Battery cell and battery module

Abstract

The utility model provides a battery cell and a battery module, and the battery cell comprises a shell provided with an accommodating cavity; the top cover assembly is arranged on the shell in a covering mode, and the top cover assembly comprises lower plastic cement; the core bag is arranged in the containing cavity, the side, facing the top cover assembly, of the core bag is provided with a protruding part, a step structure is formed between the protruding part and the edge of the core bag, the step structure is provided with a step face extending in the radial direction of the core bag, and the end, close to the core bag, of the lower plastic is used for abutting against the step face. By applying the technical scheme of the utility model, the technical problem that the connecting sheet is easy to break can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric core, concretely relates to an electric core and battery module. BACKGROUND

[0002] The existing electric core connects the top cover and the core package through the connecting sheet, but the current core package is designed as a gap fit design, and there is a gap between the top cover and the core package, so that the connecting sheet may be broken in the vibration test, thereby reducing the safety and stability of the electric core during operation. SUMMARY

[0003] The embodiment of the utility model provides a kind of electric core and battery module, can improve the technical problem that connecting sheet is easily broken.

[0004] In a first aspect, the embodiment of the utility model provides an electric core, which includes: a shell having a receiving cavity; a top cover assembly covering the shell, the top cover assembly including a lower plastic; a core package arranged in the receiving cavity, the side of the core package facing the top cover assembly having a protruding portion, a step structure being formed between the protruding portion and the edge of the core package, the step structure having a stepped surface extending radially along the core package, and the end of the lower plastic close to the core package being used to abut against the stepped surface.

[0005] In an embodiment, the lower plastic includes a first plastic extending axially along the core package and a second plastic extending radially along the core package, and the end of the first plastic close to the core package is used to abut against the stepped surface.

[0006] In an embodiment, the extension length of the stepped surface in the radial direction of the core package is L1, the extension length of the first plastic in the radial direction of the core package is L2, and 0.1≤L1:L2≤1.

[0007] In an embodiment, the distance between the top wall of the protruding portion and the bottom wall of the second plastic in the axial direction of the core package is L3, the extension length of the protruding portion in the axial direction of the core package is L4, and 0.5≤L3:L4≤0.9.

[0008] In an embodiment, 1mm≤L4≤4mm.

[0009] In an embodiment, the top cover assembly further includes a connecting sheet, the connecting sheet being used to electrically connect with the protruding portion, the extension length of the contact surface between the connecting sheet and the protruding portion in the radial direction of the core package is L5, the extension length of the protruding portion in the radial direction of the core package is L6, and 0.4≤L5:L6≤0.8.

[0010] In an embodiment, 30mm≤L6≤40mm.

[0011] In an embodiment, the protruding portion includes a positive electrode tab or a negative electrode tab.

[0012] In an embodiment, the core package has a radial distribution of a cutting region and an original region, the protruding portion is located in the original region, at least part of the tab and / or the winding core in the cutting region is configured to be cut along the radial direction of the core package, and the extension length of the part of the core package in the axial direction of the core package is less than the extension length of the part of the core package in the axial direction of the core package.

[0013] In a second aspect, the embodiments of the utility model provide a battery module, the battery module includes the above-mentioned electric core.

[0014] The utility model discloses a technology scheme, set up the step structure at the edge of core package, and the end of lower plastic is used for with the abutment of ladder face close to core package, like this can use ladder face to support lower plastic, so can make core package top real top cap, prevent core package and top cap assembly sway, because core package and top cap assembly are connected through connecting sheet, can reduce the fracture possibility of connecting sheet. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0016] Fig. 1 It is the cross section schematic view of the electric core provided by the embodiment of the utility model;

[0017] Fig. 2 It is the label schematic view of the electric core provided by the embodiment of the utility model;

[0018] Fig. 3 It is the side surface schematic view of the top cap assembly provided by the embodiment of the utility model;

[0019] Fig. 4 It is the bottom view schematic view of the top cap assembly provided by the embodiment of the utility model.

[0020] Among them, the above-mentioned drawing includes the following figure marks:

[0021] Electric core 1, shell 10, containing cavity 11, top cap assembly 20, lower plastic 21, first plastic 211, second plastic 212, core package 30, protruding portion 31, ladder face 32, connecting sheet 40, cutting region A, original region B. DETAILED DESCRIPTION

[0022] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] As Figs. 1 to 4 described, in the first aspect, the embodiments of the present application provide an electric core 1, the electric core 1 comprises: a shell 10, having a containing cavity 11;A top cover assembly 20 is arranged on the shell 10, and the top cover assembly 20 comprises a lower plastic 21;A core bag 30 is arranged in the containing cavity 11, and the side of the core bag 30 towards the top cover assembly 20 has a protruding part 31, the protruding part 31 and the edge of the core bag 30 form a step structure, the step structure has a ladder surface 32 extending along the radial direction of the core bag 30, and the end of the lower plastic 21 close to the core bag 30 is used for abutting against the ladder surface 32.

[0024] The technical scheme of the present application is applied to the edge of the core bag 30 to set the step structure, and the end of the lower plastic 21 close to the core bag 30 is used for abutting against the ladder surface 32, so that the ladder surface 32 can be used to support the lower plastic 21, so that the core bag 30 can be supported by the top cover, and the core bag 30 and the top cover assembly 20 can be prevented from shaking, since the core bag 30 and the top cover assembly 20 are connected through the connecting piece 40, so that the possibility of breaking of the connecting piece 40 can be reduced.

[0025] In the present application, the material of the lower plastic 21 can be selected from polyamide (PA): having good mechanical strength and wear resistance. Good chemical corrosion resistance, can resist the erosion of various chemicals. Excellent electrical insulation performance, suitable for battery components that require electrical insulation protection. Or polycarbonate (PC): has excellent transparency and gloss. Good impact toughness and heat resistance. Good electrical insulation performance and chemical corrosion resistance, suitable for battery shell, battery box and other components.

[0026] In one embodiment, the lower plastic 21 includes a first plastic 211 extending axially along the core wrap 30 and a second plastic 212 extending radially along the core wrap 30. The first plastic 211 is proximate to one end of the core wrap 30 for abutting the stepped surface 32. Structural stability: The first plastic 211 extends axially along the core wrap 30, which helps to enhance the stability of the plastic structure in the axial direction. This design enables the plastic to better resist tensile or compressive forces in the axial direction, thereby improving the durability of the overall structure. The second plastic 212 extends radially along the core wrap 30, which helps to increase the contact area between the plastic and the core wrap 30, improving the firmness of the connection. This radial extension design can also effectively distribute stress, preventing the plastic from breaking or deforming when subjected to external forces. When the first plastic 211 abuts the stepped surface 32, a tight sealing structure can be formed. This sealing performance helps to prevent leakage, ensuring the normal operation of the system. At the same time, this design of the plastic structure makes the assembly process more convenient. Since the plastic has a certain elasticity, it can be more easily matched with the core wrap 30 and the stepped surface 32, without the need for complex assembly tools or processes. In addition, the easy processability of the plastic also makes this structure more flexible in the manufacturing process, allowing for customization and adjustment according to actual needs.

[0027] In one embodiment, the stepped surface 32 extends radially along the core wrap 30 by a length L1, and the first plastic 211 extends radially along the core wrap 30 by a length L2, with 0.1 ≤ L1: L2 ≤ 1. Within this ratio range, the first plastic 211 can fully contact the stepped surface 32, forming a stable structural connection. This design enhances the connection strength between components, helping to resist external impact and vibration, thereby improving the stability of the overall structure. When the ratio of L1 to L2 is moderate, the first plastic 211 can better fill the gap between the stepped surface 32 and the core wrap 30, forming a tight seal. This helps to prevent leakage, ensuring the normal operation of the battery. By adjusting the ratio of L1 to L2, the utilization of materials can be optimized. While maintaining structural stability and sealing performance, unnecessary material waste is reduced. This helps to reduce costs and improve production efficiency. This design makes the assembly process more convenient. Since the first plastic 211 can flexibly adapt to the shape and size of the stepped surface 32, a tight fit can be achieved without complex assembly tools or processes. This reduces the difficulty of assembly and improves production efficiency. Since the ratio of L1 to L2 has a certain range, this design can adapt to core wraps 30 and stepped surfaces 32 of different sizes and shapes. This provides design flexibility, allowing for adjustments according to specific application requirements and performance requirements.

[0028] In an embodiment, the distance between the top wall of the protrusion 31 and the bottom wall of the second plastic 212 in the axial direction of the core wrap 30 is L3, and the extension length of the protrusion 31 in the axial direction of the core wrap 30 is L4, 0.5≤L3:L4≤0.9. Within this ratio range, the distance L3 between the protrusion 31 and the second plastic 212 is relatively small, while the extension length L4 of the protrusion 31 is relatively moderate. This design makes the overall structure more compact, helping to save space and improve the integration and efficiency of the device. Because the ratio of L3 to L4 is moderate, the protrusion 31 can be firmly connected with the second plastic 212. This stable connection helps to resist external impact and vibration, preventing parts from loosening or falling off, thereby improving the reliability and durability of the device. The design of the protrusion 31 helps to disperse stress. When subjected to external force, the protrusion 31 can absorb part of the stress and disperse it to the second plastic 212 and other components. This helps to reduce stress concentration and reduce the risk of component damage.

[0029] Because the distance and extension length between the protrusion 31 and the second plastic 212 are carefully calculated, precise fitting can be achieved more easily without the need for complex assembly tools or processes. In some applications, such as battery packs or electronic devices, thermal management is a key factor. By adjusting the ratio of L3 to L4, the heat transfer path between the protrusion 31, the second plastic 212 and other components can be optimized. This helps to improve heat dissipation efficiency, reduce temperature gradient, and prevent overheating and damage. By carefully designing the size and ratio of the protrusion 31 and the second plastic 212, the use of materials can be optimized. While maintaining structural stability and connection strength, unnecessary material waste is reduced. This helps to reduce costs and improve production efficiency. Because the ratio of L3 to L4 has a certain range, this design can adapt to different sizes and shapes of the core wrap 30, the protrusion 31 and the second plastic 212. This provides design flexibility, which can be adjusted according to specific application requirements and performance requirements.

[0030] In an embodiment, 1mm≤L4≤4mm. When L4 is within the range of 1mm to 4mm, the size of the protrusion 31 in the axial direction of the core wrap 30 can be more precisely controlled. This precise spatial control helps to meet the size requirements in specific application scenarios, ensuring that the overall size and shape of the device meet expectations. The extension length of the protrusion 31 as part of the connection or support structure directly affects the overall load capacity and stability. Within this range, the protrusion 31 can provide the necessary support while avoiding excessive weight and cost. The size of the protrusion 31 also has an impact on thermal management performance. Within the range of 1mm to 4mm, the protrusion 31 can effectively guide heat transfer, reduce thermal resistance, and improve heat dissipation efficiency.

[0031] By precisely controlling the size of L4, the material can be used more efficiently. Within this range, the protrusion 31 can meet the functional requirements and reduce unnecessary material waste, reducing production costs. The appropriate size of L4 makes the protrusion 31 easier to handle during assembly and manufacturing. Smaller size helps to reduce assembly errors and improve manufacturing accuracy. At the same time, it also reduces the requirements for manufacturing equipment and processes, making production more flexible and efficient. The L4 size range of 1mm to 4mm provides greater design flexibility. Designers can adjust the size of the protrusion 31 within this range according to specific application requirements and performance requirements to adapt to different working environments and conditions.

[0032] In an embodiment, the top cover assembly 20 further comprises a connecting tab 40 for electrical connection with the protrusion 31, the extension length of the contact surface of the connecting tab 40 in the radial direction of the core wrap 30 is L5, the extension length of the protrusion 31 in the radial direction of the core wrap 30 is L6, and 0.4≤L5:L6≤0.8. Within this ratio range, the contact area of the connecting tab 40 and the protrusion 31 is moderate, ensuring good electrical connection performance. This helps to reduce contact resistance and improve current transmission efficiency, thereby ensuring the normal operation of the battery. The appropriate L5 and L6 ratio helps to enhance the structural stability between the connecting tab 40 and the protrusion 31. This stability is crucial for resisting external impact and vibration, preventing loose or falling connections, and improving the reliability and durability of the device. Good contact between the connecting tab 40 and the protrusion 31 helps to effectively transfer heat. Within this ratio range, heat can be more evenly distributed between the connecting tab 40 and the protrusion 31, thereby improving heat dissipation efficiency, reducing temperature gradient, and preventing overheating and damage. By precisely controlling the ratio of L5 and L6, the material can be used more efficiently. Within this range, the connecting tab 40 can meet the electrical connection requirements and reduce unnecessary material waste, reducing production costs. The appropriate L5 and L6 ratio makes the assembly process easier. The fit between the connecting tab 40 and the protrusion 31 is tighter, reducing assembly errors and improving manufacturing accuracy. At the same time, it also reduces the requirements for assembly equipment and processes, making production more flexible and efficient.

[0033] In an embodiment, 30mm≤L6≤40mm. When L6 is in the range of 30mm to 40mm, the protrusion 31 provides sufficient contact area. This is important to ensure good connection between the protrusion 31 and other components (such as the connecting tab 40, the housing, etc.). Sufficient contact area helps to reduce contact resistance, improve current transmission efficiency, and also helps to enhance the stability of the structure. A proper L6 size provides sufficient structural strength. The protrusion 31 as part of the connecting or supporting structure, its extension length directly affects the overall load bearing capacity and stability. Within this range, the protrusion 31 can provide the necessary support while avoiding excessive weight and cost, thus ensuring the overall performance and reliability of the device.

[0034] In an embodiment, the protrusion 31 comprises a positive electrode tab or a negative electrode tab.

[0035] In an embodiment, the jelly-roll 30 has a radial distribution of a cutting area A and an original area B, the protrusion 31 is located in the original area B, at least part of the tabs and / or the winding core in the cutting area A is configured to be cut along the radial direction of the jelly-roll 30, the extension length of the part of the jelly-roll 30 located in the cutting area A in the axial direction of the jelly-roll 30 is less than the extension length of the part of the jelly-roll 30 located in the original area B in the axial direction of the jelly-roll 30.

[0036] In a second aspect, the embodiments of the utility model provide a battery module, the battery module comprises the above-mentioned battery core 1.

[0037] The utility model discloses a technology scheme, set up the step structure at the edge of jelly-roll 30, and the end of lower plastic 21 is used for abutting with ladder face 32 close to jelly-roll 30, like this can use ladder face 32 to support lower plastic 21, like this can make jelly-roll 30 top real top cover, prevent jelly-roll 30 and top cover subassembly 20 sway, because jelly-roll 30 and top cover subassembly 20 are connected through connecting tab 40, thereby can reduce the fracture possibility of connecting tab 40.

[0038] The application also provides a battery pack, which comprises the battery module. The specific structure of the battery module is referred to the above embodiments. Since the battery pack adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0039] In addition, the application also provides a power consumption device, which comprises the battery pack. The specific structure of the battery pack is referred to the above embodiments. Since the power consumption device adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0040] It can be understood that the electric device includes, but is not limited to, electric toys, electric tools, electric vehicles, automobiles, ships, spacecraft and the like. Among them, the electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys and electric plane toys and the like, and the spacecraft can include airplanes, rockets, space shuttles and spaceships and the like. The automobile can be a fuel automobile, a gas automobile and a new energy automobile.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0042] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not meant to limit the scope of the present application unless otherwise specifically stated. It is to be understood that the drawings shown in the figures are not drawn to scale for the convenience of description. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the enabling disclosure where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the example embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0043] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of the components themselves.

[0044] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device described herein relative to the other device or structure is inverted, then a spatially relative term such as "above" can be interpreted as meaning "below" or "below" can be interpreted as meaning "above". The device can also be oriented in other ways (rotated at 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The terms "first", "second", etc. as can be used herein do not have any specific meaning and are used only to distinguish one component from another.

[0045] In addition, it should be pointed out that the use of the terms "first", "second", etc. to qualify parts is only for the convenience of distinguishing the corresponding parts, and the above terms have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0046] The above only represents the preferred embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. An electric cell, characterized by, The battery cell comprises: a shell having a receiving cavity; a top cover assembly covering the shell, the top cover assembly comprising a lower plastic; a core pack arranged in the receiving cavity, a side of the core pack facing the top cover assembly having a protruding portion, a stepped structure being formed between the protruding portion and an edge of the core pack, the stepped structure having a stepped surface extending radially along the core pack, and an end of the lower plastic close to the core pack being configured to abut against the stepped surface.

2. The electric cell of claim 1, wherein, The lower plastic comprises a first plastic extending axially along the core pack and a second plastic extending radially along the core pack, and an end of the first plastic close to the core pack is configured to abut against the stepped surface.

3. The electric cell of claim 2, wherein, An extension length of the stepped surface along the radial direction of the core pack is L1, an extension length of the first plastic along the radial direction of the core pack is L2, and 0.1≤L1:L2≤1.

4. The electric cell of claim 2, wherein, A distance between a top wall of the protruding portion and a bottom wall of the second plastic along the axial direction of the core pack is L3, an extension length of the protruding portion along the axial direction of the core pack is L4, and 0.5≤L3:L4≤0.

9.

5. The electric cell of claim 4, wherein, 1mm≤L4≤4mm.

6. The electric cell of any one of claims 1-5, wherein, The top cover assembly further comprises a connecting sheet configured to electrically connect with the protruding portion, an extension length of a contact surface of the connecting sheet along the radial direction of the core pack is L5, an extension length of the protruding portion along the radial direction of the core pack is L6, and 0.4≤L5:L6≤0.

8.

7. The electric cell of claim 6, wherein, 30mm≤L6≤40mm.

8. The electric cell of claim 1, wherein, The protruding portion comprises a positive electrode tab or a negative electrode tab.

9. The electric cell of claim 1, wherein, The core pack has a radial distribution of a cutting region and an original region, the protruding portion is located in the original region, at least part of the electrode tab and / or the winding core in the cutting region is configured to be cut along the radial direction of the core pack, and an extension length of the part of the core pack located in the cutting region along the axial direction of the core pack is less than an extension length of the part of the core pack located in the original region along the axial direction of the core pack.

10. A battery module, characterized by The battery module comprises the battery cell according to any one of claims 1-9.

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