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 a second direction which are intersected, and the single battery comprises a shell, an electrode assembly, a first end cover and a pole; a containing cavity is defined by the shell, and the shell is provided with a first side wall and a second side wall which are oppositely arranged in the second direction; the electrode assembly is accommodated in the accommodating cavity; the first end cover is connected with the shell in the first direction, covers and seals the containing cavity and is provided with an anti-explosion valve. The pole penetrates through the shell, is arranged opposite to the first end cover in the first direction and is connected with the electrode assembly; a first protruding part is formed on the first side wall, a first exhaust space is formed on the side, facing the electrode assembly, of the first side wall, and the first exhaust space is communicated with the containing cavity. According to the single battery provided by the invention, the stress borne by the shell in the second direction is dispersed through the first lug boss, so that the physical strength of the shell is enhanced, and the structural strength and the safety of the shell are improved.

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 battery strength is a top priority for battery manufacturers. In particular, shortening individual battery cells is crucial for achieving higher energy density, better volume utilization, and separation of heat and electricity.

[0003] Because the length of the short-blade battery is 2 to 3 times longer than that of a conventional battery cell, the increased length of the casing makes the aluminum casing prone to deformation on the sides when subjected to external forces or high internal pressure. Therefore, improving the strength of the sides has become a key focus. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.

[0005] In a first aspect, this application provides a single-cell battery having intersecting first and second directions, including:

[0006] The housing defines a storage cavity, and along the second direction, the housing includes a first sidewall and a second sidewall disposed opposite to each other;

[0007] The electrode assembly is housed in the receiving cavity;

[0008] A first end cap is connected to the housing along the first direction, the first end cap seals the receiving cavity, and the first end cap is provided with an explosion-proof valve;

[0009] An electrode post is inserted through the housing and is disposed opposite to the first end cap along the first direction; the electrode post is connected to the electrode assembly.

[0010] The first sidewall protrudes in the direction away from the electrode assembly along the second direction to form a first protrusion, and a first exhaust space is formed on the side of the first sidewall facing the electrode assembly. The first exhaust space is in communication with the receiving cavity.

[0011] In some embodiments, the second sidewall protrudes in the direction away from the electrode assembly along the second direction to form a second protrusion, and a second exhaust space is formed on the side of the second sidewall facing the electrode assembly, the second exhaust space being in communication with the receiving cavity.

[0012] In some embodiments, the single cell further has a third direction that intersects the first direction and the second direction in pairs. Along the first direction, the length of the first protrusion is less than the length of the first sidewall, and along the third direction, the width of the first protrusion is less than the width of the first sidewall.

[0013] In some embodiments, the receiving cavity has a gap along the second direction, the gap is located between the electrode assembly and the first sidewall, the gap extends along the first direction, the gap communicates with one end of the receiving cavity near the pole post and with one end of the receiving cavity near the explosion-proof valve, and the first exhaust space communicates with the gap.

[0014] In some embodiments, the first end cap protrudes in a direction away from the electrode assembly along the first direction to form a third protrusion, and a cavity is formed on the side of the first end cap facing the electrode assembly. The explosion-proof valve is disposed on the third protrusion, and the first exhaust space communicates with the cavity through the gap.

[0015] In some embodiments, the first sidewall is provided with a plurality of first exhaust grooves on the side facing the second sidewall. The first exhaust grooves are recessed in the direction away from the electrode assembly along the second direction. The plurality of first exhaust grooves are connected to both ends of the first exhaust space along the first direction. The first exhaust grooves are connected to the gap.

[0016] In some embodiments, the single cell also has a third direction that intersects the first direction and the second direction in pairs;

[0017] There are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the first direction. The length of the multiple first protrusions along the first direction is less than the length of the first sidewall.

[0018] And / or, there are multiple second protrusions, the multiple second protrusions are spaced apart along the first direction, and the length of the multiple second protrusions along the first direction is less than the length of the second sidewall.

[0019] In some embodiments, the single cell further has a third direction intersecting the first direction and the second direction;

[0020] There are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the third direction. The width of the multiple first protrusions along the third direction is smaller than the width of the first sidewall.

[0021] And / or, there are multiple second protrusions, which are spaced apart along the third direction, and the width of the multiple second protrusions along the third direction is less than the width of the second sidewall.

[0022] In some embodiments, the side of the first protrusion facing away from the second sidewall is a plane, and the side of the second protrusion facing away from the first sidewall is a plane.

[0023] Secondly, this application provides a battery pack, including: a housing and the single battery cell, wherein the single battery cell is installed in the housing.

[0024] The embodiments of this application have the following advantages: by providing a first protrusion on the first sidewall, the surface area of ​​the first sidewall is increased, so as to disperse the stress borne by the shell along the second direction and provide a buffering effect, preventing the shell from deforming or breaking when subjected to external force, thereby enhancing the physical strength of the shell along the second direction, and also providing additional support or protection, thereby improving the structural strength and safety of the shell.

[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 in some embodiments of this application is shown.

[0028] Figure 2 A first-view cross-sectional view of a single-cell battery provided by some embodiments of this application is shown;

[0029] Figure 3 It shows Figure 2 Enlarged view of section A in the middle;

[0030] Figure 4 This illustration shows a schematic diagram of the structure of a first end cap in a single-cell battery according to some embodiments of this application;

[0031] Figure 5 It shows Figure 4 Sectional view of the middle BB section;

[0032] Figure 6 This application provides a schematic diagram of the structure of a casing in a single-cell battery from one perspective, based on some embodiments of the present application.

[0033] Figure 7 It shows Figure 6 A sectional view of the central CC section;

[0034] Figure 8 It shows Figure 6 Cross-sectional view of the middle DD section.

[0035] Explanation of key component symbols:

[0036] 10-Single battery; 100-Housing shell; 110-Storage cavity; 120-First sidewall; 121-First protrusion; 122-First venting space; 123-First venting groove; 124-Gap; 130-Second sidewall; 131-Second protrusion; 132-Second venting space; 133-Second venting groove; 200-First end cap; 210-Explosion-proof valve; 220-Third protrusion; 300-Electrode assembly; 400-Second end cap; 410-Electrode post; 500-Cavity.

[0037] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] like Figures 1 to 5 As shown, some embodiments of this application provide a single-cell battery 10, mainly used to improve the overall strength of the single-cell battery 10 and ensure its stability. The single-cell battery 10 has intersecting first direction X and second direction Y.

[0044] The single cell 10 includes a housing 100, an electrode assembly 300, a first end cap 200, and a terminal post 410.

[0045] The housing 100 defines a storage cavity 110. Along the second direction Y, the housing 100 includes a first sidewall 120 and a second sidewall 130 disposed opposite to each other. The first sidewall 120 and the second sidewall 130 are parallel to each other.

[0046] The electrode assembly 300 is housed in the storage cavity 110, and the housing 100 provides protection and limit the electrode assembly 300 to ensure the stability of the electrode assembly 300 in the housing 100.

[0047] The first end cap 200 is connected to the housing 100 along the first direction X. The first end cap 200 covers the storage cavity 110 to form a sealed storage cavity 110. The first end cap 200 limits the electrode assembly 300 in the first direction X to ensure the stability of the electrode assembly 300 in the storage cavity 110.

[0048] The connection method between the first end cap 200 and the housing 100 includes any one of snap-fit, adhesive, hot-melt connection or integral molding, which can be specifically set according to the actual situation.

[0049] In addition, the first end cap 200 is provided with an explosion-proof valve 210, so that when the pressure in the housing cavity 110 of the single battery 10 is greater than the preset pressure, the explosion-proof valve 210 opens under the pressure and allows the excess gas in the housing cavity 110 to be discharged from the housing cavity 110, preventing the single battery 10 from exploding and ensuring the stability and safety of the single battery 10.

[0050] Batteries are prone to thermal runaway and eruption under conditions such as high temperature, overcharging, over-discharging, and mechanical damage, which pose a threat to battery safety.

[0051] Based on this, in this embodiment, the electrode post 410 is inserted into the housing 100, and the electrode post 410 is arranged opposite to the first end cap 200 along the first direction X. The electrode post 410 is electrically connected to the electrode assembly 300. That is, by setting the explosion-proof valve 210 and the electrode post 410 at both ends of the electrode assembly 300 along the first direction X, a thermoelectric separation structure is formed. By separating the arrangement of the electrode post 410 and the explosion-proof valve 210, the thermal runaway of the electrode assembly 300 will not lead to "electric diffusion" phenomena such as arcing, short circuits, and insulation failure. This avoids fires and explosions of the single cell 10 under abnormal conditions, thereby improving the safety of the single cell 10, reducing the occurrence of runaway events of the single cell 10, and avoiding personal and property losses.

[0052] In this embodiment, the first sidewall 120 protrudes in the direction opposite to the electrode assembly 300 along the second direction Y to form a first protrusion 121. Since the formation of the first protrusion 121 increases the surface area, the first protrusion 121 can disperse the stress on the first sidewall 120 and form a buffer structure on the first sidewall 120. The first protrusion 121 can provide buffering and protection for the housing 100 and improve the strength of the housing 100.

[0053] Additionally, the first protrusion 121 forms a first exhaust space 122 on the side of the first sidewall 120 facing the electrode assembly 300, and the first exhaust space 122 communicates with the receiving cavity 110. Gas generated by the electrode assembly can enter the first exhaust space 122.

[0054] like Figure 6 and Figure 8 As shown, in some embodiments, the second protrusion 131 protrudes in a direction away from the electrode assembly 300 along a second direction to form the second protrusion 131. The protruding second protrusion 131 can disperse the stress borne on the second sidewall 130 and form a buffer structure on the second sidewall 130. The second protrusion 131 can provide buffering and protection for the housing 100 and improve the strength of the housing 100.

[0055] Secondly, the second protrusion 131 forms a second exhaust space 132 on the side of the second sidewall 130 facing the electrode assembly 300, and the second exhaust space 132 is connected to the receiving cavity 110.

[0056] By providing the first protrusion 121 and the second protrusion 131, it is possible to prevent the first sidewall 120 and the second sidewall 130 from deforming or breaking when subjected to external force, and to provide additional support or protection under certain circumstances, thereby improving the structural strength and safety of the housing 100.

[0057] In some embodiments, the single cell 10 further has a third direction Z that intersects the first direction X and the second direction Y in pairs. In this embodiment, the first protrusion 121 extends along the first direction X, and the length of the first protrusion 121 along the first direction X is less than the length of the first sidewall 120. Along the third direction Z, the width of the first protrusion 121 is less than the width of the first sidewall 120, so that the side of the first protrusion 121 opposite to the second sidewall 130 is misaligned with the edge of the first sidewall 120. This allows the first protrusion 121, which protrudes from the side of the first sidewall 120 opposite to the second sidewall 130, to provide cushioning and protection when the first sidewall 120 is subjected to external forces, thereby improving the strength of the first sidewall 120.

[0058] like Figure 2 and Figure 3 As shown, in some embodiments, a gap 124 is provided within the receiving cavity 110 along the second direction Y. The gap 124 is located between the electrode assembly 300 and the first sidewall 120, and extends along the first direction X. The gap 124 communicates with one end of the receiving cavity 110 near the electrode post 410 and with the other end of the receiving cavity 110 near the explosion-proof valve 210. The first exhaust space 122 communicates with the gap 124. Since the first exhaust space 122 communicates with the electrode post 410 and the explosion-proof valve 210 through the gap 124, the gas generated by the electrode assembly 300 can be smoothly discharged from the explosion-proof valve 210, thereby ensuring the smoothness of gas exhaust.

[0059] Similarly, during thermal runaway, there is also a gap 124 between the second sidewall 130 and the electrode assembly 300. The second exhaust space 132 can guide the gas generated by the electrode assembly 300 in the housing cavity 110 to the explosion-proof valve 210, and then discharge it to the outside of the battery cell through the explosion-proof valve 210, thereby reducing thermal runaway and thus reducing the risk of overall thermal runaway of the single battery cell 10, thereby improving the safety and stability of the single battery cell 10 during use.

[0060] Along the first direction X, the first exhaust space 122 connects the explosion-proof valve 210 and the electrode post 410. That is, the gas generated by the electrode assembly 300 in the housing cavity 110 can be guided to the explosion-proof valve 210 through the first exhaust space 122, and then discharged to the outside of the battery cell through the explosion-proof valve 210, thereby reducing thermal runaway and thus reducing the risk of overall thermal runaway of the single battery cell 10, thereby improving the safety and stability of the single battery cell 10 during use.

[0061] In addition, the second sidewall 130 is provided with a plurality of second exhaust grooves 133 on the side facing the first sidewall 120. The second exhaust grooves 133 extend along the first direction X and connect the second exhaust space 132 and the cavity 500, so that the gas generated by the electrode assembly 300 in the housing cavity 110 can be guided to the cavity 500 through the second exhaust space 132 and the second exhaust grooves 133. When the gas pressure in the housing cavity 110 is greater than the preset pressure that the explosion-proof valve 210 can withstand, the explosion-proof valve 210 opens to allow the gas in the housing cavity 110 to be discharged from the explosion-proof valve 210, thereby reducing the gas pressure in the housing cavity 110 and ensuring the stability and safety of the single battery 10 during use.

[0062] like Figure 4 and Figure 3 As shown, in some embodiments, the first end cap 200 protrudes in the direction away from the electrode assembly 300 along the first direction X to form a third protrusion 220. The third protrusion 220 protrudes in the direction away from the electrode assembly 300, and a cavity 500 is formed on the side of the first end cap 200 facing the electrode assembly 300. The explosion-proof valve 210 is disposed on the third protrusion 220. The cavity 500 is connected to the first exhaust space 122 and the second exhaust space 132, that is, the first exhaust space 122 and the second exhaust space 132 are connected to the cavity 500 through the gap 124 respectively.

[0063] It should be noted that by separating the explosion-proof valve 210 and the electrode assembly 300 through the recess 500, and by providing a guiding effect on the gas generated inside the electrode assembly 300 through the recess 500, the gas can enter the recess 500 through the gas in the first exhaust space 122 and the second exhaust space 132, and impact the explosion-proof valve 210 provided on the first end cover 200 through the recess 500, thereby causing the explosion-proof valve 210 to open under the action of a preset pressure, thereby releasing the gas in the receiving cavity 110, reducing the pressure inside the single cell 10, and thus preventing the single cell 10 from exploding.

[0064] like Figure 8 and Figure 7 As shown, in some embodiments, the first sidewall 120 is provided with a plurality of first exhaust grooves 123 on the side facing the second sidewall 130. The first exhaust grooves 123 are recessed in the direction away from the electrode assembly 300 along the second direction Y. The plurality of first exhaust grooves 123 are arranged along the third direction Z, and the first exhaust grooves 123 extend along the first direction X.

[0065] Multiple first exhaust grooves 123 are connected to the two ends of the first exhaust space 122 along the first direction X. The first exhaust grooves 123 are connected to the gap 124, thereby connecting the first exhaust space 122 and the cavity 500 through the first exhaust grooves 123. This allows the gas generated by the electrode assembly 300 in the housing cavity 110 to be guided to the cavity 500 through the first exhaust space 122 and the first exhaust grooves 123. When the gas pressure in the housing cavity 110 is greater than the preset pressure that the explosion-proof valve 210 can withstand, the explosion-proof valve 210 opens to allow the gas in the housing cavity 110 to be discharged from the explosion-proof valve 210, thereby reducing the gas pressure in the housing cavity 110 and ensuring the stability and safety of the single battery 10 during use.

[0066] In this embodiment, the second protrusion 131 extends along a first direction X, and the length of the second protrusion 131 along the first direction X is less than the length of the second sidewall 130. In addition, the second protrusion 131 extends along a third direction Z, and the width of the second protrusion 131 along the third direction Z is less than the width of the second sidewall 130.

[0067] In some embodiments, there are multiple first protrusions 121. The number of first protrusions 121 can be any number of two or more, and can be specifically set according to the actual situation.

[0068] In this embodiment, a plurality of first protrusions 121 are arranged at intervals along the first direction X, and the distance between two adjacent first protrusions 121 can be specifically set according to the actual situation; in this embodiment, the first protrusions 121 extend along the first direction X, and the length of the plurality of first protrusions 121 along the first direction X is less than the length of the first sidewall 120.

[0069] In other embodiments, there are multiple second protrusions 131, which are spaced apart along a first direction X, and the length of the multiple second protrusions 131 along the first direction X is less than the length of the second sidewall 130. The spacing between two adjacent second protrusions 131 can be specifically set according to the actual situation.

[0070] In other embodiments, there are multiple first protrusions 121, which are spaced apart along the third direction Z, and the width of the multiple first protrusions 121 along the third direction Z is smaller than the width of the first sidewall 120.

[0071] In other embodiments, there are multiple second protrusions 131, which are spaced apart along a third direction Z. The width of the multiple second protrusions 131 along the third direction Z is smaller than the width of the second sidewall 130. The number of second protrusions 131 can be any number of two or more, and can be specifically set according to the actual situation.

[0072] like Figure 6 As shown, in some embodiments, a second exhaust space 132 is formed in the second protrusion 131. Along the first direction X, the second exhaust space 132 connects the explosion-proof valve 210 and the electrode post 410. That is, the gas generated by the electrode assembly 300 in the receiving cavity 110 can be guided to the explosion-proof valve 210 through the second exhaust space 132, and then discharged to the outside of the battery cell through the explosion-proof valve 210, thereby reducing thermal runaway and reducing the risk of overall thermal runaway of the single battery cell 10, thereby improving the safety and stability of the single battery cell 10 during use.

[0073] In addition, such as Figure 8 As shown, along the first direction X, the length of the second protrusion 131 is less than the length of the second sidewall 130, and along the third direction Z, the width of the second protrusion 131 is less than the width of the second sidewall 130, so that the side of the second protrusion 131 facing away from the first sidewall 120 is misaligned with the edge of the second sidewall 130, so that the second protrusion 131 protruding from the side of the second sidewall 130 facing away from the first sidewall 120 can provide a buffering and protection function when the second sidewall 130 is subjected to external force, thereby improving the strength of the second sidewall 130.

[0074] It is understandable that by providing a first protrusion 121 on the first sidewall 120 and a second protrusion 131 on the second sidewall 130, the strength of the first sidewall 120 and the second sidewall 130 is improved, thereby enhancing the overall strength and stability of the housing 100.

[0075] like Figure 8 and Figure 7As shown, in some embodiments, the side of the first protrusion 121 facing away from the second sidewall 130 is a plane, and the side of the second protrusion 131 facing away from the first sidewall 120 is also a plane, in order to improve space utilization and facilitate the vertical placement of the individual battery 10, ensuring stability when placed vertically. At the same time, it can improve the compactness of multiple individual battery 10 combinations, improve space utilization, and thus increase energy density.

[0076] like Figure 1 and Figure 2 As shown, in some embodiments, the single battery cell 10 further includes a second end cap 400. The second end cap 400 is connected to the housing 100 along the first direction X to seal the storage cavity 110. The second end cap 400 and the first end cap 200 are disposed opposite to each other along the first direction X, so as to seal both ends of the storage cavity 110 along the first direction X by the first end cap 200 and the second end cap 400. The first end cap 200, the second end cap 400 and the housing 100 are connected to form a sealed storage cavity 110, so as to ensure the stability of the electrode assembly 300 in the storage cavity 110.

[0077] The electrode post 410 is located on the side of the second end cover 400 away from the first end cover 200, and the electrode post 410 is connected to the electrode assembly 300 so as to connect the electrode assembly 300 to the external carrier through the electrode post 410.

[0078] The connection method between the second end cap 400 and the housing 100 includes at least one of the following: snap-fit, adhesive, bolt connection, or integral connection.

[0079] This application provides a battery pack, including: a housing and individual battery cells 10, wherein the individual battery cells 10 are installed in the housing.

[0080] In this embodiment, individual battery cells 10 can be housed in a casing to form a battery pack. Alternatively, multiple individual battery cells 10 can be grouped into a battery module, and then the battery module can be housed in a casing to form a battery pack.

[0081] It is understood that the battery pack has the beneficial effects of the single cell 10 described in any of the above embodiments, which will not be elaborated here.

[0082] 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.

[0083] 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.

[0084] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A single-cell battery having intersecting first direction (X) and second direction (Y), characterized in that, include: The housing (100) defines a storage cavity (110) along the second direction (Y), and the housing (100) includes a first sidewall (120) and a second sidewall (130) disposed opposite to each other. An electrode assembly (300) is housed in the receiving cavity (110). The first end cap (200) is connected to the housing (100) along the first direction (X), and the first end cap (200) covers the receiving cavity (110). The first end cap (200) is provided with an explosion-proof valve (210). A pole post (410) is inserted through the housing (100) and is disposed opposite to the first end cap (200) along the first direction (X). The pole post (410) is connected to the electrode assembly (300). The first sidewall (120) protrudes in the direction away from the electrode assembly (300) along the second direction (Y) to form a first protrusion (121), and a first exhaust space (122) is formed on the side of the first sidewall (120) facing the electrode assembly (300), and the first exhaust space (122) is connected to the receiving cavity (110).

2. The single-cell battery according to claim 1, characterized in that, The second sidewall (130) protrudes in the direction away from the electrode assembly (300) along the second direction (Y) to form a second protrusion (131), and a second exhaust space (133) is formed on the side of the second sidewall (130) facing the electrode assembly (300), and the second exhaust space (133) communicates with the receiving cavity (110).

3. The single-cell battery according to claim 1, characterized in that, The single cell also has a third direction (Z) that intersects the first direction (X) and the second direction (Y) in pairs. Along the first direction (X), the length of the first protrusion (121) is less than the length of the first sidewall (120), and along the third direction (Z), the width of the first protrusion (121) is less than the width of the first sidewall (120).

4. The single-cell battery according to claim 3, characterized in that, The receiving cavity (110) is provided with a gap (124) along the second direction (Y). The gap (124) is located between the electrode assembly (300) and the first sidewall (120). The gap (124) extends along the first direction (X). The gap (124) is connected to one end of the receiving cavity (110) near the pole post (410) and to one end of the receiving cavity (110) near the explosion-proof valve (210). The first exhaust space (122) is connected to the gap (124).

5. The single-cell battery according to claim 4, characterized in that, The first end cap (200) protrudes in the direction away from the electrode assembly (300) along the first direction (X) to form a third protrusion (220). A cavity (500) is formed on the side of the first end cap (200) facing the electrode assembly (300). The explosion-proof valve (210) is disposed on the third protrusion (220). The first exhaust space (122) communicates with the cavity (500) through the gap (124).

6. The single-cell battery according to claim 4, characterized in that, The first sidewall (120) is provided with a plurality of first exhaust grooves (123) on the side facing the second sidewall (130). The first exhaust grooves (123) are recessed in the direction away from the electrode assembly (300) along the second direction (Y). The plurality of first exhaust grooves (123) are connected to the two ends of the first exhaust space (122) along the first direction (X). The first exhaust grooves (123) are connected to the gap (124).

7. The single-cell battery according to claim 2, characterized in that, The single cell also has a third direction (Z) that intersects the first direction (X) and the second direction (Y) in pairs. There are multiple first protrusions (121), and the multiple first protrusions (121) are arranged at intervals along the first direction (X). The length of the multiple first protrusions (121) along the first direction (X) is less than the length of the first sidewall (120). And / or, there are multiple second protrusions (131), and the multiple second protrusions (131) are spaced apart along the first direction (X), and the length of the multiple second protrusions (131) along the first direction (X) is less than the length of the second sidewall (130).

8. The single-cell battery according to claim 2, characterized in that, The single cell also has a third direction (Z) that intersects the first direction (X) and the second direction (Y); There are multiple first protrusions (121), and the multiple first protrusions (121) are arranged at intervals along the third direction (Z). The width of the multiple first protrusions (121) along the third direction (Z) is smaller than the width of the first sidewall (120). And / or, there are multiple second protrusions (131), and the multiple second protrusions (131) are spaced apart along the third direction (Z), and the width of the multiple second protrusions (131) along the third direction (Z) is smaller than the width of the second sidewall (130).

9. The single-cell battery according to claim 2, characterized in that, The side of the first protrusion (121) facing away from the second sidewall (130) is a plane, and the side of the second protrusion (131) facing away from the first sidewall (120) is a plane.

10. A battery pack, characterized in that, include: The single cell (10) according to any one of claims 1 to 9.

Images