Battery cell housing, battery cell, and battery device

Abstract

The utility model discloses a kind of shell of battery monomer, battery monomer and battery device, the shell has first shell wall, in the direction from first shell wall along two ends in first direction to middle part, the wall thickness of at least partial first shell wall gradually increases, and / or, in the direction from first shell wall along two sides in second direction to middle part, the wall thickness of at least partial first shell wall gradually increases, first direction and second direction are perpendicular.According to the shell of battery monomer of the utility model, the wall thickness of first shell wall in middle region can be increased, the structural strength of first shell wall in middle region is improved, so as to improve the anti-deformation ability and impact resistance of middle region of first shell wall, the thickness of first shell wall in rim region can also be thinned, increase the electrolyte containing space in shell, improve electrolyte content, improve the cycle performance of battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell housing, a battery cell, and a battery device. Background Technology

[0002] With the widespread use of electronic devices, batteries, as crucial energy supply devices, are receiving increasing attention for their electrochemical performance and safety. Currently, continuous optimization of battery structure is key to improving various battery performance aspects. The aluminum casing, as a critical structural component, not only seals the battery but also significantly impacts its safety. However, the performance of commonly used aluminum casings in handling the expansion stress caused by cell cycling still needs improvement. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a casing for a battery cell that improves its resistance to deformation and impact, increases the electrolyte capacity within the casing, enhances the electrolyte content, and improves the cycle performance of the battery cell.

[0004] This utility model also proposes a battery cell with a casing having the above-mentioned battery cell.

[0005] This utility model also proposes a battery device having the above-mentioned battery cells.

[0006] According to the first aspect of the present invention, the housing of a battery cell has a first shell wall, wherein at least a portion of the thickness of the first shell wall gradually increases in a direction from both ends toward the center along a first direction, and / or, at least a portion of the thickness of the first shell wall gradually increases in a direction from both sides toward the center along a second direction, wherein the first direction and the second direction are perpendicular.

[0007] According to the battery cell casing of this utility model, by gradually increasing the thickness of at least a portion of the first shell wall in the direction from both ends toward the middle in the first and / or second directions, the thickness of the first shell wall can exhibit a thickness distribution state of gradually increasing and then gradually decreasing in the first and / or second directions. This increases the thickness of the first shell wall in the middle region, improving its structural strength and thus enhancing its resistance to deformation and impact. Conversely, it reduces the thickness of the first shell wall at the edges, thereby reducing material usage and space occupied in these areas, increasing the electrolyte capacity within the casing, increasing electrolyte content, and improving the cycle performance of the battery cell. Furthermore, by gradually increasing the thickness of at least a portion of the first shell wall from both ends toward the middle, the thickness of the first shell wall can be gradually varied, thereby reducing stress concentration, lowering the risk of cracking, and extending the service life of the first shell wall.

[0008] In some embodiments, the first shell wall includes a constant thickness region and a gradient region, wherein the wall thickness of the constant thickness region is equal everywhere, and the gradient region surrounds the periphery of the constant thickness region, wherein the thickness of the gradient region gradually increases in a direction from the periphery of the first shell wall toward the center.

[0009] In some embodiments, in the first direction, the ratio of the length of the equal-thickness region to the length of the first shell wall is 1 / 2 to 2 / 3; and / or, in the second direction, the ratio of the height of the equal-thickness region to the height of the first shell wall is 1 / 2 to 2 / 3.

[0010] In some embodiments, the first shell wall is provided with a plurality of reinforcing protrusions.

[0011] In some embodiments, the reinforcing protrusion is provided on the side surface of the first shell wall facing the inside of the shell, and the protrusion height of the reinforcing protrusion is 0.1mm-0.3mm.

[0012] In some embodiments, the housing includes a housing body and an end cap, the housing body being open on one side in the second direction, the end cap covering the open side of the housing body, a reinforcing protrusion being formed on the housing body, and in the second direction, the distance between the reinforcing protrusion and the end edge of the housing body facing the end cap being a first distance, the ratio of the first distance to the height of the first housing wall in the second direction being 0.05-0.15.

[0013] In some embodiments, the height of the plurality of reinforcing protrusions disposed on one end of the shell body near the end cap gradually increases in the direction from the end cap toward the shell body.

[0014] In some embodiments, the cross-sectional area of ​​the reinforcing protrusion gradually decreases in the protrusion direction of the reinforcing protrusion.

[0015] In some embodiments, the angle between the peripheral surface of the reinforcing protrusion and a third direction is 30°-40°, and the third direction is perpendicular to the first direction and the second direction.

[0016] In some embodiments, a plurality of the reinforcing protrusions are arrayed on the first shell wall; or, the cross-section of the reinforcing protrusion perpendicular to the third direction is circular or square, and the third direction is perpendicular to the first direction and the second direction; or, the reinforcing protrusion extends along the first direction in a long strip shape, and the two ends of the reinforcing protrusion extend to the two ends of the first shell wall respectively.

[0017] In some embodiments, the first shell wall is the shell wall with the largest area among the side walls of the shell.

[0018] The battery cell according to the second aspect of the present invention includes the housing of the battery cell according to the first aspect of the present invention.

[0019] According to the present invention, the overall performance of the battery cell is improved by providing the casing of the battery cell described in the first aspect.

[0020] The battery device according to the third aspect of the present invention includes a battery cell according to the second aspect of the present invention.

[0021] According to the present invention, the battery device improves the overall performance of the battery device by providing the battery cells described in the second aspect.

[0022] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the casing of a battery cell according to some embodiments of the present invention; Figure 3 This is a structural schematic diagram of the housing of a battery cell according to other embodiments of the present invention; Figure 4 This is a cross-sectional view of the first shell wall of the battery cell according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the first shell wall of the shell according to some embodiments of the present invention; Figure 6 yes Figure 5 A cross-sectional view of the first shell wall shown in the figure; Figure 7 This is a structural schematic diagram of the first shell wall of the housing according to other embodiments of the present invention; Figure 8 yes Figure 7 A cross-sectional view of the first shell wall shown in the figure; Figure 9 This is a schematic diagram of the structure of the first shell wall of the shell according to some embodiments of the present invention; Figure 10 yes Figure 9 The first shell wall shown is a cross-sectional view.

[0024] Figure label: 100. Battery cell; 10. Casing; 11. Casing body; 12. End cap; 111. First casing wall; 112. Reinforcing protrusion; 1111, Equal thickness zone; 1112, Gradient zone; 113, Positioning groove. Detailed Implementation

[0025] The embodiments of this utility model 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] The following is for reference. Figures 1-8 The casing 10 of the battery cell 100 according to a first aspect embodiment of the present invention is described.

[0027] like Figure 1 and Figure 2 As shown, the housing 10 of the battery cell 100 according to the first aspect embodiment of the present invention has a first housing wall 111, and the housing 10 has a first housing wall 111 along a first direction (e.g.) from the first housing wall 111. Figure 1 In the direction from both ends toward the middle (as shown in the left-right direction), at least part of the thickness of the first shell wall 111 gradually increases, and / or, along the second direction (e.g., from the first shell wall 111)... Figure 1 The thickness of at least part of the first shell wall 111 gradually increases in the direction from the top and bottom (as shown in the diagram) toward the middle, and the first direction and the second direction are perpendicular to each other.

[0028] In other words, in the first direction, only a portion of the thickness of the first shell wall 111 gradually increases from both ends to the middle, or in the first direction, the thickness of the first shell wall 111 gradually increases from both ends to the middle. In the second direction, only a portion of the thickness of the first shell wall 111 gradually increases from both ends to the middle, or in the second direction, the thickness of the first shell wall 111 gradually increases from both ends to the middle. In the first direction, the thickness of a portion or all of the first shell wall 111 gradually increases from both ends to the middle, and in the second direction, the thickness of a portion or all of the first shell wall 111 gradually increases from both ends to the middle.

[0029] In the first direction and / or the second direction, the wall thickness of at least a portion of the first shell wall 111 gradually increases from both ends to the middle. This can be a step-like gradual increase in the wall thickness of at least a portion of the first shell wall 111, or a continuous gradual increase in the wall thickness of at least a portion of the first shell wall 111. Alternatively, the wall thickness of the first shell wall 111 can gradually increase from both ends to the center of the middle, or only a portion of the wall thickness of the first shell wall 111 can gradually increase in the direction from both ends to the middle.

[0030] For example Figure 1 As shown, the housing 10 has a third-party orientation (e.g.) Figure 1 Two first shell walls 111 arranged opposite each other in the front-back direction shown in the diagram, along a first direction (e.g., from the first shell wall 111 along a first direction) Figure 1 In the direction from both ends toward the middle (as shown in the left-right direction), the wall thickness of a portion of the first shell wall 111 gradually increases, and from the first shell wall 111 along the second direction (e.g., Figure 1 In the direction from the top and bottom (as shown), the thickness of a portion of the first shell wall 111 gradually increases in the direction from both sides toward the middle, and the third direction, the first direction, and the second direction are perpendicular to each other.

[0031] According to an embodiment of the present invention, the casing 10 of the battery cell 100 has a gradually increasing wall thickness at least a portion of the first casing wall 111 in the direction from both ends toward the middle in the first and / or second directions. This allows the wall thickness of at least a portion of the first casing wall 111 to exhibit a gradually increasing and then gradually decreasing wall thickness distribution in the first and / or second directions. This increases the wall thickness of the first casing wall 111 in the middle region, improves the structural strength of the first casing wall 111 in the middle region, thereby improving the deformation resistance and impact resistance of the middle region of the first casing wall 111. It also reduces the thickness of the first casing wall 111 in the edge region, thereby reducing the amount of material used and the space occupied in the edge region of the first casing wall 111, increasing the electrolyte capacity within the casing 10, increasing the electrolyte content, and improving the cycle performance of the battery cell 100. Furthermore, by gradually increasing the wall thickness of at least part of the first shell wall 111 from both ends to the middle, the wall thickness of the first shell wall 111 can be gradually varied, thereby reducing stress concentration, lowering the risk of cracking of the first shell wall 111, and improving the service life of the first shell wall 111.

[0032] In some embodiments of this utility model, the first shell wall 111 is the shell wall with the largest area among the side walls of the shell 10. For example, see reference to... Figure 1 and Figure 2 As shown, the casing 10 of the battery cell 100 is a rectangular box shape. The third direction is the thickness direction of the battery cell 100 and is the front-to-back direction. The second direction is the length direction of the battery cell 100 and is the left-to-right direction. The third direction is the height direction of the battery cell 100 and is the up-to-down direction. The shell wall 111, which is arranged opposite to the casing wall 10 in the thickness direction of the battery cell 10, is the first shell wall 111. The area of ​​the first shell wall 111 is the largest among all the shell walls of the casing 10. In the direction from the periphery of the first shell wall 111 toward the center of the first shell wall 111, the thickness of at least part of the first shell wall 111 gradually increases.

[0033] This embodiment strengthens the structural strength of the shell wall with the largest area among the side walls of the shell 10 by making the first shell wall 111 the shell wall with the largest area, thereby improving the overall strength of the shell, enhancing the deformation resistance and impact resistance of the first shell wall 111 with the largest area, reducing the risk of cracking of the first shell wall 111 with the largest area, and extending the service life of the first shell wall 111.

[0034] In some embodiments of this utility model, reference is made to Figure 2 and Figure 3The first shell wall 111 includes a constant thickness region 1111 and a gradient region 1112. The constant thickness region 1111 has a uniform wall thickness everywhere, and the gradient region 1112 surrounds the periphery of the constant thickness region 1111. The thickness of the gradient region 1112 gradually increases in the direction from the periphery of the first shell wall 111 towards the center. The gradient region 1112 may be arranged only in the constant thickness region 1111 in the first direction (e.g., in the first direction). Figure 1 The gradient region 1112 can also be arranged only on both sides of the equal thickness region 1111 in the second direction (e.g., in the left-right direction shown). Figure 2 and Figure 3 On both sides of the vertical direction shown in the figure, the gradient region 1112 can also be arranged on both sides of the equal thickness region 1111 in the first direction and on both sides of the second direction. In this case, the gradient region 1112 extends into a ring along the circumference of the equal thickness region 1111.

[0035] This embodiment, by setting a gradient region 1112 and gradually increasing the thickness of the gradient region 1112 from the periphery to the center of the first shell wall 111, can avoid the problem of local stress concentration caused by abrupt changes in wall thickness, reduce the risk of cracking of the shell 10, and improve the service life of the shell 10. At the same time, by making the first shell wall 111 include a constant thickness region 1111 and a gradient region 1112, the first shell wall 111 can be made thicker in the middle and thinner at the edges. This allows the wall thickness distribution of the first shell wall 111 to match the expansion stress distribution law of strong in the center and weak on the periphery during cell cycling. The thickened constant thickness region 1111 can directly offset the core expansion impact force of the cell, effectively reducing the bulging deformation in the center of the first shell wall 111 and avoiding the risk of short circuit of the battery cell 100 caused by squeezing the internal cell.

[0036] In some embodiments of this utility model, reference is made to Figures 1-3 In the first direction (e.g.) Figure 1 In the left-right direction shown, the ratio of the length of the equal-thickness region 1111 to the length of the first shell wall 111 is 1 / 2 to 2 / 3. For example, the first direction is the length direction of the battery cell 100, and in the length direction of the battery cell 100, the ratio of the length of the equal-thickness region 1111 to the length of the first shell wall 111 can be 0.5, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64 or 0.66. In this embodiment, by making the ratio of the length of the equal thickness region 1111 to the length of the first shell wall 111 1 / 2-2 / 3, the equal thickness region 1111 can accurately match the strong stress distribution in the middle of the battery cell 100 in the first direction when the cell expands. This allows the equal thickness region 1111 to completely cover the area of ​​high stress concentration in the first direction, effectively resisting the bulging deformation of the shell 10. At the same time, it can also reserve enough space for the gradient region 1112 in the first direction, avoiding material redundancy caused by the equal thickness region 1111 being too large, further increasing the electrolyte capacity and improving the cycle performance of the battery cell 100.

[0037] In some embodiments of this utility model, in the second direction (e.g.) Figure 2 and Figure 3 In the vertical direction shown, the ratio of the height L of the equal thickness region 1111 to the height L0 of the first shell wall 111 is 1 / 2 to 2 / 3. For example, in the second direction, which is the height direction of the battery cell 100, the ratio of the height L of the equal thickness region 1111 to the height L0 of the first shell wall 111 can be 0.5, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64, or 0.66. In this embodiment, by setting the ratio of the height L of the equal thickness region 1111 to the height L0 of the first shell wall 111 to 1 / 2-2 / 3, the equal thickness region 1111 can accurately match the strong stress distribution in the middle of the height direction of the battery cell 100 during cell expansion. This allows the equal thickness region 1111 to completely cover the area of ​​strong stress concentration in the second direction, effectively resisting the bulging deformation of the shell 10. At the same time, it can also reserve enough space for the gradient region 1112 in the second direction, reducing material usage, further increasing electrolyte capacity, and improving the cycle performance of the battery cell 100.

[0038] In some embodiments of this utility model, reference is made to Figures 5-10 As shown, the first shell wall 111 is provided with a plurality of reinforcing protrusions 112. For example, the number of reinforcing protrusions 112 can be two, three, five, eight, ten, fifteen, twenty, thirty, forty or more. In this embodiment, by providing a plurality of reinforcing protrusions 112 on the first shell wall 111, the structural strength of the first shell wall 111 can be further improved without significantly increasing the wall thickness of the first shell wall 111, thereby enhancing the impact resistance of the first shell wall 111 and reducing the risk of deformation and cracking of the first shell wall 111. At the same time, by providing reinforcing protrusions 112, the gaps between the plurality of reinforcing protrusions 112 can be filled with electrolyte, thereby increasing the electrolyte content in the shell 10 and improving the charge-discharge cycle performance of the battery cell 100.

[0039] In some examples, the reinforcing protrusion 112 can be a protrusion, a protrusion pillar, or a protrusion hull shape. The reinforcing protrusion 112 can also be a strip shape extending along a straight line and / or a curve. The reinforcing protrusion 112 can extend into a ring shape.

[0040] In some embodiments of this utility model, such as Figure 6 , Figure 8 and Figure 10 As shown, the reinforcing protrusion 112 is provided on the surface of the first shell wall 111 facing inwards towards the shell 10, and the protrusion height d of the reinforcing protrusion 112 is 0.1mm-0.3mm. For example, the reinforcing protrusion 112 is in a third direction (e.g., Figure 6The height d of the protrusion (in the front-rear direction shown) can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, or 0.3mm. In this embodiment, by making the height d of the reinforcing protrusion 112 0.1mm-0.3mm, the structural strength of the first shell wall 111 can be significantly improved without occupying too much internal space of the shell 10, thus balancing the energy density and service life of the battery cell 100.

[0041] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the housing 10 includes a housing body 11 and an end cap 12. The housing body 11 is open on one side in a second direction, and the end cap 12 covers the open side of the housing body 11, thereby facilitating the insertion of battery cells into the housing 10. The first housing wall 111 consists of two housing walls of the housing body 11 arranged opposite each other in a third direction, and a reinforcing protrusion 112 is formed on the housing body 11. The reinforcing protrusion 112 thereby enhances the structural strength of the housing body 11.

[0042] like Figure 4 As shown, in the second direction, the distance between the reinforcing protrusion 112 and the end edge of the shell body 11 facing the end cap 12 is a first distance h, and the ratio of the first distance h to the height H of the first shell wall 111 in the second direction is 0.05-0.15. For example, the ratio of the first distance h to the height H of the first shell wall 111 in the second direction is 0.05, 0.08, 0.1, 0.12, or 0.15. Therefore, without interfering with the end cap 12, the reinforcing protrusion 112 can be positioned close to the connection point between the end cap 12 and the shell body 11, improving the structural strength of the connection point, ensuring the welding reliability of the end cap 12 and the shell body 11, reducing fatigue damage at the welding point, and extending the service life of the shell 10 of the battery cell 100.

[0043] In some examples, the end cap 12 includes a cap body and a connecting flange connected to the periphery of the cap body and extending in the vertical direction. The connecting flange can be arranged on the outer periphery of the shell body 11, or on the side of the shell body 11 facing the receiving cavity of the shell 10. The connecting flange is welded to the shell body 11. For example, when welding the shell body 11 and the end cap 12, the welding head can be set horizontally so as to be arranged perpendicular to the connecting flange or the side wall of the shell body 11 at 90°, and welding can be performed within the overlap length of the connecting flange and the side wall of the shell body 11. In this case, the welding between the end cap 12 and the shell body 11 is a side-view laser welding.

[0044] In other embodiments, the end cap 12 can be plate-shaped, and a positioning groove 113 is formed on the end face of the open end of the shell body 11. The positioning groove 113 extends circumferentially around the shell body 11 in an annular shape, and the side of the positioning groove 113 facing the receiving cavity of the shell 10 is open to communicate with the receiving cavity of the shell 10. At least a portion of the end cap 12 is disposed in the positioning groove 113, and the periphery of the end cap 12 is supported on the bottom wall of the positioning groove 113. Further, the upper surface of the end cap 12 can be flush with the end face of the open end of the shell body 11. The periphery of the end cap 12 is welded to the periphery of the open end of the shell body 11. For example, when welding the shell body 11 and the end cap 12, the welding head can be set vertically so that the welding head is perpendicular to the upper surface of the end cap 12, and the welding position aligned with the welding head is the joint position between the end cap 12 and the shell body 11. In this case, the welding between the end cap 12 and the shell body 11 is vertical laser welding.

[0045] In some embodiments of this utility model, reference is made to Figure 4 As shown, in the direction from the end cap 12 toward the shell body 11, the height of a plurality of reinforcing protrusions 112 located at the end of the shell body 11 near the end cap 12 gradually increases. In this embodiment, by making the plurality of reinforcing protrusions 112 near the end cap 12 of the shell body 11 gradually increase in height along the direction from the end cap 12 toward the shell body 11, the structural strength of the first shell wall 111 can be gradually increased, allowing the structural strength of the first shell 10 to more precisely match the stress distribution characteristics on the first shell wall 111 that increase from the end cap 12 toward the middle of the first shell wall 111. Simultaneously, the lower height of the reinforcing protrusions 112 near the end cap 12 avoids interference between the reinforcing protrusions 112 and the end cap 12, and avoids interference with the welding operation between the end cap 12 and the shell body 11. Furthermore, the gradually increasing height of the reinforcing protrusions 112 allows for smooth stress transfer on the first shell wall 111, reducing the risk of stress concentration.

[0046] In some embodiments of this utility model, reference is made to Figure 4 In the direction from the end cap 12 toward the shell body 11, the ends of a plurality of reinforcing protrusions 112, whose height gradually increases, together define a first inclined surface facing inwards from the end of the shell 10. The angle α between the first inclined surface and the plane containing the first and second directions is 25°-45°. For example, the angle α between the first inclined surface and the plane containing the first and second directions can be 25°, 30°, 35°, 40°, or 45°. This allows the increase in height of the plurality of reinforcing protrusions 112 to be more gradual, thereby reducing stress concentration.

[0047] In some embodiments of this utility model, such as Figure 6 , Figure 8 and Figure 10As shown, the cross-sectional area of ​​the reinforcing protrusion 112 gradually decreases along its protrusion direction. This allows for a larger area at the end of the reinforcing protrusion 112 connected to the first shell wall 111, increasing the connection strength between them and reducing the risk of cracking at the connection point. Furthermore, it allows for a smaller cross-sectional dimension at the end of the reinforcing protrusion 112 furthest from the first shell wall 111, thereby reducing the space occupied by the reinforcing protrusion 112 within the casing 10, increasing the electrolyte capacity, and improving the cycle performance of the battery cell 100.

[0048] In some embodiments of this utility model, such as Figure 6 , Figure 8 and Figure 10 As shown, the circumferential surface of the reinforcing protrusion 112 is aligned with a third direction (e.g., Figure 6 The included angle b between the front and rear directions shown is 30°-40°, and the third direction, the first direction, and the second direction are mutually perpendicular. For example, at least a portion of the outer peripheral surface of the reinforcing protrusion 112 is an inclined surface set relative to the third direction, and the included angle b between the inclined surface and the third direction can be 30°, 32°, 34°, 35°, 36°, 38°, or 40°. Thus, the reinforcing protrusion 112 can not only efficiently decompose the expansion impact force of the battery cell along the third direction into a component force along the peripheral surface and transmit it to the first shell wall 111, avoiding stress concentration at the root of the reinforcing protrusion 112 and reducing the risk of cracking, but also facilitate the molding and processing of the reinforcing protrusion 112, and ensure the structural strength of the reinforcing protrusion 112, avoiding the reinforcing protrusion 112 occupying too much space within the shell 10.

[0049] In some embodiments of this utility model, such as Figure 5 , Figure 7 and Figure 9 As shown, multiple reinforcing protrusions 112 are arrayed on the first shell wall 111. This allows the multiple reinforcing protrusions 112 to be distributed more evenly on the first shell wall 111, thereby improving the overall structural strength of the first shell wall 111.

[0050] In some embodiments of this utility model, such as Figure 5 , Figure 7 and Figure 9 As shown, the cross-section of the reinforcing protrusion 112 perpendicular to the third direction is circular or square, and the third direction, the first direction, and the second direction are all perpendicular to each other. When the cross-section of the reinforcing protrusion 112 is circular, the reinforcing protrusion 112 can evenly distribute stress and avoid stress concentration. When the cross-section of the reinforcing protrusion 112 is square, it can facilitate the processing of the reinforcing protrusion 112 and reduce the processing difficulty.

[0051] In some embodiments of this utility model, such as Figure 7 and Figure 9 As shown, the reinforcing protrusion 112 is along the first direction (e.g.) Figure 7 As shown in the left-right direction, the reinforcement protrusion 112 extends into a long strip shape, and the two ends of the reinforcement protrusion 112 extend to the two ends of the first shell wall 111, respectively. Thus, the reinforcement protrusion 112 can substantially cover the first shell wall 111 in the first direction, thereby effectively dispersing the cell expansion force in the first direction, avoiding stress concentration, and improving the service life of the first shell wall 111.

[0052] The battery cell 100 according to a second aspect embodiment of the present invention includes a housing 10 of the battery cell 100 according to the first aspect embodiment of the present invention. The battery cell 100 also includes a battery cell disposed within the housing 10, which is further filled with an electrolyte. The battery cell can be a wound cell formed by winding a positive electrode, a negative electrode, and a separator, or it can be a blade-type cell formed by stacking a positive electrode, a negative electrode, and a separator.

[0053] According to the battery cell 100 of the present utility model embodiment, by providing the housing 10 of the battery cell 100 of the first aspect embodiment described above, the overall performance of the battery cell 100 is improved.

[0054] A battery device according to a second aspect embodiment of the present invention includes a battery cell 100 according to the second aspect embodiment of the present invention described above. The battery device may include a housing and a plurality of battery cells 100, wherein the plurality of battery cells 100 are arranged sequentially in the housing along the length and / or width direction of the housing. The battery device further includes a thermal management component disposed in the housing for heat exchange with the plurality of battery cells 100.

[0055] According to the battery device of the present invention, by providing the battery cell 100 of the second aspect embodiment described above, the overall performance of the battery device is improved.

[0056] The following will refer to Figures 1-10 The present invention describes a battery cell 100 according to three specific embodiments.

[0057] Example 1, refer to Figures 1-4 The battery cell 100 includes a housing 10 and a battery cell. The housing 10 defines a cavity, and the battery cell is disposed within the cavity of the housing 10. The housing 10 is rectangular in shape, with its height in the vertical direction, its thickness in the front-back direction, and its length in the horizontal direction. The housing 10 includes a main body 11 and an end cap 12. The main body 11 defines a cavity with an open top, and the end cap 12 covers the top of the main body 11 and is welded to the main body 11.

[0058] The shell body 11 includes two first shell walls 111 arranged opposite each other in the front-to-back direction. The first shell wall 111 is rectangular plate-shaped. In the direction from top to bottom, the thickness of the first shell wall 111 gradually increases, then remains constant in the middle region of the first shell wall 111, and then gradually decreases. In the direction from left to right, the thickness of the first shell wall 111 gradually increases, then remains constant in the middle region of the first shell wall 111, and then gradually decreases.

[0059] Furthermore, the minimum wall thickness of the first shell wall 111 is 0.8mm-1mm, the maximum wall thickness of the first shell wall 111 is 0.8mm-1.1mm, the height of the middle section of the first shell wall 111 with constant wall thickness in the vertical direction is 1 / 2-2 / 3 of the total height of the first shell wall 111, and the length of the middle section of the first shell wall 111 with constant wall thickness in the horizontal direction is 1 / 2-2 / 3 of the total length of the first shell wall 111.

[0060] like Figure 5 and Figure 6 As shown, the surface of the first shell wall 111 facing the cavity has multiple reinforcing protrusions 112, which are arranged in multiple rows and columns on the first shell wall 111. The protrusion height d of the reinforcing protrusions 112 is 0.1 mm. In the vertical direction, the ratio of the distance h between the uppermost reinforcing protrusion 112 and the upper edge of the first shell wall 111 to the total height H of the first shell wall 111 is 1 / 10.

[0061] Furthermore, the reinforcing protrusion 112 is formed as a dot-shaped reinforcing protrusion 112 with a circular cross-section. For example, the reinforcing protrusion 112 has a blunted apical cone shape, and adjacent reinforcing protrusions 112 are closely arranged in the left-right and up-down directions. The angle b between the circumferential surface of the reinforcing protrusion 112 and the front-back direction is 30°-40°.

[0062] Example 2, as Figure 7 and Figure 8 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the reinforcing protrusion 112 in Embodiment 1 is a dot-shaped reinforcing protrusion 112, while the reinforcing protrusion 112 in this Embodiment 2 is a block-shaped reinforcing protrusion 112.

[0063] Specifically, such as Figure 7 and Figure 8As shown, the cross-section of the reinforcing protrusion 112 perpendicular to the front-back direction is rectangular. Along the protrusion direction of the reinforcing protrusion 112, the cross-sectional area of ​​the reinforcing protrusion 112 gradually decreases. The bottom surface of the reinforcing protrusion 112 connected to the first shell wall 111 can be a square with a side length of 0.6mm-0.7mm, and the top surface of the reinforcing protrusion 112 away from the first shell wall 111 is a square with a side length of 0.5mm. The protrusion height d of the reinforcing protrusion 112 is 0.1mm. Furthermore, the spacing between adjacent reinforcing protrusions 112 in the vertical and horizontal directions is 0.1mm-0.3mm.

[0064] Example 3, as Figure 9 and Figure 10 As shown, the structure of this embodiment is roughly the same as that of embodiment two, and the same components are referred to by the same reference numerals. The only difference is that the reinforcing protrusion 112 in embodiment two is a block-shaped reinforcing protrusion 112, while the reinforcing protrusion 112 in this embodiment three extends into a long strip along the left and right direction.

[0065] Specifically, such as Figure 9 and Figure 10 As shown, the height d of the reinforcing protrusion 112 is 0.1 mm. The cross-section of the reinforcing protrusion 112 perpendicular to the front-back direction is rectangular. The left and right ends of the reinforcing protrusion 112 extend to the left and right end edges of the first shell wall 111, respectively. The bottom surface of the reinforcing protrusion 112 connected to the first shell wall 111 has a vertical width of 0.6 mm-0.7 mm, and the top surface of the reinforcing protrusion 112 away from the first shell wall 111 has a vertical width of 0.5 mm. The distance between two adjacent reinforcing protrusions 112 in the vertical direction is 0.1 mm.

[0066] According to the battery cell 100 of this utility model embodiment, the wall thickness of a portion of the first shell wall 111 on the large surface of the shell 10 is optimized to a gradual thickness, which can improve the mechanical strength and impact resistance of the first shell wall 111. At the same time, a reinforcing protrusion 112 is provided on the first shell wall 111. The reinforcing protrusion 112 can further improve the mechanical strength and increase the electrolyte content in the battery cell 100, thereby improving the cycle performance of the battery cell 100.

[0067] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model.

[0068] 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 utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0069] In this utility model, unless otherwise explicitly 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, an electrical connection, or a communication 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 utility model according to the specific circumstances.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A casing (10) for a battery cell (100), characterized in that, The housing (10) has a first shell wall (111) in which the thickness of at least a portion of the first shell wall (111) gradually increases in a direction from both ends toward the center along a first direction, and / or, in a direction from both sides toward the center along a second direction, the thickness of at least a portion of the first shell wall (111) gradually increases, wherein the first direction and the second direction are perpendicular.

2. The casing (10) of the battery cell (100) according to claim 1, characterized in that, The first shell wall (111) includes a constant thickness region (1111) and a gradient region (1112). The wall thickness of the constant thickness region (1111) is equal everywhere. The gradient region (1112) surrounds the periphery of the constant thickness region (1111). The thickness of the gradient region (1112) gradually increases in the direction from the periphery of the first shell wall (111) toward the center.

3. The casing (10) of the battery cell (100) according to claim 2, characterized in that, In the first direction, the ratio of the length of the equal thickness region (1111) to the length of the first shell wall (111) is 1 / 2 to 2 / 3; and / or, in the second direction, the ratio of the height of the equal thickness region (1111) to the height of the first shell wall (111) is 1 / 2 to 2 / 3.

4. The casing (10) of the battery cell (100) according to any one of claims 1-3, characterized in that, The first shell wall (111) is provided with a plurality of reinforcing protrusions (112).

5. The casing (10) of the battery cell (100) according to claim 4, characterized in that, The reinforcing protrusion (112) is provided on the side surface of the first shell wall (111) facing the inside of the shell (10), and the protrusion height of the reinforcing protrusion (112) is 0.1mm-0.3mm.

6. The housing (10) of the battery cell (100) according to claim 4, characterized in that, The housing (10) includes a housing body (11) and an end cap (12). The housing body (11) is open on one side in the second direction, and the end cap (12) covers the open side of the housing body (11). The reinforcing protrusion (112) is formed on the housing body (11). In the second direction, the distance between the reinforcing protrusion (112) and the end edge of the shell body (11) facing the end cap (12) is a first distance, and the ratio of the first distance to the height of the first shell wall (111) in the second direction is 0.05-0.

15.

7. The casing (10) of the battery cell (100) according to claim 6, characterized in that, In the direction from the end cap (12) toward the shell body (11), the height of the plurality of reinforcing protrusions (112) provided on one end of the shell body (11) near the end cap (12) gradually increases.

8. The casing (10) of the battery cell (100) according to claim 4, characterized in that, In the protrusion direction of the reinforcing protrusion (112), the cross-sectional area of ​​the reinforcing protrusion (112) gradually decreases.

9. The housing (10) of the battery cell (100) according to claim 8, characterized in that, The angle between the circumferential surface of the reinforcing protrusion (112) and the third direction is 30°-40°, and the third direction is perpendicular to the first direction and the second direction.

10. The casing (10) of the battery cell (100) according to claim 4, characterized in that, The plurality of the reinforcing protrusions (112) are arrayed on the first shell wall (111); or, The reinforcing protrusion (112) has a circular or square cross-section perpendicular to the third direction, and the third direction is perpendicular to both the first and second directions; or, The reinforcing protrusion (112) extends in the first direction into a long strip shape, and the two ends of the reinforcing protrusion (112) extend to the two ends of the first shell wall (111).

11. The casing (10) of the battery cell (100) according to claim 1, characterized in that, The first shell wall (111) is the shell wall with the largest area among the side walls of the shell (10).

12. A battery cell (100), characterized in that, The housing (10) includes the battery cell (100) according to any one of claims 1-11.

13. A battery device, characterized in that, Includes the battery cell (100) according to claim 12.

Images