Pouch-type battery cell, method for bending electrode tabs of pouch-type battery cell, and battery pack

Abstract

The present invention relates to the field of battery technology, and more particularly to a pouch-type battery cell, a method for bending electrode tabs for a pouch-type battery cell, and a battery pack. The pouch-type battery cell includes a cell body and an electrode tab. The electrode tab includes a body connection portion, an extension portion, and high and low voltage connection portions. The body connection portion is connected to the cell body and extends along the length of the cell body. The extension portion extends along the height of the cell body. The high and low voltage connection portions protrude from the cell body on its upper surface in the height direction. The electrode tab can be bent at the connection position between the body connection portion and the extension portion and the connection position between the extension portion and the high and low voltage connection portions. This allows the high and low voltage connection portions of the electrode tab of the pouch-type battery cell to be bent upward in the height direction of the pouch-type battery cell, facilitating subsequent electrode tab welding and sample placement. Compared to conventional techniques in which electrode tab welding and sample placement are performed at both ends of the length of a cell stack, this eliminates the need to secure excessive space in the width direction of the battery pack, thereby improving the space utilization rate and energy density of the battery pack.

Description

[Technical Field]

[0001] The present invention relates to the field of battery technology, and more particularly to a pouch-type battery cell, a method for bending electrode tabs of a pouch-type battery cell, and a battery pack. [Background technology]

[0002] Pouch-type battery cells are an important component of power batteries and a major development direction. A typical power battery includes a housing and a cell stack. The cell stack is installed in the housing and is formed by stacking multiple pouch-type battery cells. In the prior art, to sample the temperature and voltage inside a power battery, insulating supports are usually installed at both ends of the cell stack in the longitudinal direction, and current collector plates are fixed on the insulating supports. Then, electrode tabs of the cell stack are extended from both ends of the longitudinal direction and bent and fixed to the current collector plates on the insulating supports to achieve electrical connection with the current collector plates. Finally, the sampled components are electrically connected to the current collector plates, completing the sampling arrangement of the power battery.

[0003] However, conventional sampling arrangement methods have the following drawbacks: 1) The welding of the electrode tabs and current collector plates of the cell stack is located at the end face in the longitudinal direction of the cell stack, making the welding operation inconvenient. 2) Because the sampling arrangement is located at the end face in the longitudinal direction of the cell stack, the arrangement is difficult and the length of the sampling wire increases, wasting space. 3) The need to arrange insulating supports at the end face in the longitudinal direction of the cell stack and the restriction on the welding direction of the electrode tabs mean that excessive space must be secured at the end face in the longitudinal direction of the cell stack, reducing the space utilization rate of the battery pack.

[0004] Therefore, there is an urgent need for a pouch-type battery cell to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0005] A first object of the present invention is to provide a pouch-type battery cell that can facilitate subsequent electrode tab welding and sampling placement, and improve the space utilization rate of the battery pack.

[0006] A second object of the present invention is to provide a method for bending the electrode tabs of a pouch-type battery cell, which can facilitate subsequent electrode tab welding and sampling arrangement, improve the space utilization rate of the battery pack, and increase the energy density of the battery pack.

[0007] A third object of the present invention is to provide a battery pack that, by applying the above-mentioned pouch-type battery cell, facilitates electrical connection and sampling arrangement of electrode tabs between multiple pouch-type battery cells in the battery pack, and can further increase the space utilization rate and energy density of the battery pack. [Means for solving the problem]

[0008] To achieve the above objectives, the following technical solutions are provided:

[0009] In a first aspect, a pouch-type battery cell is provided, the pouch-type battery cell including a cell body and electrode tabs, the two electrode tabs being symmetrically connected to both ends of the cell body in the longitudinal direction, the electrode tabs including a body connection portion, an extension portion, and a high- and low-voltage connection portion connected in that order, the body connection portion being connected to the cell body and extending along the longitudinal direction of the cell body, the extension portion being extended along the height direction of the cell body, the high- and low-voltage connection portion being connected to an upper end of the extension portion and protruding upward from the cell body, and the electrode tabs being bendable at the connection position between the body connection portion and the extension portion and the connection position between the extension portion and the high- and low-voltage connection portion.

[0010] In an optional solution of the pouch-type battery cell, the thickness of the electrode tab is D1, the length of the body connection portion in the height direction of the cell body is L1, the length of the extension portion in the height direction of the cell body is L2, the length of the high and low voltage connection portion in the height direction of the cell body is L3, the width of the body connection portion is W1, the width of the extension portion is W2, and the width of the high and low voltage connection portion is W3, where D1, L1, L2, L3, W1, W2, and W3 satisfy the conditions of 0.1 mm≦D1≦1 mm, and / or 0.5≦(L2+L3-L1) / L1≦5, and / or 0.2≦W3 / (W1+W2)≦1.

[0011] In a second aspect, there is provided a method for bending an electrode tab of a pouch-type battery cell, the pouch-type battery cell including a cell body and an electrode tab, the electrode tab including a body connection portion, an extension portion, and a high- and low-voltage connection portion connected in that order, the method including: bending the electrode tab in the thickness direction of the cell body at a connection position between the body connection portion and the extension portion, thereby extending the extension portion along the thickness direction of the cell body; and bending the electrode tab in a direction toward or away from the cell stack at a connection position between the extension portion and the high- and low-voltage connection portion, thereby causing the high- and low-voltage connection portion to protrude from the cell body.

[0012] In an optional method for bending the electrode tabs of the pouch-type battery cell, the included angle between the main body connection portion and the extension portion is α, the included angle between the extension portion and the high and low voltage connection portion is β, the bending radius between the main body connection portion and the extension portion is R1, the bending radius between the extension portion and the high and low voltage connection portion is R2, and the thickness of the electrode tab is D1, where α, β, R1, and R2 satisfy the conditions 60°≦α ≦120°, and / or 60°≦β ≦120°, and / or 0.5D1≦R1≦25D1, and / or 0.5D1≦R2≦25D1.

[0013] In a third aspect, a battery pack is provided that includes a cell stack formed by connecting a plurality of cell groups in series, the cell groups including some of the above-mentioned pouch-type battery cells, and some of the pouch-type battery cells are stacked and electrically connected along their thickness direction.

[0014] As an optional solution of the battery pack, in one cell group, all electrode tabs located on the same side of some of the pouch-type battery cells are stacked to form a single electrode tab structure, the body connection portions of the electrode tabs form the body connection structure of the electrode tab structure, the extension portions of the electrode tabs form the extension structure of the electrode tab structure, the high and low voltage connection portions of the electrode tabs form the high and low voltage connection structures of the electrode tab structure, and the body connection structure and the extension structure are bent to form an included angle, and the extension structure and the high and low voltage connection structure are bent to form an included angle.

[0015] In the battery pack, the high and low voltage connection structures may alternatively extend toward the cell body, or may alternatively extend away from the cell body.

[0016] In an optional solution of the battery pack, in two adjacent cell groups, the two electrode tab structures at one end of the two cell groups are at least partially overlapping and electrically connected, or the two electrode tab structures at one end of the two cell groups are indirectly electrically connected.

[0017] As an optional solution of the battery pack, the battery pack further includes an insulating support, the insulating support includes a first support portion, the first support portion is not lower than the upper surface of the cell stack in the height direction, and the high and low voltage connection structure of the electrode tab structure is supported by being positionally restricted by the first support portion.

[0018] As an optional solution of the battery pack, the battery pack further includes a sampling assembly, the sampling assembly including a voltage sampling member and a temperature sampling member, the voltage sampling member being connected to the high and low voltage connection structure, and the temperature sampling member being disposed on the upper surface of the cell stack in the height direction. [Effects of the Invention]

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The pouch-type battery cell provided by the present invention includes a cell body and an electrode tab, and the electrode tab includes a body connection portion, an extension portion, and a high- and low-voltage connection portion connected in this order, where the body connection portion is connected to the cell body and extends along the length of the cell body, the extension portion extends along the height of the cell body, the high- and low-voltage connection portion is connected to an upper end of the extension portion and protrudes upward from the cell body, and the electrode tab can be bent at the connection position between the body connection portion and the extension portion and the connection position between the extension portion and the high- and low-voltage connection portion. This configuration allows the high- and low-voltage connection portions of the electrode tab of the pouch-type battery cell to be bent upward in the height direction of the pouch-type battery cell, making subsequent electrode tab welding and sample placement easier. Compared to the conventional technology in which electrode tab welding and sample placement are performed at both ends in the length direction of the cell stack, the solution provided by the present invention improves the convenience and efficiency of subsequent electrode tab welding and sample placement, and at the same time, eliminates the need to secure excessive space in the length direction of the battery pack, thereby improving the space utilization rate and energy density of the battery pack.

[0021] The electrode tab folding method of the pouch-type battery cell provided by the present invention can facilitate subsequent electrode tab welding and sampling arrangement, improve the space utilization rate of the battery pack, and increase the energy density of the battery pack.

[0022] The battery pack provided by the present invention employs the above-described pouch-type battery cell, which facilitates the electrical connection and sampling arrangement of electrode tabs between multiple pouch-type battery cells in the battery pack, and further improves the space utilization rate and energy density of the battery pack. [Brief explanation of the drawings]

[0023] In order to more clearly explain the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on the content of the embodiments of the present invention and these drawings without any creative efforts.

[0024] [Figure 1] 1 is a structural schematic diagram of a pouch-type battery cell provided by an embodiment of the present invention; [Figure 2] 1 is a structural schematic diagram of an electrode tab provided by an embodiment of the present invention; [Figure 3] 3 is a flowchart of a method for bending electrode tabs of a pouch-type battery cell provided by an embodiment of the present invention. [Figure 4] 1 is a structural schematic diagram of a pouch-type battery cell provided by an embodiment of the present invention in a first folded state; [Figure 5] FIG. 5 is a structural schematic diagram of the electrode tab in FIG. 4. [Figure 6] 2 is a structural schematic diagram of a pouch-type battery cell provided by an embodiment of the present invention in a second folded state; FIG. [Figure 7] FIG. 7 is a structural schematic diagram of the electrode tab in FIG. 6. [Figure 8] 1 is an exploded view of a first battery pack provided by an embodiment of the present invention. FIG. [Figure 9] FIG. 9 is an enlarged view of part A in FIG. 8. [Figure 10] 2 is a structural schematic diagram of a second battery pack provided by an embodiment of the present invention; [Figure 11] FIG. 11 is an enlarged view of part B in FIG. [Figure 12] FIG. 2 is a plan view of a second battery pack provided by an embodiment of the present invention. [Figure 13] 1 is a structural schematic diagram of a third battery pack provided by an embodiment of the present invention. [Figure 14] FIG. 14 is an enlarged view of part C in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the present invention will be further described below through specific embodiments in combination with the drawings.

[0026] In the description of the present invention, unless otherwise clearly specified or limited, the terms "interconnect," "connect," and "fix" should be interpreted broadly, and may refer to, for example, a fixed connection, a detachable connection, an integral molding, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, an internal connection between two components, or an interactive relationship between two components. Those skilled in the art can understand the specific meanings of the above-mentioned terms in the present invention according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified or limited, the expression "above" or "below" a second feature may include cases where the first and second features are in direct contact with each other, or cases where the first and second features are not in direct contact but are in contact via another feature between them. Furthermore, the expressions "above," "above," and "on the upper surface" of a first feature may include cases where the first feature is directly above and diagonally above the second feature, or simply indicate that the horizontal height of the first feature is higher than that of the second feature. The expressions "below," "below," and "on the lower surface" of a first feature may include cases where the first feature is directly below and diagonally below the second feature, or simply indicate that the horizontal height of the first feature is lower than that of the second feature.

[0028] In the description of the present invention, terms indicating orientations or positional relationships, such as "upper," "lower," "left," and "right," are based on the orientations or positional relationships shown in the drawings and are merely intended to facilitate the description and simplify the operation, and do not indicate or suggest that a specified device or component must have a specific orientation, or be configured or operated in a specific orientation, and therefore should not be understood as a limitation on the present invention. Furthermore, terms such as "first" and "second" are merely used to distinguish between the descriptions and do not have any special meaning.

[0029] Figure 1 shows a schematic diagram of the structure of a pouch-type battery cell 10 provided by the present invention. As shown in Figure 1, the pouch-type battery cell 10 includes a cell body 11 and electrode tabs 12, with the two electrode tabs 12 symmetrically connected to both ends of the cell body 11 in the longitudinal direction. The two electrode tabs 12 are a positive electrode tab and a negative electrode tab, respectively.

[0030] It should be noted that in the present invention, the structural shapes of the positive electrode tab and the negative electrode tab may be the same or different, but the overall inventive concept of both is the same. Therefore, for ease of understanding, the electrode tab 12 referred to below may be a positive electrode tab or a negative electrode tab, and the positive electrode tab and the negative electrode tab may adopt the same structural shape or may select different structural shapes under the overall same inventive concept, but examples will not be provided here for each one.

[0031] 2 is a schematic structural diagram of the electrode tab 12 provided by the present invention. As shown in a combination of FIG. 2 and FIG. 1, the electrode tab 12 includes a body connection portion 121, an extension portion 122, and a high and low voltage connection portion 123, which are connected in this order. The body connection portion 121 is connected to the cell body 11 and extends along the length of the cell body 11. The extension portion 122 extends along the height of the cell body 11. The high and low voltage connection portion 123 is connected to the upper end of the extension portion 122 and protrudes upward from the cell body 11 on the upper surface in the height direction. The electrode tab 12 can be bent at the connection position between the body connection portion 121 and the extension portion 122 and at the connection position between the extension portion 122 and the high and low voltage connection portion 123. This configuration allows the high and low voltage connection portions 123 of the electrode tabs 12 of the pouch-type battery cells 10 to be bent upward in the height direction of the pouch-type battery cells 10, making it easier to subsequently weld the electrode tabs 12 and place samples. Compared to the conventional technology in which the welding and sample placement of the electrode tabs 12 is performed at both ends in the length direction of the cell stack 2, the solution provided by the present invention improves the convenience and efficiency of the welding and sample placement of the subsequent electrode tabs 12. At the same time, it is not necessary to secure excessive space in the length direction of the battery pack, thereby improving the space utilization rate and energy density of the battery pack.

[0032] Continuing to refer to FIG. 2 , the thickness of the electrode tab 12 is defined as D1, the length of the body connection portion 121 in the height direction of the cell body 11 is defined as L1, the length of the extension portion 122 in the height direction of the cell body 11 is defined as L2, the length of the high- and low-voltage connection portion 123 in the height direction of the cell body 11 is defined as L3, the width of the body connection portion 121 is defined as W1, the width of the extension portion 122 is defined as W2, and the width of the high- and low-voltage connection portion 123 is defined as W3. Optionally, the value range of the thickness D1 of the electrode tab 12 is 0.1 mm≦D1≦1 mm. This setting ensures the structural strength of the entire electrode tab 12 while also allowing the electrode tab 12 to be easily bent. Optionally, L1, L2, and L3 satisfy the relationship 0.5≦L2+L3−L1 / L1≦5. This setting ensures the structural strength of the entire electrode tab 12 while also allowing the electrode tab 12 to be easily bent. Optionally, W1, W2, and W3 satisfy 0.2≦W3 / W1+W2≦1 and / or W1≦W2. For example, the width W2 of the extension portion 122 is equal to the width W3 of the high- and low-voltage connection portion 123. Of course, in other embodiments, the width W3 of the high- and low-voltage connection portion 123 may be greater than the width W2 of the extension portion 122. However, specific examples can be designed as needed, and therefore will not be described here.

[0033] FIG. 3 is a flowchart of a method for bending electrode tabs of a pouch-type battery cell provided by the present invention. As shown in FIG. 3, the method for bending electrode tabs of a pouch-type battery cell includes the following steps: In S100, the cell body 11 is bent in the thickness direction at the connection position between the body connection portion 121 and the extension portion 122, so that the extension portion 122 extends along the thickness direction of the cell body 11; in S200, the high- and low-voltage connection portion 123 is bent toward or away from the cell body 11 at the connection position between the extension portion 122 and the high- and low-voltage connection portion 123, so that the high- and low-voltage connection portion 123 protrudes from the cell body 11. This electrode tab bending method facilitates subsequent electrode tab welding and sample placement, improves the space utilization rate of the battery pack, and increases the energy density of the battery pack.

[0034] FIG. 4 is a structural schematic diagram of a pouch-type battery cell 10 provided by the present invention in a first folded state. FIG. 5 is a structural schematic diagram of the electrode tab 12 of FIG. 4. As shown in FIGS. 4 and 5, the electrode tab 12 is folded in the thickness direction of the cell body 11 at the connection position between the body connection portion 121 and the extension portion 122, so that the extension portion 122 and the high and low voltage connection portion 123 are positioned at the longitudinal ends of the cell body 11. The electrode tab 12 is then folded toward the cell body 11 at the connection position between the extension portion 122 and the high and low voltage connection portion 123, so that the high and low voltage connection portion 123 is folded upward in the height direction of the cell body 11. The high and low voltage connection portion 123 is used for welding between the electrode tabs 12 of the pouch-type battery cell 10 and for sampling arrangement.

[0035] FIG. 6 is a structural schematic diagram of a pouch-type battery cell 10 provided by the present invention in a second folded state. FIG. 7 is a structural schematic diagram of the electrode tab 12 of FIG. 6. As shown in FIGS. 6 and 7, the electrode tab 12 is folded in the thickness direction of the cell body 11 at the connection position between the body connection portion 121 and the extension portion 122, so that the extension portion 122 and the high and low voltage connection portion 123 are positioned at the longitudinal ends of the cell body 11. The electrode tab 12 is then folded away from the cell body 11 at the connection position between the extension portion 122 and the high and low voltage connection portion 123, so that the high and low voltage connection portion 123 is folded upward in the height direction of the cell body 11. The high and low voltage connection portion 123 is used for welding between the electrode tabs 12 of the pouch-type battery cell 10 and for sampling arrangement.

[0036] It should be noted that both of the above-mentioned bending methods for the electrode tabs 12 can be applied to the cell stack 2. However, the specific method to be adopted can be selected based on the specific assembly scenario and requirements, and therefore will not be described in detail here. Regardless of whether the high and low voltage connection portions 123 are bent toward the cell body 11 or away from the cell body 11, the bending conditions for the electrode tabs 12 satisfy the following requirements: α is the included angle between the body connection portion 121 and the extension portion 122, and α satisfies 60°≦α≦120°. The specific bending angle between the body connection portion 121 and the extension portion 122 is not limited here, as it can be bent according to actual assembly requirements. β is the included angle between the extension portion 122 and the high and low voltage connection portions 123, and β satisfies 60°≦β≦120°. The specific bending angle between the extension portion 122 and the high- and low-voltage connecting portion 123 is not limited here, as it can be bent according to actual assembly requirements. If the bending radius between the body connecting portion 121 and the extension portion 122 is R1, the relationship between R1 and the thickness D1 of the electrode tab 12 satisfies 0.5D1≦R1≦25D1. This setting facilitates bending between the body connecting portion 121 and the extension portion 122 while ensuring the structural strength of the bent portion. If the bending radius between the extension portion 122 and the high- and low-voltage connecting portion 123 is R2, the relationship between R2 and the thickness D1 of the electrode tab 12 satisfies 0.5D1≦R2≦25D1. This setting facilitates bending between the extension portion 122 and the high- and low-voltage connecting portion 123 while ensuring the structural strength of the bent portion.

[0037] FIG. 8 shows an exploded view of a first battery pack provided by the present invention. As shown in FIG. 8, the battery pack includes a cell stack 2, a first side panel 3, a second side panel 4, an insulating support 5, and a frame 6. The first side panel 3 and the second side panel 4 are located at both ends of the thickness of the cell stack 2, and the two insulating supports 5 are located at both ends of the length of the cell stack 2. The first side panel 3, the second side panel 4, the two insulating supports 5, and the cell stack 2 constitute a battery cell assembly, and the entire battery cell assembly is mounted within a frame 6. For example, the battery pack may further include a top cover and a bottom panel, which seal both ends of the frame 6 in the height direction. The cell stack 2 is formed by connecting multiple cell groups in series. Each cell group includes several of the above-mentioned pouch-type battery cells 10. Within one cell group, several pouch-type battery cells 10 are stacked and electrically connected, but they may be connected in parallel or in series. The high and low voltage connection structures 213 extend in a direction toward the cell body 11. Alternatively, the high and low voltage connection structures 213 extend in a direction away from the cell body 11.

[0038] An example will be described in which pouch-type battery cells 10 in a cell group are connected in parallel. Fig. 9 is an enlarged view of portion A in Fig. 8. As shown in a combination of Fig. 9 and Fig. 8, when all of the electrode tabs 12 on the same side of several pouch-type battery cells 10 in one cell group are stacked to form a single electrode tab structure 21, the body connection portions 121 of the electrode tabs 12 form the body connection structure 211 of the electrode tab structure 21, the extension portions 122 of the electrode tabs 12 form the extension structure 212 of the electrode tab structure 21, and the high and low voltage connection portions 123 of the electrode tabs 12 form the high and low voltage connection structure 213 of the electrode tab structure 21. In other words, multiple pouch-type battery cells 10 are connected in parallel, and the electrode tabs 12 of the pouch-type battery cells 10 are stacked to form the electrode tab structure 21. For example, a plurality of positive electrode tabs are stacked to form a positive electrode tab structure, a plurality of negative electrode tabs are stacked to form a negative electrode tab structure, and the positive electrode tab structures and negative electrode tab structures between a plurality of cell groups are connected in series to form the cell stack 2. Optionally, the body connecting structure 211 and the extension structures 212 are bent to form an included angle, and the included angle range between the body connecting structure 211 and the extension structures 212 is 60°≦α≦120°. The extension structures 212 and the high and low voltage connecting structures 213 are bent to form an included angle, and the included angle range between the extension structures 212 and the high and low voltage connecting structures 213 is 60°≦β≦120°.

[0039] Continuing to refer to FIG. 9 , the positive electrode tab structure of one cell group and the negative electrode tab structure of another adjacent cell group are stacked relative to each other. That is, the extension structure 212 of the positive electrode tab structure and the extension structure 212 of the negative electrode tab structure are stacked and at least partially overlap, and the high and low voltage connection structure 213 of the positive electrode tab structure and the high and low voltage connection structure 213 of the negative electrode tab structure are stacked and at least partially overlap. That is, the electrode tab structures 21 between the cell groups shown in FIG. 8 are directly electrically connected and do not need to be electrically connected to the electrode tab structures 21 via the current collector plate 8. This saves the current collector plate 8, reduces manufacturing steps, reduces material costs, and improves manufacturing efficiency. Furthermore, because the high and low voltage connection structure 213 extends in a direction away from the cell stack 2, this configuration prevents heat from the electrode tab structure 21 from being transferred to the cell stack 2 and simultaneously improves the heat dissipation efficiency of the electrode tab structure 21.

[0040] 9 and 8 , the battery pack further includes an insulating support 5, which includes a first support portion 51 that is not lower than the upper surface of the cell stack 2 in the height direction, and the high and low voltage connection structure 213 of the electrode tab structure 21 is supported by being restricted in position by the first support portion 51. This configuration allows the high and low voltage connection structure 213 to be bent and placed on the first support portion 51 of the insulating support 5, thereby supporting the high and low voltage connection structure 213 and facilitating subsequent sample placement. Because the sample placement can be performed directly on the upper surface of the cell stack 2 in the height direction, there is no need to secure excessive space in the length direction of the frame 6, which improves the space utilization rate of the battery pack and increases the energy density of the battery pack.

[0041] 9 and 8 , the insulating support 5 further includes a second support 52, which is located at an end of the cell stack 2 in the longitudinal direction and abuts against an end surface of the cell stack 2 in the longitudinal direction. The first support 51 and the second support 52 can be installed vertically, and the first support 51 extends away from the cell stack 2 and is used to support the high and low voltage connection structure 213 of the electrode tab structure 21. Furthermore, a recess 521 is formed on the second support 52, and the electrode tab structure 21 of the cell stack 2 is installed opposite the recess 521, thereby preventing the second support 52 from pressing against the electrode tab structure 21 after assembly.

[0042] As shown in a combination of Figures 9 and 8, the insulating support 5 further includes a sealing portion 53, which is connected to one end of the first support 51 away from the cell stack 2, and which protrudes upward from the first support 51 and is used to prevent the sealing adhesive from flowing out to the second support 52.

[0043] As shown in a combination of Figures 9 and 8, the insulating support 5 further includes fixing portions 54, two of which are connected to both ends of the first support portion 51, and two of which are fixedly connected to the first side plate 3 and the second side plate 4, respectively, and are used to fix the insulating support 5 between the first side plate 3 and the second side plate 4, and the cell stack 2 is located within the space surrounded by the first side plate 3, the second side plate 4, and the two insulating supports 5.

[0044] For example, the insulating support 5 can be integrally formed by injection molding using insulating plastic.

[0045] FIG. 10 is a structural schematic diagram of a second battery pack provided by an embodiment of the present invention. FIG. 11 is an enlarged view of portion B in FIG. 10. As shown in FIGS. 10 and 11, the battery pack includes a cell stack 2, a first side plate 3, a second side plate 4, and an insulating support 5. The first side plate 3 and the second side plate 4 are located at both ends of the cell stack 2 in the thickness direction, and the two insulating supports 5 are located at both ends of the cell stack 2 in the length direction, respectively. The cell stack 2 is located within a space surrounded by the first side plate 3, the second side plate 4, and the two insulating supports 5. The cell stack 2 is formed by connecting multiple cell groups in series. Each cell group includes several of the above-mentioned pouch-shaped battery cells 10, and within one cell group, several pouch-shaped battery cells 10 are stacked along the thickness direction and connected in parallel. In one cell group, all the electrode tabs 12 on the same side of several pouch-type battery cells 10 are stacked to form a single electrode tab structure 21, the body connection portions 121 of the electrode tabs 12 form the body connection structure 211 of the electrode tab structure 21, the extension portions 122 of the electrode tabs 12 form the extension structure 212 of the electrode tab structure 21, and the high and low voltage connection portions 123 of the electrode tabs 12 form the high and low voltage connection structure 213 of the electrode tab structure 21.

[0046] The second battery pack has the same structural layout as the first battery pack described above, but the main difference is that the high and low voltage connection structure 213 of the electrode tab structure 21 is bent in a different direction. The high and low voltage connection structure 213 of the second battery pack is bent toward the cell stack 2, while the high and low voltage connection structure 213 of the first battery pack is bent away from the cell stack 2.

[0047] Furthermore, to accommodate the difference in the bending method of the high- and low-voltage connection structure 213, the structure of the insulating support 5 of the second battery pack is also different from that of the insulating support 5 of the first battery pack. Referring to FIG. 10 , the insulating support 5 includes a first support portion 51, a second support portion 52, a sealing portion 53, and a fixing portion 54. The first support portion 51 is located on the upper surface of the cell stack 2 in the height direction, and the second support portion 52 extends to the end surface of the cell stack 2 in the length direction, approximately perpendicular to the first support portion 51, and is used to restrict and support the position of the cell stack 2 in the length direction. In addition, the second support portion 52 is provided with an escape groove 521 that allows the electrode tab structure 21 to pass through. After the electrode tab structure 21 passes through the escape groove 521, the high- and low-voltage connection structure 213 is bent toward the cell stack 2 and is supported by the first support portion 51 while being restricted in position. The sealing portion 53 is connected to one end of the first support portion 51 remote from the second support portion 52, and protrudes from the first support portion 51 in a direction away from the cell stack 2, and is used to prevent the sealing resin from flowing out into the cell stack 2. The first support portion 51 has fixing portions 54 provided on both ends in the thickness direction of the cell stack 2, and the two fixing portions 54 are fixedly connected to the first side plate 3 and the second side plate 4, respectively, and are used to attach the insulating support 5.

[0048] FIG. 12 is a plan view of a second battery pack according to an embodiment of the present invention. As shown in FIG. 12 , the battery pack further includes a sampling assembly 7, which includes a voltage sampling member 72 and a temperature sampling member 71. The voltage sampling member 72 is connected to the high- and low-voltage connection structure 213, and the temperature sampling member 71 is disposed on the upper surface of the cell stack 2 in the vertical direction. By disposing the sampling assembly 7 above the cell stack 2, the battery pack can fully utilize the vertical space, facilitating sampling arrangement and eliminating the need for excessive installation and operation space along the length of the battery pack frame 6, thereby improving the space utilization rate and increasing the energy density of the battery pack. For example, the number of temperature sampling members 71 is four, and the four temperature sampling members 71 are spaced apart on the upper surface of the cell stack 2 in the vertical direction. One voltage sampling member 72 is connected to two connected electrode tab structures 21. Naturally, in other embodiments, the number and placement positions of the temperature sampling members 71 may be other forms, and the number and placement method of the voltage sampling members 72 may also be other forms, but since they are not limited to the examples described above, we will not provide an example of each here.

[0049] 12 , the sampling assembly 7 further includes electrical wires 73, and several temperature sampling members 71 are communicatively connected to the battery management system of the battery pack via the electrical wires 73 to perform temperature sampling. Several voltage sampling members 72 are communicatively connected to the battery management system of the battery pack via the electrical wires 73 to perform voltage sampling.

[0050] FIG. 13 is a structural schematic diagram of a third battery pack provided by an embodiment of the present invention. FIG. 14 is an enlarged view of portion C in FIG. 13. As shown in FIGS. 13 and 14, the battery pack includes a cell stack 2, a first side plate 3, a second side plate 4, and an insulating support 5. The first side plate 3 and the second side plate 4 are located at both ends of the cell stack 2 in the thickness direction, and the two insulating supports 5 are located at both ends of the cell stack 2 in the length direction, respectively. The cell stack 2 is located in a space surrounded by the first side plate 3, the second side plate 4, and the two insulating supports 5. The cell stack 2 is formed by connecting multiple cell groups in series. Each cell group includes several of the above-mentioned pouch-shaped battery cells 10, and within one cell group, several pouch-shaped battery cells 10 are stacked along the thickness direction and connected in parallel. In one cell group, all the electrode tabs 12 on the same side of several pouch-type battery cells 10 are stacked to form a single electrode tab structure 21, the body connection portions 121 of the electrode tabs 12 form the body connection structure 211 of the electrode tab structure 21, the extension portions 122 of the electrode tabs 12 form the extension structure 212 of the electrode tab structure 21, and the high and low voltage connection portions 123 of the electrode tabs 12 form the high and low voltage connection structure 213 of the electrode tab structure 21.

[0051] The third battery pack has the same structural layout as the second battery pack described above, but differs mainly as follows: In the third cell stack 2, the electrode tab structures 21 of the cell groups are electrically connected via the current collector plates 8, whereas in the second cell stack 2, the electrode tab structures 21 of the cell groups are directly and partially overlapping and electrically connected. In addition, the electrode tab structures 21 of the cell groups in the first cell stack 2 are also directly and partially overlapping and electrically connected.

[0052] Furthermore, to accommodate the difference in the connection method of the electrode tab structures 21 of the cell groups in the cell stack 2, the structure of the insulating support 5 of the third battery pack is also different from that of the insulating support 5 of the second battery pack. Referring to FIG. 13 , the insulating support 5 includes a first support portion 51, a second support portion 52, a sealing portion 53, and a fixing portion 54. The first support portion 51 is located on the upper surface of the cell stack 2 in the height direction, and the second support portion 52 extends to the end surface of the cell stack 2 in the length direction, approximately perpendicular to the first support portion 51, and is used to restrict and support the position of the cell stack 2 in the length direction. In addition, the second support portion 52 is provided with two relief grooves 521 through which the electrode tab structures 21 of two adjacent cell groups can pass, respectively. After the electrode tab structures 21 pass through the relief grooves 521, the high- and low-voltage connection structures 213 are bent toward the cell stack 2 and are supported by the current collector plates 8 of the first support portion 51 while being restricted in position. The sealing portion 53 is connected to one end of the first support portion 51 remote from the second support portion 52, and protrudes from the first support portion 51 in a direction away from the cell stack 2, and is used to prevent the sealing resin from flowing out into the cell stack 2. The first support portion 51 has fixing portions 54 provided on both ends in the thickness direction of the cell stack 2, and the two fixing portions 54 are fixedly connected to the first side plate 3 and the second side plate 4, respectively, and are used to attach the insulating support 5.

[0053] The present invention further provides an electronic device including the above-described battery pack. By applying the above-described battery pack to the electronic device, the operating time of the electronic device can be extended. The electronic device of the present invention can be used for, but is not limited to, backup power sources, motors, automobiles, large-scale home storage batteries, energy storage, etc.

[0054] It should be noted that in the description herein, the reference to "some embodiments," "other embodiments," and the like means that the specific features, structures, materials, or characteristics described in combination with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, exemplary expressions of the above-mentioned terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0055] The above are merely preferred embodiments and applied technical principles of the present invention. As can be understood by those skilled in the art, the present invention is not limited to the specific embodiments described herein, and various obvious modifications, adjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to only the above embodiments, and can include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is defined by the appended claims. [Explanation of symbols]

[0056] 10 Pouch-type battery cells 11 Cell body 12 Electrode tab 121 Main unit connection part 122 Stretching section 123 High and low voltage connections 2-cell stack 21 Electrode tab structure 211 Main body connection structure 212 Stretched structure 213 High and low voltage connection structure 3 1st side plate 4 Second side plate 5 Insulating support 51 1st support part 52 Second support part 521 Undercut 53 Sealing part 54 Fixed part 6 frames 7. Sampling Assembly 71 Temperature sampling member 72 Voltage sampling member 73 Electric wire 8 Current collector plate

Claims

1. A cell body; An electrode tab; the two electrode tabs are connected symmetrically to both ends in the longitudinal direction of the cell body, the electrode tabs include a body connection portion, an extension portion, and a high and low voltage connection portion connected in that order, the body connection portion is connected to the cell body and extends along the longitudinal direction of the cell body, the extension portion extends along the height direction of the cell body, the high and low voltage connection portion is connected to an upper end of the extension portion and protrudes upward from the cell body, and the electrode tabs can be folded at a connection position between the body connection portion and the extension portion and a connection position between the extension portion and the high and low voltage connection portion.

2. If the thickness of the electrode tab is D1, the length of the main body connection portion in the height direction of the cell main body is L1, the length of the extension portion in the height direction of the cell main body is L2, the length of the high and low voltage connection portion in the height direction of the cell main body is L3, the width of the main body connection portion is W1, the width of the extension portion is W2, and the width of the high and low voltage connection portion is W3, then D1, L1, L2, L3, W1, W2, and W3 are 0.1 mm≦D1≦1 mm, and / or 0.5≦(L2+L3−L1) / L1≦5, and / or 0.2≦W3 / (W1+W2)≦1 2. The pouch-type battery cell according to claim 1, which satisfies the above conditions.

3. a pouch-type battery cell including a cell body and an electrode tab, the electrode tab including a body connection portion, an extension portion, and a high- and low-voltage connection portion connected in this order, the body connection portion being connected to the cell body and extending along the length direction of the cell body, the extension portion being extended along the height direction of the cell body, the high- and low-voltage connection portion being connected to an upper end of the extension portion and protruding upward from the cell body, and a method for bending an electrode tab of the pouch-type battery cell, comprising: Bending the cell body in a thickness direction at a connection position between the body connection portion and the extension portion; bending the extensions toward or away from the cell body at connection positions between the extensions and the high and low voltage connection portions to cause the high and low voltage connection portions to protrude from the cell body; A method for bending an electrode tab of a pouch-type cell, comprising:

4. When the included angle between the main body connection portion and the extension portion is α and the included angle between the extension portion and the high and low voltage connection portion is β, α and β are expressed as follows: 60°≦α≦120°, and / or ６０°≦ β ≦１２０° 4. The method for bending an electrode tab of a pouch-type battery cell according to claim 3, wherein the above conditions are satisfied.

5. When the bending radius between the main body connection portion and the extension portion is R1, the bending radius between the extension portion and the high and low voltage connection portion is R2, and the thickness of the electrode tab is D1, R1 and R2 are 0.5D1≦R1≦25D1, and / or 0.5D1≦R2≦25D1 5. The method for folding an electrode tab of a pouch-type battery cell according to claim 3 or 4, which satisfies the above condition.

6. A battery pack including a cell stack formed by connecting a plurality of cell groups in series, the cell groups including some of the pouch-type cells according to any one of claims 1 to 2, and some of the pouch-type cells being stacked and electrically connected along their thickness direction.

7. 7. The battery pack according to claim 6, wherein in one cell group, all electrode tabs located on the same side of some of the pouch-type battery cells are stacked to form a single electrode tab structure, the body connection portion of the electrode tab forms the body connection structure of the electrode tab structure, the extension portion of the electrode tab forms the extension structure of the electrode tab structure, the high and low voltage connection portion of the electrode tab forms the high and low voltage connection structure of the electrode tab structure, and the body connection structure and the extension structure are arranged to be bent to form an included angle, and the extension structure and the high and low voltage connection structure are arranged to be bent to form an included angle.

8. The battery pack according to claim 7 , wherein the high and low voltage connection structures extend in a direction toward the cell body, or the high and low voltage connection structures extend in a direction away from the cell body.

9. 9. The battery pack according to claim 8, wherein, of two adjacent cell groups, two of the electrode tab structures at one end of the two cell groups are at least partially overlapping and electrically connected, or two of the electrode tab structures at one end of the two cell groups are indirectly electrically connected.

10. 10. The battery pack according to claim 9, wherein the battery pack further includes an insulating support, the insulating support including a first support portion, the first support portion being not lower than an upper surface of the cell stack in a height direction, and the high and low voltage connection structures of the electrode tab structure being supported by being positionally restricted by the first support portion.

11. 11. The battery pack of claim 10, wherein the battery pack further includes a sampling assembly, the sampling assembly including a voltage sampling member and a temperature sampling member, the voltage sampling member being connected to the high and low voltage connection structure, and the temperature sampling member being disposed on an upper surface in the height direction of the cell stack.

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