Shell, battery, battery pack and electric equipment

Abstract

The utility model discloses a shell, a battery, a battery pack and electric equipment. The inner wall of the shell of the cylindrical battery is provided with the groove, and the volume of the cavity in the shell is increased to accommodate more electrolyte, so that the barren solution phenomenon of the battery caused by continuous increase of the diameter and the height is improved, the wettability of a battery cell in the electrolyte is further improved, and the cycle performance of the battery is improved. In addition, the inner wall of the shell is provided with the groove, cost is low, machining is simple, and large-scale production is easy. Furthermore, the weight and the cost of the shell can be reduced through the groove, and the energy density of the cylindrical battery is improved.

Description

TECHNICAL FIELD

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

[0002] Sufficient electrolyte is a necessary condition to maintain the cycle performance of the battery. However, as the battery is used for many times, the wettability of the electrolyte to the cell becomes poor, and the electrolyte is likely to have a problem of liquid depletion. As a result, the conduction of lithium ions between the positive and negative current collectors is limited, which can cause the internal resistance of the battery to increase and the cycle stability to decrease during long-term cycling. SUMMARY

[0003] The present application provides a shell, a battery, a battery pack and a power consumption device to solve the problem of liquid depletion of the battery.

[0004] In a first aspect, the embodiments of the present application provide a shell of a cylindrical battery, wherein an inner wall of the shell is provided with a groove.

[0005] In some embodiments, the groove extends along the height direction of the shell.

[0006] In some embodiments, the groove extends along the circumferential direction of the shell.

[0007] In some embodiments, the groove has the same depth in the radial direction of the shell.

[0008] In some embodiments, the groove has different depths in the radial direction of the shell.

[0009] In some embodiments, the groove has partially the same depth and partially different depth in the radial direction of the shell.

[0010] In some embodiments, the shell includes a first side and a second side opposite to each other in the height direction of the shell, and the size of the groove bottom wall in the circumferential direction of the shell gradually increases in the direction from the first side to the second side.

[0011] In some embodiments, the shell includes a first side and a second side opposite to each other in the height direction of the shell, and the size of the groove bottom wall in the circumferential direction of the shell gradually increases in the direction from the second side to the first side.

[0012] In some embodiments, the shell includes a first side and a second side opposite to each other in the height direction of the shell, and the size of the groove bottom wall in the circumferential direction of the shell is the same in the direction from the second side to the first side.

[0013] In some embodiments, the grooves include multiple grooves, which are spaced apart in the circumferential direction of the housing, and the distance between adjacent grooves in the circumferential direction of the housing ranges from 2 mm to 5 mm.

[0014] In some embodiments, the plurality of grooves are spaced apart in the height direction of the housing, and the distance between adjacent grooves in the height direction of the housing ranges from 2 mm to 5 mm.

[0015] In some embodiments, the depth of the groove in the radial direction of the housing is 20% to 50% of the housing thickness.

[0016] In some embodiments, the groove has openings, the total area of ​​which is 20% to 50% of the total area of ​​the inner wall of the housing.

[0017] In some embodiments, the projected shape of the groove on a projection plane perpendicular to the height direction of the housing is an arc, a triangle, a quadrilateral, or other polygon.

[0018] In some embodiments, the bottom wall of the groove is a plane.

[0019] In some embodiments, the bottom wall of the groove is curved.

[0020] Secondly, embodiments of this application provide a battery. The battery includes a casing and a cell as described in any of the above embodiments, with the cell housed within the casing.

[0021] In some embodiments, the battery further includes a first cover plate and a second cover plate. The housing has a first opening and a second opening at opposite ends in the height direction, respectively. The first cover plate is connected to one end of the housing and closes the first opening. The second cover plate is connected to the other end of the housing and closes the second opening. The first cover plate, the second cover plate, and the housing together form a cavity.

[0022] In some embodiments, the first cover plate has a first groove on the side near the battery cell, and the first groove may or may not be connected to a groove on the inner wall of the housing.

[0023] In some embodiments, the second cover plate has a second groove on the side near the battery cell, and the second groove may or may not be connected to a groove on the inner wall of the housing.

[0024] Thirdly, embodiments of this application provide a battery pack, the battery pack including the battery described in any of the above embodiments.

[0025] Fourthly, embodiments of this application provide an electrical device, which includes the battery described in any of the above embodiments, or includes the battery pack described in one of the above embodiments.

[0026] The casing, battery, battery pack, and electrical device provided in this application increase the volume of the inner cavity of the battery casing by creating grooves on the inner wall of the casing to accommodate more electrolyte, thereby effectively improving the problem of low electrolyte concentration, improving the wettability of the battery cells in the electrolyte, and enhancing the cycle performance of the battery. Furthermore, creating grooves on the inner wall of the casing is low-cost, simple to process, and easy to mass-produce. Moreover, the grooves can also reduce the weight and cost of the casing and increase the energy density of the battery.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the battery structure according to some embodiments of this application;

[0030] Figure 2 This is an exploded view of a battery according to certain embodiments of this application;

[0031] Figure 3 This is a partial structural diagram of the battery casing according to certain embodiments of this application;

[0032] Figure 4 yes Figure 3 The enlarged schematic diagram shown at point VII;

[0033] Figure 5 This is a top view of the housing according to certain embodiments of this application;

[0034] Figure 6 This is a schematic diagram of a battery pack according to certain embodiments of this application;

[0035] Figure 7 This is a schematic diagram of an electrical device according to certain embodiments of this application.

[0036] Explanation of key component designations:

[0037] Electrical equipment 10000; battery pack 1000; battery 100; housing 300; housing cover 301; housing body 303; first cover plate 11; second cover plate 13; housing 15; first opening 151; second opening 152; cavity 153; groove 155; first groove 1551; first side wall 1581; second groove 1553; second side wall 1583; slot 156; inner wall 157; side wall 158; outer wall 159; battery cell 17. Detailed Implementation

[0038] In the description of this application, some of the disclosed content has been illustrated 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 following description with reference to the accompanying drawings is exemplary and is only used to explain this application, and should not be construed as limiting this application.

[0039] This application discloses many different contents or examples for implementing different structures. To simplify the disclosure of this application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0040] 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 the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In the description of this application, it should be understood that the terms used to indicate orientation or positional relationship (such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc.) are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and understanding the corresponding embodiments, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to indicate orientation or positional relationship should not be construed as limitations on this application.

[0042] In the description of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. 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, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0044] Please see Figure 1 , Figure 2 and Figure 3 This application provides a battery 100, which includes a casing 15. It is understood that the battery 100 includes the casing 15, and therefore the battery 100 also has at least the beneficial effects of the casing 15. Specifically, the battery 100 of this application includes, but is not limited to, cylindrical batteries and prismatic batteries, etc., and will be described below as a cylindrical battery.

[0045] Please see Figure 1 , Figure 2 and Figure 3 In some embodiments, the battery 100 further includes a first cover plate 11, a second cover plate 13, and a battery cell 17. The opposite ends of the housing 15 are respectively provided with a first opening 151 and a second opening 152. The first cover plate 11 is connected to one end of the housing 15 and closes the first opening 151. The second cover plate 13 is connected to the other end of the housing 15 and closes the second opening 152. The first cover plate 11, the second cover plate 13, and the housing 15 together form a cavity 153. The inner wall 157 of the housing 15 is provided with a groove 155. The battery cell 17 is housed in the cavity 153.

[0046] The first cover plate 11 and the second cover plate 13 are components in the battery 100 used to seal the casing 15, so that the battery 100 forms a closed cavity 153 and accommodates the electrolyte and the battery cell 17. The first cover plate 11 and the second cover plate 13 are respectively connected to the positive and negative terminals of the battery cell 17. When the first cover plate 11 is connected to the positive terminal of the battery cell 17, the second cover plate 13 is connected to the negative terminal of the battery cell 17; when the first cover plate 11 is connected to the negative terminal of the battery cell 17, the second cover plate 13 is connected to the positive terminal of the battery cell 17. In this application, the first cover plate 11 is connected to the positive terminal of the battery cell 17, and the second cover plate 13 is connected to the negative terminal of the battery cell 17. In one example, the first cover plate 11 and the second cover plate 13 can be detachably connected to the battery cell 17, and the detachable connection methods include, but are not limited to, snap-fit ​​connections or threaded connections. In another example, the first cover plate 11 and the second cover plate 13 can be non-detachably connected to the battery cell 17, and the non-detachable connection methods include, but are not limited to, bonding or welding.

[0047] The housing 15 is a component in the battery 100 used to connect with the first cover plate 11 and the second cover plate 13 to form a closed cavity 153. In the battery 100, the housing 15 has a cylindrical structure, and in different embodiments, the height and radius of the housing 15 can be selected according to actual needs. In this application, the height of the housing 15 is in the Z direction. Either the first cover plate 11 or the second cover plate 13 can be integrally formed with the housing 15; in other embodiments, the housing 15, the first cover plate 11, and the second cover plate 13 can be separately formed. In the case of separate forming, in one example, the first cover plate 11 and the second cover plate 13 can be detachably connected to the housing 15, and the detachable connection methods include, but are not limited to, snap-fit ​​connections or threaded connections. In another example, the first cover plate 11 and the second cover plate 13 can be non-detachably connected to the housing 15, and the non-detachable connection methods include, but are not limited to, bonding or welding.

[0048] The battery cell 17 is generally longitudinally wound and is used to store and release electrical energy, converting electrical energy into chemical energy through a chemical reaction. The battery cell 17 mainly includes a negative electrode, a positive electrode, and a separator. The separator is located between adjacent negative and positive electrodes to separate them. In one possible design, the negative electrode, separator, and positive electrode are sequentially stacked and wound to form the battery cell 17, i.e., the battery cell 17 has a wound structure. Simultaneously, the battery cell 17 has gaps after formation, allowing electrolyte to enter the battery cell 17 and wet the negative and positive electrodes. The negative electrode includes a negative current collector (e.g., copper foil) and a negative active material layer (e.g., carbon or silicon) coated on the surface of the negative current collector. The positive electrode includes a positive current collector (e.g., aluminum foil) and a positive active material layer (e.g., ternary material, lithium iron phosphate, or lithium cobalt oxide) coated on the surface of the positive current collector. The cavity 153 contains the electrolyte. The electrolyte is used to wet the battery cell 17, ensuring that ions can move freely during the charging and discharging process of the battery 100. The electrolyte includes, but is not limited to, lithium salt electrolyte, organic solvents, and additives.

[0049] The inner wall 157 of the housing 15 is provided with a groove 155 to increase the volume of the inner cavity 153 of the housing 15 to accommodate more electrolyte. The number of grooves 155 can be one or more.

[0050] The housing 15 provided in this application, by providing a groove 155 on the inner wall 157 of the housing 15, increases the volume of the inner cavity 153 of the housing 15 to accommodate more electrolyte, thereby effectively improving the electrolyte deficiency phenomenon that occurs as the diameter and height of the battery 100 increase, improving the wettability of the cell 17 in the electrolyte, and enhancing the cycle performance of the battery 100. Furthermore, providing the groove 155 on the inner wall 157 of the housing 15 is low-cost, simple to process, and easy to mass-produce. Even further, the groove 155 can also reduce the weight and cost of the housing 15 and increase the energy density of the battery 100. It is understood that the battery 100 includes the housing 15, therefore, the battery 100 at least includes the beneficial effects of the housing 15.

[0051] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, the groove 155 extends along the height direction Z of the housing 15.

[0052] Specifically, in some examples, the groove 155 can extend continuously from the first opening 151 of the housing 15 along the height direction Z of the housing 15 to the second opening 152. In this case, the groove 155 extending continuously from the first opening 151 to the second opening 152 of the housing 15 can penetrate the entire height of the housing 15, thereby forming a continuous volume-increasing region inside the battery 100 to accommodate more electrolyte. In other examples, the groove 155 can also extend from the first opening 151 of the housing 15 along the height direction Z of the housing 15 to a predetermined position on the inner wall 157 of the housing 15. The predetermined position is closer to the first opening 151 in the height direction Z of the housing 15 than the second opening 152. In still other examples, the groove 155 can also extend from the second opening 152 of the housing 15 along the height direction Z of the housing 15 to a predetermined position on the inner wall 157 of the housing 15. The predetermined position is closer to the second opening 152 in the height direction Z of the housing 15 than the first opening 151. In some other examples, the groove 155 may also extend along the height direction Z of the housing 15 from the non-first opening 151 and non-second opening 152 of the housing 15 to the inner wall 157 of the housing 15 from the non-first opening 151 and non-second opening 152.

[0053] The groove 155 extending along the height direction Z of the housing 15 can increase the volume of the cavity 153, allowing the battery 100 to hold more electrolyte, which helps to improve the wettability and electrochemical properties of the battery 100. On the other hand, the groove 155 extending along the height direction Z of the housing 15 is easy to form and convenient to manufacture.

[0054] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, the groove 155 extends along the circumferential direction R of the housing 15.

[0055] Specifically, the groove 155 can extend along the circumferential direction R of the housing 15, covering any arc, thereby forming a continuous annular or arc-shaped structure. The groove 155 extending along the height direction Z of the housing 15 can increase the volume of the cavity 153, allowing the battery 100 to hold more electrolyte.

[0056] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, the groove 155 has the same depth in the radial direction of the housing 15.

[0057] In the embodiment of this application where battery 100 is a cylindrical battery, the radial direction is a straight line along the diameter or radius, and also a direction perpendicular to the circumferential direction R. The uniform depth of the grooves 155 facilitates the uniform distribution of the electrolyte, thereby ensuring uniform wetting of all parts of the cell 17. Furthermore, the uniform depth of the grooves 155 simplifies manufacturing and improves production efficiency.

[0058] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, the depth of the groove 155 in the radial direction of the housing 15 is not uniform.

[0059] The depth of the groove 155 varies in the radial direction of the housing 15, so that the battery 100 can accommodate grooves 155 of different depths according to the different electrolyte requirements of different parts of the cell 17. For example, in areas of the cell 17 where less electrolyte is required, the depth of the groove 155 is reduced, thereby ensuring the thickness of the housing 15 and improving the structural strength of the battery 100.

[0060] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, the grooves 155 have the same depth in the radial direction of the housing 15, but some are different.

[0061] In this way, grooves 155 of different depths can be made according to the different electrolyte requirements of different parts of the battery cell 17. For example, in areas of the battery cell 17 that require more electrolyte (such as areas with electrical connections), the depth of the grooves 155 is increased, thereby improving the wettability of the electrolyte.

[0062] Please see Figure 2 , Figure 3 and Figure 5 In one embodiment, the housing 15 includes a first side and a second side facing away from each other in the height direction Z of the housing 15. In the direction from the first side to the second side, the bottom wall of the groove 155 gradually increases in size in the circumferential direction R of the housing 15. Alternatively, in another embodiment, in the direction from the second side to the first side, the bottom wall of the groove 155 gradually increases in size in the circumferential direction of the housing; that is, along the height direction Z of the housing 15, the flow area of ​​the groove 155 gradually increases. The first side is the side closest to the first cover plate 11, and the second side is the side closest to the second cover plate 13.

[0063] Specifically, along the height direction Z of the housing 15, the flow area of ​​the groove 155 gradually increases, which gradually increases the volume of the groove 155, allowing the cavity 153 to hold more electrolyte. More specifically, in some examples, the flow area of ​​the groove 155 gradually increases from the second opening 152 to the first opening 151. In this case, the closer to the first opening 151 (the upper part of the battery 100) in the cavity 153, the more electrolyte there is. When the electrolyte contains multiple components, this design ensures that the content of various components in the electrolyte at the upper part of the battery 100 does not differ too much from that in the electrolyte at the middle and lower parts due to gravity. In other examples, the flow area of ​​the groove 155 gradually increases from the first opening 151 to the second opening 152. This increases the flow range of the electrolyte in the groove 155 during electrolyte injection, allowing the electrolyte to flow into the cavity 153 more quickly, thereby improving the injection efficiency.

[0064] Please see Figure 2 , Figure 3 and Figure 5 In some embodiments, along the height direction Z of the housing 15, the bottom wall of the groove 155 has the same dimensions in all directions of the circumference R of the housing 15.

[0065] Specifically, in the direction from the first opening 151 to the second opening 152, the bottom wall of the groove 155 has the same dimension in the circumferential direction R of the housing 15, so that the flow area of ​​the groove 155 is the same everywhere. This simplifies the manufacturing process of the groove 155 and helps to achieve a more uniform distribution of electrolyte inside the battery 100, allowing the electrolyte to more evenly wet the cell 17.

[0066] Please see Figure 2 In some embodiments, there are multiple grooves 155, which are spaced apart on the circumferential R of the housing 15, and the distance between adjacent grooves 155 on the circumferential R of the housing 15 is in the range of [2mm, 5mm].

[0067] Specifically, the number of grooves 155 can be two or more. The spacing between adjacent grooves 155 in the circumferential direction R of the housing 15 refers to the shortest straight-line distance between the nearest sidewalls 158 of two adjacent grooves 155. For example, the grooves 155 include adjacent first grooves 1551 and second grooves 1553. The first groove 1551 includes two first sidewalls 1581, and the second groove 1553 includes two second sidewalls 1583. The spacing between adjacent first grooves 1551 and second grooves 1553 in the circumferential direction R of the housing 15 is the distance S1 between the first sidewall 1581 closest to the second groove 1553 and the second sidewall 1583 closest to the first groove 1551.

[0068] In some embodiments, the spacing between adjacent grooves 155 of the same battery 100 on the circumferential R of the housing 15 can all be the same. For example, the spacing between adjacent grooves 155 of the same battery 100 on the circumferential R of the housing 15 can all be 3 mm. In other embodiments, the spacing between adjacent grooves 155 of the same battery 100 on the circumferential R of the housing 15 can all be different. For example, the spacing between adjacent grooves 155 on the circumferential R of the housing 15 can increase from any groove 155. For example, the first spacing S1 is between the first groove 1551 and the second groove 1553, the second spacing S2 is between the second groove 1553 and the third groove, the third spacing S3 is between the third groove and the fourth groove, and so on. If there are a total of n grooves 155, there are n-1 spacings, Sn-2 < Sn-1, where n ≥ 3. In still some embodiments, the spacing between adjacent grooves 155 of the same battery 100 on the circumferential R of the housing 15 can be partially the same and partially different. For example, in the same battery 100, the spacing between adjacent grooves 155 on the circumferential R of the casing 15 can be 2mm or 4mm. The distribution of these two spacings includes, but is not limited to, intermittent distribution, random distribution, and regional distribution. Intermittent distribution can be exemplified as follows: the first spacing S1 is 2mm, the second spacing S2 is 4mm, the third spacing S3 is 2mm, the fourth spacing S4 is 4mm, and so on, concluding that odd-numbered spacings are 2mm and even-numbered spacings are 4mm. Random distribution refers to an irregular pattern, such as S1 = S2 = S3 = 2mm, S4 = 4mm, S5 = 2mm, S5 = S6 = 4mm. Regional distribution refers to dividing the grooves 155 into regions based on the spacing. For example, assuming there are 10 grooves 155, the first to fifth grooves are arranged adjacently to form the first region, with S1 = S2 = S3 = S4 = 2mm, and the sixth to tenth grooves are arranged adjacently to form the second region, with S5 = S6 = S7 = S8 = S9 = 4mm. In the embodiments of this application, the spacing between adjacent grooves 155 on the circumferential R of the housing 15 is the same.

[0069] Please see Figure 3 , Figure 5 and Figure 2The spacing between adjacent grooves 155 on the circumferential radius R of the housing 15 can be 2mm, 2.3mm, 2.4mm, 3mm, 3.2mm, 3.3mm, 3.4mm, 4mm, 4.4mm, or 5mm. If the spacing between adjacent grooves 155 on the circumferential radius R of the housing 15 is less than 2mm, the distance between the bottom wall of the groove 155 and the outer wall 159 of the housing 15 will be too small, meaning the gap between the bottom wall of the groove 155 and the outer wall 159 of the housing 15 will be too thin, affecting the strength of the housing 15 and making it prone to damage. If the spacing between adjacent grooves 155 on the circumferential radius R of the housing 15 is greater than 5mm, the number of grooves 155 provided on the housing 15 will be limited, resulting in wasted space, and the volume of a single groove 155 will be insufficient, preventing it from holding enough electrolyte. The spacing between adjacent grooves 155 on the circumferential R of the housing 15 ranges from [2mm, 5mm]. The grooves 155 can not only increase the volume of the cavity 153 to accommodate the electrolyte, but also ensure the thickness between the bottom wall of the groove 155 and the outer wall 159 of the housing 15, thus ensuring the strength of the housing 15 and extending the service life of the housing 15.

[0070] Please see Figure 3 , Figure 5 and Figure 2 In some embodiments, there are multiple grooves 155, which are spaced apart in the height direction Z of the housing 15, and the spacing between adjacent grooves 155 in the height direction Z of the housing 15 ranges from 2mm to 5mm.

[0071] The spacing between adjacent grooves 155 in the height direction Z of the housing 15 can be 2mm, 2.3mm, 2.4mm, 3mm, 3.2mm, 3.3mm, 3.4mm, 4mm, 4.4mm or 5mm.

[0072] If the distance between adjacent grooves 155 in the height direction Z of the housing 15 is less than 2mm, the sidewall 158 of the groove 155 will be too thin, affecting the strength of the housing 15 and making it prone to damage. If the distance between adjacent grooves 155 in the height direction Z of the housing 15 is greater than 5mm, the number of grooves 155 on the housing 15 will be limited, resulting in wasted space and insufficient volume of a single groove 155, which cannot hold enough electrolyte. The distance between adjacent grooves 155 in the height direction Z of the housing 15 is in the range of [2mm, 5mm]. The grooves 155 can both increase the volume of the cavity 153 to hold electrolyte and ensure the thickness of the sidewall 158 of the groove 155, ensuring the strength of the housing 15 and extending the service life of the housing 15.

[0073] Please see Figure 3 , Figure 6 and Figure 2In some embodiments, the depth of each groove 155 in the radial direction of the housing 15 is the same along the height direction Z of the battery 100. In this case, the depth of the plurality of grooves 155 in the radial direction of the housing 15 is the same.

[0074] Specifically, having all grooves 155 at the same radial depth in the housing 15 ensures consistent mechanical strength of the housing 15 at each groove 155, simplifies the manufacturing process, and facilitates uniform distribution of electrolyte within the cavity 153.

[0075] Please see Figure 3 , Figure 7 and ​ In other embodiments, the depth of each groove 155 in the radial direction of the housing 15 is the same along the height direction Z of the battery 100. In this case, the depths of the plurality of grooves 155 in the radial direction of the housing 15 are not the same.

[0076] Specifically, the depths of multiple grooves 155 in the radial direction of the housing 15 of the same battery 100 can all be different. For example, the depths of different grooves 155 in the radial direction of the housing 15 can increase from any groove 155. For example, the depths of adjacent grooves 155 in the radial direction of the housing 15 can increase from any groove 155. For example, the first groove 1551 has a first depth H1, the second groove 1553 has a first depth H2, the third groove has a third depth H3, the fourth groove has a fourth depth H4, and so on. If there are a total of n grooves 155, then their depth is Hn, Hn-2 < Hn-1 < Hn, where n ≥ 3.

[0077] In some embodiments, the radial depths of adjacent grooves 155 of the same battery 100 in the housing 15 may be partially the same and partially different. For example, in the same battery 100, the radial depths of adjacent grooves 155 in the housing 15 may be 2 mm and 4 mm. The distribution of these two spacings includes, but is not limited to, intermittent distribution, random distribution, and regional distribution. An intermittent distribution can be exemplified as follows: the first depth H1 is 2 mm, the second depth H2 is 4 mm, the third depth H3 is 2 mm, the fourth depth H4 is 4 mm, and so on, resulting in odd-numbered depths of 2 mm and even-numbered depths of 4 mm. A random distribution refers to a random pattern, such as H1 = H2 = H3 = 2 mm, H4 = 4 mm, H5 = 2 mm, H5 = H6 = 4 mm. Regional distribution refers to dividing the grooves 155 into regions according to their depth. For example, assuming there are 10 grooves 155 in total, the first groove 1551 to the fifth groove are arranged adjacently to form a first region, and H1=H2=H3=H4=H5=2mm; the sixth groove to the tenth groove are arranged adjacently to form a second region, and H6=H7=H8=H9=H10=4mm. In the embodiments of this application, the depth of adjacent grooves 155 in the radial direction of the housing 15 is the same. The different depths of the grooves 155 in the radial direction of the housing 15 allow the housing 15 to better adapt to the different electrolyte requirements of different positions of the battery cell 17.

[0078] Please see ​ and ​ In some embodiments, the depth of the groove 155 in the radial direction of the housing 15 is 20% to 50% of the thickness of the housing 15.

[0079] Specifically, the radial depth of the groove 155 in the housing 15 can be 20%, 23%, 24%, 3%, 32%, 33%, 34%, 4%, 44%, or 50% of the thickness of the housing 15. If the radial depth of the groove 155 in the housing 15 is less than 20%, the volume of a single groove 155 will be insufficient, and the groove 155 will not be able to hold enough electrolyte. If the radial depth of the groove 155 in the housing 15 is greater than 50%, the distance between the bottom wall of the groove 155 and the outer wall 159 of the housing 15 will be too small, that is, the gap between the bottom wall of the groove 155 and the outer wall 159 of the housing 15 will be too thin, affecting the strength of the housing 15 and making the housing 15 prone to damage. When the depth of the groove 155 in the radial direction of the housing 15 is 20% to 50% of the thickness of the housing 15, the groove 155 can not only increase the volume of the cavity 153 to accommodate the electrolyte, but also ensure the thickness between the bottom wall of the groove 155 and the outer wall 159 of the housing 15, thus ensuring the strength of the housing 15 and extending the service life of the housing 15.

[0080] Please see ​ and ​In some embodiments, the groove 155 has a slot 156, the total area of ​​which is 20% to 50% of the total area of ​​the inner wall 157 of the housing 15.

[0081] Specifically, the groove 156 of the groove 155 refers to the opening opposite the bottom wall of the groove 155. The total area of ​​the groove 156 is the sum of the surface areas of all the groove 156 of the grooves 155. The total area of ​​the groove 156 can be 20%, 23%, 24%, 3%, 32%, 33%, 34%, 4%, 44%, or 50% of the total area of ​​the inner wall 157 of the housing 15. If the total area of ​​the groove 156 is less than 20% of the total area of ​​the inner wall 157 of the housing 15, the contact area between the electrolyte in the groove 155 and the battery cell 17 will be too small, resulting in insufficient electrolyte wetting. If the total area of ​​the groove 156 is greater than 50% of the total area of ​​the inner wall 157 of the housing 15, the gap between the bottom wall of the groove 155 and the outer wall 159 of the housing 15 will be too thin, affecting the strength of the housing 15. When the depth of the groove 155 in the radial direction of the housing 15 is 20% to 50% of the thickness of the housing 15, the groove 155 can not only increase the volume of the cavity 153 to accommodate the electrolyte, but also ensure the thickness between the bottom wall of the groove 155 and the outer wall 159 of the housing 15, thereby ensuring the strength of the housing 15 and extending the service life of the housing 15.

[0082] In some embodiments, the projected shape of the groove 155 M on the projection plane perpendicular to the height direction Z is a circle, ellipse, triangle, quadrilateral, or other polygon, thereby adapting to the needs of different batteries 100. In some embodiments, the bottom wall of the groove 155 is flat, thus simplifying the construction of the groove 155 and making it easy to form. In some embodiments, the bottom wall of the groove 155 is curved. A curved surface can increase the area of ​​the bottom wall and improve heat dissipation. The curvature of the bottom surface of the same groove 155 can be the same, different, or partially the same and partially different. In this way, the battery 100 can adjust the bottom wall of the groove 155 according to the needs of different areas of the cell, thereby adapting to the needs of different batteries 100.

[0083] Please see ​ and ​ In some embodiments, the first cover plate 11 has a first groove (not shown) on the side near the battery cell 17. The first groove on the first cover plate 11 may or may not be connected to the groove 155 on the inner wall of the housing 15.

[0084] Specifically, the first cover plate 11 is provided with a first groove, which can further increase the internal volume of the cavity 153, thereby accommodating more electrolyte and improving the problem of electrolyte deficiency. The first groove on the first cover plate 11 may or may not be connected to the groove 155 on the inner wall of the housing 15. When the first groove on the first cover plate 11 is connected to the groove 155 on the inner wall of the housing 15, during the electrolyte injection process, the first groove on the first cover plate 11 can guide the electrolyte into the first groove on the first cover plate 11, and then guide it to the groove 15 on the inner wall of the housing 15. The electrolyte can be injected into all parts of the cavity 153 more quickly and evenly, thereby improving the injection efficiency and injection effect.

[0085] Please see ​ and ​ In some embodiments, the second cover plate 13 has a second groove (not shown) on the side near the battery cell 17. The second groove on the second cover plate 13 may or may not be connected to the groove 155 on the inner wall of the housing 15.

[0086] Specifically, the second cover plate 13 is provided with a second groove, which can further increase the internal volume of the cavity 153, thereby accommodating more electrolyte and improving the problem of electrolyte deficiency. The second groove on the second cover plate 13 may or may not be connected to the groove 155 on the inner wall of the housing 15. When the second groove on the second cover plate 13 is connected to the groove 155 on the inner wall of the housing 15, during the electrolyte injection process, the electrolyte flows to the groove 155 on the inner wall of the housing 15 and is then guided into the cavity 153 through the second groove on the second cover plate 13, thereby accelerating the electrolyte injection speed and improving the electrolyte injection efficiency and effect.

[0087] Please see ​ , ​ and ​ Secondly, embodiments of this application provide a battery pack 1000, which includes the battery 100 of any of the above embodiments.

[0088] Specifically, the battery pack 1000 of this application can be charged and store electrical energy, and can also be discharged to power other external devices. The battery pack 1000 includes batteries 100 and a housing 300. The battery pack 1000 includes multiple batteries 100. The housing 300 is used to provide a receiving space for the batteries 100, and the housing 300 can adopt various structures. In some embodiments, the housing 300 may include a cover 301 and a body 303, the cover 301 and the body 303 covering each other, and the cover 301 and the body 303 together define a receiving space for receiving the batteries 100. The box body 303 can be a hollow structure with one open end, and the box lid 301 can be a plate-like structure. The box lid 301 closes onto the open side of the box body 303 so that the box lid 301 and the box body 303 together define the storage space. Alternatively, both the box lid 301 and the box body 303 can be hollow structures with one open side, with the open side of the box lid 301 closing onto the open side of the box body 303. The box body 300 formed by the box lid 301 and the box body 303 can be of various shapes, such as a cylinder or a cuboid.

[0089] The battery pack 1000 increases the volume of the inner cavity 153 of the housing 15 by providing grooves 155 in the inner wall 157 of the battery 100, thereby accommodating more electrolyte. This effectively improves the electrolyte deficiency phenomenon that occurs as the diameter and height of the battery 100 increase, improves the wettability of the cell 17 in the electrolyte, and enhances the cycle performance of the battery 100. Furthermore, providing grooves 155 in the inner wall 157 of the housing 15 is low-cost, simple to process, and easy to mass-produce. Moreover, the grooves 155 can also reduce the weight and cost of the housing 15 and increase the energy density of the battery 100.

[0090] Please see ​ , ​ and ​ This application provides an electrical device 10000, which includes a battery 100 of any of the above embodiments, or a battery pack 1000 of the above embodiments.

[0091] Specifically, the battery 100 disclosed in this application can be used in electrical devices 10000 that use the battery pack 1000 as a power source. The electrical device 10000 can be, but is not limited to, electric vehicles, power tools, mobile phones, ships, or spacecraft, etc. Spacecraft can include drones, rockets, space shuttles, etc. This application only uses a vehicle as an example for illustration; the vehicle can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The battery pack 1000 is installed inside the vehicle and can be located at the bottom, front, or rear of the vehicle. The battery pack 1000 can be used to power the vehicle; for example, the battery pack 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery pack 1000 to supply power to the motor 3000, for example, to meet the power needs of the vehicle during starting, navigation, and driving. In some implementations, the battery pack 1000 can serve not only as the operating power source for the vehicle, but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0092] The electrical device 10000 increases the volume of the inner cavity 153 of the battery 100 by providing a groove 155 in the inner wall 157 of the battery casing 15 to accommodate more electrolyte. This effectively improves the electrolyte deficiency phenomenon that occurs as the diameter and height of the battery 100 increase, improves the wettability of the cell 17 in the electrolyte, and enhances the cycle performance of the battery 100. Furthermore, providing a groove 155 in the inner wall 157 of the casing 15 is low-cost, simple to process, and easy to mass-produce. Moreover, the groove 155 can also reduce the weight and cost of the casing 15 and increase the energy density of the battery 100.

[0093] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to the embodiments of this application without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A casing for a cylindrical battery, characterized in that, The inner wall of the housing is provided with a groove to form a first region and a second region. The first region is the area where the groove is located, and the second region is the area other than the groove. The wall thickness of the second region is greater than the wall thickness of the first region.

2. The housing according to claim 1, characterized in that, The groove extends along the height direction of the housing; and / or The groove extends circumferentially along the housing.

3. The housing according to claim 1, characterized in that, The grooves have the same depth in the radial direction of the housing; or The depth of the groove in the radial direction of the housing is not uniform at different locations; or The grooves have a partially equal depth and a partially different depth in the radial direction of the housing.

4. The housing according to claim 2, characterized in that, The housing includes a first side and a second side facing away from each other in the height direction of the housing, and the dimension of the bottom wall of the groove gradually increases in the circumferential direction of the housing in the direction from the first side to the second side; or The housing includes a first side and a second side facing away from each other in the height direction of the housing, and the dimension of the bottom wall of the groove gradually increases in the circumferential direction of the housing in the direction from the second side to the first side; or The housing includes a first side and a second side facing away from each other in the height direction of the housing, and the bottom wall of the groove has the same dimension in the circumferential direction of the housing in the direction from the second side to the first side.

5. The housing according to claim 2, characterized in that, The groove includes multiple grooves. The plurality of grooves are spaced apart on the circumference of the housing, and the spacing between adjacent grooves on the circumference of the housing ranges from [2mm, 5mm], and / or The plurality of grooves are spaced apart in the height direction of the housing, and the spacing between adjacent grooves in the height direction of the housing ranges from 2mm to 5mm.

6. The housing according to claim 1, characterized in that, The depth of the groove in the radial direction of the housing is 20% to 50% of the thickness of the housing.

7. The housing according to claim 1, characterized in that, The groove has an opening, and the total area of ​​the opening is 20% to 50% of the total area of ​​the inner wall of the shell.

8. The housing according to claim 1, characterized in that, On a projection plane perpendicular to the height of the housing, the projected shape of the groove is an arc, a triangle, a quadrilateral, or other polygons.

9. The housing according to claim 1, characterized in that, The bottom wall of the groove is a plane; and / or, The bottom wall of the groove is curved.

10. A battery, characterized in that, include: The housing as described in any one of claims 1-9; and A battery cell, wherein the battery cell is housed within the housing.

11. The battery according to claim 10, characterized in that, The battery also includes: A first cover plate; the housing has a first opening and a second opening at opposite ends in the height direction, the first cover plate is connected to one end of the housing and closes the first opening; and The second cover plate is connected to the other end of the housing and closes the second opening. The first cover plate, the second cover plate, and the housing together form a cavity.

12. The battery according to claim 11, characterized in that, The first cover plate has a first groove on the side near the battery cell, and the first groove may or may not be connected to a groove on the inner wall of the housing; and / or, The second cover plate has a second groove on the side near the battery cell. The second groove may or may not be connected to the groove on the inner wall of the housing.

13. A battery pack, characterized in that, Includes the battery as described in any one of claims 11-12.

14. An electrical appliance, characterized in that, It includes the battery as described in any one of claims 11-12, or the battery pack as described in claim 13.

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