Battery and electronic device

Abstract

The utility model discloses a battery and electronic equipment, and belongs to the technical field of battery production. The battery comprises a battery cell and a packaging part, the at least one first tab is directly welded with the pole piece, and the sealing element is arranged on the first tab, so that the sealing element can form tight sealing connection with the side sealing edge in the packaging part. Therefore, the need of additionally arranging a welding tab with a hot melting structure in the prior art can be avoided. Therefore, under the condition that the packaging size of the soft package is fixed, the available space of the battery cell is utilized to the maximum extent, so that the volume of the battery cell can be increased, and the capacity of the whole battery can be further improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery and electronic device. Background Technology

[0002] A battery is the core energy storage unit of an electronic device, mainly consisting of a positive electrode and a negative electrode, and a separator located between the positive and negative electrodes. The positive electrode has multiple evenly arranged positive tabs on one side, and the negative electrode has multiple evenly arranged negative tabs on the other side. These tabs allow for the input and output of current.

[0003] In battery manufacturing, encapsulation technology typically plays a crucial role. Currently, three main encapsulation technologies are used: cylindrical, prismatic, and pouch. Compared to cylindrical and prismatic encapsulation, pouch encapsulation offers advantages such as better safety, lighter weight, and more flexible design. Pouch-encapsulated batteries use an aluminum-plastic composite film as the outer shell, encapsulating the battery within the film. The polymer layer on the inner side of the film melts when heated, forming a seal that encapsulates the battery.

[0004] However, with a fixed pouch package size, the internal battery cells are relatively small, resulting in a smaller battery capacity. Utility Model Content

[0005] This application provides a battery and an electronic device that can solve the problem of small battery capacity in the prior art. The technical solution is as follows:

[0006] On the one hand, a battery is provided, comprising:

[0007] Battery cells and packaging;

[0008] The battery cell includes: an electrode sheet wound into one piece, and at least one first tab welded to one side of the electrode sheet;

[0009] The encapsulation part includes: an encapsulation bag and a side sealing edge connected to one side of the encapsulation bag; the encapsulation bag wraps the electrode sheet, the side sealing edge wraps a portion of the first electrode tab, and another portion of the first electrode tab extends out of the encapsulation part through the side sealing edge;

[0010] The first electrode tab has a sealing element that is fitted onto the first electrode tab, and the first electrode tab is sealed to the side sealing edge through the sealing element.

[0011] Optionally, the electrode includes: an electrode body, and an active material layer coated on the surface of the electrode body; the active material layer has a hollow area, and the first electrode tab is welded to the electrode body through the hollow area.

[0012] Optionally, the battery cell further includes: a plurality of second tabs connected to one side of the electrode sheet, wherein the plurality of second tabs are welded together as a single unit;

[0013] In cases where there are multiple first electrode tabs, the multiple first electrode tabs are welded together as one unit.

[0014] Optionally, in the arrangement direction of the electrode sheet and the first electrode tab, the length of the second electrode tab welded together is less than the length of the first electrode tab welded together.

[0015] The second electrode tab, which is welded as a single unit, is located inside the encapsulation section.

[0016] Optionally, the second electrode tab, which is welded together, and the first electrode tab, which is welded together, are located on the same side of the electrode sheet;

[0017] Alternatively, the second electrode tab, which is welded together, and the first electrode tab, which is welded together, are located on opposite sides of the electrode sheet.

[0018] Optionally, when the second electrode tab welded together and the first electrode tab welded together are located on the same side of the electrode sheet, the second electrode tab welded together and the first electrode tab welded together are arranged alternately.

[0019] Optionally, there are two electrodes, namely a positive electrode and a negative electrode; the first tab connected to the positive electrode is the first positive electrode tab, and the second tab connected to the positive electrode is the second positive electrode tab; the first tab connected to the negative electrode is the first negative electrode tab, and the second tab connected to the negative electrode is the second negative electrode tab.

[0020] The first positive electrode tab and the first negative electrode tab, which are welded together as one piece, are both distributed between the second positive electrode tab and the second negative electrode tab, which are welded together as one piece.

[0021] Optionally, when the second electrode tab welded together and the first electrode tab welded together are located on opposite sides of the electrode sheet, the center line of the second electrode tab welded together coincides with the center line of the first electrode tab welded together.

[0022] Optionally, the plurality of second tabs and the electrode plates are integrally formed.

[0023] On the other hand, an electronic device is provided, comprising:

[0024] The device body, and a battery installed in the device body, wherein the battery is any of the batteries described above.

[0025] The beneficial effects of the technical solutions provided in this application include at least the following:

[0026] Because at least one first tab is directly welded to the electrode sheet, and the first tab is equipped with a seal that can form a tight seal with the side seal in the package, the need for additional welded tabs with heat-fusion structures, as required in the prior art, can be avoided. Thus, with a fixed pouch package size, the available space of the cell is maximized, thereby increasing the cell volume and consequently improving the overall battery capacity. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of a battery;

[0029] Figure 2 This is a schematic diagram of the structure of a battery provided in an embodiment of this application;

[0030] Figure 3 yes Figure 2 A cross-sectional view of the battery is shown;

[0031] Figure 4 This is a partial schematic diagram of an electrode sheet after being unfolded, as provided in an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of another battery structure provided in an embodiment of this application;

[0033] Figure 6 This is a partial schematic diagram of another electrode sheet provided in the embodiments of this application after being unfolded;

[0034] Figure 7 This is a schematic diagram of the structure of another battery provided in the embodiments of this application;

[0035] Figure 8 This is a partial schematic diagram of another electrode sheet provided in the embodiments of this application after being unfolded;

[0036] Figure 9 This is a schematic diagram of another battery structure provided in the embodiments of this application. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0038] Please refer to Figure 1 , Figure 1 This is a cross-sectional view of a battery. The battery 00 may include: a cell 10, and an encapsulation portion 20 that encloses the cell 10.

[0039] The cell 10 in the battery 00 may include: an electrode 11 wound as one piece, and a plurality of tabs 12 connected to one side of the electrode 11. It should be noted that the tabs 12 are made of metal material, with one end tightly attached to the electrode 11, and the other end usually needs to extend to the outside of the package 20 in order to establish an electrical connection with the external circuit.

[0040] The encapsulation section 20 in the battery 00 protects the cell 10 from external environmental influences. The encapsulation section 20 uses an aluminum-plastic film material, which is composed of an outer aluminum layer and an inner hot-melt layer (PP, i.e., polypropylene). During the battery 00 encapsulation process, heating melts the inner hot-melt layer of the aluminum-plastic film, causing the various parts of the film to adhere tightly and form a stable sealed structure, thus achieving battery 00 encapsulation. However, since the surface of the tab 12 lacks a structure compatible with the hot-melt layer of the aluminum-plastic film, it cannot be directly connected to the aluminum-plastic film via hot-melt bonding. Therefore, an adapter welding technique is typically used, where the tab 12 is first welded to a specially designed welding tab 01, which extends out of the encapsulation section 20 to establish an electrical connection with an external circuit. This welding tab 01 is equipped with a hot-melt structure 011 compatible with the hot-melt layer of the aluminum-plastic film. During the encapsulation process, heating fuses the hot-melt structure 011 on the welding tab 01 with the hot-melt layer of the aluminum-plastic film, thereby achieving overall sealing of the battery 00.

[0041] However, with a fixed pouch size, the additional welding tabs 01 equipped with a heat-fusion structure 011 compress the available space of the internal cells 10 of the pouch, resulting in a smaller battery capacity.

[0042] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery provided in an embodiment of this application. The battery 000 may include: a cell 100 and a package 200.

[0043] The cell 100 in the battery 000 may include: an electrode 101 wound integrally, and at least one first tab 102 welded to one side of the electrode 101. For example, the cell 100 may be a lithium battery cell.

[0044] The encapsulation portion 200 in the battery 000 may include: an encapsulation bag 201, and a side seal 202 connected to one side of the encapsulation bag 201. The encapsulation bag 201 may wrap the electrode 101, the side seal 202 may wrap a portion of the first electrode tab 102, and another portion of the first electrode tab 102 may extend out of the encapsulation portion 200 through the side seal 202. For example, the encapsulation portion 200 may be a soft bag made of aluminum-plastic film.

[0045] To see the structure of the first electrode 102 more clearly, please refer to... Figure 3 , Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the battery. The first tab 102 in the cell 100 may have a seal 1021 fitted onto the first tab 102, and the first tab 102 may be sealed to the side sealing edge 202 in the encapsulation portion 200 via the seal 1021. For example, the seal 1021 may be made of PP material (i.e., polypropylene) and has a certain degree of stickiness after being heated.

[0046] In this embodiment, since at least one first tab 102 is directly welded to the electrode 101, and the first tab 102 is equipped with a seal 1021, which can form a tight sealed connection with the side sealing edge 202 in the package 200, the need for additional welded tabs with heat-fusion structures, as required in the prior art, can be avoided. Thus, with a fixed pouch package size, the available space of the cell 100 is maximized, thereby increasing the volume of the cell 100 and consequently improving the overall capacity of the battery 000.

[0047] In summary, this application provides a battery comprising a cell and a packaging section. Since at least one first tab is directly welded to an electrode sheet, and a sealing element is provided on the first tab, this sealing element can form a tight, sealed connection with the side sealing edge in the packaging section. Therefore, the need for additional welded tabs with heat-fusion structures, as required in the prior art, can be avoided. Thus, with a fixed pouch package size, the available space of the cell is maximized, thereby increasing the cell volume and consequently improving the overall battery capacity.

[0048] In the embodiments of this application, please refer to Figure 4 , Figure 4 This is a partial schematic diagram of an electrode sheet after unfolding, according to an embodiment of this application. The electrode sheet 101 in the battery cell 100 may include: an electrode sheet body 1011 and an active material layer 1012 coated on the surface of the electrode sheet body 1011. The active material layer 1012 may have a hollow area K, and the first tab 102 can be soldered to the electrode sheet body 1011 through the hollow area K.

[0049] In this case, at the hollowed-out area K, the electrode body 1011 can serve as a fixing point for welding the first tab 102, so that the first tab 102 is firmly fixed on the electrode body 1011, thereby enabling the current in the cell 100 to establish an electrical connection with the external circuit through the first tab 102, improving the current transmission efficiency and making the overall reliability of the battery 000 higher.

[0050] Optional, please refer to Figure 5 , Figure 5 This is a schematic diagram of another battery structure provided in an embodiment of this application. The cell 100 in the battery 000 may further include: a plurality of second tabs 103 connected to one side of the electrode 101, and the plurality of second tabs 103 are welded together as one unit.

[0051] In cases where there are multiple first tabs 102 in the battery cell 100, the multiple first tabs 102 are welded together as one unit.

[0052] In this configuration, multiple first tabs 102 and multiple second tabs 103 are welded together. When current flows from the first tabs 102 into the electrode 101, some of the current also flows to the second tabs 103. Furthermore, since the multiple second tabs 103 are welded together, the current can quickly diffuse to each layer of electrode 101 connected to all the second tabs 103, thereby shortening the current path, reducing the resistance encountered during current flow, and resulting in less heat generation due to resistance. Moreover, the lower internal resistance effectively reduces energy loss as heat, allowing more charging current to be directly used in the charging process of the battery 000, thus accelerating the charging speed of the battery 000. In addition, with the increased number of tabs, the battery 000 can be charged simultaneously at multiple locations, further improving the charging efficiency of the battery 000.

[0053] In the embodiments of this application, such as Figure 5 As shown, in the arrangement direction of the electrode 101 and the first electrode tab 102 in the battery cell 100, the length of the second electrode tab 103, which is welded together, is less than the length of the first electrode tab 102, which is welded together.

[0054] The second electrode tab 103, which is welded as a whole, is located inside the packaging section 200.

[0055] In this configuration, since the second tab 103 is located within the encapsulation portion 200 and is relatively short, the encapsulation process of the battery 000 can be simplified, reducing encapsulation difficulties that might arise from an excessively long second tab 103 and improving production efficiency. Furthermore, although the second tab 103 is short, because they are welded together, effective current conduction is still ensured, and the internal resistance is further reduced by minimizing unnecessary material length.

[0056] In the embodiments of this application, the first electrode tab 102 and the second electrode tab 103, which are welded together, have various arrangement schemes on the electrode sheet 101. For clarity, the embodiments of this application will be illustrated using the following two optional implementation methods as examples:

[0057] For the first optional implementation method, please refer to... Figure 6 , Figure 6 This is a partial schematic diagram of another electrode sheet provided in this application embodiment after unfolding. The second electrode tab 103, which is welded together, and the first electrode tab 102, which is welded together, are located on the same side of the electrode sheet 101. In this way, space at the bottom of the battery 000 can be saved, the internal space utilization of the battery 000 can be improved, and the entire battery 000 structure can be made more compact.

[0058] For example, such as Figure 5 As shown, the second tab 103, which is welded together, and the first tab 102, which is welded together, are arranged alternately. This makes the welding operation between the tabs easier, reduces the space constraints that may be encountered during the welding process, and improves the production efficiency of the battery 000.

[0059] Optional, please refer to Figure 7 , Figure 7 This is a schematic diagram of another battery structure provided in an embodiment of this application. There are two electrodes 101, namely a positive electrode and a negative electrode. Specifically, the first tab 102 connected to the positive electrode is the first positive tab 102a, and the second tab 103 connected to the positive electrode is the second positive tab 103a; the first tab 102 connected to the negative electrode is the first negative tab 102b, and the second tab 103 connected to the negative electrode is the second negative tab 103b.

[0060] The first positive electrode tab 102a and the first negative electrode tab 102b, which are welded together, are both distributed between the second positive electrode tab 103a and the second negative electrode tab 103b, which are welded together.

[0061] In this case, it can be ensured that the current is more evenly distributed inside the cell 100, avoiding excessive local current density, reducing local heating, and improving current transmission efficiency.

[0062] For the second optional implementation method, please refer to... Figure 8 , Figure 8 This is a partial schematic diagram of another electrode sheet provided in this application embodiment after being unfolded. The second electrode tab 103 and the first electrode tab 102, which are welded together, are located on opposite sides of the electrode sheet 101.

[0063] For example, please refer to Figure 9, Figure 9 This is a schematic diagram of another battery structure provided in an embodiment of this application. The center line of the second electrode 103, which is welded together, coincides with the center line of the first electrode 102, which is welded together.

[0064] In this case, by distributing the second electrode tab 103, which is welded together, and the first electrode tab 102, which is welded together, on opposite sides of the electrode 101 and keeping their center lines aligned, the uniform distribution of current inside the cell 100 is ensured, excessive local current density is avoided, heat generation and internal resistance are reduced, and current transmission efficiency is improved.

[0065] Optionally, the multiple second tabs 103 and electrode plates 101 in the battery cell 100 can be an integrally formed structure.

[0066] In this configuration, the welding connection between the second tab 103 and the electrode 101 can be eliminated. This not only reduces the risk of mechanical failure due to poor welding and enhances the stability of the overall structure, but also ensures a seamless connection between the second tab 103 and the electrode 101, reducing internal resistance and heat generation. Furthermore, the one-piece molding technology simplifies the production process, reduces assembly steps, lowers production costs, and increases the level of automation in production.

[0067] In summary, this application provides a battery comprising a cell and a packaging section. Since at least one first tab is directly welded to an electrode sheet, and a sealing element is provided on the first tab, this sealing element can form a tight, sealed connection with the side sealing edge in the packaging section. Therefore, the need for additional welded tabs with heat-fusion structures, as required in the prior art, can be avoided. Thus, with a fixed pouch package size, the available space of the cell is maximized, thereby increasing the cell volume and consequently improving the overall battery capacity.

[0068] This application also provides an electronic device, which can be a smartphone, laptop, or e-reader, etc. The electronic device may include: a device body (not shown), and a battery installed within the device body. The battery is the battery 000 described in the above embodiments, and the battery 000 can be used to supply power to the device body.

[0069] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0070] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, include: Battery cell (100) and packaging section (200); The battery cell (100) includes: an electrode sheet (101) wound into one piece, and at least one first tab (102) welded to one side of the electrode sheet (101); The encapsulation part (200) includes: an encapsulation bag (201) and a side seal (202) connected to one side of the encapsulation bag (201); the encapsulation bag (201) wraps the electrode (101), the side seal (202) wraps a portion of the first electrode tab (102), and another portion of the first electrode tab (102) extends out of the encapsulation part (200) through the side seal (202); The first electrode tab (102) has a sealing element (1021) sleeved on the first electrode tab (102), and the first electrode tab (102) is sealed to the side sealing edge (202) through the sealing element (1021).

2. The battery according to claim 1, characterized in that, The electrode (101) includes: an electrode body (1011) and an active material layer (1012) coated on the surface of the electrode body (1011); the active material layer (1012) has a hollow area (K), and the first electrode tab (102) is welded to the electrode body (1011) through the hollow area (K).

3. The battery according to claim 1 or 2, characterized in that, The battery cell (100) further includes: a plurality of second tabs (103) connected to one side of the electrode (101), wherein the plurality of second tabs (103) are welded together as a whole; In cases where there are multiple first electrode tabs (102), the multiple first electrode tabs (102) are welded together as one unit.

4. The battery according to claim 3, characterized in that, In the arrangement direction of the electrode sheet (101) and the first electrode tab (102), the length of the second electrode tab (103) welded together is less than the length of the first electrode tab (102) welded together. The second electrode tab (103), which is welded as a whole, is located inside the encapsulation part (200).

5. The battery according to claim 4, characterized in that, The second electrode tab (103), which is welded together, and the first electrode tab (102), which is welded together, are located on the same side of the electrode plate (101); Alternatively, the second electrode tab (103) welded together and the first electrode tab (102) welded together are located on opposite sides of the electrode plate (101).

6. The battery according to claim 5, characterized in that, When the second electrode tab (103) and the first electrode tab (102) which are welded together are located on the same side of the electrode plate (101), the second electrode tab (103) and the first electrode tab (102) which are welded together are arranged at intervals.

7. The battery according to claim 6, characterized in that, There are two electrodes, namely a positive electrode and a negative electrode; the first electrode tab (102) connected to the positive electrode is the first positive electrode tab (102a), and the second electrode tab (103) connected to the positive electrode is the second positive electrode tab (103a); the first electrode tab (102) connected to the negative electrode is the first negative electrode tab (102b), and the second electrode tab (103) connected to the negative electrode is the second negative electrode tab (103b). The first positive electrode tab (102a) and the first negative electrode tab (102b), which are welded together, are both distributed between the second positive electrode tab (103a) and the second negative electrode tab (103b), which are welded together.

8. The battery according to claim 5, characterized in that, When the second electrode tab (103) and the first electrode tab (102) which are welded together are located on opposite sides of the electrode plate (101), the center line of the second electrode tab (103) and the center line of the first electrode tab (102) which are welded together coincide.

9. The battery according to any one of claims 4 to 8, characterized in that, The plurality of second tabs (103) and the electrode (101) are integrally formed.

10. An electronic device, characterized in that, include: The device body, and the battery installed in the device body, wherein the battery is the battery according to any one of claims 1-9 (000).

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