Battery and electronic device

Abstract

The invention relates to the technical field of batteries, and particularly provides a battery and electronic equipment. The battery comprises a battery cell and a circuit protection board, the battery cell comprises an electrode assembly and a shell; the electrode assembly comprises a first tab and a second tab; the shell comprises a main body part; the main body part is provided with a convex part and a concave part; the top sealing edge is located in the head area; the circuit protection board comprises a substrate, a first connecting sheet and a second connecting sheet. The substrate is arranged in the concave part, the first connecting sheet is connected with the first tab, and the second connecting sheet is connected with the second tab. In the invention, the concave part forms the accommodating space of the substrate, so that the space occupied by opposite arrangement of the substrate and the shell in the prior art is reduced, and meanwhile, the first connecting sheet and the second connecting sheet are connected with the first tab and the second tab, so that the space occupied by overlapping connection of the first connecting sheet, the second connecting sheet and the substrate is reduced; therefore, the space waste of the battery can be reduced, and the energy density of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically provides a battery and an electronic device. Background Art

[0002] Currently, terminal devices such as mobile phones and tablets have become relatively important technological products in people's lives, learning, and entertainment. With the development of technology and the upgrade of the user experience, terminal devices are developing in the direction of long battery life and compact structure. However, in the existing battery structure, the protection board assembly is connected to the head region of the battery cell, resulting in low space utilization rate, affecting the overall volume energy density of the battery, and it is difficult to meet the requirements of some electronic devices for reducing the battery compartment space. Summary of the Invention

[0003] The purpose of the present application is to solve at least part of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0004] In a first aspect, the present application provides a battery, which includes a battery cell and a circuit protection board; the battery cell includes an electrode assembly and a housing, the electrode assembly includes a first tab and a second tab extending out of the housing; the housing includes a main body portion and a top sealing edge provided at one end of the main body portion; the main body portion has a head region, and the head region is provided with a protruding portion and a recessed portion, and the protruding portion and the recessed portion are arranged along a first direction; the top sealing edge is located in the head region; the circuit protection board includes a substrate and a first connecting piece and a second connecting piece respectively connected to the substrate; the substrate is disposed in the recessed portion, the first connecting piece is connected to the first tab, and the second connecting piece is connected to the second tab.

[0005] In some embodiments, the top sealing edge includes a first sealing edge portion corresponding to the protruding portion and a second sealing edge portion corresponding to the recessed portion, and the edge of the first sealing edge portion is located on the side of the second sealing edge portion away from the main body portion; the first sealing edge portion is bent along the thickness direction of the battery; and / or at least part of the projection of the substrate on the second sealing edge portion is located within the second sealing edge portion; and / or the top surface of the protruding portion extends beyond the second sealing edge portion.

[0006] In some embodiments, the housing has a first side and a second side arranged opposite to each other along the first direction; the housing includes a first side sealing edge provided on the first side of the main body portion, the first side sealing edge is close to the protruding portion, and the first side sealing edge is bent along the thickness direction of the battery; there is a notch between the first sealing edge portion and the first side sealing edge, and at least part of the structure of the first sealing edge portion is bent along the thickness direction of the battery; and / or, the housing includes a second side sealing edge provided on the second side of the main body portion, the second side sealing edge is close to the recessed portion, and the second side sealing edge is bent along the thickness direction of the battery; the substrate is located between the second side sealing edge and the side wall of the recessed portion close to the protruding portion.

[0007] In some embodiments, the incision is inclined, the inclination angle of the incision is α, and 30° ≤ α ≤ 60°; and / or, the size of the incision is p, and p ≥ 0.5 mm.

[0008] In some embodiments, the first tab and / or the second tab are bent along the thickness direction of the battery, the dimensions of the first tab and the second tab along the thickness direction of the battery are less than or equal to the thickness of the battery cell, and / or, the first connecting piece is located on the surface of the first tab facing away from the main body portion, and / or, the connecting end of the second tab is located on the surface of the second connecting piece facing away from the main body portion.

[0009] In some embodiments, the width of the protruding portion is less than the width of the recessed portion, and / or the width w of the protruding portion satisfies w ≥ 10 mm, and / or the height difference h between the top surface of the protruding portion and the recessed portion satisfies h ≥ 1 mm.

[0010] In some embodiments, the housing further includes a connecting portion located between the protruding portion and the recessed portion and a connecting sealing portion located between the first sealing edge portion and the second sealing edge portion, and / or the included angle between the connecting sealing portion and the second sealing edge portion is β, and 30° ≤ β ≤ 60°, and / or the connecting end of the connecting sealing portion and the second sealing edge portion extends beyond the connecting portion along the first direction.

[0011] In some embodiments, the first tab is provided at the position of the protruding portion, and the second tab is provided at the position of the recessed portion; or, the first tab and the second tab are provided at the position of the protruding portion; or, the first tab and the second tab are provided at the position of the recessed portion.

[0012] In some embodiments, the electrode assembly includes a plurality of first electrode plates, a plurality of separators, and a plurality of second electrode plates stacked; first soft tabs are respectively formed on the plurality of first electrode plates, and the plurality of first soft tabs are gathered and connected to the first tab; second soft tabs are respectively formed on the plurality of second electrode plates, and the plurality of second soft tabs are gathered and connected to the second tab; grooves are provided at positions of the first electrode plates corresponding to the second soft tabs, and / or, first notches are provided at positions of the first electrode plates connected to the first soft tabs, or the first electrode plates are provided with chamfered corners, and the first soft tabs are connected to the first electrode plates at positions close to the chamfered corners; and / or, grooves are provided at positions of the second electrode plates corresponding to the first soft tabs, and / or, first notches are provided at positions of the second electrode plates connected to the second soft tabs, or the second soft tabs are connected to the second electrode plates at positions close to the sides of the second electrode plates.

[0013] In some embodiments, second notches are respectively provided at positions of the separator corresponding to the first soft tab and the second soft tab, and the depth of the second notch is less than the depth of the first notch; and / or, the depth of the groove is d1, the depth of the first notch is d2, and d1 ≤ 3 mm, and / or d2 ≤ 3 mm.

[0014] In a second aspect, the present application provides an electronic device, which includes the battery in the first aspect.

[0015] The technical solution provided by the present application has at least the following technical effects:

[0016] In the present application, a recessed portion is used to form a receiving space for the substrate in the circuit protection board, thereby reducing the space occupied by the relative arrangement of the substrate and the housing in the prior art. At the same time, the circuit protection board is connected to the first tab and the second tab of the electrode assembly through the first connecting piece and the second connecting piece, thereby reducing the space occupied by the overlapping connection of the first connecting piece, the second connecting piece and the substrate. With the above settings, the present application can reduce the space waste of the battery and improve the energy density of the battery. Description of the Drawings

[0017] In order to better combine the content shown in the drawings of the specification with the content described in the specific embodiments, the drawings of the specification are briefly introduced below. It can be understood that the drawings of the specification mentioned below only schematically show some embodiments of the related technical solutions and the technical solutions of the present application. Without creative efforts, those skilled in the art can also make drawings showing other embodiments.

[0018] Specifically, the annotations of the drawings of the specification are as follows:

[0019] Figure 1 It is a schematic structural diagram of the first type of battery described in some embodiments of the present application;

[0020] Figure 2 It is a front view of the battery cell described in some embodiments of the present application;

[0021] Figure 3 It is a side view of the battery cell described in some embodiments of the present application;

[0022] Figure 4 It is a schematic structural diagram of the first type of electrode assembly described in some embodiments of the present application;

[0023] Figure 5 It is a schematic structural diagram of the first type of first electrode tab described in some embodiments of the present application;

[0024] Figure 6 It is a schematic structural diagram of the second type of first electrode tab described in some embodiments of the present application;

[0025] Figure 7 It is a schematic structural diagram of the first type of second electrode tab described in some embodiments of the present application;

[0026] Figure 8 It is a schematic structural diagram of the first type of separator described in some embodiments of the present application;

[0027] Figure 9 Schematic diagram of the structure of the first type of battery cell in the unfolded state of the first and second tab ears in some embodiments of the present application;

[0028] Figure 10 Schematic diagram of the structure of the second type of battery in some embodiments of the present application;

[0029] Figure 11 Schematic diagram of the structure of the second type of electrode assembly in some embodiments of the present application;

[0030] Figure 12 Schematic diagram of the structure of the third type of electrode assembly in some embodiments of the present application;

[0031] Figure 13 Schematic diagram of the structure of the third type of first electrode tab in some embodiments of the present application;

[0032] Figure 14 Schematic diagram of the structure of the fourth type of first electrode tab in some embodiments of the present application;

[0033] Figure 15 Schematic diagram of the structure of the second type of second electrode tab in some embodiments of the present application;

[0034] Figure 16 Schematic diagram of the structure of the second type of separator in some embodiments of the present application;

[0035] Figure 17 Front view of the second type of battery cell in the unfolded state of the first and second tab ears in some embodiments of the present application;

[0036] Figure 18 Axonometric view of the second type of battery cell in the unfolded state of the first and second tab ears in some embodiments of the present application;

[0037] Figure 19 Schematic diagram of the structure of the fourth type of electrode assembly in some embodiments of the present application;

[0038] Figure 20 Schematic diagram of the structure of the fifth type of electrode assembly in some embodiments of the present application.

[0039] Specifically, the annotations of the reference numerals in the specification drawings are as follows:

[0040] 10. Battery cell; 100. Head region; 101. Protrusion; 102. Depression; 103. Connection part; 110. First tab; 120. Second tab; 130. Housing; 131. Main body part; 132. Top sealing edge; 1321. First sealing part; 1322. Second sealing part; 1323. Connecting sealing part; 133. First side sealing edge; 134. Second side sealing edge; 1301. Cut; 140. Electrode assembly; 141. First electrode plate; 1410. First flexible tab; 142. Second electrode plate; 1420. Second flexible tab; 143. Separator; 1401. Groove; 1402. First notch; 1403. Second notch; 1404. Chamfer; 20. Circuit protection board; 210. Substrate; 220. First connecting piece; 230. Second connecting piece. Detailed implementation manners

[0041] To make the content of the embodiments of the present application clearer, the following will be described with reference to the accompanying drawings of the specification. It can be understood that the content mentioned below is only part of the embodiments of the present application, rather than all the embodiments listed in detail. Therefore, without creative efforts, other embodiments obtained based on the following embodiments all fall within the protection scope of the present application.

[0042] It should be understood that the terms used in the text are only for the purpose of describing specific embodiments, and are not intended to strictly limit the technical solution, unless the context clearly indicates otherwise. For example, the terms "a", "an", and "the" are used to modify features in the text, and it does not exclude the possibility that the feature may also be plural in some other embodiments.

[0043] It should be understood that the terms "include", "comprise", and "have" are open-ended, indicating the existence of the stated features, but do not exclude the possibility that there are other features in this embodiment. Similarly, the terms first, second, etc. are used in the text to describe multiple features, only to distinguish one feature from another. Unless the context clearly indicates otherwise, such terms do not imply order or sequence.

[0044] It should be understood that unless the context clearly indicates otherwise, the terms "set", "connect", and "install" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through a medium. For those skilled in the art, the specific meanings of the above terms in the text can be understood according to the specific situation.

[0045] In addition, for ease of description, terms related to spatial relative relationships will be used in this text to illustrate the position of one feature relative to another feature. For example, "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations in addition to those shown in the accompanying drawings of the specification.

[0046] The embodiments of the present application will be described below in conjunction with the accompanying drawings of the specification. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0047] In a first aspect, referring to Figure 1 , an embodiment of the present application provides a battery, which includes a battery cell 10 and a circuit protection board 20; the battery cell 10 includes an electrode assembly 140 and a housing 130, and the electrode assembly 140 includes a first tab 110 and a second tab 120 extending out of the housing 130; the housing 130 includes a main body portion 131 and a top sealing edge 132 provided at one end of the main body portion 131; the main body portion 131 has a head region 100, and the head region 100 is provided with a protruding portion 101 and a recessed portion 102, and the protruding portion 101 and the recessed portion 102 are arranged in the first direction; the top sealing edge 132 is located in the head region 100; the circuit protection board 20 includes a substrate 210, a first connecting piece 220 and a second connecting piece 230 respectively connected to the substrate 210; the substrate 210 is disposed in the recessed portion 102, the first connecting piece 220 is connected to the first tab 110, and the second connecting piece 230 is connected to the second tab 120.

[0048] In this embodiment, the recessed portion 102 is used to form a receiving space for the substrate 210 in the circuit protection board 20, thereby reducing the space occupied by the relative arrangement of the substrate 210 and the housing 130 in the prior art. At the same time, the circuit protection board 20 is connected to the first tab 110 and the second tab 120 of the electrode assembly 140 through the first connecting piece 220 and the second connecting piece 230, thereby reducing the space occupied by the overlapping connection of the first connecting piece 220, the second connecting piece 230 and the substrate 210. With the above settings, the present application can reduce the space waste of the battery and improve the energy density of the battery.

[0049] Optionally, the first direction may be the width direction of the battery.

[0050] In some embodiments, referring to Figure 1 and Figure 2, the top sealing edge 132 includes a first sealing edge portion 1321 corresponding to the convex portion 101 and a second sealing edge portion 1322 corresponding to the concave portion 102. The edge of the first sealing edge portion 1321 is located on the side of the second sealing edge portion 1322 away from the main body portion 131; the first sealing edge portion 1321 is bent along the battery thickness direction; and / or at least a part of the projection of the substrate 210 on the second sealing edge portion 1322 is located within the second sealing edge portion 1322; and / or the top surface of the convex portion 101 exceeds the second sealing edge portion 1322.

[0051] In this embodiment, by bending the first sealing edge portion 1321, the overall length of the battery cell 10 is further reduced, the space utilization rate of the battery cell 10 is improved, and the energy density is further increased; furthermore, the substrate 210 is located within the projection of the second sealing edge portion 1322, which can effectively protect the substrate 210 and prevent the substrate 210 from being collided; in addition, the top surface of the convex portion 101 exceeds the second sealing edge portion 1322, which further increases the energy density of the battery. At the same time, it can also provide protection for the substrate 210 to prevent the substrate 210 from moving left and right; moreover, the higher the top surface of the convex portion 101, that is, the greater the height difference between the convex portion 101 and the concave portion 102, thus providing a buffer space for the expansion of the electrode assembly 140 inside the housing 130.

[0052] In some embodiments, referring to Figure 1 , the housing 130 has a first side and a second side oppositely arranged along a first direction; the housing 130 includes a first side sealing edge 133 provided on the first side of the main body portion 131. The first side sealing edge 133 is close to the convex portion 101 and is bent along the battery thickness direction; there is a notch 1301 between the first sealing edge portion 1321 and the first side sealing edge 133, and at least a part of the structure of the first sealing edge portion 1321 is bent along the battery thickness direction; and / or the housing 130 includes a second side sealing edge 134 provided on the second side of the main body portion 131. The second side sealing edge 134 is close to the concave portion 102 and is bent along the battery thickness direction; the substrate 210 is located between the second side sealing edge 134 and the side wall of the concave portion 102 close to the convex portion 101.

[0053] In this embodiment, there is a notch 1301 between the first sealing edge portion 1321 and the first side sealing edge 133, so that when the first sealing edge portion 1321 and the first side sealing edge 133 are bent, the two avoid each other through the notch 1301 to prevent interference; in addition, by the substrate 210 being located between the second side sealing edge 134 and the side wall of the concave portion 102 close to the convex portion 101, the substrate 210 is protected to prevent the substrate 210 from being damaged by knocking.

[0054] In some embodiments, referring to Figure 2 and Figure 9, the cut 1301 is inclined, the inclination angle of the cut 1301 is α, and 30°≤α≤60°; and / or, the size of the cut 1301 is p, and p≥0.5mm.

[0055] In this embodiment, the inclination angle α of the cut 1301 can be any value among 30°, 35°, 40°, 45°, 50°, 55° and 60° or the range between any two values; preferably, α is 45°; the above settings facilitate the folding of the first edge-sealing portion 1321 and the first side edge-sealing 133, which is beneficial to manufacturing. In addition, the size p of the cut 1301 is not less than 0.5mm to prevent the cut 1301 from being too small and causing interference when the first edge-sealing portion 1321 and the first side edge-sealing 133 are folded.

[0056] In some embodiments, referring to Figure 3 , the first tab 110 and / or the second tab 120 are bent along the thickness direction of the battery, the dimensions of the first tab 110 and the second tab 120 along the thickness direction of the battery are less than or equal to the thickness of the battery cell 10, and / or, referring to Figure 1 , the first connecting piece 220 is located on the surface of the first tab 110 facing away from the main body portion 131, and / or, the connecting end of the second tab 120 is located on the surface of the second connecting piece 230 facing away from the main body portion 131.

[0057] In this embodiment, the first tab 110 and the second tab 120 can be bent once or repeatedly so that their dimensions along the thickness direction of the battery are less than or equal to the thickness of the battery cell 10, thereby ensuring that the overall thickness dimension of the battery is small and avoiding interference with other electronic devices. In addition, referring to Figure 1 , in some embodiments, after the first tab 110 is bent, it is located inside the first connecting piece 220 of the circuit protection board 20, thereby protecting the first tab 110 from being knocked by other electronic devices and causing the tab to break; in other embodiments, after the second tab 120 is bent, it is located on the surface of the substrate 210 facing away from the electrode assembly 140 to prevent the substrate 210 from moving in the length direction of the battery.

[0058] Optionally, referring to Figure 3 , the thickness of the battery cell 10 is D, and 2mm≤D≤6mm.

[0059] In some embodiments, referring to Figure 2 , the width of the protrusion 101 is less than the width of the recess 102, and / or the width w of the protrusion 101 satisfies w≥10mm, and / or the height difference h between the top surface of the protrusion 101 and the recess 102 satisfies h≥1mm.

[0060] In this embodiment, the width of the convex portion 101 is smaller than that of the concave portion 102, mainly considering reserving sufficient space for the circuit protection board 20; meanwhile, preventing the convex portion 101 from being too large, resulting in excessive stress on the step surface between the convex portion 101 and the concave portion 102 and causing the pole piece to tear; in addition, the width w of the convex portion 101 ≥ 10 mm, thereby improving the energy density of the battery; furthermore, the height difference h between the top surface of the convex portion 101 and the concave portion 102 ≥ 1 mm, thereby ensuring sufficient accommodation space for the substrate 210.

[0061] In some embodiments, referring to Figure 9 , the housing 130 further includes a connecting portion 103 located between the convex portion 101 and the concave portion 102 and a connecting edge-sealing portion 1323 located between the first edge-sealing portion 1321 and the second edge-sealing portion 1322, and / or the included angle between the connecting edge-sealing portion 1323 and the second edge-sealing portion 1322 is β, and 30° ≤ β ≤ 60° is satisfied, and / or the connecting end of the connecting edge-sealing portion 1323 and the second edge-sealing portion 1322 extends beyond the connecting portion 103 along the first direction.

[0062] In this embodiment, the included angle β between the connecting edge-sealing portion 1323 and the second edge-sealing portion 1322 satisfies 30° ≤ β ≤ 60°, and the connecting end of the connecting edge-sealing portion 1323 and the second edge-sealing portion 1322 extends beyond the connecting portion 103 along the first direction. On the one hand, it makes the connecting edge-sealing portion 1323 easier to bend, and the bent connecting edge-sealing portion 1323 can effectively protect the connecting portion 103. On the other hand, during the charge and discharge process, the battery cell 10 expands, and the connecting portion 103 area is easily squeezed and cracked. By setting the connecting edge-sealing portion 1323 wider, the expansion stress received by the connecting edge-sealing portion 1323 can be effectively dispersed, preventing the connecting edge-sealing portion 1323 from cracking and leaking liquid.

[0063] In some embodiments, referring to Figure 1 , a first tab 110 is provided at the position of the convex portion 101, and a second tab 120 is provided at the position of the concave portion 102; or, in some embodiments not shown in the figure, a first tab 110 and a second tab 120 are provided at the position of the convex portion 101; or, referring to Figure 10 , Figure 17 and Figure 18 , a first tab 110 and a second tab 120 are provided at the position of the concave portion 102.

[0064] In this embodiment, referring to Figure 10 , Figure 17 and Figure 18 , a first tab and a second tab are provided at the position of the concave portion, which can further reduce the size of the battery in the length direction and improve the volumetric energy density; in addition, referring to Figure 1, a first tab is provided at the position of the convex portion, and a second tab is provided at the position of the concave portion; alternatively, in some embodiments not shown in the figure, both the first tab and the second tab are provided at the position of the convex portion; the above are all preferable embodiments.

[0065] In some embodiments, referring to Figures 4 to 8 , Figures 11 to 16 and Figure 19 and Figure 20 , the electrode assembly 140 includes a plurality of first electrode plates 141, a plurality of separators 143, and a plurality of second electrode plates 142 stacked; first soft tabs 1410 are respectively formed on the plurality of first electrode plates 141, and the plurality of first soft tabs 1410 are gathered and connected to the first tab 110; second soft tabs 1420 are respectively formed on the plurality of second electrode plates 142, and the plurality of second soft tabs 1420 are gathered and connected to the second tab 120; referring to Figure 5 , Figure 6 , Figure 13 and Figure 14 , a groove 1401 is provided at the position of the first electrode plate 141 corresponding to the second soft tab 1420, and / or, referring to Figure 13 , in some embodiments, a first notch 1402 is provided at the position where the first electrode plate 141 is connected to the first soft tab 1410, or referring to Figure 6 and Figure 14 , the first electrode plate 141 is provided with a chamfer 1404, and the first soft tab 1410 is connected to the first electrode plate 141 at a position close to the chamfer 1404; and / or, referring to Figure 7 , a groove 1401 is provided at the position of the second electrode plate 142 corresponding to the first soft tab 1410, and / or, referring to Figure 7 and Figure 15 , a first notch 1402 is provided at the position where the second electrode plate 142 is connected to the second soft tab 1420, or referring to Figure 4 , the second soft tab 1420 is connected to the second electrode plate 142 at a position close to the side of the second electrode plate 142.

[0066] In this embodiment, the above methods are all preferable embodiments, and can all achieve the effect of facilitating the gathering of the plurality of first soft tabs 1410 and the plurality of second soft tabs 1420, and avoiding the first electrode plate 141 and the second electrode plate 142 from restricting the first soft tab 1410 and the second soft tab 1420; among them, referring to Figure 6 , the first electrode plate 141 is provided with a chamfer 1404, and the first soft tab 1410 is connected to the first electrode plate 141 at a position close to the chamfer 1404, which not only makes the chamfer 1404 correspond to the notch 1301 on the housing 130, but also can facilitate the operation of gathering the plurality of first soft tabs 1410 without setting the first notch 1402; similarly, referring to Figure 4, the second soft tab 1420 is connected to a position on the second electrode tab 142 close to the side of the second electrode tab 142, and it is also convenient to perform the operation of gathering multiple second soft tabs 1420 without setting the first notch 1402.

[0067] In some embodiments, referring to Figure 4 , Figure 8 , Figure 11 , Figure 12 , Figure 16 , Figure 19 and Figure 20 , the separator 143 is respectively provided with second notches 1403 at positions corresponding to the first soft tab 1410 and the second soft tab 1420, and the depth of the second notch 1403 is less than the depth of the first notch 1402; and / or, the depth of the groove 1401 is d1, the depth of the first notch 1402 is d2, and d1≤3mm is satisfied, and / or d2≤3mm.

[0068] In this embodiment, the depth of the second notch 1403 on the separator 143 is less than that of the first notch 1402, realizing the full coverage of the separator 143 on the first electrode tab 141 and the second electrode tab 142 to avoid short circuit; in addition, the depth d1 of the groove 1401≤3mm, and the depth d2 of the first notch 1402≤3mm, thereby ensuring the energy density.

[0069] Optionally, the first electrode tab 141 is a positive electrode tab, and the second electrode tab 142 is a negative electrode tab; or, the first electrode tab 141 is a negative electrode tab, and the second electrode tab 142 is a positive electrode tab.

[0070] In some exemplary embodiments, the positive electrode tab may include a positive electrode current collector and a positive electrode active material layer provided on the surface of the positive electrode current collector. Exemplarily, the positive electrode current collector may be made of aluminum foil. Of course, other positive electrode current collectors commonly used in the art may also be used, and the thickness of the positive electrode current collector may be 1μm to 200μm. The positive electrode active material layer may be provided on one surface or two opposite surfaces of the positive electrode current collector. Further, in the thickness direction of the positive electrode tab, the positive electrode active material layer may be coated only on a partial area of the positive electrode current collector, and the thickness of the positive electrode active material layer may be 10μm to 500μm.

[0071] The positive electrode active material layer includes a positive electrode active material, and the positive electrode active material includes LiCoO2, LiNiO2, LiMn2O4, LiCo 1-y M y O2, LiNi 1-y M y O2, LiMn 2-y M y O4, LiNi x Co y Mn zM 1-x-y-z O2, where M is selected from at least one of Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V, or Ti, and 0 ≤ y ≤ 1, 0 ≤ x ≤ 1, 0 ≤ z ≤ 1, x + y + z ≤ 1. Exemplarily, the positive electrode active material may include at least one of lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium manganese iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, or lithium nickel manganese oxide. The above positive electrode active material may be subjected to doping and / or coating treatment. The positive electrode active material layer further includes a binder and a conductive agent. Exemplarily, the binder in the positive electrode active material layer may include at least one of polyvinylidene fluoride, copolymer of vinylidene fluoride - hexafluoropropylene, styrene - acrylate copolymer, styrene - butadiene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate salt, sodium carboxymethyl cellulose, polyvinyl acetate, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, or polyhexafluoropropylene; the conductive agent in the positive electrode active material layer may include at least one of conductive carbon black, acetylene black, Ketjen black, flake graphite, graphene, carbon nanotubes, or carbon fibers.

[0072] In some exemplary embodiments, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material layer provided on the surface of the negative electrode current collector. Exemplarily, the negative electrode current collector may be at least one of copper foil, aluminum foil, nickel foil, or a carbon - based current collector; the thickness of the negative electrode current collector may be 1 μm to 200 μm. The negative electrode active material layer may be provided on one surface or two opposite surfaces of the negative electrode current collector. Further, in the thickness direction of the negative electrode sheet, the negative electrode active material layer may be coated only on a partial area of the negative electrode current collector. Exemplarily, the thickness of the negative electrode active material layer may be 10 μm to 500 μm.

[0073] The negative electrode active material layer includes a negative electrode active material. Exemplarily, the negative electrode active material includes at least one of lithium metal, natural graphite, artificial graphite, or a silicon - based material. The silicon - based material includes at least one of silicon, silicon oxide compound, silicon carbide compound, or silicon alloy. The negative electrode active material layer may further include a conductive agent and / or a binder. Exemplarily, the conductive agent in the negative electrode active material layer may include at least one of carbon black, acetylene black, Ketjen black, flake graphite, graphene, carbon nanotubes, carbon fibers, or carbon nanowires; the binder in the negative electrode active material layer may include at least one of carboxymethyl cellulose CMC, polyacrylic acid, polyacrylate salt, polyacrylate, polyvinylpyrrolidone, polyaniline, polyimide, polyamideimide, polysiloxane, styrene - butadiene rubber, epoxy resin, polyester resin, polyurethane resin, or polyfluorene.

[0074] In some exemplary embodiments, the separator 143 includes at least one of polyethylene, polypropylene, polyvinylidene fluoride, polyethylene terephthalate, polyimide, or aramid. For example, polyethylene includes at least one selected from high-density polyethylene, low-density polyethylene, or ultra-high molecular weight polyethylene. In particular, polyethylene and polypropylene have a good effect on preventing short circuits and can improve the stability of the electrode assembly 140 through the shut-off effect. The thickness of the separator 143 ranges from about 3 μm to 500 μm.

[0075] In a second aspect, an embodiment of the present application provides an electronic device, which includes the battery in the first aspect.

[0076] Therefore, the electronic device in the second aspect has at least all the technical effects of the battery in the first aspect, and the specific technical effects are not elaborated herein again.

[0077] It should be noted that the embodiments of the present application only describe the structure of the electronic device in the second aspect related to the improvement points of the present application, but it does not mean that it does not have other structures. For example, the electronic device in the second aspect further includes a display assembly, a heat dissipation module, etc., and other structures are not elaborated herein one by one.

[0078] It should be understood that the electronic device may be, but is not limited to,

[0079] In particular, the term “and / or” in the present application should be understood as follows:

[0080] In the first case, the term “and / or” between the first main body and the second main body includes any of the following meanings: (1) only the first main body; (2) only the second main body; and (3) the first main body and the second main body.

[0081] In the second case, the term “and / or” between the last two of three or more main bodies means including at least any one of the multiple main bodies. For example, “the first main body, the second main body and / or the third main body” has the same meaning as “the first main body and / or the second main body and / or the third main body”, and specifically includes the following combinations: (1) only the first main body; (2) only the second main body; (3) only the third main body; (4) the first main body and the second main body without the third main body; (5) the first main body and the third main body without the second main body; (6) the second main body and the third main body without the first main body; and (7) the first main body, the second main body and the third main body;

[0082] In addition, the character “ / ” in the present application indicates that the objects before and after it have an “or” relationship.

[0083] Finally, although the above content describes the embodiments of the present application in conjunction with the accompanying drawings, those skilled in the art can still make various modifications and variations without departing from the concept of the present application. Such modifications and variations shall fall within the scope of protection of the present application.

Claims

1. A battery, characterized in that: The invention comprises a battery cell (10) and a circuit protection board (20); the battery cell (10) comprises an electrode assembly (140) and a shell (130); the electrode assembly (140) comprises a first pole ear (110) and a second pole ear (120) extending out of the shell (130); the shell (130) comprises a main body (131) and a top sealing edge (132) arranged at one end of the main body (131); the main body (131) has a head region (100); the head region (100) is provided with a protruding portion (101) and a recessed portion (102); the protruding portion (101) and the recessed portion (102) are arranged along a first direction; the top sealing edge (132) is located in the head region (100); The circuit protection board (20) comprises a substrate (210) and a first connecting piece (220) and a second connecting piece (230) respectively connected to the substrate (210); the substrate (210) is arranged in the recessed portion (102), the first connecting piece (220) is connected to the first pole lug (110), and the second connecting piece (230) is connected to the second pole lug (120).

2. The battery according to claim 1, characterized in that The top edge sealing portion (132) comprises a first edge sealing portion (1321) arranged corresponding to the raised portion (101) and a second edge sealing portion (1322) arranged corresponding to the recessed portion (102), wherein an edge of the first edge sealing portion (1321) is located on a side of the second edge sealing portion (1322) away from the main body portion (131); The first edge sealing portion (1321) is bent along the thickness direction of the battery; and / or at least a partial projection of the substrate (210) on the second edge sealing portion (1322) is located within the second edge sealing portion (1322); and / or the top surface of the protruding portion (101) exceeds the second edge sealing portion (1322).

3. The battery according to claim 2, characterized in that The shell (130) has a first side and a second side arranged opposite to each other along the first direction; the shell (130) includes a first side seal (133) arranged on the first side of the main body (131), the first side seal (133) is close to the protruding portion (101), and the first side seal (133) is bent along the thickness direction of the battery; a cutout (1301) is provided between the first side seal (1321) and the first side seal (133), and at least a part of the structure of the first side seal (1321) is bent along the thickness direction of the battery; And / or, the shell (130) includes a second side seal (134) provided on the second side of the main body (131), the second side seal (134) is close to the recessed portion (102), and the second side seal (134) is bent along the thickness direction of the battery; and the substrate (210) is located between the second side seal (134) and the side wall of the recessed portion (102) close to the raised portion (101).

4. The battery according to claim 3, characterized in that The incision (1301) is tilted, the incision angle of the incision (1301) is α, and satisfies 30°≤α≤60°; and / or the size of the incision (1301) is p, and satisfies p≥0.5mm.

5. The battery according to claim 1, characterized in that The first pole lug (110) and / or the second pole lug (120) are bent along the thickness direction of the battery, and the dimensions of the first pole lug (110) and the second pole lug (120) along the thickness direction of the battery are less than or equal to the thickness of the battery cell (10), and / or the first connecting piece (220) is located on a side surface of the first pole lug (110) facing away from the main body (131), and / or the connecting end of the second pole lug (120) is located on a side surface of the second connecting piece (230) facing away from the main body (131).

6. The battery according to claim 1, characterized in that The width of the protruding portion (101) is smaller than the width of the recessed portion (102), and / or the width w of the protruding portion (101) satisfies w≥10 mm, and / or the height difference h between the top surface of the protruding portion (101) and the recessed portion (102) satisfies h≥1 mm.

7. The battery according to claim 2, characterized in that The shell (130) further includes a connecting portion (103) located between the protruding portion (101) and the recessed portion (102), and a connecting edge sealing portion (1323) located between the first edge sealing portion (1321) and the second edge sealing portion (1322), and / or an angle β between the connecting edge sealing portion (1323) and the second edge sealing portion (1322) is satisfied, and 30°≤β≤60°, and / or a connecting end of the connecting edge sealing portion (1323) and the second edge sealing portion (1322) extends beyond the connecting portion (103) along the first direction.

8. The battery according to claim 1, characterized in that The first pole lug (110) is provided at the position of the protruding portion (101), and the second pole lug (120) is provided at the position of the recessed portion (102); or, the first pole lug (110) and the second pole lug (120) are provided at the position of the protruding portion (101); or, the first pole lug (110) and the second pole lug (120) are provided at the position of the recessed portion (102).

9. The battery according to any one of claims 1 to 8, characterized in that: The electrode assembly (140) comprises a plurality of first pole pieces (141), a plurality of diaphragms (143) and a plurality of second pole pieces (142) which are stacked; a first soft pole ear (1410) is formed on each of the plurality of first pole pieces (141), and the plurality of first soft pole ears (1410) are gathered together and connected to the first pole ear (110); a second soft pole ear (1420) is formed on each of the plurality of second pole pieces (142), and the plurality of second soft pole ears (1420) are gathered together and connected to the second pole ear (120); A groove (1401) is provided at a position corresponding to the first pole piece (141) and the second soft pole ear (1420), and / or a first notch (1402) is provided at a position where the first pole piece (141) and the first soft pole ear (1410) are connected, or the first pole piece (141) is provided with a cut corner (1404), and the first soft pole ear (1410) is connected to a position on the first pole piece (141) close to the cut corner (1404); And / or, a groove (1401) is provided at a position corresponding to the second pole piece (142) and the first soft pole ear (1410), and / or, a first notch (1402) is provided at a position where the second pole piece (142) and the second soft pole ear (1420) are connected, or the second soft pole ear (1420) is connected to a position on the second pole piece (142) close to the side of the second pole piece (142).

10. The battery according to claim 9, characterized in that The diaphragm (143) is provided with second notches (1403) at positions corresponding to the first soft pole ear (1410) and the second soft pole ear (1420), and the depth of the second notch (1403) is less than the depth of the first notch (1402); and / or the depth of the groove (1401) is d1, the depth of the first notch (1402) is d2, and d1≤3mm, and / or d2≤3mm.

11. An electronic device, characterized in that: A battery comprising any one of claims 1 to 10.

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