Shell structure and battery cell assembly with same
By incorporating alternating concave and convex reinforcing structures on the lithium-ion battery casing, the problem of insufficient casing strength is solved, achieving lightweight and efficient heat dissipation, and reducing production costs.
Patent Information
- Application Number
- CN202423188143.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In the pursuit of lightweighting, existing lithium-ion battery cell casings suffer from insufficient strength, leading to problems such as casing expansion and insufficient welding strength. Furthermore, existing reinforcement measures have increased weight and cost.
The sidewall of the battery cell housing structure is provided with alternating concave and convex reinforcing structures, including concave reinforcing structures and convex reinforcing structures, which extend circumferentially along the receiving cavity and are integrally formed with the housing body to form multiple reinforcing ribs.
It significantly improves the structural strength and thermal conductivity of the casing, avoids additional weight increase, reduces costs, and improves the reliability and heat dissipation efficiency of the battery cell without adding heat dissipation components.
Smart Images
Figure CN223898435U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lithium ion battery technical field, specifically, relate to a kind of shell structure and the electric core with it. BACKGROUND
[0002] Lithium ion battery has the advantages of high energy density, high working voltage, small self-discharge, no memory effect, long cycle life, fast charging, light weight, small size, no pollution, etc., and is widely used in consumer electronics, new energy vehicles, energy storage and other fields. With the development of lithium ion battery technology, the requirement for battery energy density is higher and higher, and the electric core shell gradually develops in the direction of lightweight. The electric core shell is generally made of aluminum, which has great advantages in weight, heat dissipation and corrosion resistance. To improve the energy density of single electric core, the thickness of the electric core shell is continuously reduced, and the strength of the shell is also reduced, which leads to the risk of shell expansion and insufficient welding strength.
[0003] In the prior art, a support sheet or a protective sheet is usually introduced on the surface of the electric core shell, or a back-shaped frame reinforcing structure is arranged on the peripheral surface of the electric core to strengthen the electric core shell structure. However, there are problems of large overall weight and high manufacturing cost when improving the mechanical properties and compression strength of the electric core shell.
[0004] At present, there is no effective solution to the above problems. UTILITY MODEL CONTENTS
[0005] The main purpose of the utility model is to provide a shell structure and an electric core assembly with the same, to solve or improve the problem that the strength performance and lightweight of the electric core shell cannot be compatible in the prior art.
[0006] In order to achieve the above purpose, according to one aspect of the utility model, a shell structure is provided, which comprises: a shell body, the shell body has a containing cavity with one end open, the containing cavity is used for containing an electric core body, at least part of the side wall of the containing cavity is provided with at least one reinforcing structure, the reinforcing structure comprises an inner concave reinforcing structure and an outer convex reinforcing structure, wherein the inner concave reinforcing structure is protrudingly arranged towards the geometric center of the containing cavity, and the outer convex reinforcing structure is protrudingly arranged towards the direction away from the geometric center of the containing cavity.
[0007] Further, the reinforcing structure extends along the circumference of the containing cavity.
[0008] Further, the reinforcing structure comprises at least one inner concave reinforcing structure and at least one outer convex reinforcing structure, and the inner concave reinforcing structure and the outer convex reinforcing structure are alternately arranged along the height direction of the containing cavity.
[0009] Further, the reinforcing structure is a plurality of reinforcing structures, and the plurality of reinforcing structures are arranged at intervals along the height direction of the containing cavity.
[0010] Further, the plurality of reinforcing structures at least include a first reinforcing structure and a second reinforcing structure arranged adjacently, the inner concave reinforcing structure and the outer convex reinforcing structure of the first reinforcing structure are arranged in a first arrangement order, and the inner concave reinforcing structure and the outer convex reinforcing structure of the second reinforcing structure are arranged in a second arrangement order, wherein the first arrangement order is different from the second arrangement order.
[0011] Further, the at least one reinforcing structure is arranged close to the opening end of the accommodating cavity, and / or the at least one reinforcing structure is arranged close to the bottom of the accommodating cavity.
[0012] Further, the reinforcing structure is a reinforcing rib.
[0013] Further, the reinforcing structure is integrally formed with the shell body, and one side surface of the reinforcing structure forms part of the side wall of the accommodating cavity.
[0014] In order to achieve the above-mentioned purpose, according to one aspect of the technical scheme of the present application, an electric core assembly is provided, which comprises at least one electric core, and the electric core has a shell structure, and the shell structure is the above-mentioned shell structure.
[0015] Further, the electric core assembly comprises a plurality of electric cores, and the outer convex reinforcing structures of two adjacent shell structures are arranged in abutment to form a heat dissipation channel between the two adjacent electric cores.
[0016] The technical scheme of the present application has the following beneficial effects: by arranging the reinforcing structure on the side wall of the shell structure, the structural strength of the shell body is significantly improved, deformation of the shell body under external pressure is effectively prevented, and the large weight structure of the traditional electric core shell introduced support sheet or protection sheet is avoided, so that the shell body is more lightweight and the cost is reduced; the inner concave reinforcing structure can improve the mechanical strength and heat conduction performance of the electric core body, and the outer convex reinforcing structure provides an expansion space for the expansion of the electric core body, thereby improving the reliability of the electric core. BRIEF DESCRIPTION OF DRAWINGS
[0017] The drawings accompanying the specification of the present application form a part of the present application and serve to provide a further understanding of the present application, the illustrative embodiments of the present application and the explanations thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:
[0018] Fig. 1 A structural schematic view of a first embodiment of a shell structure according to the present application is shown;
[0019] Fig. 2 A structural schematic view of a second embodiment of a shell structure according to the present application is shown;
[0020] Fig. 3 A structural schematic view of a third embodiment of a shell structure according to the present application is shown.
[0021] In the above drawings, reference numerals:
[0022] 10, housing body; 100, accommodation cavity; 11, reinforcing structure; 111, inner concave reinforcing structure; 112, outer convex reinforcing structure. DETAILED DESCRIPTION
[0023] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0024] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it will be further understood that the terms "comprise" and / or "include" when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof.
[0025] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0026] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in various different forms, and should not be interpreted as being limited only to the embodiments set forth herein. It should be understood that these embodiments are provided in order to make the present disclosure complete and comprehensive, and to adequately convey the ideas of these exemplary embodiments to those of ordinary skill in the art. In the drawings, the thickness of layers and regions can be exaggerated for clarity, and the same reference numerals are used to denote the same elements, so that a description thereof will be omitted.
[0027] In combination Figs. 1-3 As shown, according to specific embodiments of the present application, a housing structure is provided.
[0028] Specifically, asFig. 1 As shown, the shell structure includes a shell body 10, the shell body 10 has an open-ended receiving cavity 100 for accommodating the battery body, at least part of the side wall of the receiving cavity 100 is provided with at least one reinforcing structure 11, the reinforcing structure 11 includes an inner concave reinforcing structure 111 and an outer convex reinforcing structure 112, wherein the inner concave reinforcing structure 111 is provided protruding towards the geometric center of the receiving cavity 100, and the outer convex reinforcing structure 112 is provided protruding towards the direction away from the geometric center of the receiving cavity 100.
[0029] The technical scheme of the embodiment is applied, the reinforcing structure 11 is arranged on the side wall of the shell structure, the structural strength of the shell body 10 is significantly improved, the deformation of the shell body 10 under external pressure is effectively prevented, and the large weight structure of the traditional battery shell introduced by the support sheet or the protection sheet is avoided, so that the shell body 10 is more lightweight and the cost is reduced; the inner concave reinforcing structure 111 is adopted to improve the mechanical strength and heat conduction performance of the battery body, and the outer convex reinforcing structure 112 provides an expansion space for the expansion of the battery body, thereby improving the reliability of the battery.
[0030] Specifically, as shown in Fig. 2 , Fig. 3 The reinforcing structure 11 extends along the circumference of the receiving cavity 100. By arranging the reinforcing structure 11 along the circumference, the shell body 10 can uniformly distribute the stress in all directions, enhance the hoop strength of the shell body 10, improve the ability of the shell body 10 to resist torsion, make the shell body 10 more stable when subjected to lateral pressure or torsional force, reduce the internal stress of the shell body 10 and the battery body, and prolong the service life of the battery.
[0031] Further, the reinforcing structure 11 includes at least one inner concave reinforcing structure 111 and at least one outer convex reinforcing structure 112, which are arranged alternately along the height direction of the receiving cavity 100. The reinforcing structure 11 forms a support point on the surface of the shell body 10 by arranging the outer convex reinforcing structure 112, increases the rigidity of the shell, resists external pressure, and prevents the shell body 10 from deforming. The inner concave reinforcing structure 111 forms a reinforcing point on the inside of the shell body 10, which can increase the internal support force of the shell. The inner concave reinforcing structure 111 and the outer convex reinforcing structure 112 are arranged alternately, which can improve the mechanical properties and compression strength of the shell body 10 as a whole. At the same time, the alternating structure of the inner concave and the outer convex increases the surface area of the shell body 10, which helps to improve the heat dissipation efficiency of the battery.
[0032] It should be noted that the opening end of the shell body 10 is a flat surface, the height direction of the accommodating cavity 100 is perpendicular to the direction of the opening end of the shell body 10, and the reinforcing structure 11 is arranged on the side wall of the shell body 10 along the circumferential direction of the accommodating cavity 100. When the side walls of the plurality of shell bodies 10 are arranged adjacent to each other, the mutual extrusion between the shell bodies 10 can be prevented, so that the deformation of the shell body 10 and the battery body is prevented.
[0033] Further, the reinforcing structure 11 is a plurality of reinforcing structures 11, and the plurality of reinforcing structures 11 are arranged at intervals along the height direction of the accommodating cavity 100. By arranging a plurality of reinforcing structures 11 on the side wall of the shell body 10 and arranging the reinforcing structures 11 at different height positions of the side wall, the pressure received by the shell body 10 can be effectively dispersed, and the direct impact received by the battery body can be reduced. The impact and vibration encountered by the battery during transportation, installation and operation are reduced, and the safety of the battery is protected.
[0034] Specifically, the plurality of reinforcing structures 11 at least include a first reinforcing structure and a second reinforcing structure arranged adjacent to each other, the inner concave reinforcing structure 111 and the outer convex reinforcing structure 112 of the first reinforcing structure are arranged in a first arrangement sequence, the inner concave reinforcing structure 111 and the outer convex reinforcing structure 112 of the second reinforcing structure are arranged in a second arrangement sequence, and the first arrangement sequence and the second arrangement sequence are different. By arranging the reinforcing structures 11 at different height positions of the side wall of the shell body 10, the reinforcing structures 11 at different height positions can form reinforcing structures 11 with different effects by arranging the outer convex reinforcing structure 112 and the inner concave reinforcing structure 111 adjacent to each other in different arrangement sequences, so that the structural strength of the shell body 10 has different characteristics, and the shell body 10 is reinforced in a specific direction and position of the battery body.
[0035] It should be noted that the first arrangement sequence and the second arrangement sequence are pre-arranged sequences, which can be adjusted according to the material characteristics and position of different battery bodies during arrangement. For example, the inner concave reinforcing structure 111 of the shell body 10 is arranged at the thinned area or weak position of the battery body, and the outer convex reinforcing structure 112 is arranged at the position where the battery body is prone to expand. The inner concave reinforcing structure 111 and the outer convex reinforcing structure 112 can be arranged in different arrangement sequences to reinforce the thinned area of the battery body.
[0036] Further, at least one reinforcing structure 11 is arranged close to the opening end of the accommodating cavity 100, and / or at least one reinforcing structure 11 is arranged close to the bottom of the accommodating cavity 100. In this way, the stability of the shell body 10 during installation and disassembly of the battery body can be enhanced, and the reinforcing structure 11 arranged close to the bottom of the accommodating cavity 100 can effectively support the weight of the battery body, prevent the deformation of the shell body 10 after long-term use, and ensure the stability and reliability of the shell body 10.
[0037] In an embodiment of the present application, as shown inFigs. 1-3 As shown, the housing body 10 has a first reinforcing structure near the opening end of the receiving cavity 100 and a second reinforcing structure near the bottom end of the receiving cavity 100. Both the first and second reinforcing structures are composed of a concave reinforcing structure 111 and a convex reinforcing structure 112. Specifically, the side of the first reinforcing structure near the opening is the convex reinforcing structure 112, and adjacent to it is the concave reinforcing structure 111; the side of the second reinforcing structure near the bottom end is the convex reinforcing structure 112, and adjacent to it is the concave reinforcing structure 111. This improves the mechanical properties of the cell body, increases the interface contact in the thinned area of the cell electrode, and improves the cell interface.
[0038] It should be noted that the reinforcing structure 11 is close to the opening end of the receiving cavity 100, or the reinforcing structure 11 is close to the bottom end of the receiving cavity 100, but at a certain distance from the opening end or the bottom end, so as to avoid the reinforcing structure from contacting the positive electrode of the cell, thereby causing the cell electrode to be squeezed and deformed, resulting in lithium plating of the cell.
[0039] Optionally, the reinforcing structure 11 is a reinforcing rib. The reinforcing rib can effectively improve the rigidity of the housing body 10, reduce the deformation of the housing body 10 under external pressure, and protect the internal battery cell body from damage.
[0040] Optionally, the reinforcing ribs may be arranged continuously, side by side, at intervals, or in a cross-shaped mesh.
[0041] Furthermore, the reinforcing structure 11 is integrally formed with the housing body 10, and one side of the reinforcing structure 11 forms the sidewall of the receiving cavity 100. This integral forming method simplifies the manufacturing process of the housing body 10, reduces production costs, and ensures the connection strength between the reinforcing structure 11 and the housing body 10. Depending on the specific design of different housing bodies 10, the reinforcing structure 11 is integrally formed with multiple sides, thus directly integrating the reinforcing structure 11 onto the side of the housing body 10.
[0042] Optionally, the reinforcing structure 11 is integrally formed on the large surface of the housing body 10 by processes such as rolling or stamping. The surface of the reinforcing structure 11 can be provided with irregularly shaped stripes by rolling or stamping processes to increase the surface area of the reinforcing structure 11. At the same time, it can increase the friction between adjacent housing bodies 10 and avoid sliding collisions between adjacent cells.
[0043] According to another specific embodiment of this application, a battery cell assembly is provided, comprising at least one battery cell. The battery cell has a housing structure, which is the housing structure described in the above embodiment. The battery cell includes a housing body 10 and a cell body, and multiple battery cells form a battery cell assembly. By employing the aforementioned housing structure in the housing body 10, not only is higher safety provided, but heat dissipation performance is also improved through the design of the housing structure itself without adding additional heat dissipation components.
[0044] Specifically, the electric cell assembly includes a plurality of electric cells, and the outer convex reinforcing structures 112 of two adjacent shell structures are arranged in abutment to form a heat dissipation channel between the two adjacent electric cells. By abutting the outer convex reinforcing structures 112 between the shell structures of adjacent electric cells, the electric cells can be closely arranged to improve the space utilization of the battery pack, and a continuous heat dissipation path is formed to accelerate the conduction of heat energy from the electric cells to the environment, which can effectively control the battery temperature and avoid performance degradation or safety hazards caused by overheating.
[0045] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:
[0046] 1) Only by setting the reinforcing structures of outer convex and inner concave on the shell structure, the use of additional supporting sheets is avoided, the structure is simple, the cost is low, and it can be widely applied to the production and manufacturing of hard-shell batteries.
[0047] 2) By increasing the reinforcing structure 11 on the opening part of the shell body 10, the mechanical properties and compression strength of the electric cell shell are effectively improved, and when the shell is subjected to external force, the reinforcing structure 11 can effectively disperse and resist external force to prevent the shell from deforming or breaking.
[0048] 3) The outer convex reinforcing structure 112 can replace the traditional meander frame structure, reserve enough space for the expansion of the electric cell in the life cycle, reduce the overall package weight, and reduce the overall package cost.
[0049] 4) The inner concave reinforcing structure 111 can increase the interface contact of the thinned area of the electric cell pole piece, improve the electric cell interface, and improve the performance of the electric cell.
[0050] 5) The shell structure can increase the effective heat dissipation area of the electric cell and improve the performance of the electric cell.
[0051] 6) The shell structure can be designed as a square shell, a cylindrical shell, and other different types of hard-shell batteries, and the structure design flexibility is high, which is helpful for the development of lightweight electric cells.
[0052] The application also provides a preferred embodiment of a shell structure for an electric cell assembly in a vehicle battery pack, which increases the reinforcing structure 11 at the opening of the shell structure by stamping or rolling the shell structure, effectively improving the mechanical properties and compression strength of the shell structure.
[0053] The shell structure is mainly composed of a side surface, a bottom and an opening, wherein the side surface is provided with reinforcing structures 11, the reinforcing structures 11 can be integrally formed with the shell structure by stamping or rolling to reinforce the shell structure, the reinforcing structures 11 are multiple, the multiple reinforcing structures 11 are respectively arranged close to the opening and / or close to the bottom, the reinforcing structures 11 include outward convex reinforcing structures 112 and inward concave reinforcing structures 111. The outward convex reinforcing structures 112 can cancel the traditional meander frame structure, reserve sufficient space for the cell expansion in the life cycle of the whole vehicle, reduce the weight of the whole package and reduce the cost of the whole package; the inward concave reinforcing structures 111 can increase the interface contact of the thinned area of the cell pole piece, improve the cell interface and improve the cell performance.
[0054] The cell can be one of a square shell cell or a cylindrical cell, the reinforcing structure 11 is a reinforcing rib, the reinforcing rib can be continuously, side by side, spaced or net-like intersected arranged on the large surface of the shell body 10, the surface of the reinforcing structure 11 can be a regular shape of a strip, a triangle, a rhombus, a rectangle, a corrugated shape or an oblique line, or can be an irregular shape, so as to increase the surface area and the friction force between the adjacent cells.
[0055] For the convenience of description, spatial relative terms such as "above", "upper", "on", "top", etc. can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" 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 spatial relative descriptions used herein are interpreted accordingly.
[0056] In addition to the above, it should also be noted that "one embodiment", "another embodiment", "embodiment" and the like mentioned in the specification refer to specific features, structures or characteristics described in connection with the embodiment, which are included in at least one embodiment described in the general description of the application. The same description appears in several places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in connection with any embodiment, it is claimed that the implementation of such feature, structure or characteristic in connection with other embodiments also falls within the scope of the present application.
[0057] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.
[0058] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A shell structure, characterized in that, include: The housing body (10) has a receiving cavity (100) with one end open, the receiving cavity (100) for receiving the battery cell body, and at least a portion of the sidewall of the receiving cavity (100) is provided with at least one reinforcing structure (11), the reinforcing structure (11) including a concave reinforcing structure (111) and a convex reinforcing structure (112), wherein the concave reinforcing structure (111) protrudes toward the geometric center of the receiving cavity (100), and the convex reinforcing structure (112) protrudes toward a direction away from the geometric center of the receiving cavity (100).
2. The shell structure according to claim 1, characterized in that, The reinforcing structure (11) extends circumferentially along the receiving cavity (100).
3. The shell structure according to claim 1 or 2, characterized in that, The reinforcing structure (11) includes at least one concave reinforcing structure (111) and at least one convex reinforcing structure (112), and the concave reinforcing structure (111) and the convex reinforcing structure (112) are alternately arranged along the height direction of the receiving cavity (100).
4. The shell structure according to claim 3, characterized in that, There are multiple reinforcing structures (11), and the multiple reinforcing structures (11) are spaced apart along the height direction of the receiving cavity (100).
5. The shell structure according to claim 4, characterized in that, The plurality of reinforcing structures include at least a first reinforcing structure and a second reinforcing structure arranged adjacent to each other. The concave reinforcing structure (111) and the convex reinforcing structure (112) of the first reinforcing structure are arranged in a first arrangement order, and the concave reinforcing structure (111) and the convex reinforcing structure (112) of the second reinforcing structure are arranged in a second arrangement order, wherein the first arrangement order and the second arrangement order are different.
6. The shell structure according to claim 4, characterized in that, At least one of the reinforcing structures (11) is disposed near the opening end of the receiving cavity (100), and / or at least one of the reinforcing structures (11) is disposed near the bottom of the receiving cavity (100).
7. The shell structure according to any one of claims 1 to 5, characterized in that, The reinforcing structure (11) is a reinforcing rib.
8. The shell structure according to any one of claims 1 to 5, characterized in that, The reinforcing structure (11) is integrally formed with the housing body (10), and one side of the reinforcing structure (11) forms part of the sidewall of the receiving cavity (100).
9. A battery cell assembly, characterized in that, The battery cell assembly includes at least one battery cell, the battery cell having a housing structure, the housing structure being the housing structure described in any one of claims 1-8.
10. The cell assembly according to claim 9, characterized in that, The battery cell assembly includes a plurality of battery cells, and the protruding reinforcing structures (112) of two adjacent housing structures are abutted to form a heat dissipation channel between the two adjacent battery cells.