Hexagonal prism lithium ion battery

Abstract

The utility model provides a hexagonal prism lithium ion battery and relates to the technical field of batteries. The hexagonal prism lithium ion battery comprises an outer shell which is provided with a containing cavity, and the contour molded line of the cross section of the outer shell is hexagonal; the roll core is located in the containing cavity, and the cross section of the roll core is hexagonal; and the cover plate assembly is connected with the two ends of the outer shell so as to seal the roll core, and the profile of the outer contour of the cover plate assembly is hexagonal. According to the technical scheme provided by the utility model, the contour molded line of the cross section of the outer shell, the cross section of the roll core and the outer contour molded line of the cover plate assembly are all set to be regular hexagons, so that three adjacent hexagonal prism lithium ion batteries can be seamlessly jointed when the battery is assembled, and the lithium ion battery has higher battery capacity and battery energy density than a cylindrical battery with the same size; meanwhile, the structural strength of the battery can be improved by fully utilizing the assembly space, and the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a hexagonal lithium-ion battery. Background Art

[0002] There are many types of existing batteries, including cylindrical batteries, square batteries, soft-package batteries, etc., but they all have problems such as poor battery energy density and low space utilization to varying degrees. For example, the structure of the cylindrical battery PACK in the prior art easily causes space waste, and there are problems such as low battery capacity and poor battery pack safety.

[0003] Currently, no effective solution has been proposed for the above-mentioned technical problems of low battery PACK space utilization, low battery capacity, and poor battery energy density. Utility Model Content

[0004] The main purpose of the utility model is to provide a hexagonal lithium-ion battery to solve the problems of low battery PACK space utilization, low battery capacity and poor battery energy density in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a hexagonal lithium-ion battery is provided, comprising: an outer shell, the outer shell having a accommodating cavity, the outer shell cross-section having a hexagonal contour line; a winding core, the winding core is located in the accommodating cavity, the cross-section of the winding core is hexagonal; a cover plate assembly, the cover plate assembly is connected to both ends of the outer shell to seal the winding core, and the outer contour line of the cover plate assembly is a hexagon.

[0006] Furthermore, the winding core includes a winding core body and a positive electrode ear and a negative electrode ear arranged at two ends of the winding core body, and the positive electrode ear and the negative electrode ear are respectively welded to the cover plate assembly.

[0007] Furthermore, the cover plate assembly includes a positive cover plate, which is arranged at one end of the outer shell, and a first current collecting plate is provided on one side of the positive cover plate close to the positive electrode ear, and the positive electrode ear is connected to the first current collecting plate.

[0008] Furthermore, the cover plate assembly includes a negative cover plate, which is arranged at the other end of the outer shell, and a second current collecting plate is provided on one side of the negative cover plate close to the negative electrode ear, and the negative electrode ear is connected to the second current collecting plate.

[0009] Furthermore, the positive electrode tab is welded to the first current collecting disc, and the negative electrode tab is welded to the second current collecting disc.

[0010] Furthermore, the first current collecting plate and the second current collecting plate are in the shape of hexagonal prisms.

[0011] Furthermore, the outer contour lines of the positive electrode cover plate and the negative electrode cover plate are hexagonal.

[0012] Furthermore, the hexagonal lithium-ion battery also includes: a central tube, which is inserted into the interior of the winding core and arranged along the height direction of the winding core, and the cross-section of the central tube is hexagonal.

[0013] Furthermore, the positive electrode ear is made of any one of aluminum, nickel and copper, and the positive electrode ear is a full-electrode ear.

[0014] Furthermore, the negative electrode ear is made of any one of aluminum, nickel and copper, and the negative electrode ear is a full electrode ear.

[0015] By applying the technical solution of the utility model, the contour line of the cross section of the outer shell, the cross section of the winding core and the outer contour line of the cover plate assembly are all set to regular hexagons, so that when the battery is PACKed, three adjacent hexagonal lithium ions can be seamlessly fitted together, which has higher battery capacity and battery energy density than cylindrical batteries of the same size. At the same time, full utilization of the PACK space can increase the structural strength of the battery and improve the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a first embodiment of a hexagonal lithium-ion battery according to the utility model is shown;

[0018] Figure 2 A schematic structural diagram of a second embodiment of a hexagonal lithium-ion battery according to the utility model is shown;

[0019] Figure 3 A schematic structural diagram of a third embodiment of a hexagonal lithium-ion battery according to the utility model is shown;

[0020] Figure 4 A structural schematic diagram of a fourth embodiment of a hexagonal lithium-ion battery according to the utility model is shown;

[0021] Figure 5 A schematic structural diagram of a fifth embodiment of a hexagonal lithium-ion battery according to the utility model is shown;

[0022] Figure 6 A schematic structural diagram of an embodiment of a hexagonal lithium-ion battery PACK according to the utility model is shown;

[0023] Figure 7 A schematic structural diagram of an embodiment of a cylindrical battery PACK according to the prior art is shown.

[0024] The above drawings include the following reference numerals:

[0025] 41. winding core; 42. outer shell; 43. negative electrode cover plate; 44. positive electrode cover plate; 45. center tube. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0030] Combination Figures 1 to 7 As shown, according to a specific embodiment of the utility model, a hexagonal lithium-ion battery is provided.

[0031] Specifically, Figure 1 and Figure 2As shown, the hexagonal lithium-ion battery includes an outer shell 42, a winding core 41 and a cover plate assembly, the outer shell 42 has a accommodating cavity, and the contour line of the cross section of the outer shell 42 is hexagonal; the winding core 41 is located in the accommodating cavity, and the cross section of the winding core 41 is hexagonal; the cover plate assembly is connected to both ends of the outer shell 42 to seal the winding core 41, and the outer contour line of the cover plate assembly is hexagonal.

[0032] By applying the technical solution of the utility model, the contour line of the cross section of the outer shell 42, the cross section of the winding core 41 and the outer contour line of the cover assembly are all set to regular hexagons, so that the three adjacent hexagonal lithium ions can be seamlessly fitted together when the battery is PACKed. The battery capacity and battery energy density are higher than those of cylindrical batteries of the same size. At the same time, full utilization of the PACK space can increase the structural strength of the battery and improve the safety of the battery.

[0033] Specifically, the core 41 includes a core body and positive and negative ears arranged at both ends of the core body, and the positive and negative ears are respectively welded to the cover assembly. This arrangement allows the core 41 and the cover assembly to be integrated, so that the cover assembly can not only seal the core 41, but also increase the structural strength of the core 41, and prevent the hexagonal lithium-ion battery from being squeezed by the cover assembly to damage the core 41. At the same time, the connection method of welding the positive and negative ears to the cover assembly ensures the structural strength of the core 41 and the conductivity of the positive and negative ears, and prevents the cover assembly from affecting the working efficiency of the battery after sealing the core 41.

[0034] Specifically, Figure 2 As shown, the cover plate assembly includes a positive cover plate 44, which is arranged at one end of the outer shell 42. A first current collecting plate is arranged on the side of the positive cover plate 44 close to the positive electrode ear, and the positive electrode ear is connected to the first current collecting plate. This arrangement can accurately collect the current signal of the positive electrode ear and transmit the current signal to other electrical devices connected thereto through the first current collecting plate, thereby improving the working efficiency of the battery.

[0035] Specifically, the cover plate assembly includes a negative electrode cover plate 43, which is arranged at the other end of the outer shell 42. A second current collecting plate is arranged on the side of the negative electrode cover plate 43 close to the negative electrode ear, and the negative electrode ear is connected to the second current collecting plate. This arrangement can accurately collect current signals of other electrical devices connected to the second current collecting plate and transmit the current signals to the negative electrode ear through the second current collecting plate, thereby improving the working efficiency of the battery.

[0036] The positive electrode ear is welded to the first current collecting disc, and the negative electrode ear is welded to the second current collecting disc. This arrangement can ensure good conductivity between the first current collecting disc and the positive electrode ear and between the second current collecting disc and the negative electrode ear, improve structural strength, and improve the efficiency and stability of the battery during operation.

[0037] Specifically, the first current collecting disc and the second current collecting disc are in the shape of a hexagonal prism. This arrangement allows the first current collecting disc and the second current collecting disc to be completely fitted with the positive electrode ear and the negative electrode ear, respectively, to avoid incomplete contact with the positive electrode ear and the negative electrode ear, which may weaken the current signals output and input by the positive electrode ear and the negative electrode ear, thereby reducing the performance of the battery.

[0038] Furthermore, the outer contours of the positive electrode cover plate 44 and the negative electrode cover plate 43 are hexagonal. This configuration can match the contour of the regular hexagonal cross section of the outer shell 42 so that the positive electrode cover plate 44 and the negative electrode cover plate 43 are covered on the outer shell 42, thereby improving the effect of the positive electrode cover plate 44 and the negative electrode cover plate 43 sealing the winding core 41.

[0039] Furthermore, the hexagonal lithium-ion battery further includes a central tube 45, such as Figure 4 and Figure 5 As shown, the central tube 45 is inserted into the winding core 41 and arranged along the height direction of the winding core 41, and the cross section of the central tube 45 is hexagonal. The central tube 45 can support the battery structure and protect the winding core 41. The cross section of the central tube 45 is set to be hexagonal so that the central tube 45 can support the battery cell of the hexagonal lithium-ion battery and support the winding core 41 at the same time, so that the winding core 41 maintains the hexagonal shape, thereby maintaining the uniform distribution of the battery capacity and energy density.

[0040] Furthermore, the positive pole ear is made of any one of aluminum, nickel and copper, and the positive pole ear is a full pole ear. The full pole ear setting of the positive pole ear can improve the rate performance of the battery, reduce the internal resistance of the battery to reduce the heat generated by the internal resistance of the pole ear, thereby reducing the loss of the battery cell. Compared with the composite pole ear, the full pole ear setting can make the battery system more efficient, more energy dense, lower cost and more stable in structure.

[0041] Furthermore, the negative electrode ear is made of any one of aluminum, nickel and copper, and the negative electrode ear is a full-electrode ear. The full-electrode ear setting of the negative electrode ear can improve the rate performance of the battery, reduce the internal resistance of the battery to reduce the heat generated by the internal resistance of the ear, and thus reduce the loss of the battery cell. Compared with the composite ear, the full-electrode ear setting can make the battery system more efficient, more energy dense, lower cost, and more stable in structure.

[0042] It should be noted that the positive electrode tab and the negative electrode tab can be made of any one of aluminum, nickel and copper, or two or three of the above materials, or an alloy of the above two or three materials to form a composite tab to meet the needs of different applications such as energy storage, sensing, and electrocatalysis.

[0043] The utility model also provides a preferred embodiment of a hexagonal lithium-ion battery. In view of the problems of cylindrical battery structure in the prior art, the hexagonal lithium-ion battery has higher capacity and energy density, and higher structural strength to improve the safety of the battery.

[0044] Specifically, Figure 1 As shown, the hexagonal lithium-ion battery includes a winding core 41, an outer shell 42, a negative electrode cover plate 43, a positive electrode cover plate 44 and a central tube 45. The two ends of the winding core 41 are a positive electrode ear at one end and a negative electrode ear at the other end. When assembling, the winding core 41 is placed inside the outer shell 42, the negative end of the winding core 41 is welded to the negative electrode cover plate 43, and the positive end of the winding core 41 is welded to the positive electrode cover plate 44. The winding core 41 is set to a hexagonal prism shape, and the positive and negative electrode sheets are wound around the winding core 41 using a hexagonal winding needle. When assembling, the center hole uses a hexagonal central tube 45; the winding core 41 is a full-ear, and the positive electrode cover plate 44 and the negative electrode cover plate 43 are both hexagonal. After the winding core 41 is loaded into the hexagonal outer shell 42, the positive and negative electrode ears of the winding core 41 are respectively fitted with the second collector plate and the first collector plate on the positive cover plate 44 and the negative cover plate 43 for laser welding, and the process is mature and the operation is simple.

[0045] When processing hexagonal lithium-ion batteries, the specific operating steps and principles are as follows:

[0046] The coated positive and negative electrode sheets and isolation film are wound into a hexagonal core 41 using a hexagonal winding needle according to the process requirements; a hexagonal central tube 45 is inserted into the middle of the rolled hexagonal core 41; the core 41 that has entered the central tube 45 is transferred to the ear kneading process, and the positive and negative ears are first ultrasonically welded and then mechanically flattened; the flattened core 41 is transferred to the shelling process for shelling, and the shelled core 41 is transferred to the current collecting plate welding process; after the current collecting plate is welded, the cover plate and the outer shell 42 are welded, and the battery cell is completed, and is baked, injected with liquid once, aged, formed, left to stand at high temperature, sealed, divided into volumes and coated according to the production process.

[0047] After the hexagonal battery is produced, Figure 6 The PACK method shown in the figure can be used for assembly, and the batteries can be completely fitted together, which has a higher structural strength than the cylindrical battery PACK method in the prior art. Figure 7 As shown, the safety of the battery can be improved.

[0048] It can be seen from the above description that the hexagonal lithium-ion battery in the present application is manufactured and PACK-assembled in a hexagonal shape, which produces the following beneficial effects:

[0049] 1) The hexagonal shape has higher capacity and higher energy density than cylindrical batteries of the same size.

[0050] 2) The hexagonal packaging can increase the structural strength of the battery and improve the safety of the battery.

[0051] 3) Hexagonal batteries can be prepared by using the existing battery materials and production processes of the cylindrical production line with appropriate adjustments, and the preparation cost is relatively low.

[0052] 4) The hexagonal pole lug cover and the hexagonal current collecting plate are welded by laser welding process. The laser welding process is mature and easy to operate.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present utility model.

[0055] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A hexagonal lithium-ion battery, characterized in that: include: An outer shell (42), the outer shell (42) having a receiving cavity, and a cross-sectional profile of the outer shell (42) being hexagonal; A winding core (41), the winding core (41) being located in the accommodating cavity, and the cross section of the winding core (41) being hexagonal; A cover plate assembly, the cover plate assembly is connected to both ends of the outer shell (42) to seal the winding core (41), and the outer contour line of the cover plate assembly is a hexagon; the winding core (41) comprises a winding core body and a positive electrode ear and a negative electrode ear arranged at both ends of the winding core body, and the positive electrode ear and the negative electrode ear are respectively welded to the cover plate assembly.

2. The hexagonal lithium-ion battery according to claim 1, characterized in that: The cover plate assembly comprises a positive cover plate (44), the positive cover plate (44) being arranged at one end of the outer shell (42), a first current collecting plate being arranged on a side of the positive cover plate (44) close to the positive electrode ear, the positive electrode ear being connected to the first current collecting plate.

3. The hexagonal lithium-ion battery according to claim 2, characterized in that: The cover plate assembly comprises a negative electrode cover plate (43), the negative electrode cover plate (43) being arranged at the other end of the outer shell (42), a second current collecting plate being arranged on a side of the negative electrode cover plate (43) close to the negative electrode ear, and the negative electrode ear being connected to the second current collecting plate.

4. The hexagonal lithium-ion battery according to claim 3, characterized in that: The positive electrode tab is welded to the first current collecting disk, and the negative electrode tab is welded to the second current collecting disk.

5. The hexagonal lithium-ion battery according to claim 4, characterized in that: The first current collecting plate and the second current collecting plate are in the shape of hexagonal prisms.

6. The hexagonal lithium-ion battery according to claim 3, characterized in that: The outer contour lines of the positive electrode cover plate (44) and the negative electrode cover plate (43) are hexagonal.

7. The hexagonal lithium-ion battery according to claim 1, characterized in that: The hexagonal lithium-ion battery also includes: A central tube (45), the central tube (45) is inserted into the interior of the winding core (41), and the central tube (45) is arranged along the height direction of the winding core (41), and the cross section of the central tube (45) is hexagonal.

8. The hexagonal lithium-ion battery according to claim 1, characterized in that: The positive electrode lug is made of any one of aluminum, nickel and copper, and the positive electrode lug is a full-pole lug.

9. The hexagonal lithium-ion battery according to claim 1, characterized in that: The negative electrode ear is made of any one of aluminum, nickel and copper, and the negative electrode ear is a full-electrode ear.

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