Single battery and battery pack

Abstract

The utility model 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, a first end cover, an electrode assembly and a pole; the shell defines a containing cavity; the first end cover is connected with the shell in the first direction to cover the containing cavity, and the first end cover is provided with an anti-explosion valve. The electrode assembly is accommodated in the accommodating cavity; the pole is arranged at one end, deviating from the first end cover, of the shell along a first direction; the first end cover comprises a protruding part and an end cover body, the end cover body is connected with the shell, the protruding part and the anti-explosion valve are arranged in a spaced mode, the protruding part protrudes in the direction close to the electrode assembly in the first direction and abuts against the electrode assembly, and a first exhaust channel is defined by the end cover body, the protruding part, the shell and the electrode assembly. The first exhaust channel is communicated with the anti-explosion valve and the containing cavity. The single battery provided by the utility model not only can prevent the explosion-proof valve arranged on the first end cover from directly contacting with the electrode assembly, but also can realize quick exhaust and ensure the exhaust efficiency.

Description

TECHNICAL FIELD

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

[0002] In the field of power battery, how to ensure the manufacturability and safety reliability of the battery is the most important for the battery manufacturing enterprise, and the reliability of the valve relief of the battery is particularly crucial. In the thermal-electric classification scheme, the explosion-proof valve and the pole are on the opposite sides of the battery.

[0003] If the thermal-electric separation scheme is adopted, the key to its reliability lies in how to make the gas smoothly discharge to the explosion-proof valve to achieve rapid exhaust. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a single battery and a battery pack.

[0005] In a first aspect, the present application provides a single battery having a first direction, comprising:

[0006] a housing defining a receiving cavity;

[0007] a first end cover connected to the housing along the first direction to seal the receiving cavity, the first end cover being provided with an explosion-proof valve;

[0008] an electrode assembly accommodated in the receiving cavity;

[0009] a pole provided on an end of the housing away from the first end cover along the first direction and connected to the electrode assembly;

[0010] The first end cover comprises a protruding portion and an end cover body, the end cover body is connected to the housing, the protruding portion is provided on a side of the end cover body facing the electrode assembly, the protruding portion is located in the receiving cavity, the protruding portion is spaced apart from the explosion-proof valve, the protruding portion protrudes in a direction close to the electrode assembly along the first direction and abuts against the electrode assembly, the end cover body, the protruding portion, the housing and the electrode assembly form a first exhaust passage, and the first exhaust passage communicates with the explosion-proof valve and the receiving cavity.

[0011] In some embodiments, the single battery further has a second direction intersecting the first direction, and the protruding portion is arranged to extend along the second direction.

[0012] In some embodiments, the single battery further has a third direction intersecting the first direction and the second direction, and the number of the protruding portions is a plurality, and the plurality of protruding portions are arranged to be spaced apart along the third direction.

[0013] In some embodiments, a plurality of the protrusions are arranged along the second direction, and the plurality of the protrusions are arranged on both sides of the explosion-proof valve along the second direction, and a first guide channel is formed between the protrusions adjacent along the third direction, and the first guide channel is in communication with the first exhaust channel.

[0014] In some embodiments, the plurality of the protrusions are arranged along a circumference of the explosion-proof valve.

[0015] In some embodiments, the single battery further has a second direction intersecting the first direction, and along the second direction, the electrode assembly and the inner wall of the shell form a second exhaust channel, and the second exhaust channel is in communication with the first exhaust channel.

[0016] In some embodiments, the single battery further comprises an insulation layer, and the insulation layer is wrapped outside the electrode assembly, and the protrusions abut against the insulation layer along the first direction.

[0017] In some embodiments, the single battery further comprises a second end cover, and along the first direction, the second end cover is connected to the shell to seal the accommodating cavity, and the second end cover is arranged opposite to the first end cover along the first direction, and the pole is arranged on the second end cover and connected to the electrode assembly.

[0018] In some embodiments, the single battery further comprises a support arranged in the accommodating cavity, and the single battery further has a second direction intersecting the first direction, and the support is connected to one end of the electrode assembly along the second direction and arranged between the shell and the electrode assembly.

[0019] In a second aspect, the present application provides a battery pack comprising the single battery.

[0020] Embodiments of the present application have the following advantages: by arranging the protrusions on the side of the end cover body facing the electrode assembly, the end cover body and the electrode assembly are separated by the protrusions, not only preventing the explosion-proof valve arranged on the end cover body from directly contacting the electrode assembly, but also forming a first exhaust channel between the end cover body and the electrode assembly, so that the accommodating cavity and the explosion-proof valve are in communication through the first exhaust channel, and the gas generated inside the electrode assembly can flow into the explosion-proof valve through the first exhaust channel, so as to achieve rapid exhaust and ensure exhaust efficiency.

[0021] In order to make the above objectives, characteristics and advantages of the present application more apparent and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are referred to. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 An exploded view of a single battery according to some embodiments of the present application is shown from one perspective;

[0024] Figure 2 A structural schematic view of a first end cover in a single battery according to some embodiments of the present application is shown from a first perspective;

[0025] Figure 3 A structural schematic view of a first end cover in a single battery according to some embodiments of the present application is shown from a second perspective;

[0026] Figure 4 A structural schematic view of a first end cover in a single battery according to some embodiments of the present application is shown from a third perspective;

[0027] Figure 5 A structural schematic view of a first end cover in a single battery according to some embodiments of the present application is shown from a fourth perspective;

[0028] Figure 6 A cross-sectional view of a single battery according to some embodiments of the present application is shown from one perspective;

[0029] Figure 7 An enlarged view of part A in Figure 6 is shown;

[0030] Figure 8 An exploded view of a single battery according to some embodiments of the present application is shown from one perspective;

[0031] Figure 9 A cross-sectional view of a single battery according to some embodiments of the present application is shown from one perspective;

[0032] Figure 10 An enlarged view of part B in Figure 9 is shown;

[0033] Figure 11 A structural schematic view of a first end cover in a single battery according to some embodiments of the present application is shown from a fourth perspective;

[0034] Main element symbol explanation:

[0035] 10 - monomer cell; 100 - housing; 110 - accommodation cavity; 120 - first end cover; 121 - protrusion; 122 - end cover body; 123 - first wall surface; 124 - second wall surface; 130 - second end cover; 140 - explosion-proof valve; 150 - pole; 200 - electrode assembly; 300 - first exhaust passage; 310 - first guide passage; 400 - second exhaust passage.

[0036] X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters throughout the figures denote the same elements or elements having the same function. The embodiments described below are merely exemplary for the purpose of explaining present application and can not be understood as a limitation of present application.

[0038] It needs to be noted that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. Like reference numerals in the figures denote like elements throughout the specification. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms since such terms are only used to distinguish one element, component, region, layer and / or section from another element, component, region, layer and / or section.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it 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.

[0040] In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0041] 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.

[0042] like Figure 1 , Figure 2 and Figure 7 As shown, some embodiments of this application provide a single-cell battery that, while ensuring the cell capacity of the single-cell battery 10, improves the smoothness of venting and prevents blockage. The single-cell battery 10 has a first direction X.

[0043] The single cell 10 includes a housing 100, a first end cap 120, an electrode assembly 200, and a terminal post 150.

[0044] The housing 100 defines an outlet receiving cavity 110 with an opening, through which the electrode assembly 200 can be installed into the receiving cavity 110.

[0045] The first end cap 120 is connected to the housing 100 along the first direction X, and seals the receiving cavity 110 with the first end cap 120, so as to form a sealed receiving cavity 110 by the inner wall of the housing 100 and the side of the first end cap 120 facing the receiving cavity 110. It can be understood that the first end cap 120 is provided at the opening and seals the opening. The connection method between the first end cap 120 and the housing 100 includes at least one of the following: snap connection, adhesive, threaded connection, bolt connection, hinge, or integral molding.

[0046] The first end cap 120 is equipped with an explosion-proof valve 140. By installing the explosion-proof valve 140 on the first end cap 120, the internal pressure of the individual battery 10 can be controlled, thereby preventing the individual battery 10 from exploding. When excessive pressure is generated inside the individual battery 10, the explosion-proof valve 140 will open under the pressure, thereby releasing the high-pressure gas generated inside the individual battery 10 into the external environment, thereby reducing the internal pressure of the individual battery 10 and effectively preventing the risk of the individual battery 10 exploding.

[0047] The electrode assembly 200 is housed in the receiving cavity 110. It is understood that the electrode assembly 200 is installed into the receiving cavity 110 through an opening and sealed at the opening by the first end cap 120, thereby housing the electrode assembly 200 in the sealed receiving cavity 110. The housing 100 and the first end cap 120 provide protection and fixation for the electrode assembly 200, ensuring the safety and stability of the electrode assembly 200 in the receiving cavity 110.

[0048] The pole 150 is arranged at one end of the shell 100 away from the first end cover 120 along the first direction X and is connected with the electrode assembly 200. A structure for forming thermal-electric separation on the single battery 10 is formed, that is, the explosion-proof valve 140 and the pole 150 are not designed on the same side.

[0049] In the embodiment, the first end cover 120 includes an end cover body 122 and a protruding part 121, the end cover body 122 is connected with the shell 100, and the connection manner includes at least any one of bonding, clamping or one-piece forming, which can be specifically set according to actual conditions.

[0050] The protruding part 121 is arranged on the side of the end cover body 122 facing the electrode assembly 200. It should be noted that the number of the protruding part 121 can be any number of two or more, which can be specifically set according to actual conditions.

[0051] In addition, the protruding part 121 is located in the accommodating cavity 110, the protruding part 121 protrudes in the direction of approaching the electrode assembly 200 along the first direction X, and the protruding part 121 abuts against the electrode assembly 200, so as to provide a supporting action between the end cover body 122 and the electrode assembly 200 through the protruding part 121, only to ensure the stability between the end cover body 122 and the electrode assembly 200, and at the same time, the end cover body 122 and the electrode assembly 200 are spaced to form a flow guiding space through the protruding part 121.

[0052] It should be noted that the protruding part 121 is spaced apart from the explosion-proof valve 140 to prevent the protruding part 121 from affecting the opening of the explosion-proof valve 140, so as to provide a supporting action between the end cover body 122 and the electrode assembly 200 through the supporting part while avoiding the direct contact between the explosion-proof valve 140 and the electrode assembly 200, thereby ensuring the stability of the explosion-proof valve 140.

[0053] In the embodiment, the side of the end cover body 122 facing the electrode assembly 200, the surface of the protruding part 121, the inner wall of the shell 100 and the side of the electrode assembly 200 facing the end cover body 122 enclose to form a first exhaust passage 300, the first exhaust passage 300 is communicated with the explosion-proof valve 140 and the accommodating cavity 110, so as to guide the gas generated by the electrode assembly 200 in the accommodating cavity 110 to the explosion-proof valve 140 through the first exhaust passage 300.

[0054] By arranging the protruding portion 121 on the side of the end cover body 122 facing the electrode assembly 200, the end cover body 122 and the electrode assembly 200 are separated by the protruding portion 121, which not only prevents the explosion-proof valve 140 arranged on the end cover body 122 from directly contacting the electrode assembly 200, but also forms the first exhaust passage 300 between the end cover body 122 and the electrode assembly 200, so that the accommodation cavity 110 is communicated with the explosion-proof valve 140 through the first exhaust passage 300, and the gas generated inside the electrode assembly 200 can flow into the explosion-proof valve 140 through the first exhaust passage 300, so as to achieve rapid exhaust and ensure exhaust efficiency. In addition, the protruding portion 121 can improve the strength of the first end cover 120 or the shell 100, which on the one hand reduces the influence of the deformation of the shell 100 caused by the increase of internal pressure on the opening valve value of the explosion-proof valve 140, and on the other hand weakens the fatigue effect of the explosion-proof valve 140 generated during the operation of the electrode assembly 200 in the service life, so as to make the uniformity of the stress of the electrode assembly 200.

[0055] It can be understood that the electrode assembly 200 is separated from the end cover body 122 by the protruding portion 121, so that the electrode assembly 200 does not directly contact the end cover body 122 or the explosion-proof valve 140, thereby avoiding the electrode assembly 200 being sucked to the position corresponding to the explosion-proof valve 140 due to the internal and external pressure difference after the explosion-proof valve 140 is opened, and blocking the explosion-proof valve 140.

[0056] As shown in Figures 1 to 4 In some embodiments, the single battery 10 also has a second direction Y intersecting the first direction X, and the protruding portion 121 is arranged to extend along the second direction Y.

[0057] It can be understood that the length direction of the protruding portion 121 is parallel to the second direction Y, and by increasing the length of the protruding portion 121, not only the compression strength of the protruding portion 121 can be improved, but also the contact area between the side of the protruding portion 121 facing the electrode assembly 200 and the electrode assembly 200 can be increased. It should be noted that under the same pressure, the larger the contact area, the smaller the deformation of the electrode assembly 200 or the protruding portion 121, and the better the stability.

[0058] In the present embodiment, by increasing the length of the protruding portion 121, the compression strength of the protruding portion 121 is improved, and the deformation of the protruding portion 121 and the electrode assembly 200 under pressure is reduced, so as to ensure the uniformity of the stress of the protruding portion 121 and the electrode assembly 200, thereby ensuring the stability of the protruding portion 121 and the electrode assembly 200.

[0059] It is worth noting that the projected area of the protrusion 121 on the end cover body 122 in the first direction X is smaller than the area of the side of the end cover body 122 away from the electrode assembly 200, so that the gas generated by the electrode assembly 200 in the accommodation cavity 110 can be guided to the explosion-proof valve 140 through the peripheral surface of the protrusion 121, so that the gas in the accommodation cavity 110 can be guided to the explosion-proof valve 140 through the first exhaust passage 300 from multiple directions, thereby improving the gas guiding efficiency of the first exhaust passage 300 and improving the exhaust efficiency.

[0060] As shown in the example, Figure 11 In some embodiments, the number of protrusions 121 is two, and the two protrusions 121 are arranged at both ends of the explosion-proof valve 140 in the second direction Y, and the first gas flow passage is enclosed by the peripheral side of the explosion-proof valve 140, the side of the end cover body 122 facing the electrode assembly 200, the inner wall of the shell 100 and the side of the electrode assembly 200 facing the end cover body 122. That is, in this embodiment, the gas generated by the electrode assembly 200 in the accommodation cavity 110 can be guided to the explosion-proof valve 140 along the peripheral side of the protrusion 121.

[0061] By arranging the protrusions 121 at both ends of the explosion-proof valve 140 in the second direction Y, the area of the side of the protrusion 121 facing the electrode assembly 200 is further increased while ensuring the exhaust efficiency of the first exhaust passage 300, thereby improving the overall strength of the protrusion 121 and the uniformity of the force received by the protrusion 121 and the electrode assembly 200, ensuring the stability of the electrode assembly 200 and the protrusion 121.

[0062] As shown in the example, Figures 2 to 5 In some embodiments, the monomer battery 10 also has a third direction Z intersecting the first direction X and the second direction Y, and the number of protrusions 121 is multiple, and the multiple protrusions 121 are arranged in the third direction Z.

[0063] It can be understood that in the third direction Z, the first guide passage 310 is formed between two adjacent protrusions 121, so that the gas generated by the electrode assembly 200 in the accommodation cavity 110 can be guided to the explosion-proof valve 140 through the first guide passage 310.

[0064] In this embodiment, the multiple protrusions 121 are arranged at equal intervals in the third direction Z, and the number of protrusions 121 is increased to increase the number of first guide passages 310, which can not only improve the exhaust efficiency. It should be noted that since the protrusion 121 needs to support the electrode assembly 200, the uniform distribution of the multiple protrusions 121 ensures that the electrode assembly 200 is uniformly stressed and does not produce local depressions.

[0065] It should be noted that the first guide channel 310 in the embodiment is part of the first exhaust channel 300.

[0066] As shown in the drawings, Figures 2 to 5 In some embodiments, a plurality of protrusions 121 are provided along the second direction Y, the plurality of protrusions 121 are located on both sides of the explosion-proof valve 140 along the second direction Y, and the first guide channel is formed between the protrusions 121 adjacent along the third direction Z, and the first guide channel is in communication with the first exhaust channel 300. The second guide channel is formed between two protrusions 121 adjacent along the second direction Y, and the second guide channel is in communication with the first guide channel 310, so that the gas generated by the electrode assembly 200 in the accommodation cavity 110 can be guided to the explosion-proof valve 140 through the second guide channel and the first guide channel 310.

[0067] It should be noted that the first guide channel 310 and the second guide channel are both part of the first exhaust channel 300, and the second guide channel is provided to increase the guide direction and guide space of the first exhaust channel 300, thereby further improving the efficiency of the first exhaust channel 300 in guiding the gas in the accommodation cavity 110 to the explosion-proof valve 140, i.e., improving the exhaust efficiency.

[0068] In some embodiments, the number of protrusions 121 is a plurality, the plurality of protrusions 121 are arranged around the circumference of the explosion-proof valve 140, and two adjacent protrusions 121 are spaced apart to define a guide channel, which communicates the accommodation cavity 110 with the explosion-proof valve 140, so that the gas generated by the electrode assembly 200 in the accommodation cavity 110 can be guided to the explosion-proof valve 140 through the guide channel, thereby providing a guide effect on the gas in the accommodation cavity 110 through the guide channel, thereby improving the exhaust efficiency.

[0069] As shown in the drawings, Figure 6 and Figure 7 In some embodiments, the single battery 10 also has a second direction Y intersecting the first direction X, along the second direction Y, the electrode assembly 200 and the inner wall of the shell 100 form a second exhaust channel 400, the second exhaust channel 400 is in communication with the first exhaust channel 300, so that the gas in the second exhaust channel 400 is guided to the explosion-proof valve 140 through the first exhaust channel 300. It can be understood that by providing the explosion-proof valve 140 on the first end cover 120, the pressure inside the single battery 10 is controlled through the explosion-proof valve 140, thereby preventing the single battery 10 from exploding. When the internal pressure of the single battery 10 is too high, the explosion-proof valve 140 will open under the action of the pressure, thereby releasing the high-pressure gas generated in the single battery 10 to the external environment, thereby reducing the pressure inside the single battery 10, thereby effectively preventing the risk of explosion of the single battery 10.

[0070] As shown in the drawings, Figure 1and Figure 5 As shown, in some embodiments, the single cell also includes an insulating layer that wraps around the electrode assembly 200, and the protrusion 121 abuts against the insulating layer along the first direction X.

[0071] The end cap body 122 has a first wall surface 123 and a second wall surface 124 disposed opposite to each other along a first direction X.

[0072] The first wall surface 123 is recessed along the first direction X towards the side close to the electrode assembly 200, and the second wall surface 124 protrudes along the first direction X towards the side close to the electrode assembly 200 to form a protrusion 121. This not only improves the simplicity and efficiency of forming the protrusion 121, but also ensures the overall strength of the protrusion 121, so as to ensure the stability of the protrusion 121 in supporting the end cap body 122 and the electrode assembly 200.

[0073] It should be noted that if the area of ​​the protrusion 121 facing the electrode assembly 200 is too large, although it can improve the uniformity and stability of the force on the electrode assembly 200, the cross-sectional area of ​​the first exhaust channel 300 will be reduced, and the exhaust rate will be reduced. If the area of ​​the protrusion 121 facing the electrode assembly 200 is too small, the supporting force of the protrusion 121 on the electrode assembly 200 will be concentrated, which may easily cause local dents or bends in the electrode assembly 200.

[0074] Based on this, in some embodiments of this application, the area of ​​the second wall 124 is S1, and the sum of the areas of the plurality of protrusions 121 facing the electrode assembly 200 is S2, wherein S1 and S2 satisfy the relationship 0.15*S1≤S2≤0.6*S1.

[0075] By controlling the ratio between the sum of the areas of the protrusions 121 facing the electrode assembly 200 and the area of ​​the second wall surface 124 to between 0.15 and 0.6, not only can the uniformity and stability of the force on the electrode assembly 200 be effectively guaranteed, but the exhaust efficiency of the first exhaust channel 300 can also be improved, the blockage of the first exhaust channel 300 can be prevented, and the stability of the exhaust can be guaranteed.

[0076] like Figures 8 to 10 As shown, in some embodiments, the single cell 10 further includes a second end cap 130. The second end cap 130 is connected to the housing 100 along the first direction X to seal the receiving cavity 110. The second end cap 130 and the first end cap 120 are disposed opposite to each other along the first direction X, so as to seal both ends of the receiving cavity 110 along the first direction X by the first end cap 120 and the second end cap 130. The first end cap 120, the second end cap 130 and the housing 100 are connected to form a sealed receiving cavity 110 to ensure the stability of the electrode assembly 200 in the receiving cavity 110.

[0077] The pole 150 is arranged on the side of the second end cover 130 away from the first end cover 120, and the pole 150 is connected with the electrode assembly 200, so as to connect the electrode assembly 200 with an external carrier through the pole 150.

[0078] In some embodiments, the single battery 10 further comprises a support arranged in the accommodating cavity 110, and the single battery 10 further has a second direction Y intersecting the first direction X, the support is connected with one end of the electrode assembly 200 along the second direction Y and is arranged between the shell 100 and the electrode assembly 200.

[0079] Specifically, the support is arranged between the bottom wall of the shell 100 and the electrode assembly 200, the bottom wall is the side on which the single battery 10 is placed, and the area of the support is smaller than the area of the end of the electrode assembly 200 facing the bottom wall. In this way, the gas can be discharged through the space between the support and the side wall of the shell.

[0080] It should be noted that the electrode assembly 200 is provided with an insulating layer, and the support can be connected with the insulating layer by a hot melting manner. In order to facilitate the discharge of the gas, a weak part can also be arranged on the insulating layer according to the requirement, so as to facilitate the discharge of the gas from the insulating layer.

[0081] The connection mode between the second end cover 130 and the shell 100 at least includes one of clamping, bonding, bolt connection or integral connection.

[0082] In a second aspect, the application provides a battery pack comprising the single battery 10 in any of the above embodiments.

[0083] It can be understood that the battery pack has the beneficial effects of the single battery 10 in any of the above embodiments, which will not be described here.

[0084] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as a limitation, and thus, other examples of the example embodiments can have different values.

[0085] It should be noted that similar reference numerals and letters refer to similar items throughout the accompanying drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0086] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application.

Claims

1. A single cell having a first direction (X), characterized in that, The single battery (10) comprises: a shell (100) defining a containing cavity (110); a first end cover (120) connected to the shell (100) in the first direction (X) to cover the containing cavity (110), the first end cover (120) being provided with an explosion-proof valve (140); an electrode assembly (200) accommodated in the containing cavity (110); a pole column (150) provided at one end of the shell (100) away from the first end cover (120) in the first direction (X) and connected to the electrode assembly (200); the first end cover (120) comprises a protruding portion (121) and an end cover body (122), the end cover body (122) is connected to the shell (100), the protruding portion (121) is provided on the side of the end cover body (122) facing the electrode assembly (200), the protruding portion (121) is located in the containing cavity (110), the protruding portion (121) is spaced apart from the explosion-proof valve (140), the protruding portion (121) protrudes in the direction close to the electrode assembly (200) in the first direction (X) and abuts against the electrode assembly (200), the end cover body (122), the protruding portion (121), the shell (100) and the electrode assembly (200) form a first exhaust passage (300), and the first exhaust passage (300) communicates with the explosion-proof valve (140) and the containing cavity (110).

2. The cell according to claim 1, wherein The single battery (10) further has a second direction (Y) intersecting the first direction (X), and the protruding portion (121) is arranged to extend in the second direction (Y).

3. The cell according to claim 2, wherein The single battery (10) further has a third direction (Z) intersecting the first direction (X) and the second direction (Y), and the number of the protruding portion (121) is multiple, and multiple protruding portions (121) are arranged to be spaced apart in the third direction (Z).

4. The cell according to claim 3, wherein A plurality of protruding portions (121) are arranged in the second direction (Y), and multiple protruding portions (121) are arranged on both sides of the explosion-proof valve (140) in the second direction (Y), and a first guide passage is formed between adjacent protruding portions (121) in the third direction (Z), and the first guide passage communicates with the first exhaust passage (300).

5. The cell according to claim 1, wherein The number of the protruding portion (121) is multiple, and multiple protruding portions (121) are arranged circumferentially around the explosion-proof valve (140).

6. The single cell according to any one of claims 1 to 5, characterized by, The single battery (10) further has a second direction (Y) intersecting the first direction (X), and the electrode assembly (200) and the inner wall of the shell (100) form a second exhaust passage (400) in the second direction (Y), and the second exhaust passage (400) communicates with the first exhaust passage (300).

7. The cell according to claim 1, wherein The single battery further comprises an insulating layer wrapped outside the electrode assembly (200), and the protruding portion (121) abuts against the insulating layer in the first direction (X).

8. The cell according to any one of claims 1 to 5, wherein, The single battery (10) further comprises a second end cover (130) connected with the shell (100) to cover the accommodating cavity (110) along the first direction (X), and the second end cover (130) is oppositely arranged with the first end cover (120) along the first direction (X), the pole (150) is arranged on the second end cover (130) and connected with the electrode assembly (200).

9. The cell according to claim 8, wherein The single battery (10) further comprises a support arranged in the accommodating cavity (110), and the single battery (10) further has a second direction (Y) intersecting with the first direction (X), and the support is connected with one end of the electrode assembly (200) along the second direction (Y) and arranged between the shell (100) and the electrode assembly (200).

10. A battery pack, characterized by, The single battery (10) comprises: The single battery (10) according to any one of claims 1 to 9.

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