A battery adapter plate, a battery and an electric device

Abstract

This utility model provides a battery adapter, a battery, and an electrical device, relating to the field of battery technology. The battery adapter includes a terminal post connection portion, a first tab welding portion, and a second tab welding portion. Both the first and second tab welding portions are connected to the terminal post welding portion, and are centrally symmetrical about the center line of the terminal post welding portion. This design allows the welding position between the tab and the adapter to be moved from above the current winding core to above the adjacent winding core, thereby avoiding pressure on the root of the tab and reducing the incidence of tab inversion.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery adapter, a battery, and an electrical device. Background Technology

[0002] With the continuous development of the new energy vehicle and energy storage markets, traditional liquid lithium battery technology has become relatively mature. However, the number of problematic cells on the market is not small. Statistics show that voltage difference (i.e., the voltage difference between cells) is the main type of defect. Causes of voltage difference defects include defective raw materials (metallic foreign objects) and abnormal process control (such as tab tearing, electrode sheet tearing, lithium plating, electrode sheet burrs, impact damage, tab inversion, etc.). Among these, tab inversion is a relatively common but not completely resolved defect, and it is prone to batch defects. Tab inversion refers to a poorly bent tab that bends downwards and inserts into the electrode sheet layers, causing a short circuit between the tab and the other electrode sheet. Inverted tabs are usually located in the middle layer of a tab group. This is because after the tabs and adapter pieces are ultrasonically welded, the length redundancy of each tab in the tab group is different. When the core is rolled up, the tabs are constrained by the space of the lower plastic wings and adapter pieces, resulting in uncontrollable bending. The poorly bent tabs, under the pressure of both, insert downwards into the electrode sheet layers.

[0003] However, the current measures to improve tab insertion either increase material costs or add extra processes, and none of them can completely eliminate tab insertion. Utility Model Content

[0004] This invention provides a battery adapter, a battery, and an electrical device that can reduce the incidence of reverse insertion of the tabs without increasing material costs or manufacturing processes.

[0005] The embodiments of this utility model can be implemented as follows: An embodiment of this utility model provides a battery adapter, which includes: Pole post welding section; The first electrode tab welding portion and the second electrode tab welding portion are both connected to the electrode post welding portion, and the first electrode tab welding portion and the second electrode tab welding portion are centrally symmetrical about the center point of the electrode post welding portion.

[0006] In an optional embodiment, the battery adapter further includes a first connecting portion and a second connecting portion, wherein the first tab welding portion is connected to the terminal welding portion through the first connecting portion, and the second tab welding portion is connected to the terminal welding portion through the second connecting portion; the first connecting portion and the first tab welding portion are connected at an angle, and the second connecting portion and the second tab welding portion are connected at an angle.

[0007] In an optional embodiment, the first connecting portion is connected to the first electrode tab welding portion at an obtuse angle, and the second connecting portion is connected to the second electrode tab welding portion at an obtuse angle.

[0008] In an optional embodiment, a corner is provided at the connection position between the pole welding part and the first connecting part and the second connecting part.

[0009] An embodiment of this utility model also provides a battery, including a housing, a first winding core, a second winding core, a battery adapter piece, and terminals. The terminals are disposed on the housing. The first winding core and the second winding core are disposed side by side within the housing. The first winding core is provided with a first tab, and the second winding core is provided with a second tab. The first tab extends from the side of the first winding core away from the second winding core to the side closer to the second winding core, and the second tab extends from the side of the second winding core away from the first winding core to the side closer to the first winding core. The first tab and the second tab are spaced apart along the length direction of the housing and are connected to the terminals through the battery adapter piece.

[0010] In an optional embodiment, the battery adapter extends along the length of the housing and is centrally symmetrical about the center point of the battery adapter; both ends of the battery adapter are connected to the first tab and the second tab, respectively, and the center of the battery adapter is connected to the terminal post.

[0011] In an optional embodiment, the first tab includes a first conductive portion and a first extension portion connected together. The first conductive portion is connected to the first winding core. The first extension portion is parallel to and spaced apart from the top surface of the first winding core. The first extension portion extends above the second winding core. The first extension portion is connected to the first tab welding portion of the battery adapter piece. The second tab includes a second conductive portion and a second extension portion connected together. The second conductive portion is connected to the second winding core. The second extension portion is parallel to and spaced apart from the top surface of the second winding core, and extends above the first winding core. The second extension portion is connected to the second tab welding portion of the battery adapter piece.

[0012] An embodiment of this utility model also provides a battery, including a housing, a first winding core, a second winding core, terminals, and a battery adapter piece as described in any of the above embodiments. The terminals are disposed on the housing. The first winding core and the second winding core are disposed side by side within the housing. The first winding core is provided with a first tab, and the second winding core is provided with a second tab. The first tab extends from the side of the first winding core away from the second winding core to the side closer to the second winding core, and the second tab extends from the side of the second winding core away from the first winding core to the side closer to the first winding core. The first tab and the second tab are spaced apart along the length direction of the housing, such that the welding portion of the first tab is welded to the first tab, and the welding portion of the second tab is welded to the second tab.

[0013] In an optional embodiment, the housing includes a lower housing, a top cover, and a plastic component. The first core and the second core are both housed in the lower housing, the top cover closes the lower housing, and the plastic component is disposed on the surface of the top cover facing the first core and the second core. The electrode post is disposed on the top cover, and the plastic component has a through hole. The electrode post is connected to the battery adapter piece through the through hole.

[0014] An embodiment of this utility model also provides an electrical device, including the battery described in any of the above embodiments.

[0015] The beneficial effects of the battery adapter, battery, battery module, and electrical equipment according to the embodiments of this utility model include, for example: The battery adapter includes a terminal post connection portion, a first tab welding portion, and a second tab welding portion. Both the first and second tab welding portions are connected to the terminal post welding portion, and are centrally symmetrical about the center line of the terminal post welding portion. This design allows the welding position between the tab and the adapter to be moved from above the current winding core to above the adjacent winding core, thus avoiding pressure on the base of the tab and reducing the incidence of tab inversion. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the battery explosion provided in an embodiment of the present invention; Figure 2This is a schematic diagram of a battery with the top cover removed, provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the battery adapter provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the plastic part provided in the embodiments of this utility model.

[0018] Icons: 1000 - Battery; 100 - Battery adapter; 110 - Terminal welding part; 111 - Corner; 120 - First tab welding part; 130 - Second tab welding part; 140 - First connecting part; 150 - Second connecting part; 200 - Housing; 210 - Lower housing; 220 - Top cover; 221 - Terminal; 230 - Plastic part; 231 - Through hole; 300 - First winding core; 310 - First tab; 311 - First conductive part; 312 - First extension part; 400 - Second winding core; 410 - Second tab; 411 - Second conductive part; 412 - Second extension part. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] With the continuous development of the new energy vehicle and energy storage markets, traditional liquid lithium battery technology has become relatively mature. However, the number of problematic cells on the market is not small. Statistics show that voltage difference (i.e., the voltage difference between cells) is the main type of defect. Causes of voltage difference defects include defective raw materials (metallic foreign objects) and abnormal process control (such as tab tearing, electrode sheet tearing, lithium plating, electrode sheet burrs, impact damage, tab inversion, etc.). Among these, tab inversion is a relatively common but not completely resolved defect, and it is prone to batch defects. Tab inversion refers to a poorly bent tab that bends downwards and inserts into the electrode sheet layers, causing a short circuit between the tab and the other electrode sheet. Inverted tabs are usually located in the middle layer of a tab group. This is because after the tabs and adapter pieces are ultrasonically welded, the length redundancy of each tab in the tab group is different. When the core is rolled up, the tabs are constrained by the space of the lower plastic wings and adapter pieces, resulting in uncontrollable bending. The poorly bent tabs, under the pressure of both, insert downwards into the electrode sheet layers.

[0026] Currently, the industry's common solutions to address the issue of inverted tabs are: adding a hot melt adhesive layer at the base of the tabs, which, through heating, causes the base of the tabs to adhere together. However, this method requires additional manufacturing processes, increasing material and production costs, and in practical applications, the adhesion between the tabs is not satisfactory, with inverted insertion still occurring in cells using this method; or adding a protective film at the base of the tab group. This method cannot guarantee that the tabs in the middle of the tab group will not be inverted, and it also increases additional manufacturing processes, increasing material and production costs, while it is not actually used in the market; or adding an inward folding section under the plastic of the top cover to expand the tab group on both sides in the direction of the core thickness. This is a commonly used measure, but its effectiveness is also poor, because it is precisely this additional folding section that causes the tabs to be subjected to more compression.

[0027] Currently available measures to improve tab insertion either increase material costs or add extra steps, and none of them can completely eliminate tab insertion.

[0028] Based on this, please refer to Figure 1 and Figure 2The battery 1000 provided in the embodiments of this utility model can effectively improve the aforementioned technical problems. The battery adapter 100 can reduce the incidence of reverse insertion of the tabs without increasing material costs or manufacturing processes. The battery adapter 100 is applied to the battery 1000, and the battery 1000 is applied to electrical equipment. Both the battery 1000 and the equipment having the battery adapter 100 have the same functions as described above, which will not be elaborated further here.

[0029] The electrical device in this embodiment includes a power-consuming device and a battery 1000 with the battery adapter 100. The battery 1000 provides power to the power-consuming device to enable its various functions. The power-consuming device can be an electric vehicle, with the battery 1000 installed inside the vehicle body, providing power to the vehicle body to enable its various functions. The power-consuming device can also be a power bank, smart home device, or other electrical devices, which are not limited here.

[0030] Figure 1 This is an exploded schematic diagram of the battery 1000 provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of a battery 1000 with the top cover 220 removed, as provided in an embodiment of this utility model. Please refer to [link / reference]. Figure 1 and Figure 2 The battery 1000 provided in this embodiment includes a housing 200, a first winding core 300, a second winding core 400, a battery adapter piece 100, and a terminal post 221. The terminal post 221 is provided on the housing 200. The first winding core 300 and the second winding core 400 are arranged side by side in the housing 200. The first winding core 300 is provided with a first tab 310, and the second winding core 400 is provided with a second tab 410. The first tab 310 extends from the side of the first winding core 300 away from the second winding core 400 to the side closer to the second winding core 400, and the second tab 410 extends from the side of the second winding core 400 away from the first winding core 300 to the side closer to the first winding core 300. The first tab 310 and the second tab 410 are spaced apart along the length direction of the housing 200 and are connected to the terminal post 221 through the battery adapter piece 100. The first tab 310 and the second tab 410 extend in opposite directions and are staggered along the length of the housing 200. This avoids the tabs from stacking and being squeezed, reducing the risk of inverted insertion caused by bending and deformation of the first tab 310 and the second tab 410. Furthermore, this design allows the welding points of the first tab 310, the second tab 410, and the battery adapter piece 100 to be located above adjacent cores, rather than above the current core, further reducing the possibility of deformation at the base of the first tab 310 and the base of the second tab 410 due to pressure. The battery adapter piece 100 here can be a centrally symmetrical battery adapter piece 100 as described below, or a battery adapter piece 100 of other shapes and structures; no limitation is made here.

[0031] Please continue reading. Figure 1 and Figure 2 In this embodiment, the battery adapter piece 100 extends along the length of the housing 200 and is centrally symmetrically arranged with respect to its center point. Both ends of the battery adapter piece 100 are connected to the first tab 310 and the second tab 410, respectively, and the center of the battery adapter piece 100 is connected to the terminal post 221. The extending directions of the first tab 310 and the second tab 410 match the centrally symmetrical design of the battery adapter piece 100, facilitating automated welding positioning, improving production efficiency, simplifying the assembly process, and reducing costs. Furthermore, this design allows the welding positions of the first tab 310, the second tab 410, and the battery adapter piece 100 to be moved from the top of this core to the top of the adjacent core. This eliminates the pressure from the battery adapter piece 100 on the roots of the first tab 310 and the second tab 410. Consequently, after the first tab 310, the second tab 410, and the battery adapter piece 100 are welded together, and during the core winding process, the pressure from the battery adapter piece 100 on the roots of the first tab 310 and the second tab 410 is avoided, reducing the incidence of tab inversion.

[0032] In this embodiment, the first tab 310 includes a first conductive portion 311 and a first extension portion 312 connected together. The first conductive portion 311 is connected to the first winding core 300. The first extension portion 312 is parallel to and spaced apart from the top surface of the first winding core 300, and extends above the second winding core 400. The first extension portion 312 is connected to the first tab welding portion 120 of the battery adapter piece 100. The second tab 410 includes a second conductive portion 411 and a second extension portion 412 connected together. The second conductive portion 411 is connected to the second winding core 400. The second extension portion 412 is parallel to and spaced apart from the top surface of the second winding core 400, and extends above the first winding core 300. The second extension portion 412 is connected to the second tab welding portion 130 of the battery adapter piece 100. The first extension 312 or the second extension 412 is spaced apart from the top surface of the first core 300 or the second core 400, providing a certain space for thermal expansion. The first tab 310 is connected to the first core 300 through the first conductive part 311. Its first extension 312 is spaced apart from the top surface of the first core 300 and the second core 400, providing a buffer space. This ensures that the welding point of the first tab 310 and the battery adapter piece 100 does not contact the first core 300 or the second core 400 while maintaining connection strength. This prevents the first tab 310 from being squeezed and bent into the first core 300 or the second core 400 during the winding process, thereby reducing the occurrence of tab inversion. The second tab 410 is connected to the second winding core 400 through the second conductive part 411. Its second extension 412 is spaced apart from the top surfaces of the first winding core 300 and the second winding core 400, providing a buffer space. This ensures that the welding point between the second tab 410 and the battery adapter piece 100 does not contact the first winding core 300 or the second winding core 400 while maintaining connection strength. This prevents the first tab 310 from being squeezed and bent into the first winding core 300 or the second winding core 400 during the winding process, thereby reducing the occurrence of tab inversion.

[0033] Of course, the first tab 310 and the second tab 410 can also be designed in other shapes and structures, which are not limited here. Moreover, in this embodiment, there are multiple first tabs 310 and multiple second tabs 410. Multiple first tabs 310 are spaced apart along the width direction of the first core 300, and multiple second tabs 410 are spaced apart along the width direction of the second core 400, so as to avoid the risk of short circuit due to overlap of the first tabs 310 and the second tabs 410.

[0034] In addition, this embodiment also provides a battery 1000 including a housing 200, a first winding core 300, a second winding core 400, a terminal post 221, and a centrally symmetrically designed battery adapter piece 100. The terminal post 221 is provided on the housing 200; the first winding core 300 and the second winding core 400 are arranged side by side in the housing 200; the first winding core 300 is provided with a first tab 310, and the second winding core 400 is provided with a second tab 410. The first tab 310 extends from the side of the first winding core 300 away from the second winding core 400 to the side closer to the second winding core 400, and the second tab 410 extends from the side of the second winding core 400 away from the first winding core 300 to the side closer to the first winding core 300; the first tab 310 and the second tab 410 are spaced apart along the length direction of the housing 200, so that the first tab welding portion 120 is welded to the first tab 310, and the second tab welding portion 130 is welded to the second tab 410. The first tab 310 and the second tab 410 extend in opposite directions and are staggered along the length of the housing 200. This avoids the tabs from stacking and being squeezed, reducing the risk of inverted insertion caused by bending and deformation of the first tab 310 and the second tab 410. Furthermore, this design allows the welding positions of the first tab 310, the second tab 410, and the battery adapter piece 100 to be located above the adjacent core, rather than above the current core. This eliminates the pressure from the battery adapter piece 100 above the roots of the first tab 310 and the second tab 410. After welding the first tab 310 and the second tab 410 to the battery adapter piece 100, and during the core winding process, the pressure of the battery adapter piece 100 on the roots of the tabs is avoided, further reducing the possibility of deformation of the roots of the first tab 310 and the second tab 410 under pressure, thereby reducing the incidence of inverted insertion. The extension directions of the first tab 310 and the second tab 410 are matched with the central symmetrical design of the battery adapter piece 100, which facilitates automated welding positioning, improves production efficiency, simplifies the assembly process, and reduces costs.

[0035] Specifically, please refer to Figure 1 and Figure 2 and combined Figure 4 , Figure 4 This is a schematic diagram of the plastic part 230 provided in an embodiment of the present invention. The housing 200 in this embodiment includes a lower housing 210, a top cover 220, and the plastic part 230. The first core 300 and the second core 400 are both housed within the lower housing 210. The top cover 220 closes the lower housing 210. The plastic part 230 is disposed on the surface of the top cover 220 facing the first core 300 and the second core 400. A terminal post 221 is disposed on the top cover 220. The plastic part 230 has a through hole 231, through which the terminal post 221 is connected to the battery adapter piece 100. Of course, the housing 200 can also be designed in other structural forms, which are not limited here.

[0036] To prevent the plastic part 230 from potentially squeezing the first tab 310 and the second tab 410, the plastic part 230 in this embodiment has a plate-like structure, eliminating the wing design of the plastic part in the prior art. The base of the tab is not squeezed or restricted by the battery adapter piece 100 and the wings of the plastic part 230 above the core, thus preventing the tab from being inserted in reverse and greatly reducing the occurrence rate of tab inversion.

[0037] The structure of the battery adapter piece 100 is described in detail below.

[0038] In existing technologies, the adapter piece is usually designed as a "Y" shape. After the electrode tab is welded to the adapter piece, the adapter piece is located above the electrode tab. When the core is closed, the electrode tab is restricted by the space of the adapter piece, resulting in an uncontrollable bending state. As a result, the electrode tab may be inserted downward into the electrode layer under the pressure of the adapter piece, resulting in the electrode tab being inserted backward.

[0039] Figure 3 This is a schematic diagram of the battery adapter 100 provided in an embodiment of this utility model. Please refer to... Figure 3 In this embodiment, the battery adapter 100 includes a terminal post welding portion 110, a first tab welding portion 120, and a second tab welding portion 130. Both the first tab welding portion 120 and the second tab welding portion 130 are connected to the terminal post welding portion 110, and are centrally symmetrically arranged about the center point of the terminal post welding portion 110. With this design, the tab group of each core is welded to a welding area of ​​the battery adapter 100 located relatively far from the core. The battery adapter 100 allows the welding position of the tabs to be moved from above the current core to above the adjacent core. This eliminates the pressure from the battery adapter 100 on the roots of the first tab 310 and the second tab 410. Consequently, after welding the first tab 310 and the second tab 410 to the battery adapter 100, and during the core winding process, the pressure from the battery adapter 100 on the roots of the first tab 310 and the second tab 410 can be minimized, thus reducing the incidence of tab inversion.

[0040] Please continue reading. Figure 3In this embodiment, the battery adapter 100 further includes a first connecting portion 140 and a second connecting portion 150. The first tab welding portion 120 is connected to the terminal post welding portion 110 through the first connecting portion 140, and the second tab welding portion 130 is connected to the terminal post welding portion 110 through the second connecting portion 150. The first connecting portion 140 and the first tab welding portion 120 are connected at an angle, and the second connecting portion 150 and the second tab welding portion 130 are connected at an angle. The angled connection between the first connecting portion 140 and the first tab welding portion 120, and the second connecting portion 150 and the second tab welding portion 130, can disperse stress, avoid the stress concentration problem caused by traditional straight connection, and reduce the risk of weld point breakage. The angled design can also provide a larger buffer space for the root of the tab group, reduce the rigid compression of the tab group by the battery adapter 100 when the core is closed, thereby reducing the occurrence of tab inversion. Furthermore, the angled design allows for adjustment of the spatial position of the tab welding portions, ensuring that the tab groups of the first core 300 and the second core 400 are staggered in the width direction. In addition, this design offers greater compatibility; even with minor dimensional deviations in the core or tab groups, the angled connection design can absorb some of the dimensional errors, reducing the requirements for processing precision. To avoid obstructing the tabs, in this embodiment, the first connecting portion 140 is connected to the first tab welding portion 120 at an obtuse angle, and the second connecting portion 150 is connected to the second tab welding portion 130 at an obtuse angle. Of course, the first connecting portion 140 can also be connected to the first tab welding portion 120 at a right angle, an acute angle, or a flat angle, and the second connecting portion 150 can be connected to the second tab welding portion 130 at a right angle, an acute angle, or a flat angle, depending on the arrangement of the tab groups and the spatial position of the battery 1000; this is not limited here.

[0041] To relocate the welding position of one core tab and adapter plate to above another adjacent cell, increasing the space above the base of the tab and preventing compression that could cause the tab to be inserted incorrectly, a corner 111 is provided at the connection points between the electrode welding portion 110 and the first connecting portion 140 and the second connecting portion 150 in this embodiment. Of course, the first connecting portion 140 and the second connecting portion 150 can also be connected in a straight line without the corner 111.

[0042] In this embodiment, the first tab welding part 120, the first connecting part 140, the second connecting part 150, and the second tab welding part 130 are integrally formed.

[0043] In summary, the battery adapter 100 includes a terminal welding portion 110, a first tab welding portion 120, and a second tab welding portion 130. Both the first tab welding portion 120 and the second tab welding portion 130 are connected to the terminal welding portion 110, and are centrally symmetrical about the center line of the terminal welding portion 110. This design allows the welding positions of the first tab 310 and the second tab 410 to the battery adapter 100 to be moved from above the current winding core to above the adjacent winding core, thereby minimizing the squeezing of the tab root by the battery adapter 100 and reducing the incidence of tab inversion. Furthermore, it helps optimize current distribution, reduces excessive local current density, lowers the risk of polarization and overheating in the battery 1000, and improves the energy efficiency and cycle life of the battery 1000.

[0044] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A battery adapter, characterized in that, include: Pole post welding part (110); The first electrode tab welding part (120) and the second electrode tab welding part (130) are both connected to the pole post welding part (110), and the first electrode tab welding part (120) and the second electrode tab welding part (130) are centrally symmetrical about the center point of the pole post welding part (110).

2. The battery adapter according to claim 1, characterized in that, The battery adapter (100) further includes a first connecting part (140) and a second connecting part (150). The first tab welding part (120) is connected to the pole welding part (110) through the first connecting part (140), and the second tab welding part (130) is connected to the pole welding part (110) through the second connecting part (150). The first connecting part (140) and the first tab welding part (120) are connected at an angle, and the second connecting part (150) and the second tab welding part (130) are connected at an angle.

3. The battery adapter according to claim 2, characterized in that, The first connecting part (140) is connected to the first electrode tab welding part (120) at an obtuse angle, and the second connecting part (150) is connected to the second electrode tab welding part (130) at an obtuse angle.

4. The battery adapter according to claim 2, characterized in that, The pole welding part (110) is provided with a corner (111) at the connection position with the first connecting part (140) and the second connecting part (150).

5. A battery, characterized in that, The device includes a housing (200), a first winding core (300), a second winding core (400), a battery adapter plate (100), and terminals (221). The terminals (221) are disposed on the housing (200). The first winding core (300) and the second winding core (400) are disposed side by side within the housing (200). The first winding core (300) is provided with a first tab (310), and the second winding core (400) is provided with a second tab (410). The first tab (310) is formed by the... The first core (300) extends from the side away from the second core (400) to the direction close to the second core (400), and the second tab (410) extends from the side of the second core (400) away from the first core (300) to the direction close to the first core (300); the first tab (310) and the second tab (410) are spaced apart along the length direction of the housing (200) and are connected to the terminal post (221) through the battery adapter (100).

6. The battery according to claim 5, characterized in that, The battery adapter piece (100) extends along the length of the housing (200) and is centrally symmetrical about the center point of the battery adapter piece (100); the two ends of the battery adapter piece (100) are respectively connected to the first tab (310) and the second tab (410), and the center of the battery adapter piece (100) is connected to the terminal post (221).

7. The battery according to claim 5 or 6, characterized in that, The first tab (310) includes a first conductive part (311) and a first extension part (312) connected to each other. The first conductive part (311) is connected to the first winding core (300). The first extension part (312) is parallel to and spaced apart from the top surface of the first winding core (300). The first extension part (312) extends to the top of the second winding core (400). The first extension part (312) is connected to the first tab welding part (120) of the battery adapter piece (100). The second tab (410) includes a second conductive part (411) and a second extension part (412) connected to each other. The second conductive part (411) is connected to the second core (400). The second extension part (412) is parallel to and spaced apart from the top surface of the second core (400). The second extension part (412) extends above the first core (300). The second extension part (412) is connected to the second tab welding part (130) of the battery adapter piece (100).

8. A battery, characterized in that, The device includes a housing (200), a first core (300), a second core (400), a terminal post (221), and a battery adapter piece (100) as described in any one of claims 1-4. The terminal post (221) is disposed on the housing (200). The first core (300) and the second core (400) are disposed side by side within the housing (200). The first core (300) is provided with a first tab (310), and the second core (400) is provided with a second tab (410). The first tab (310) extends from the first core (300) to the... The second electrode tab (410) extends from the side of the second core (400) away from the first core (300) to the direction close to the second core (400); the first electrode tab (310) and the second electrode tab (410) are spaced apart along the length direction of the housing (200) such that the first electrode tab welding portion (120) is welded to the first electrode tab (310) and the second electrode tab welding portion (130) is welded to the second electrode tab (410).

9. The battery according to claim 5 or 8, characterized in that, The housing (200) includes a lower housing (210), a top cover (220), and a plastic part (230). The first core (300) and the second core (400) are both housed in the lower housing (210). The top cover (220) closes the lower housing (210). The plastic part (230) is disposed on the surface of the top cover (220) facing the first core (300) and the second core (400). The terminal post (221) is disposed on the top cover (220). The plastic part (230) has a through hole (231). The terminal post (221) is connected to the battery adapter piece (100) through the through hole (231).

10. An electrical appliance, characterized in that, Includes the battery (1000) as described in any one of claims 5-9.

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