Battery and electronic device

Abstract

The utility model discloses a battery and electronic equipment. The battery comprises a battery module, the battery module comprises at least two battery cells arranged at intervals in a first direction, each battery cell comprises a main body part and an edge sealing part, and the main body part comprises two first end surfaces in the first direction, a second end surface at one end in a second direction and a chamfer surface, the chamfered surface is connected between the second end surface and the first end surface close to other battery cells, the edge sealing part comprises a top sealing edge, a side sealing edge and a chamfered sealing edge, the top sealing edge is connected to the second end surface, the side sealing edge is connected to the first end surface, and the chamfered sealing edge is connected to the chamfered surface; the protection plate is stacked on the second end face in the second direction and electrically connected with the battery module, the chamfered faces of the adjacent battery cells and the protection plate form a cavity, and the chamfered sealing edge, part of the top sealing edge and part of the side sealing edge are all located in the cavity.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a battery and electronic equipment. Background Art

[0002] One of the most common failure modes of dropped lithium-ion batteries is damage to the outer packaging film around the top seal after sustained impact. To address this issue, adhesive injection or folding of the top seal are commonly used to improve the impact resistance of the top seal area and prevent damage after a drop.

[0003] However, for batteries with dual-cell or multi-cell structure designs, the side seals and top seals of each cell will squeeze each other during the folding process to produce a bulge, and this bulge will increase the battery packaging length, resulting in a decrease in battery energy density. Utility Model Content

[0004] The embodiments of the present application provide a battery and an electronic device, which can solve the problem in the prior art that bulges generated by mutual squeezing during the folding process of the battery edge sealing may lead to a reduction in the battery energy density.

[0005] In the first aspect, an embodiment of the present application provides a battery, comprising: a battery module, comprising at least two battery cells spaced apart in a first direction, the battery cells comprising a main body and an edge sealing portion, the main body comprising two first end faces in the first direction, a second end face at one end in the second direction, and a chamfered surface, the chamfered surface being connected between the second end face and the first end face close to other battery cells, the edge sealing portion comprising a top edge sealing portion, a side edge sealing portion and a chamfered edge sealing portion, the top edge sealing portion being connected to the second end face, the side edge sealing portion being connected to the first end face, and the chamfered edge sealing portion being connected to the chamfered surface; a protective plate, stacked on the second end face along the second direction and electrically connected to the battery module, wherein the chamfered surfaces of adjacent battery cells and the protective plate form a cavity, and the chamfered edge sealing portion, part of the top edge sealing portion and part of the side edge sealing portion are all located in the cavity.

[0006] In a second aspect, an embodiment of the present application provides an electronic device comprising the battery of the embodiment of the first aspect described above.

[0007] In this way, in the battery and electronic device provided in the embodiments of the present application, the battery includes a battery module and a protective plate, the battery module includes at least two battery cells spaced apart in a first direction, the battery cell includes a main body and a sealing portion, the main body is used to generate an electrochemical reaction to generate current, and the sealing portion is used to seal the main body to prevent leakage of the battery cell, the main body includes two first end faces in the first direction, a second end face at one end in the second direction, and a chamfered surface connected to the second end face and the first end face close to other battery cells, the sealing portion includes a top sealing portion, a side sealing portion and a chamfered sealing portion, the top sealing portion is connected to the second end face, the side sealing portion is connected to the first end face, and the chamfered sealing portion is connected to the chamfered surface, the protective plate is electrically connected to the battery module, the protective plate plays a role in managing and protecting the battery module, the protective plate is stacked on the second end face along the second direction, the chamfered surfaces of adjacent battery cells and the protective plate form a cavity, and the chamfered sealing portion, part of the top sealing portion and part of the side sealing portion are all located in the cavity.

[0008] Therefore, in the embodiment of the present application, a chamfered surface is formed on the battery cell to form a cavity formed by the chamfered surface and the protective plate in the battery module. The chamfered edge seal, part of the top edge seal and part of the side edge seal are all located in the cavity. Then, part of the protrusion generated during the folding process of the edge seal will be accommodated in the cavity to reduce the protrusion degree of the edge seal protruding from the second end surface, to reduce the gap size between the protective plate and the second end surface, to reduce the overall size of the battery module, and to improve the battery energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0010] Figure 1 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0011] Figure 2 Schematic diagram of the battery cell structure of some embodiments of the present application;

[0012] Figure 3 Schematic diagram of the battery cell structure of some embodiments of the present application;

[0013] Figure 4 Schematic diagrams of the structures of batteries in other embodiments of the present application;

[0014] Figure 5 Schematic diagrams of the structures of batteries in other embodiments of the present application;

[0015] Figure 6 Schematic diagrams of the structures of battery cells of other embodiments of the present application;

[0016] Figure 7 This is a schematic structural diagram of an electrode assembly of a battery according to some embodiments of the present application;

[0017] Figure 8 This is a schematic structural diagram of a first electrode of a battery according to some embodiments of the present application;

[0018] Figure 9 This is a schematic structural diagram of the second electrode of a battery according to some embodiments of the present application;

[0019] Figure 10 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0020] Figure 11 This is a schematic structural diagram of a battery according to some embodiments of the present application.

[0021] Description of Figure Numbers:

[0022] 100. Battery;

[0023] 200, protection plate;

[0024] 300, battery module; 310, battery cell; 320, main body; 330, edge sealing; 321, first end face; 322, second end face; 323, chamfered surface; 331, top edge seal; 332, side edge seal; 333, chamfered edge seal; 3321, first edge seal; 3322, second edge seal; 340, electrode assembly; 350, plastic film; 361, electrode body; 362, tab; 341, chamfered surface; 342, first pole piece; 3421, opening; 343, second pole piece; 3431, first edge; 3432, second edge; 3433, chamfered edge;

[0025] 400 , chamber; 410 , temperature sensor; 420 , support member; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0026] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0028] In the description of this application, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "center", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a battery in some embodiments of the present application; Figure 2 Schematic diagram of the battery cell structure of some embodiments of the present application.

[0031] First, as Figure 1 and Figure 2As shown, an embodiment of the present application provides a battery 100, which includes a battery module 300 and a protective plate 200. The battery module 300 includes at least two battery cells 310 spaced apart in a first direction X. The battery cell 310 includes a main body 320 and an edge sealing portion 330. The main body 320 includes two first end surfaces 321 in the first direction X, a second end surface 322 at one end in the second direction Y, and a chamfered surface 323. The chamfered surface 323 is connected between the second end surface 322 and the first end surface 321 close to the other battery cells 310. The edge sealing portion 330 includes a top edge sealing portion 331, a side edge sealing portion 332 and a chamfered edge sealing portion 333, the top edge sealing portion 331 is connected to the second end face 322, the side edge sealing portion 332 is connected to the first end face 321, and the chamfered edge sealing portion 333 is connected to the chamfered surface 323; the protective plate 200 is stacked on the second end face 322 along the second direction Y and is electrically connected to the battery module 300, wherein the chamfered surfaces 323 of adjacent battery cells 310 and the protective plate 200 form a cavity 400, and the chamfered edge sealing portion 333, part of the top edge sealing portion 331 and part of the side edge sealing portion 332 are all located in the cavity 400.

[0032] Thus, in the battery 100 and the electronic device provided in the embodiment of the present application, the battery 100 includes a battery module 300 and a protective plate 200, the battery module 300 includes at least two battery cells 310 spaced apart in a first direction X, the battery cell 310 includes a main body 320 and a sealing edge 330, the main body 320 is used to generate an electrochemical reaction to generate current, the sealing edge 330 is used to seal the main body 320 to prevent the battery cell 310 from leaking, the main body 320 includes two first end faces 321 in the first direction X, a second end face 322 at one end in the second direction Y, and a first end face 321 connected to the second end face 322 and close to other battery cells 310. The chamfered surface 323, the edge sealing portion 330 includes a top edge sealing 331, a side edge sealing 332 and a chamfered edge sealing 333, the top edge sealing 331 is connected to the second end face 322, the side edge sealing 332 is connected to the first end face 321, the chamfered edge sealing 333 is connected to the chamfered surface 323, the protection plate 200 is electrically connected to the battery module 300, the protection plate 200 plays a role in managing and protecting the battery module 300, the protection plate 200 is stacked on the second end face 322 along the second direction Y, the chamfered surfaces 323 of adjacent battery cells 310 and the protection plate 200 form a cavity 400, the chamfered edge sealing 333, part of the top edge sealing 331 and part of the side edge sealing 332 are all located in the cavity 400. By forming a chamfered surface 323 on the battery cell 310, a cavity 400 formed by the chamfered surface 323 and the protective plate 200 is formed in the battery module 300. The chamfered edge seal 333, part of the top edge seal 331 and part of the side edge seal 332 are all located in the cavity 400. Then, part of the protrusion generated during the folding process of the edge seal portion 330 will be accommodated in the cavity 400, so as to reduce the protrusion degree of the edge seal portion 330 protruding from the second end surface 322, so as to reduce the gap size between the protective plate 200 and the second end surface 322, so as to reduce the overall size of the battery module 300 and improve the energy density of the battery 100.

[0033] The battery module 300 includes at least two battery cells 310 arranged along the second direction Y. The number of battery cells 310 can be set arbitrarily, and the battery cells 310 can be connected in parallel or in series.

[0034] The battery cell 310 is a soft-pack battery cell, which includes a main body 320 and a sealing edge 330. An electrode assembly 340 is provided in the main body 320 to perform an electrochemical reaction to generate current. The sealing edge 330 is used to seal the main body 320 to prevent the battery cell 310 from leaking.

[0035] In the preparation process of the battery cell 310 in the related technology, the edge sealing portion 330 is wrapped around the outer peripheral surface of the main body 320 and extends away from the main body 320. The maximum circumference of the edge sealing portion 330 is greater than the circumference of the main body 320. During the folding process of the edge sealing portion 330, the edge sealing portion 330 is bent toward the main body 320 along the crease line at the connection between the edge sealing portion 330 and the main body 320. During the bending process, the edge sealing portions 330 at the corner positions are squeezed against each other to form bulges, and usually two bulges are formed in the width direction of the battery cell 310. When the battery module 300 includes one battery cell 310, the protective plate 200 can be located between the two protrusions, and the two protrusions will not interfere with the protective plate 200; when the battery module 300 includes multiple battery cells 310, when the protective plate 200 is installed, some of the protrusions will be squeezed between the protective plate 200 and the main body 320, resulting in an increase in the distance between the protective plate 200 and the main body 320, an increase in the overall size of the battery 100, a decrease in the energy density of the battery 100, and the protrusions squeezed between the protective plate 200 and the main body 320 can easily pierce the main body 320 and cause leakage.

[0036] In an embodiment of the present application, the main body 320 forms a chamfered surface 323 between the second end face 322 and at least one first end face 321, so that when the protective plate 200 is installed, the protective plate 200 and the cavity 400 formed by the two chamfered surfaces 323 can accommodate the edge sealing portion 330. In this way, even if the edge sealing portion 330 is squeezed to form a protrusion, at least part of the protrusion can be accommodated in the cavity 400, thereby reducing the interference of the protrusion on the protective plate 200.

[0037] The battery cell 310 can be in a cubic shape. The main body 320 also includes a third end surface disposed opposite the second end surface 322. The third end surface is larger than the first end surface 321 in the first direction X. The first end surface 321 includes a first sub-end surface facing other battery cells 310 and a second sub-end surface facing away from other battery cells 310. The first sub-end surface is smaller than the second sub-end surface in the second direction Y. The battery cell 310 can have one or two chamfered surfaces 323.

[0038] The chamfered edge 333 is connected to the chamfered surface 323 to reduce the risk of liquid leakage of the main body 320 at the chamfered surface 323 .

[0039] The top sealing edge 331 extends along the first direction X, and a portion of its edge on one side in the second direction Y is connected to the second end surface 322 , while another portion of its edge is flush with the first end surface 321 and at least partially connected to the chamfered sealing edge 333 along the second direction Y.

[0040] The side sealing edge 332 extends along the second direction Y, and a portion of the edge of the side sealing edge 332 on the side close to the other battery cells 310 on the side in the first direction X is connected to the first end face 321, and another portion of the edge is flush with the second end face 322 and is at least partially connected to the chamfered edge 333 along the first direction X.

[0041] The chamfered edge sealing 333 is connected between the chamfered surface 323 , the top edge sealing 331 and the side edge sealing 332 , and the chamfered edge sealing 333 does not extend beyond the first end surface 321 and the second end surface 322 .

[0042] The top sealing edge 331 , the side sealing edge 332 and the chamfered sealing edge 333 are integrally formed to enhance the sealing effect of the sealing edge portion 330 on the main body portion 320 .

[0043] Optionally, the shapes of the top sealing edge 331 , the side sealing edge 332 and the chamfered sealing edge 333 can be set arbitrarily. For example, the top sealing edge 331 and the side sealing edge 332 are rectangular, and the chamfered sealing edge 333 is triangular.

[0044] The chamfered surface 323 is connected between the end of the second end surface 322 facing the other battery cells 310 and the end of the first sub-end surface facing the second end surface 322. The orthographic projection of the end connecting the second end surface 322 and the chamfered surface 323 in the second direction Y is located within the third end surface, and the orthographic projection of the end connecting the first sub-end surface and the chamfered surface 323 in the first direction X is located within the second sub-end surface. Furthermore, with the midpoint of the third end surface in the first direction X as the first endpoint and the midpoint of the second sub-end surface in the second direction Y as the second endpoint, the maximum dimension from the chamfered surface 323 to the first endpoint in the first direction X is smaller than the dimension from the first end surface 321 to the first endpoint, and the maximum dimension from the chamfered surface 323 to the second endpoint in the second direction Y is smaller than the dimension from the second end surface 322 to the second endpoint.

[0045] The specific shape of the chamfered surface 323 can be set by oneself. The chamfered surface 323 can be a plane, a curved surface, a wavy surface, etc. For example, the chamfered surface 323 is a plane extending in the second direction Y and inclined toward other battery cells 310. The planar chamfered surface 323 can reduce the processing difficulty of the battery cell 310.

[0046] Optionally, the protection plate 200 and the second end surface 322 are stacked. Specifically, one side surface of the protection plate 200 in the thickness direction is arranged toward the second end surface 322 to reduce the overall size of the battery 100 and improve the energy density of the battery 100.

[0047] Optionally, the protection plate 200 is bonded and fixed to the battery module 300 to improve the connection reliability between the protection plate 200 and the battery module 300 .

[0048] See also Figure 3 , Figure 3Schematic diagram of the battery cell structure of some embodiments of the present application.

[0049] In some embodiments, as Figures 1 to 3 As shown, the two side sealing edges 332 are respectively connected to the two ends of the top sealing edge 331 in the first direction X, and part of the top sealing edge 331 and part of the side sealing edges 332 facing other battery cells 310 are accommodated in the cavity 400 .

[0050] In these embodiments, the two side seals 332 are respectively connected to the two ends of the top seal 331 in the first direction X, and part of the top seal 331 and part of the side seal 332 facing other battery cells 310 are accommodated in the cavity 400 to improve the problem of reduced energy density of the battery 100 caused by interference between the bulge formed by the folding of the seal portion 330 and the protective plate 200.

[0051] Figure 3 The state of the battery cell 310 after packaging is shown. The two side sealing edges 332 are respectively connected to the two ends of the top sealing edge 331 in the first direction X. Figure 2 The folded edge sealing portion 330, the chamfered edge sealing 333, the top edge sealing 331 and the side edge sealing 332 are folded toward the main body 320 along the fold at the intersection with the main body 320. A folding protrusion is formed at the junction of the chamfered edge sealing 333 and the top edge sealing 331 and the chamfered edge sealing 333 and the side edge sealing 332, and this part of the folding protrusion is bent toward the chamfered surface 323.

[0052] like Figure 1 As shown, after the protection plate 200 is installed, this portion of the folded protrusion is located in the cavity 400 without interfering with the protection plate 200 .

[0053] Optionally, folded protrusions may be formed at the junctions between the chamfered edge seal 333 and the top edge seal 331 , and between the chamfered edge seal 333 and the side edge seal 332 , and the protrusions may be bent toward the chamfered surface 323 and adhered to the chamfered surface 323 .

[0054] Optionally, the portion of the top seal 331 contained within the cavity 400 is bonded to the protective plate 200 to prevent the folded portion of the top seal 331 within the cavity 400 from puncturing the chamfered surface 323 and causing leakage from the main body 320. Similarly, the portion of the side seal 332 contained within the cavity 400 can be bonded to the adjacent battery cell 310.

[0055] See also Figure 4 、 Figure 5 and Figure 6 , Figure 4 Schematic diagrams of the structures of batteries in other embodiments of the present application; Figure 5 Schematic diagrams of the structures of batteries in other embodiments of the present application; Figure 6 Schematic diagram of the structure of battery cells according to other embodiments of the present application.

[0056] In some embodiments, as Figures 4 to 6 As shown, the side sealing edge 332 includes a first sealing edge 3321 facing away from other battery cells 310 and a second sealing edge 3322 facing other battery cells 310, the first sealing edge 3321 is connected to the top sealing edge 331, and the end of the top sealing edge 331 close to the second sealing edge 3322 does not exceed the first end surface 321, and the end of the second sealing edge 3322 close to the top sealing edge 331 does not exceed the second end surface 322.

[0057] In these embodiments, the side seal 332 includes a first seal 3321 facing away from other battery cells 310 and a second seal 3322 facing other battery cells 310. The first seal 3321 and the top seal 331 are connected to maintain the sealing reliability of the seal portion 330 to the main body 320. The end of the top seal 331 close to the second seal 3322 does not exceed the first end surface 321, and the end of the second seal 3322 close to the top seal 331 does not exceed the second end surface 322. In this way, during the folding process of the seal portion 330, the top seal 331 and the second seal 3322 are spaced apart, and no folding protrusion will be generated between the two, nor will they interfere with the protective plate 200, and the folding process during the preparation of the battery cell 310 can be simplified.

[0058] The battery cell 310 may include a first edge seal 3321 and a second edge seal 3322 , or the battery cell 310 may include only two second edge seals 3322 .

[0059] Specifically, during the preparation of the battery cell 310, as Figure 6 As shown, after forming the edge seal 330, a portion of the edge seal 330 is cut away to form a top edge seal 331 and a second edge seal 3322 of appropriate size. The top edge seal 331 and the second edge seal 3322 are then folded. During the folding process of the edge seal 330, the top edge seal 331 is bent along the fold at the junction with the second end surface 322, and the side edge seal 332 is bent along the fold at the junction with the first end surface 321. The chamfered edge seal 333 does not need to be bent. Since the top edge seal 331 and the second edge seal 3322 are spaced apart, no bulge will be generated between the top edge seal 331 and the second edge seal 3322 during the folding process. Furthermore, since the chamfered edge seal 333 exists on the chamfered surface 323, even if the top edge seal 331 and the second seal are disconnected, there will be no leakage at the chamfered surface 323.

[0060] Optionally, the top sealing edge 331 is flush with the first end surface 321 , and the second sealing edge 3322 is flush with the second end surface 322 , so as to extend the connection length between the top sealing edge 331 and the chamfered sealing edge 333 , and to extend the connection length between the second sealing edge 3322 and the chamfered sealing edge 333 .

[0061] It should be made clear that Figure 4In order to conveniently indicate the status of the main body of adjacent battery cells, the distance between two adjacent battery cells is increased. In actual use, the two battery cells can be placed together.

[0062] See also Figure 7 , Figure 7 Schematic diagram of the structure of the electrode assembly of the battery of some embodiments of the present application.

[0063] In some embodiments, as Figure 6 and Figure 7 As shown, the battery cell 310 includes an electrode assembly 340 and a plastic film 350. The plastic film 350 is covered on the outer surface of the electrode assembly 340. A chamfered surface 341 is formed between the end surface of one side of the electrode assembly 340 in the second direction Y and the end surface of one side facing other battery cells 310 in the first direction X. The plastic film 350 covers the chamfered surface 341 to form a chamfered surface 323.

[0064] In these embodiments, the battery cell 310 includes an electrode assembly 340 and a plastic film 350. The plastic film 350 is covered on the outer surface of the electrode assembly 340 to accommodate and protect the electrode assembly 340. A chamfered surface 341 is formed between the end surface of one side of the electrode assembly 340 in the second direction Y and the end surface of one side facing other battery cells 310 in the first direction X. By forming the chamfered surface 341 on the electrode assembly 340, a chamfered surface 323 is formed after covering with the plastic film 350. The structure is simple, no additional components are required, and the reliability of the battery cell 310 is improved.

[0065] The electrode assembly 340 is located between the folded plastic film 350. The plastic film 350 on both sides of the electrode assembly 340 in the thickness direction is hot-pressed together. The electrode assembly 340 includes an interconnected electrode body 361 and a tab 362. The electrochemical reaction occurs in the electrode body 361. The tab 362 extends from the edge seal 330 and is electrically connected to the protective plate 200.

[0066] A portion of the plastic film 350 is wrapped around the outer surface of the electrode body to form the main body portion 320 , and another portion of the plastic film 350 extends out of the electrode body 361 and is connected to form the edge sealing portion 330 .

[0067] Part of the plastic film 350 covers the chamfered surface 341 to form the chamfered surface 323. The shape of the chamfered surface 341 matches the shape of the chamfered surface 323. For example, when the chamfered surface 341 is an inclined plane, the chamfered surface 323 is also an inclined plane; when the chamfered surface 341 is a curved surface, the chamfered surface 323 is also a curved surface.

[0068] Optionally, the electrode assembly 340 is formed by winding or stacking pole pieces, the pole pieces include a current collector and an active material layer, the current collector includes a current collecting portion and a pole ear 362, the active material layer is arranged on the current collecting portion, and the current collecting portion is wound or stacked to form an electrode body 361.

[0069] In other embodiments, the electrode assembly 340 is rectangular, and a bracket is provided between the electrode assembly 340 and the chamfered surface 323. The plastic film 350 covers the bracket to form the chamfered surface 323. By setting brackets of different sizes, the size of the chamfered surface 323 of the battery cell 310 can be conveniently adjusted.

[0070] See also Figure 8 , Figure 8 This is a schematic structural diagram of the first electrode of a battery in some embodiments of the present application.

[0071] In some embodiments, as Figures 6 to 8 As shown, the electrode assembly 340 is formed by winding a first electrode piece 342, and a plurality of openings 3421 are arranged at intervals on the first electrode piece 342 in its extension direction. The opening 3421 extends from one side edge of the first electrode piece 342 in the second direction Y toward the other side, and its size in the first direction X gradually decreases in its extension direction, and the cut angle surface 341 is formed by the opening 3421.

[0072] In these embodiments, an opening 3421 is formed on the first electrode sheet 342 so that after the first electrode sheet 342 is wound into the electrode assembly 340, the opening 3421 can form a chamfered surface 341 of the electrode assembly 340, and a chamfered surface 323 is formed after covering the plastic film 350, and the cavity 400 formed by the chamfered surface 323 accommodates part of the edge sealing portion 330 to improve the energy density of the battery 100.

[0073] The two first electrode sheets 342 are respectively the positive electrode sheet and the negative electrode sheet. The first electrode sheets 342 are in the form of strips. The two first electrode sheets 342 are stacked and wound at least two times to form the electrode assembly 340. When preparing the electrode assembly 340, the electrode assembly 340 can be first wound into a hollow cylindrical structure and then extruded into a flat shape. A separator is also included between the two first electrode sheets 342. Openings 3421 are provided in the positive electrode sheet, separator, and negative electrode sheet, respectively, so that the openings 3421 overlap with each other during the winding process.

[0074] The specific shape of the opening 3421 matches the shape of the cut-angle surface 341. During the winding process of the first pole piece 342, the opening 3421 forms a cut-angle surface 341 on both side edges of the extension direction of the first pole piece 342. The size of the opening 3421 in the second direction Y is also the size of the cut-angle surface 341 in the second direction Y.

[0075] For example, when the angled surface 341 is an inclined plane, the two side edges of the opening 3421 in the extension direction of the first pole piece 342 also extend along an inclined straight path; when the angled surface 341 is an inclined curved surface, the two side edges of the opening 3421 in the extension direction of the first pole piece 342 also extend along an inclined arc path.

[0076] See also Figure 9 , Figure 9 This is a schematic structural diagram of the second electrode of a battery in some embodiments of the present application.

[0077] In some embodiments, as Figure 6 、 Figure 7 and Figure 9 As shown, the electrode assembly 340 is formed by stacking several second pole pieces 343 in the thickness direction thereof, and the second pole piece 343 includes a first edge 3431, a second edge 3432 and a chamfered edge 3433. The first edge 3431 is located on the side of the second pole piece 343 close to the other battery cells 310 in the first direction X, and the second edge 3432 is located at one end of the second pole piece 343 in the second direction Y. The chamfered edge 3433 is connected between the first edge 3431 and the second edge 3432, and the chamfered surface 341 is formed by several chamfered edges 3433.

[0078] In these embodiments, by forming a chamfered edge 3433 on the second pole piece 343, when multiple second pole pieces 343 are stacked to form an electrode assembly 340, the multiple chamfered edges 3433 are combined to form a chamfered surface 341, and a chamfered surface 323 is formed after covering the plastic film 350, and the cavity 400 formed by the chamfered surface 323 accommodates part of the edge sealing portion 330 to improve the energy density of the battery 100.

[0079] The second electrode sheet 343 includes a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet have the same shape and size. The electrode assembly 340 also includes a separator positioned between the positive electrode sheet and the negative electrode sheet. The separator is provided with a chamfered edge 3433 corresponding to the second electrode sheet 343. The positive electrode sheet, separator, and negative electrode sheet are stacked in sequence to form the electrode assembly 340. The plurality of second electrode sheets 343 and the chamfered edges 3433 of the separator are combined to form a chamfered surface 341.

[0080] The dimension of the chamfered edge 3433 in the second direction Y is the same as the dimension of the chamfered surface 341 in the second direction Y. The shape of the chamfered edge 3433 matches the shape of the chamfered surface 341. For example, when the chamfered surface 341 is an inclined plane, the chamfered edge 3433 extends along an inclined straight path. When the chamfered surface 341 is an arcuate surface, the chamfered edge 3433 extends along an arcuate path.

[0081] In some embodiments, as Figure 6As shown, a dimension L1 of the chamfered surface 323 in the first direction X and a dimension L2 of the chamfered surface 323 in the second direction Y satisfy L1 ≥ 0.5 mm and L2 ≥ 0.5 mm.

[0082] In these embodiments, when the chamfered surface 323 meets the above-mentioned dimensions, the chamfered edge 333 will not be too small due to the chamfered surface 323 being too small, thereby reducing the sealing reliability of the chamfered surface 323, nor will the electrode assembly 340 be too small due to the chamfered surface 323 being too large, thereby reducing the capacity of the battery 100.

[0083] For example, the size of the chamfered surface 323 in the first direction X is 2 mm, and the size of the chamfered surface 323 in the second direction Y is 1 mm; or the size of the chamfered surface 323 in the first direction X is 1 mm, and the size of the chamfered surface 323 in the second direction Y is 0.5 mm.

[0084] For example, taking the battery cell 310 with a thickness of 5.2mm, a first direction X dimension of 33mm, and a second direction Y dimension of 85mm as an example, in the related art, the height of the folded protrusion of the edge sealing portion 330 is 1mm. The battery energy density loss in the related art is 1 / 85 = 1.17%. In the embodiment of the present application, the dimension of the chamfered surface 323 in the first direction X is 1mm, the dimension of the chamfered surface 323 in the second direction Y is 0.5mm, and the pole piece loss area at the cut surface 341 is 1*0.5*26 layers = 13mm 2 , total pole piece area 63200mm 2 , energy density loss 13 / 63200=0.02%, compared with the packaging method of the existing technology, energy density is increased by 1.15%.

[0085] See also Figure 10 , Figure 10 This is a schematic structural diagram of a battery according to some embodiments of the present application.

[0086] In some embodiments, as Figure 10 As shown, the battery 100 further includes a temperature sensor 410 . The temperature sensor 410 is disposed in the chamber 400 . The temperature sensor 410 is used to obtain temperature information of the battery module 300 .

[0087] In these embodiments, the temperature sensor 410 is disposed in the chamber 400 to reasonably utilize the space of the battery 100 . The temperature sensor 410 is used to obtain temperature information of the battery module 300 to improve the reliability of the battery 100 .

[0088] Optionally, part of the protection plate 200 is accommodated in the cavity 400 after being installed in the battery module 300 to reduce the overall size of the battery 100 .

[0089] Optionally, the temperature sensor 410 is bonded or clamped into the chamber 400 to maintain the stability of the temperature sensor 410 .

[0090] See also Figure 11 , Figure 11 This is a schematic structural diagram of a battery according to some embodiments of the present application.

[0091] In some embodiments, as Figure 1 and Figure 11 As shown, the battery 100 further includes a support member 420 , one end of the support member 420 is located in the cavity 400 , and the other end thereof extends out of the cavity 400 along the thickness direction of the battery module 300 .

[0092] In these embodiments, one end of the support member 420 is located in the cavity 400, and the other end thereof extends out of the cavity 400 along the thickness direction of the battery module 300, so as to improve the problem that when the battery 100 is assembled into an electronic device, the device shell squeezes the battery 100, causing damage to the battery 100.

[0093] Optionally, the support member 420 is bonded to the chamber 400 . The support member 420 is formed by solidifying the colloid poured into the chamber 400 , thereby improving the stability of the support member 420 .

[0094] Optionally, the support member 420 is an elastic member to improve the buffering performance of the support member 420 .

[0095] In a second aspect, an embodiment of the present application provides an electronic device comprising the battery of the embodiment of the first aspect described above.

[0096] Since the electronic device provided in the second embodiment of the present application includes the battery of any one of the first embodiments above, the electronic device provided in the second embodiment of the present application has the beneficial effects of the battery of any one of the first embodiments above, which will not be repeated here.

[0097] The electronic devices in the embodiments of the present application include, but are not limited to, mobile phones, personal digital assistants (PDAs), tablet computers, laptops, televisions, driving recorders, and other devices with batteries.

[0098] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A battery, characterized in that: include: A battery module, comprising at least two battery cells spaced apart in a first direction, the battery cells comprising a main body and an edge seal, the main body comprising two first end surfaces in the first direction, a second end surface at one end in the second direction, and a chamfered surface, the chamfered surface being connected between the second end surface and the first end surface adjacent to other battery cells, the edge seal comprising a top edge seal, a side edge seal, and a chamfered edge seal, the top edge seal being connected to the second end surface, the side edge seal being connected to the first end surface, and the chamfered edge seal being connected to the chamfered surface; a protection plate, stacked on the second end surface along the second direction and electrically connected to the battery module, The chamfered surfaces of the adjacent battery cells and the protection plate form a cavity, and the chamfered edge seal, part of the top edge seal and part of the side edge seal are all located in the cavity.

2. The battery according to claim 1, characterized in that The two side seals are respectively connected to two ends of the top seal in the first direction, and a portion of the top seal and a portion of the side seal facing the other battery cells are accommodated in the cavity.

3. The battery according to claim 1, characterized in that The side seal includes a first seal facing away from the other battery cells and a second seal facing the other battery cells. The first seal is connected to the top seal, and an end of the top seal close to the second seal does not exceed the first end surface, and an end of the second seal close to the top seal does not exceed the second end surface.

4. The battery according to claim 1, characterized in that The battery cell comprises an electrode assembly and a plastic film, wherein the plastic film is coated on the outer surface of the electrode assembly. A chamfered surface is formed between the end surface of the electrode assembly on one side in the second direction and the end surface on one side facing other battery cells in the first direction, and the plastic film covers the chamfered surface to form the chamfered surface.

5. The battery according to claim 4, characterized in that The electrode assembly is formed by winding a first electrode sheet, and a plurality of openings are arranged on the first electrode sheet at intervals in its extension direction. The openings extend from one side edge of the first electrode sheet in the second direction toward the other side, and their dimensions in the first direction gradually decrease in the extension direction. The cut angle surface is formed by the openings.

6. The battery according to claim 4, characterized in that The electrode assembly is formed by stacking several second pole pieces in the thickness direction, and the second pole piece includes a first edge, a second edge and a chamfered edge. The first edge is located on the side of the second pole piece close to other battery cells in the first direction, and the second edge is located at one end of the second pole piece in the second direction. The chamfered edge is connected between the first edge and the second edge, and the chamfered surface is formed by several of the chamfered edges.

7. The battery according to claim 1, characterized in that A dimension L1 of the chamfered surface in the first direction and a dimension L2 of the chamfered surface in the second direction satisfy L1 ≥ 0.5 mm and L2 ≥ 0.5 mm.

8. The battery according to claim 1, characterized in that The battery further includes a temperature sensor, which is disposed in the chamber and is used to obtain temperature information of the battery module.

9. The battery according to claim 1, characterized in that The battery further includes a support member, one end of which is located in the cavity, and the other end of which extends out of the cavity along the thickness direction of the battery module.

10. An electronic device, characterized in that: A battery comprising any one of claims 1 to 9.

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