Battery shell and cylindrical battery
By incorporating a frustum structure and phase change material or heat sink within the cylindrical battery casing, the problem of low cell heat dissipation efficiency is solved, achieving rapid heat dissipation for the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-05-08
AI Technical Summary
Existing cylindrical battery cells have difficulty in effectively dissipating heat, especially due to their poor axial thermal conductivity, which makes it difficult for heat to be conducted away quickly.
Design a cylindrical battery casing with a frustum-shaped mounting chamber. The frustum is inserted into the cavity of the battery cell to increase the heat conduction area. Phase change material or heat sinks can be filled into the frustum to improve heat dissipation.
By increasing the thermal conductivity area and utilizing phase change materials or heat dissipation components, rapid heat dissipation of the battery cell is achieved, thereby improving the battery's heat dissipation efficiency.
Smart Images
Figure CN224217535U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of secondary battery technology, specifically relating to battery casing, and more particularly to a battery casing and a cylindrical battery. Background Technology
[0002] In existing cylindrical batteries, heat dissipation of the internal cells mainly relies on conducting heat from the inside to the outside of the battery casing, and finally dissipating it through the casing.
[0003] When a battery cell dissipates heat, there are two heat conduction paths: radial and axial. Although the radial path is shorter, it needs to pass through multiple layers of electrodes, and the thermal conductivity between the electrodes is poor. Although the axial path has better thermal conductivity, its conduction path length is generally several times that of the radial path, making it difficult for the heat inside the battery cell to be conducted away.
[0004] Therefore, how to enable the battery cell to dissipate heat quickly is a technical problem that urgently needs to be solved by those skilled in the art.
[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0006] This disclosure provides at least one battery casing and a cylindrical battery.
[0007] In a first aspect, embodiments of this disclosure provide a cylindrical battery, comprising: a housing body having a first mounting chamber, the bottom of the first mounting chamber having a truncated cone, the truncated cone being arranged along the axial direction of the housing body; a battery cell having a cavity at its axial center; wherein the battery cell is disposed in the first mounting chamber and the truncated cone is inserted into the cavity; and a second mounting chamber is formed in the truncated cone, the second mounting chamber being in communication with the lower surface of the housing body.
[0008] In one alternative embodiment, the second mounting chamber is filled with a phase change material; the phase change material includes graphene and alumina ceramic; wherein the mass ratio of the graphene to the alumina ceramic ranges from 1:99 to 99:1.
[0009] In one alternative embodiment, the inner wall of the second mounting chamber is provided with a threaded groove.
[0010] In one alternative embodiment, a heat sink is inserted into the second mounting cavity; wherein the heat sink is spiral; or the sidewall of the heat sink is threaded; or the heat sink is stepped; or the heat sink is conical.
[0011] In one optional embodiment, the cylindrical battery is of the following model: 18650 battery (outer diameter 18mm, height 65mm), 21700 battery (outer diameter 21mm, height 70mm), 33165 battery (outer diameter 33mm, height 165mm), 32150 battery (outer diameter 32mm, height 150mm), 32140 battery (outer diameter 32mm, height 140mm), 32135 battery (outer diameter 32mm, height 135mm), 42135 battery (outer diameter 42mm, height 42mm). 4680 battery (outer diameter 46mm, height 135mm), 4695 battery (outer diameter 46mm, height 95mm), 46120 battery (outer diameter 46mm, height 120mm), 40135 battery (outer diameter 40mm, height 135mm), 40140 battery (outer diameter 40mm, height 140mm), 46135 battery (outer diameter 46mm, height 135mm), 60130 battery (outer diameter 60mm, height 130mm), etc.
[0012] In one optional embodiment, the diameter of the cavity is R, and the bottom diameter of the frustum is R1; wherein the ratio of R1 to R ranges from 30% to 120%; and the ratio of the cavity diameter R to the battery outer diameter is between 10% and 18%.
[0013] In one optional embodiment, the diameter of the cavity is R, the diameter of the bottom surface of the frustum is R1, and the diameter of the top surface of the frustum is R2; wherein the ratio of R2 to R1 ranges from 10% to 100%, and R2 is less than R.
[0014] In one alternative embodiment, the height of the cavity is H, and the height of the frustum is L; wherein the ratio of L to H ranges from 40% to 100%.
[0015] Secondly, embodiments of this disclosure also provide a battery casing, comprising: a casing body having a first mounting chamber, the bottom of the first mounting chamber having a truncated cone having a truncated cone having a axial orientation along the casing body; wherein, a second mounting chamber is formed within the truncated cone, and the second mounting chamber communicates with the lower surface of the casing body.
[0016] In one alternative embodiment, the second mounting chamber is filled with a phase change material; the phase change material includes graphene and alumina ceramic; wherein the mass ratio of the graphene to the alumina ceramic ranges from 1:99 to 99:1.
[0017] In one optional embodiment, a heat sink is inserted into the second mounting cavity; the heat sink is spiral-shaped; or the sidewall of the heat sink is threaded; or the heat sink is stepped; or the heat sink is conical.
[0018] The beneficial effects of this utility model are that the battery casing and cylindrical battery are provided with a truncated cone, which can be inserted into the cavity of the battery cell, thereby increasing the heat conduction area and improving the heat dissipation effect; at the same time, phase change materials or heat dissipation components can be set in the truncated cone to dissipate heat even faster, and the choice is flexible.
[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.
[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0022] Figure 1 A cross-sectional structural schematic diagram of a shell body provided in an embodiment of this disclosure;
[0023] Figure 2 This is a schematic diagram of a shell body structure containing a phase change material provided in an embodiment of the present disclosure;
[0024] Figure 3 A schematic diagram of a housing body structure with a heat sink inserted, provided in an embodiment of this disclosure;
[0025] Figure 4 This is a cross-sectional view of a cylindrical battery provided in an embodiment of the present disclosure.
[0026] Figure 5 A schematic diagram of a cavity and frustum diameter provided for an embodiment of this disclosure;
[0027] Figure 6 A schematic diagram showing the height of a cavity and a frustum provided in an embodiment of this disclosure;
[0028] Figure 7This is a schematic diagram of a battery explosion structure provided in an embodiment of the present disclosure;
[0029] Figure 8 A schematic diagram of a heat sink structure with threads on the sidewalls provided in an embodiment of this disclosure;
[0030] Figure 9 A schematic diagram of a stepped heat sink structure provided in an embodiment of this disclosure;
[0031] Figure 10 This is a schematic diagram of a conical heat sink structure provided in an embodiment of the present disclosure;
[0032] Figure 11 A schematic diagram of a spiral-shaped heat sink structure provided in an embodiment of this disclosure;
[0033] Figure 12 This is a schematic diagram of the structure of the inner wall of a second mounting cavity provided in an embodiment of this disclosure.
[0034] In the picture:
[0035] Outer shell 1, first mounting chamber 11;
[0036] Conical truncated pyramid 2, second mounting chamber 21;
[0037] Heat sink 3;
[0038] Cell 4, cavity 41;
[0039] Phase change materials 5;
[0040] The diameter of the cavity is R, the diameter of the bottom surface of the frustum is R1, the diameter of the top surface of the frustum is R2, the diameter of the outer shell body is R3, the height of the cavity is H, and the height of the frustum is L.
[0041] 6. Cap, 7. Positive collector disk, 8. Negative collector disk. Detailed Implementation
[0042] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0043] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.
[0044] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0045] like Figure 1 As shown, at least one embodiment provides a battery casing, including: a casing body 1 and a cone 2, the casing body 1 is provided with a first mounting chamber 11, the cone 2 is located at the bottom of the mounting chamber 11 and is arranged along the axial direction of the casing body 1; wherein, a second mounting chamber 21 is formed inside the cone 2.
[0046] In this embodiment, the battery cell 4 is installed in the first mounting chamber 11. Since the battery cell 4 is formed by winding, there is a cavity 41 at the axis. Therefore, the cone 2 in this embodiment can be inserted into the cavity 41 of the battery cell 4, thereby increasing the heat dissipation area of the battery and shortening the heat conduction path of the battery cell 4.
[0047] In some embodiments, the cone 2 may be formed by stamping the bottom surface of the housing body 1 using a stamping device.
[0048] In some embodiments, the cone 2 may be welded to the bottom of the housing body 1.
[0049] In some embodiments, the second mounting chamber 21 is in communication with the lower surface of the housing body 1.
[0050] like Figure 12 As shown, in some embodiments, the inner wall of the second mounting chamber 21 is provided with threaded grooves.
[0051] In one application scenario, such as Figure 1 As shown, the bottom surface of the cone 2 is not sealed, which means that the heat dissipation area inside the cell 4 is directly increased, thereby achieving the effect of reducing the battery temperature.
[0052] In another application scenario, such as Figure 2 As shown, the second mounting chamber 21 is filled with phase change material 5, and then the second mounting chamber 21 is sealed. The temperature of the battery cell 4 is controlled by the phase change material 5. The phase change material 5 is a mixture of graphene and alumina ceramic, and the mass ratio of graphene to alumina ceramic is in the range of 1:99 to 99:1.
[0053] In another application scenario, such as Figure 3 As shown, a heat sink 3 is inserted in the second mounting chamber 21. The heat sink 3 may, but is not limited to, using liquid cooling.
[0054] like Figure 8 As shown, in some embodiments, the sidewall of the heat sink 3 is provided with threads.
[0055] like Figure 9 As shown, in some embodiments, the heat sink 3 is stepped.
[0056] like Figure 10 As shown, in some embodiments, the heat sink 3 is in the shape of a cone.
[0057] like Figure 11 As shown, in some embodiments, the heat sink 3 is spiral-shaped.
[0058] like Figure 4 As shown, at least one embodiment also provides a cylindrical battery, including: a battery casing 1 and a battery cell 4, wherein a cavity 41 is provided at the axis of the battery cell 4, and when the battery cell 4 is installed in the first mounting chamber 11, the cone 2 of the battery casing is inserted into the cavity 41.
[0059] like Figure 5 As shown, in some embodiments, the diameter of the cavity 41 is R, and the diameter of the bottom surface of the frustum 2 is R1; wherein the ratio of R1 to R ranges from 30% to 120%.
[0060] like Figure 5 As shown, in some embodiments, the diameter of the cavity 41 is R, the diameter of the bottom surface of the frustum 2 is R1, and the diameter of the top surface of the frustum 2 is R2; wherein the ratio of R2 to R1 ranges from 10% to 100%, and R2 is less than R.
[0061] like Figure 4 As shown, in some embodiments, the diameter of the cavity 41 is R, the diameter of the outer shell body 1 is R3, and the ratio of R to R3 ranges from 10% to 18%.
[0062] like Figure 6 As shown, in some embodiments, the height of cavity 41 is H, and the height of frustum 2 is L; wherein the ratio of L to H ranges from 40% to 100%.
[0063] like Figure 7 As shown, in some embodiments, the cylindrical battery includes: a cap 6, a positive current collector 7, and a negative current collector 8.
[0064] In some embodiments, the cylindrical battery may be of the following models: 18650 battery (outer diameter 18mm, height 65mm), 21700 battery (outer diameter 21mm, height 70mm), 33165 battery (outer diameter 33mm, height 165mm), 32150 battery (outer diameter 32mm, height 150mm), 32140 battery (outer diameter 32mm, height 140mm), 32135 battery (outer diameter 32mm, height 135mm), or 42135 battery (outer diameter 42mm). The following batteries are available: 4680 (outer diameter 46mm, height 80mm), 4695 (outer diameter 46mm, height 95mm), 46120 (outer diameter 46mm, height 120mm), 40135 (outer diameter 40mm, height 135mm), 40140 (outer diameter 40mm, height 140mm), 46135 (outer diameter 46mm, height 135mm), and 60130 (outer diameter 60mm, height 130mm).
[0065] For details regarding the specific structure and implementation process of the battery casing, please refer to the relevant discussions in the above embodiments, which will not be repeated here.
[0066] In summary, by setting a cone 2 in the battery casing and cylindrical battery, the cone 2 can be inserted into the cavity 41 of the cell 4, thereby increasing the heat conduction area and improving the heat dissipation effect; at the same time, phase change material 5 or heat sink 3 can be set in the cone 2 to dissipate heat even faster, and the choice is flexible.
[0067] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.
[0068] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0069] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0070] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0071] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0072] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0073] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.
[0074] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0075] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0076] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A cylindrical battery, characterized in that, include: The outer shell body (1) is provided with a first mounting chamber (11), and a cone (2) is provided at the bottom of the first mounting chamber (11), and the cone (2) is arranged along the axial direction of the outer shell body (1); The battery cell (4) has a cavity (41) at its axis; wherein The battery cell (4) is disposed within the first mounting chamber (11), and the frustum (2) is inserted into the cavity (41); and The cone (2) has a second mounting chamber (21) inside, and the second mounting chamber (21) is connected to the lower surface of the outer shell body (1).
2. The cylindrical battery as described in claim 1, characterized in that, The second installation chamber (21) is filled with phase change material (5); The phase change material (5) includes: graphene and alumina ceramic; wherein The ratio of the mass of the graphene to the mass of the alumina ceramic is in the range of 1:99 to 99:
1.
3. The cylindrical battery as described in claim 1, characterized in that, The inner wall of the second installation chamber (21) is provided with a threaded groove.
4. The cylindrical battery as described in claim 1, characterized in that, A heat sink (3) is inserted into the second mounting chamber (21); wherein The heat sink (3) is spiral-shaped; or The heat sink (3) has threads on its sidewall; or The heat sink (3) is stepped; or The heat sink (3) is conical.
5. The cylindrical battery as described in claim 1, characterized in that, The diameter of the cavity (41) is R, the diameter of the bottom surface of the frustum (2) is R1, and the diameter of the outer shell body (1) is R3; wherein The ratio of R1 to R ranges from 30% to 120%. The ratio of R to R3 ranges from 10% to 18%.
6. The cylindrical battery as described in claim 1, characterized in that, The diameter of the cavity (41) is R, the diameter of the bottom surface of the frustum (2) is R1, and the diameter of the top surface of the frustum (2) is R2; wherein The ratio of R2 to R1 ranges from 10% to 100%, and R2 is less than R.
7. The cylindrical battery as described in claim 1, characterized in that, The height of the cavity (41) is H, and the height of the frustum (2) is L; wherein The ratio of L to H ranges from 40% to 100%.
8. A battery casing, characterized in that, include: The outer shell body (1) is provided with a first mounting chamber (11), and a cone (2) is provided at the bottom of the first mounting chamber (11), and the cone (2) is arranged along the axial direction of the outer shell body (1); The cone (2) has a second mounting chamber (21) inside, and the second mounting chamber (21) is connected to the lower surface of the outer shell body (1).
9. The battery casing as described in claim 8, characterized in that, The second installation chamber (21) is filled with phase change material (5); The phase change material (5) includes: graphene and alumina ceramic; wherein The ratio of the mass of the graphene to the mass of the alumina ceramic is in the range of 1:99 to 99:
1.
10. The battery casing as described in claim 8, characterized in that, A heat sink (3) is inserted into the second mounting chamber (21); The heat sink (3) is spiral-shaped; or The heat sink (3) has threads on its sidewall; or The heat sink (3) is stepped; or The heat sink (3) is conical.