Battery pole piece and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pole piece and a battery. The battery pole piece comprises a pole piece main body, a first tab and a second tab, wherein the pole piece main body comprises a first edge and a second edge which are adjacently arranged and connected; the first tab is connected to the first side; the second tab is connected to the second side, and the polarity of the first tab is the same as that of the second tab. By respectively arranging the first tab and the second tab on the first edge and the second edge which are adjacently arranged on the pole piece main body, the number of the tabs can be increased, so that the area of the tabs is increased, the current conduction speed of the battery is improved, the rate capability of the battery is improved, and the battery can be prevented from heating due to passing of large current; therefore, the use safety of the battery is ensured; in addition, the arrangement is also beneficial to subsequent welding of the first tab and the second tab with the corresponding metal foils and collection and lead-out of current.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pole piece and a battery. Background Art

[0002] With the rapid development of science and technology, electronic products are becoming increasingly popular. From smartphones and tablets to electric vehicles, batteries are the core power source of these devices. Their performance and safety are directly related to the overall performance and user experience of the products.

[0003] Batteries typically include multiple positive and negative electrodes stacked alternately in sequence, with a separator interposed between adjacent positive and negative electrodes to prevent direct contact between the positive and negative electrodes, which can cause short circuits. The positive electrode comprises a main body and a positive tab connected to one side of the main body, while the negative electrode comprises a main body and a negative tab connected to one side of the main body. The positive and negative tabs are used to electrically connect to an external electrical device to facilitate current conduction between the battery and the external device, thereby providing power to the external device. However, the current conduction rate is often limited by the area of ​​the tabs. The tab area in existing technologies is relatively small, resulting in a low current conduction rate, which affects the battery's rate performance. Furthermore, the battery is prone to heat generation when a large current passes through it, impacting the battery's safety performance.

[0004] Therefore, there is an urgent need to propose a battery electrode to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a battery electrode and a battery, which can increase the current conduction speed of the battery, enhance the battery's rate performance, and avoid the battery from heating up due to large current passing through, thereby ensuring the safety of the battery.

[0006] To achieve this purpose, the technical solution adopted in this utility model is:

[0007] A battery electrode, comprising:

[0008] The pole piece body comprises a first side and a second side which are adjacently arranged and connected;

[0009] a first tab connected to the first side;

[0010] The second electrode tab is connected to the second side, and the first electrode tab and the second electrode tab have the same polarity.

[0011] As a preferred solution, the number of the first electrode tabs is at least two, and the at least two first electrode tabs are spaced apart along the length direction of the first side; and / or

[0012] The number of the second electrode tabs is at least two, and the at least two second electrode tabs are spaced apart along the length direction of the second side.

[0013] As a preferred solution, the distances between two adjacent first electrode tabs are equal or unequal; and / or the distances between two adjacent second electrode tabs are equal or unequal.

[0014] As a preferred solution, the first electrode tab is a strip structure, and the length of the first electrode tab is equal to the length of the first side; and / or

[0015] The second electrode tab is a strip-shaped structure, and the length of the second electrode tab is equal to the length of the second side.

[0016] As a preferred solution, the first electrode tab and the second electrode tab are electrically connected via a conductive component.

[0017] As a preferred embodiment, the conductive component includes a first metal foil, a second metal foil and a conductive connector, the first metal foil is electrically connected to the first tab, the second metal foil is electrically connected to the second tab, one end of the conductive connector is electrically connected to the first metal foil, and the other end of the conductive connector is electrically connected to the second metal foil; or

[0018] The conductive component includes an L-shaped metal foil, one end of the metal foil is electrically connected to the first electrode tab, and the other end of the metal foil is electrically connected to the second electrode tab.

[0019] As a preferred embodiment, the first tab includes a first connecting portion and a first welding portion connected to each other, an end of the first connecting portion facing away from the first welding portion is connected to the first edge, and the first welding portion is used to electrically connect to the first metal foil;

[0020] The second electrode tab includes a second connecting portion and a second welding portion connected to each other. An end of the second connecting portion facing away from the second welding portion is connected to the second edge. The second welding portion is used to electrically connect to the second metal foil.

[0021] As a preferred solution, the area of ​​the first welding portion accounts for 50% to 98% of the total area of ​​the first tab; and / or

[0022] The area of ​​the second welding portion accounts for 50% to 98% of the total area of ​​the second electrode tab.

[0023] As a preferred solution, the height of the first electrode tab is 2 mm to 20 mm; and / or the height of the second electrode tab is 2 mm to 20 mm.

[0024] The present invention also provides a battery, comprising a positive electrode sheet, a negative electrode sheet and a separator, wherein a plurality of the positive electrode sheets and a plurality of the negative electrode sheets are alternately stacked in sequence, and a separator is provided between each adjacent positive electrode sheet and negative electrode sheet, and at least one of the positive electrode sheet and the negative electrode sheet adopts the battery electrode sheet described above;

[0025] The first side of the positive electrode sheet is arranged opposite to the first side of the negative electrode sheet, and the second side of the positive electrode sheet is arranged opposite to the second side of the negative electrode sheet.

[0026] The beneficial effects of the utility model are:

[0027] The utility model provides a battery electrode and a battery, wherein the battery electrode comprises a electrode body, a first electrode tab, and a second electrode tab. The electrode body comprises a first side and a second side adjacently disposed and connected; the first electrode tab is connected to the first side; the second electrode tab is connected to the second side, and the polarity of the first electrode tab and the second electrode tab are the same. By respectively arranging the first electrode tab and the second electrode tab on the adjacent first side and the second side of the electrode body, the number of electrode tabs can be increased, thereby increasing the electrode tab area, thereby increasing the current conduction speed of the battery, improving the battery's rate performance, and preventing the battery from heating due to the passage of large current, thereby ensuring the safety of the battery. In addition, this arrangement is also conducive to the subsequent welding of the first electrode tab and the second electrode tab to the corresponding metal foil, as well as the current aggregation and extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a battery electrode provided in Example 1 of the present utility model;

[0029] Figure 2 This is a schematic structural diagram of a battery electrode and a conductive component provided in the first embodiment of the present invention;

[0030] Figure 3 This is a schematic structural diagram of a battery electrode provided in the second embodiment of the present invention;

[0031] Figure 4 This is a schematic structural diagram of a battery electrode and a conductive component provided in the second embodiment of the present invention;

[0032] Figure 5 This is a schematic structural diagram of a battery electrode provided in the third embodiment of the present invention;

[0033] Figure 6 This is a schematic structural diagram of a battery provided in a fourth embodiment of the present utility model at one viewing angle;

[0034] Figure 7 This is a schematic structural diagram of the battery provided in Example 4 of the present utility model from another perspective.

[0035] In the picture:

[0036] 100, positive electrode sheet; 200, negative electrode sheet; 300, diaphragm;

[0037] 10. First electrode tab; 101. First connecting portion; 102. First welding portion;

[0038] 20, second tab; 201, second connecting portion; 202, second welding portion;

[0039] 30. Pole body; 301. First side; 302. Second side;

[0040] 40. Conductive component; 401. First metal foil; 402. Second metal foil; 403. Conductive connector. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0042] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] Example 1

[0046] Figure 1 FIG. 1 shows a schematic diagram of the structure of the battery electrode provided in this embodiment. Figure 1 As shown, this embodiment provides a battery electrode sheet, which includes a electrode sheet body 30, a first electrode tab 10, and a second electrode tab 20. The electrode sheet body 30 includes a first side 301 and a second side 302 disposed adjacently and connected to each other. The first electrode tab 10 is connected to the first side 301; the second electrode tab 20 is connected to the second side 302, and the first electrode tab 10 and the second electrode tab 20 have the same polarity. By respectively disposing the first electrode tab 10 and the second electrode tab 20 on the adjacent first side 301 and the second side 302 of the electrode sheet body 30, the number of electrode tabs can be increased, thereby increasing the electrode tab area, thereby improving the current conduction speed of the battery and enhancing the battery's rate performance. It can also prevent the battery from heating due to the passage of large current, thereby ensuring the battery's safety. In addition, this arrangement also facilitates the subsequent welding of the first electrode tab 10 and the second electrode tab 20 to the corresponding metal foil and the current aggregation and extraction.

[0047] To further increase the tab area, in this embodiment, there are at least two first tabs 10, which are spaced apart along the length of the first side 301. There are at least two second tabs 20, which are spaced apart along the length of the second side 302. By providing a gap between two adjacent first tabs 10 and two adjacent second tabs 20, space is reserved for the expansion of the first and second tabs 10, 20 during rolling, thereby ensuring the rolling effect of the battery electrode sheet and the quality of the finished product.

[0048] Optionally, the gap between two adjacent first tabs 10 is 1 mm to 2 mm. This gap reserves sufficient space for the extension of the first tabs 10 and can maximize the number of first tabs 10 and their length in the length direction of the first side 301, thereby further increasing the current conduction speed of the battery by increasing the tab area. For example, the gap between two adjacent first tabs 10 can be 1.05 mm, 1.10 mm, 1.15 mm, 1.20 mm, 1.25 mm, 1.30 mm, 1.35 mm, 1.40 mm, 1.45 mm, 1.50 mm, 1.55 mm, 1.60 mm, 1.65 mm, 1.70 mm, 1.75 mm, 1.80 mm, 1.85 mm, 1.90 mm, 1.95 mm, etc. This embodiment does not limit the gap between two adjacent first tabs 10, and designers can adjust it according to actual needs. It should be noted that in this embodiment, the spacing between two adjacent first electrode tabs 10 is equal to facilitate processing. Of course, in other embodiments, the spacing between two adjacent first electrode tabs 10 can also be set to be unequal, that is, the spacing between two adjacent first electrode tabs 10 can be set to be unequal, or the spacing between some adjacent first electrode tabs 10 is unequal, while the spacing between the remaining adjacent first electrode tabs 10 is equal. This embodiment is not limited to this.

[0049] Optionally, the gap between two adjacent second pole tabs 20 is 1 mm to 2 mm. This gap reserves sufficient space for the extension of the second pole tabs 20 and can maximize the number of second pole tabs 20 and their length in the length direction of the second side 302, thereby further increasing the current conduction speed of the battery by increasing the pole tab area. For example, the gap between two adjacent second pole tabs 20 can be 1.05 mm, 1.10 mm, 1.15 mm, 1.20 mm, 1.25 mm, 1.30 mm, 1.35 mm, 1.40 mm, 1.45 mm, 1.50 mm, 1.55 mm, 1.60 mm, 1.65 mm, 1.70 mm, 1.75 mm, 1.80 mm, 1.85 mm, 1.90 mm, 1.95 mm, etc. This embodiment does not limit the gap between two adjacent second pole tabs 20, and designers can adjust it according to actual needs. It should be noted that in this embodiment, the spacing between two adjacent second pole tabs 20 is equal to facilitate processing. Of course, in other embodiments, the spacing between two adjacent second pole tabs 20 can also be set to be unequal, that is, the spacing between two adjacent second pole tabs 20 can be set to be unequal, or the spacing between some adjacent second pole tabs 20 is unequal, while the spacing between the remaining adjacent second pole tabs 20 is equal. This embodiment is not limited to this.

[0050] It should be noted that in this embodiment, the spacing between two adjacent first tabs 10 and the spacing between two adjacent second tabs 20 are preferably equal to facilitate processing and assembly. Of course, this embodiment is not limited to this. In other embodiments, the spacing between two adjacent first tabs 10 and the spacing between two adjacent second tabs 20 can also be set to be unequal.

[0051] like Figure 1 As shown, in this embodiment, the height of the first tab 10 is 2 mm to 20 mm. This is to reduce the height of the first tab 10 while ensuring that the battery electrode has a large tab area, thereby preventing damage during use. For example, the height of the first tab 10 can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, etc. This embodiment does not limit the height of the first tab 10, and designers can adjust it according to actual needs.

[0052] The height of the second tab 20 is 2 mm to 20 mm. This is to reduce the height of the second tab 20 while ensuring that the battery electrode has a large tab area, thereby preventing damage during use. For example, the height of the second tab 20 can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, etc. This embodiment does not limit the height of the second tab 20, and designers can adjust it according to actual needs.

[0053] Figure 2 FIG. 4 shows a schematic structural diagram of the battery electrode and the conductive component 40 provided in this embodiment. Figure 2 and combined Figure 1As shown, in order to realize the current aggregation and extraction of the first electrode tab 10 and the second electrode tab 20, the first electrode tab 10 and the second electrode tab 20 are electrically connected through a conductive component 40. Specifically, in this embodiment, the conductive component 40 includes a first metal foil 401, a second metal foil 402 and a conductive connector 403. The first metal foil 401 is electrically connected to the first electrode tab 10; the second metal foil 402 is electrically connected to the second electrode tab 20; one end of the conductive connector 403 is electrically connected to the first metal foil 401, and the other end of the conductive connector 403 is electrically connected to the second metal foil 402. In particular, multiple first tabs 10 are electrically connected to the first metal foil 401, and multiple second tabs 20 are electrically connected to the second metal foil 402. The first metal foil 401 and the second metal foil 402 are then electrically connected via a conductive connector 403, ultimately summing and leading the current on the first tab 10 and the second tab 20. This arrangement can facilitate the electrical connection of the battery to external electrical devices and ensure the battery's performance. Optionally, in this example, the conductive connector 403 is an L-shaped structure, which is easy to process and can easily connect the first metal foil 401 and the second metal foil 402.

[0054] Optionally, the length of the first metal foil 401 is equal to the length of the first side 301, and the length of the second metal foil 402 is equal to the length of the second side 302, so as to increase the contact area between the first metal foil 401 and the first pole tab 10 and between the second metal foil 402 and the second pole tab 20, thereby further improving the stability of current flow.

[0055] In other embodiments, the conductive component 40 may only include an L-shaped metal foil, one end of the metal foil is electrically connected to the first electrode tab 10, and the other end of the metal foil is electrically connected to the second electrode tab 20. This can also achieve the above-mentioned effect, save materials for the conductive component 40, and reduce processing costs.

[0056] like Figure 1-Figure 2As shown, the first tab 10 includes a first connecting portion 101 and a first welding portion 102, one end of the first connecting portion 101 facing away from the first welding portion 102 being connected to the first edge 301. The first welding portion 102 is used to electrically connect to the first metal foil 401. In this embodiment, the first welding portion 102 and the first metal foil 401 are connected by welding, which facilitates processing and provides a stable connection. Optionally, the area of ​​the first welding portion 102 accounts for 50% to 98% of the total area of ​​the first tab 10. This arrangement can increase the contact area between the first welding portion 102 and the first metal foil 401, ensuring a stable connection between the first tab 10 and the first metal foil 401. It can also prevent deformation of the battery electrode due to welding, ensure the flatness of the battery electrode, and improve the safety and performance of the battery. For example, the area of ​​the first welding portion 102 may account for 55%, 56%, 58%, 60%, 62%, 65%, 66%, 68%, 70%, 72%, 75%, 76%, 78%, 80%, 82%, 85%, 86%, 88%, 90%, 92%, 95%, etc. of the total area of ​​the first electrode tab 10. This embodiment does not limit this, and designers can adjust the area of ​​the first welding portion 102 to account for the total area of ​​the first electrode tab 10 according to actual needs.

[0057] The second tab 20 includes a second connecting portion 201 and a second welding portion 202. The end of the second connecting portion 201 facing away from the second welding portion 202 is connected to the second edge 302. The second welding portion 202 is used to electrically connect to the second metal foil 402. In this embodiment, the second welding portion 202 and the second metal foil 402 are connected by welding, which facilitates processing and provides a stable connection. Optionally, the area of ​​the second welding portion 202 accounts for 50% to 98% of the total area of ​​the second tab 20. This arrangement can increase the contact area between the second welding portion 202 and the second metal foil 402, ensure the stability of the connection between the second tab 20 and the second metal foil 402, and prevent deformation of the battery electrode due to welding. This ensures the flatness of the battery electrode and improves the safety and performance of the battery. Illustratively, the area of ​​the second welding portion 202 may account for 55%, 56%, 58%, 60%, 62%, 65%, 66%, 68%, 70%, 72%, 75%, 76%, 78%, 80%, 82%, 85%, 86%, 88%, 90%, 92%, 95%, etc. The present embodiment does not limit this, and designers can adjust the area of ​​the second welding portion 202 to account for the total area of ​​the second tab 20 according to actual needs.

[0058] It should be noted that in this embodiment, the area of ​​the first welding portion 102 accounts for the same proportion of the total area of ​​the first tab 10 as the area of ​​the second welding portion 202 accounts for the total area of ​​the second tab 20, to facilitate assembly. Of course, in other embodiments, the area of ​​the first welding portion 102 accounts for the same proportion of the total area of ​​the first tab 10 as the area of ​​the second welding portion 202 accounts for the total area of ​​the second tab 20, to reduce processing accuracy and improve processing efficiency.

[0059] Continue as Figure 1-Figure 2 As shown, the specific steps for processing the battery electrode are: first, cutting a current collector of a preset size on the electrode material strip according to the processing requirements; dividing the current collector into a coating area and a blank foil area, wherein the coating area is used to coat the active material to form a electrode body 30 of the battery electrode of the corresponding polarity, and then cutting the blank foil area to form a first electrode tab 10 and a second electrode tab 20 of a preset size; the first electrode tab 10 is used to connect the first metal foil 401, and the second electrode tab 20 is used to connect the second metal foil 402, thereby realizing the electrical connection of the battery electrode to the external electrical device.

[0060] It needs to be explained that, Figure 1 As shown, a gap should exist between the first tab 10 located on the first side 301 near the second side 302 and the second tab 20 located on the second side 302 near the first side 301 to facilitate side sealing, thereby improving the packaging strength of the battery electrode sheet. During processing, the first metal foil 401 and the second metal foil 402 can be first connected to the battery electrode sheet, then packaged, and then the conductive connector 403 can be connected. This method facilitates a flat packaging structure and prevents battery leakage.

[0061] It should be noted that the battery electrode provided in this embodiment can be used as either a positive electrode or a negative electrode. When the battery electrode is used as a positive electrode, the coating area provided thereon is coated with a positive electrode active material; when the battery electrode is used as a negative electrode, the coating area provided thereon is coated with a negative electrode active material. Optionally, the positive electrode active material may include, but is not limited to, materials such as lithium cobalt oxide, lithium iron phosphate, and manganese-rich lithium; the negative electrode active material may include, but is not limited to, materials such as graphite, hard carbon, silicon, and silicon dioxide.

[0062] Example 2

[0063] This embodiment provides a battery electrode sheet, the specific structure of which is substantially the same as that of the battery electrode sheet in the first embodiment, except that the number of the first electrode tabs 10 and the number of the second electrode tabs 20 are different.

[0064] Figure 3 FIG. 1 shows a schematic diagram of the structure of the battery electrode provided in this embodiment. Figure 3As shown, in this embodiment, the first tab 10 is a strip-shaped structure, and the length of the first tab 10 is equal to the length of the first side 301; the second tab 20 is a strip-shaped structure, and the length of the second tab 20 is equal to the length of the second side 302. In other words, there is one first tab 10 and one second tab 20. This arrangement can further increase the tab area while maintaining the same tab height, thereby improving the battery's current conduction speed and enhancing the battery's rate performance.

[0065] Figure 4 FIG. 4 shows a schematic structural diagram of the battery electrode and the conductive component 40 provided in this embodiment. Figure 4 and combined Figure 3 As shown, in this embodiment, the first electrode tab 10 and the second electrode tab 20 are electrically connected via the conductive component 40 to achieve current conduction and ensure the stability of current flow.

[0066] The specific processing steps for the battery electrode provided in this embodiment are as follows: first, a current collector of a preset size is cut from the electrode material strip according to the processing requirements; the current collector is divided into a coating area and a blank foil area, wherein the coating area is used to apply the active material to form the electrode body 30 of the battery electrode of the corresponding polarity, and the blank foil area is not cut and directly serves as the first electrode tab 10 and the second electrode tab 20; the first electrode tab 10 is used to connect to the first metal foil 401, and the second electrode tab 20 is used to connect to the second metal foil 402, thereby achieving electrical connection between the battery electrode and an external electrical device. The battery electrode provided in this embodiment omits the step of cutting the blank foil area to form the electrode tabs, thereby simplifying the processing process and improving the processing efficiency of the battery electrode.

[0067] Example 3

[0068] This embodiment provides a battery electrode sheet, the specific structure of which is substantially the same as that of the battery electrode sheet in the first embodiment, except that the number of the first electrode tabs 10 and the number of the second electrode tabs 20 are different.

[0069] Figure 4 FIG. 1 shows a schematic diagram of the structure of the battery electrode provided in this embodiment. Figure 4 As shown, in one embodiment, the first electrode tab 10 is a strip-shaped structure, and the length of the first electrode tab 10 is equal to the length of the first side 301. The number of the second electrode tabs 20 is at least two, and the at least two second electrode tabs 20 are spaced apart along the length direction of the second side 302. In other words, the first electrode tab 10 adopts the structure of the first electrode tab 10 in the second embodiment, and the second electrode tab 20 adopts the structure of the second electrode tab 20 in the first embodiment.

[0070] In another embodiment, the second electrode tab 20 is a strip-shaped structure, and the length of the second electrode tab 20 is equal to the length of the second side 302. The number of first electrode tabs 10 is at least two, and the at least two first electrode tabs 10 are spaced apart along the length direction of the first side 301. In other words, the first electrode tab 10 adopts the structure of the first electrode tab 10 in the first embodiment, and the second electrode tab 20 adopts the structure of the second electrode tab 20 in the second embodiment.

[0071] Example 4

[0072] Figure 6 A schematic structural diagram of the battery provided in this embodiment is shown at one viewing angle. Figure 7 FIG. 1 shows a schematic structural diagram of the battery provided in this embodiment from another perspective. Figure 6-Figure 7 As shown, this embodiment provides a battery, which includes a positive electrode sheet 100, a negative electrode sheet 200, and a separator 300. Multiple positive electrode sheets 100 and multiple negative electrode sheets 200 are alternately stacked in sequence, and a separator 300 is provided between each adjacent positive electrode sheet 100 and negative electrode sheet 200 to prevent the positive electrode sheet 100 and the negative electrode sheet 200 from directly contacting each other and causing a short circuit, thereby ensuring the safety of the battery during use. Among them, at least one of the positive electrode sheet 100 and the negative electrode sheet 200 adopts the battery electrode sheet as described in Example 1, Example 2, or Example 3.

[0073] Optionally, in this embodiment, the first edge 301 of the positive electrode sheet 100 is arranged opposite to the first edge 301 of the negative electrode sheet 200, and the second edge 302 of the positive electrode sheet 100 is arranged opposite to the second edge 302 of the negative electrode sheet 200, so as to avoid the contact between the tab (first tab 10 or second tab 20) of the positive electrode sheet 100 and the tab (first tab 10 or second tab 20) of the negative electrode sheet 200, resulting in a short circuit, thereby further ensuring the safety of the battery during use.

[0074] To ensure the stability of current flow, in this embodiment, the tab area of ​​the positive electrode plate 100 is equal to the tab area of ​​the negative electrode plate 200 to ensure that both have the same conduction area, further improving the safety of battery use. It should be explained that the tab area of ​​the battery plate (positive electrode plate 100 or negative electrode plate 200) is the sum of the total area of ​​the first tab 10 and the total area of ​​the second tab 20. The total area of ​​the first tab 10 = the length of the first tab 10 * the width of the first tab 10 * the number of first tabs 10; the total area of ​​the second tab 20 = the length of the second tab 20 * the width of the second tab 20 * the number of second tabs 20.

[0075] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pole piece, characterized in that: include: The pole piece body (30) comprises a first side (301) and a second side (302) that are adjacently arranged and connected; A first electrode tab (10), the first electrode tab (10) being connected to the first edge (301); A second pole tab (20), wherein the second pole tab (20) is connected to the second side (302), and the first pole tab (10) and the second pole tab (20) have the same polarity.

2. The battery electrode according to claim 1, characterized in that: The number of the first pole tabs (10) is at least two, and at least two of the first pole tabs (10) are spaced apart along the length direction of the first side (301); and / or The number of the second pole tabs (20) is at least two, and at least two of the second pole tabs (20) are spaced apart along the length direction of the second side (302).

3. The battery electrode according to claim 2, characterized in that: The spacing between two adjacent first tabs (10) is equal or unequal; and / or The distances between two adjacent second pole tabs (20) are equal or unequal.

4. The battery electrode according to claim 1, characterized in that: The first electrode tab (10) is a strip-shaped structure, and the length of the first electrode tab (10) is equal to the length of the first side (301); and / or The second electrode tab (20) is a strip-shaped structure, and the length of the second electrode tab (20) is equal to the length of the second side (302).

5. The battery electrode according to any one of claims 1 to 4, characterized in that: The first electrode tab (10) and the second electrode tab (20) are electrically connected via a conductive component (40).

6. The battery electrode according to claim 5, characterized in that: The conductive component (40) comprises a first metal foil (401), a second metal foil (402) and a conductive connector (403), wherein the first metal foil (401) is electrically connected to the first pole tab (10), the second metal foil (402) is electrically connected to the second pole tab (20), one end of the conductive connector (403) is electrically connected to the first metal foil (401), and the other end of the conductive connector (403) is electrically connected to the second metal foil (402); or The conductive component (40) comprises an L-shaped metal foil, one end of the metal foil is electrically connected to the first electrode tab (10), and the other end of the metal foil is electrically connected to the second electrode tab (20).

7. The battery electrode according to claim 6, characterized in that: The first electrode tab (10) comprises a first connecting portion (101) and a first welding portion (102) connected to each other, an end of the first connecting portion (101) facing away from the first welding portion (102) is connected to the first edge (301), and the first welding portion (102) is used for electrically connecting to the first metal foil (401); The second electrode tab (20) comprises a second connecting portion (201) and a second welding portion (202) connected to each other, wherein an end of the second connecting portion (201) facing away from the second welding portion (202) is connected to the second edge (302), and the second welding portion (202) is used to electrically connect the second metal foil (402).

8. The battery electrode according to claim 7, characterized in that: The area of ​​the first welding portion (102) accounts for 50% to 98% of the total area of ​​the first electrode tab (10); and / or The area of ​​the second welding portion (202) accounts for 50% to 98% of the total area of ​​the second electrode tab (20).

9. The battery electrode according to any one of claims 1 to 4, characterized in that: The height of the first pole tab (10) is 2 mm to 20 mm; and / or the height of the second pole tab (20) is 2 mm to 20 mm.

10. A battery, characterized in that: The invention comprises a positive electrode sheet (100), a negative electrode sheet (200) and a separator (300), wherein a plurality of the positive electrode sheets (100) and a plurality of the negative electrode sheets (200) are alternately stacked in sequence, and a separator (300) is provided between each adjacent positive electrode sheet (100) and negative electrode sheet (200), and at least one of the positive electrode sheet (100) and the negative electrode sheet (200) adopts the battery sheet according to any one of claims 1 to 9; a first side (301) of the positive electrode sheet (100) is arranged opposite to a first side (301) of the negative electrode sheet (200), and a second side (302) of the positive electrode sheet (100) is arranged opposite to a second side (302) of the negative electrode sheet (200).

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