Battery and electric device

Abstract

The present application provides a battery and an electric device. The present application solves the problems in the prior art of low battery capacity and easily loosened tab connection. The battery in embodiments of the present application comprises a battery cell and a protective plate. One end of the battery cell in a first direction of the battery is provided with an accommodating portion and a protruding portion; the protective plate is at least partially accommodated in the accommodating portion; and one side of the protective plate is provided with accommodating portions, and tabs of the battery cell are partially arranged in the accommodating portions. Therefore, the battery in the embodiments of the present application has the advantages of high battery density and high electrical connection reliability.

Description

Batteries and electrical equipment Technical Field

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

[0002] To improve battery safety, extend its lifespan, and enhance its reliability, a protection board is installed at the end of the battery cell to monitor its status in real time. However, due to the limited space at the end of the cell, the protection board protruding from the cell occupies some battery space, leading to a reduction in battery capacity. Summary of the Invention

[0003] In view of this, embodiments of this application provide a battery and an electrical device, which solves the problem in the prior art where the protection board is stacked high due to the tabs located below the protection board, thus affecting the space utilization of the battery, by accommodating at least a portion of the protection board within the receiving portion.

[0004] This application provides a battery. The battery includes a cell and a protection board.

[0005] The battery cell has a receiving portion and a protrusion at one end in a first direction of the battery; at least a portion of the protection plate is housed in the receiving portion, and one side of the protection plate has a groove, and a portion of the battery cell's tab is disposed in the groove.

[0006] The battery of this application embodiment avoids the problem of excessive space occupied by the installation of the protection board by providing a receiving portion for accommodating the protection board at one end of the battery cell along the first direction of the battery. By placing the protection board in the receiving portion formed by the battery cell itself, the utilization rate of the space at one end (head) of the battery cell is optimized. A larger volume battery cell can be accommodated without increasing the overall size of the battery, thus realizing the effective utilization of the overall battery space and improving the energy storage capacity and battery density of the entire system.

[0007] Meanwhile, the recessed grooves on the protection board prevent it from shifting upwards due to the tabs, thus avoiding the protection board protruding beyond the cell and affecting space utilization. This further improves the overall system's energy storage capacity and battery density.

[0008] Therefore, the battery of this application embodiment has the advantage of increasing battery density.

[0009] In some embodiments, the battery cell has a top surface and a side surface, the top surface has the receiving portion and the protrusion, the side surface is located at one end of the battery cell along a second direction, the protection plate includes a protection plate body and a flexible circuit board disposed on the protection plate body, the protection plate body is disposed in the receiving portion, and the groove is provided on the side of the protection plate body opposite to the side surface of the battery cell, the second direction is perpendicular to the first direction.

[0010] In some embodiments, the tab of the battery cell protrudes from the receiving portion outside the bare battery cell, and the protective plate body has a conductive sheet on the side adjacent to the groove, the conductive sheet being opposite to one end of the battery cell, a portion of the tab being bent and placed in the groove, and the portion of the tab extending out of the groove being connected to the protective plate body through the conductive sheet.

[0011] In some embodiments, the flexible circuit board is disposed close to the protrusion, and the width of the flexible circuit board is less than 1 / 2 the width of the protective plate body.

[0012] In other embodiments, in the third direction, the flexible circuit board is disposed at the end of the protective plate body away from the protrusion, and the corner of the battery cell near the flexible circuit board is chamfered.

[0013] In some embodiments, the battery cell includes a housing and a bare battery cell. The housing covers the bare battery cell and has a sealing structure at one end. At the one end of the bare battery cell, the bare battery cell protrudes from one side relative to the other side in a third direction to form the receiving portion and the protrusion. The area of ​​the sealing structure corresponding to the protrusion is bent toward the bare battery cell to form a folded top sealing portion. The third direction is perpendicular to the first direction.

[0014] In some embodiments, the area of ​​the edge sealing structure corresponding to the receiving portion extends along the first direction to form an unfolded top.

[0015] In some embodiments, the unfolded top is positioned below the folded top cover, and the projection of the connecting edge between the folded top cover and the unfolded top in a second direction is one of an oblique line, a right angle, and a curve, wherein the second direction is perpendicular to each of the first direction and the third direction.

[0016] In some embodiments, the transition surface between the protrusion and the receiving portion is one of an inclined surface, a straight tangent surface, and a curved surface.

[0017] In other embodiments, a recess lower than the receiving portion is provided between the protrusion and the receiving portion.

[0018] In some embodiments, the protrusion and the receiving portion are inclined to form the inclined surface, and the protective plate has a mating surface on the side opposite to the inclined surface that is in the same direction as the inclination of the inclined surface.

[0019] In some embodiments, the transition surface between the protrusion and the receiving portion is a right-angled surface, and the side of the protective plate opposite to the right-angled surface is a straight surface adapted to the right-angled surface.

[0020] In some embodiments, the protrusion has a first chamfer at the corner on the third side away from the receiving portion.

[0021] In some embodiments, the corner of the battery cell forming the receiving portion and located away from the protrusion has a second chamfer.

[0022] In some embodiments, the corner of the top sealing portion corresponding to the first chamfer of the bare cell has a sealing edge chamfer, and the lower edge of the sealing edge chamfer is flush with or higher than the upper end surface of the protrusion.

[0023] In some embodiments, the upper edge of the unfolded top is lower than or equal to the upper end face of the protrusion.

[0024] In some embodiments, the distance between the lower edge of the edge-sealing chamfer and the upper end face of the protrusion is X1, where X1 is less than 0.3 mm.

[0025] In some embodiments, the distance between the upper edge of the unfolded top and the upper end face of the protrusion is X2, where X2 is less than 0.3 mm.

[0026] In some embodiments, the length of the receiving portion in the third direction is B, and the width of the protective plate is W, wherein B>L.

[0027] In some embodiments, in the first direction, the width of the receiving portion is C, and the width of the protective plate is W, wherein C > W.

[0028] In some embodiments, in the second direction, the depth of the receiving portion is D, the thickness of the protective plate is H, wherein D>H, and the protective plate is disposed in the receiving portion at an end away from the unfolded top, and the second direction is perpendicular to either the first direction or the third direction.

[0029] In some embodiments, along a third direction, the minimum distance between the protective plate and the protrusion is a1. If the protective plate is a single flexible circuit board, a1 is 0mm to 2mm; if the protective plate is a double flexible circuit board, a1 is 3mm to 6mm.

[0030] In some embodiments, on the same side of the third direction, the distance between the protective plate at the end away from the protrusion and the side of the battery cell is a2, where a2 is 3mm to 6mm.

[0031] In some embodiments, in the first direction, the distance between the upper end face of the protective plate and the upper end face of the protrusion is b1, where b1 is 0 to 0.5 mm.

[0032] In some embodiments, in the first direction, the distance between the lower edge of the protective plate and the inner wall surface of the receiving portion is b2, where b2 is 0 to 1 mm.

[0033] In some embodiments, the battery further includes a buffer layer disposed between the edge sealing structure and the protective plate.

[0034] In some embodiments, the battery further includes an adhesive layer disposed between the edge sealing structure and the protective plate.

[0035] In some embodiments, the battery further includes an insulating seal layer, the insulating seal layer and the sealing structure forming a protective cavity with the area corresponding to the receiving portion, a portion of the protective plate being disposed within the protective cavity, and the insulating seal layer being an adhesive layer or an adhesive paper seal layer.

[0036] In some embodiments, the protection plate is electrically connected to the battery cell, the receiving portion is disposed near one of the corners of the battery along a third direction, the protrusion is disposed near another corner of the battery along a third direction, and the second direction is perpendicular to the first direction.

[0037] In some embodiments, the folded top cover extends in a third direction to the area corresponding to the transition surface between the protrusion and the groove to form a limiting edge. The limiting edge, the inclined surface, and the unfolded top cover form a limiting cavity, and the side of the protective plate opposite to the inclined surface is placed in the limiting cavity.

[0038] The electrical device in this application includes the battery according to any one of the above-described embodiments. Attached Figure Description

[0039] Figure 1 is a perspective view of a battery provided in one embodiment of this application.

[0040] Figure 2 is an exploded view of a battery provided in one embodiment of this application.

[0041] Figure 3 is a front view of a battery provided in one embodiment of this application.

[0042] Figure 4 is a side view of a battery provided in one embodiment of this application.

[0043] Figure 5 is a schematic diagram of the structure of bare battery cell and housing provided in an embodiment of this application, wherein the edge sealing structure is before bending.

[0044] Figure 6 is a schematic diagram of the structure of bare battery cell and housing provided in an embodiment of this application, wherein the edge sealing structure is bent.

[0045] Figure 7 is a schematic diagram of the structure of bare battery cell and housing provided in an embodiment of this application, wherein the edge sealing structure and the tab are bent.

[0046] Figure 8 is a schematic diagram of the structure of a protection plate provided in an embodiment of this application.

[0047] Figure 9 is a perspective view of the bare battery cell and housing after assembly according to an embodiment of this application.

[0048] Figure 10 is a schematic diagram showing the dimensions of the head of the bare battery cell and the body of the protection board according to an embodiment of this application.

[0049] Figure 11 is a perspective view of a structure in which bare battery cell, protection board and housing are provided according to an embodiment of this application.

[0050] Figure 12 is a schematic diagram from the front view of a structure for providing a bare battery cell, protection board, and housing according to an embodiment of this application.

[0051] Figure 13 is a cross-sectional view of the housing, protective plate, and electrode tab connection positions according to another embodiment of this application.

[0052] Figure 14 is a schematic diagram of the area where a protective plate fabric is provided according to an embodiment of this application.

[0053] Figure 15 is a perspective view of a battery provided according to another embodiment of this application.

[0054] Figure 16 is a three-dimensional exploded view of a battery provided in another embodiment of this application.

[0055] Figure 17 is a front exploded view of a battery provided in another embodiment of this application.

[0056] Figure 18 is a schematic diagram of different recessed structures in a battery provided in some embodiments of this application.

[0057] Figure 19 is a comparison diagram of the installation of the protection board and the bare battery cell and housing before and after installation, according to another embodiment of this application.

[0058] Figure 20 is a schematic diagram of the battery assembly steps provided in an embodiment of this application.

[0059] Figure 21 is a schematic diagram of the structure of a protective plate provided in an embodiment of this application.

[0060] 22 is a schematic diagram of the structure of a battery according to another embodiment of this application.

[0061] Figure 23 is an enlarged view of the top sealing structure of a battery according to another embodiment of this application.

[0062] Figure 24 is a schematic diagram of the structure of a housing and a bare battery cell provided according to another embodiment of this application.

[0063] Figure 25 is a schematic diagram of the structure of a protective plate, a housing and a bare battery cell provided in another embodiment of this application.

[0064] Figure 26 is a comparison of the bare battery cell and housing before and after bending according to another embodiment of this application, wherein the protrusion and the receiving part are rounded.

[0065] Figure 27 is a comparison of the bare battery cell and housing before and after bending according to another embodiment of this application, wherein the protrusion and the receiving part are inclined to transition.

[0066] Figure 28 is a comparison of the bare battery cell and housing before and after bending in one embodiment of this application, wherein the protrusion and the receiving part are transitioned at a right angle.

[0067] Figure 29 is a schematic diagram of the structure of a protective plate, a bare battery cell and a housing in one embodiment of the present application, wherein the protrusion and the receiving portion are transitioned at a right angle.

[0068] Figure 30 is a schematic diagram of the battery assembly steps provided in an embodiment of this application.

[0069] Reference numerals: Battery 100; 1. Cell; 11. Bare cell; 111. Protrusion; 1111. First chamfer; 1112. Transition surface; 112. Receiving part; 1121. Second chamfer; 113. Recess; 12. Shell; 121. Folded top seal; 1211. Edge chamfer; 1212. Connecting edge; 122. Unfolded top; 13. Tab; 2. Protection board; 21. Protection board body; 211. Groove; 22. Flexible circuit board; 221. Main body; 222. U-shaped hook; 23. Conductive sheet; 3. Protection board cavity; 4. Buffer layer; 5. Adhesive layer; 6. Insulating seal; 61. Head adhesive layer; 62. Top sealing adhesive layer; 10. Limiting cavity; Limiting edge 213. Detailed Implementation

[0070] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0071] For ease of description, the first direction is defined as the Y direction in the figure, which is the length direction of the battery; the second direction is defined as the Z direction in the figure, which is the thickness direction of the battery; and the third direction is defined as the X direction in the figure, which is the width direction of the battery.

[0072] Referring to Figures 1 to 30, the battery 100 and electrical device provided in the embodiments of this application will be described by way of example.

[0073] The battery 100 in this embodiment includes a battery cell 1 and a protection board 2.

[0074] The cell 1 has a receiving portion 112 and a protrusion 111 at one end (upper end) of the battery 100 in a first direction (e.g., the up-down direction shown in FIG5); at least a portion of the protection plate 2 is housed in the receiving portion 112, and one side of the protection plate 2 has a receiving portion 211, and a portion of the tab 13 of the cell 1 is disposed in the receiving portion 211.

[0075] The battery 100 of this application embodiment avoids the problem of excessive space occupied by the installation of the protection plate 2 by providing a receiving portion 112 for accommodating the protection plate 2 at one end of the cell 1 along the first direction of the battery 100. By placing the protection plate 2 in the receiving portion 112 formed by the cell 1 itself, the utilization rate of the space at one end (head) of the cell 1 is optimized. A larger volume cell 1 can be accommodated without increasing the overall size of the battery 100, thus realizing the effective utilization of the overall space of the battery 100 and improving the energy storage capacity of the entire battery system and the energy density of the battery 100.

[0076] Meanwhile, the length and height of the protrusion 111 of the bare cell 11 can be flexibly adjusted according to the length and width of the protection board 2 and the size of the protection board 2 can be modified. The length and height of the protrusion 111 will also change accordingly, overcoming the problem that once the protection board 2 in the traditional battery 100 is modified, the head of the battery 100 will either have extra space or the size of the electrical equipment will increase.

[0077] In addition, the groove 211 of the protection plate 2 can prevent the protection plate 2 from shifting upwards due to the tab 13, thus avoiding the protection plate 2 protruding outside the cell 1 and affecting space utilization. This further improves the energy storage capacity of the entire system and the energy density of the battery 100.

[0078] In addition, a groove 211 is provided on one side of the protection plate 2, and a part of the tab 13 is placed in the groove 211. The groove 211 positions the tab 13 to ensure that the tab 13 of the battery 100 is precisely aligned with the solder pad or connection point on the protection plate 2. This avoids poor contact or welding quality problems caused by the position deviation of the tab 13, and prevents the tab 13 from loosening or shifting due to vibration or impact during use. Thus, the tab 13 on the protection plate 2 improves the firmness of the electrical connection between the tab 13 and the protection plate 2.

[0079] Therefore, the battery 100 of the present application embodiment has the advantages of improving battery density and the reliability of electrical connection.

[0080] Specifically, the battery cell 1 includes a housing 12 and a bare battery cell 11. The housing 12 covers the bare battery cell 11, which is rectangular in shape. The bare battery cell 11 can be made by alternating layers of positive and negative electrode plates. Notches are provided on the same side of both the positive and negative electrode plates to form a receiving portion 112 after stacking. The sealing structure corresponds to the head of the bare battery cell 11. Optionally, the housing 12 can be a soft-pack. For example, the housing 12 can be made of an aluminum-plastic composite film.

[0081] As shown in Figures 1, 2, and 11, the battery cell 1 has a top surface and a side surface. The top surface has a receiving portion 112 and a protrusion 111. The side surface is located at one end of the battery cell 1 along a second direction (e.g., the Z direction shown in Figure 1). The protection plate 2 includes a protection plate body 21 and a flexible printed circuit board 22 (PFC) disposed on the protection plate body 21. The protection plate body 21 is disposed within the receiving portion 112. A groove 211 is provided on the side of the protection plate body 21 opposite to the side surface of the battery cell 1. The second direction is perpendicular to the first direction. It is understood that a portion of the tab 13 will be confined between the battery cell 1 and the protection plate 2.

[0082] The battery 100 of this embodiment divides the protection board 2 into a protection board body 21 and a flexible circuit board 22 disposed on the protection board body 21. When the protection board 2 is connected to the tab 13, the tab 13 can be bent and placed in the groove 211, reducing the space occupied by the tab 13 in the thickness direction of the protection board 2. At the same time, the tab 13 is confined between the cell 1 and the protection board 2, thereby preventing the tab 13 from loosening or shifting due to vibration or impact during use, and improving the reliability of the tab 13 connection.

[0083] As shown in Figures 5, 6, and 9, the tab 13 of the battery cell 1 protrudes from the receiving portion 112. It is understood that the tab 13 protruding from the bare battery cell 11 can be directly connected to the protection board 2 installed there, thereby reducing the length of the tab 13. A shorter tab 13 reduces the resistance at that location. Furthermore, the tab 13 protruding from the receiving portion 112 of the bare battery cell 11 can be directly connected to the protection board 2, thus improving the ease of connection between the protection board 2 and the tab 13.

[0084] As shown in Figures 13 and 17, the protective plate body 21 has a conductive sheet 23 on the side adjacent to the groove 211. The conductive sheet 23 is opposite to one end of the battery cell 1. A part of the tab 13 is placed in the groove 211, and the part of the tab 13 extending out of the groove 211 is connected to the protective plate body 21 through the conductive sheet 23. Specifically, in the vertical direction shown in Figure 17, the conductive sheet 23 is disposed on the lower surface of the protective plate body 21.

[0085] The battery 100 of this embodiment is connected to the protection plate body 21 via a tab 13 passing through a groove 211 and a conductive sheet 23. This not only limits the position of the tab 13 through the groove 211 but also provides space for the conductive sheet 23. Furthermore, this increases the available space for the protection plate 2.

[0086] Alternatively, the conductive sheet 23 can be a nickel plate.

[0087] Furthermore, as shown in Figures 14, 15 and 17, the flexible circuit board 22 includes a main body 221 and a U-shaped hook 222 formed by bending one end of the main body 221. The U-shaped hook 222 is engaged with the protective board body 21.

[0088] The battery 100 in this embodiment uses the U-shaped hook 222 of the flexible circuit board 22 to engage with the protective board body 21. Because a small contact area can cause significant heat generation, this design increases the contact area between the flexible circuit board 22 and the protective board body 21, reducing heat generation and improving the safety of the battery 100. The structure of the U-shaped hook 222 effectively reduces resistance during current transmission, minimizing energy loss and improving the overall system efficiency.

[0089] Furthermore, the two end arms of the U-shaped hook 222 are arranged opposite each other along the first direction (the up-down direction shown in FIG. 17), and one end arm of the U-shaped hook 222 is connected to the end of the bare cell 11 with the groove 211. That is to say, the protection plate 2 is placed vertically.

[0090] In some embodiments, the flexible circuit board 22 is disposed near the protrusion 111, and the width of the flexible circuit board 22 is less than 1 / 2 the width of the protective board body 21.

[0091] The battery 100 in this embodiment defines the ratio of the width of the flexible circuit board 22 to the width of the protective board body 21. An excessively large FPC would occupy more additional storage space, which is detrimental to the compactness of the battery 100 (portable devices, such as smartphones and tablets, have relatively high requirements for overall compactness). Furthermore, an excessively large FPC could lead to a bulky device, which does not conform to the design trend of thinness and lightness. Conversely, an excessively small FPC would result in increased resistance and a reduced number of solder joints, leading to high power loss and poor connection strength. Therefore, by reasonably setting the width range between the flexible circuit board 22 and the protective board body 21, the battery 100 achieves the advantages of high portability, low energy consumption, and high connection strength.

[0092] Optionally, the width of the flexible circuit board 22 can be 3mm to 5mm. For example, the width of the flexible circuit board 22 is 3mm, 4mm, or 5mm. The width of the protective board body 21 is greater than 6mm.

[0093] As shown in Figures 2, 11 and 17, the flexible circuit board 22 is located at the end of the protective board body 21 away from the protrusion 111 (the right side shown in Figure 17), and the corner of the battery cell 1 near the flexible circuit board 22 is chamfered.

[0094] In this embodiment of the battery 100, the flexible circuit board 22 is disposed at the end of the protective plate body 21 away from the protrusion 111. The flexible circuit board 22 at this end can be directly led out of the battery cell 1. The flexible circuit board 22 at this end is substantially away from the top folding seal 121. The flexible circuit board 22 disposed at the end away from the protrusion 111 will not cause positional interference with the top folding seal 121.

[0095] As shown in Figures 3 and 6, the battery cell 1 includes a housing 12 and a bare battery cell 11. The housing 12 covers the bare battery cell 11 and has a sealing structure at one end. At one end of the bare battery cell 11, one side of the bare battery cell 11 protrudes from the other side in a third direction (e.g., the left-right direction shown in Figure 17) to form a receiving portion 112 and a protrusion 111. The sealing structure is bent toward the bare battery cell 11 in the area corresponding to the protrusion 111 to form a folded top sealing portion 121. The third direction is perpendicular to the first direction.

[0096] In this embodiment of the battery 100, the top of the protrusion 111 can be sealed by the folded top seal 121 formed by bending, thus eliminating the need for other sealing structures (e.g., sealing stickers) to seal this area. The folded top seal 121 formed by bending greatly reduces the relative sealing surface, thereby significantly reducing the risk of leakage from the casing 12. Moreover, the bent portion of the casing 12 can achieve a better sealing effect without increasing the thickness of the battery 100, which helps to achieve a thinner and lighter design for the battery 100.

[0097] As shown in Figures 5 and 7, the area corresponding to the sealing structure and the receiving part 112 extends along the first direction to form an unfolded top 122.

[0098] In this embodiment of the battery 100, the area corresponding to the sealing structure and the receiving portion 112 is extended along the first direction to form an unfolded top 122, which can provide a limit for the protection plate 2 to prevent the protection plate 2 from shifting, ensure that the protection plate 2 is accurately aligned, and reduce the risk of poor contact.

[0099] For example, as shown in Figure 5, the upper edge of the unfolded top 122 extends out of the receiving portion 112.

[0100] As shown in Figures 5 and 11, the unfolded top 122 is positioned lower than the folded top cover 121. The projection of the connecting edge 1212 between the folded top cover 121 and the unfolded top 122 in the second direction is one of an oblique line (as shown in Figure 5), a right angle (as shown in Figure 19), or a curve. The second direction is perpendicular to each of the first and third directions. In other words, the folded top cover 121 and the unfolded top 122 have an oblique transition, a right angle transition, or a curved transition.

[0101] In this embodiment of the battery 100, the unfolded top 122 is positioned lower than the folded top seal 121, preventing the unfolded top 122 from being affected by the bending of the folded top seal 121. This ensures that the folded top seal 121 can be tightly fitted to the protrusion 111 after bending to provide insulation coverage for the bare battery cell 11. Consequently, the ease of sealing at this point is improved by the sealing structure.

[0102] Accordingly, as shown in Figures 5 to 7, there is an inclined transition between the folded top cover 121 and the unfolded top 122, and the transition surface 1112 between the protrusion 111 and the receiving part 112 is an inclined surface.

[0103] As shown in Figures 5 and 11, the transition surface 1112 between the protrusion 111 and the receiving part 112 is an inclined surface.

[0104] The battery 100 of this application embodiment has an inclined transition surface 1112 between the protrusion 111 and the receiving portion 112. This inclined transition surface 1112, compared to a rough or uneven transition surface 1112, helps to increase the effective capacity of the bare cell 11. Therefore, the inclined transition surface 1112 between the protrusion 111 and the receiving portion 112 further increases the capacity density of the battery 100.

[0105] This application is not limited to this; in other embodiments, the transition surface 1112 between the protrusion 111 and the receiving portion 112 may also be a straight surface or a curved surface. Similarly, this further increases the capacity density of the battery 100.

[0106] In this application embodiment, the shapes of the connecting edge 1212 and the transition surface 1112 can be set to be consistent. For example, the transition surface 1112 between the protrusion 111 and the receiving part 112 can be a curved surface, and the connecting edge 1212 between the folded top sealing part 121 and the unfolded top 122 can be set as a straight tangent surface.

[0107] In some other embodiments, as shown in Figures 15 to 19, a recess 113 lower than the receiving portion 112 is provided between the protrusion 111 and the receiving portion 112.

[0108] The battery 100 of this embodiment has a recess 113 between the protrusion 111 and the receiving portion 112, which is lower than the receiving portion 112. This provides space for the bent sealing edge, thereby accommodating a wider protection plate 2. The increased width of the protection plate 2 helps to increase the current flowing through the protection plate 2, avoiding the problem of severe overheating at this location.

[0109] Alternatively, as shown in Figure 18, the shape of the recess 113 can be a square recess, a triangular recess, or a circular recess.

[0110] Optionally, the protrusion 111 and the receiving portion 112 are inclined to form an inclined surface, and the side of the protective plate 2 opposite to the inclined surface has a mating surface that is in the same direction as the inclination of the inclined surface. In other embodiments, the transition surface 1112 between the protrusion 111 and the receiving portion 112 can also be a right-angled surface, and the side of the protective plate 2 opposite to the right-angled surface is a straight surface adapted to the right-angled surface. That is, the shape of the transition surface 1112 is adapted to the shape of the end of the protective plate 2, avoiding the problem of the size limitation of the protective plate 2 caused by the mismatch between the shape of the protective plate 2 and the transition surface 1112, thereby helping to make full use of the size space of the receiving portion 112. Therefore, it helps to increase the coverage area of ​​the protective plate 2.

[0111] As shown in Figures 15 and 16, the protrusion 111 has a first chamfer 1111 at the corner on the side of the third direction away from the receiving portion 112. For example, the first chamfer 1111 is provided on the left side as shown in Figure 5.

[0112] The battery 100 of this application embodiment has a first chamfer 1111 provided at the corner of the protrusion 111 on the side away from the receiving portion 112 in a third direction. The chamfer structure can effectively disperse the stress at the sharp point of the protrusion 111, prevent the casing 12 from easily breaking when subjected to external pressure or impact due to the sharp corner, help reduce the risk of electrolyte leakage, and increase the service life of the battery 100.

[0113] Optionally, the first chamfer 1111 can be one of a straight chamfer, an arc chamfer, and a bevel chamfer.

[0114] As shown in Figures 1 to 3, the corner of the top sealing part 121 corresponding to the first chamfer 1111 of the bare cell 11 has a sealing edge chamfer 1211, and the lower edge of the sealing edge chamfer 1211 is level with or higher than the upper end surface of the protrusion 111.

[0115] The battery 100 of this application embodiment, by having the lower edge of the sealing edge chamfer 1211 level with or higher than the upper surface of the protrusion 111, ensures that the sealing edge structure can fit tightly against the top area of ​​the corresponding protrusion 111 after the top sealing portion 121 is bent, thereby saving unnecessary space occupied inside the electrical device. This helps to increase the volume of the bare cell 11, and further improves the density of the battery 100.

[0116] Furthermore, as shown in Figure 5, the distance between the lower edge of the edge-sealing chamfer 1211 and the upper end face of the protrusion 111 is X1, where X1 is less than 0.3mm. Therefore, by limiting the range of X1, it avoids the possibility that an excessively large X1 would prevent the bent top seal 121 from failing to fit snugly against the top of the protrusion 111. This saves unnecessary space within the electrical equipment and helps increase the volume of the bare cell 11. Consequently, it further improves the energy density of the battery 100.

[0117] As shown in Figures 15 to 17, the bare cell 11 forms a receiving portion 112, and the corner on the side opposite to the protrusion 111 (the right side as shown in Figure 17) has a second chamfer 1121. This prevents the sharp edges of the bare cell 11 from cracking upon impact. This helps reduce the risk of electrolyte leakage and increases the lifespan of the battery 100.

[0118] Optionally, the second chamfer 1121 can be one of a straight chamfer, an arc chamfer, and a bevel chamfer.

[0119] Accordingly, as shown in Figure 5, the upper edge of the unfolded top 122 is lower than or equal to the upper surface of the protrusion 111. This prevents the unfolded top 122 from bending when the folded top 121 is bent, as a bent unfolded top 122 would interfere with the installation of the protective plate 2. This improves the ease of installation of the protective plate 2.

[0120] Furthermore, as shown in Figure 5, the distance between the upper edge of the unfolded top 122 and the upper end face of the protrusion 111 is X2, which is less than 0.3mm. Similarly, to avoid an excessively large distance between the upper edge of the unfolded top 122 and the upper end face of the protrusion 111, the space enclosed by the folded top seal 121, the unfolded top 122, and the bare battery cell 11 cannot effectively position the protection plate 2. Therefore, by limiting the range of X2, the protection plate 2 can be effectively positioned.

[0121] As shown in Figures 1, 7, and 8, the length of the protrusion 111 in the third direction (the X direction in Figure 1, which is the width direction of the battery 100) is A, the length of the receiving portion 112 in the third direction is B, and the width of the protective plate 2 is W, where B > W; in the first direction (the Y direction in Figure 1, which is the height direction of the battery 100), the width of the receiving portion 112 is C, and the width of the protective plate 2 is W, where C > W; in the second direction (the Z direction in Figure 1, which is the thickness direction of the battery 100), the depth of the receiving portion 112 is D, and the thickness of the protective plate 2 is H, where D > H. It can be understood that the size of the receiving portion 112 is larger than the size of the protective plate 2, thus ensuring that the entire protective plate 2 can fall within the receiving portion 112.

[0122] In this embodiment of the battery 100, by placing the entire protection plate 2 within the receiving portion 112, the problem of the protection plate 2 protruding outside the bare cell 11 and occupying the overall space of the battery 100, which would affect the energy density of the battery 100, is avoided. Therefore, the size of the protection plate 2 being smaller than the size of the receiving portion 112 helps to further improve the energy density of the battery 100.

[0123] As shown in Figure 10, along the third direction, the minimum distance between the protective plate 2 and the protrusion 111 is a1. If the protective plate 2 is a single flexible circuit board 22, a1 is 0mm to 2mm. If the protective plate 2 is a double flexible circuit board 22 (PFC, Flexible Printed Circuit), a1 is 3mm to 6mm.

[0124] The battery 100 in this embodiment of the application ensures that the FPC has a certain range of motion by limiting the distance a1 between the flexible circuit board 22 and the protrusion 111, thus preventing installation interference between the flexible circuit board 22 and the sealing structure 21.

[0125] Optionally, if the protection board 2 is a dual PFC, a1 can be 3mm, 4mm, 5mm or 6mm. If the protection board 2 is a single flexible circuit board 22, a1 can be 0mm, 1mm or 2mm.

[0126] On the same side in the third direction, the distance between the protection plate 2 and the side of the cell 1 on the side away from the protrusion 111 (the right side shown in FIG10) is a2, and a2 is 3mm to 6mm.

[0127] The battery 100 of this embodiment defines the range of the distance a2 between the protection plate 2 and the side of the cell 1 on the side away from the protrusion 111. This avoids the problem of the protection plate 2 being too small due to an excessively large distance. If the protection plate 2 is too small, it will not be able to accommodate a conductive path of sufficient width and thickness, which will lead to an increase in resistance.

[0128] Furthermore, the small size of protection board 2 cannot provide sufficient connection area, resulting in weak electrical connections and a tendency for poor contact or open circuits. Therefore, limiting the range of a2 helps improve the reliability of the electrical connection of protection board 2 and reduce the resistance when protection board 2 conducts electricity.

[0129] Referring to Figure 10, in the first direction, the distance between the upper end face of the protective plate 2 and the upper end face of the protrusion 111 is b1, where b1 can be 0 to 0.5 mm, and the distance between the lower edge of the protective plate 2 and the inner wall surface of the receiving portion 112 is b2, where b2 is 0 to 1 mm. This avoids the problem of the protective plate 2 protruding outside the receiving portion 112 and occupying internal space of the electrical equipment, allowing for the accommodation of a larger volume of the bare battery cell 11 without increasing the overall size of the electrical equipment. This achieves effective utilization of the overall space of the battery 100 and increases the density of the battery 100.

[0130] Optionally, b1 can be 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or 0.5 mm.

[0131] Optionally, b2 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1.0mm.

[0132] As shown in Figures 2 and 20, the battery 100 in this embodiment of the application further includes a buffer layer 4, which is disposed between the edge sealing structure and the protective plate 2.

[0133] Optionally, the buffer layer 4 can be foam or a silicone pad. To protect the top of the bare cell 11 from impacts from the protective plate 2, a buffer such as foam or a silicone pad can be attached between the two.

[0134] In some embodiments, the battery 100 of this application may further include an adhesive layer 5, which is disposed between the folded-out top 122 and the protective plate 2. For example, the adhesive layer 5 may be double-sided tape. It serves both as a fixation element and as a cushioning and protective element.

[0135] Optionally, the adhesive layer 5 and the cushioning layer 4 can be integrated into a single structure. For example, the adhesive layer 5 and the cushioning layer 4 can be integrated into foam adhesive or double-sided adhesive.

[0136] The battery 100 in this embodiment of the application also includes an insulating seal layer 6. The insulating seal layer 6 and the sealing structure and the area corresponding to the receiving portion 112 form a protective plate cavity 3. A portion of the protective plate 2 is disposed in the protective plate cavity 3.

[0137] Optionally, the insulating seal 6 can be an adhesive layer or an adhesive tape seal.

[0138] Furthermore, the insulating sealant 6 can be divided into a head sealant layer 61 and a top sealant layer 62. Moreover, the insulating sealant 6 can be an adhesive injection structure located at the head of the battery 100. With this adhesive injection structure, the head adhesive tape can be eliminated. Applying adhesive to the head of the battery 100, where the protection board 2 is placed, helps improve the overall structural reliability. Applying adhesive to the head of the battery 100 improves the overall structural reliability.

[0139] As shown in Figure 20, during assembly, the following can be installed in sequence: top sealing adhesive layer 62, buffer layer 4, adhesive layer 5, protective plate 2, and head adhesive layer 61.

[0140] The electrical equipment assembly of this application embodiment includes a battery 100 according to any one of the above claims. Because the battery 100 has a receiving portion 112 at one end in a first direction, at least a portion of the protection plate 2 is housed within the receiving portion 112. Therefore, the battery 100 module of this application embodiment has the advantages of high battery density and high ease of operation.

[0141] The battery 100 provided in this application embodiment includes a battery cell and a protection board 2.

[0142] The battery cell has a receiving portion 112 and a protrusion 111 at one end of the battery 100 in a first direction (vertical direction as shown in FIG. 25) (e.g., the upper end in FIG. 13). The battery cell includes a bare battery cell 11 and a housing 12 covering the bare battery cell 11. The housing 12 has a sealing edge structure 24 at the end of the battery 100 in the first direction. The area of ​​the sealing edge structure 24 corresponding to the protrusion 111 extends from one end of the bare battery cell 11 and is folded towards that end to form a folded top sealing portion 121. The area of ​​the sealing edge structure 24 corresponding to the receiving portion 112 extends outward along the first direction to form an unfolded top 122. At least a portion of the protection plate 2 is housed in the receiving portion 112, and the protection plate 2 is electrically connected to the battery cell.

[0143] The battery 100 of this application embodiment avoids the problem of excessive space occupied by the installation of the protection plate 2 by providing a receiving portion 112 for accommodating the protection plate 2 at one end of the cell. By placing the protection plate 2 in the receiving portion 112 formed by the bare cell 11 itself, the utilization rate of the space at one end (head) of the bare cell 11 is optimized. A larger volume bare cell 11 can be accommodated without increasing the overall size of the battery 100, thus realizing the effective utilization of the overall space of the battery 100 and improving the energy storage capacity and battery density of the entire system.

[0144] Furthermore, in the battery 100 of this application embodiment, the sealing structure 24 is folded and bent towards one end to form a folded top sealing portion 121. Moreover, the bent shell 12 portion does not increase the volume of the battery 100, which can reduce the problem of the sealing structure 24 occupying too much space and affecting the space utilization of the battery 100, thereby further improving the energy storage capacity and battery density of the entire battery 100.

[0145] Meanwhile, the area corresponding to the sealing structure 24 and the receiving portion 112 extends outward along the first direction to form an unfolded top 122. This unfolded top 122 provides a clear installation position for the protective plate 2 and also limits the position of the protective plate 2. This improves the convenience and stability of installing the protective plate 2.

[0146] Therefore, the battery 100 of this application embodiment has the advantages of high battery density and high ease of installation.

[0147] As shown in Figures 1 to 2, 5 to 7, and 21, the receiving portion 112 is disposed near one corner of the battery 100 along a third direction, and the protrusion 111 is disposed near another corner of the battery 100 along a third direction (the left-right direction shown in Figure 25), with the third direction being perpendicular to the first direction. For example, as shown in Figure 5, the receiving portion 112 is disposed on one side of the upper end of the bare cell 11 so that the protrusion 111 and the receiving portion 112 are formed on the bare cell 11. The receiving portion 112 is disposed on the right side of the receiving portion 112, and the unfolded top 122 is disposed at its upper end higher than the bottom of the receiving portion 112.

[0148] The battery 100 of this application embodiment divides one end of the battery cell in a first direction into a receiving portion 112 and a protrusion 111. This avoids the inconvenience of sandwiching the receiving portion 112 between the two protrusions 111, thus preventing the sealing of the sealing structure 24 corresponding to the receiving portion 112. By placing the receiving portion 112 on one side of the battery 100 of this application embodiment, it is beneficial to reduce the sealing joint surface of the casing 12 and improve the convenience of sealing the bare battery cell 11 by the casing 12.

[0149] As shown in Figure 24, the folded top seal 121 extends along a third direction to the area corresponding to the transition surface 1112 to form a limiting edge 213. The folded top seal 121, the inclined surface (i.e. the transition surface), and the unfolded top 122 enclose a limiting cavity 10. The side of the protective plate 2 opposite to the inclined surface (e.g., the left side shown in Figure 25) is placed in the limiting cavity 10.

[0150] The battery 100 of this embodiment places a portion of the protection plate 2 within a limiting cavity 10 formed by the folded top seal 121, the inclined surface, and the unfolded top 122. During installation, one end of the protection plate 2 can be inserted into the limiting cavity 10 first to limit the installation of the protection plate 2; this further assists in limiting the installation of the protection plate 2 and prevents displacement during installation. This improves the ease of positioning the protection plate 2 during installation.

[0151] The electrical device in this embodiment includes the battery 100 described above. The area corresponding to the sealing structure 24 and the receiving portion 112 extends outward along a first direction to form an unfolded top 122. This unfolded top 122 provides a clear installation position and limit for the protection plate 2, ensuring accurate alignment and reducing the risk of poor contact. Therefore, the battery 100 in this embodiment has the advantages of high battery density and ease of installation.

[0152] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

[0153] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application.

[0154] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0155] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0156] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0157] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. 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.

[0158] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery, characterized in that, include: The battery cell has a receiving portion and a protrusion at one end of the battery in a first direction; A protective plate, at least a portion of which is housed within the receiving portion.

2. The battery according to claim 1, characterized in that, The protective plate has a groove on one side, and a portion of the electrode tab of the battery cell is disposed within the groove.

3. The battery according to claim 2, characterized in that, The battery cell has a top surface and a side surface. The top surface has the receiving portion and the protrusion. The side surface is located at one end of the battery cell along a second direction. The protection plate includes a protection plate body and a flexible circuit board disposed on the protection plate body. The protection plate body is disposed in the receiving portion. The groove is provided on the side of the protection plate body opposite to the side surface of the battery cell. The second direction is perpendicular to the first direction.

4. The battery according to claim 3, characterized in that, The electrode tabs of the battery cell protrude from the receiving portion outside the battery cell; The protective plate body has a conductive sheet on the side adjacent to the groove. The conductive sheet is opposite to one end of the battery cell along the second direction. A portion of the electrode tab is bent and placed in the groove, and the portion of the electrode tab extending out of the groove is connected to the protective plate body through the conductive sheet.

5. The battery according to claim 4 or 5, characterized in that, The flexible circuit board is positioned close to the protrusion, and the width of the flexible circuit board is less than 1 / 2 the width of the protective plate body.

6. The battery according to claim 4 or 5, characterized in that, In the third direction, the flexible circuit board is disposed at the end of the protective plate body away from the protrusion, and the corner of the battery cell near the flexible circuit board is chamfered. The second direction is perpendicular to each of the first direction and the third direction.

7. The battery according to any one of claims 1 to 6, characterized in that, The battery cell includes a housing and a bare battery cell. The housing covers the bare battery cell. The housing has a sealing structure at one end in the first direction of the battery. At one end of the bare battery cell along the first direction, the bare battery cell protrudes from one side to the other side in a third direction to form the receiving portion and the protrusion. The area of ​​the sealing structure corresponding to the protrusion is bent toward the bare battery cell to form a folded top sealing portion. The third direction is perpendicular to the first direction.

8. The battery according to claim 7, characterized in that, The edge sealing structure and the area corresponding to the receiving part extend along the first direction to form an unfolded top.

9. The battery according to claim 8, characterized in that, The corner of the top sealing portion corresponding to the first chamfer of the bare battery cell has a sealing edge chamfer, and the lower edge of the sealing edge chamfer is level with or higher than the upper end surface of the protrusion.

10. The battery according to claim 8 or 9, characterized in that, The upper edge of the unfolded top is lower than or equal to the upper surface of the protrusion.

11. The battery according to claim 9 or 10, characterized in that, The distance between the lower edge of the edge-sealing chamfer and the upper end face of the protrusion is X1, where X1 is less than 0.3mm.

12. The battery according to any one of claims 9 to 11, characterized in that, The distance between the upper edge of the unfolded top and the upper end face of the protrusion is X2, where X2 is less than 0.3mm.

13. The battery according to any one of claims 9 to 12, characterized in that, The length of the receiving part in the third direction is B, and the width of the protective plate is W, where B > W.

14. The battery according to any one of claims 9 to 13, characterized in that, In the first direction, the width of the receiving portion is C, and the width of the protective plate is W, where C > W.

15. The battery according to any one of claims 9 to 14, characterized in that, In the second direction, the depth of the receiving portion is D, the thickness of the protective plate is H, where D>H, and the protective plate is disposed in the groove at the end away from the unfolded top. The second direction is perpendicular to either the first direction or the third direction.

16. The battery according to any one of claims 13 to 15, characterized in that, Along the third direction, the minimum distance between the protective plate and the protrusion is a1. If the protective plate is a single flexible circuit board, a1 is 0mm to 2mm. If the protective plate is a double flexible circuit board, a1 is 3mm to 6mm.

17. The battery according to any one of claims 13 to 16, characterized in that, On the same side of the third direction, the distance between the protective plate at the end away from the protrusion and the side of the battery cell is a2, where a2 is 3mm to 6mm.

18. The battery according to any one of claims 13 to 17, characterized in that, In the first direction, the distance between the upper end face of the protective plate and the upper end face of the protrusion is b1, where b1 is 0 to 0.5 mm.

18. The battery according to any one of claims 13 to 17, characterized in that, in the first direction, the distance between the lower edge of the protective plate and the inner wall surface of the receiving portion is b2, where b2 is 0 to 1 mm.

19. The battery according to claim 7, characterized in that, The protection board is electrically connected to the battery cell. The receiving portion is disposed near one of the corners of the battery along a third direction, and the protrusion is disposed near the other corner of the battery along a third direction, wherein the second direction is perpendicular to the first direction.

20. The battery according to claim 19, characterized in that, The folded top seal extends along the third direction to the area corresponding to the transition surface between the protrusion and the groove to form a limiting edge. The limiting edge, the inclined surface, and the unfolded top surround a limiting cavity. The side of the protective plate opposite to the inclined surface is placed in the limiting cavity.

21. An electrical appliance, characterized in that, Includes the battery according to any one of claims 1 to 20.

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