Battery monomer, battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery monomer, a battery and an electric device. Each single battery comprises a cover plate, a switching piece and two battery cells, and the cover plate comprises an inner surface facing the battery cells and an outer surface back to the battery cells; the two battery cells are oppositely arranged, and each battery cell extends outwards from the inner side of the end surface to form a tab; a groove is formed in the inner surface of the cover plate, at least part of the switching piece is located in the groove, the switching piece comprises a main body part and two bent parts, each bent part is bent to the side, facing the battery cells, of the main body part, and the tab of one battery cell is connected with one bent part. The battery monomer, the battery and the electric device provided by the utility model have higher capacity and energy density.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] A battery cell typically includes a casing, a cover assembly, and a cell. The cover assembly is installed at the opening of the casing and cooperates with the casing to form an installation space. The cell is installed in the installation space, and the tabs of the cell are electrically connected to the cover assembly for the input or output of electrical energy.

[0003] In the prior art, the cover plate assembly includes a cover plate, terminals mounted on the cover plate, and adapter plates connected to the terminals. The tabs of the battery cell are connected to the adapter plates to connect to the terminals via the adapter plates. In the prior art, the cover plate is typically of uniform thickness, and the adapter plates and tabs are located on the side of the cover plate facing the battery cell. This means that the adapter plates and tabs need to occupy a certain amount of space in the thickness direction of the cover plate. Consequently, the installation space formed by the casing and the cover plate needs to be allocated to accommodate the adapter plates and tabs, resulting in low space utilization of the battery cell and consequently, low energy density of the battery cell and the battery as a whole. Utility Model Content

[0004] The purpose of this invention is to provide a battery cell, a battery, and an electrical device with high capacity and energy density.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery cell is provided, comprising a cover plate, an adapter plate, and two battery cells, wherein the cover plate includes an inner surface facing the battery cells and an outer surface facing away from the battery cells; characterized in that:

[0007] The two said cells are arranged opposite each other, and each said cell extends an electrode tab from the inside of its end face outward;

[0008] The inner surface of the cover plate is provided with a groove, and at least part of the adapter piece is located in the groove. The adapter piece includes a main body and two bent parts. Each bent part is bent to the side of the main body facing the battery cell. The tab of one of the battery cells is connected to one of the bent parts.

[0009] Optionally, each of the tabs includes a connecting portion and an extension portion, the connecting portion being led out from the battery cell;

[0010] The extension is located between the corresponding bend and the main body, or the extension is located on the side of the corresponding bend facing away from the main body.

[0011] Optionally, the two bent portions are connected to the edges on both sides of the main body, and the extension portion bypasses the free end of the corresponding bent portion and is fixed to the surface of the bent portion facing the main body.

[0012] Optionally, the extension is welded to the bend to form a welded portion, the welded portion passing through the bend and extending to the extension.

[0013] Optionally, the edge of the free end of the bent portion is a rounded chamfer, or the free end of the bent portion is covered with a buffer layer.

[0014] Optionally, there is a gap between the connecting portion and the free end of the corresponding bent portion.

[0015] Optionally, the surface of the electrode facing the battery cell is located in the groove.

[0016] Optionally, the adapter piece is entirely located within the groove.

[0017] Optionally, the battery cell includes a facing surface toward another battery cell and a facing surface disposed opposite to the facing surface;

[0018] The electrode includes multiple layers of electrode portions arranged side by side along the thickness direction of the battery cell and having the same polarity. All multiple electrode portions are bent toward the back side of the phase. The distance between the electrode portion closest to the back side of the phase and the phase-facing surface is W1. The thickness of the battery cell is W2, and W1 / W2 = 0 to 1 / 4.

[0019] Optionally, the outer surface of the cover plate is provided with a protrusion corresponding to the position of the groove.

[0020] Optionally, the width direction of the protrusion is the same as the width direction of the cover plate, the width of the protrusion is a, the width of the cover plate is b, and 0.2b≤a≤0.9b.

[0021] Optionally, 0.4b≤a≤0.7b, the center of the protrusion in its width direction coincides with the center of the cover plate in its width direction.

[0022] Optionally, the battery cell further includes a terminal post, which is mounted on the cover plate, and one end of the terminal post is connected to the surface of the main body facing away from the bent portion; or,

[0023] The main body is provided with a through hole, one end of the pole is connected to the wall of the through hole, and the end face of one end of the pole is flush with the surface of the main body facing the bending part and connected to the electrode tab.

[0024] Optionally, the battery cell further includes an electrode post, which is integrally formed with the adapter plate.

[0025] Optionally, the adapter piece further includes a thinned portion connecting the bent portion and the main body portion, wherein the thickness of the thinned portion is less than the thickness of the main body portion.

[0026] A battery is provided, comprising the battery cell as described above.

[0027] An electrical device is provided, comprising a battery cell as described above, or a battery as described above.

[0028] The beneficial effects of this utility model are:

[0029] The battery cell, battery, and electrical device provided by this utility model include an adapter plate comprising a main body and two bent portions. The tab of one battery cell is connected to one of the bent portions, and the tab extends outward from the inner side of the end face of the battery cell facing the cover plate, facilitating the connection between the tab and the bent portion. The inner surface of the cover plate has a groove, and at least a portion of the adapter plate is located in the groove for reception. This fully utilizes the space of the cover plate in its thickness direction, allowing for a smaller gap between the battery cell and the cover plate, improving the space utilization rate of the battery cell. Consequently, a higher battery cell size can be achieved in a battery cell of the same dimensions, thereby increasing the capacity of the battery cell and enabling the battery and electrical device using the battery cell to have higher energy density. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a single battery cell provided by this utility model;

[0031] Figure 2 This is a first cross-sectional view of the battery cell provided by this utility model;

[0032] Figure 3 This is a utility model Figure 2 The enlarged view at point A is shown below;

[0033] Figure 4 This is a first structural schematic diagram of the adapter plate provided by this utility model;

[0034] Figure 5 This is a schematic diagram of the second structure of the adapter plate provided by this utility model;

[0035] Figure 6 This is a schematic diagram of the pole provided by this utility model;

[0036] Figure 7 This is a second sectional view of the battery cell provided by this utility model;

[0037] Figure 8This is an assembly diagram of the battery cell provided by this utility model;

[0038] Figure 9 This is a top view of the battery cell provided by this utility model;

[0039] Figure 10 This is a cross-sectional view of a portion of the adapter provided by this utility model.

[0040] In the picture:

[0041] 100. Cover plate; 110. Inner surface; 111. Groove; 120. Outer surface; 130. Protrusion; 200. Terminal post; 210. First end; 220. Second end; 230. Stepped structure; 300. Adapter piece; 310. Main body; 320. Bending part; 321. Free end; 330. Through hole; 331. Large hole section; 332. Small hole section; 340. Buffer layer; 400. Battery cell; 410. Tab; 411. Connecting part; 412. Extension part; 420. Facing side; 430. Facing back side; 500. Housing;

[0042] 10. Welding auxiliary parts; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] The bending portion is provided in multiple ways, and there is a gap between two adjacent or oppositely arranged bending portions.

[0049] Firstly, this embodiment provides a battery cell with high space utilization and energy density.

[0050] Example 1

[0051] like Figures 1 to 3 As shown, the battery cell includes a cover plate 100, an adapter plate 300, and two battery cells 400. Both battery cells 400 are located on the same side of the cover plate 100. The cover plate 100 includes an inner surface 110 facing the battery cells 400 and an outer surface 120 facing away from the battery cells 400. The inner surface 110 and the outer surface 120 are disposed opposite each other in the thickness direction of the cover plate 100. In this embodiment, the length direction of the cover plate 100 is a first direction X, the width direction of the cover plate 100 is a second direction Y, and the thickness direction of the cover plate 100 is a third direction Z. That is, the height direction of the battery cells 400 and the height direction of the battery cell are both in the third direction Z.

[0052] In this embodiment, as Figure 2As shown, two battery cells 400 are arranged opposite each other. Specifically, the two battery cells 400 are arranged opposite each other in the second direction Y, and each battery cell 400 extends a tab 410 outward from the inner side of its end face facing the cover plate 100. It should be noted that the inner side of the end face of the battery cell 400 facing the cover plate 100 refers to the side of the end face of the battery cell 400 facing the cover plate 100 that is closer to the other battery cell 400. The tab 410 extends outward from the inner side of the end face of the battery cell 400 facing the cover plate 100. It should also be noted that each battery cell 400 includes two tabs 410, namely a positive tab and a negative tab.

[0053] In this embodiment, two adapter pieces 300 are provided, each adapter piece 300 being used to electrically connect tabs 410 of the same polarity. For example, one adapter piece 300 is electrically connected to the positive tabs of the two battery cells 400, and the other adapter piece 300 is electrically connected to the negative tabs of the two battery cells 400.

[0054] like Figure 3 As shown, the inner surface 110 of the cover plate 100 is provided with a groove 111. Specifically, the inner surface 110 of the cover plate 100 is provided with two grooves 111, each corresponding to one of the two adapter pieces 300. At least a portion of each adapter piece 300 is located in the corresponding groove 111 for reception, thereby reducing the space occupied by the adapter piece 300 in the cell 400 accommodating space on one side of the cover plate 100. Furthermore, as... Figure 4 As shown, the adapter 300 includes a main body 310 and two bent portions 320. Each bent portion 320 is bent to the side of the main body 310 facing the battery cell 400. A tab 410 of one battery cell 400 is connected to one of the bent portions 320 to transmit electrical energy through the adapter 300. In this embodiment, the two bent portions 320 correspond one-to-one with the tabs 410 of the two battery cells 400 of the same polarity, and each tab 410 is electrically connected to its corresponding bent portion 320. Exemplarily, the main body 310 is used to electrically connect to the terminal post 200 of the battery cell disposed on the cover plate 100, so that the electrical connection between the terminal post 200 and the tab 410 is realized through the adapter 300.

[0055] The battery cell provided in this embodiment includes an adapter 300 comprising a main body 310 and two bent portions 320. A tab 410 of a cell 400 is connected to one of the bent portions 320. The tab 410 extends outward from the inner side of the end face of the cell 400 facing the cover plate 100, facilitating the connection between the tab 410 and the bent portion 320. A groove 111 is provided on the inner surface 110 of the cover plate 100, and at least a portion of the adapter 300 is located in the groove 111 for reception. This fully utilizes the space of the cover plate 100 in its thickness direction, allowing for a smaller gap between the cell 400 and the cover plate 100, improving the space utilization of the battery cell. Consequently, the number of cells 400 in a battery cell of the same size can be increased, thereby increasing the capacity of the battery cell and enabling batteries and electrical devices using the battery cell to have higher energy density.

[0056] For example, such as Figure 3 As shown, each tab 410 includes a connecting portion 411 and an extension portion 412. The connecting portion 411 extends from the inner side of the end face of the cell 400 toward the cover plate 100. The extension portion 412 is connected to the corresponding bend portion 320.

[0057] Optionally, such as Figure 3 As shown, the extension 412 is located between the corresponding bend 320 and the main body 310, allowing the tab 410 and the adapter piece 300 to have a larger contact area, thus improving the connection stability and reliability between the tab 410 and the adapter piece 300. In this embodiment, the extension 412 is fixedly connected to at least one of the corresponding bend 320 and the main body 310. For example, the extension 412 can be sandwiched between the bend 320 and the main body 310 to reduce the probability of movement of the extension 412 relative to the adapter piece 300, thereby improving the connection's strength.

[0058] It should be noted that by setting the tab 410 to extend from the inside of the end face, and with the tab 410 extension 412 positioned between the bending portion 320 and the main body 310, the length of the bending portion 320 in the second direction Y can be larger, which further increases the connection area between the tab 410 and the corresponding adapter piece 300, thereby further improving the battery's overcurrent capability.

[0059] In some alternative embodiments, such as Figure 4 and Figure 5As shown, two bends 320 are connected to the edges on both sides of the main body 310. Specifically, the two bends 320 are connected to the edges on both sides of the main body 310 in the second direction Y, and both extend toward the center of the main body 310 in the second direction Y. The two bends 320 are spaced apart in the second direction Y so that the tab 410 passes through the gap between the two bends 320 and extends to the space between the bends 320 and the main body 310.

[0060] In this embodiment, as Figure 3 and Figure 4 As shown, the extension 412 bypasses the free end 321 of the corresponding bend 320 and is fixed to the surface of the bend 320 facing the main body 310. The free end 321 of the bend 320 is the end of the bend 320 that is positioned opposite to the end connecting to the main body 310. By bypassing the free end 321 of the corresponding bend 320, the extension 412 eliminates the need for a through hole 330 in the bend 320, and also reduces the assembly difficulty between the tab 410 and the adapter piece 300. Furthermore, by fixing the extension 412 of the tab 410 to the surface of the bend 320 facing the main body 310, the extension 412 of the tab 410 can be limited by the bend 320 and the main body 310, preventing the tab 410 from becoming loose or inserted upside down into the battery cell 400.

[0061] Optionally, such as Figure 8 As shown, the extension 412 is welded to the bend 320 to form a welded portion (not shown in the figure). The welded portion passes through the bend 320 and extends to the extension 412. That is, when welding the bend 320 and the extension 412, welding is performed from the side of the bend 320 away from the extension 412, and the welding direction is perpendicular to the arrangement direction of the bend 320 and the extension 412. The fact that the welded portion passes through the bend 320 and extends to the extension 412 improves the connection strength between the bend 320 and the extension 412, facilitates welding between the bend 320 and the extension 412, and reduces the assembly difficulty of the battery cell.

[0062] In some alternative embodiments, please continue to refer to Figure 8When the bent portion 320 is welded to the extension portion 412, it is not bent to one side of the main body portion 310, but is set perpendicular to the main body portion 310. Furthermore, the main body portion 310 is already connected to the terminal post 200 of the battery cell mounted on the cover plate 100. When connecting the terminal post 200 to the main body portion 310, the bent portion 320 is not bent to one side of the main body portion 310, allowing the terminal post 200 to be welded to the main body portion 310 side. This reduces the difficulty of connecting the adapter piece 300 to the terminal post 200. Moreover, the welding of the terminal post 200 to the adapter piece 300 and the welding of the tab 410 to the adapter piece 300 are two independent steps that do not interfere with each other. This ensures the welding effect of both the terminal post 200 and the adapter piece 300, as well as the welding effect of the tab 410 to the adapter piece 300. For example, as... Figure 8 As shown, when welding the extension 412 and the bending portion 320, a welding auxiliary member 10 can be provided between the two extensions 412 with the same polarity of the two cells 400. The extension 412 is sandwiched between the welding auxiliary member and the bending portion 320, so that the extension 412 will not move relative to the extension 412 during the welding process, which further improves the welding effect.

[0063] Please see Figure 8 When welding the bent portion 320 and the extension portion 412, the two battery cells 400 are spaced apart in the second direction Y. After welding the two bent portions 320 of an adapter piece 300 to the two tabs 410 of the same polarity of the two battery cells 400, the two battery cells 400 are controlled to move closer to each other in the second direction Y and closer to each other with the cover plate 100 in the third direction Z. That is, the bent portions 320 are controlled to rotate so that the two bent portions 320 bend towards one side of the main body portion 310 until the two battery cells 400 abut against each other in the second direction Y and the two bent portions 320 bend to one side of the main body portion 310 (i.e., Figure 2 and Figure 3 (as shown in the diagram), at this time, the angle of rotation of the bent part 320 is approximately 90 degrees.

[0064] It is understandable that the assembly method of the battery cell is not limited to the above method. For example, the extension 412 of the tab 410 and the bent portion 320 of the adapter 300 can be welded first, and then the terminal 200 and the main body 310 can be welded. Specifically, the bent portion 320 of the adapter 300 and the main body 310 are located on the same plane, and the two cells 400 are in a horizontal position. First, the tab 410 is welded to the bent portion 320. Then, the cell 400 and the bent portion 320 are rotated 90 degrees relative to the main body 310. At this time, the two cells 400 are in an upright position, and the bent portion 320 is perpendicular to the main body 310. After that, the main body 310 and the terminal 200 are welded. Finally, control the two battery cells 400 to move closer to each other in the second direction Y and closer to each other with the cover plate 100 in the third direction Z. That is, control the bending part 320 to rotate so that the two bending parts 320 bend to one side of the main body 310 until the two battery cells 400 abut against each other in the second direction Y and the two bending parts 320 bend to one side of the main body 310.

[0065] To facilitate bending of the bending portion 320 relative to the main body portion 310, in some optional embodiments, the adapter piece 300 further includes a thinned portion (not shown in the figure) connecting the bending portion 320 and the main body portion 310, the thickness of which is less than the thickness of the main body portion 310. By providing a thinned portion with a thickness less than that of the main body portion 310, the bending portion 320 can be bent to one side of the main body portion 310 through the thinned portion, reducing the bending difficulty of the bending portion 320, improving the operability of controlling the bending portion 320 through the cell 400, and increasing the success rate of battery cell assembly.

[0066] In this embodiment, when the extension 412 of the tab 410 bypasses the free end 321 of the corresponding bend 320, in order to avoid the sharp edges of the bend 320 scratching the extension 412, the edge of the free end 321 of the bend 320 is rounded, making the free end 321 smoother, so as not to damage the extension 412, especially not to damage the extension 412 of the tab 410 located in the inner layer, thus ensuring the integrity of the tab 410.

[0067] For example, a gap exists between the connecting portion 411 and the free end 321 of the corresponding bending portion 320. This gap provides room for the movement of the connecting portion 411, allowing sufficient space for dimensional changes in the connecting portion 411 during the bending process after the bending portion 320 and the extension portion 412 are welded together and bent towards the main body portion 310. This prevents the problem of pulling the tab 410 due to the small distance between the connecting portion 411 and the free end 321, thus improving the assembly success rate of the battery cell. Furthermore, since the tab 410 extends outward from the inside of the end face of the cell 400 facing the cover plate 100, it ensures that all tabs 410 can be accommodated in the groove 111 as much as possible.

[0068] For example, in order to further improve the space utilization of battery cells, such as Figure 3 As shown, the surface of the tab 410 facing the cell 400 is located in the groove 111, that is, the surface of the extension 412 facing the cell 400 is located in the groove 111. Thus, the entire extension 412 is located in the groove 111, and the main body 310 is also located in the groove 111, ensuring that neither the main body 310 nor the extension 412 of the tab 410 occupies the installation space of the cell 400, further increasing the volume of the cell 400 and the capacity of the individual battery cells.

[0069] Furthermore, such as Figure 3 As shown, the adapter piece 300 is entirely located within the groove 111; that is, the surface of the bent portion 320 facing the cell 400 is also located within the groove 111, thereby further improving the space utilization of the battery cell. Furthermore, by having the adapter piece 300 entirely located within the groove 111, as... Figure 2 and Figure 3 As shown, the end face of the battery cell 400 facing the cover plate 100 can abut against the inner surface 110 of the cover plate 100.

[0070] In some alternative embodiments, such as Figure 8 As shown, in the two battery cells 400, each battery cell 400 includes a facing surface 420 facing the other battery cell 400 and a facing surface 430 disposed opposite to the facing surface 420. The facing surface 420 and the facing surface 430 are disposed opposite to each other in the second direction Y.

[0071] For example, each tab 410 includes multiple layers of tabs (not shown in the figure) arranged side-by-side along the thickness direction (i.e., the second direction Y) of the cell 400 and having the same polarity. After passing over the free end 321 of the bending portion 320, each of the multiple tabs bends towards the back face 430 to connect with the surface of the bending portion 320 facing the main body 310. In this embodiment, the distance between the tab closest to the back face 430 and the back face 420 is W1, and the thickness of the cell 400 is W2. W1 / W2 = 0 to 1 / 4, allowing for a larger number of tabs to meet high-power input / output requirements. When W1 / W2 is greater than 1 / 4, it indicates a smaller number of tabs 410 in the cell 400, potentially resulting in some cells 400 having no tabs 410 leading out, affecting the capacity of the cell 400. For example, the values ​​of W1 / W2 are 0, 0.1, 0.2, and 0.25.

[0072] To prevent the cover plate 100 from becoming too heavy, such as Figure 1 and Figure 7As shown, the outer surface 120 of the cover plate 100 has a protrusion 130 corresponding to the groove 111, so that the cover plate 100 does not need to be too thick to form the groove 111 for accommodating the adapter piece 300 and the tab 410. This allows the cover plate 100 to have a smaller weight, and the battery cell to have a smaller weight, which is beneficial for the lightweighting of the battery cell. Furthermore, the protrusion 130 allows the thickness of the portion of the cover plate 100 with the groove 111 to be consistent with the thickness of other areas. If the electrode post 200 is placed on the protrusion 130, this ensures the assembly strength and reliability of the cover plate 100 and the electrode post 200. In some optional embodiments, the cover plate 100 can be manufactured by a mold, in which case the protrusion 130 and the groove 111 are obtained through corresponding structures on the mold. It is also understood that the cover plate 100 can be formed by stamping, in which case the groove 111 and the protrusion 130 are stamped simultaneously.

[0073] To reduce the volume occupied by the protrusion 130 in the battery and power device, the width of the protrusion 130 should be as small as possible. In some alternative embodiments, the width direction of the protrusion 130 is the same as the width direction of the cover plate 100, and both are in the second direction Y. Figure 9 As shown, the width of the protrusion 130 is 'a', and the width of the cover plate 100 is 'b', where 0.2b ≤ a ≤ 0.9b. The ratio of the width of the protrusion 130 to the width of the cover plate 100 should not be too large. That is, the distance between the edge of the width of the protrusion 130 and the edge of the width of the cover plate 100 should preferably be larger, for example, greater than or equal to 5mm. In this way, the cover plate 100 can be better formed on the mold, ensuring the flatness of the edge of the cover plate 100, so that there will be no explosion points or other phenomena when welding it with the shell 500. The ratio of the width of the protrusion 130 to the width of the cover plate 100 should not be too large. If the width of the protrusion 130 is small, the width of the groove 111 will be small, which will increase the assembly difficulty of the adapter piece 300 and the electrode 410. If the electrode post 200 is set on the protrusion 130, the width of the protrusion 130 must be at least greater than the diameter of the electrode post 200. When the electrode post is fixed to the cover plate 100 by an insulating component, the width of the protrusion 130 should be greater than the maximum width of the insulating component. For example, a = 0.2b, a = 0.4b, a = 0.6b, a = 0.7b, a = 0.8b, a = 0.9b.

[0074] Further optionally, 0.4b≤a≤0.7b, that is, the width of the protrusion 130 is about half the width of the cover plate 100. This satisfies the flatness of the edge of the cover plate 100 and also reduces the assembly difficulty of the adapter piece 300 in the groove 111. In some optional embodiments, the center of the protrusion 130 in its width direction coincides with the center of the cover plate 100 in its width direction. That is, the protrusion 130 is located at the center of the cover plate 100, which facilitates the symmetrical arrangement of the adapter piece 300, the two cells 400 and the tab 410, so as to make full use of the internal space of the battery cell.

[0075] In this embodiment, when the battery cell includes a terminal post 200, the terminal post 200 is mounted on the cover plate 100. In this embodiment, one end of the terminal post 200 is connected to the surface of the main body 310 on the side opposite to the bent portion 320, so that the tab 410 is connected to the terminal post 200 via the adapter piece 300. For example, as shown... Figure 6 As shown, the pole post 200 includes a first end 210 and a second end 220 disposed opposite to each other in the axial direction, wherein the first end 210 is located on the top surface of the cover plate 100, and the end face of the second end 220 is connected to the surface of the main body 310.

[0076] In some alternative embodiments, such as Figure 5 As shown, the main body 310 is provided with a through hole 330, which extends through the main body 310 along its thickness direction. One end of the electrode post 200 is connected to the wall of the through hole 330, and the end face of one end of the electrode post 200 is flush with the surface of the main body 310 facing the bend 320, and is connected to the extension 412 of the tab 410. Thus, in this embodiment, the electrode post 200 is electrically connected to both the adapter piece 300 and directly connected to the tab 410, improving the stability of current transmission between the tab 410 and the electrode post 200, and is suitable for high-power charging and discharging of individual battery cells.

[0077] For example, the through hole 330 is a stepped hole, including a large hole section 331 and a small hole section 332. The large hole section 331 extends to the surface of the main body 310 facing away from the bending portion 320. Correspondingly, the second end 220 of the pole post 200 is provided with a stepped structure 230. The stepped structure 230 abuts against the transition surface between the small hole section 332 and the large hole section 331 to define the relative position of the pole post 200 and the adapter piece 300, ensuring that the end face of the second end 220 of the pole post 200 is flush with the surface of the main body 310 facing the bending portion 320, thereby reducing the assembly difficulty of the pole post 200 and the adapter piece 300.

[0078] It is understandable that, such as Figure 1 As shown, the battery cell also includes a housing 500, which is connected to the cover plate 100 to form a housing space for accommodating and limiting the cell 400.

[0079] In the battery cell provided in this embodiment, a groove 111 and a protrusion 130 are designed on the cover plate 100. The groove 111 accommodates the entire adapter piece 300 and the tab 410, making full use of the space in the thickness direction of the cover plate 100, improving the space utilization rate of the battery cell, and increasing the capacity of the battery cell of the same size. On this basis, the tab 410 extends from the inside of the cell 400, which can ensure that all tabs 410 can be accommodated in the groove 111 as much as possible.

[0080] Furthermore, the bent portion 320 of the adapter piece 300 is welded to the extension portion 412 of the tab 410 while perpendicular to the main body portion 310. After welding, it is folded and stored in the groove 111. This design allows the tab 410 and the adapter piece 300 to be welded when the two cells 400 are in a combined state, so the cover plate 100 will not interfere with the cells 400. In addition, the welding position of the tab 410 and the adapter piece 300 is not on the same plane as the welding position of the terminal post 200 and the adapter piece 300, avoiding interference between the welding areas of the two. Since they are not on the same plane, the size of the welding area of ​​the tab 410 is not limited by the size of the welding area of ​​the terminal post 200. Compared with the prior art, the welding area of ​​the tab 410 can be made larger. With a larger welding area, the current-carrying area of ​​the tab 410 will also be larger, which can improve the charging and discharging rate of the battery cell.

[0081] In addition, in this embodiment, the tabs 410 can be made very short, that is, the length of each tab can be relatively short, thereby avoiding the stacking of tabs 410, further reducing the space waste caused by the length of tabs 410, and ensuring that all tabs can be stored in the groove 111.

[0082] It should also be noted that the overall cross-sectional area of ​​the adapter piece 300 in this embodiment is large, and the width of the groove 111 does not limit the cross-sectional area of ​​the adapter piece 300. This makes the cross-sectional area of ​​the adapter piece 300 in this embodiment related to the length of the groove 111. Since the adapter piece 300 is foldable, that is, the bending portion 320 can be bent to one side of the main body portion 310, the dimension of the adapter piece 300 in the length direction can be designed to be longer. That is, the dimension of the adapter piece 300 in the second direction Y can be larger, thereby increasing the cross-sectional area of ​​the adapter piece 300. The assembly process of the cover plate 100 and the battery cell 400 provided in this embodiment is simple and easy to implement.

[0083] Example 2

[0084] The difference between this embodiment and Embodiment 1 is that the connection position between the tab 410 and the adapter 300 is different.

[0085] Specifically, the extension 412 of the tab 410 is located on the side of the corresponding bend 320 away from the main body 310. That is, the extension 412 is connected to the side of the bend 320 away from the main body 310. The bend 320 and the extension 412 can have a large connection area, thereby ensuring the connection strength and reliability between the tab 410 and the adapter piece 300.

[0086] The other structures in this embodiment are similar to the corresponding structures in Embodiment 1 and have similar beneficial effects, so they will not be described again in this embodiment.

[0087] Example 3

[0088] The difference between this embodiment and Embodiment 1 lies in the structure of the bent portion 320 of the adapter piece 300.

[0089] Specifically, such as Figure 10 As shown, the free end 321 of the bent portion 320 is covered with a buffer layer 340. The buffer layer 340 can play a buffering role, thereby avoiding hard contact between the free end 321 and the connection portion 411 of the tab 410, thus protecting the connection portion 411 of the tab 410 and ensuring the integrity of the tab 410.

[0090] For example, the buffer layer 340 is an elastic structure to ensure the protection of the connection portion 411. For example, the material of the buffer layer 340 is silicone, rubber, etc., and this embodiment does not limit this.

[0091] The other structures in this embodiment are similar to the corresponding structures in Embodiment 1 and have similar beneficial effects, so they will not be described again in this embodiment.

[0092] Example 4

[0093] The difference between this embodiment and Embodiment 1 lies in the structure of the pole post 200.

[0094] Specifically, in this embodiment, when the battery cell also includes a terminal post 200, the terminal post 200 and the adapter piece 300 are integrally formed. In this case, the welding steps of the terminal post 200 and the adapter piece 300 are reduced, the assembly efficiency of the battery cell is improved, the connection strength between the adapter piece 300 and the terminal post 200 is improved, and the overall resistance of the adapter piece 300 and the terminal post 200 is also lower.

[0095] The other structures in this embodiment are similar to the corresponding structures in Embodiment 1 and have similar beneficial effects, so they will not be described again in this embodiment.

[0096] Secondly, this embodiment provides a battery, including the battery cell as described in the first aspect. The battery provided in this embodiment has a large capacity and can have a high energy density.

[0097] Thirdly, this embodiment provides an electrical device, including a single battery cell as described in the first aspect, or a battery as described in the second aspect. The electrical device provided in this embodiment has a large capacity and can have a high energy density.

[0098] For example, electrical devices include, but are not limited to: mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0099] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cell, comprising a cover plate (100), an adapter plate (300), and two battery cells (400), wherein the cover plate (100) comprises an inner surface (110) facing the battery cells (400) and an outer surface (120) facing away from the battery cells (400); characterized in that: Two of the battery cells (400) are arranged opposite each other, and each of the battery cells (400) extends an electrode tab (410) from the inside of its end face outward; The inner surface (110) of the cover plate (100) is provided with a groove (111), at least part of the adapter piece (300) is located in the groove (111), the adapter piece (300) includes a main body (310) and two bent parts (320), each of the bent parts (320) is bent to the side of the main body (310) facing the cell (400), and the tab (410) of one of the cells (400) is connected to one of the bent parts (320).

2. The battery cell according to claim 1, characterized in that, Each of the tabs (410) includes a connecting portion (411) and an extension portion (412), the connecting portion (411) being led out from the battery cell (400); The extension (412) is located between the corresponding bend (320) and the main body (310), or the extension (412) is located on the side of the corresponding bend (320) facing away from the main body (310).

3. The battery cell according to claim 2, characterized in that, Two of the bending portions (320) are connected to the edges on both sides of the main body (310), and the extension portion (412) passes around the free end (321) of the corresponding bending portion (320) and is fixed to the surface of the bending portion (320) facing the main body (310).

4. The battery cell according to claim 3, characterized in that, The extension (412) is welded to the bend (320) to form a welded portion, which passes through the bend (320) and extends to the extension (412).

5. The battery cell according to claim 3, characterized in that, The edge of the free end (321) of the bent portion (320) is a rounded chamfer, or the free end (321) of the bent portion (320) is covered with a buffer layer (340).

6. The battery cell according to claim 3, characterized in that, There is a gap between the connecting part (411) and the free end (321) of the corresponding bending part (320).

7. The battery cell according to claim 1, characterized in that, The surface of the tab (410) facing the cell (400) is located in the groove (111).

8. The battery cell according to claim 7, characterized in that, The adapter piece (300) is entirely located in the groove (111).

9. The battery cell according to claim 1, characterized in that, The battery cell (400) includes a facing surface (420) facing another battery cell (400) and a facing surface (430) disposed opposite to the facing surface (420); The tab (410) includes multiple layers of tabs arranged side by side along the thickness direction of the cell (400) and having the same polarity. All layers of tabs are bent toward the back face (430). The distance between the tab closest to the back face (430) and the front face (420) is W1. The thickness of the cell (400) is W2. W1 / W2 = 0 to 1 / 4.

10. The battery cell according to claim 1, characterized in that, The outer surface (120) of the cover plate (100) is provided with a protrusion (130) corresponding to the position of the groove (111).

11. The battery cell according to claim 10, characterized in that, The width direction of the protrusion (130) is the same as the width direction of the cover plate (100). The width of the protrusion (130) is a, and the width of the cover plate (100) is b, where 0.2b≤a≤0.9b.

12. The battery cell according to claim 11, characterized in that, 0.4b≤a≤0.7b, the center of the protrusion (130) in its width direction coincides with the center of the cover plate (100) in its width direction.

13. The battery cell according to any one of claims 1-12, characterized in that, The battery cell further includes a terminal post (200), which is mounted on the cover plate (100). One end of the terminal post (200) is connected to the surface of the main body (310) facing away from the bent portion (320); or, The main body (310) is provided with a through hole (330), one end of the pole (200) is connected to the hole wall of the through hole (330), and the end face of one end of the pole (200) is flush with the surface of the main body (310) facing the bent part (320) and connected to the tab (410).

14. The battery cell according to any one of claims 1-12, characterized in that, The battery cell also includes a terminal post (200), which is integrally formed with the adapter plate (300).

15. The battery cell according to any one of claims 1-12, characterized in that, The adapter plate (300) also includes a thinned portion connecting the bent portion (320) and the main body portion (310), the thickness of which is less than the thickness of the main body portion (310).

16. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-15.

17. An electrical appliance, characterized in that, Includes the battery cell according to any one of claims 1-15, or the battery according to claim 16.

Images