Battery and electric device

Abstract

The invention relates to the technical field of battery energy, in particular to a battery and an electric device. The battery comprises a battery cell and a packaging film wrapping the outer side of the battery cell, the battery cell comprises a first main body part and a second main body part which are stacked, the first main body part comprises at least one first pole piece and at least one second pole piece, the second main body part comprises at least one third pole piece and at least one fourth pole piece, and the edge of the first main body part in the first direction exceeds the second main body part; the packaging film comprises a first containing part and a second containing part, the edge, in the first direction, of the first containing part exceeds the second containing part, the first main body part is located in the first containing part, the second main body part is located in the second containing part, and a top sealing edge is arranged at the end, in the first direction, of the second containing part. The part, exceeding the second containing part, of the first containing part is located on one side of the top sealing edge. And the space on one side of the top sealing edge of the battery can accommodate more active substances, so that the volume energy density of the battery is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery energy, and particularly relates to a battery and an electrical device using the same. Background Art

[0002] Due to the high energy density characteristics, lithium-ion batteries have been gradually widely used in the field of consumer electronics. With the increasing demand for the energy density of lithium-ion batteries in consumer electronics, improving the energy per unit space of lithium-ion batteries has become one of the development directions of lithium-ion batteries.

[0003] Currently, a soft-pack lithium-ion battery includes a battery cell and a packaging film wrapped outside the battery cell, and the tab of the battery cell is arranged at the end of the battery cell. During the production process of the soft-pack lithium-ion battery, a top sealing edge is formed at one end of the packaging film where the tab of the battery cell is arranged. Through the top sealing edge, a sealed environment can be formed inside the packaging film, and at the same time, the space on one side of the packaging film can be used to install a battery protection board.

[0004] However, it is difficult to effectively improve the energy density of the battery. Summary of the Invention

[0005] Based on this, the present application provides a battery and an electrical device using the same to solve the problem that it is difficult to effectively improve the energy density of the battery in the related art.

[0006] On the one hand, the present application provides a battery, including a battery cell and a packaging film wrapped outside the battery cell;

[0007] The battery cell includes a first main body portion and a second main body portion stacked, the first main body portion includes at least one first pole piece and at least one second pole piece stacked alternately, the second main body portion includes at least one third pole piece and at least one fourth pole piece stacked alternately, the edge of the first main body portion in the first direction extends beyond the second main body portion, and the tabs of each pole piece are all configured for external electrical connection;

[0008] The packaging film includes a first accommodating portion and a second accommodating portion, the edge of the first accommodating portion in the first direction extends beyond the second accommodating portion, the first main body portion is located inside the first accommodating portion, the second main body portion is located inside the second accommodating portion, a top sealing edge is provided at the end of the second accommodating portion in the first direction, and the part where the first accommodating portion extends beyond the second accommodating portion is located on one side of the top sealing edge.

[0009] In a possible implementation manner, the battery further includes a first adapter and a second adapter, the top sealing edge respectively wraps the middle parts of the first adapter and the second adapter, each first pole piece and each third pole piece are respectively electrically connected to the first adapter, and each second pole piece and each fourth pole piece are respectively electrically connected to the second adapter.

[0010] In a possible implementation, the first pole piece includes a first pole piece body and a first tab. A first notch and a second notch are provided on the side of the first pole piece body. One end of the first tab extends into the first notch and is electrically connected to the first pole piece body;

[0011] The second pole piece includes a second pole piece body and a second tab. A third notch and a fourth notch are provided on the side of the second pole piece body. One end of the second tab extends into the third notch and is electrically connected to the second pole piece body;

[0012] The second notch allows the second tab to pass through, and the fourth notch allows the first tab to pass through. Each first tab and each third pole piece are electrically connected to a first adapter, and each second tab and each fourth pole piece are electrically connected to a second adapter.

[0013] In a possible implementation, the bottom edges of the first notch and the second notch are flush with the edge of the third pole piece in the first direction; and / or,

[0014] The bottom edges of the third notch and the fourth notch are flush with the edge of the fourth pole piece in the first direction.

[0015] In a possible implementation, the width difference between the first notch and the first tab is greater than or equal to 0.5 mm, the width difference between the second notch and the second tab is greater than or equal to 0.5 mm, the width difference between the third notch and the second tab is greater than or equal to 0.5 mm, and the width difference between the fourth notch and the first tab is greater than or equal to 0.5 mm.

[0016] In a possible implementation, in the stacking direction of the pole pieces, there is a gap between the top sealing edge and the first accommodating portion.

[0017] In a possible implementation, the gap is greater than or equal to 0.5 mm.

[0018] In a possible implementation, the end of the first accommodating portion in the first direction is flush with the end of the top sealing edge away from the second main portion.

[0019] In a possible implementation, the pole piece at one end of the first main portion facing the second main portion has the opposite polarity to the pole piece at one end of the second main portion facing the first main portion.

[0020] In a possible implementation, the battery cell further includes a separator, and at least one layer of separator is provided between adjacent two pole pieces.

[0021] On the other hand, the present application provides an electrical device including the above-mentioned battery.

[0022] The battery and electrical device provided in the present application, the battery cell includes a first main body and a second main body which are stacked, and the edge of the first main body exceeds the second main body. The first main body and the second main body each include a plurality of stacked pole pieces. Correspondingly, the packaging film includes a first accommodating portion and a second accommodating portion, the top sealing edge is arranged on the second accommodating portion, the first main body is located in the first accommodating portion, the second main body is located in the second accommodating portion, the edge of the first accommodating portion exceeds the second accommodating portion, and the portion of the first accommodating portion which exceeds the second accommodating portion is located on one side of the top sealing edge. In this way, the space on one side of the top sealing edge can accommodate more active materials, and the space on the side of the top sealing edge which is away from the first accommodating portion can be used to place a battery protection plate, and the volume proportion of the battery cell in the battery is increased, which effectively improves the volume energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a structural schematic diagram of a battery in the prior art;

[0025] Figure 2 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0026] Figure 3 for Figure 2 Cross-sectional view at position L1;

[0027] Figure 4 for Figure 2 Cross-sectional view at position L2;

[0028] Figure 5 for Figure 2 Cross-sectional view at position L3;

[0029] Figure 6 A schematic diagram of the structure of the first pole piece provided in an embodiment of the present application;

[0030] Figure 7 A schematic diagram of the structure of the third pole piece provided in an embodiment of the present application;

[0031] Figure 8 A schematic diagram of the structure of the second pole piece provided in an embodiment of the present application;

[0032] Figure 9 A schematic diagram of the structure of the fourth pole piece provided in an embodiment of the present application;

[0033] Figure 10 This is a schematic structural diagram of the packaging film provided by the embodiment of the present application.

[0034] Description of the reference numerals in the drawings:

[0035] 100 - battery cell; 110 - first main body; 111 - first pole piece; 1111 - first pole piece main body; 1112 - first tab; 1113 - first notch; 1114 - second notch; 112 - second pole piece; 1121 - second pole piece main body; 1122 - second tab; 1123 - third notch; 1124 - fourth notch; 120 - second main body; 121 - third pole piece; 1211 - third pole piece main body; 1212 - third tab; 122 - fourth pole piece; 1221 - fourth pole piece main body; 1222 - fourth tab; 130 - separator

[0036] 200 - packaging film; 210 - first accommodating part; 220 - second accommodating part; 230 - top sealing edge

[0037] 300 - first adapter

[0038] 400 - second adapter Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The described embodiments are some but not all of the embodiments of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0040] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, or an indirect connection through an intermediate medium, or the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0042] In the description and claims of the present application, and in the above-mentioned drawings, the terms "first", "second", "third" (if any) are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.

[0043] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or display that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or displays.

[0044] In the prior art, as Figure 1 shown, after the soft-pack lithium-ion battery is encapsulated, the packaging film 200 forms a top-sealing edge 230 at one end of the battery cell where the tab is provided. Through the top-sealing edge 230, a sealed environment can be formed inside the packaging film 200, and at the same time, the space on one side of the packaging film 200 can be used to install a battery protection board. However, the side of the top-sealing edge 230 facing away from the battery protection board is not utilized, and the top-sealing edge 230 limits the volume ratio of the battery cell in the battery, making it difficult to effectively improve the energy density of the battery.

[0045] After repeated thinking and verification, the inventor found that if a part of the battery cell can extend into the space on the side of the top-sealing edge facing away from the battery protection board, after the battery is encapsulated, a protruding part is formed on the side of the packaging film facing away from the top-sealing edge to accommodate the part of the battery cell extending into the side space of the top-sealing edge. In this way, the space on the side of the top-sealing edge facing away from the battery protection board of the battery can accommodate more active substances. Compared with the existing battery, the volume ratio of the battery cell is increased, and thus the energy density of the battery can be effectively improved.

[0046] In view of this, the inventor has designed a battery and an electrical device. The battery cell of the battery includes a first main body portion and a second main body portion stacked on top of each other. The edge of the first main body portion extends beyond the second main body portion, and the part of the first main body portion that extends beyond the second main body portion extends into one side of the top sealing edge. The packaging film is provided with a first accommodating portion and a second accommodating portion. The first accommodating portion is used to accommodate the first main body portion, and the second accommodating portion is used to accommodate the second main body portion. The part of the first accommodating portion that extends beyond the second accommodating portion extends into one side of the top sealing edge. In this way, the volume ratio of the battery cell in the battery is increased, and the volumetric energy density of the battery is effectively improved.

[0047] The technical solutions of the battery and the electrical device provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Among them, the first direction is the direction indicated by the X-axis, and the multiple electrode plates of the battery cell are stacked along the direction indicated by the Z-axis.

[0048] Refer to Figures 2 - 5 As shown in the figure, the battery provided by the embodiment of the present application includes a battery cell 100 and a packaging film 200 wrapped outside the battery cell 100. The battery cell 100 includes a first main body portion 110 and a second main body portion 120 stacked on top of each other. The first main body portion 110 includes at least one first electrode plate 111 and at least one second electrode plate 112 stacked alternately. The second main body portion 120 includes at least one third electrode plate 121 and at least one fourth electrode plate 122 stacked alternately. The edge of the first main body portion 110 in the first direction extends beyond the second main body portion 120, and the tabs of each electrode plate are configured for external electrical connection. The packaging film 200 includes a first accommodating portion 210 and a second accommodating portion 220. The edge of the first accommodating portion 210 in the first direction extends beyond the second accommodating portion 220. The first main body portion 110 is located inside the first accommodating portion 210, and the second main body portion 120 is located inside the second accommodating portion 220. A top sealing edge 230 is provided at the end of the second accommodating portion 220 in the first direction, and the part of the first accommodating portion 210 that extends beyond the second accommodating portion 220 is located on one side of the top sealing edge 230.

[0049] Among them, the battery cell 100 is a stacked cell formed by stacking multiple electrode plates. Schematically, the first electrode plate 111 and the third electrode plate 121 have the same polarity, the second electrode plate 112 and the fourth electrode plate 122 have the same polarity, and the first electrode plate 111 and the second electrode plate 112 have opposite polarities. In a possible implementation manner, both the first electrode plate 111 and the third electrode plate 121 are positive electrode plates; both the second electrode plate 112 and the fourth electrode plate 122 are negative electrode plates. In another possible implementation manner, both the first electrode plate 111 and the third electrode plate 121 are negative electrode plates; both the second electrode plate 112 and the fourth electrode plate 122 are positive electrode plates.

[0050] In a specific embodiment, when multiple pole pieces of the battery cell 100 are stacked, the end of the first pole piece 111 in the first direction exceeds the third pole piece 121, and the end of the second pole piece 112 in the first direction exceeds the fourth pole piece 122. Each pole piece is provided with a pole ear, and when each pole ear is electrically connected to the outside, the battery can be charged and discharged.

[0051] The shape of the first receiving portion 210 matches the shape of the first main body 110, and the shape of the second receiving portion 220 matches the shape of the second main body 120. It is worth mentioning that in the first direction, the size of the portion of the first receiving portion 210 that exceeds the second receiving portion 220 is less than or equal to the size of the top sealing edge 230. The above arrangement can avoid the size of the battery in the first direction from increasing, thereby ensuring the energy density of the battery.

[0052] The present embodiment does not limit the specific number of pole pieces, and those skilled in the art can set it according to actual needs.

[0053] The battery provided in this embodiment has a battery cell 100 including a first main body 110 and a second main body 120 which are stacked, and the edge of the first main body 110 exceeds the second main body 120. The first main body 110 and the second main body 120 each include a plurality of stacked pole pieces. Accordingly, the packaging film 200 includes a first accommodating portion 210 and a second accommodating portion 220, and the top sealing edge 230 is arranged on the second accommodating portion 220. The first main body 110 is located in the first accommodating portion 210, and the second main body 120 is located in the second accommodating portion 220. The edge of the first accommodating portion 210 exceeds the second accommodating portion 220, and the portion of the first accommodating portion 210 which exceeds the second accommodating portion 220 is located on one side of the top sealing edge 230. In this way, the space on one side of the top sealing edge 230 can accommodate more active materials, and the space on the side of the top sealing edge 230 which is away from the first accommodating portion 210 can be used to place the battery protection plate, and the volume proportion of the battery cell 100 in the battery is increased, which effectively improves the volume energy density of the battery.

[0054] In one embodiment, Figures 2 - 5 As shown, the battery also includes a first adapter 300 and a second adapter 400, the top sealing edge 230 respectively covers the middle part of the first adapter 300 and the middle part of the second adapter 400, each first pole piece 111 and each third pole piece 121 are respectively electrically connected to the first adapter 300, and each second pole piece 112 and each fourth pole piece 122 are respectively electrically connected to the second adapter 400.

[0055] In a possible implementation, both the first adapter 300 and the second adapter 400 are metal sheet structures. The top sealing edge 230 encapsulates the middle parts of the first adapter 300 and the second adapter 400 through an encapsulation process, so that the first adapter 300 and the second adapter 400 are respectively sealed with the packaging film 200. One end of the first adapter 300 and one end of the second adapter 400 both extend into the interior of the packaging film 200. Schematically, each first pole piece 111 is provided with a first tab 1112, each second pole piece 112 is provided with a second tab 1122, each third pole piece 121 is provided with a third tab 1212, and each fourth pole piece 122 is provided with a fourth tab 1222. Each first tab 1112 and each third tab 1212 can be welded and fixed to one end of the first adapter 300 extending into the packaging film 200, and each second tab 1122 and each fourth tab 1222 can be welded and fixed to one end of the second adapter 400 extending into the packaging film 200.

[0056] Optionally, pole piece glue is provided between the first adapter 300 and the packaging film 200 and between the second adapter 400 and the packaging film 200 to prevent contact short circuit between the adapter and the packaging film 200.

[0057] With this structure, the electrical connection between each pole piece of the battery cell 100 and the external circuit can be realized through the first adapter 300 and the second adapter 400, thereby realizing the charging and discharging of the battery.

[0058] In a specific embodiment, as Figures 3 - 9 shown, the first pole piece 111 includes a first pole piece body 1111 and a first tab 1112. First notches 1113 and 1114 are provided on the side of the first pole piece body 1111. One end of the first tab 1112 extends into the first notch 1113 and is electrically connected to the first pole piece body 1111. The second pole piece 112 includes a second pole piece body 1121 and a second tab 1122. Third notches 1123 and 1124 are provided on the side of the second pole piece body 1121. One end of the second tab 1122 extends into the third notch 1123 and is electrically connected to the second pole piece body 1121. The second notch 1114 is for the second tab 1122 to pass through, and the fourth notch 1124 is for the first tab 1112 to pass through. Each first tab 1112 and each third pole piece 121 are respectively electrically connected to the first adapter 300, and each second tab 1122 and each fourth pole piece 122 are respectively electrically connected to the second adapter 400.

[0059] Among them, the shape of each notch is rectangular. The first notch 1113 and the second notch 1114 are arranged at intervals at the end of the first pole piece body 1111 in the first direction. The third notch 1123 and the fourth notch 1124 are arranged at intervals at the end of the second pole piece body 1121 in the first direction. When the first pole piece 111 and the second pole piece 112 are stacked, the positions of the first notch 1113 and the fourth notch 1124 are opposite, and the positions of the second notch 1114 and the third notch 1123 are opposite. It can be understood that each first tab 1112 can be bent and electrically connected to the first adapter 300, and each second tab 1122 can be bent and electrically connected to the second adapter 400. Each first notch 1113 and each fourth notch 1124 define a channel for the first tab 1112 to pass through, and each second notch 1114 and each third notch 1123 define a channel for the second tab 1122 to pass through.

[0060] It is worth mentioning that the third pole piece 121 and the fourth pole piece 122 can have the same pole piece structure as that of the stacked core in the related art. Specifically, as Figure 7 shown, the third pole piece 121 includes a third pole piece body 1211 and a third tab 1212 arranged on the side of the third pole piece body 1211. The third tab 1212 is electrically connected to the third pole piece body 1211; the fourth pole piece 122 includes a fourth pole piece body 1221 and a fourth tab 1222 arranged on the side of the fourth pole piece body 1221. The fourth tab 1222 is electrically connected to the fourth pole piece body 1221.

[0061] In this structure, notches for the tabs to pass through are respectively arranged on the first pole piece 111 and the second pole piece 112, avoiding interference between the first tab 1112 and / or the second tab 1122 and the packaging film 200, and ensuring that the first tab 1112 and the second tab 1122 can be reliably electrically connected to the corresponding adapters.

[0062] In a possible implementation manner, the bottom edges of the first notch 1113 and the second notch 1114 are flush with the edge of the third pole piece 121 in the first direction.

[0063] Among them, when the bottom edge of the first notch 1113 exceeds the edge of the third pole piece 121 in the first direction, the first tab 1112 is prone to interference with the packaging film 200. When the bottom edge of the second notch 1114 exceeds the edge of the third pole piece 121 in the first direction, the second tab 1122 is prone to interference with the first pole piece 111 when passing through the second notch 1114. When the edge of the third pole piece 121 in the first direction exceeds the bottom edges of the first notch 1113 and the second notch 1114, the first pole piece 111 loses a large amount of active material at the notch position, resulting in a decrease in the energy density of the battery.

[0064] The bottom edges of the third notch 1123 and the fourth notch 1124 are flush with the edge of the fourth pole piece 122 in the first direction.

[0065] Among them, when the bottom edge of the third notch 1123 extends beyond the edge of the fourth pole piece 122 in the first direction, the second tab 1122 is prone to interference with the packaging film 200; when the bottom edge of the fourth notch 1124 extends beyond the edge of the fourth pole piece 122 in the first direction, the first tab 1112 is prone to interference with the second pole piece 112 when passing through the fourth notch 1124. When the edge of the fourth pole piece 122 in the first direction extends beyond the bottom edges of the third notch 1123 and the fourth notch 1124, the second pole piece 112 loses a large amount of active material at the notch position, resulting in a decrease in the energy density of the battery.

[0066] That is to say, the above settings can ensure that the tabs on the first pole piece 111 and the tabs on the second pole piece 112 can be reliably electrically connected to the corresponding adapters, ensuring the energy density of the battery.

[0067] Schematically, the width difference between the first notch 1113 and the first tab 1112 is greater than or equal to 0.5 mm, the width difference between the second notch 1114 and the second tab 1122 is greater than or equal to 0.5 mm, the width difference between the third notch 1123 and the second tab 1122 is greater than or equal to 0.5 mm, and the width difference between the fourth notch 1124 and the first tab 1112 is greater than or equal to 0.5 mm.

[0068] Specifically, in the direction indicated by the Y-axis, there are gaps between the first tab 1112 and the first notch 1113 and the fourth notch 1124 respectively, and the total gap between the first tab 1112 and the corresponding notch is not less than 0.5 mm; there are gaps between the second tab 1122 and the second notch 1114 and the third notch 1123 respectively, and the total gap between the second tab 1122 and the corresponding notch is not less than 0.5 mm.

[0069] Through the above settings, when the staff stacks the pole pieces in sequence, the first tab 1112 or the second tab 1122 will not interfere with the corresponding notch due to assembly tolerances, ensuring the qualification rate of the battery during production.

[0070] As Figure 4 and Figure 10 shown, in the stacking direction of the pole pieces, there is a gap H1 between the top sealing edge 230 and the first accommodating portion 210.

[0071] Specifically, in the direction indicated by the Z-axis, there is a gap between the top sealing edge 230 and the first accommodating portion 210. It can be understood that the gap between the top sealing edge 230 and the first main body portion 110 is greater than the gap between the top sealing edge 230 and the first accommodating portion 210.

[0072] It can be understood that after the battery cell 100 is placed in the packaging film 200, the top sealing edge 230 can be formed at the end of the packaging film 200 by means of heat sealing. By setting the gap H1, during the process of forming the top sealing edge 230 by heat sealing, heat is not easily transferred to the first main body portion 110 of the battery cell 100, thereby ensuring the performance of the battery.

[0073] In a specific embodiment, the gap H1 is greater than or equal to 0.5 mm. That is to say, the distance between the top sealing edge 230 and the first accommodating portion 210 is not less than 0.5 mm.

[0074] Through the above settings, during the process of forming the top sealing edge 230 by encapsulating the packaging film 200, two sealing heads can be used to close and squeeze to form the top sealing edge 230. With H1≥0.5 mm, it can ensure that one of the sealing heads can extend into the space between the top sealing edge 230 and the first accommodating portion 210, thereby ensuring the reliable formation of the top sealing edge 230. At the same time, with H1≥0.5 mm, heat is even less likely to be transferred to the first main body portion 110 of the battery cell 100, ensuring the performance of the battery.

[0075] In one embodiment, as Figures 2 - 5 and Figure 10 shown, the end of the first accommodating portion 210 in the first direction is flush with the end of the top sealing edge 230 away from the second main body portion 120.

[0076] When the end of the first accommodating portion 210 extends beyond the top sealing edge 230, the first accommodating portion 210 will cause an increase in the size of the battery in the first direction, reducing the energy density of the battery. When the length by which the top sealing edge 230 extends beyond the first accommodating portion 210 is relatively long, the space utilization rate on the side of the top sealing edge 230 is small.

[0077] Through the above settings, the first accommodating portion 210 does not increase the size of the battery. At the same time, it ensures that the space on the side of the top sealing edge 230 can accommodate more active materials, ensuring the energy density of the battery.

[0078] In one embodiment, the polarities of the electrode sheets at the end of the first main body portion 110 facing the second main body portion 120 and the electrode sheets at the end of the second main body portion 120 facing the first main body portion 110 are opposite.

[0079] Schematically, the pole piece at one end of the first main body portion 110 facing the second main body portion 120 is the negative pole piece, and the pole piece at one end of the second main body portion 120 facing the first main body portion 110 is the positive pole piece, and the positive active material of the positive pole piece covers the negative active material of the negative pole piece at the end of the first main body portion 110.

[0080] It can be understood that during the charging and discharging process of the battery, lithium ions can also migrate between the above two pole pieces, thereby ensuring the energy density of the battery.

[0081] As Figures 3 - 5 shown, the battery cell 100 further includes a separator 130, and at least one layer of separator 130 is provided between adjacent two pole pieces.

[0082] Schematically, a separator 130 is provided between the first pole piece 111 and the second pole piece 112 of the first main body portion 110, between the third pole piece 121 and the fourth pole piece 122 of the second main body portion 120, and between the first main body portion 110 and the second main body portion 120. In a possible implementation manner, notches for the first pole ear 1112 and the second pole ear 1122 to pass through can be respectively opened on the separator 130 between the first pole piece 111 and the second pole piece 112 and on the separator 130 between the first main body portion 110 and the second main body portion 120.

[0083] By providing the separator 130, direct contact between the positive pole piece and the negative pole piece of the battery cell 100 is avoided, thereby preventing short circuit.

[0084] This application also provides an electrical device, including the above battery. Exemplarily, the electrical device can be a consumer electronic product. For the electrical device provided by this application, since the energy density of the battery is higher, the battery can store more energy, which is beneficial to improving the battery life of the electrical device.

[0085] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit it; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some 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 this application.

Claims

1. A battery, characterized in that, It includes an electrode core and a packaging film wrapped around the outside of the electrode core; The electrode core includes a first main body portion and a second main body portion stacked, the first main body portion includes at least one first pole piece and at least one second pole piece stacked alternately, the second main body portion includes at least one third pole piece and at least one fourth pole piece stacked alternately, the edge of the first main body portion in the first direction extends beyond the second main body portion, and the tab ears of each pole piece are configured for external electrical connection; The packaging film includes a first accommodating portion and a second accommodating portion, the edge of the first accommodating portion in the first direction extends beyond the second accommodating portion, the first main body portion is located inside the first accommodating portion, the second main body portion is located inside the second accommodating portion, a top sealing edge is provided at the end of the second accommodating portion in the first direction, and the part of the first accommodating portion that extends beyond the second accommodating portion is located on one side of the top sealing edge.

2. The battery according to claim 1, wherein The battery further includes a first adapter and a second adapter, the top sealing edge respectively wraps the middle parts of the first adapter and the second adapter, each of the first pole pieces and each of the third pole pieces are electrically connected to the first adapter respectively, and each of the second pole pieces and each of the fourth pole pieces are electrically connected to the second adapter respectively.

3. The battery according to claim 2, characterized in that, The first pole piece includes a first pole piece main body and a first tab ear, a first notch and a second notch are provided on the side of the first pole piece main body, and one end of the first tab ear extends into the first notch and is electrically connected to the first pole piece main body; The second pole piece includes a second pole piece main body and a second tab ear, a third notch and a fourth notch are provided on the side of the second pole piece main body, and one end of the second tab ear extends into the third notch and is electrically connected to the second pole piece main body; The second notch is for the second tab ear to pass through, the fourth notch is for the first tab ear to pass through, each of the first tab ears and each of the third pole pieces are electrically connected to the first adapter respectively, and each of the second tab ears and each of the fourth pole pieces are electrically connected to the second adapter respectively.

4. The battery according to claim 3, characterized in that, The bottom edges of the first notch and the second notch are flush with the edge of the third pole piece in the first direction; and / or, The bottom edges of the third notch and the fourth notch are flush with the edge of the fourth pole piece in the first direction.

5. The battery according to claim 3, characterized in that, The width difference between the first notch and the first tab ear is greater than or equal to 0.5 mm, the width difference between the second notch and the second tab ear is greater than or equal to 0.5 mm, the width difference between the third notch and the second tab ear is greater than or equal to 0.5 mm, and the width difference between the fourth notch and the first tab ear is greater than or equal to 0.5 mm.

6. The battery according to claim 1, characterized in that, In the stacking direction of the pole pieces, there is a gap between the top sealing edge and the first accommodating portion.

7. The battery according to claim 6, characterized in that, The gap is greater than or equal to 0.5 mm.

8. The battery according to claim 1, characterized in that, The end of the first accommodating portion in the first direction is flush with the end of the top sealing edge away from the second main body portion.

9. The battery according to claim 1, wherein The pole pieces at the end of the first main body portion facing the second main body portion are opposite in polarity to the pole pieces at the end of the second main body portion facing the first main body portion.

10. The battery according to any one of claims 1-9, characterized in that, The battery cell further includes a separator, and at least one layer of the separator is disposed between two adjacent electrode plates.

11. An electrical device, characterized in that, A battery comprising any one of claims 1-10.

Images