole (141).

5. The single-cell battery according to claim 4, characterized in that, The second exhaust groove (1422) is provided in multiple sets, and the multiple sets of the second exhaust groove (1422) are arranged opposite to each other along the second direction (Y). Each set of the second exhaust groove (1422) includes multiple second exhaust grooves (1422), and the multiple second exhaust grooves (1422) are arranged at intervals along the first direction (X).

6. The single-cell battery according to claim 4, characterized in that, The exhaust support (140) has an exhaust groove (142) on the side away from the second end cap (122); the first exhaust groove (1421) and the second exhaust groove (1422) are respectively disposed on two opposite sides of the exhaust support (140) along the third direction (Z).

7. The single-cell battery according to claim 4, characterized in that, Along the direction of the exhaust support (140) near the second end cap (122), the width of both the first exhaust groove (1421) and the second exhaust groove (1422) gradually increases.

8. The single-cell battery according to claim 3, characterized in that, Multiple first exhaust slots (1421) are provided, and the multiple first exhaust slots (1421) are respectively arranged opposite to each other along the first direction (X).

9. The single-cell battery according to claim 1, characterized in that, The single cell (100) also includes an insulating layer (150), which is disposed in the receiving cavity (111) and wraps around the electrode assembly (130). The exhaust support (140) is thermally fused to the insulating layer (150).

10. A battery pack, characterized in that, Includes the single cell (100) according to any one of claims 1 to 8.

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