Battery cell structure, preparation method of battery cell, and battery module

Abstract

This invention provides a battery cell structure, a method for manufacturing the battery cell, and a battery module. The battery cell structure includes a large cell surface and a top cover. The structure comprises: multiple coils, each coil having a positive electrode tab and a negative electrode tab at both ends in a first direction, and the multiple coils arranged adjacent to each other along a second direction perpendicular to the first direction; and at least one L-shaped adapter piece, the L-shaped adapter piece having a first side extending along the first direction and a second side extending along the second direction. The first side is connected to the top cover, and the second side is connected to the positive or negative electrode tabs of the multiple coils and then attached to the large cell surface to form a protrusion on the large cell surface, thereby forming a groove on the large cell surface in the area outside the protrusion. The parallel arrangement of the coils in the battery cell structure of this invention enables capacity expansion in the length direction, resulting in a long and thin battery cell shape, significantly increasing the heat dissipation area.

Description

Technical Field

[0001] This invention relates primarily to the field of batteries, and more particularly to a cell structure, a cell preparation method, and a battery module. Background Technology

[0002] With the rapid development of vehicle electrification and new energy storage, the market demands increasingly higher energy density, cycle life, and battery cost for power batteries and energy storage batteries. Current research mainly focuses on assembling more battery cells within a limited module space, minimizing auxiliary components during module assembly, and enhancing internal heat dissipation to achieve higher energy density, longer cycle life, and lower cost.

[0003] Patent CN202010022452.5 discloses a battery. This battery primarily utilizes multiple core groups connected in series internally to increase the cell voltage and thus improve the overall energy of the cell. However, the cores in each independent chamber still increase capacity by stacking and connecting them in parallel along the thickness direction, resulting in poor overall heat dissipation. Furthermore, this internal series structure requires isolating the electrolyte in each independent chamber, introducing complex structural connectors and increasing manufacturing costs and complexity. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a cell structure, a cell preparation method and a battery module, so as to solve the problem of poor heat dissipation caused by the stacking and expansion of cells in the thickness direction.

[0005] To solve the above-mentioned technical problems, the present invention provides a battery cell structure having a large surface and a top cover. The battery cell structure includes: a plurality of coils, each coil having a positive electrode tab and a negative electrode tab at both ends in a first direction, and the plurality of coils being arranged adjacent to each other in a second direction perpendicular to the first direction; and at least one L-shaped adapter piece, the L-shaped adapter piece having a first side extending in the first direction and a second side extending in the second direction, wherein the first side is connected to the top cover, and the second side is connected to the positive or negative electrode tabs of the plurality of coils and then attached to the large surface of the battery cell to form a protrusion on the large surface of the battery cell, thereby forming a groove on the large surface of the battery cell in the area outside the protrusion.

[0006] In some embodiments of the present invention, the protrusion is formed from the second side and rotated 180 degrees after being connected to the positive electrode tab or the negative electrode tab.

[0007] In some embodiments of the present invention, an insulating material is attached to the outer surface of the second side.

[0008] In some embodiments of the invention, a core connector is also included, the core connector having a plurality of core positions adapted to hold the plurality of cores.

[0009] In some embodiments of the present invention, a cover plate, a housing, and a bottom cover plate are also included, wherein the cover plate covers the large surface of the battery cell, the housing supports the battery cell structure from the other side of the large surface of the battery cell, and the bottom cover plate is located on the opposite side to the top cover of the battery cell. The top cover of the battery cell, the cover plate, the housing, and the bottom cover plate form a sealed space for sealing the plurality of wound cores.

[0010] In some embodiments of the invention, the housing has a protrusion adapted to partially surround the protrusion.

[0011] To solve the above-mentioned technical problems, the present invention provides a battery module, including an aluminum busbar, a fan, a BMS board, and multiple battery cells. The multiple battery cells have the battery cell structure described above, wherein the BMS board, the aluminum busbar, and the fan are located sequentially on one side of the top cover of the multiple battery cells.

[0012] In some embodiments of the present invention, a module base plate and a binding strap are also included, wherein the plurality of battery cells are placed on the module base plate and fixed by the binding strap.

[0013] In some embodiments of the present invention, in the plurality of battery cells, at least two battery cells constitute a battery cell unit, and the number of aluminum busbars and fans is plurality of, wherein the battery cells in each battery cell unit are fixed by at least one strap, and each battery cell unit corresponds to a set of aluminum busbars and fans.

[0014] To solve the above-mentioned technical problems, the present invention provides a method for preparing a battery cell, suitable for preparing a battery cell structure having a large surface area and a top cover. The preparation method includes the following steps: providing a plurality of cores, each core having a positive electrode tab and a negative electrode tab at both ends in a first direction, and the plurality of cores being arranged adjacent to each other in a second direction perpendicular to the first direction; providing an L-shaped adapter piece, the L-shaped adapter piece having a first side extending along the first direction and a second side extending along the second direction; connecting the second side of the L-shaped adapter piece to the positive electrode tab or negative electrode tab of the plurality of cores; folding the connected L-shaped adapter piece and the plurality of positive electrode tabs or the plurality of negative electrode tabs by 180 degrees, so that the second side of the L-shaped adapter piece is attached to the large surface area of ​​the battery cell to form a protrusion, and the area outside the protrusion forms a groove on the large surface area of ​​the battery cell; and connecting the first side of the L-shaped adapter piece to the top cover of the battery cell.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The parallel arrangement of the coiled cores in the cell structure of this invention can achieve capacity expansion in the length direction, and the cell shape has the characteristics of being long and thin, which greatly increases the heat dissipation area; the L-shaped current guiding structure greatly increases the welding width of the tabs, improves the current carrying capacity of the coiled cores, and reduces the cell impedance; the battery module of this invention uses the tab welding and the folding of the adapter plate to form a protrusion on the large surface to assist in the formation of air ducts in the module design. This design of the cell shape self-assembling to form an air duct structure can save auxiliary components for air duct design in the module and help reduce costs. Attached Figure Description

[0017] The accompanying drawings are included to provide a further understanding of this application and form part of this application. The drawings illustrate embodiments of the present application and, together with this specification, serve to explain the principles of the invention. In the drawings:

[0018] Figure 1 This is an exploded view of a battery cell structure according to an embodiment of the present invention;

[0019] Figure 2A This is a schematic diagram of the structure of the core 10 according to an embodiment of the present invention;

[0020] Figure 2B yes Figure 1 A schematic diagram of the welding structure between the L-shaped adapter piece and the electrode lug of the winding core;

[0021] Figure 3 This is a three-dimensional schematic diagram of a battery cell structure according to an embodiment of the present invention;

[0022] Figure 4 This is an exploded view of a battery module according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the self-assembly air duct structure of a battery module according to an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 A magnified view of part I in the middle;

[0025] Figure 7 This is a schematic diagram of the structure of a battery module according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic flowchart illustrating a method for preparing a battery cell according to an embodiment of the present invention. Detailed Implementation

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0028] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0030] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0033] It should be understood that when a component is referred to as "on another component," "connected to another component," "coupled to another component," or "in contact with another component," it can be directly on, connected to, coupled to, or in contact with that other component, or there may be an intervening component. In contrast, when a component is referred to as "directly on another component," "directly connected to," "directly coupled to," or "directly in contact with" another component, there is no intervening component. Similarly, when a first component is referred to as "electrically contacting" or "electrically coupled to" a second component, there is an electrical path between the first and second components that allows current to flow. This electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even if there is no direct contact between the conductive components.

[0034] Figure 1 This is an exploded view of a battery cell structure 100 according to an embodiment of the present invention. Figure 1As shown, the battery cell structure 100 includes multiple coils 10, a first L-shaped adapter piece 21, a second L-shaped adapter piece 22, and a battery cell top cover 30. In this embodiment, the battery cell structure 100 includes four batteries 10. Each coil 10 has a first tab 101 and a second tab 102 at opposite ends in a first direction D1. The first tab 101 can be configured as a positive or negative tab, and the polarity of the second tab 102 is opposite to that of the first tab 101. The four coils 10 are arranged adjacent to each other in sequence along a second direction D2, with the first direction D1 perpendicular to the second direction D2. The number of coils 10 included in the battery cell structure 100 can be set as needed, and this application does not limit the number of coils 10. The surfaces of the four coils 10 form the large surface H of the battery cell. The first L-shaped adapter piece 21 has a first side 211 extending along the first direction D1 and a second side 212 extending along the second direction D2. The second L-shaped adapter piece 22 has a first side 221 extending along the first direction D1 and a second side 222 extending along the second direction D2. The first tab 101 and the second tab 102 are initially parallel to the large surface H of the battery cell. The first L-shaped adapter piece 21 is also initially parallel to the large surface H of the battery cell. After the second side 212 is connected to the first tabs 101 of the four winding cores 10, the first L-shaped adapter piece 21 rotates 90° so that the second side 212 and the first tabs 101 are perpendicular to the large surface H of the battery cell. Then, the first L-shaped adapter piece 21 continues to rotate 90° so that the second side 212 and the first tabs 101 are attached to the large surface H of the battery cell. That is, after the second side 212 is connected to the first tabs 101 of the four winding cores 10, it rotates 180° and is attached to the large surface H of the battery cell. At this point, the first side 211 of the first L-shaped adapter piece 21 is parallel to the large surface H of the battery cell. The first side 211 is rotated 90° around the top cover 30 of the battery cell, so that the first side 211 is attached to the top cover 30 of the battery cell. The second L-shaped adapter piece 22 is also initially parallel to the large surface H of the battery cell. After the second side 222 is connected to the second tabs 102 of the four winding cores 10, it is rotated 90° so that the second side 222 and the second tab 102 are perpendicular to the large surface H of the battery cell. Then, the second L-shaped adapter piece 22 is rotated another 90° so that the second side 222 and the second tab 102 are attached to the large surface H of the battery cell. That is, after the second side 222 is connected to the second tabs 102 of the four winding cores 10, it is rotated 180° and attached to the large surface H of the battery cell. At this point, the first side 221 of the second L-shaped adapter piece 22 is parallel to the large surface H of the battery cell. The first side 221 is rotated 90° around the top cover 30 of the battery cell, so that the first side 221 is attached to the top cover 30 of the battery cell. The cell top cover 30 covers the first side 211 and the first side 221. The cell top cover 30 includes a first terminal 301, a second terminal 302, and an explosion-proof valve 303. The first terminal 301 is connected to the first side 211, and the second terminal 302 is connected to the first side 221, thereby guiding the current or voltage inside the core 10 from the tab to the L-shaped adapter and then to the terminal. Figure 1The first tab 101 and the second tab 102 are in the state after being flipped 180°. The second side 212 and the second side 222 are higher than the large surface H of the cell, forming two protrusions on the large surface H of the cell, thereby forming a groove on the large surface H of the cell in the area outside the two protrusions.

[0035] Figure 2A This is a schematic diagram of the structure of the core 10 according to an embodiment of the present invention. Figure 2B yes Figure 1 A schematic diagram of the welding structure between the L-shaped adapter piece and the electrode lug of the winding core. Figure 2A The core 10 in the diagram is the initial state structure diagram, as shown below. Figure 2A The shown core 10 has a first tab 101 and a second tab 102. The first tab 101 and the second tab 102 are initially parallel to the large surface H of the core. To clearly illustrate the state of the L-shaped adapter and the tabs after the L-shaped adapter is flipped and welded to the core, Figure 2B Only the first L-shaped adapter piece 21 is shown in the image; the others are not shown. Figure 1 The second L-shaped adapter piece 22 is shown in Figure 2B. The first L-shaped adapter piece 21 has a first side 211 extending along a first direction D1 and a second side 212 extending along a second direction D2. After the second side 212 is connected to the first tabs of the four winding cores 10, it is rotated 180° and attached to the large surface H of the battery cell. As seen in Figure 2, the first tabs of the four winding cores 10 are covered by the second side 212, so the first tabs of the four winding cores 10 are not shown in Figure 2. The second side 212 is higher than the large surface H of the battery cell, forming a protrusion on the large surface H of the battery cell. After being rotated 180°, the second tab 102 of each winding core 10 is also attached to the large surface H of the battery cell.

[0036] like Figure 1As shown, the cell structure 100 also includes a core connector 40, insulating material, a housing 60, a cover plate 70, and a bottom cover plate 80. The core connector 40 has core positions 401 corresponding to the number of cores, and each core position 401 is isolated from the others. Each core 10 is placed in each core position 401, which can achieve no direct contact between cores, and the thermal runaway of a single core will not spread rapidly to affect other cores. At the same time, it can also ensure that the relative positions of multiple cores 10 and housing 60 are fixed. Housing 60 has protrusions 601 and 602, which are used to semi-enclose the protrusions formed by the second side 212 and the second side 222, respectively, so that the cell is concave in shape. The number of insulating materials corresponds to the number of L-shaped adapter pieces. In this embodiment, the insulating materials include insulating tape 51 and insulating tape 52. Insulating tape 51 is located between the second side 212 and the protrusion 601, and insulating tape 52 is located between the second side 222 and the protrusion 602, used to insulate the second side 212 and the second side 222 from the housing 60. Multiple cores 10 are placed in the core connector 40, the housing 60 supports the core connector 40, the cover plate 70 covers the large surface H of the battery cell, and the bottom cover plate 80 is located on the opposite side of the top cover 30 of the battery cell.

[0037] Figure 3 This is a perspective view of a battery cell structure according to an embodiment of the present invention. The top cover 30, cover plate 70, housing 60, and bottom cover plate 80 form a sealed space for sealing multiple wound cores. The housing 60 has protrusions 601 and 602. Protrusions 601 and 602 are higher than the cover plate 70, resulting in a concave shape for the battery cell. In some embodiments, the cover plate 70 is a PET sheet.

[0038] The parallel arrangement of the wound cores in the cell structure of this invention can be achieved in the length direction ( Figure 1 The capacity is expanded in the D2 direction, and the cell shape has the characteristics of being long and thin, which greatly increases the heat dissipation area; the L-shaped current guiding structure greatly increases the welding width of the tabs, improves the current carrying capacity of the core, and reduces the cell impedance; in this invention, the space occupied by welding the tabs and the adapter is transferred to the large surface of the cell to form a protrusion, which can greatly improve the space utilization rate in the width direction.

[0039] Figure 4 This is an exploded view of a battery module 400 according to an embodiment of the present invention. Figure 4As shown, the battery module 400 includes multiple battery cells 41, aluminum busbars 42, fans 43, and a battery management system board 44. The multiple battery cells 41 have the cell structure 100 described above. In the multiple battery cells 41, at least two cells constitute a cell unit 40. The battery module 400 includes at least one cell unit 40, and this application does not limit the number of cell units 40. The battery management system board 44, fans 43, and aluminum busbars 42 are sequentially located on one side of the cell top cover 411, forming an air-cooled module structure. There are multiple aluminum busbars 42 and fans 43, with each cell unit 40 corresponding to a set of aluminum busbars 42 and fans 43.

[0040] Figure 5 This is a schematic diagram of the self-assembly air duct structure of a battery module according to an embodiment of the present invention. Figure 5 As shown, when multiple battery cells 41 form a battery cell unit 40, a one-dimensional insertion method is used. The multiple battery cells 41 are arranged in close succession, and the adjacent battery cells cooperate to form an air duct F. Figure 6 yes Figure 5 A magnified view of part I in the diagram. (See diagram below.) Figure 6 As shown, multiple battery cells 41 are arranged close together in sequence. Since the battery cell 41 is concave in shape, the large surface A of one of the battery cells 41 and the concave surface B of the other battery cell 41 form an air duct F.

[0041] Continue to refer to Figure 6 In some embodiments, the battery module 400 further includes straps 45, and each cell 41 in the cell unit 40 is secured by at least one strap 45.

[0042] In some embodiments, the battery module 400 further includes a module base plate 46, on which a plurality of battery cells 41 are placed and secured by straps 44.

[0043] Figure 7 This is a schematic diagram of the structure of a battery module 400 according to an embodiment of the present invention. Figure 7 As shown, multiple battery cells 41 form a battery cell unit 40, and each battery cell 41 in the battery cell unit 40 is fixed by two straps 45. The battery module 400 includes multiple sets of battery cell units 40, which are placed on the module base plate 46. Adjacent battery cells 41 in each set of battery cell units 40 cooperate to form an air duct (not shown). The battery management system board 44 controls the activation of a fan (not shown) according to the temperature of the entire battery module 400. The air generated by the fan passes through the air duct of adjacent battery cells 41, maintaining airflow inside the module.

[0044] The battery module of the present invention uses the tab welding and the folding of the adapter to form a protrusion on the large surface to help form an air duct in the module design. This design of the cell shape self-assembling to form an air duct structure can save auxiliary components for the air duct design in the module and help reduce costs. At the module level, the construction of the air duct structure avoids the problem of low space utilization caused by the protrusion of the cell.

[0045] Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed in exact order. Instead, various steps can be processed in reverse order or simultaneously. Furthermore, other operations may be added to these processes, or one or more steps may be removed from these processes.

[0046] Figure 8 This is a schematic flowchart of a battery cell fabrication method 800 according to an embodiment of the present invention. The battery cell fabrication method 800 is suitable for fabricating a battery cell structure having a large surface area and a top cover. The battery cell fabrication method 800 includes the following steps:

[0047] Step S801: Provide multiple cores, each core having a positive electrode tab and a negative electrode tab at both ends in the first direction, and the multiple cores are arranged adjacent to each other in a second direction perpendicular to the first direction.

[0048] Step S802: Provide an L-shaped adapter piece, the L-shaped adapter piece having a first side extending along a first direction and a second side extending along a second direction;

[0049] Step S803: Connect the second side of the L-shaped adapter to the positive or negative tabs of the multiple winding cores;

[0050] Step S804: Fold the connected L-shaped adapter piece and multiple positive or multiple negative tabs 180 degrees so that the second side of the L-shaped adapter piece is attached to the large surface of the cell to form a protrusion, and the area outside the protrusion forms a groove on the large surface of the cell.

[0051] Step S805: Connect the first side of the L-shaped adapter plate to the top cover of the battery cell.

[0052] The following is combined with Figure 1 and Figure 8 The above steps S801-S805 are explained in detail.

[0053] In step S801, the structure of each core provided can be referenced. Figure 1 Core 10 in the middle. For example... Figure 1As shown, each core 10 has a first tab 101 and a second tab 102 at opposite ends in the first direction D1. The first tab 101 can be configured as a positive or negative tab, and the polarity of the second tab 102 is opposite to that of the first tab 101. The four cores 10 are arranged adjacent to each other in sequence along the second direction D2, with the first direction D1 perpendicular to the second direction D2. The surfaces of the four cores 10 form the large surface area H of the battery cell.

[0054] In step S802, the structure of the provided L-shaped adapter piece can be referred to Figure 1 The first L-shaped adapter piece 21 and the second L-shaped adapter piece 22 in the middle. For example... Figure 1 As shown, the first L-shaped adapter 21 has a first side 211 extending along a first direction D1 and a second side 212 extending along a second direction D2. The second L-shaped adapter 22 has a first side 221 extending along the first direction D1 and a second side 222 extending along the second direction D2.

[0055] In steps S803-S804, the second side of the L-shaped adapter piece is connected to the positive or negative electrode tabs of multiple cores. The connected L-shaped adapter piece and the multiple positive or negative electrode tabs are then folded 180 degrees so that the second side of the L-shaped adapter piece adheres to the large surface of the battery cell to form a protrusion. The process of forming a groove on the large surface of the battery cell in the area outside the protrusion can be referred to further. Figure 1 .like Figure 1 As shown, the initial state of the first tab 101 and the second tab 102 is parallel to the large surface H of the battery cell, and the initial state of the second side 212 is also parallel to the large surface H of the battery cell. After the second side 212 is connected to the first tab 101 of the four winding cores 10, it is rotated 90° so that the second side 212 and the first tab 101 are perpendicular to the large surface H of the battery cell. Then it is rotated another 90° so that the second side 212 and the first tab 101 are attached to the large surface H of the battery cell. That is, after the second side 212 is connected to the first tab 101 of the four winding cores 10, it is rotated 180° and attached to the large surface H of the battery cell. The initial state of the second side 222 is also parallel to the large surface H of the battery cell. After the second side 222 is connected to the second tab 102 of the four winding cores 10, it is rotated 90° so that the second side 222 and the second tab 102 are perpendicular to the large surface H of the battery cell. Then it is rotated another 90° so that the second side 222 and the second tab 102 are attached to the large surface H of the battery cell. That is, after the second side 222 is connected to the second tab 102 of the four winding cores 10, it is rotated 180° and attached to the large surface H of the battery cell. Figure 1 The first tab 101 and the second tab 102 are in the state after being flipped 180°. The second side 212 and the second side 222 are higher than the large surface H of the cell, forming two protrusions on the large surface H of the cell, thereby forming a groove on the large surface H of the cell in the area outside the two protrusions.

[0056] In step S805, the top cover of the battery cell includes a terminal post, and the first side of the L-shaped adapter piece is connected to the terminal post of the top cover of the battery cell, thereby guiding the current or voltage inside the core from the tab and the first side to the terminal post outside the battery cell.

[0057] In some embodiments, the method 800 for preparing a battery cell further includes the step of: placing a plurality of cores into a core connector, the core connector having core positions corresponding to the number of cores, each core being placed into each core position, which can achieve no direct contact between cores, and prevent rapid spread of thermal runaway of a single core to affect other cores; at the same time, it can also ensure that the relative positions of the plurality of cores and the housing are fixed.

[0058] In some embodiments, the method 800 for preparing the battery cell further includes the step of: attaching an insulating material to the surface of the protrusion to insulate the protrusion from the housing 60. The insulating material may be insulating tape, and this application does not limit the material of the insulating material.

[0059] In some embodiments, the cell manufacturing method 800 further includes the steps of: assembling the cell structure prepared in step S805 into a receiving space composed of a housing, a PET plate and a bottom cover plate, and then completing the sealing welding of the cell top cover and the housing.

[0060] The battery cell manufacturing method of the present invention uses an L-shaped adapter plate to weld and connect the positive or negative electrode tabs of multiple wound cores in parallel, which significantly increases the welding width of the tabs, improves the current carrying capacity of the wound cores, and reduces the battery cell impedance. At the same time, the number of wound cores in the battery cell can be set as needed, and the parallel arrangement of wound cores can realize the capacity expansion of the battery cell in the length direction. The battery cell has a long and thin shape, which greatly increases the heat dissipation area.

[0061] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0062] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0063] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0064] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0065] Although this application has been described with reference to specific embodiments, those skilled in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, any changes or modifications to the above embodiments within the essential spirit of this application will fall within the scope of the claims of this application.

Claims

1. A battery cell structure having a large surface area and a top cover, characterized in that, The cell structure includes: Multiple winding cores, each winding core having a positive electrode tab and a negative electrode tab at both ends in a first direction, and the multiple winding cores are arranged adjacent to each other in a second direction perpendicular to the first direction; and At least one L-shaped adapter piece, the L-shaped adapter piece having a first side extending along the first direction and a second side extending along the second direction, wherein the first side is connected to the top cover of the battery cell, and the second side is connected to the positive or negative electrode tab of the plurality of winding cores and then flipped and attached to the large surface of the battery cell to form a protrusion on the large surface of the battery cell, thereby forming a groove on the large surface of the battery cell in the area outside the protrusion.

2. The cell structure as described in claim 1, characterized in that, The protrusion is formed from the second side and rotates 180 degrees after being connected to the positive electrode tab or the negative electrode tab.

3. The cell structure as described in claim 1 or 2, characterized in that, Insulating material is attached to the outer surface of the second side.

4. The cell structure as described in claim 1, characterized in that, It also includes a core connector having a plurality of core positions adapted to hold the plurality of cores, each core position for holding one core.

5. The cell structure as described in claim 1 or 4, characterized in that, It also includes a cover plate, a housing, and a bottom cover plate, wherein the cover plate covers the large surface of the battery cell, the housing supports the battery cell structure from the other side of the large surface of the battery cell, and the bottom cover plate is located on the opposite side of the top cover of the battery cell. The top cover of the battery cell, the cover plate, the housing, and the bottom cover plate form a sealed space, which is used to seal the plurality of wound cores.

6. The cell structure as described in claim 5, characterized in that, The housing has a protrusion that is adapted to partially surround the protrusion.

7. A battery module, characterized in that, The device includes an aluminum busbar, a fan, a BMS board, and multiple battery cells, wherein the multiple battery cells have the battery cell structure as described in any one of claims 1 to 6, wherein the BMS board, the aluminum busbar, and the fan are located sequentially on one side of the top cover of the multiple battery cells.

8. The battery module as described in claim 7, characterized in that, It also includes a module base plate and binding straps, with the plurality of battery cells placed on the module base plate and secured by the binding straps.

9. The battery module as described in claim 8, characterized in that, In the plurality of battery cells, at least two battery cells constitute a battery cell unit, and there are multiple aluminum busbars and fans. In each battery cell unit, the battery cells are fixed by at least one strap, and each battery cell unit corresponds to a set of aluminum busbars and fans.

10. A method for preparing a battery cell, characterized in that, A method suitable for fabricating a battery cell structure having a large cell surface and a cell top cover, the fabrication method comprising the following steps: Multiple cores are provided, each core having a positive electrode tab and a negative electrode tab at both ends in a first direction, and the multiple cores are arranged adjacent to each other in a second direction perpendicular to the first direction. An L-shaped adapter is provided, the L-shaped adapter having a first side extending along a first direction and a second side extending along a second direction; Connect the second side of the L-shaped adapter piece to the positive or negative electrode tab of the plurality of winding cores; The connected L-shaped adapter piece and multiple positive or negative electrode tabs are folded 180 degrees so that the second edge of the L-shaped adapter piece is attached to the large surface of the battery cell to form a protrusion, and the area outside the protrusion forms a groove on the large surface of the battery cell; and Connect the first side of the L-shaped adapter piece to the top cover of the battery cell.

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