Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and an electric device, and relates to the technical field of batteries. The battery monomer comprises a shell and an electric core arranged in the shell; the electric core comprises a target end face arranged on one side of the electric core along a first direction; the shell comprises a first bottom wall, which is arranged opposite to the target end face along the first direction; at least two spaced protrusions are arranged between the target end face and the first bottom wall; the projection area of the target end face on the first bottom wall along the first direction is S1 mm 2 , the total projection area of the protrusions on the first bottom wall is S2 mm 2 , and S1 and S2 satisfy 0.16<=S2 / S1<=0.6. The battery monomer can improve the energy density of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery cell, a battery, and an electrical device. Background Technology

[0002] With the rapid development of new energy vehicles, consumer electronics and energy storage, improving the energy density of lithium batteries, as core energy storage devices, has become a core goal for the industry's technological breakthroughs.

[0003] In the prior art, a rounded corner is provided at the transition of the cell corner. When the cell is installed into the casing, the rounded corner at the bottom of the cell is prone to interference with the inner wall of the battery casing, which can cause damage to the cell. Usually, a bottom support plate is set between the cell and the bottom wall of the casing to support and raise the cell.

[0004] However, the base plate will occupy the internal space of the casing, reducing the utilization rate of the internal space and affecting the improvement of battery energy density. Utility Model Content

[0005] This application aims to at least solve one of the technical problems existing in the background art. To this end, this application provides a battery cell, a battery, and an electrical device, and the technical solution provided by this application can improve the energy density of the battery.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A first aspect of this application provides a battery cell, comprising:

[0008] The housing, and the battery cells disposed within the housing;

[0009] The battery cell includes a target end face, which is disposed on one side of the battery cell along a first direction; the housing includes a first bottom wall, which is disposed opposite to the target end face along the first direction.

[0010] At least two spaced protrusions are provided between the target end face and the first bottom wall;

[0011] Along the first direction, the projected area of ​​the target end face on the first bottom wall is S1 mm. 2 The total projected area of ​​the protrusion on the first bottom wall is S2 mm. 2 S1 and S2 satisfy 0.16≤S2 / S1≤0.6.

[0012] A second aspect of this application provides a battery, including the battery cell as described above.

[0013] A third aspect of this application provides an electrical device including a battery as described above.

[0014] The battery cell provided by the above technical solution has at least two spaced protrusions between the target end face of the cell and the first bottom wall of the casing. These protrusions lift and support the cell, preventing interference between the rounded corners at the bottom of the cell and the inner wall of the casing, which could cause damage to the cell. The projected area S1 of the target end face on the first bottom wall and the total projected area S2 of the protrusions on the first bottom wall satisfy 0.16≤S2 / S1≤0.6. This ensures sufficient support strength for the protrusions, preventing cell collapse, effectively avoiding interference between the rounded corners at the bottom of the cell and the inner wall of the casing, preventing wrinkling of the insulating film, cell damage, and electrode material loss, and preventing overcurrent caused by damaged tab connections. It also improves the mass energy density of the battery and provides space for gas emission and electrolyte storage inside the cell.

[0015] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the battery cells, batteries, and electrical devices provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation methods. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A perspective view of the casing, cell, and insulating film of a battery cell provided in an embodiment of this application;

[0018] Figure 2 This is a cross-sectional view of the casing, cell, and insulating film of a battery cell provided in an embodiment of this application after a partial explosion, wherein the protrusion is provided on the second bottom wall of the insulating film;

[0019] Figure 3 A top view of the protrusion of a battery cell provided in an embodiment of this application projected along a first direction onto a first bottom wall;

[0020] Figure 4 This is a perspective view of the housing of a battery cell provided in an embodiment of this application, wherein a protrusion is provided on the first bottom wall of the housing;

[0021] Figure 5 for Figure 4 A cross-sectional view of the housing along the first direction;

[0022] Figure 6 for Figure 5 Assembly diagram of the casing, battery cell, and insulating film;

[0023] Figure 7 A perspective view of the insulating film of a battery cell provided in an embodiment of this application, wherein a protrusion is provided on the second bottom wall of the insulating film;

[0024] Figure 8 for Figure 7 A cross-sectional view of the insulating film along the first direction;

[0025] Figure 9 for Figure 8 Assembly diagram of the insulating film, housing, and battery cell;

[0026] Figure 10 This is an assembly drawing of the casing, cell and insulating film of a battery cell provided in an embodiment of this application, wherein a filler is provided in the raised groove;

[0027] Figure 11 An assembly drawing of the casing, cell, and insulating film of a battery cell provided in an embodiment of this application, wherein the cell is an irregularly shaped cell;

[0028] Figure 12 for Figure 11 Structural diagram of the shell in the middle;

[0029] Figure 13 This is an assembly drawing of the casing, cell, and insulating film of a battery cell provided in an embodiment of this application, wherein an explosion-proof valve is provided on the first bottom wall;

[0030] Figure 14 This is a partial enlarged view of the insulating film of a battery cell provided in an embodiment of this application, wherein a second through hole and a circular protrusion are provided on the second bottom wall;

[0031] Figure 15 This is a partial enlarged view of the insulating film of a battery cell provided in an embodiment of this application, wherein a second through hole and an elongated protrusion are provided on the second bottom wall.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Housing; 11. First bottom wall; 12. First side wall; 13. Pressure relief hole; 14. Explosion-proof valve;

[0034] 20. Battery cell; 21. Target end face; 22. Outer peripheral surface; 23. Extension;

[0035] 30. Protrusion; 31. Groove; 32. Filler; 33. Accommodating space;

[0036] 40. Insulating film; 41. Second bottom wall; 42. Second side wall; 43. First through hole; 44. Second through hole;

[0037] Z, first direction; Y, second direction; X, third direction. Detailed Implementation

[0038] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0039] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0040] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] The following is combined with Figures 1-15 This describes an embodiment of the present application.

[0042] A first aspect of this application provides a battery cell, comprising:

[0043] Housing 10, and battery cell 20 disposed within housing 10;

[0044] The battery cell 20 includes a target end face 21, which is disposed on one side of the battery cell 20 along the first direction Z; the housing 10 includes a first bottom wall 11, which is disposed opposite to the target end face 21 along the first direction Z.

[0045] At least two spaced protrusions 30 are provided between the target end face 21 and the first bottom wall 11;

[0046] Along the first direction Z, the projected area of ​​the target end face 21 on the first bottom wall 11 is S1 mm. 2 The total projected area of ​​the protrusion 30 on the first bottom wall 11 is S2 mm.2 S1 and S2 satisfy 0.16≤S2 / S1≤0.6.

[0047] It should be noted that, please refer to Figure 1 As shown, with the battery cell as a reference, the first direction Z refers to the height direction of the battery cell; the second direction Y refers to the length direction of the battery cell; and the third direction X refers to the width direction of the battery cell. The first direction Z, the second direction Y, and the third direction X intersect each other. The casing 10 has an opening along one side of the first direction Z, and the battery cell 20 enters the casing 10 along the first direction Z through the opening. For better illustration and understanding, Figure 2 The diagram shows a cross-sectional view of the battery cell housing 10, cell 20, and insulating film 40 after a partial explosion, wherein a protrusion 30 is provided on the second bottom wall 41 of the insulating film 40.

[0048] In this embodiment of the application, please refer to Figure 2 As shown, the battery cell 20 has a target end face 21 and an outer peripheral face 22; the insulating film 40 includes a second bottom wall 41 and a second side wall 42, the second side wall 42 surrounds the edge of the second bottom wall 41, the second bottom wall 41 covers the target end face 21, and the second side wall 42 covers the outer peripheral face 22; the housing 10 includes a first bottom wall 11 and a first side wall 12, the first side wall 12 surrounds the edge of the first bottom wall 11, and the first side wall 12 surrounds the second side wall 42; the first bottom wall 11 and the second bottom wall 41 are arranged opposite each other along the first direction Z; the protrusion 30 can be provided on the first bottom wall 11 or on the second bottom wall 41.

[0049] In this embodiment of the application, please refer to Figure 3 As shown, Figure 3 A top view of the protrusion 30 projected onto the first bottom wall 11 along the first direction Z is shown; along the first direction Z, the projected area of ​​the target end face 21 on the first bottom wall 11 is S1 mm. 2 The total projected area of ​​the protrusion 30 on the first bottom wall 11 is S2 mm. 2 If the value of S2 / S1 is too small, the supporting strength of the protrusion 30 may be insufficient, and the cell 20 may collapse, causing interference between the insulating film on the outside of the cell 20 and the shell 10, wrinkling of the insulating film, or contact between the bottom of the cell 20 and the shell 10, resulting in electrode material falling off. The collapse of the cell 20 may also cause the tabs to be torn, resulting in damage to the tab connection and affecting the overcurrent. Therefore, S2 / S1 must meet the requirement of S2 / S1≥0.16. If the value of S2 / S1 is too large, on the one hand, it may reduce the mass energy density of the battery, and on the other hand, it may cause the space between the first bottom wall 11 and the insulating film to be too small. This may not only cause the gas inside the cell 20 to be unable to be effectively discharged, but also affect the amount of electrolyte stored. Therefore, S2 / S1 must also meet the requirement of S2 / S1≤0.6.

[0050] The battery cell provided in this application embodiment has at least two spaced protrusions 30 between the target end face 21 of the cell 20 and the first bottom wall 11 of the casing 10. The protrusions 30 lift and support the cell 20, preventing interference between the rounded corners of the cell 20 and the inner wall of the casing 10, which would cause damage to the cell 20. The projected area S1 of the target end face 21 on the first bottom wall 11 and the total projected area S2 of the protrusions 30 on the first bottom wall 11 satisfy 0.16≤S2 / S1≤0.6. This ensures sufficient support strength for the protrusions 30, preventing the cell 20 from collapsing, effectively preventing interference between the rounded corners of the cell 20 and the inner wall of the casing 10, preventing wrinkling of the insulating film, damage to the cell 20, and loss of electrode material, and preventing overcurrent caused by damaged tab connections. On the other hand, it can improve the mass energy density of the battery and provide space for gas emission and electrolyte storage inside the cell 20.

[0051] In one possible implementation, please see Figure 4 , Figure 5 and Figure 6 As shown, along the first direction Z, the protrusion 30 protrudes from the first bottom wall 11 toward the target end face 21.

[0052] In this embodiment, by providing multiple spaced protrusions 30 protruding from the first bottom wall 11 of the housing 10 toward the target end face 21, the protrusions 30 lift and support the battery cell 20, avoiding interference between the rounded corners at the bottom of the battery cell 20 and the inner wall of the housing 10, which would cause damage to the battery cell 20. By replacing the entire bottom support plate with multiple spaced protrusions 30, the space occupied inside the housing 10 can be reduced, providing space for gas emission and electrolyte storage inside the battery cell 20, and also improving the mass energy density of the battery.

[0053] Furthermore, the protrusion 30 and the first bottom wall 11 can be an integrally formed structure.

[0054] In one possible implementation, please see Figure 1 and Figure 2 As shown, the battery cell also includes an insulating film 40, which includes a second bottom wall 41 and a second side wall 42; the second side wall 42 covers the outer peripheral surface 22, and the second bottom wall 41 covers the target end face 21.

[0055] Please see Figure 7 , Figure 8 and Figure 9 As shown, along the first direction Z, the protrusion 30 protrudes from the second bottom wall 41 toward the first bottom wall 11.

[0056] In this embodiment, by providing multiple spaced protrusions 30 protruding from the second bottom wall 41 of the insulating film 40 toward the first bottom wall 11, the protrusions 30 lift and support the cell 20, avoiding interference between the rounded corners of the bottom of the cell 20 and the inner wall of the housing 10, which would cause damage to the cell 20. By replacing the entire bottom support plate with multiple spaced protrusions 30, the space occupied inside the housing 10 can be reduced, providing space for gas emission and electrolyte storage inside the cell 20, and also improving the mass energy density of the battery. Furthermore, compared to setting the protrusion 30 on the first bottom wall 11 of the housing 10, in this embodiment, by setting the protrusion 30 on the second bottom wall 41 of the insulating film 40, the structural complexity of the housing 10 can be reduced, the process compatibility can be improved, and the requirements of lightweight, high strength and low cost can be met. At the same time, the protrusion 30 on the insulating film 40 can be flexibly formed by molding or injection molding without changing the housing structure, which significantly reduces the manufacturing cost. On the other hand, the insulating film 40 has a certain degree of elasticity, and the second bottom wall 41 is provided with multiple spaced protrusions 30, which can realize multi-point flexible support for the battery cell 20 and effectively absorb the volume expansion of the battery cell 20 during charging and discharging.

[0057] Furthermore, the protrusion 30 and the insulating film 40 are integrally formed.

[0058] In one possible implementation, please see Figure 10 As shown, a groove 31 is formed in the side of the protrusion 30 away from the first bottom wall 11.

[0059] In this embodiment of the application, a groove 31 is formed by recessing the protrusion 30 on the side away from the first bottom wall 11. An accommodating space can be formed in the groove 31, and the accommodating space can store electrolyte.

[0060] In one possible implementation, please see Figure 10 As shown, a filler 32 is provided in the groove 31. The hardness of the filler 32 is greater than that of the insulating film 40, and / or the filler 32 has a porous structure.

[0061] In this embodiment, by providing a filler 32 in the groove 31, the hardness of the filler 32 is greater than that of the insulating film 40, thereby enhancing the mechanical support and deformation resistance of the protrusion 30 and ensuring the effective support strength of the protrusion 30. The filler 32 is set as a porous structure, which can absorb the electrolyte in the battery and facilitate subsequent electrolyte replenishment during battery use.

[0062] In one possible implementation, please see Figure 3 As shown, along the arrangement direction of the protrusions 30, the distance between the protrusions 30 and the edge of the first bottom wall 11 is W1 mm, and W1 satisfies W1≤15.

[0063] In this embodiment, the arrangement direction of the protrusions 30 includes the second direction Y and the third direction X. Multiple protrusions 30 are arranged at intervals along the second direction Y and the third direction X. The distance W1 between the protrusions 30 and the edge of the first bottom wall 11 is optimized by satisfying W1≤15, thereby effectively supporting the battery cell 20 and preventing damage to the battery cell 20 or the insulating film 40 due to local stress concentration.

[0064] In one possible implementation, please see Figure 11 and Figure 12 As shown, a receiving space 33 is formed between two adjacent protrusions 30; the battery cell 20 has an extension 23 that protrudes toward the receiving space 33 and is housed within the receiving space 33.

[0065] In this embodiment, the battery cell 20 is an irregularly shaped battery cell, and the extension 23 of the battery cell 20 is disposed between two adjacent protrusions 30, thereby improving the space utilization rate inside the casing 10 and increasing the volumetric energy density of the battery.

[0066] In one possible implementation, please see Figure 3 As shown, the distance between two adjacent protrusions 30 is W2 mm, and W2 satisfies 2 ≤ W2 ≤ 30.

[0067] In this embodiment, if the distance between two adjacent protrusions 30 is too large, the supporting strength of the protrusions 30 may be insufficient, and the cell 20 may collapse, causing interference between the insulating film and the shell 10 on the outside of the cell 20, wrinkling of the insulating film, or contact between the bottom of the cell 20 and the shell 10, resulting in electrode material falling off. The collapse of the cell 20 may also cause the tabs to be torn, resulting in damage to the tab connection and affecting the overcurrent. Therefore, W2 needs to satisfy W2≤30. If the distance between two adjacent protrusions 30 is too small, the electrolyte channel between the two adjacent protrusions 30 may be too narrow, increasing the wetting resistance. Moreover, in the case of thermal runaway, the gap between two adjacent protrusions 30 can serve as a directional pressure relief path. If the distance between two adjacent protrusions 30 is too small, the gas ejection speed of the battery thermal runaway may be reduced, resulting in a decrease in pressure relief efficiency. Therefore, W2 also needs to satisfy W2≥2.

[0068] By satisfying 2≤W2≤30, W2 can ensure the support strength of the protrusion 30, prevent the cell 20 from collapsing and the insulating film from wrinkling, and prevent the electrode sheet from falling off and the electrode tab connection from being damaged. On the other hand, it can reduce the wetting resistance, optimize the electrolyte wetting, and improve the pressure relief efficiency.

[0069] In one possible implementation, please see Figure 5 and Figure 8As shown, the inner surface of the first bottom wall 11 and the inner surface of the first side wall 12 are connected by a rounded transition, and the radius of the rounded corner is R mm; along the first direction Z, the height of the protrusion 30 is H mm, and H satisfies 0.2R≤H≤2R.

[0070] Along the first direction Z, the height of the protrusion 30 can be understood as the height by which the protrusion 30 lifts the battery cell 20.

[0071] In some embodiments, the value of H can be between 0.2R and 2R. For example, H can be 0.2R, 0.5R, R, 1.5R, 1.8R, or 2R.

[0072] In this embodiment, H can effectively lift and support the battery cell 20 by satisfying 0.2R≤H≤2R, avoiding interference between the rounded corners at the bottom of the battery cell 20 and the inner wall of the housing 10, which would cause damage to the battery cell 20, thus making the battery cell 20 have high reliability.

[0073] In one possible implementation, H satisfies 0.5R≤H≤R.

[0074] In this embodiment, H further satisfies 0.5R≤H≤R, which can effectively lift and support the cell 20, avoiding interference between the rounded corners at the bottom of the cell 20 and the inner wall of the casing 10, thus preventing damage to the cell 20. On the other hand, it can ensure that the cell 20 releases gas during thermal runaway, ensuring pressure relief efficiency. Furthermore, it can avoid excessively raising the cell 20, which would affect the volumetric energy density of the battery.

[0075] In one possible implementation, the range of R is 1 ≤ R ≤ 3;

[0076] And / or, the value of H is in the range of 0.5 ≤ H ≤ 3.

[0077] In this embodiment, R and H further satisfy 1≤R≤3 and / or 0.5≤H≤3, thereby enabling the protrusion 30 to effectively lift and support the cell 20, avoiding interference between the rounded corners at the bottom of the cell 20 and the inner wall of the casing 10, which would cause damage to the cell 20, and at the same time avoiding excessive lifting of the cell 20 which would affect the volumetric energy density of the battery.

[0078] In one possible implementation, please see Figure 13 As shown, a pressure relief hole 13 is provided on the first bottom wall 11. Projected along the first direction Z, the pressure relief hole 13 is located between two adjacent protrusions 30; an explosion-proof valve 14 is provided on the first bottom wall 11, and the explosion-proof valve 14 is covered at the pressure relief hole 13.

[0079] The second bottom wall 41 is also provided with a first through hole 43, which is connected to the pressure relief hole 13.

[0080] In this embodiment, by providing a first through hole 43 on the second bottom wall 41 that communicates with the pressure relief hole 13, it is convenient to discharge the gas inside the battery cell 20 through the first through hole 43 and the explosion-proof valve 14.

[0081] Furthermore, the first through hole 43 and the pressure relief hole 13 are arranged opposite each other along the first direction Z.

[0082] In one possible implementation, S1 and S2 satisfy 0.3≤S2 / S1≤0.5.

[0083] In this embodiment, since an explosion-proof valve 14 is provided on the first bottom wall 11, the value of S2 / S1 needs to further satisfy 0.3≤S2 / S1≤0.5. On the one hand, the value of S2 / S1 cannot be too small, otherwise it will not be able to ensure sufficient support strength of the protrusion 30, causing the cell 20 to collapse, resulting in a reduction in the gap between two adjacent protrusions 30, narrowing the pressure relief path, and increasing the pressure relief resistance. Therefore, S2 / S1 needs to further satisfy S2 / S1≥0.3. On the other hand, the value of S2 / S1 cannot be too large, otherwise it will easily lead to a reduction in the gap between two adjacent protrusions 30, narrowing the pressure relief path and increasing the pressure relief resistance. Therefore, S2 / S1 needs to further satisfy S2 / S1≤0.5.

[0084] In one possible implementation, please see Figure 14 and Figure 15 As shown, the insulating film 40 is also provided with a second through hole 44, which facilitates the electrolyte to wet the battery cell 20 through the second through hole 44 and improves the wetting effect of the electrolyte.

[0085] Furthermore, along the first direction Z, the projection of the second through hole 44 on the first bottom wall 11 does not overlap with the projection of the protrusion 30 on the first bottom wall 11.

[0086] In one possible implementation, the value range of S1 is 1170≤S1≤25500, and the value range of S2 is 195≤S2≤12750.

[0087] In this embodiment, S1 and S2 satisfy 1170≤S1≤25500 and 195≤S2≤12750 respectively. This not only ensures sufficient support strength for the protrusion 30 to prevent the cell 20 from collapsing, but also ensures a sufficiently wide pressure relief path when an explosion-proof valve 14 is provided on the first bottom wall 11, reducing pressure relief resistance and enabling rapid venting in case of thermal runaway.

[0088] In one possible implementation, W2 satisfies 10≤W2≤20, which not only ensures that the supporting effect of the protrusion 30 is more stable, but also facilitates the rapid discharge of thermal runaway gas from the battery, thereby improving the pressure relief efficiency.

[0089] In one possible implementation, the protrusion 30 can be a circular protrusion, a long strip protrusion, or an elliptical protrusion. For example, the protrusion 30 can be entirely circular, long strip, or elliptical, or it can be partially circular and partially long strip or elliptical.

[0090] Please see Figure 14 As shown, the protrusion 30 can be entirely circular, and multiple circular protrusions are evenly spaced along the second direction Y and the third direction X, thereby optimizing the stress distribution.

[0091] Please see Figure 15 As shown, the protrusion 30 can be partly circular and partly elongated, with the elongated protrusion occupying the majority of the area. This can improve the energy density of the battery while also enhancing the support reliability of the protrusion 30.

[0092] In this embodiment, the shape of the protrusion 30 can be diverse, which can reduce the difficulty of processing the protrusion 30 and improve the manufacturing efficiency of the battery.

[0093] In one possible implementation, please see Figure 6 and Figure 9 As shown, the number of battery cells 20 is at least two.

[0094] In this embodiment, the battery cell adopts a multi-cell design, which can reduce the waste space occupation, improve the battery energy density, increase the battery capacity, and meet the high energy density requirements of the scenario.

[0095] A second aspect of this application also provides a battery, including the battery cell as described above.

[0096] Given that the battery in this embodiment includes the battery cell described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery cell will not be described in detail here.

[0097] A third aspect of this application also provides an electrical device, including the battery as described above.

[0098] Among them, electrical equipment can include vehicles, energy storage devices, consumer electronics products, aerospace equipment, etc.

[0099] Given that the electrical equipment in this embodiment includes the battery cell or battery described in any of the above embodiments, the structure and beneficial effects of the electrical equipment including the battery cell or battery will not be described in detail here.

[0100] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0101] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: A housing (10), and a battery cell (20) disposed within the housing (10); The battery cell (20) includes a target end face (21), which is disposed on one side of the battery cell (20) along a first direction (Z); the housing (10) includes a first bottom wall (11), which is disposed opposite to the target end face (21) along the first direction (Z); At least two spaced protrusions (30) are provided between the target end face (21) and the first bottom wall (11); Along the first direction (Z), the projected area of ​​the target end face (21) on the first bottom wall (11) is S1mm. 2 The total projected area of ​​the protrusion (30) on the first bottom wall (11) is S2mm. 2 S1 and S2 satisfy 0.16≤S2 / S1≤0.

6.

2. The battery cell according to claim 1, characterized in that, Along the first direction (Z), the protrusion (30) protrudes from the first bottom wall (11) toward the target end face (21).

3. The battery cell according to claim 1, characterized in that, The battery cell also includes an insulating film (40), the insulating film (40) including a second bottom wall (41), the second bottom wall (41) covering the target end face (21); Along the first direction (Z), the protrusion (30) is provided to protrude from the second bottom wall (41) toward the first bottom wall (11).

4. The battery cell according to claim 3, characterized in that, The protrusion (30) has a recess (31) on the side away from the first bottom wall (11).

5. The battery cell according to claim 4, characterized in that, A filler (32) is provided in the groove (31), the hardness of the filler (32) is greater than the hardness of the insulating film (40), and / or the filler (32) is a porous structure.

6. The battery cell according to any one of claims 1-3, characterized in that, Along the arrangement direction of the protrusions (30), the distance between the protrusions (30) and the edge of the first bottom wall (11) is W1 mm, where W1 satisfies W1 ≤ 15.

7. The battery cell according to any one of claims 1-3, characterized in that, A receiving space (33) is formed between two adjacent protrusions (30); the battery cell (20) has an extension (23) protruding toward the receiving space (33), the extension (23) being built into the receiving space (33).

8. The battery cell according to any one of claims 1-3, characterized in that, The distance between two adjacent protrusions (30) is W2 mm, where W2 satisfies 2 ≤ W2 ≤ 30.

9. The battery cell according to any one of claims 1-3, characterized in that, The housing (10) further includes a first sidewall (12) which surrounds the edge of the first bottom wall (11); The inner surface of the first bottom wall (11) and the inner surface of the first side wall (12) are connected by a rounded corner, the radius of which is R mm; the height of the protrusion (30) is H mm, where H satisfies 0.2R≤H≤2R.

10. The battery cell according to claim 9, characterized in that, H satisfies 0.5R≤H≤R.

11. The battery cell according to claim 9, characterized in that, The range of values ​​for R is 1 ≤ R ≤ 3; And / or, the value of H is in the range of 0.5 ≤ H ≤ 3.

12. The battery cell according to any one of claims 3-5, characterized in that, A pressure relief hole (13) is provided on the first bottom wall (11). When projected along the first direction (Z), the pressure relief hole (13) is located between two adjacent protrusions (30). An explosion-proof valve (14) is provided on the first bottom wall (11), and the explosion-proof valve (14) covers the pressure relief hole (13). The second bottom wall (41) is also provided with a first through hole (43), which is connected to the pressure relief hole (13).

13. The battery cell according to claim 12, characterized in that, S1 and S2 satisfy 0.3≤S2 / S1≤0.

5.

14. The battery cell according to any one of claims 3-5, characterized in that, The insulating film (40) is also provided with a second through hole (44).

15. The battery cell according to claim 14, characterized in that, The range of values ​​for S1 is 1170≤S1≤25500, and the range of values ​​for S2 is 195≤S2≤12750.

16. The battery cell according to claim 8, characterized in that, W2 satisfies 10≤W2≤20.

17. The battery cell according to any one of claims 1-3, characterized in that, The protrusion (30) is a circular protrusion, a long strip protrusion, or an elliptical protrusion.

18. The battery cell according to any one of claims 1-3, characterized in that, The number of the battery cells (20) is at least two.

19. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 18 above.

20. An electrical appliance, characterized in that, Includes the battery as described in claim 19 above.

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