Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment. The battery comprises a battery cell body which is provided with a first end face and a second end face which are oppositely arranged; the packaging shell comprises a containing part and a sealing edge connected with the containing part, the battery cell body is located in the containing part, the sealing edge is located outside the containing part, the containing part comprises a first containing unit wrapping the first end face and a second containing unit wrapping the second end face, and a groove is formed in the end, away from the second containing unit, of the first containing unit; and the sealing edge is bent and extends into the groove. According to the battery, the size of the sealing edge in the first direction can be reduced, so that the size of the thickness of the sealing edge exceeding the battery cell body can be reduced, even the thickness of the sealing edge exceeding the battery cell body can be avoided, and the energy density and the safety performance of the soft package battery are further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrochemical energy storage devices, in particular to a battery and an electronic device. BACKGROUND

[0002] With the rapid development of communication networks, the application scenarios of electronic products are becoming more and more extensive. As users increasingly demand lightweight electronic products, the design of lightweight batteries for electronic products is also becoming more and more demanding.

[0003] Therefore, soft package batteries are gradually widely used due to their lightweight and customizable size. The soft package battery usually uses a packaging shell to package the battery core body. However, the energy density and safety performance of the soft package battery in the related art need to be further improved. UTILITY MODEL CONTENT

[0004] The present application provides a battery and an electronic device, aiming to improve the energy density and safety performance of the battery.

[0005] In a first aspect, a battery is provided, comprising: a battery core body having a first end face and a second end face arranged opposite to each other; a packaging shell comprising a receiving portion and an edge connected to the receiving portion, the battery core body being located in the receiving portion, the edge being located outside the receiving portion, the receiving portion comprising a first receiving unit wrapping the first end face and a second receiving unit wrapping the second end face, one end of the first receiving unit away from the second receiving unit being provided with a groove, and the edge being bent and extended to the groove.

[0006] Optionally, the battery core body has a side wall connecting the first end face and the second end face, the side wall being provided with a recessed area at a connection with the first end face, and the recessed area corresponding to the groove.

[0007] Optionally, the edge comprises a first folded edge portion located in the groove, a projection of the first folded edge portion in a first direction being located on the receiving portion, and the first direction being parallel to a direction from the first end face to the second end face.

[0008] Optionally, a size of the edge in the first direction is less than or equal to a size of the receiving portion in the first direction.

[0009] Optionally, a size of the groove in the first direction ranges from 5% to 50% of the size of the receiving portion in the first direction.

[0010] Optionally, the side wall comprises a first side wall and a second side wall arranged opposite to each other, the recessed area being provided on both the first side wall and the second side wall, and a size of the recessed area in the second direction being 1% to 10% of a size of the second end face in the second direction.

[0011] Optionally, the first folding part comprises a first fold, a first bending part and a second fold, the first bending part connects the first fold and the second fold, and an end of the second fold forms an end of the sealing edge, and the distance between the end of the sealing edge and the side wall of the groove in the second direction is greater than or equal to 0.3 mm.

[0012] Optionally, the number of layers of the encapsulation layer included in the sealing edge is an even multiple of the number of layers of the encapsulation layer included in the accommodating part.

[0013] Optionally, the groove comprises a bonding layer, and the first folding part is fixedly connected with the bonding layer.

[0014] Optionally, the bonding layer covers the end surface of the first folding part.

[0015] Optionally, the first bending part and the second fold of the first folding part are fixedly connected with the bonding layer.

[0016] Optionally, the cell body corresponding to the recessed area in the first direction is flush with the groove in the first direction, the cell body corresponding to the recessed area in the first direction comprises a first pole piece and a second pole piece, and the sum of the number of layers of the first pole piece and the second pole piece in the cell body corresponding to the recessed area in the first direction is greater than or equal to 2.

[0017] In a second aspect, an electronic device is provided, comprising the battery of the first aspect.

[0018] The accommodating part for wrapping the cell body in the packaging shell of the battery provided by the embodiments of the present application is provided with a groove, which can allow the sealing edge connected with the accommodating part to bend and extend into the groove, thereby reducing the size of the sealing edge in the first direction, further reducing the thickness of the sealing edge beyond the cell body, and even avoiding the sealing edge beyond the cell body, thereby further improving the energy density and safety performance of the soft package battery. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a battery in the related art.

[0020] Figure 2 It is a structural schematic diagram of a battery provided by the embodiments of the present application.

[0021] Figure 3 It is a structural schematic diagram of a battery formed by the sealing edge in the bending Figure 2

[0022] Figure 4 It is a structural schematic diagram of a battery provided by another embodiment of the present application.​

[0023] Figure 5 A structural schematic diagram of a battery is provided for an embodiment of the present application.

[0024] Figure 6 A structural schematic diagram of a battery is provided for another embodiment of the present application.

[0025] Reference signs: battery 100, cell body 110, first end face 111, second end face 112, packaging shell 120, accommodating portion 121, edge 122, end portion M of the edge; battery 400, cell body 410, first end face 411, second end face 412, side wall 413, first side wall 4131, second side wall 4132, packaging shell 420, accommodating portion 421, edge 422, first accommodating unit 423, second accommodating unit 424, groove 425, first group of packaging layers X, second group of packaging layers Y, recessed area 426, non-recessed area 427, first edge folding portion 428, second edge folding portion 429, first edge 430, first bending portion 431, second edge 432, adhesive layer 433, second bending portion 434, third edge 435, and third bending portion 436. DETAILED DESCRIPTION

[0026] In order to facilitate understanding of the present application, the present application will be described in more detail below based on exemplary embodiments and in conjunction with the accompanying drawings. The same or similar reference signs are used to represent the same or similar modules in the drawings. It should be understood that the drawings are only schematic, and the scope of protection of the present application is not limited thereto.

[0027] With the rapid development of communication networks, the application scenarios of electronic products are becoming more and more extensive. As users increasingly demand thin and light electronic products, the demand for lightweight design of batteries for electronic products is also increasing.

[0028] It should be noted that each battery (or cell) can be a secondary battery or a primary battery; for example, the battery can be a lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and the embodiments of the present application are not limited thereto. The battery can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the embodiments of the present application are not limited thereto.

[0029] In view of the increasing demand for lightweight design of batteries, soft-pack batteries are gradually being widely used due to their lightweight and customizable size. A soft-pack battery is a battery made by using soft-pack packaging technology. As shown in FIG. 1, a battery 100 generally includes a cell body 110 and a packaging shell 130. The battery 100 is a soft-pack battery. Figure 1

[0030] ​The cell body 110 has a first end surface 111 and a second end surface 112 arranged oppositely. The direction from the first end surface 111 to the second end surface 112 is the first direction, and the distance between the first end surface 111 and the second end surface 112 can be understood as the thickness of the cell body 110. That is, the size of the cell body 110 in the first direction is the thickness dimension of the cell body 110, and the first direction is the Z direction in the coordinate system shown in FIG. 1. Figure 1

[0031] The packaging shell 120 is used to encapsulate the cell body 110. The packaging shell 120 can include a containing portion 121 and an edge portion 122 connected to the containing portion 121. The containing portion 121 is used to contain and wrap the cell body 110. The edge portion 122 is used to further isolate the cell body 110 from the external environment to ensure the safety performance of the battery 100. For example, the edge portion 122 can prevent electrolyte leakage or external moisture from entering the inside of the battery 100, thereby maintaining the performance stability of the battery 100. For another example, the edge portion 122 can resist external physical impact or extrusion, protecting the battery 100 from damage.

[0032] The edge portion 122 of the battery 100 usually has a large width dimension D1. For example, for a battery 100 with a conventional thickness, it is usually required that the width D1 of the edge portion 122 of the battery 100 needs to be greater than or equal to 1.8 mm or more to ensure the reliability of the battery 100. This can cause the edge portion 122 to occupy a large space, which is not only not conducive to the utilization rate of the battery compartment, but also causes the battery 100 to have low endurance and low energy density.

[0033] In order to improve the utilization rate of the battery compartment while improving the endurance and energy density of the battery 100, as one possible implementation, the edge portion 122 can usually adopt a folded edge design, that is, the edge portion 122 can include at least two folded edges and a bending portion connecting the at least two folded edges, so as to reduce the width dimension of the edge portion 122, thereby avoiding the edge portion 122 from exceeding the size H of the containing portion in the first direction. For example, as shown in FIG. 2, on the basis of the coordinate system shown in FIG. 1, Figure 2 Figure 1 the width dimension of the edge portion 122 becomes D2 after being folded once, and D2 is less than D1. After the edge portion 122 is folded, the end portion M is folded towards the containing portion 121.

[0034] However, although the above implementation can appropriately improve the endurance and energy density of the battery 100 and other performances, the performance that can be improved is limited. In particular, in some special scenarios, the endurance and energy density of the battery 100 and other performances that can be improved by the above method do not meet the expectations.

[0035] ​​For example, in the lightweight design of the battery 100, the thickness of the cell body 110 will be designed to be thinner and thinner. At present, there are some thin cell bodies 110 with thickness dimensions lower than the conventional thickness (thickness dimension of thin cell body 110 ≤ 2.0mm). For such thin cell bodies 110, when the edge sealing 122 described above is used, even if the edge sealing 122 is already as thin as the conventional cell body 110, the thickness dimension of the cell body 110 is less than the conventional thickness. Figure 2 As shown in FIG, the edge is folded, but the width dimension D2 of the edge 122 is still greater than the thickness dimension H of the receiving portion, that is, according to Figure 3 After the edge seal 122 is bent in this manner, the edge seal 122 still exceeds the thickness of the battery cell body 110. This not only affects the utilization of the battery compartment, thereby reducing the energy density of the battery 100, but also increases the risk of the battery cell body 110 shaking in the battery compartment, thereby reducing the safety performance of the battery 100.

[0036] In summary, as battery cells become thinner and lighter, the energy density and safety performance of soft-pack batteries in related technologies need to be further improved.

[0037] In view of this, an embodiment of the present application provides a battery in which a recess is provided in the housing for enclosing the battery cell within the packaging shell. This recess allows the edge seal connected to the housing to bend and extend into the recess, thereby reducing the size of the edge seal in a first direction. This can reduce the extent of the edge seal extending beyond the thickness of the battery cell, or even prevent the edge seal from extending beyond the thickness of the battery cell, thereby further improving the energy density and safety performance of the soft-pack battery.

[0038] The following combination Figure 4 - Figure 6 , a detailed description of the battery 400 provided in an embodiment of the present application is given.

[0039] like Figure 4 and Figure 6 As shown, the battery 400 includes a cell body 410 and a packaging shell 420 .

[0040] The cell body 410 may have a first end face 411 and a second end face 412 that are disposed opposite to each other. In addition, the cell body 410 may further have a side wall 413 connecting the first end face 411 and the second end face 412. Specifically, the side wall 413 of the cell body 410 may include a first side wall 4131 (or left side wall) and a second side wall 4132 (or right side wall) that are disposed opposite to each other, and a third side wall (or top side wall) that is disposed opposite to each other. Figure 4 - Figure 6 not shown) and the fourth side wall (or bottom side wall, Figure 4 - Figure 6 The direction parallel to the direction from the first end surface 411 to the second end surface 412 is the first direction (i.e. Figure 4 - Figure 6the Z direction in FIG. 13) is a second direction (i.e., the direction parallel to the direction from the first side wall 4131 to the second side wall 4132), and the direction parallel to the direction from the third side wall to the fourth side wall is a third direction (i.e., the X direction in FIG. 13). Figure 4 - Figure 6 the Y direction in FIG. 13) is a second direction (i.e., the direction parallel to the direction from the first side wall 4131 to the second side wall 4132), and the direction parallel to the direction from the third side wall to the fourth side wall is a third direction (i.e., the X direction in FIG. 13). Figure 4 - Figure 6 the Y direction in FIG. 13) is a second direction (i.e., the direction parallel to the direction from the first side wall 4131 to the second side wall 4132), and the direction parallel to the direction from the third side wall to the fourth side wall is a third direction (i.e., the X direction in FIG. 13).

[0041] The cell body 410 can include a first pole piece, a second pole piece, and a separator located between the first pole piece and the second pole piece, which are sequentially stacked. One of the first pole piece and the second pole piece is a positive pole piece, and the other is a negative pole piece. The cell body 410 can be a stacked cell or a wound cell.

[0042] The packaging shell 420 can be understood as a soft package formed of a packaging film layer (referred to as a packaging layer) material such as an aluminum plastic film. The packaging shell 420 can include a containing portion 421 and an edge portion 422.

[0043] The containing portion 421 is formed as a structure for containing and wrapping the cell body 410, and the cell body 410 is located in the containing portion 421. The containing portion 421 can include a first containing unit 423 and a second containing unit 424.

[0044] The first containing unit 423 is used to wrap the first end surface 411 of the cell body 410, and the first containing unit 423 extends from the first end surface 411 of the cell body 410 in a direction toward the second end surface 412 of the cell body 410 to wrap part or all of the side wall 413 of the cell body 410. Preferably, as shown in FIGS. 13 and 14, the first containing unit 423 wraps all of the side wall 413 of the cell body 410. Figure 4 and Figure 6 As shown in FIGS. 13 and 14, the first containing unit 423 wraps all of the side wall 413 of the cell body 410.

[0045] The second containing unit 424 is used to wrap the second end surface 412 of the cell body 410, and the second containing unit 424 extends from the second end surface 412 of the cell body 410 toward the first containing unit 423 and can be in contact with the first containing unit 423 to jointly form a cavity structure containing the cell body 410.

[0046] The edge portion 422 is connected with the containing portion 421 and is located outside the containing portion 421. Specifically, as shown in FIGS. 13 and 14, the edge portion 422 is connected with both the first containing unit 423 and the second containing unit 424, and the edge portion 422 extends from the connection with the containing portion 421 in a direction toward the first end surface 411 of the cell body 410. Figure 4 and Figure 6 As shown in FIGS. 13 and 14, the edge portion 422 is connected with both the first containing unit 423 and the second containing unit 424, and the edge portion 422 extends from the connection with the containing portion 421 in a direction toward the first end surface 411 of the cell body 410.

[0047] wherein, as Figure 4 and Figure 6 , the end of the first accommodating unit 423 facing away from the second accommodating unit 424 (or in other words, the end of the first accommodating unit 423 abutting the first end surface 411 of the battery cell body 410) is provided with a groove 425. The edge seal 422 can be bent from the connection with the accommodating portion 421 to extend inside the groove 425, that is, the edge seal 422 can extend from the connection with the accommodating portion 421 into the groove 425 and part of the edge seal 422 is inside the groove 425.

[0048] The application embodiment can allow the edge seal 422 connected with the accommodating portion 421 to be bent to extend into the groove 425 by providing the groove 425, so as to reduce the size of the edge seal 422 in the first direction. This can reduce the size of the edge seal 422 beyond the thickness of the battery cell body 410 or even avoid the edge seal 422 beyond the thickness of the battery cell body 410, which can further improve the energy density and safety performance of the soft package battery 400 compared with the related art.

[0049] As mentioned before, the packaging shell 420 can be formed by the packaging layer. In some embodiments, as Figure 5 shown, when the packaging shell 420 is made of the packaging layer, the first end surface 411 and the second end surface 412 of the battery cell body 410 can be wrapped in the direction indicated by the arrow in Figure 5 by using the first group of packaging layers X and the second group of packaging layers Y respectively, and the first group of packaging layers X and the second group of packaging layers Y are extended from the first end surface 411 and the second end surface 412 to the position where the side wall 413 of the battery cell body 410 is located to wrap the side wall 413, until the first group of packaging layers X and the second group of packaging layers Y contact, the remaining part of the first group of packaging layers X and the remaining part of the second group of packaging layers Y are abutted from the contact position, and the abutted packaging layer is bent in the direction away from the battery in the second direction to form the side edge. The formed side edge can be, for example, Figure 4 side edge in Figure 6 or side edge in

[0050] . Wherein, the number of layers of the first group of packaging layers X is the same as the number of layers of the second group of packaging layers Y, and the number of layers of the first group of packaging layers X is the number of layers of the packaging layer contained in the first accommodating unit 423, and the number of layers of the second group of packaging layers Y is the number of layers of the packaging layer contained in the second accommodating unit 424.

[0051] The application does not make specific limitations on the forming manner of the groove 425 on the first accommodating unit 423. For example, the groove 425 on the first accommodating unit 423 can be formed based on the recessed area 426 on the battery cell body 410. As an implementation manner, as shown in Figure 5 The side wall 413 of the battery cell body 410 is provided with a recessed area 426 and a non-recessed area 427. The recessed area 426 is located at the connection of the side wall 413 of the battery cell body 410 and the first end face 411. The non-recessed area 427 is adjacent to the recessed area 426, and the non-recessed area 427 is located at the connection of the side wall 413 of the battery cell body 410 and the second end face 412.

[0052] Due to the presence of the recessed area 426, as shown in Figure 4 and Figure 6 When the first accommodating unit 423 extends from the first end face 411 of the battery cell body 410 to the direction of the second end face 412 of the battery cell body 410, the first accommodating unit 423 can be made to fit the side wall 413 to form a groove 425 corresponding to the recessed area 426.

[0053] In this way, not only can the groove 425 be conveniently formed, but also the utilization rate of the battery compartment can be improved, thereby further improving the energy density of the battery 400 and the safety performance of the battery 400.

[0054] In some embodiments, as shown in Figure 4 and Figure 6 The setting of the groove 425 can completely avoid the edge 422 exceeding the thickness of the battery cell body 410. As an implementation manner, after the edge 422 is bent and extends into the groove 425, the size h of the edge 422 in the first direction is less than or equal to the size H of the accommodating portion 421 in the first direction. The size H of the accommodating portion 421 in the first direction and the size (i.e., the thickness) H' of the battery cell body 410 in the first direction are very small and can be ignored. That is, the size H of the accommodating portion 421 in the first direction can be understood as the thickness of the battery cell body 410.

[0055] Through this setting, the edge 422 in the first direction is equivalent to being "hidden", thereby reducing the influence of the edge 422 on the thickness of the accommodating portion 421, and further improving the energy density of the battery 400. It should be noted that the hiding does not mean that the edge 422 cannot be seen, but can be understood as the first edge 422 in the first direction not exceeding the thickness of the accommodating portion 421, that is, the first edge 422 in the first direction not exceeding the thickness of the battery cell body 410.

[0056] The application does not make specific limitations on the size H1 of the groove 425 in the first direction.

[0057] In some embodiments, the size H1 of the groove 425 in the first direction ranges from 5% to 50% of the size H of the accommodating portion 421 in the first direction. With this arrangement, the "concealment" of the edge 422 in the first direction can be achieved, and the size of the recessed area 426 in the first direction H1' corresponding to the groove 425 can be limited, so as to avoid the size of the recessed area 426 provided on the battery cell body 410 being too large and affecting the energy density of the battery 400.

[0058] In some other embodiments, the groove 425 is flush with the battery cell body 410 in the first direction corresponding to the recessed area 426 in the first direction. That is, the thickness dimension H1' of the battery cell body 410 in the first direction corresponding to the recessed area 426 is the same as the thickness dimension H1 of the groove 425. As described above, the battery cell body 410 can include the first and second electrode plates. In view of this, the battery cell body 410 in the first direction corresponding to the recessed area 426 can also include the first and second electrode plates. The difference is that the sum of the number of layers of the first and second electrode plates included in the battery cell body 410 is greater than the sum of the number of layers of the first and second electrode plates included in the battery cell body 410 in the first direction corresponding to the recessed area 426.

[0059] Optionally, in the first direction, the sum of the number of layers of the first and second electrode plates provided in the battery cell body 410 in the first direction corresponding to the recessed area 426 is greater than or equal to 2. With this arrangement, the size of the recessed area 426 in the first direction can be limited, so as to avoid the size of the recessed area 426 provided on the battery cell body 410 being too large and affecting the energy density of the battery 400.

[0060] The number of recessed areas 426 is not specifically limited in the embodiments of the present application, as long as the number of recessed areas 426 is equal to the number of grooves 425, and the recessed area 426 is located at the connection of the side wall 413 of the battery cell body 410 and the first end face 411.

[0061] As an implementation manner, the number of recessed areas 426 can be one, and the recessed area 426 can be located at the connection of any one of the first side wall 4131, the second side wall 4132, the third side wall and the fourth side wall and the first end face 411.

[0062] As another implementation manner, the number of recessed areas 426 can be two, and the two recessed areas 426 can be respectively located on the two oppositely arranged side walls 413 described above. For example, the two oppositely arranged side walls 413 can include the first side wall 4131 and the second side wall 4132. For another example, the two oppositely arranged side walls 413 can include the third side wall and the fourth side wall. Preferably, as Figure 5As shown, the number of recessed regions 426 is two, and the two recessed regions 426 are respectively located on the oppositely arranged first side wall 4131 and second side wall 4132. Details are shown in Figure 5 , the first side wall 4131 and the second side wall 4132 are both provided with recessed regions 426. Compared with the distance between the first side wall 4131 and the second side wall 4132 connected with the second end face 412, the distance between the first side wall 4131 and the second side wall 4132 connected with the first end face 411 is reduced by the provision of the recessed regions 426, thereby forming a "convex" shaped battery cell body as shown in Figure 5 . In the "convex" shaped battery cell body, the size of the first end face 411 in the second direction is smaller than the size of the second end face 412 in the second direction.

[0063] Optionally, as shown in Figure 5 , the size of the recessed region 426 in the second direction is 1% to 10% of the size of the second end face in the second direction, that is, the presence of the recessed region 426 makes the size L1 of the first end face 411 in the second direction 90% to 99% of the size L of the second end face 412 in the second direction.

[0064] Through this arrangement, it can be ensured that the recessed groove 425 corresponding to the recessed region 426 can completely accommodate part of the sealing edge 422 in the recessed groove 425, and the size of the recessed region 426 on the battery cell body 410 can also be limited to avoid the size of the recessed region 426 provided on the battery cell body 410 being too large and thereby affecting the energy density of the battery 400.

[0065] As mentioned earlier, part of the sealing edge 422 is located inside the recessed groove 425. In some embodiments, as shown in Figure 4 , the part of the sealing edge 422 located inside the recessed groove 425 is the first folded edge portion 428 of the sealing edge 422, and the part of the sealing edge 422 not located inside the recessed groove 425 is the second folded edge portion 429 of the sealing edge 422. The second folded edge portion 429 extends from the connection with the accommodating portion 421 to the connection with the first folded edge portion 428. The first folded edge portion 428 and the second folded edge portion 429 together form the sealing edge 422 that can extend from the connection with the accommodating portion 421 to the inside of the recessed groove 425. That is, the sealing edge 422 includes the first folded edge portion 428 located inside the recessed groove 425 and the second folded edge portion 429 connected with the first folded edge portion 428.

[0066] Preferably, the first edge folding part 428 is projected on the accommodating part 421 in the first direction. By this arrangement, the first edge folding part 428 is "hidden" in the groove 425 in the second direction and / or the third direction, thereby reducing the influence of the first edge folding part 428 on the width or length of the accommodating part 421, further improving the energy density of the battery 400. It should be noted that the "hidden" does not mean that the first edge folding part 428 cannot be seen, but it can be understood that the projection of the first edge folding part 428 in the first direction does not exceed the position where the accommodating part 421 is located.

[0067] The embodiments of the present application do not make specific limitations to the structure of the first edge folding part 428, as long as the first edge folding part 428 is the structure of the sealing edge 422 located in the groove 425.

[0068] As an implementation manner, the first edge folding part 428 does not include a bending part. For example, as shown in FIG. 4A, the first edge folding part 428 only includes a first edge 430 connected with the second edge folding part 429, and the extension direction of the first edge 430 is a straight line direction. The end of the first edge 430 forms the end of the sealing edge 422. Figure 4

[0069] As another implementation manner, the first edge folding part 428 can include at least one bending part. The at least one bending part can be an inner folding bending part or an outer folding inner folding part. Preferably, the at least one bending part can be an inner folding bending part.

[0070] For example, as shown in FIG. 4B, the first edge folding part 428 includes an inner folding bending part, which is a first bending part 431 in FIG. 4B. Details are shown in FIG. 4C. Figure 6 Figure 6 For example, as shown in FIG. 4B, the first edge folding part 428 includes an inner folding bending part, which is a first bending part 431 in FIG. 4B. Details are shown in FIG. 4C. Figure 6 For example, as shown in FIG. 4B, the first edge folding part 428 includes an inner folding bending part, which is a first bending part 431 in FIG. 4B. Details are shown in FIG. 4C.

[0071] Optionally, the distance W between the end of the second edge 432 and the side wall 413 of the groove 425 in the second direction is greater than or equal to 0.3 mm. By limiting the size of the end of the second edge 432, it can be ensured that the first edge folding part 428 can be completely in the groove 425, avoiding the first edge folding part 428 from exceeding the groove 425, thereby affecting the thickness of the battery 400.

[0072] In order to avoid the first edge folding part 428 from separating from the groove 425, thereby affecting the overall thickness size of the battery 400. In some embodiments, as shown in FIG. 4A and FIG. 4B, Figure 4 Figure 6 ​​​As shown, the adhesive layer 433 is arranged in the groove 425, and the first folded edge portion 428 is fixedly connected with the adhesive layer 433. That is, the adhesive layer 433 can bond the first folded edge portion 428 in the groove 425. The adhesive layer 433 can be formed by glue or adhesive tape. The glue can be, for example, ultraviolet curing (UV) glue. The adhesive tape can be, for example, single-sided adhesive tape or double-sided adhesive tape. By arranging the adhesive layer 433 fixedly connected with the first folded edge portion 428 in the groove 425, the first folded edge portion 428 can be fixedly connected with the groove 425, and the first folded edge portion 428 can be prevented from rebounding out of the thickness of the battery cell body due to its own stress and other factors.

[0073] The application does not limit the bonding position of the adhesive layer 433, as long as the adhesive layer 433 can fixedly connect the first folded edge portion 428 with the groove 425.

[0074] As an implementation manner, as shown in Figure 4 As shown, the adhesive layer 433 in the groove 425 is fixedly connected with the first folded edge 430 in the first folded edge portion 428. Preferably, the adhesive layer 433 covers the end face of the first folded edge 430 at the end. By this arrangement, not only can the first folded edge portion 428 be fixedly connected with the groove 425, preventing the sealing edge 422 from rebounding out of the thickness of the battery cell body due to its own stress and other factors, but also can avoid the end face of the first folded edge 430 being exposed from the packaging layer, causing poor battery sealing performance, thereby affecting the overall performance of the battery 400.

[0075] As another implementation manner, as shown in Figure 6 As shown, the adhesive layer 433 in the groove 425 is fixedly connected with the first folded edge portion 428, and the first folded edge portion 428 includes the first folded edge 430 and the second folded edge 432. By this arrangement, the stability of the bonding can be ensured.

[0076] The application does not limit the structure of the second folded edge portion 429, as long as the second folded edge portion 429 can be folded and extended from the connection with the accommodating portion 421 to the connection with the first folded edge portion 428 to jointly form the sealing edge 422.

[0077] As an implementation manner, as shown in Figure 4 and Figure 6 As shown, the second folded edge portion 429 includes the second folded edge 434, the third folded edge 435, and the third folded edge 436, and the third folded edge 435 is connected with the second folded edge 434 and the third folded edge 436. The second folded edge 434 is further connected with the accommodating portion 421, and the third folded edge 436 is further connected with the first folded edge 430. The extension direction of the third folded edge 435 is consistent with the extension direction of the side wall 413 of the battery cell body 410.

[0078] In order to verify the performance of the battery provided in the embodiments of the present application, the performance of the battery in the related art (referred to as the comparison group) and the battery provided in the embodiments of the present application (referred to as the experimental group) is tested respectively, and the test results are analyzed. The structure of the battery of the comparison group and the experimental group and the test results are described in detail below. It should be noted that this part of the content is only to enable those skilled in the art to understand the present scheme and its influence on the performance of the battery, but the protection scope of the present application is not limited thereto.

[0079] The embodiments of the present application take battery 1588A0 as an example to set up the comparison group and the experimental group. It should be noted that the size H' of the battery core body in the battery 1588A0 in the first direction is 1.5 mm, the size in the second direction is 88 mm, and the battery core body adopts a laminated structure.

[0080] In the comparison group, the battery core body of the battery 1588A0 adopts a normal laminated structure, that is, no recessed area is formed on the battery core body; after the lamination is completed, the battery core body is packaged, and the packaging shell wrapping the battery core body is formed on the outside of the battery core body after the packaging is completed.

[0081] The packaging shell includes the sealing edge 122 designed with a folded edge as shown in Figure 2 The size D2 of the sealing edge 122 in the second direction is 2.0 mm, which is obviously larger than the thickness H' of the battery core body. That is, when the sealing edge 122 is folded like Figure 3 , the sealing edge 122 will exceed the battery core body H' by about 0.5 mm in the first direction, which will make the total thickness of the battery about 2.0 mm.

[0082] In the experimental group, the battery core body of the battery 1588A0 also adopts a laminated structure, but the size (i.e. the width size) L1 of the upper several laminated plates in the second direction is about 3.0 mm smaller than the size L of the lower laminated plates in the second direction during the lamination process, that is, L is 88 mm, and L1 is 85 mm. The size of the lower laminated plates in the second direction can be understood as the size of the normal laminated plates (i.e. the size of the laminated plates in the comparison group). After the lamination is completed, the battery core body is formed, and then the battery core body can be packaged, separated and contained to form the packaging shell. Due to the narrow width of the laminated plates on the upper layer, two recessed areas will be formed on both sides of the battery core body in the second direction, and the accommodating part of the packaging shell will form two grooves 425 after the separation. The depth H'1 of the groove 425 is about 0.7 mm.

[0083] The packaging shell includes the sealing edge 422 designed with a folded edge as shown in Figure 2 The sealing edge 422 is folded like Figure 6 Figure 6 Figure 6 Figure 4 Figure 6 Figure 4 Figure 6 Figure 4 Figure 6 Figure 2 Figure 3 Figure 2 Figure 6 Figure 6When the bending is performed, the part of the sealing edge 422 that exceeds the thickness H' of the battery cell body will be folded into the groove 425. After the folding, the distance W between the end M of the sealing edge 422 and the side wall of the groove 425 is 0.7 mm.

[0084] In the experimental group, the sealing edge 422 and the groove 425 have an adhesive layer 433. The adhesive layer 433 can be located on the contact surface of the groove 425 in the first direction. The main function of the adhesive layer 433 is to fix the sealing edge 422 in the groove 425, preventing the sealing edge 422 from rebounding due to its own stress and other factors and exceeding the thickness H' of the battery cell body, thereby affecting the energy density (ED) of the battery.

[0085] Test results: After the battery capacity is tested, the battery capacity of the battery in the comparative group is 2400 mAH', and due to the sealing edge 422 exceeding the thickness H' of the battery cell body, the ED of the battery is finally calculated as 525 WH' / L; after the battery capacity is tested, the battery capacity of the battery in the experimental group is 2360 mAH', and the ED of the battery is finally calculated as 688 WH' / L.

[0086] From the above test results, compared with the capacity of the battery in the comparative group, the capacity of the battery in the experimental group is lower, but compared with the ED of the battery in the comparative group, the ED of the battery in the experimental group is greatly improved. The reason why the capacity of the battery in the comparative group is smaller is that the battery cell body in the comparative group needs to generate a recessed area, which will result in a smaller capacity, but the change in capacity is negligible compared to the improvement in the ED of the battery. Overall, compared with the comparative group, the experimental group greatly improves the performance of the battery.

[0087] In addition, the application also provides an electronic device using the battery as a power supply. The electronic device can also be referred to as a power consumption device, and the electronic device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc.

[0088] It should be understood that, in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of the processes should be determined according to their functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0089] It should be noted that, in the above specific embodiments, each element described can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present application. For example, in some examples, the outer periphery of the piston body and the inner wall of the piston head can be respectively provided with mutually cooperating flanges and sliding grooves, so that the piston can rotate relative to the piston body about the above-mentioned axis.

[0090] It should be understood that multiple components and / or parts shown in the foregoing can be provided as single integrated components or parts. Alternatively, a single integrated component or part can be divided into separate multiple components and / or parts. The disclosure of "a" or "one" to describe a component or part is not intended to foreclose the existence of additional such components or parts.

[0091] It is to be understood that the terminology "first" or "second" and the like used in the present application merely describes various elements and does not imply that these elements must be in a particular sequence or order.

[0092] The above description is provided as an enabling teaching of the application. It is to be understood that any alterations or modifications to the embodiments described are possible without departing from the scope of the application. It is intended that the appended claims be construed to include the embodiment as described herein and any alterations or modifications to the embodiments. The above specification, examples and data are to be considered in an illustrative sense only and not as limiting the scope of the application. The application is limited only by the claims.

Claims

1. A battery, characterized by, The battery comprises: an electrode core body having a first end face and a second end face arranged oppositely; a packaging shell comprising a receiving part and a sealing edge connected to the receiving part, the electrode core body is located in the receiving part, the sealing edge is located outside the receiving part, the receiving part comprises a first receiving unit wrapping the first end face and a second receiving unit wrapping the second end face, an end of the first receiving unit away from the second receiving unit is provided with a groove, and the sealing edge is bent to extend to the groove.

2. The battery of claim 1, wherein, The electrode core body has a side wall connecting the first end face and the second end face, and the side wall is provided with a recessed area at a connection with the first end face, and the recessed area corresponds to the groove.

3. The battery of claim 1, wherein, The sealing edge comprises a first bent edge portion located in the groove, a projection of the first bent edge portion in a first direction is located on the receiving part, and the first direction is parallel to a direction from the first end face to the second end face.

4. The battery of claim 1, wherein, The size of the sealing edge in the first direction is less than or equal to the size of the receiving part in the first direction.

5. The battery of claim 1, wherein, The size of the groove in the first direction ranges from 5% to 50% of the size of the receiving part in the first direction.

6. The battery of claim 2, wherein, The side wall comprises a first side wall and a second side wall arranged oppositely, and the recessed area is arranged on both the first side wall and the second side wall, and the size of the recessed area in a second direction is 1% to 10% of the size of the second end face in the second direction.

7. The battery of claim 3, wherein, The first bent edge portion comprises a first bent edge, a first bent portion and a second bent edge, the first bent portion connects the first bent edge and the second bent edge, an end of the second bent edge forms an end of the sealing edge, and the distance between the end of the sealing edge and the side wall of the groove in the second direction is greater than or equal to 0.3mm.

8. The battery of claim 1, wherein, The number of layers of the encapsulation layer contained in the sealing edge is an even multiple of the number of layers of the encapsulation layer contained in the receiving part.

9. The battery of claim 3, wherein, The groove comprises an adhesive layer, and the first bent edge portion is fixedly connected with the adhesive layer.

10. The battery of claim 9, wherein, The adhesive layer covers the end face of the first bent edge portion.

11. The battery of claim 9, wherein, The first bent portion and the second bent edge of the first bent edge portion are fixedly connected with the adhesive layer.

12. The battery of claim 2, wherein, The electrode core body corresponding to the recessed area in the first direction is flush with the groove in the first direction, the electrode core body corresponding to the recessed area in the first direction comprises a first pole piece and a second pole piece, and the sum of the number of layers of the first pole piece and the second pole piece arranged in the electrode core body corresponding to the recessed area in the first direction is greater than or equal to 2 in the first direction.

13. An electronic device, comprising: The battery comprises the battery as claimed in any one of claims 1 to 12.

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