Battery and center tube assembly for battery cell
By combining a flexible buffer with a central tube, the problem of damage to the rigid central tube during the charging and discharging process of the battery cell is solved, achieving dynamic adaptation and performance improvement of the battery cell, and optimizing electrolyte distribution and thermal management.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-24
AI Technical Summary
In the prior art, the rigid central tube may be damaged or gapped due to expansion or contraction and compression of the battery cell during the charging and discharging process, which reduces the support strength and poses a risk of collapse.
A flexible and expandable buffer component is combined with a central tube. The buffer component expands after being soaked in electrolyte to fit the inner wall of the central hole of the battery cell. Ribs with exhaust channels are set to accommodate the expansion and contraction of the battery cell. Combined with a central tube made of aluminum alloy or high-elasticity titanium alloy, the electrolyte distribution and thermal management are optimized.
It does not damage the battery cell during insertion, dynamically adapts to the expansion and contraction of the battery cell, improves support strength and battery performance, optimizes electrolyte distribution and thermal management, reduces battery polarization, and improves rate performance.
Smart Images
Figure CN224554357U_ABST
Abstract
Description
Technical Field
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[0001] The utility model belongs to the technical field of batteries, specifically relates to secondary batteries, and particularly relates to a central tube assembly for a battery cell and a battery. Background Art
[0002] The battery cell of a battery is formed by winding a plurality of electrode plates, and a central hole is formed in the center. This makes the central hole of the battery cell have a greater risk of collapse during the use of the battery.
[0003] In the related art, a rigid central tube is generally inserted into the central hole of the battery cell to support the battery cell; however, after the rigid central tube is inserted into the central hole of the battery cell, due to the expansion or contraction of the battery cell during charging and discharging, it will cause damage due to extrusion with the central tube or generate a gap with the central tube, resulting in a reduction in the support strength.
[0004] Therefore, how to solve the above problems is an urgent need for those skilled in the art. <(
[0005] It should be noted that the above information disclosed in this background art part is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Utility Model
[0006] The embodiments of this disclosure at least provide a central tube assembly for a battery cell and a battery. [
[0007] In a first aspect, the embodiments of this disclosure provide a central tube assembly for a battery cell, including: a central tube; at least one support member connected to the corresponding end of the central tube; a buffer member sleeved on the central tube and adapted to be disposed in the central hole of the battery cell together with the central tube; wherein at least one rib is provided on the side wall of the buffer member and is adapted to form an exhaust passage; the buffer member expands after being infiltrated with electrolyte so that the rib abuts against the inner wall of the central hole.
[0008] In an optional embodiment, at least three ribs are arranged along the axial direction of the buffer member to form at least three linear exhaust passages, so that the ribs axially abut against the inner wall of the central hole.
[0009] In an optional embodiment, at least one rib is arranged in a spiral shape to form at least one spiral exhaust passage, so that the rib abuts against the inner wall of the central hole in a hierarchical manner.
[0010] In an optional embodiment, in the exhaust passage, the ribs are evenly distributed to approximately form a "rice" shape or a "Y" shape or a "cross" shape.
[0011] In one alternative embodiment, the helix angle of the rib in the exhaust channel ranges from 0 to 70°; and / or, the pitch of the rib in the exhaust channel ranges from 1.5 to 10 mm.
[0012] In one optional embodiment, the central tube is made of aluminum alloy or high-elasticity titanium alloy; and / or, the cross-section of the central tube is circular or elliptical, and a hollow cavity is formed inside the central tube, the hollow cavity being filled with a phase change heat-absorbing material.
[0013] In one alternative embodiment, in a circular cross-section of the central tube, the inner diameter D of the hollow cavity ranges from 0.3 to 1 mm; and / or, in a circular cross-section of the central tube, the wall thickness H of the hollow cavity ranges from 0.2 to 2.5 mm.
[0014] In one optional embodiment, the sidewall of the central tube is provided with a group of through holes, which are arranged in layers to form an upper group of holes, a middle group of holes, and a lower group of holes; the pore density of the upper group of holes is P1, the pore density of the lower group of holes is P2, the pore density of the middle group of holes is P3, the diameter of the through holes in the upper group of holes is d1, the diameter of the through holes in the lower group of holes is d2, and the diameter of the through holes in the middle group of holes is d3; wherein the upper group of holes, the middle group of holes, and the lower group of holes satisfy d1=d2=d3, and P1≈P2<P3; or the upper group of holes, the middle group of holes, and the lower group of holes satisfy P1=P2=P3, and d1≈d2<d3.
[0015] In one optional embodiment, the sidewall of the buffer member is provided with a plurality of immersion holes, each of the immersion holes being located on a rib, and at least some of the immersion holes coinciding with the through holes in the through hole group; and / or, the through holes in the through hole group are arranged radially along the central tube, and their cross-sectional area ranges from 1 to 3 mm2; and / or, the ratio of the total cross-sectional area of all through holes in the through hole group to the surface area of the central tube is >30%.
[0016] Secondly, this disclosure also provides a battery, including: a cell with a central hole at its axis; a central tube assembly; wherein the central tube of the central tube assembly and a buffer are disposed together within the central hole of the cell.
[0017] The beneficial effect of this utility model is that the central tube assembly for the battery cell and the battery adopt a flexible and expandable buffer, which not only prevents damage to the battery cell during insertion, but also dynamically fits the inner wall of the central hole after expansion, so as to adapt to the expansion and contraction of the battery cell during charging and discharging.
[0018] 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.
[0019] 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
[0020] 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.
[0021] Figure 1 This is a schematic diagram of the structure of a central tube and a support member provided in an embodiment of the present disclosure; Figure 2 A top view of a central tube assembly located within a battery cell, provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of a spiral exhaust channel provided in an embodiment of the present disclosure; Figure 4 A schematic diagram of the mounting structure of a central tube assembly and a battery cell provided in an embodiment of this disclosure; Figure 5 A schematic diagram of the dimensions of a hollow cavity provided in an embodiment of this disclosure; Figure 6 A schematic diagram of the pore density of each layer in a through-hole group provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of the structure of an immersion hole provided in an embodiment of the present disclosure.
[0022] In the picture: Central tube 1, hollow chamber 11, through hole group 12, through hole 120, upper hole group 121, middle hole group 122, lower hole group 123, airway 13; Support component 2; Buffer component 3, rib 31, venting channel 32a / 32b, liquid immersion hole 33; Cell 4, center hole 41. Detailed Implementation
[0023] 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.
[0024] 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.
[0025] 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.
[0026] like Figures 1 to 4 As shown, at least one embodiment provides a central tube assembly for a battery cell, including: a central tube 1; at least one support member 2 connected to a corresponding end of the central tube 1; and a buffer member 3 sleeved on the central tube 1, adapted to be disposed together with the central tube 1 in the central hole 41 of the battery cell 4; wherein the side wall of the buffer member 3 is provided with at least one rib 31 adapted to form venting channels 32a, 32b; the buffer member 3 expands after being immersed in electrolyte so that the rib 31 abuts against the inner wall of the central hole 41.
[0027] Specifically, during installation, the buffer 3 is in a dry state, and its outer diameter is smaller than the inner diameter of the central hole 41, so as to avoid deformation of the battery cell 4 due to expansion force during insertion; when the buffer 3 is soaked in electrolyte, the buffer 3 expands and abuts against the inner wall of the central hole 41 through the ribs 31 to achieve a supporting function.
[0028] In this embodiment, by using a flexible and expandable buffer 3, not only can the battery cell 4 not be damaged during insertion, but it can also dynamically fit the inner wall of the central hole 41 after expansion, so as to adapt to the expansion and contraction of the battery cell 4 during charging and discharging.
[0029] Optionally, the central tube 1 and the support member 2 adopt a plug-in structure.
[0030] In one application scenario, such as Figure 2 As shown, at least three ribs 31 are arranged along the axial direction of the buffer 3 to form at least three straight exhaust channels 32a, so that the ribs 31 abut against the inner wall of the central hole 41 in the axial direction; wherein, when gas or heat is generated in the battery cell, the gas or heat can be discharged from the exhaust channel 32a.
[0031] In another application scenario, such as Figure 3 shown, at least one rib 31 is arranged in a spiral shape to form at least one spiral exhaust channel 32b, so that the rib 31 and the inner wall of the central hole 41 form a hierarchical contact; wherein, when gas or heat is generated inside the battery cell, the gas or heat can be discharged from the exhaust channel 32b; at the same time, the exhaust channel 32b can guide the flow of the electrolyte and the directional discharge of gas, optimize the electrolyte distribution path, reduce the ionic transport resistance, reduce the battery polarization, and improve the rate performance.
[0032] Such as Figure 2 shown, in some embodiments, in the exhaust channel 32a, the ribs 31 are evenly distributed to approximately form a "rice" shape or a "Y" shape or a "cross" shape.
[0033] In some embodiments, the material of the central tube 1 is an aluminum alloy material or a high-elastic titanium alloy material, which has a higher anti-bending ability compared to traditional PP / PE plastics. <0000^093>In some embodiments, in the exhaust channel 32b, the spiral angle range of the rib 31 is 0 - 70°.
[0035] In some embodiments, in the exhaust channel 32b, the pitch range of the rib 31 is 1.5 - 10 mm.
[0036] In some embodiments, the cross-section of the central tube 1 is circular or oval; a hollow chamber 11 is provided inside the central tube 1.
[0037] In this embodiment, the central tube 1 with a circular cross-section is applicable to a cylindrical battery cell; the central tube 1 with an oval cross-section is applicable to a square battery cell.
[0038] Such as Figure 5 shown, in some embodiments, in the case where the cross-section of the central tube 1 is circular, the inner diameter D range of the hollow chamber 11 is .3 - 1 mm.
[0039] Such as Figure 5 shown, in some embodiments, in the case where the cross-section of the central tube 1 is circular, the wall thickness H range of the hollow chamber 11 is 0.2 - 2.5 mm.
[0040] Such as Figure 6As shown, in some embodiments, the sidewall of the central tube 1 is provided with a through hole group 12, which is arranged in layers to form an upper hole group 121, a middle hole group 122 and a lower hole group 123; the pore density of the upper hole group 121 is P1, the pore density of the lower hole group 123 is P2, the pore density of the middle hole group 122 is P3, the diameter of the through hole 120 of the upper hole group 121 is d1, the diameter of the through hole 120 of the lower hole group 123 is d2, and the diameter of the through hole 120 of the middle hole group 122 is d3.
[0041] In one application scenario, the upper pore group 121, the middle pore group 122, and the lower pore group 123 satisfy d1=d2=d3 and P1≈P2<P3; wherein, the pore density of each layer in the through-hole group 12 is different, which can balance the difference in the axial distribution of electrolyte; by setting multiple rows of through holes along the height direction on the sidewall of the central tube 1, the electrolyte can be controlled to seep out from different heights, improving the uniformity of the upper and lower parts of the electrode in the cell 4 and reducing the risk of lithium plating.
[0042] In another application scenario, the upper hole group 121, the middle hole group 122 and the lower hole group 123 satisfy P1=P2=P3 and d1≈d2<d3; wherein, the number of through holes 120 in each hole group is the same, and the wettability of the middle part of the cell 4 is improved by the different hole diameters.
[0043] In some embodiments, the through holes 120 in the through hole group 12 are arranged radially along the central tube 1, and their cross-sectional area ranges from 1 to 3 mm2.
[0044] In this embodiment, if the area of the through hole 120 is too large, too much electrolyte will flow out at once, which is not conducive to the uniform distribution of electrolyte; if the area of the through hole 120 is too small, it is not conducive to the outflow of electrolyte.
[0045] In some embodiments, the ratio of the total cross-sectional area of all through holes 120 in the through hole group 12 to the surface area of the central tube 1 is >30%.
[0046] like Figure 7 As shown, in some embodiments, the sidewall of the buffer 3 is provided with a plurality of immersion holes 33; wherein each immersion hole 33 is located on the rib 31, and at least some of the immersion holes 33 coincide with the through holes 120 in the through hole group 12.
[0047] In some embodiments, the hollow chamber 11 is filled with a phase change heat-absorbing material.
[0048] In this embodiment, the phase change heat-absorbing material can dissipate heat inside the cell 4, optimize the heat transfer path between the inside and outside heat exchange plates of the cell 4, reduce the temperature difference between the middle and the edge of the battery, and improve the overall temperature uniformity.
[0049] In some embodiments, the support member 2 is provided with an exhaust groove (not shown in the figure), which is connected to the exhaust channel of the buffer member 3 to facilitate exhaust.
[0050] At least one embodiment also provides a battery, including: a cell 4 having a central hole 41 at its axial center; a central tube assembly; wherein the central tube 1 and the buffer 3 of the central tube assembly are jointly disposed within the central hole 41 of the cell 4.
[0051] In summary, by employing a flexible and expandable buffer 3, the central tube assembly and battery of this battery cell not only prevent damage to the battery cell 4 during insertion, but also dynamically fit the inner wall of the central hole 41 after expansion, so as to adapt to the expansion and contraction of the battery cell 4 during charging and discharging.
[0052] 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.
[0053] 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.
[0054] 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.
[0055] 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.
[0056] 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.
[0057] 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.
[0058] 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.
[0059] 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.
[0060] 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.
[0061] 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 central tube assembly for battery cells, characterized in that, Comprising: A central tube (1); At least one support member (2), connected to the corresponding end of the central tube (1); A buffer member (3), sleeved on the central tube (1), adapted to be disposed together with the central tube (1) in the central hole (41) of the battery cell (4); wherein At least one rib (31) adapted to form an exhaust passage (32a, 32b) is provided on the side wall of the buffer member (3); The buffer member (3) expands after being infiltrated with electrolyte so that the rib (31) abuts against the inner wall of the central hole (41).
2. The central tube assembly for a battery cell according to claim 1, wherein At least three of the ribs (31) are arranged axially along the buffer member (3) to form at least three linear exhaust passages (32a), so that the ribs (31) axially abut against the inner wall of the central hole (41).
3. The central tube assembly for a battery cell according to claim 1, wherein At least one of the ribs (31) is arranged in a spiral shape to form at least one spiral exhaust passage (32b), so that the ribs (31) hierarchically abut against the inner wall of the central hole (41).
4. The central tube assembly for a battery cell according to claim 2, wherein In the exhaust passage (32a), the ribs (31) are evenly distributed to approximately form a "rice" shape or a "Y" shape or a "cross" shape.
5. The central tube assembly for a battery cell according to claim 3, wherein In the exhaust passage (32b), the spiral angle range of the rib (31) is 0 - 70°; And / or, in the exhaust passage (32b), the pitch range of the rib (31) is 1.5 - 10 mm.
6. The central tube assembly for a battery cell according to claim 1, wherein The material of the central tube (1) is an aluminum alloy material or a high - elasticity titanium alloy material; And / or, the cross - section of the central tube (1) is circular or elliptical, and a hollow chamber (11) is provided inside the central tube (1), and a phase - change heat - absorbing material is filled in the hollow chamber (11).
7. The central tube assembly for a battery cell according to claim 6, wherein In the case where the cross - section of the central tube (1) is circular, the inner diameter D range of the hollow chamber (11) is 0.3 - 1 mm; And / or, in the case where the cross - section of the central tube (1) is circular, the wall thickness H range of the hollow chamber (11) is 0.2 - 2.5 mm.
8. The central tube assembly for a battery cell according to claim 1, wherein Through - hole groups (12) are provided on the side wall of the central tube (1), and the through - hole groups (12) are arranged in layers to form an upper - layer hole group (121), a middle - layer hole group (122), and a lower - layer hole group (123); The pore density of the upper - layer hole group (121) is P1, the pore density of the lower - layer hole group (123) is P2, the pore density of the middle - layer hole group (122) is P3, the diameter of the through - hole (120) of the upper - layer hole group (121) is d1, the diameter of the through - hole (120) of the lower - layer hole group (123) is d2, and the diameter of the through - hole (120) of the middle - layer hole group (122) is d3; wherein The upper hole group (121), the middle hole group (122), and the lower hole group (123) satisfy d1=d2=d3, and P1≈P2<P3; or The upper hole group (121), the middle hole group (122) and the lower hole group (123) satisfy P1=P2=P3 and d1≈d2<d3.
9. The central tube assembly for battery cells as described in claim 8, characterized in that, The buffer (3) has a plurality of liquid immersion holes (33) on its side wall. Each of the liquid immersion holes (33) is located on the rib (31), and at least some of the liquid immersion holes (33) coincide with the through holes (120) in the through hole group (12). And / or, the through holes (120) in the through hole group (12) are arranged radially along the central tube (1), and their cross-sectional area ranges from 1 to 3 mm. 2 ; And / or, the ratio of the total cross-sectional area of all through holes (120) in the through hole group (12) to the surface area of the central tube (1) is >30%.
10. A battery, characterized in that, include: The battery cell (4) has a central hole (41) at its axis. The central tube assembly as described in any one of claims 1-9; wherein The central tube (1) and the buffer (3) of the central tube assembly are together disposed in the central hole (41) of the cell (4).