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 in particular, to a pouch-type battery cell, a method for bending an electrode tab of a pouch-type battery cell, and a battery pack.

Background Art

[0002] The pouch-type battery cell is an important component of a power battery and also a major development direction. A general power battery includes a housing and a cell stack. The cell stack is installed inside the housing and is formed by stacking a plurality of pouch-type battery cells. In the conventional technology, in order to sample the temperature and voltage inside the power battery, usually, insulating supports are installed at both ends in the length direction of the cell stack, a current collector plate is fixed on the insulating support, and then the electrode tabs of the cell stack are extended and bent from both ends in its length direction and fixed to the current collector plate on the insulating support to achieve electrical connection with the current collector plate. Finally, the sampled components are electrically connected to the current collector plate to complete the sampling arrangement of the power battery.

[0003] However, the conventional sampling arrangement method has the following disadvantages. 1) Since the welding of the electrode tab of the cell stack and the current collector plate is located at the end face in the length direction of the cell stack, the welding operation is inconvenient. 2) Since the sampling arrangement is at the end face in the length direction of the cell stack, the difficulty of the arrangement and the length of the sampling wire increase, wasting space. 3) It is necessary to arrange an insulating support at the end face in the length direction of the cell stack, and due to the limitation of the welding direction of the electrode tab, it is necessary to ensure excessive space at the end face in the length direction of the cell stack, resulting in a decrease in 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

Problems to be Solved by the Invention

[0005] One objective of the present invention is to provide a pouch-type battery cell that facilitates subsequent electrode tab welding and sampling arrangement, and improves the space utilization rate of the battery pack.

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

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

[0008] To achieve the above objectives, we provide the following technical solutions.

[0009] In a first embodiment, a pouch-type battery cell is provided, the pouch-type battery cell comprising 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 comprising a body connection portion, an extension portion, and a high / low voltage connection portion connected in order, the body connection portion being connected to the cell body and extending along the longitudinal direction of the cell body, the extension portion extending along the height direction of the cell body, the high / low voltage connection portion being connected to the upper end of the extension portion and protruding upward from the cell body, and the electrode tabs being bendable at the connection point between the body connection portion and the extension portion and at the connection point between the extension portion and the high / low voltage connection portion.

[0010] As a selectable configuration for the pouch-type battery cell, if the thickness of the electrode tab is D1, the length of the main 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 / low voltage connection portion in the height direction of the cell 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 / low voltage connection portion is W3, then D1, L1, L2, L3, W1, W2, and W3 satisfy the conditions 0.1 mm ≤ D1 ≤ 1 mm and / or 0.5 ≤ (L2 + L3 - L1) / L1 ≤ 5 and / or 0.2 ≤ W3 / (W1 + W2) ≤ 1.

[0011] As a second embodiment, a method for bending electrode tabs of a pouch-type battery cell is provided, wherein the pouch-type battery cell includes a cell body and electrode tabs, the electrode tabs including a body connection portion, an extended portion, and a high / low voltage connection portion connected in order, and the method for bending electrode tabs of the pouch-type battery cell includes the steps of: bending the extension portion along the thickness direction of the cell body at the connection position between the body connection portion and the extended portion; and bending the extension portion at the connection position between the extended portion and the high / low voltage connection portion in a direction toward or away from the cell stack to make the high / low voltage connection portion protrude from the cell body.

[0012] As a selectable method for bending the electrode tab of the pouch-type battery cell, if the angle between the main body connection portion and the extended portion is α, the angle between the extended portion and the high / low voltage connection portion is β, the bending radius between the main body connection portion and the extended portion is R1, the bending radius between the extended portion and the high / low voltage connection portion is R2, and the thickness of the electrode tab is D1, then 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 embodiment, the present invention provides a battery pack comprising a cell stack formed by connecting a plurality of cell groups in series, wherein each cell group includes several of the aforementioned pouch-type battery cells, and several of the pouch-type battery cells are stacked along their thickness direction and electrically connected.

[0014] As a selectable configuration for the battery pack, in one cell group, all electrode tabs located on the same side of several pouch-type battery cells are stacked to form a single electrode tab structure, the body connection portion of the electrode tab forms a body connection structure of the electrode tab structure, the extension portion of the electrode tab forms an extension structure of the electrode tab structure, the high / low voltage connection portion of the electrode tab forms a high / low voltage connection structure of the electrode tab structure, and the body connection structure and the extension structure are bent to form an angle, and the extension structure and the high / low voltage connection structure are bent to form an angle.

[0015] As a selectable configuration for the battery pack, the high / low voltage connection structure extends toward the cell body, or extends toward the cell body.

[0016] As a selectable configuration for the battery pack, in two adjacent cell groups, the two electrode tab structures at one end of the two cell groups are electrically connected in at least partial overlap. Alternatively, the two electrode tab structures at one end of the two cell groups are electrically connected indirectly.

[0017] As a selectable configuration 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 in the height direction of the cell stack, and the high and low voltage connection structure of the electrode tab structure is supported with its position restricted to the first support portion.

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

[0019] Compared to conventional technologies, 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 electrode tabs, the electrode tabs including a body connection portion, an extension portion, and a high / low voltage connection portion connected in order, the body connection portion being connected to the cell body and extending along the length of the cell body, the extension portion extending along the height of the cell body, the high / low voltage connection portion being connected to the upper end of the extension portion and protruding upward from the cell body, and the electrode tabs being bendable at the connection point between the body connection portion and the extension portion and the connection point between the extension portion and the high / low voltage connection portion. With this configuration, the high / low voltage connection portion of the electrode tab of the pouch-type battery cell can be bent upward in the height direction of the pouch-type battery cell, thereby facilitating subsequent electrode tab welding and sampling arrangement. Compared to conventional techniques in which electrode tab welding and sampling arrangement are performed at both ends in the length direction of the cell stack, the solution provided by the present invention can improve the convenience and efficiency of subsequent electrode tab welding and sampling arrangement, and at the same time, it is not necessary to secure excess space in the length direction of the battery pack, thereby improving the space utilization rate and energy density of the battery pack.

[0021] The method for bending electrode tabs of a pouch-type battery cell provided by the present invention facilitates subsequent electrode tab welding and sampling arrangement, improves the space utilization rate of the battery pack, and increases the energy density of the battery pack.

[0022] The battery pack provided by the present invention can facilitate the electrical connection and sampling arrangement of electrode tabs between a plurality of pouch-type battery cells in the battery pack and further improve the space utilization rate and energy density of the battery pack by applying the above-described pouch-type battery cell.

Brief Description of the Drawings

[0023] To more clearly explain the technical solutions in the embodiments of the present invention, the drawings necessary for the description of the embodiments of the present invention will be briefly introduced below. 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 creative efforts.

[0024] [Figure 1] It is a schematic structural diagram of a pouch-type battery cell provided by an embodiment of the present invention. [Figure 2] It is a schematic structural diagram of an electrode tab provided by an embodiment of the present invention. [Figure 3] It is a flowchart of a method for folding an electrode tab of a pouch-type battery cell provided by an embodiment of the present invention. [Figure 4] It is a schematic structural diagram of the first folding state of a pouch-type battery cell provided by an embodiment of the present invention. [Figure 5] It is a schematic structural diagram of the electrode tab in FIG. 4. [Figure 6] It is a schematic structural diagram of the second folding state of a pouch-type battery cell provided by an embodiment of the present invention. [Figure 7] It is a schematic structural diagram of the electrode tab in FIG. 6. [Figure 8] It is an exploded view of the first battery pack provided by an embodiment of the present invention. [Figure 9] It is an enlarged view of part A of FIG. 8. [Figure 10] It is a schematic structural diagram of the second battery pack provided by an embodiment of the present invention. [Figure 11] It is an enlarged view of part B of FIG. 10. [Figure 12] This is a plan view of a second battery pack provided by an embodiment of the present invention. [Figure 13] This is a schematic diagram of the structure of a third battery pack provided by an embodiment of the present invention. [Figure 14] This is an enlarged view of section C in Figure 13. [Modes for carrying out the invention]

[0025] To further clarify the technical problems solved by this invention, the technical solutions employed, and the technical effects achieved, the technical solutions of this invention will be further described below with reference to specific embodiments, in conjunction with the drawings.

[0026] In describing the present invention, unless explicitly stated or limited, the terms “to connect,” “to connect,” and “to fix” should be interpreted broadly, for example, whether the connection is fixed or removable, integrally molded, mechanical or electrical, direct or indirect through an intermediate mediator, or an internal connection or interaction relationship between two components. Those skilled in the art will be able to understand the specific meaning of the above terms in the present invention depending on the specific context.

[0027] In the present invention, unless otherwise explicitly stated or limited, the expression that the first feature is "above" or "below" the second feature may include cases where the first and second features are in direct contact, or may include cases where the first and second features are not in direct contact but are in contact through another feature between them. Furthermore, the expression that the first feature is "above," "above," and "on the top surface" of the second feature may include cases where the first feature is directly above and diagonally above the second feature, or simply indicates that the horizontal height of the first feature is greater than that of the second feature. The expression that the first feature is "below," "below," and "on the bottom surface" of the second feature may include cases where the first feature is directly below and diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than that of the second feature.

[0028] In the description of this invention, terms indicating directions and positional relationships such as "up," "down," "left," and "right" are based on the directions and positional relationships shown in the drawings and are merely for the purpose of simplifying the explanation and operation. They do not indicate or suggest that the specified device or component has a specific direction or must be configured and operated in a specific direction, and therefore should not be understood as limitations to this invention. Furthermore, terms such as "first" and "second" are used simply to distinguish between sections of the explanation 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, the two electrode tabs 12 being symmetrically connected to both ends of the cell body 11 in the longitudinal direction. The two electrode tabs 12 are the positive electrode tab and the negative electrode tab, respectively.

[0030] It should be explained that in this 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 for both is the same. Therefore, for ease of understanding, the electrode tab 12 mentioned below may be either a positive electrode tab or a negative electrode tab, and the positive electrode tab and the negative electrode tab may adopt the same shape and structure, or different shapes and structures may be selected under the overall same inventive concept, but examples will not be given one by one here.

[0031] Figure 2 shows a schematic diagram of the structure of the electrode tab 12 provided by the present invention. As shown in combination with Figure 1, the electrode tab 12 includes a main body connection portion 121, an extension portion 122, and a high / low voltage connection portion 123 connected in order. The main 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 / 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 point between the main body connection portion 121 and the extension portion 122, and at the connection point between the extension portion 122 and the high / low voltage connection portion 123. This configuration allows the high and low voltage connection portion 123 of the electrode tab 12 of the pouch-type battery cell 10 to be bent upwards in the height direction of the pouch-type battery cell 10, thereby facilitating the welding and sampling of subsequent electrode tabs 12. Compared to conventional techniques in which the welding and sampling of electrode tabs 12 are performed at both ends in the length direction of the cell stack 2, the solution provided by the present invention can improve the convenience and efficiency of the welding and sampling of subsequent electrode tabs 12, and at the same time, it is not necessary to secure excess 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 Figure 2, let D1 be the thickness of the electrode tab 12, L1 be the length of the main body connection part 121 in the height direction of the cell body 11, L2 be the length of the extension part 122 in the height direction of the cell body 11, L3 be the length of the high / low voltage connection part 123 in the height direction of the cell body 11, W1 be the width of the main body connection part 121, W2 be the width of the extension part 122, and W3 be the width of the high / low voltage connection part 123. Selectively, the range of the value of the thickness D1 of the electrode tab 12 is 0.1 mm ≤ D1 ≤ 1 mm. With this setting, the overall structural strength of the electrode tab 12 can be ensured, and at the same time, the bending of the electrode tab 12 can be facilitated. Selectively, L1, L2, and L3 satisfy 0.5 ≤ L2 + L3 - L1 / L1 ≤ 5. With this setting, the overall structural strength of the electrode tab 12 can be ensured, and at the same time, the bending of the electrode tab 12 can be facilitated. Selectively, W1, W2, and W3 satisfy 0.2 ≤ W3 / W1 + W2 ≤ 1 and / or W1 ≤ W2. For example, the width W2 of the extension 122 is equal to the width W3 of the high / low voltage connection 123. Naturally, in other embodiments, the width W3 of the high / low voltage connection 123 may be greater than the width W2 of the extension 122, but these can be specifically designed as needed, so we will not explain each example here.

[0033] Figure 3 shows a flowchart of the electrode tab bending method for a pouch-type battery cell provided by the present invention. As shown in Figure 3, the electrode tab bending method for the pouch-type battery cell includes the following: In S100, the extension portion 122 is bent in the thickness direction of the cell body 11 at the connection point between the main body connection portion 121 and the extension portion 122, thereby extending the extension portion 122 along the thickness direction of the cell body 11. In S200, the extension portion 123 is bent in a direction toward or away from the cell body 11 at the connection point between the extension portion 122 and the high / low voltage connection portion 123, causing the high / low voltage connection portion 123 to protrude from the cell body 11. This electrode tab bending method facilitates subsequent electrode tab welding and sampling arrangement, improves the space utilization rate of the battery pack, and increases the energy density of the battery pack.

[0034] Figure 4 shows a schematic diagram of the structure of the pouch-type battery cell 10 provided by the present invention in its first folded state. Figure 5 shows a schematic diagram of the structure of the electrode tab 12 in Figure 4. As shown in Figures 4 and 5, the electrode tab 12 is folded in the thickness direction of the cell body 11 at the connection point between the main body connection portion 121 and the extended portion 122, positioning the extended portion 122 and the high / low voltage connection portion 123 at the ends in the length direction of the cell body 11. Subsequently, the electrode tab 12 is folded in a direction toward the cell body 11 at the connection point between the extended portion 122 and the high / low voltage connection portion 123, folding the high / low voltage connection portion 123 upwards in the height direction of the cell body 11. The high / low voltage connection portion 123 is used for welding between the electrode tabs 12 of the pouch-type battery cell 10 and for sampling placement.

[0035] Figure 6 shows a schematic diagram of the second folded state of the pouch-type battery cell 10 provided by the present invention. Figure 7 shows a schematic diagram of the structure of the electrode tab 12 in Figure 6. As shown in Figures 6 and 7, the electrode tab 12 is folded in the thickness direction of the cell body 11 at the connection point between the main body connection part 121 and the extended part 122, positioning the extended part 122 and the high / low voltage connection part 123 at the longitudinal end of the cell body 11. Subsequently, the electrode tab 12 is folded away from the cell body 11 at the connection point between the extended part 122 and the high / low voltage connection part 123, folding the high / low voltage connection part 123 upwards in the height direction of the cell body 11. The high / low voltage connection part 123 is used for welding between the electrode tabs 12 of the pouch-type battery cell 10 and for sampling placement.

[0036] It should be explained that both of the two methods for bending the electrode tabs 12 described above can be applied to the cell stack 2, but the specific method to adopt can be selected based on the specific assembly scene and requirements, so it will not be explained in detail here. Regardless of whether the high / low voltage connection part 123 is bent toward the cell body 11 or toward the cell body 11, the bending conditions of the electrode tab 12 satisfy the following requirements. If the angle between the main body connection part 121 and the extension part 122 is α, then α satisfies 60° ≤ α ≤ 120°. The specific bending angle between the main body connection part 121 and the extension part 122 can be bent according to the actual assembly requirements, so it is not limited here. If the angle between the extension part 122 and the high / low voltage connection part 123 is β, then β satisfies 60° ≤ β ≤ 120°. The specific bending angle between the extension portion 122 and the high / low voltage connection portion 123 is not limited here, as it can be bent according to the actual assembly requirements. If the bending radius between the main body connection portion 121 and the extension portion 122 is R1, then the relationship between R1 and the thickness D1 of the electrode tab 12 satisfies 0.5D1 ≤ R1 ≤ 25D1. This setting facilitates bending between the main body connection portion 121 and the extension portion 122, while simultaneously ensuring the structural strength of the bent portion. If the bending radius between the extension portion 122 and the high / low voltage connection portion 123 is R2, then 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 / low voltage connection portion 123, while simultaneously ensuring the structural strength of the bent portion.

[0037] Figure 8 shows an exploded view of a first battery pack provided by the present invention. As shown in Figure 8, the battery pack includes a cell stack 2, a first side plate 3, a second side plate 4, an insulating support 5, and a frame 6. 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. The first side plate 3, the second side plate 4, the two insulating supports 5, and the cell stack 2 constitute a battery cell assembly, and the entire battery cell assembly is housed within the frame 6. For example, the battery pack further includes a top cover and a bottom plate, 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, and each cell group includes several of the aforementioned pouch-type battery cells 10, and within one cell group, several pouch-type battery cells 10 are stacked and electrically connected, but may be in parallel or in series. The high / low voltage connection structure 213 extends toward the cell body 11. Alternatively, the high / low voltage connection structure 213 extends toward the cell body 11.

[0038] The explanation will be given as an example where pouch-type battery cells 10 within a cell group are connected in parallel. Figure 9 is an enlarged view of part A in Figure 8. As shown by combining Figure 9 and Figure 8, in one cell group, when 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 main connection portion 121 of the electrode tab 12 forms the main connection structure 211 of the electrode tab structure 21, the extension portion 122 of the electrode tab 12 forms the extension structure 212 of the electrode tab structure 21, and the high / low voltage connection portion 123 of the electrode tab 12 forms the high / 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 an electrode tab structure 21. For example, multiple positive electrode tabs are stacked to form a positive electrode tab structure, multiple negative electrode tabs are stacked to form a negative electrode tab structure, and the positive electrode tab structures and negative electrode tab structures between multiple cell groups are connected in series to form a cell stack 2. Selectively, the main body connection structure 211 and the extension structure 212 are bent to form an angle, and the angle range between the main body connection structure 211 and the extension structure 212 is 60° ≤ α ≤ 120°. The extension structure 212 and the high / low voltage connection structure 213 are bent to form an angle, and the angle range between the extension structure 212 and the high / low voltage connection structure 213 is 60° ≤ β ≤ 120°.

[0039] Continuing to refer to Figure 9, the positive electrode tab structure of one cell group and the negative electrode tab structure of an adjacent cell group are stacked relative to each other. That is, the stretched structure 212 of the positive electrode tab structure and the stretched structure 212 of the negative electrode tab structure are stacked and at least partially overlap, and the high / low voltage connection structure 213 of the positive electrode tab structure and the high / low voltage connection structure 213 of the negative electrode tab structure are stacked and at least partially overlap. In other words, the electrode tab structures 21 between cell groups shown in Figure 8 are directly electrically connected, and there is no need to electrically connect the electrode tab structures 21 via the current collector plate 8, thus saving the current collector plate 8 component, reducing the number of steps in the manufacturing process, as well as reducing material costs and improving manufacturing efficiency. Furthermore, since the high / low voltage connection structure 213 is stretched 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 at the same time improves the heat dissipation efficiency of the electrode tab structure 21.

[0040] As shown in combination with Figures 9 and 8, the battery pack further includes an insulating support 5, which includes a first support portion 51, the first support portion 51 not lower than the upper surface in the height direction of the cell stack 2, and the high / low voltage connection structure 213 of the electrode tab structure 21 is supported by the first support portion 51, which is positioned to be limited to the first support portion 51. With this configuration, the high / low voltage connection structure 213 can be bent and placed on the first support portion 51 of the insulating support 5, thereby serving to support the high / low voltage connection structure 213, and at the same time facilitating subsequent sampling arrangement, and since sampling arrangement can be performed directly on the upper surface in the height direction of the cell stack 2, there is no need to secure excess space in the length direction of the frame 6, improving the space utilization rate of the battery pack and increasing the energy density of the battery pack.

[0041] As shown in combination with Figures 9 and 8, the insulating support 5 further includes a second support portion 52, which is located at the longitudinal end of the cell stack 2 and abuts against the longitudinal end face of the cell stack 2. The first support portion 51 and the second support portion 52 can be installed vertically, with the first support portion 51 extending away from the cell stack 2 and used to support the high and low voltage connection structure 213 of the electrode tab structure 21. Furthermore, a relief groove 521 is provided on the second support portion 52, and the electrode tab structure 21 of the cell stack 2 is installed opposite the relief groove 521, so that the second support portion 52 does not press against the electrode tab structure 21 after assembly.

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

[0043] As shown in combination with 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 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 fix the insulating support 5 between the first side plate 3 and the second side plate 4, and the cell laminate 2 is located in 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 molded by injection molding using insulating plastic.

[0045] Figure 10 is a schematic diagram of the structure of a second battery pack provided by an embodiment of the present invention. Figure 11 is an enlarged view of portion B of Figure 10. As shown in Figures 10 to 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, and 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 a plurality of cell groups in series, and each cell group includes several of the aforementioned pouch-type battery cells 10, and within one cell group, several pouch-type battery cells 10 are stacked along their thickness direction and connected in parallel. In one cell group, all 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 main body connection portion 121 of the electrode tab 12 forms the main body connection structure 211 of the electrode tab structure 21, the extension portion 122 of the electrode tab 12 forms the extension structure 212 of the electrode tab structure 21, and the high / low voltage connection portion 123 of the electrode tab 12 forms the high / 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 bending direction of the high / low voltage connection structure 213 of the electrode tab structure 21 is different. In the second battery pack, the high / low voltage connection structure 213 is bent toward the cell stack 2, while in the first battery pack, the high / low voltage connection structure 213 is bent away from the cell stack 2.

[0047] Furthermore, in order to accommodate the difference in the bending method of the high and low voltage connection structure 213 described above, the structure of the insulating support 5 of the second battery pack is also different from the structure of the insulating support 5 of the first battery pack. Referring to Figure 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 in the height direction of the cell stack 2, and the second support portion 52 extends almost perpendicularly to the first support portion 51 to the end face portion in the length direction of the cell stack 2 and is used to restrict and support the position in the length direction of the cell stack 2. In addition, the second support portion 52 is provided with a relief groove 521 so that the electrode tab structure 21 can pass through, and after the electrode tab structure 21 passes through the relief groove 521, the high and low voltage connection structure 213 is bent toward the direction of the cell stack 2 and is supported by the first support portion 51 in a position restricted. The sealing portion 53 is connected to one end of the first support portion 51 away from the second support portion 52, and the sealing portion 53 protrudes from the first support portion 51 in a direction away from the cell laminate 2, and the sealing portion 53 is used to prevent the sealing resin from flowing out into the cell laminate 2. The first support portion 51 is provided with fixing portions 54 at both ends in the thickness direction of the cell laminate 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] Figure 12 is a plan view of a second battery pack provided by an embodiment of the present invention. As shown in Figure 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 being connected to a high / low voltage connection structure 213, and the temperature sampling member 71 being positioned on the upper surface of the cell stack 2 in the height direction. By positioning the sampling assembly 7 above the cell stack 2, the height direction space of the battery pack can be fully utilized, making sampling arrangement easier and eliminating the need to secure excessive mounting operation space in the length direction of the battery pack frame 6, thereby improving the space utilization rate of the battery pack and increasing the energy density. For example, there are four temperature sampling members 71, which are spaced apart on the upper surface of the cell stack 2 in the height direction, and one voltage sampling member 72 is connected to two connected electrode tab structures 21. Naturally, in other embodiments, the number and arrangement positions of the temperature sampling members 71 may be in other forms, and the number and arrangement method of the voltage sampling members 72 may also be in other forms, but since we are not limited to the examples described above, we will not explain each one individually here.

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

[0050] Figure 13 is a schematic diagram of the structure of a third battery pack provided by an embodiment of the present invention. Figure 14 is an enlarged view of portion C in Figure 13. As shown in Figures 13 to 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, with the cell stack 2 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 a plurality of cell groups in series, each cell group containing several of the aforementioned pouch-type battery cells 10, and within one cell group, several pouch-type battery cells 10 are stacked along their thickness direction and connected in parallel. In one cell group, all 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 main body connection portion 121 of the electrode tab 12 forms the main body connection structure 211 of the electrode tab structure 21, the extension portion 122 of the electrode tab 12 forms the extension structure 212 of the electrode tab structure 21, and the high / low voltage connection portion 123 of the electrode tab 12 forms the high / 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 the main differences are as follows: In the third cell stack 2, the electrode tab structure 21 of the cell group is electrically connected via the current collector plate 8, whereas in the second cell stack 2, the electrode tab structure 21 of the cell group is electrically connected by directly overlapping in part. Similarly, the electrode tab structure 21 of the cell group in the first cell stack 2 is also electrically connected by directly overlapping in part.

[0052] Furthermore, in order to accommodate the differences in the connection methods 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 Figure 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 in the height direction of the cell stack 2, and the second support portion 52 extends almost perpendicularly to the first support portion 51 to the end face portion in the length direction of the cell stack 2, and is used to restrict and support the position in the length direction of the cell stack 2. In addition, the second support portion 52 is provided with two relief grooves 521, allowing the electrode tab structures 21 of two adjacent cell groups to pass through each of them, and after the electrode tab structures 21 pass through the relief grooves 521, the high and low voltage connection structure 213 is bent toward the direction of the cell stack 2 and is supported in a position restricted by the current collector plate 8 of the first support portion 51. The sealing portion 53 is connected to one end of the first support portion 51 away from the second support portion 52, and the sealing portion 53 protrudes from the first support portion 51 in a direction away from the cell laminate 2, and the sealing portion 53 is used to prevent the sealing resin from flowing out into the cell laminate 2. The first support portion 51 is provided with fixing portions 54 at both ends in the thickness direction of the cell laminate 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 battery pack described above. By applying the battery pack described above, the operating time of the electronic device is extended. The electronic device of the present invention can be used not only in backup power supplies, motors, automobiles, large household storage batteries, energy storage, etc.

[0054] It should be noted that, in this specification, reference terms such as “several embodiments” and “other embodiments” mean that the specific features, structures, materials, or properties described in combination with those embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or properties described may be combined in an appropriate manner in any one or more embodiments or examples.

[0055] The foregoing describes only more preferred embodiments and applied technical principles of the present invention. As will be understandable to those skilled in the art, the present invention is not limited to the specific embodiments described herein, and various obvious modifications, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Thus, although the present invention has been described in more detail by the embodiments described above, the present invention is not limited to the embodiments described herein, and many other equivalent embodiments can be included without departing from the concept of the present invention. The scope of the present invention shall be defined by the appended claims. [Explanation of Symbols]

[0056] 10 pouch-type battery cells 11 Cell body 12 Electrode Tabs 121 Main unit connection part 122 Stretching section 123 High and Low Voltage Connection Section 2-cell laminate 21 Electrode tab structure 211 Main unit 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 Escape ditch 53 Sealing part 54 Fixed part 6 frames 7. Sampling Assembly 71 Temperature sampling member 72 Voltage sampling component 73 Electric wire 8 Current collector plate

Claims

1. The cell body and Electrode tabs and The electrode tabs are connected symmetrically to both ends of the cell body in the longitudinal direction, and the electrode tabs include, in order, a body connection portion, an extension portion, and a high / low voltage connection portion, 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 / low voltage connection portion is connected to the upper end of the extension portion and protrudes upward from the cell body, and the electrode tabs can be bent at the connection point between the body connection portion and the extension portion and at the connection point between the extension portion and the high / low voltage connection portion. If the thickness of the electrode tab is D1, the length of the main 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 / low voltage connection portion in the height direction of the cell 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 / low voltage connection portion is W3, then D1, L 1, 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 A pouch-type cell that meets the following conditions.

2. A pouch-type battery cell comprises a cell body and an electrode tab, the electrode tab comprising, in order, a body connection portion, an extension portion, and a high / low voltage connection portion, the body connection portion being connected to the cell body and extending along the length of the cell body, the extension portion extending along the height of the cell body, and the high / low voltage connection portion being connected to the upper end of the extension portion and protruding upward from the cell body, and a method for bending the electrode tab of the pouch-type battery cell, The step of bending the cell body in the thickness direction at the connection point between the main body connection portion and the extension portion, The steps include: bending the extended portion at the connection point between the extended portion and the high / low voltage connection portion in a direction toward or away from the cell body, thereby causing the high / low voltage connection portion to protrude from the cell body; Includes, If the thickness of the electrode tab is D1, the length of the main 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 / low voltage connection portion in the height direction of the cell 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 / 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 A method for bending the electrode tabs of a pouch-type cell that satisfies the following conditions.

3. If the angle between the main body connection portion and the extension portion is α, and the angle between the extension portion and the high / low voltage connection portion is β, then α and β are 60° ≤ α ≤ 120°, and / or ６０°≦ β ≦１２０° A method for bending the electrode tab of a pouch-type battery cell according to claim 2, which satisfies the conditions.

4. If R1 is the bending radius between the main body connection portion and the extension portion, R2 is the bending radius between the extension portion and the high / low voltage connection portion, and D1 is the thickness of the electrode tab, then R1 and R2 are, 0.5D1 ≤ R1 ≤ 25D1, and / or 0.5D1 ≤ R2 ≤ 25D1 A method for bending the electrode tabs of a pouch-type battery cell according to claim 2 or 3, which satisfies the conditions.

5. A battery pack comprising a cell stack formed by connecting a plurality of cell groups in series, wherein the cell groups include several pouch-type cells as described in claim 1, and several of the pouch-type cells are stacked along their thickness direction and electrically connected.

6. The battery pack according to claim 5, wherein in one cell group, all electrode tabs located on the same side of several pouch-type battery cells are stacked to form a single electrode tab structure, the main body connection portion of the electrode tab forms a main body connection structure of the electrode tab structure, the extended portion of the electrode tab forms an extended structure of the electrode tab structure, the high / low voltage connection portion of the electrode tab forms a high / low voltage connection structure of the electrode tab structure, and the main body connection structure and the extended structure are bent to form an angle, and the extended structure and the high / low voltage connection structure are bent to form an angle.

7. The battery pack according to claim 6, wherein the high / low voltage connection structure extends toward the cell body, or the high / low voltage connection structure extends toward the cell body.

8. The battery pack according to claim 7, wherein, of two adjacent cell groups, two electrode tab structures at one end of the two cell groups are electrically connected in at least partially overlapping manner, or two electrode tab structures at one end of the two cell groups are indirectly electrically connected.

9. The battery pack according to claim 8, wherein 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 in the height direction of the cell stack, and the high / low voltage connection structure of the electrode tab structure is supported with its position restricted to the first support portion.

10. The battery pack according to claim 9, wherein the battery pack further includes a sampling assembly, the sampling assembly includes a voltage sampling member and a temperature sampling member, the voltage sampling member is connected to the high / low voltage connection structure, and the temperature sampling member is positioned on the upper surface in the height direction of the cell stack.

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