Inner core and battery cell
By creating through holes in the battery core and inserting heat dissipation units, the problem of low heat dissipation efficiency of the battery core is solved, achieving uniform heat dissipation, extending battery life, and improving performance and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2025-05-08
- Publication Date
- 2026-06-09
AI Technical Summary
In existing technologies, the heat dissipation efficiency of the battery core is low, which leads to ineffective heat dissipation, resulting in decreased battery performance and shortened lifespan.
Through holes are made in the inner core body, and heat dissipation units, such as heat sinks, heat sinks, or heat sinks, are inserted into the through holes. These heat dissipation units absorb and conduct heat, providing a uniform heat dissipation channel.
It improves the heat dissipation efficiency of the core, prevents overheating, extends the lifespan of individual battery cells, improves battery performance and safety, reduces space occupation, and enhances energy density.
Smart Images
Figure CN224342335U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to an inner core and a battery cell. Background Technology
[0002] Excessive temperature inside the battery core can affect battery performance and accelerate battery aging.
[0003] In related technologies, heat is transferred to the edge of the battery cell casing via thermal conduction within the core itself. However, heat conduction through the core itself has low heat dissipation efficiency and cannot achieve effective heat dissipation. Utility Model Content
[0004] The main purpose of this application is to propose an inner core and battery cell that aims to solve the problem of low heat dissipation efficiency.
[0005] On the one hand, an inner core is provided, including:
[0006] The inner core body has through holes; and
[0007] The heat dissipation unit is inserted into the through hole of the inner core body.
[0008] In one embodiment, the inner core body includes a plurality of electrode plates, and each of the plurality of electrode plates has at least one through hole;
[0009] The heat dissipation unit is inserted into the through holes of the multiple electrode plates.
[0010] In one embodiment, a plurality of the electrode plates are stacked sequentially along a first direction.
[0011] In one embodiment, a plurality of the electrode plates are stacked sequentially and wound into a spiral shape.
[0012] In one embodiment, the core body includes a plurality of single-layer laminated cells, each of the single-layer laminated cells including a positive electrode, a separator and a negative electrode stacked sequentially;
[0013] The positive electrode has a positive tab and the negative electrode has a negative tab, and the positive tab of the positive electrode and the negative tab of the negative electrode are staggered.
[0014] In one embodiment, a plurality of single-layer laminated cells are each provided with at least one through hole, and the heat dissipation unit is inserted into the through holes of the plurality of single-layer laminated cells and extends partially out of at least one surface layer of the single-layer laminated cell.
[0015] In one embodiment, a first insulating layer is provided on the surface of the heat dissipation unit that contacts the through hole.
[0016] In one embodiment, the wall of the through hole is covered with a second insulating layer.
[0017] In one embodiment, an insulating thermally conductive medium is filled between the heat dissipation unit and the through hole.
[0018] In one embodiment, the heat dissipation unit is cylindrical.
[0019] In one embodiment, the end of the heat dissipation unit extends out of the inner core body for connection to an external cooling device.
[0020] On the other hand, a battery cell is provided, the battery cell including a housing and an inner core as described in any of the above embodiments, the inner core being disposed within the housing.
[0021] In one embodiment, the battery cell further includes a cooling device, and the heat dissipation unit is connected to the cooling device.
[0022] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects:
[0023] The technical solution of this application provides a heat dissipation channel by opening a through hole in the inner core body. The heat dissipation unit is inserted into the through hole of the inner core body, which can achieve uniform heat dissipation of the inner core body. The heat dissipation unit absorbs the heat of the inner core body, which can effectively solve the problem of low heat dissipation efficiency and reduce the heat of the inner core. This is used to improve the heat dissipation efficiency of the inner core, prevent the inner core from overheating, and further extend the service life of the battery cell, improve the performance and safety of the battery cell.
[0024] The combined use of heat dissipation units and through holes can reduce the space occupied by the core, realize the integrated design of the core and battery cells, and improve energy density. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the structure of one embodiment of the inner core of this application;
[0027] Figure 2 This is a schematic diagram of the structure from another perspective of one embodiment of the core of this application;
[0028] Figure 3 This is an exploded view of one embodiment of the core of this application;
[0029] Figure 4 This is a schematic diagram of the structure of one embodiment of the inner core body of this application;
[0030] Figure 5 This is a schematic diagram of another embodiment of the core body of this application;
[0031] Figure 6 This is a schematic diagram of the structure of one embodiment of the single-laminated battery cell of this application;
[0032] Figure 7 This is a cross-sectional view of an embodiment of the inner core of this application;
[0033] Figure 8 This is a cross-sectional view of another embodiment of the core of this application;
[0034] Figure 9 This is a cross-sectional view of yet another embodiment of the core of this application;
[0035] Figure 10 This is a partial schematic diagram of one embodiment of the battery cell of this application.
[0036] Explanation of icon numbers:
[0037] 10. Inner core;
[0038] 100. Inner core body; 101. Through hole; 110. Single-layer laminated cell; 111. Positive electrode plate; 1111. Positive electrode tab; 112. Negative electrode plate; 1121. Negative electrode tab; 113. Separator;
[0039] 200. Heat dissipation unit;
[0040] 310. First insulating layer; 320. Second insulating layer; 330. Insulating and thermally conductive medium;
[0041] 21. Cooling device.
[0042] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0044] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0045] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0046] During the charging and discharging process of a battery, electrochemical reactions, polarization reactions, and Joule heating caused by current flow due to resistance all generate heat, leading to excessively high temperatures within the battery cells. Excessively high internal temperatures can negatively impact battery performance, accelerate aging, and shorten cycle life.
[0047] Related technologies utilize the heat conduction of the inner core itself to transfer this heat to the edge of the battery cell casing for heat dissipation. However, this method of heat conduction through the inner core itself suffers from low heat dissipation efficiency because it only dissipates heat through the periphery of the inner core, and cannot achieve effective heat dissipation.
[0048] To address the issue of low heat dissipation efficiency, refer to... Figure 1 The embodiments of this application propose an inner core 10 and a battery cell. The inner core 10 includes an inner core body 100, and the inner core body 100 has a through hole 101.
[0049] like Figure 1 , Figure 2 As shown, the through holes 101 provided on the inner core body 100 provide heat dissipation channels, thereby enabling heat dissipation of the inner core body 100 and, to a certain extent, solving the problem of low heat dissipation efficiency that relies on heat dissipation from the periphery of the inner core. For example, the through holes on the inner core body 100 can be provided on one side of the inner core body 100 and extend along the middle of the inner core body 100; or, the through holes on the inner core body 100 can be provided on one side of the inner core body and penetrate through the inner core body 100.
[0050] Related technologies may also place heat pipes on the side or surface of the inner core 10 for heat dissipation. However, this structure occupies a large space for the entire battery system, has low heat dissipation efficiency, does not maximize energy density, and also has the problem of uneven heat dissipation.
[0051] like Figure 2 As shown, the inner core 10 in this embodiment of the application further includes a heat dissipation unit 200, which is inserted into the through hole 101 of the inner core body 100. The heat dissipation unit 200 is used to absorb and conduct heat.
[0052] Unlike methods that place heat pipes on the side or surface of the inner core 10 for heat dissipation, the heat dissipation unit 200 in this embodiment is inserted into the through hole 101 of the inner core body 100. The heat dissipation unit 200 can absorb heat from the electrode plates through the portion connected to the through hole 101, achieving uniform heat dissipation from multiple electrode plates and improving heat dissipation efficiency. The combined use of the heat dissipation unit 200 and the through hole 101 can also reduce the space occupied by the inner core 10, realize the integrated design of the inner core 10 and the battery cell, and improve energy density.
[0053] The number of through holes 101 formed on the inner core body 100 can be one or more. When there is only one through hole 101, the heat dissipation unit 200 is inserted into that one through hole 101 to improve heat dissipation efficiency, achieve centralized heat dissipation, simplify the structure, facilitate assembly, and reduce the material and processing requirements of the inner core body 100. When there are two, three, or other multiple through holes 101, multiple heat dissipation units 200 can be correspondingly provided, with multiple heat dissipation units 200 inserted one-to-one into the corresponding multiple through holes 101 to achieve multi-point coordinated heat dissipation, which is suitable for meeting the heat dissipation requirements of different areas of the inner core 10, reducing temperature differences, and effectively improving heat dissipation efficiency.
[0054] The heat dissipation unit 200 has good thermal conductivity. The heat dissipation unit 200 can be a heat dissipation structure such as a heat sink, heat sink plate, heat sink fins, or heat sink pad, or other heat dissipation devices combining the aforementioned heat dissipation structures. The heat dissipation unit 200 can absorb heat from the electrode plates through the portion connected to the through hole 101.
[0055] like Figure 1 , Figure 2As shown, exemplarily, the end of the heat dissipation unit 200 extends out of the inner core body 100. The heat dissipation unit 200 dissipates heat rapidly to the outside of the inner core 100 through its portion extending out of the inner core body 100, or it transfers heat to other media, cooling devices, etc., connected to it through the portion extending out of the inner core body 100. When multiple heat dissipation units 200 are provided, the multiple heat dissipation units 200 can be arranged independently; or, at least a portion of the multiple heat dissipation units 200 can be interconnected, and the portions extending out of the inner core body 100 of the multiple heat dissipation units 200 are connected mainly by connectors with thermally conductive properties. The heat dissipation unit 200, when used in conjunction with the heat dissipation through-hole 101, can increase the heat dissipation area and improve heat dissipation efficiency.
[0056] The heat dissipation unit 200 is inserted into the through hole 101 of the inner core body 100, enabling uniform heat dissipation from multiple electrode plates, effectively solving the problem of low heat dissipation efficiency and reducing the heat of the inner core 10. This effectively improves the heat dissipation efficiency of the inner core 10, prevents overheating, and further extends the lifespan of the battery cells, improving their performance and safety. The combined use of the heat dissipation unit 200 and the through hole 101 reduces the space occupied by the inner core 10, enabling integrated design of the inner core 10 and the battery cells, and increasing energy density. The overall structure is simple, easy to implement, and convenient to maintain.
[0057] Additionally, one, two, or other ends of the heat dissipation unit 200 extend beyond the inner core body 100, and the portion of the heat dissipation unit 200 extending beyond the inner core body 100 can be used to connect to the external cooling device 21. When a heat sink is used, one or both ends of the heat dissipation unit 200 extend beyond the inner core body, and the end of the heat dissipation unit 200 extending beyond the inner core body 100 can be used to connect to the external cooling device 21. The cooling device 21 can be, but is not limited to, a heat sink, a fan, or a liquid cooling device, and rapid heat dissipation can be achieved through the installation of the cooling device 21.
[0058] like Figure 2 , Figure 3 , Figure 4 As shown, for example, the inner core body 100 includes a plurality of electrode plates. The plurality of electrode plates can be combined in any manner, such as stacking or winding.
[0059] Multiple electrode plates are provided with at least one through hole 101, and the heat dissipation unit 200 is inserted into the through holes 101 of the multiple electrode plates.
[0060] Multiple electrode plates are each provided with at least one through hole 101. The number of through holes on the multiple electrode plates may be the same or different. When the number of through holes on the multiple electrode plates is the same, the processing steps can be reduced. The positions of the through holes 101 on the multiple electrode plates are one-to-one, and the multiple through holes 101 are interconnected. The heat dissipation unit 200 may include at least one heat dissipation rod, which is inserted into all the through holes 101 of the multiple electrode plates in a one-to-one manner. When the number of through holes on the multiple electrode plates is different, the positions of some of the through holes 101 on the multiple electrode plates are one-to-one, and the through holes 101 corresponding to the positions are interconnected. The heat dissipation unit 200 may include at least one heat dissipation rod, which is inserted into the interconnected through holes 101 of the multiple electrode plates in a one-to-one manner.
[0061] The embodiments of this application provide a heat dissipation channel by providing at least one through hole 101 on multiple electrode plates. By inserting a heat dissipation unit 200 into the interconnected through holes 101 of multiple electrode plates, the heat dissipation unit 200 absorbs the heat of the electrode plates, thereby achieving uniform heat dissipation of multiple electrode plates.
[0062] For example, a portion of the heat dissipation unit 200 extends beyond the surface of the inner core body 100, that is, a portion of the heat dissipation unit 200 extends beyond at least one electrode plate on the surface. The heat dissipation unit 200 rapidly dissipates or transfers heat through the portion of the electrode plate extending beyond at least one surface layer.
[0063] The heat dissipation unit 200 is inserted into the through holes 101 of multiple electrode plates, which can effectively solve the problem of low heat dissipation efficiency, reduce the heat of the inner core 10, effectively improve the heat dissipation efficiency of the inner core 10, prevent the inner core from overheating, and further extend the service life of the battery cell, improve the performance and safety of the battery cell.
[0064] It should be noted that the embodiments of this application provide heat dissipation channels for heat dissipation through these interconnected through holes 101 on the electrode plates; the number of through holes 101 on the electrode plates can be two, three or more, and in addition to inserting heat dissipation units 200 on the interconnected through holes 101, the heat dissipation units 200 inserted on the through holes 101 can also be removed, so that the heat of the electrode plates can be carried away through these through holes 101, thereby reducing the heat of the inner core 10.
[0065] like Figure 2 , Figure 3As shown, in some embodiments, the inner core body 100 is a stacked core, with multiple electrode plates arranged in a stacked manner. The multiple electrode plates can be stacked sequentially along a certain stacking direction (such as the first direction D1). When the inner core body 100 is a stacked core, the positions of the through holes 101 formed on the electrode plates correspond to that first direction. Stacked cores are mainly used in high energy density applications. The heat dissipation unit 200 can be vertically inserted between the layers of the stacked core to achieve uniform heat dissipation and reduce local overheating.
[0066] like Figure 4 As shown, in some embodiments, the inner core body 100 is a wound core, with multiple electrode sheets combined in a wound manner. The multiple electrode sheets are stacked sequentially and wound into a spiral shape. When the inner core body 100 is a wound core, the positions of the through holes 101 on the electrode sheets correspond radially. The wound core can be circular or elliptical in shape, and is suitable for applications with relatively mature technologies, such as cylindrical batteries. The heat dissipation unit 200 can be inserted into the wound core radially to achieve heat dissipation and reduce localized overheating.
[0067] like Figure 5 , Figure 6 As shown, taking the type of the inner core body 100 as a stacked core as an example, in one embodiment, multiple electrode plates are stacked sequentially along the first direction D1.
[0068] The positions of the through holes 101 on at least some of the electrode plates correspond to those in the first direction D1. The through holes 101 on multiple electrode plates are interconnected, serving as alignment marks for the multiple electrode plates, ensuring good alignment, reducing poor contact caused by electrode plate displacement, and improving the stability of the core 10. They also significantly improve the heat dissipation efficiency of the battery and enhance the overall performance and safety of the battery cell. The through holes 101 on multiple electrode plates are interconnected along the first direction D1, and the heat dissipation unit 200 is inserted into the interconnected through holes 101. This allows for alignment of the multiple electrode plates to a certain extent, facilitating assembly and preventing electrode plate misalignment. It also reduces the space occupied by the heat dissipation unit 200, saving space in the core 10, increasing energy density, and meeting the requirements of high-power-density battery applications.
[0069] like Figure 5As shown, in one embodiment, the electrode plates include a positive electrode 111 and a negative electrode 112. The inner core body 100 also includes a separator 113, with a separator 113 positioned between adjacent electrode plates. The separator has good insulation properties. The design of the separator can separate adjacent electrode plates, which can, to a certain extent, prevent short circuits caused by direct contact between adjacent electrode plates, thus improving safety. The separator can be made of materials with good thermal stability and electrolyte wetting properties, such as polypropylene (PP) or polyethylene (PE); it can also be a separator coated with insulating materials, such as a separator coated with ceramic materials (such as alumina or boron nitride). The specific design can be determined based on actual conditions and is not limited here.
[0070] It should be noted that at least a portion of the multiple electrode plates are provided with interconnected through holes 101, and the diaphragm disposed between these electrode plates is provided with corresponding through holes 101 so that the through holes 101 are connected.
[0071] In another embodiment, a barrier structure, such as a barrier layer, is coated on the surface of each electrode near the adjacent electrode. This barrier structure has porosity and ionic conductivity comparable to a separator and can completely isolate electrons, thus preventing short circuits caused by direct contact between adjacent electrode sheets and improving safety. For example, an insulating layer can be coated on the two opposite surfaces of the electrode sheets to enhance overall protection. The insulating layer can be made of materials with good thermal conductivity and insulation, such as ceramic materials like alumina or aluminum nitride, polyimide (PI), or polyester (PET).
[0072] In another embodiment, a barrier structure is provided on the surface of each electrode near the adjacent electrode, and a diaphragm is provided between two adjacent electrode sheets. This combines the advantages of the two embodiments described above, and even after the diaphragm is punctured or damaged by compression, the barrier structure can still effectively solve the potential short circuit problem, thereby improving safety and structural stability.
[0073] like Figure 5 , Figure 6 As shown, exemplarily, the inner core body 100 includes a plurality of single-layer laminated cells 110, each single-layer laminated cell 110 including a positive electrode 111, a separator 113 and a negative electrode 112 stacked sequentially. The positive electrode 111 has a positive tab 1111 and the negative electrode 112 has a negative tab 1121, and the positive tab 1111 of the positive electrode 111 and the negative tab 1121 of the negative electrode 112 are staggered from each other.
[0074] The core body 100 includes multiple single-layer laminated cells 110 stacked sequentially. Each single-layer laminated cell 110 includes a positive electrode 111, a separator 113, and a negative electrode 112 stacked sequentially, enabling a modular design. Stacking multiple single-layer laminated cells can form a core with a larger capacity. The design of single-layer laminated cells differs from the structure of directly stacking multiple sets of positive electrode, separator, and negative electrode. It facilitates electrode alignment. Through modular design, it can also effectively simplify the overall structure and is suitable for applications requiring reduced size and increased energy density. This can improve the core capacity and energy density while, to some extent, solving the problems of cell short circuits and electrolyte leakage. Adjacent single-layer laminated cells 110 may be provided with separators 113; alternatively, the surface of a single-layer laminated cell 110 near an adjacent single-layer laminated cell 110 may be provided with a barrier structure. The specific configuration can be determined according to actual conditions and is not limited here.
[0075] In one embodiment, multiple single-layer laminated cells 110 each have at least one through hole 101, and a heat dissipation unit 200 is inserted into the through holes 101 of the multiple single-layer laminated cells 110. The heat dissipation unit 200, inserted into the through holes 101 of the multiple single-layer laminated cells, can to some extent also achieve the alignment of the tabs (positive tab 1111, negative tab 1121) of the multiple single-layer laminated cells 110, facilitating assembly. The positive tab 1111 of the positive electrode 111 and the negative tab 1121 of the negative electrode 112 are staggered, and the tabs of the multiple single-layer laminated cells 110 are concentrated on the same side, facilitating unified connection of the multiple single-layer laminated cells 110, reducing the lateral dimension of the core, and contributing to a compact design of the battery cell, reducing the space occupied by the battery cell, and improving energy density.
[0076] like Figure 6 As shown, as an example, the positive tabs 1111 of multiple single-layer laminated cells 110 are aligned with each other, and the negative tabs 1121 of multiple single-layer laminated cells 110 are aligned with each other. That is, along the first direction, the positive tab of any single-layer laminated cell 110 is aligned with the positive tab of the adjacent single-layer laminated cell 110, and the negative tab of any single-layer laminated cell 110 is aligned with the negative tab of the adjacent single-layer laminated cell 110. The positive tabs 1111 and negative tabs 1121 of multiple single-layer laminated cells 110 are arranged in a concentrated manner. The parallel connection of the positive tabs 1111 and the parallel connection of the negative tabs 1121 of multiple single-layer laminated cells 110 can improve the core capacity and power, and support high-power charging and discharging, making it suitable for applications requiring high energy density.
[0077] As another example, the positive tabs 1111 and negative tabs 1121 of any two adjacent single-layer laminated cells 110 are aligned (not shown). That is, along the first direction, the positive tab of any single-layer laminated cell 110 is aligned with the negative tab of an adjacent single-layer laminated cell 110, and the negative tab of any single-layer laminated cell 110 is aligned with the positive tab of an adjacent single-layer laminated cell 110. The positive tabs 1111 and negative tabs 1121 of multiple single-layer laminated cells 110 are arranged alternately. Multiple single-layer laminated cells 110 connected in series can be suitable for applications requiring high voltage.
[0078] In some embodiments, the end or other portion of the heat dissipation unit 200 extends beyond at least one surface layer of the single-layer laminated battery cell 110 to further optimize heat dissipation. The heat dissipation unit 200 can absorb heat from the single-layer laminated battery cell 110 through its portion connected to the through hole 101, and rapidly dissipate heat to the outside of the inner core 10 through the portion of the single-layer laminated battery cell 110 extending beyond at least one surface layer to achieve heat dissipation; alternatively, it can transfer heat to other media, cooling devices, etc. connected to it through the portion of the single-layer laminated battery cell 110 extending beyond at least one surface layer to achieve heat dissipation; this is not limited to any particular embodiment.
[0079] like Figure 7 , Figure 8 As shown, for example, the inner core body 100 includes multiple electrode plates, some of which have through holes 101. These through holes 101 on the electrode plates are interconnected to achieve localized heat dissipation of the inner core body 100; or, all of the multiple electrode plates have through holes 101, and these through holes 101 on the electrode plates are interconnected to achieve uniform heat dissipation of the inner core body 100. Alternatively, the inner core body 100 may include multiple single-layer laminated cells 110, some of which have through holes 101. These through holes 101 on the single-layer laminated cells 110 are interconnected to achieve localized heat dissipation of the inner core body 100; or, all of the single-layer laminated cells 110 have through holes 101, and these through holes 101 on the single-layer laminated cells 110 are interconnected to achieve uniform heat dissipation of the inner core body 100. This application mainly uses the example of multiple electrode plates having through holes 101 for illustration. The specific implementation of a single-layer battery cell can be referred to accordingly without further elaboration.
[0080] Taking an example where all electrode plates have through holes 101, such as Figure 7As shown, in one embodiment, multiple electrode plates each have at least one through hole 101. All of the multiple electrode plates may have at least one through hole 101, forming a heat dissipation channel penetrating the multiple electrode plates to improve heat dissipation efficiency. Alternatively, some of the multiple electrode plates may have interconnected through holes 101, forming a heat dissipation channel penetrating some of the electrode plates. Here, interconnected through holes 101 can be provided in areas where relatively more heat is generated to reduce the temperature in these areas and achieve targeted heat dissipation.
[0081] In addition, the number of electrode plates can be designed according to the actual product requirements; the through holes 101 provided on the electrode plates can be set at any position on the electrode plates, such as in the middle of the electrode plates or on the periphery of the electrode plates; the size, aperture and other dimensions of these interconnected through holes 101 can be the same or different; the specific settings can be set according to actual conditions, and are not limited here.
[0082] like Figure 7 As shown, in one embodiment, all of the multiple electrode plates are provided with through holes 101, and heat dissipation units 200 such as heat sinks are inserted into the through holes 101 at the same position of the multiple electrode plates. The heat dissipation units 200 extend out of the two surface electrode plates.
[0083] like Figure 7 As shown, taking the core body 100 as an example of a stacked core, when multiple electrode plates are stacked sequentially along the first direction D1, there are two electrode plates on the surface along the first direction D1. When all electrode plates are provided with interconnected through holes 101, a heat dissipation channel is formed through multiple electrode plates. A heat dissipation unit 200 is inserted into the interconnected through holes 101 at the same position. The heat dissipation unit 200 transfers heat to other media, cooling devices, etc. connected to it through its portion extending outside the two surface electrode plates to achieve heat dissipation. For example, when the heat dissipation unit 200 is a heat sink, the two ends of the heat sink extend out of the two outermost electrode plates respectively; when the first direction D1 is vertical, the two ends of the heat sink extend out of the uppermost electrode plate and the lowermost electrode plate respectively.
[0084] like Figure 8 As shown, in addition to all of the aforementioned electrode plates having interconnected through holes 101, it is also possible that portions of the multiple electrode plates have interconnected through holes 101, and heat dissipation units 200 are inserted into the interconnected through holes 101 at the same position. In this case, the heat dissipation unit 200 extends out of any of the surface electrode plates (e.g., when the first direction D1 is vertical and the heat dissipation unit 200 is a heat dissipation rod, the end of the heat dissipation rod extends out of the uppermost electrode plate, or the end of the heat dissipation rod extends out of the lowermost electrode plate). The portion of the heat dissipation unit 200 extending out of the electrode plate can transfer heat to other media, cooling devices, etc. connected to it to achieve heat dissipation.
[0085] In some other embodiments, when multiple electrode plates can be wound into a spiral structure (not shown) in a certain order, interconnected through holes 101 are provided through the side of the formed winding structure, and heat dissipation unit 200 partially extends out of the side of the winding structure.
[0086] like Figure 8 As shown, for example, when the inner core body 100 includes multiple electrode plates, the number of through holes 101 on the electrode plates is multiple, and the multiple through holes 101 are spaced apart on the electrode plates.
[0087] By setting multiple through holes 101 on the electrode plates, heat dissipation efficiency can be effectively improved. Depending on the different requirements of the battery product, by rationally designing the hole diameter and the spacing of the through holes 101, heat dissipation efficiency can be improved, and mechanical strength can also be enhanced to a certain extent. This also avoids the problem of uneven electrolyte distribution caused by the lack of spacing. Multiple electrode plates have multiple interconnected through holes 101. By inserting heat dissipation units 200 into these interconnected through holes 101, the heat conduction path can be optimized, further achieving efficient heat dissipation.
[0088] In some embodiments, the number, size, and diameter of the through holes 101 on different electrode plates may be the same or different. When there are multiple through holes 101 on the electrode plates, the distribution of the multiple through holes 101 on each electrode plate may also be the same or different.
[0089] As an example, the specific number and location of through holes 101 can be determined based on the relevant temperature tests of the battery cell. For instance, a relatively large number of through holes 101, with relatively large sizes and relatively small hole spacing can be set for areas with relatively high temperatures in the temperature test.
[0090] In some embodiments, the multiple through holes 101 on the electrode sheet can be arranged in a regular pattern to facilitate processing.
[0091] like Figure 7 As shown, the multiple through holes 101 on the electrode sheet are arranged in an array. The multiple through holes 101 on the electrode sheet can be arranged in a rectangular array, a circular array, etc. The arrangement of multiple through holes 101 according to certain rules and spacing can make heat conduction more evenly and improve heat dissipation efficiency.
[0092] In addition to being arranged in a matrix, the multiple through holes 101 on the electrode sheet can also be arranged in other ways, such as in a ring (the through holes 101 are arranged in a ring around a certain center point or region of the electrode sheet) or in a linear arrangement (the through holes 101 are arranged along a certain direction).
[0093] In other embodiments, the multiple through holes 101 on the electrode sheet can be arranged in an irregular manner, such as random arrangement, and the position and number of through holes 101 can be determined based on the actual cell-related temperature test.
[0094] In some embodiments, the heat dissipation unit 200 itself may be made of a material with good thermal conductivity, such as metals or composite materials. For example, a copper-aluminum composite material may be used to combine the high thermal conductivity of copper with the lightweight properties of aluminum; or, a composite material of graphene and other metals (such as graphene and copper) may be used.
[0095] For the heat dissipation unit 200 using these materials, insulation needs to be considered because the heat dissipation unit 200 is conductive. Specifically, this can be achieved through any one or a combination of other methods in the following embodiments.
[0096] like Figure 8 As shown, as an example, the surface of the heat dissipation unit 200 that contacts the through hole 101 is covered with a first insulating layer 310.
[0097] For example, the first insulating layer 310 can be applied to a portion of the surface of the heat dissipation unit 200 at the location where the heat dissipation unit 200 contacts the multiple inner core bodies 100, by means of covering or coating. Alternatively, the first insulating layer 310 can be applied to the entire surface of the heat dissipation unit 200, such as by covering the heat dissipation unit 200 with insulating material or by coating the entire surface of the heat dissipation unit 200 with insulating material.
[0098] This design can, to some extent, prevent electrical conduction between the heat dissipation unit 200 and the electrode plates of the inner core body 100, thus solving the short circuit problem caused by the conductivity of the heat dissipation unit 200. The first insulating layer 310 can also reduce the thermal resistance between the heat dissipation unit 200 and the electrode plates, improving heat dissipation efficiency.
[0099] like Figure 8 As shown, as another example, the wall of the through hole 101 is covered with a second insulating layer 320.
[0100] This design can, to some extent, avoid direct contact between adjacent electrode plates, thus resolving short circuits caused by direct contact between electrode plates. The second insulating layer 320 can be used to achieve electrical isolation between electrode plates, improving the safety and reliability of the battery; by coating the hole wall of the through hole 101 with the second insulating layer 320, the thermal resistance between the hole wall and the heat dissipation unit 200 can also be reduced, promoting heat conduction.
[0101] The first insulating layer 310 and the second insulating layer 320 need to have good insulation properties and a certain thermal conductivity to achieve a balance between safety and heat dissipation efficiency. For example, the first insulating layer 310 and the second insulating layer 320 can be made of ceramic materials such as alumina or aluminum nitride, polyimide (PI), polyester (PET), etc.; the specific materials can be determined according to actual conditions and are not limited here.
[0102] In other examples, a first insulating layer 310 may be applied to the surface of the heat dissipation unit 200 that contacts the through hole 101, and a second insulating layer 320 may be applied to the walls of all through holes 101 to further improve the safety and reliability of the battery. Specific implementation details can be found in the foregoing embodiments and will not be elaborated upon here.
[0103] like Figure 7 As shown, in some other embodiments, the heat dissipation unit 200 can be made of a material that combines insulation and good thermal conductivity, such as thermally conductive silicone, thermally conductive rubber, or thermally conductive plastic. This reduces processing steps and facilitates battery manufacturing.
[0104] Of course, when the heat dissipation unit 200 has both insulation function and good thermal conductivity, a first insulating layer 310 can be applied to the surface of the heat dissipation unit 200 that contacts the through hole 101, and a second insulating layer 320 can be applied to the hole wall of all through holes 101 to further improve the safety and reliability of the battery; the specific settings can be made according to actual conditions, and are not limited here.
[0105] like Figure 7 , Figure 8 As shown, in some embodiments, the heat dissipation unit 200 is in close contact with the through hole 101.
[0106] The shape and size of the cross-section of the heat dissipation unit 200 are adapted to the shape and size of the through hole 101. The heat dissipation unit 200 is used to absorb and conduct heat. The heat dissipation unit 200 contacts the electrode plate through the through hole 101, which can quickly absorb the heat generated by the inner core 10 when it is working and quickly dissipate the heat of the inner core 10, thereby ensuring the heat dissipation efficiency of the system.
[0107] In this embodiment, a first insulating layer 310 may be applied to the surface of the heat dissipation unit 200 that contacts the through hole 101; a second insulating layer 320 may be applied to the hole wall of the through hole 101; or a combination of the two methods may be used.
[0108] like Figure 9 As shown, in another embodiment, the space between the heat dissipation unit 200 and the through hole 101 is filled with an insulating thermally conductive medium 330.
[0109] The cross-sectional size of the heat dissipation unit 200 may not be larger than the size of the through hole 101, and the shape of the cross-section of the heat dissipation unit 200 may be the same as or different from the shape of the through hole 101. The through hole 101 may be any type of hole such as a round hole, an elliptical hole, or a square hole; the heat dissipation unit 200 may be a heat dissipation structure such as a heat sink or a heat sink plate.
[0110] For example, the heat dissipation unit 200 can be in any shape suitable for practical use, such as a cylinder, an elliptical cylinder, a semi-cylinder, or a cuboid. That is, the cross-section of the heat dissipation unit 200 can be any shape suitable for practical use, such as a circle, an ellipse, a semi-circle, or a rectangle. Among them, the cylindrical and elliptical heat dissipation units 200 can make close contact with the through holes 101 to absorb the heat generated by the inner core 10 during operation and conduct the heat out of the inner core 10. This arrangement can achieve uniform heat dissipation and has a good heat dissipation effect. The cylindrical heat dissipation unit 200 has a simple structure and is easy to manufacture. The semi-cylindrical heat dissipation unit 200 has a semi-circular arc surface and a straight edge. The semi-circular arc surface can fit into the through hole 101. The combination of the semi-circular arc surface and the straight edge also plays a locking role to a certain extent, which can reduce the problem of possible circumferential displacement of the multiple electrode plates of the inner core 10. The cuboid heat dissipation unit 200 can be easily inserted into the through hole 101 of the inner core body 100 and connected and fixed to the inner core body through the through hole 101. It can also achieve uniform heat dissipation in four directions of the through hole through its four sides.
[0111] When a heat sink is inserted into the interconnected through-holes 101, if there is a gap between the heat sink and the through-hole 101, the insulating thermally conductive medium 330 can fill the gap between the heat dissipation unit 200 and the through-hole 101; alternatively, after the heat dissipation unit 200 is inserted into the interconnected through-holes 101, the connection between the heat dissipation unit 200 and the through-hole 101 is achieved through the insulating thermally conductive material. The through-hole 101, through the insulating thermally conductive medium 330, can transfer the heat from the electrode plates to the heat dissipation unit 200, enabling the heat dissipation unit 200 to quickly absorb the heat generated by the inner core 10 during operation and dissipate the heat quickly, thereby improving the system's heat dissipation efficiency. The insulating thermally conductive medium 330 also ensures that the heat sink is stably inserted into the through-hole 101, preventing the heat sink from shifting position. Compared to a design where the heat dissipation unit 200 and the through-hole 101 are in close contact, this arrangement also reduces processing difficulty and facilitates production.
[0112] In this embodiment, there is no limitation on whether the surface of the heat dissipation unit 200 in contact with the through hole 101 is covered with a first insulating layer 310, or whether the walls of all through holes 101 are covered with a second insulating layer 320.
[0113] It should be noted that the aforementioned insulating thermally conductive medium 330 can be thermally conductive silicone, thermally conductive rubber, etc.; or it can be a thermally conductive medium made of silicone as a base and with added thermally conductive fillers (alumina, boron nitride, metal oxides, etc.); the specific configuration can be determined according to actual conditions and is not limited here.
[0114] like Figure 10 As shown, one embodiment of this application proposes a battery cell, which includes a housing and an inner core 10 as described above, with the inner core 10 disposed within the housing. The housing (not shown) has a hollow interior and open ends, and the inner core 10 is disposed within the hollow housing.
[0115] The inner core 10 includes an inner core body 100 and a heat dissipation unit 200. The inner core body 100 has a through-hole 101. The through-hole 101 provides a heat dissipation channel for heat dissipation, enabling heat dissipation of the inner core body 100 and, to some extent, solving the problem of low heat dissipation efficiency when relying on heat dissipation from the inner core's periphery. The heat dissipation unit 200 absorbs and conducts heat. Inserted into the through-hole 101 of the inner core body 100, the heat dissipation unit 200 effectively solves the problem of low heat dissipation efficiency and reduces the heat of the inner core 10. Thus, the heat dissipation efficiency of the inner core 10 can be effectively improved, preventing overheating and further extending the lifespan of the battery cells, improving their performance and safety. The combined use of the heat dissipation unit 200 and the through-hole 101 can reduce the space occupied by the inner core 10, enabling an integrated design of the inner core 10 and the battery cells, and increasing energy density.
[0116] The specific number and location of the through holes 101 are determined based on the relevant temperature tests of the battery cell. When there are multiple through holes 101 on the electrode plate, the multiple through holes 101 are arranged at intervals on the electrode plate.
[0117] The specific structure of the inner core 10 is as described in the above embodiments. Since this battery cell adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0118] like Figure 10 As shown, in one embodiment, the battery cell further includes a cooling device 21, and the heat dissipation unit 200 is connected to the cooling device 21.
[0119] The inner core 10 includes multiple electrode plates (or single-layer laminated cells 110). A portion of the heat dissipation unit 200 extends beyond at least one of the surface electrode plates (or single-layer laminated cells). The portion of the heat dissipation unit 200 extending beyond the surface electrode plates (or single-layer laminated cells) is connected to a cooling device 21. The cooling device 21 can be, but is not limited to, a heat sink, a fan, or a liquid cooling device. The cooling device 21 can be located inside or outside the housing. When the heat dissipation unit 200 extends beyond two surface electrode plates (or single-layer laminated cells), cooling devices 21 can be provided for each of the two surface electrode plates; alternatively, the portions of the heat dissipation unit 200 extending beyond the two surface electrode plates (or single-layer laminated cells) can be connected to the same cooling device 21. For example, when both ends of a heat sink extend beyond the two outermost electrode plates, both ends of the heat sink are connected to the same cooling device 21. The cooling device 21 enables rapid heat dissipation. The cooling device 21 is connected to the part of the heat dissipation unit 200 that extends out of the surface electrode plate, which simplifies the cooling design and reduces maintenance costs.
[0120] In addition, in some embodiments, the cooling device 21 is also equipped with an electronic control component for detecting the temperature of at least one of the inner core body 100, heat dissipation unit 200, and casing, and controlling the operation of the fan, liquid cooling device, etc. according to the detected temperature, or outputting the temperature detection signal to the display or other output device to display the temperature of the battery cell, so as to help the user understand the operating temperature and temperature change of the battery cell.
[0121] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. A core, characterized in that, include: The inner core body has through holes; as well as The heat dissipation unit is inserted into the through hole of the inner core body.
2. The core as described in claim 1, characterized in that, The inner core body includes multiple electrode plates, and each of the multiple electrode plates has at least one through hole; The heat dissipation unit is inserted into the through holes of the multiple electrode plates.
3. The core as described in claim 2, characterized in that, The plurality of electrode plates are stacked sequentially along a first direction.
4. The inner core as described in claim 2, characterized in that, Multiple electrode plates are stacked sequentially and wound into a spiral shape.
5. The core as described in claim 1, characterized in that, The core body includes multiple single-layer laminated cells, each of which includes a positive electrode, a separator, and a negative electrode stacked sequentially. The positive electrode has a positive tab and the negative electrode has a negative tab, and the positive tab of the positive electrode and the negative tab of the negative electrode are staggered.
6. The core as described in claim 5, characterized in that, Each of the multiple single-layer laminated cells has at least one through hole, and the heat dissipation unit is inserted into the through holes of the multiple single-layer laminated cells and partially extends out of at least one surface layer of the single-layer laminated cell.
7. The core as described in any one of claims 1 to 6, characterized in that, The surface of the heat dissipation unit that contacts the through hole is covered with a first insulating layer.
8. The core as described in any one of claims 1 to 6, characterized in that, The wall of the through hole is covered with a second insulating layer.
9. The core as described in any one of claims 1 to 6, characterized in that, An insulating thermally conductive medium is filled between the heat dissipation unit and the through hole.
10. The core as described in any one of claims 1 to 6, characterized in that, The heat dissipation unit is cylindrical.
11. The core as described in any one of claims 1 to 6, characterized in that, The end of the heat dissipation unit extends out of the inner core body and is used to connect to an external cooling device.
12. A single battery cell, characterized in that, It includes a housing and an inner core as described in any one of claims 1 to 11, the inner core being disposed within the housing.
13. The battery cell as described in claim 12, characterized in that, The battery cell also includes a cooling device, and the heat dissipation unit is connected to the cooling device.