Battery and electronic equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery and electronic equipment, the battery comprises a first battery cell, a second battery cell and a bonding layer, the first battery cell is provided with a first positive electrode edge and a first negative electrode edge, the second battery cell is provided with a second positive electrode edge and a second negative electrode edge, the second battery cell comprises an aligned side and a non-aligned side, on the alignment side, the bonding layer extends out of the first positive electrode edge and the second positive electrode edge, or the bonding layer is flush with the first positive electrode edge and the second positive electrode edge. According to the embodiment of the invention, the purpose of improving the overall performance of the battery on the basis of ensuring high reliability and high safety of the battery can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and an electronic device. BACKGROUND

[0002] The stepped battery is usually stacked by two battery cells of different sizes, and an adhesive layer is arranged between the two battery cells. The structure design of the adhesive layer has an important influence on the reliability and safety of the stepped battery, and also has an influence on the overall performance of the stepped battery.

[0003] At present, the positional relationship design of the adhesive layer and the two battery cells is unreasonable, which leads to low reliability and safety of the stepped battery, and the overall performance of the stepped battery cannot be improved on the basis of ensuring the reliability and safety. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery and an electronic device, which can achieve the purpose of improving the overall performance of the battery on the basis of ensuring high reliability and high safety of the battery.

[0005] The first aspect of the present application provides a battery, comprising:

[0006] A first battery cell comprising a first positive electrode sheet and a first negative electrode sheet, the first positive electrode sheet forming a first positive electrode edge, and the first negative electrode sheet forming a first negative electrode edge;

[0007] A second battery cell comprising a second positive electrode sheet and a second negative electrode sheet, the second positive electrode sheet forming a second positive electrode edge, and the second negative electrode sheet forming a second negative electrode edge, the second battery cell being arranged on the first battery cell, the size of the second battery cell along a first direction being smaller than the size of the first battery cell along the first direction, and one end of the second battery cell along the first direction forming a step,

[0008] The second battery cell comprises at least one aligned side aligned with the first battery cell and at least one non-aligned side staggered with the first battery cell, and the non-aligned side corresponds to the step;

[0009] An adhesive layer having a first connecting surface and a second connecting surface, the first battery cell being connected to the first connecting surface, and the second battery cell being connected to the second connecting surface,

[0010] In the aligned side, the adhesive layer protrudes from the first positive electrode edge and the second positive electrode edge, or the adhesive layer is flush with the first positive electrode edge and the second positive electrode edge.

[0011] According to the battery of the first aspect of the present application, after comprehensively considering the structural characteristics of the battery, the conventional design of the battery cell and the influence of the adhesive layer on the pole piece, the adhesive layer is reasonably designed on the alignment side, which can improve the energy density of the battery on the basis of protecting the first battery cell and the second battery cell, thereby improving the overall performance of the battery. At the same time, based on the setting of the adhesive layer, the battery has higher connection reliability, thereby achieving the purpose of improving the overall performance of the battery on the basis of ensuring high reliability and high safety of the battery.

[0012] In a possible implementation manner, on the non-alignment side, the second positive pole piece is connected to the second connection surface, the adhesive layer extends out of the second negative pole edge, or the second negative pole piece is connected to the second connection surface, and the adhesive layer extends out of the second positive pole edge.

[0013] In a possible implementation manner, the first negative pole edge extends out of the first positive pole edge, and the second negative pole edge extends out of the second positive pole edge.

[0014] In a possible implementation manner, the first positive pole piece is connected to the first connection surface, the second positive pole piece is connected to the second connection surface, on the alignment side, the distance between the first positive pole edge and the edge of the adhesive layer is X1, and the distance between the second positive pole edge and the edge of the adhesive layer is X2, the X1 satisfies the relationship: 0mm≤X1≤0.2mm, and / or the X2 satisfies the relationship: 0mm≤X2≤0.2mm.

[0015] In a possible implementation manner, on the non-alignment side, the distance between the second negative pole edge and the edge of the adhesive layer is X3, and the X3 satisfies the relationship: X3>0mm.

[0016] In a possible implementation manner, on the alignment side, the distance between the first positive pole edge and the second positive pole edge is L1, and the L1 satisfies the relationship: L1≤0.6mm.

[0017] In a possible implementation manner, a first lug is formed on the first positive pole piece, a second lug is formed on the second positive pole piece, the first lug and the second lug are formed on the alignment side, a first insulating layer is arranged on the first lug, a second insulating layer is arranged on the second lug, the first insulating layer extends out of the adhesive layer and forms a first insulating edge, and / or the second insulating layer extends out of the adhesive layer and forms a second insulating edge.

[0018] In a possible implementation, the first positive plate close to the second battery cell in the first battery cell is a single-sided positive plate, the second positive plate close to the first battery cell in the second battery cell is a single-sided positive plate, the single-sided positive plate comprises a current collector, the current collector of the first positive plate and the current collector of the second positive plate are oppositely arranged, and a double-sided adhesive layer is arranged between the current collector of the first positive plate and the current collector of the second positive plate.

[0019] In a possible implementation, the first negative plate is connected to the first connecting surface, the second negative plate is connected to the second connecting surface, on the alignment side, the distance between the first positive edge and the edge of the adhesive layer is X4, the distance between the second positive edge and the edge of the adhesive layer is X5, the X4 satisfies the relationship: X4≥0 mm, and / or the X5 satisfies the relationship: X5≥0 mm.

[0020] In a possible implementation, on the non-alignment side, the distance between the second positive edge and the edge of the adhesive layer is X6, and the X6 satisfies the relationship: X6>0 mm.

[0021] In a possible implementation, the adhesive layer comprises:

[0022] a substrate layer;

[0023] and a glue layer, the glue layer is located on both sides of the substrate layer.

[0024] In a possible implementation, the substrate layer is made of a first material, and the first material comprises at least one of cotton paper, polyethylene terephthalate, polyvinyl chloride, non-woven fabric, and foam.

[0025] In a possible implementation, the glue layer is made of a second material, and the second material comprises at least one of polyolefin, polyurethane, silicone, polyacrylate, and rubber.

[0026] In a possible implementation, the adhesive layer comprises a third material, and the third material comprises at least one of polyolefin, polyurethane, silicone, polyacrylate, and rubber.

[0027] In a possible implementation, the thickness of the adhesive layer is H, and the H satisfies the relationship: 0.005 mm≤H≤0.040 mm.

[0028] The second aspect of the application provides an electronic device comprising the battery of the first aspect.

[0029] According to the electronic device of the second aspect of the application, the endurance time is long. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the accompanying drawings in the following description are some embodiments of the present application. Those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0031] Figure 1 A front view of a battery according to an embodiment of the present application is shown;

[0032] Figure 2 A front view of another battery according to an embodiment of the present application is shown;

[0033] Figure 3 A front view of yet another battery according to an embodiment of the present application is shown;

[0034] Figure 4 A front view of still another battery according to an embodiment of the present application is shown;

[0035] Figure 5 A front view of yet another battery according to an embodiment of the present application is shown;

[0036] Figure 6 A front view of still another battery according to an embodiment of the present application is shown;

[0037] Figure 7 A structural schematic view of a battery according to an embodiment of the present application is shown;

[0038] Figure 8 An exploded schematic view of a battery according to an embodiment of the present application is shown;

[0039] Figure 9 A front view of a battery according to an embodiment of the present application is shown; Figure 7 A front view of a battery according to an embodiment of the present application is shown;

[0040] Figure 10 A sectional view along A-A direction of a battery according to an embodiment of the present application is shown; Figure 9 A sectional view along A-A direction of a battery according to an embodiment of the present application is shown;

[0041] Figure 11 A sectional view along B-B direction of a battery according to an embodiment of the present application is shown; Figure 9 A sectional view along B-B direction of a battery according to an embodiment of the present application is shown;

[0042] Figure 12 A partial enlarged view of C part of a battery according to an embodiment of the present application is shown; Figure 10 A partial enlarged view of C part of a battery according to an embodiment of the present application is shown;

[0043] Figure 13 A structural schematic view of a battery according to an embodiment of the present application is shown;

[0044] Figure 14 FIG. 1 shows a structural schematic diagram of another battery according to an embodiment of the present application;

[0045] Figure 15 FIG. 2 shows a structural schematic diagram of an adhesive layer according to an embodiment of the present application;

[0046] Figure 16 FIG. 3 shows a structural schematic diagram of another adhesive layer according to an embodiment of the present application.

[0047] Reference signs:

[0048] 100 - first battery cell; 101 - long side; 102 - short side; 110 - first positive electrode sheet; 120 - first negative electrode sheet; 130 - first separator; 111 - first tab; 112 - first insulation layer; 200 - second battery cell; 201 - non-aligned side; 202 - aligned side; 210 - second positive electrode sheet; 220 - second negative electrode sheet; 230 - second separator; 211 - second tab; 212 - second insulation layer; 300 - adhesive layer; 301 - first connecting surface; 302 - second connecting surface; 310 - base material layer; 320 - adhesive layer. DETAILED DESCRIPTION

[0049] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0050] With the development of electronic devices towards thinness, the space in the electronic devices is getting smaller and smaller, and it is more and more difficult for the traditional square lithium ion battery to fit into the small space of the electronic devices. The square lithium ion battery is difficult to fully utilize the space of the electronic device, resulting in that the square lithium ion battery has a low space utilization rate for the electronic device, and the energy density of the square lithium ion battery is affected, thereby affecting the endurance time of the electronic device.

[0051] To solve the above problems, the related technology proposes a structure model of a special-shaped battery. The special-shaped battery has an appearance different from that of the traditional square lithium ion battery. After the special-shaped battery is installed into the electronic device, the special-shaped battery can fully utilize the internal space of the electronic device, so that the energy density of the special-shaped battery is higher, thereby prolonging the endurance time of the electronic device.

[0052] As a typical structure in the above-mentioned special-shaped battery, the stepped battery is widely used due to its high structural stability and simple manufacturing process. Generally, the stepped battery includes a first battery cell, a second battery cell, and an adhesive layer connected between the first battery cell and the second battery cell. The first battery cell and the second battery cell have different sizes, for example, the coverage area of the first battery cell is greater than that of the second battery cell, and the adhesive layer is used to realize the connection between the first battery cell and the second battery cell.

[0053] In the stepped battery, the adhesive layer plays a role in connecting the first battery cell and the second battery cell, and also plays a role in isolating the first battery cell and the second battery cell. Therefore, the structural design of the adhesive layer and the positional relationship design of the adhesive layer with the first battery cell and the second battery cell have important influences on the reliability and safety of the stepped battery. For example, when the adhesive layer is designed unreasonably, it is easy to cause the stepped battery to fall off and fail, and even short circuit and fire.

[0054] The stepped battery in the related art is not reasonable in design, and the reliability and safety of the stepped battery are not high, and the overall performance of the stepped battery cannot be improved on the basis of ensuring the reliability and safety.

[0055] Based on the above status and problems, the embodiments of the present application provide a battery, which can be a stepped battery. The battery has an edge structure design that is different from the traditional technology. This edge structure design can ensure the reliability and safety between the two battery cells, and also can make the battery have a higher energy density, thereby improving the overall performance of the battery.

[0056] The above-mentioned edge structure design is mainly realized by designing the adhesive layer and the positional relationship between the adhesive layer and the two battery cells. For the former, the adhesive layer is designed to have a higher connection strength after connecting the two battery cells. For the latter, the positional relationship between the adhesive layer and the two battery cells not only includes a horizontal positional relationship (for example, the edge design of the adhesive layer in the following embodiments), but also includes a vertical positional relationship (for example, the thickness design of the adhesive layer in the following embodiments).

[0057] The battery in the embodiments of the present application can be applied to various electronic devices, such as mobile phones, tablet computers, etc. The battery can fully utilize the internal space of the electronic device, effectively fit the light and thin design of the electronic device, and also can guarantee the endurance time of the electronic device.

[0058] For different electronic devices, the battery in the embodiments of the present application can have different structural models, which will be understood in combination with the following embodiments.

[0059] Figure 1 A front view of a battery according to an embodiment of the present application is shown; Figure 2shows a front view of another battery provided according to an embodiment of the present application; Figure 3 shows a front view of another battery provided according to an embodiment of the present application; Figure 4 1. A front view of another battery provided according to an embodiment of the present application is shown; Figure 5 shows a front view of another battery provided according to an embodiment of the present application; Figure 6 FIG2 shows a front view of another battery provided according to an embodiment of the present application. Figures 1 to 6 The battery in the embodiment of the present application includes a first battery cell 100, a second battery cell 200 and an adhesive layer 300. The first battery cell 100 and the second battery cell 200 have different coverage areas. After the two are overlapped and arranged together, the battery has different edge structures.

[0060] It should be understood that the coverage area here refers to the maximum coverage area of ​​the first battery cell 100 and the second battery cell 200 in the space. For example, when the first battery cell 100 and the second battery cell 200 are a square structure, the coverage area is the area of ​​the large plane of the first battery cell 100 or the large plane of the second battery cell. The large plane here refers to the surface with the largest area in the square structure. The overlap of the first battery cell 100 and the second battery cell 200 refers to the overlap of the large plane of the first battery cell 100 and the large plane of the second battery cell 200.

[0061] For ease of description and simplified understanding, in the battery in the embodiment of the present application, the coverage area of ​​the first battery cell 100 is greater than the coverage area of ​​the second battery cell 200, and the first battery cell 100 has a long side 101 and a short side 102. Based on the first battery cell 100, the above-mentioned different edge structures can be described in detail.

[0062] For example, in Figure 1 and Figure 3 In the example shown, the second battery cell 200 is overlapped on the first battery cell 100, and a portion of the second battery cell 200 is missing on one side in the direction of the short side 102; Figure 2 In the example shown, the second battery cell 200 is overlapped on the first battery cell 100 and a portion of each of the two sides of the second battery cell 200 in the direction of the short side 102 is missing; Figure 4 In the example described above, the second battery cell 200 is overlapped on the first battery cell 100 and a portion of the second battery cell 200 is missing on one side in the direction of the long side 101; Figure 5 In the example shown, the second battery cell 200 is overlapped on the first battery cell 100 and a portion of the second battery cell 200 is missing in both the long side 101 and the short side 102 directions. Figure 6In the shown example, the second cell 200 is arranged on the first cell 100 with an overlap and a portion of the inner region of the second cell 200 is missing.

[0063] In the above stepped cell, the second cell 200 is missing a portion such that the second cell 200 cannot be aligned with the first cell 100 in the long side 101 direction or the short side 102 direction, thereby forming a misaligned side 201 in the second cell 200, for example, in the short side 102 direction. Figure 1 and Figure 3 In the shown example, the misaligned side 201 is formed in the short side 102 direction, in the shown example, the misaligned side 201 is formed in the long side 101 direction. Figure 4 In the shown example, the misaligned side 201 is formed in the long side 101 direction.

[0064] It can be known from the above battery that the misaligned side 201 in the embodiment of the application indicates that the edge of the second cell 200 is not aligned with the corresponding edge of the first cell 100, for example, in the short side 102 direction. Figures 1 to 3 In the shown example, the edge of the second cell 200 in the short side 102 direction is staggered from the corresponding edge of the first cell 100 by an end distance, and the misaligned side 201 here forms one component part of the above edge structure.

[0065] In addition to the above-described misaligned side 201, the remaining sides of the battery can also be arranged as misaligned sides, and to ensure the energy density of the battery, the remaining sides of the battery can be arranged as aligned sides 202, that is, the edge of the second cell 200 is aligned with the corresponding edge of the first cell 100, and the aligned side 202 here forms another component part of the above edge structure. In addition, to ensure the smooth connection of the two cells and improve the energy density of the battery, the aligned side 202 can be arranged at the position of the tab of the two cells, which can be referred to in the following related embodiments.

[0066] In the embodiment of the application, it should be noted that the aligned side 202 indicates that the outermost edges of the first cell 100 and the second cell 200 are aligned or substantially aligned, rather than indicating that the tab in the first cell 100 is aligned with the tab in the second cell 200, in other words, for the aligned side 202, a certain tab in the first cell 100 can not be aligned with a certain tab in the second cell 200.

[0067] To more clearly understand the structural composition of the battery in the embodiment of the application, the embodiment of the application will mainly take Figure 1 The shown example will be taken as an example for expansion and description, in the shown example, the battery is a stepped battery. Figure 1 In the shown battery, the specific structural design of the misaligned side 201 and the aligned side 202 will be described in detail, and it can be understood that in other structural types of batteries, the aligned side 202 and the misaligned side 201 can be referred to in the above description. Figure 1The battery in the present application is designed. It is to be understood that when there are multiple aligned sides 202 and non-aligned sides 201 in the battery, each aligned side 202 and each non-aligned side 201 can be designed with reference to the above description. Figure 1 The battery in the present application is designed.

[0068] In addition, the first and second battery cells 100 and 200 in the battery in the present application can adopt the above-mentioned laminated structure or a winding core structure. For the convenience of understanding and simplifying the description, the first battery cell 100 adopts the laminated structure and the second battery cell 200 adopts the winding core structure in the following embodiments.

[0069] Figure 7 A structural schematic diagram of a battery according to an embodiment of the present application is shown; Figure 8 An exploded schematic diagram of a battery according to an embodiment of the present application is shown; Figure 9 A front view of the battery provided in the present application is shown; Figure 7 A front view of the battery provided in the present application is shown; Figure 10 A sectional view of the battery provided in the present application along the A-A direction is shown; Figure 9 A sectional view of the battery provided in the present application along the A-A direction is shown; Figure 11 A sectional view of the battery provided in the present application along the B-B direction is shown. In the present application, please refer to Figure 9 A sectional view of the battery provided in the present application along the B-B direction is shown. In the present application, please refer to Figures 7 to 11 The adhesive layer 300 is connected between the first and second battery cells 100 and 200.

[0070] The first battery cell 100 includes a first positive plate 110 and a first negative plate 120. The first positive plate 110 forms a first positive edge, and the first negative plate 120 forms a first negative edge.

[0071] For the first battery cell 100, it includes a plurality of first positive plates 110 and a plurality of first negative plates 120. A first separator 130 is further arranged between adjacent first positive and negative plates 110 and 120. Generally, the number of first positive and negative plates 110 and 120 in the first battery cell 100 can be set according to actual needs. For the convenience of understanding, the present application takes one first positive plate 110 and one first negative plate 120 close to the adhesive layer 300 as an example to illustrate the first battery cell 100. In the following embodiments, it will be recognized that the first positive plate 110 can be connected to the adhesive layer 300, and the first negative plate 120 can also be connected to the adhesive layer 300.

[0072] It should be noted that the first positive plate 110 and the first negative plate 120 far away from the bonding layer 300 are less affected by the bonding layer 300, and the influence gradually decreases with the increase of the distance away, but it can be understood that the design made for one first positive plate 110 and one first negative plate 120 close to the bonding layer 300 in the following embodiments can still be used for other first positive plates 110 and first negative plates 120.

[0073] It can be understood that the first positive plate 110 has an edge, which is the first positive plate edge, and the first negative plate 120 has an edge, which is the first negative plate edge.

[0074] The second electrode 200 includes a second positive plate 210 and a second negative plate 220, the second positive plate 210 forms a second positive plate edge, and the second negative plate 220 forms a second negative plate edge.

[0075] For the second electrode 200, it includes a plurality of second positive plates 210 and a plurality of second negative plates 220, and a second separator 230 is also arranged between adjacent second positive plates 210 and second negative plates 220. Generally, the number of second positive plates 210 and second negative plates 220 in the second electrode 200 can be set according to actual needs, for the convenience of understanding, the present application embodiment takes one second positive plate 210 and one second negative plate 220 close to the bonding layer 300 as an example to explain the second electrode 200, and it will be realized in the following embodiments that the second positive plate 210 can be connected to the bonding layer 300, and the second negative plate 220 can also be connected to the bonding layer 300.

[0076] It should be noted that the second positive plate 210 and the second negative plate 220 far away from the bonding layer 300 are less affected by the bonding layer 300, and the influence gradually decreases with the increase of the distance away, but it can be understood that the design made for one second positive plate 210 and one second negative plate 220 close to the bonding layer 300 in the following embodiments can still be used for other second positive plates 210 and second negative plates 220.

[0077] It can be understood that the second positive plate 210 has an edge, which is the second positive plate edge, and the second negative plate 220 has an edge, which is the second negative plate edge.

[0078] In the embodiments of the present application, the first positive plate 110, the first negative plate 120, the second positive plate 210 and the second negative plate 220 can adopt a double-sided structure or a single-sided structure. For the first positive plate 110 and the second positive plate 210, the double-sided structure means that the active material is coated on both surfaces of the aluminum foil, and the single-sided structure means that the active material is coated on one surface of the aluminum foil. For the first negative plate 120 and the second negative plate 220, the double-sided structure means that the active material is coated on both surfaces of the copper foil, and the single-sided structure means that the active material is coated on one surface of the copper foil.

[0079] In the embodiments of the present application, in order to improve the energy density, the plate (which can be one of the first positive plate 110, the first negative plate 120, the second positive plate 210 and the second negative plate 220) close to the bonding layer 300 can adopt a single-sided structure, that is, the side of the plate close to the bonding layer 300 is not provided with the active material.

[0080] For the overall structure of the battery, the size of the second cell 200 along the first direction is smaller than the size of the first cell 100 along the first direction (X direction), one end of the second cell 200 along the first direction forms a step, the second cell 200 includes at least one aligned side 202 aligned with the first cell 100 and at least one non-aligned side 201 staggered with the first cell 100, and the non-aligned side 201 corresponds to the step. Figure 7

[0081] The bonding layer 300 can be configured as a double-sided adhesive structure and has a first connecting surface 301 and a second connecting surface 302. The first cell 100 is connected to the first connecting surface 301, and the second cell 200 is connected to the second connecting surface 302.

[0082] The double-sided adhesive structure here means that the bonding layer 300 includes two connecting parts with adhesion. The two connecting parts can have a unified structure, so that the first cell 100 and the second cell 200 can form the same bonding force with the bonding layer 300, so that the two sides of the bonding layer 300 have the same or similar connection strength, thereby improving the reliability of the battery. The unified structure can be realized by selecting a suitable surface structure or material, for example, the two connecting parts adopt the same material, or the two connecting parts adopt a unified surface structure, for example, the two connecting parts adopt a plane structure with the same surface roughness.

[0083] On the aligned side 202, the bonding layer 300 protrudes from the first positive edge and the second positive edge, or the bonding layer 300 is flush with the first positive edge and the second positive edge. On the non-aligned side, the second positive plate 210 is connected to the second connecting surface 302, the bonding layer 300 protrudes from the second negative edge, or the second negative plate 220 is connected to the second connecting surface 302, and the bonding layer 300 protrudes from the second positive edge.​

[0084] In the aligned side 202, the bonding layer 300 needs to be at least flush with the first positive electrode edge and the second positive electrode edge, and in the unaligned side 201, the bonding layer 300 needs to be at least flush with the second negative electrode edge or the second positive electrode edge, which can protect the edges of the first battery cell 100 and the edges of the second battery cell 200, and can ensure the safety of the battery, and by designing the overhanging distance at the corresponding position, the overall performance of the battery can be improved.

[0085] Specifically, in combination with the foregoing, the coverage area of the first battery cell 100 is larger than that of the second battery cell 200, and in the specific design, the second battery cell 200 usually needs to be connected to the first battery cell 100, and in the connection process, the second battery cell 200 needs to take the first battery cell 100 as a reference, therefore, the aligned side 202 and the unaligned side 201 are mainly described for the second battery cell 200, and the design of the position relationship between the bonding layer 300 and the aligned side 202 and the unaligned side 201 is mainly realized by the corresponding design of the second battery cell 200. In addition, in the design of the battery, as a common design method of the battery cell, the first negative electrode edge can be designed to overhang the first positive electrode edge, and the second negative electrode edge can be designed to overhang the second positive electrode edge, so that the first negative electrode sheet 120 and the second negative electrode sheet 220 can provide more active sites for the lithium ions on the first positive electrode sheet 110 and the second positive electrode sheet 210, respectively, and the lithium ions are more easily embedded on the first negative electrode sheet 120 and the second negative electrode sheet 220, which can improve the energy density of the first battery cell 100 and the second battery cell 200, thereby improving the overall energy density of the battery, and on this basis and in combination with the foregoing theory that the bonding layer 300 has less influence on the electrode sheet far away from the bonding layer 300, in the aligned side 202, the bonding layer 300 can protect the first battery cell 100 when it is flush with the first positive electrode edge and the second positive electrode edge, and in the unaligned side, when the second positive electrode sheet 210 is close to the bonding layer 300, to protect the second negative electrode sheet 220 adjacent to the second positive electrode sheet 210, the bonding layer 300 needs to overhang the second negative electrode edge, and when the second negative electrode sheet 220 is connected to the bonding layer 300, the second negative electrode sheet 220 itself overhangs the second positive electrode sheet 210, to protect the second positive electrode sheet 210 adjacent to the second negative electrode sheet 220, the bonding layer 300 needs to overhang the second positive electrode edge.

[0086] The battery in the embodiments of the present application adopts different design manners for the adhesive layer 300 on the aligned side 202 and the non-aligned side 201 after comprehensively considering the structural characteristics of the battery, the conventional design of the battery cell and the influence theory of the adhesive layer 300 on the pole piece, which can improve the energy density of the battery on the basis of protecting the first battery cell 100 and the second battery cell 200, thereby improving the overall performance of the battery, and at the same time, based on the setting of the double-sided adhesive structure of the adhesive layer 300, the battery has higher connection reliability, thereby achieving the purpose of improving the overall performance of the battery on the basis of ensuring high reliability and high safety of the battery.

[0087] In some embodiments, referring to Figures 9 to 11 , the first positive pole piece 110 is connected to the first connecting surface 301, and the second positive pole piece 210 is connected to the second connecting surface 302. On the aligned side 202, the distance between the first positive pole edge and the edge of the adhesive layer 300 is X1, and the distance between the second positive pole edge and the edge of the adhesive layer 300 is X2. X1 satisfies the relationship: 0mm≤X1≤0.2mm, and X2 satisfies the relationship: 0mm≤X2≤0.2mm.

[0088] In combination with the foregoing, it can be understood that the first positive pole piece 110 and the second positive pole piece 210 herein can adopt a single-sided structure. When X1 is 0mm, the first positive pole edge is flush with the edge of the adhesive layer 300. When X2 is 0mm, the second positive pole edge is flush with the edge of the adhesive layer 300. When X1 is 0.2mm, the adhesive layer 300 extends beyond the first positive pole edge. When X2 is 0.2mm, the adhesive layer 300 extends beyond the second positive pole edge. Here, X1 is designed to the above size, which can avoid the first negative pole piece 120 from contacting the first positive pole piece 110 in the case of the first separator 130 being folded, thereby avoiding short circuit, fire and other phenomena, and also avoiding affecting the energy density of the battery due to the adhesive layer 300 being designed too large. Similarly, X2 is designed to the above size, which can avoid the second negative pole piece 220 from contacting the second positive pole piece 210 in the case of the second separator 230 being folded, thereby avoiding short circuit, fire and other phenomena, and also avoiding affecting the energy density of the battery due to the adhesive layer 300 being designed too large.

[0089] Referring to Figure 9 and Figure 10 , the two sides of the second battery cell 200 along the X direction respectively form an aligned side 202 and a non-aligned side 201; referring to Figure 9 and Figure 11 , the two sides of the second battery cell 200 along the Y direction each form an aligned side 202.

[0090] In some embodiments, referring to Figure 10On the misaligned side 201, the distance between the second negative electrode edge and the edge of the adhesive layer 300 is X3, and X3 satisfies the relationship: X3>0 mm.

[0091] Here, X3 is designed to the above size, which can avoid the first negative electrode sheet 120 from contacting the first positive electrode sheet 110 to cause short circuit.

[0092] Figure 12 A partial enlarged view of the C part in FIG. 1 is shown. In some embodiments, please refer to Figure 10 On the misaligned side 201, the distance between the second negative electrode edge and the edge of the adhesive layer 300 is X3, and X3 satisfies the relationship: X3>0 mm. Figure 12 On the aligned side 202, the distance between the first positive electrode edge and the second positive electrode edge is L1, and L1 satisfies the relationship: L1≤0.6 mm.

[0093] Here, L1 is designed to the above size, which can avoid the first positive electrode sheet 110 and the second positive electrode sheet 210 from being greatly misaligned to affect the energy density of the battery, and can improve the performance stability of the battery.

[0094] Figure 13 A structure schematic diagram of a battery according to an embodiment of the present application is shown. In some embodiments, please refer to Figure 13 The first positive electrode sheet 110 is formed with a first tab 111, and the second positive electrode sheet 210 is formed with a second tab 211. The first tab 111 and the second tab 211 are formed on the aligned side 202. The first tab 111 is provided with a first insulating layer 112, and the second tab 211 is provided with a second insulating layer 212. The first insulating layer 112 extends out of the adhesive layer 300 and forms a first insulating edge, and the second insulating layer 212 extends out of the adhesive layer 300 and forms a second insulating edge.

[0095] Please refer to Figure 13 The distance between the first insulating edge and the edge of the adhesive layer 300 is L2, and the distance between the second insulating edge and the edge of the adhesive layer 300 is L3. L2 satisfies the relationship: L2≥0 mm, and L3 satisfies the relationship: L3≥0 mm.

[0096] Forming the first tab 111 and the second tab 211 on the aligned side 202 can prevent short circuit between the first tab 111 and the first negative electrode sheet 120 or between the second tab 211 and the second negative electrode sheet 220, thereby improving the overall safety of the battery. Designing L2 and L3 to the above sizes respectively can avoid affecting the thickness of the first tab 111 and the second tab 211, thereby avoiding loss of energy density.

[0097] In the above embodiments, the first positive tab 110 close to the second battery cell 200 in the first battery cell 100 can be a single-sided positive tab, the second positive tab 210 close to the first battery cell 100 in the second battery cell 200 is a single-sided positive tab, the single-sided positive tab includes a current collector, the current collector of the first positive tab 110 and the current collector of the second positive tab 210 are oppositely arranged, the current collector can be formed of an aluminum foil, and the double-sided adhesive layer is arranged between the current collector of the first positive tab 110 and the current collector of the second positive tab 210.

[0098] Figure 14 A structural schematic diagram of another battery according to an embodiment of the present application is shown. In other embodiments, please refer to Figure 14 The first negative tab 120 is connected to the first connecting surface 301, the second negative tab 220 is connected to the second connecting surface 302, and the distance between the first positive edge and the edge of the adhesive layer 300 on the aligned side 202 is X4, the distance between the second positive edge and the edge of the adhesive layer 300 is X5, X4 satisfies the relationship: X4≥0mm, and X5 satisfies the relationship: X5≥0mm.

[0099] In combination with the foregoing, it can be understood that the first negative tab 120 and the second negative tab 220 here can adopt a single-sided structure, when X4 takes a value of 0mm, the first negative edge is flush with the edge of the adhesive layer 300, when X5 takes a value of 0mm, the second negative edge is flush with the edge of the adhesive layer 300, when X4 takes a value greater than 0mm, the adhesive layer 300 extends beyond the first negative edge, and when X5 takes a value greater than 0mm, the adhesive layer 300 extends beyond the second negative edge. Here, X4 and X5 are designed to have the above dimensions, which can ensure that the battery has sufficient flatness on the aligned side 202, thereby improving the performance stability of the battery.

[0100] In some embodiments, please refer to Figure 14 On the non-aligned side 201, the distance between the second positive edge and the edge of the adhesive layer 300 is X6, and X6 satisfies the relationship: X6>0mm.

[0101] Here, X6 is designed to have the above dimensions, which can ensure that the stepped battery cell also has high flatness on the non-aligned side 201, thereby improving the performance stability of the battery.

[0102] In the embodiments of the present application, in order to form a double-sided adhesive structure, the adhesive layer 300 can adopt at least one of the following ways.

[0103] Figure 15 A structural schematic diagram of an adhesive layer according to an embodiment of the present application is shown. Figure 16 A structural schematic diagram of another adhesive layer according to an embodiment of the present application is shown.

[0104] In the first mode, please refer to Figure 15 The adhesive layer 300 has higher structural strength, which includes a substrate layer 310 and adhesive layers 320 on both sides of the substrate layer 310.

[0105] In the first mode, the adhesive layer 300 forms a three-layer structure, including two adhesive layers 320 and a substrate layer 310. The substrate layer 310 is made of a first material, which can include at least one of cotton paper, polyethylene terephthalate, polyvinyl chloride, non-woven fabric, and foam. The adhesive layer 320 is made of a second material, which can include at least one of polyolefin, polyurethane, silicone, polyacrylate, and rubber.

[0106] In the first mode, the substrate layer 310 is made of a material with appropriate strength and softness, so that the adhesive layer 300 has better ductility as a whole. For example, when the substrate layer 310 is made of foam (such as acrylic foam), it has better ductility and better adhesion to the second material, which can enable the second material to be stably connected to the substrate layer 310.

[0107] In the second mode, please refer to Figure 16 The adhesive layer 300 has better softness and higher adhesion, which is made of a third material, which includes at least one of polyolefin, polyurethane, silicone, polyacrylate, and rubber.

[0108] In other modes, the adhesive layer 300 can also be designed in a nested structure, for example, the adhesive layer 300 can include a substrate, which can be a grid-shaped structure, and the inside of the substrate can be filled with adhesive material, such as the second material or the third material described above.

[0109] In some embodiments, the thickness of the adhesive layer 300 is H, which satisfies the relationship: 0.005mm≤H≤0.040mm.

[0110] Here, the H is designed to be the above size to isolate the first battery cell 100 and the second battery cell 200, prevent short circuit between them, and at the same time, ensure that the battery has higher power density.

[0111] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0112] In the description of the present application, it needs to be understood that the terms "include" and "have" and any variations thereof used in the embodiments of the present application are intended to cover the inclusions without exclusivity, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0113] Unless otherwise clearly specified and limited, the terms "mount", "connect", "connect", "fix", and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or become an integral part; can be directly connected, or indirectly connected through an intermediate medium, can make the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0114] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A first battery cell includes a first positive electrode sheet and a first negative electrode sheet, wherein the first positive electrode sheet forms a first positive electrode edge, and the first negative electrode sheet forms a first negative electrode edge; The second battery cell includes a second positive electrode sheet and a second negative electrode sheet, the second positive electrode sheet forms a second positive electrode edge, the second negative electrode sheet forms a second negative electrode edge, the second battery cell is overlapped on the first battery cell, the size of the second battery cell along the first direction is smaller than the size of the first battery cell along the first direction, and a step is formed at one end of the second battery cell along the first direction. The second battery cell includes at least one aligned side aligned with the first battery cell and at least one non-aligned side offset from the first battery cell, the non-aligned side corresponding to the step; and an adhesive layer, the adhesive layer having a first connecting surface and a second connecting surface, the first battery cell being connected to the first connecting surface, and the second battery cell being connected to the second connecting surface, On the aligned side, the adhesive layer extends beyond the first positive electrode edge and the second positive electrode edge, or the adhesive layer is flush with the first positive electrode edge and the second positive electrode edge.

2. The battery according to claim 1, characterized in that On the non-aligned side, the second positive electrode sheet is connected to the second connection surface, and the adhesive layer extends out of the second negative electrode edge, or the second negative electrode sheet is connected to the second connection surface, and the adhesive layer extends out of the second positive electrode edge.

3. The battery according to claim 2, characterized in that The first positive electrode sheet is connected to the first connecting surface, and the second positive electrode sheet is connected to the second connecting surface. On the alignment side, the distance between the edge of the first positive electrode and the edge of the adhesive layer is X1, and the distance between the edge of the second positive electrode and the edge of the adhesive layer is X2. X1 satisfies the relationship: 0mm≤X1≤0.2mm, and / or X2 satisfies the relationship: 0mm≤X2≤0.2mm.

4. The battery according to claim 3, characterized in that On the non-aligned side, a distance between an edge of the second negative electrode and an edge of the adhesive layer is X3, and X3 satisfies the relationship: X3>0 mm.

5. The battery according to claim 3, characterized in that On the aligned side, a distance between the first positive electrode edge and the second positive electrode edge is L1, and L1 satisfies the relationship: L1≤0.6 mm.

6. The battery according to claim 3, characterized in that A first electrode tab is formed on the first positive electrode sheet, a second electrode tab is formed on the second positive electrode sheet, the first electrode tab and the second electrode tab are formed on the aligned side, a first insulating layer is provided on the first electrode tab, a second insulating layer is provided on the second electrode tab, the first insulating layer extends out of the adhesive layer and forms a first insulating edge, and / or the second insulating layer extends out of the adhesive layer and forms a second insulating edge.

7. The battery according to claim 3, characterized in that The first positive electrode sheet in the first battery cell close to the second battery cell is a single-sided positive electrode sheet, and the second positive electrode sheet in the second battery cell close to the first battery cell is a single-sided positive electrode sheet. The single-sided positive electrode sheet includes a current collector, and the current collector of the first positive electrode sheet and the current collector of the second positive electrode sheet are arranged opposite to each other, and a double-sided adhesive layer is provided between the current collector of the first positive electrode sheet and the current collector of the second positive electrode sheet.

8. The battery according to claim 2, characterized in that The first negative electrode sheet is connected to the first connecting surface, and the second negative electrode sheet is connected to the second connecting surface. On the aligned side, the distance between the edge of the first positive electrode and the edge of the adhesive layer is X4, and the distance between the edge of the second positive electrode and the edge of the adhesive layer is X5, and X4 satisfies the relationship: X4≥0mm, and / or X5 satisfies the relationship: X5≥0mm.

9. The battery according to claim 8, characterized in that On the non-aligned side, a distance between an edge of the second positive electrode and an edge of the adhesive layer is X6, and X6 satisfies the relationship: X6>0 mm.

10. The battery according to any one of claims 1 to 9, characterized in that The adhesive layer comprises: substrate layer; and adhesive layers, wherein the adhesive layers are located on both sides of the substrate layer.

11. The battery according to any one of claims 1 to 9, characterized in that The thickness of the adhesive layer is H, and H satisfies the relationship: 0.005 mm ≤ H ≤ 0.040 mm.

12. An electronic device, characterized in that: Comprising a battery according to any one of claims 1 to 11.

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