Battery cell
By using thermally conductive structural adhesive and thermally conductive components to insulate the battery cells with the casing, the problem of large temperature differences in large battery cells is solved, heat is evenly distributed, battery safety and lifespan are improved, and lithium plating is suppressed.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-07-28
AI Technical Summary
As battery capacity increases, the temperature difference at different locations within a single battery cell gradually increases, leading to a shortened lifespan of the battery cell throughout its entire life cycle and lithium deposition issues at the electrode edges.
Thermally conductive structural adhesive is used to cover the thermally conductive components in contact with the inner wall of the housing. The thermally conductive components provide a conduction path and increase the conduction area, which can quickly conduct heat and distribute it evenly. Combined with insulating connections, it can prevent short circuits and improve the mechanical support strength.
It effectively reduces the internal temperature difference of battery cells, improves safety, extends service life, inhibits lithium plating, and ensures normal operation and stability of the battery.
Smart Images
Figure CN224570097U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of energy storage technology, and in particular to a battery cell. Background Technology
[0002] As battery capacity increases, the size of individual battery cells gradually increases. This increased size leads to greater temperature differences at different locations within the battery cell. Increased temperature differences not only affect the overall lifespan of the battery cell but also contribute to lithium plating issues at the electrode edges.
[0003] However, there is a lack of relevant technologies that can effectively solve the problem of large temperature differences at different locations within a single battery cell.
[0004] Therefore, there is an urgent need to provide a solution that can effectively address the excessive temperature difference at different locations within a single battery cell. Utility Model Content
[0005] The main purpose of this application is to propose a battery cell that aims to solve the problem of excessive temperature difference at different locations within the battery cell.
[0006] On the one hand, a battery cell is provided, comprising:
[0007] case;
[0008] A cover plate is provided at the opening of the housing;
[0009] An inner core is disposed within the housing; the inner core includes a first electrode, a second electrode, and a diaphragm disposed between the first electrode and the second electrode; the first electrode includes a first electrode body, a first electrode tab connected to the first electrode body, and a first heat-conducting element connected to the first electrode body.
[0010] A first thermally conductive structural adhesive is applied to the first thermally conductive component and comes into contact with the inner wall of the housing.
[0011] In one embodiment, the number of the first heat-conducting elements is one or more.
[0012] In one embodiment, the first heat-conducting element extends from the bottom of the inner core.
[0013] In one embodiment, the first thermal conductive element extends from at least one peripheral side of the inner core.
[0014] In one embodiment, the thickness of the first thermally conductive structural adhesive is 0.8 mm to 3.0 mm.
[0015] In one embodiment, the second electrode includes a second electrode body, a second electrode tab connected to the second electrode body, and a second heat-conducting element connected to the second electrode body;
[0016] The battery cell also includes a second thermally conductive structural adhesive, which covers the second thermally conductive component and contacts the inner wall of the housing.
[0017] In one embodiment, the number of the second heat-conducting elements is equal to the number of the first heat-conducting elements.
[0018] In one embodiment, the second heat-conducting element extends from the bottom of the inner core;
[0019] And / or, the second thermal conductive element extends from at least one peripheral side of the inner core.
[0020] In one embodiment, the number of openings is one, and the cover plate is provided with a first pole post and a second pole post;
[0021] The first electrode and the second electrode are respectively led out from the same side end of the inner core. The first electrode is connected to the first electrode post, and the second electrode is connected to the second electrode post.
[0022] In one embodiment, there are two openings, namely a first opening and a second opening; there are two cover plates, namely a first cover plate disposed in the first opening and a second cover plate disposed in the second opening, wherein the first cover plate is provided with a first pole post and the second cover plate is provided with a second pole post;
[0023] The first electrode and the second electrode are respectively led out from different sides of the inner core. The first electrode is connected to the first pole post provided on the first cover plate, and the second electrode is connected to the second pole post provided on the second cover plate.
[0024] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects:
[0025] The technical solution of this application provides a conduction path and increases the conduction area through the first conductive element, thereby reducing the internal thermal resistance of the battery cell and rapidly conducting heat. This allows the heat generated inside the battery cell to be quickly conducted from the high-temperature area to the casing and then conducted out of the battery cell through the casing, thus achieving a uniform heat distribution. This uniform temperature distribution can effectively reduce local overheating or overcooling, thereby reducing the temperature difference between different locations. This solves the problem of large temperature differences between different locations in battery cells, especially large-volume battery cells, improving the safety of the battery cells, extending the service life of the battery cells, and further suppressing lithium plating caused by gaps at the edges of the core during the core expansion process.
[0026] The first thermally conductive structural adhesive covers the first thermally conductive component and contacts the inner wall of the casing, achieving an insulating connection between the first thermally conductive component and the casing. This insulating connection can, to a certain extent, prevent short circuits between the first thermally conductive component and the casing from causing thermal runaway in the battery cell, thus protecting the normal operation of the battery cell and improving its safety. The insulating connection between the first thermally conductive component and the casing can also, to a certain extent, improve the mechanical support strength and enhance the stability and reliability of the first thermally conductive component within the battery cell. Attached Figure Description
[0027] 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.
[0028] Figure 1 This is a schematic diagram of the structure of one embodiment of the inner core of this application;
[0029] Figure 2 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;
[0030] Figure 3 This is a schematic diagram of another embodiment of the battery cell of this application;
[0031] Figure 4 This is a schematic diagram of the structure of another embodiment of the battery cell of this application.
[0032] Explanation of icon numbers:
[0033] 100. Shell;
[0034] 200, Inner core; 210, First electrode; 211, First electrode body; 212, First electrode tab; 213, First heat-conducting element; 220, Second electrode; 221, Second electrode body; 222, Second electrode tab; 223, Second heat-conducting element; 230, Diaphragm;
[0035] 300, Thermally conductive structural adhesive; 310, First thermally conductive structural adhesive; 320, Second thermally conductive structural adhesive;
[0036] 400, Cover plate; 410, First cover plate; 420, Second cover plate.
[0037] 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
[0038] 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.
[0039] 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.
[0040] 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.
[0041] As the capacity of individual battery cells increases, their size also gradually increases. The path for heat to transfer from the high-temperature areas (center and tabs) to the low-temperature areas (bottom and sides) within the battery cell becomes longer, leading to a significant increase in the temperature difference between the upper and lower surfaces. Because the upper surface of the battery cell is more exposed to airflow, while the lower surface has a smaller contact area and limited airflow, the heat dissipation efficiency of the upper surface is higher than that of the lower surface, further exacerbating the temperature difference between the upper and lower parts of the battery cell. This temperature difference not only accelerates uneven aging of the battery cells, leading to capacity decay, increased internal resistance, and a shortened lifespan, but may also indirectly induce lithium plating at the electrode edges through uneven local current distribution.
[0042] To effectively address the problem of large temperature differences at different locations in battery cells, especially large-volume battery cells, embodiments of this application propose a battery cell.
[0043] like Figure 1 , Figure 2As shown, in some embodiments, the battery cell includes a housing 100, a cover plate 400, and an inner core 200. The cover plate 400 is disposed at the opening of the housing 100; the inner core 200 is disposed inside the housing 100. The inner core 200 includes a first electrode 210, a second electrode 220, and a separator 230 disposed between the first electrode 210 and the second electrode 220; the first electrode 210 includes a first electrode body 211, a first tab 212 connected to the first electrode body 211, and a first heat-conducting element 213 connected to the first electrode body 211.
[0044] like Figure 2 As shown, the battery cell also includes a first thermally conductive structural adhesive 310, which covers the first thermally conductive element 213 and is in contact with the inner wall of the housing 100.
[0045] The cover plate 400 and the shell 100 enclose a space for the inner core 200 to be installed. One of the first electrode 210 and the second electrode 220 is a positive electrode and the other is a negative electrode. The separator provides physical isolation to prevent short circuits between the positive and negative electrodes and provides ion channels. The first thermal conductive element 213 can be made of materials with high thermal conductivity, such as copper, aluminum, or graphite. By providing a conduction path and increasing the conduction area, the first thermal conductive element 213 reduces the internal thermal resistance of the battery cell and quickly conducts heat, allowing the heat generated inside the battery cell to be quickly conducted from the high-temperature area to the outside of the battery cell.
[0046] like Figure 1 , Figure 2 As shown, taking the first electrode 210 as an example of a positive electrode, the first electrode body 211 includes a current collector and a positive active material and conductive agent coated on the current collector. The current collector can be a positive electrode foil (such as aluminum foil) used to collect and conduct current. The first tab 212 is a positive tab, which is connected to the current collector of the first electrode body 211 by welding or pressing. The cover plate 400 is provided with a positive electrode post, and the first tab 212 is connected to the external circuit through the positive electrode post. The first thermally conductive element 213 achieves an insulating connection with the shell 100 through the first thermally conductive structural adhesive 310. If there is no insulating connection between the first thermally conductive element 213 and the shell 100, it may lead to a short circuit or other electrical faults. The insulating connection between the first thermally conductive element 213 and the shell 100 can, to a certain extent, prevent the first thermally conductive element 213 from short-circuiting with the shell 100 and causing thermal runaway of the battery cell, and can also improve the mechanical support strength.
[0047] The relevant embodiments of the first electrode 210 using a negative electrode can be referred to the aforementioned embodiments of the first electrode 210 using a positive electrode, and will not be repeated here.
[0048] The first thermally conductive structural adhesive 310 can be a thermally conductive structural adhesive containing components such as fluorosilicone rubber / polytetrafluoroethylene (PTFE) / epoxy-phenolic resin blend system. These thermally conductive structural adhesives have high temperature resistance, corrosion resistance, high process adaptability, are easy to apply, have high mechanical strength after curing, can withstand certain mechanical stress, and can ensure the long-term stability of the connection structure to a certain extent.
[0049] In addition to the first thermally conductive structural adhesive 310, in some other embodiments, the first thermally conductive element 213 can be insulated from the housing 100 by other thermally conductive media that cover the first thermally conductive structural adhesive 310 and are in contact with the inner wall of the housing 100. These thermally conductive media can be, but are not limited to, thermally conductive gels and thermally conductive ceramic sheets. Thermally conductive gels made of silicone oil and thermally conductive fillers (such as alumina) are easy to automate, suitable for filling tiny gaps, and can ensure uniform heat conduction, thus avoiding local overheating to a certain extent. Thermally conductive ceramic sheets made of aluminum nitride (AlN), silicon nitride (SiO4), or alumina (AlO3) not only achieve efficient heat conduction but also have high insulation and high temperature resistance.
[0050] like Figure 2 As shown in the embodiments of this application, the first heat-conducting element 213 reduces the internal thermal resistance of the battery cell by providing a conduction path and increasing the conduction area, and rapidly conducts heat. This allows the heat generated inside the battery cell to be quickly conducted from the high-temperature area to the casing 100, and then conducted out of the battery cell through the casing 100. This helps to prevent excessive heat accumulation in local areas inside the battery cell, thereby achieving a uniform heat distribution. Such a uniform temperature distribution can effectively reduce local overheating or overcooling, thereby reducing the temperature difference between different locations. This effectively solves the problem of large temperature differences between different locations in battery cells, especially large-volume battery cells, improves the safety of the battery cells, makes the performance of the battery cells more stable during charging and discharging, and further solves the problem of lithium plating at the electrode edges, effectively extending the service life of the battery cells.
[0051] The first thermally conductive structural adhesive 310 covers the first thermally conductive element 213 and contacts the inner wall of the housing 100, achieving an insulating connection between the first thermally conductive element 213 and the housing 100. This insulating connection can, to a certain extent, prevent short circuits between the first thermally conductive element 213 and the housing 100 that could lead to thermal runaway of the battery cell, thus protecting the normal operation of the battery cell and improving its safety. The insulating connection between the first thermally conductive element 213 and the housing 100 can also, to a certain extent, improve mechanical support, enhance the stability and reliability of the first thermally conductive element 213 within the battery cell, and suppress lithium plating that can occur due to gaps at the edges of the inner core 200 during its expansion.
[0052] In one embodiment, the first thermally conductive structural adhesive 310 is non-conductive to electrons and ions, serving as insulation while conducting heat from the inner core 200 to the shell 100 for heat dissipation, thus improving internal temperature uniformity. The thickness of the first thermally conductive structural adhesive 310 can be 0.8mm to 3.0mm, such as any range like 1.0mm to 2.5mm, 1.5mm to 2.0mm, or any thickness like 1.0mm, 1.5mm, or 2.5mm, used to optimize heat dissipation performance, achieve an insulating connection between the inner core 200 and the shell 100, and reduce space occupation.
[0053] like Figure 1 , Figure 2 As shown, taking the first electrode 210 as an example of a positive electrode, the first electrode body 211 includes a current collector and a positive active material, conductive agent and other structures coated on the current collector. The current collector can be a positive electrode foil.
[0054] like Figure 1 , Figure 2 As shown, exemplarily, the first heat-conducting element 213 can be constructed from the positive electrode foil of the first electrode body 211. The positive electrode foil extends out of the inner core 200 and serves as the first heat-conducting element 213. The first heat-conducting element 213 is insulated by a first thermally conductive structural adhesive 310 coated on its surface and is connected to the inner wall of the housing 100 through the first thermally conductive structural adhesive 310 to conduct the heat of the inner core through the housing 100. By utilizing the existing current collector function reuse, the heat of the positive electrode reaction can be conducted to the housing 100 and conducted out of the battery cell through the housing 100 without the need for additional heat transfer components, effectively simplifying the battery cell structure and reducing material costs and manufacturing process complexity. In this way, the temperature difference between different locations of the battery cell can also be reduced, making the overall design of the battery cell more compact and efficient, and effectively extending the battery life.
[0055] In other examples, the first heat-conducting element 213 may also employ additional aluminum foil, copper foil, or composite thermally conductive materials (such as graphene-coated foil). These foils are bonded to the first electrode body 211 by means of adhesive bonding or lamination, and are insulated by a first thermally conductive structural adhesive 310 applied to their surface. The first thermally conductive structural adhesive 310 is then used to connect the first heat-conducting structural material to the inner wall of the housing 100, thereby dissipating the heat from the core through the housing 100. By using additional foil as the first heat-conducting element 213, it is possible to adapt to the thermal conductivity requirements of different practical scenarios.
[0056] The relevant embodiments of the first electrode 210 using a negative electrode can be referred to the aforementioned embodiments of the first electrode 210 using a positive electrode, and will not be repeated here.
[0057] like Figure 1 , Figure 2As shown, in one embodiment, the second electrode 220 includes a second electrode body 221, a second electrode tab 222 connected to the second electrode body 221, and a second thermally conductive element 223 connected to the second electrode body 221; the battery cell also includes a second thermally conductive structural adhesive 320, which covers the second thermally conductive element 223 and contacts the inner wall of the housing 100.
[0058] Taking the second electrode 220 as an example of a negative electrode, the first electrode body 211 includes a current collector and a negative electrode active material and conductive agent coated on the current collector. The current collector can be a negative electrode foil (such as copper foil) used to collect and conduct current. The second electrode tab 222 is a negative electrode tab, which is connected to the current collector of the second electrode body 221 by welding or pressing. The cover plate 400 is provided with a negative electrode post, and the second electrode tab 222 is connected to the external circuit through the negative electrode post. The second thermal conductive element 223 achieves an insulating connection with the housing 100 through the second thermal conductive structural adhesive 320. If there is no insulating connection between the second thermal conductive element 223 and the housing 100, it may lead to a short circuit or other electrical faults. The insulating connection between the second thermal conductive element 223 and the housing 100 can, to a certain extent, prevent the second thermal conductive element 223 from short-circuiting with the housing 100 and causing thermal runaway of the battery cell, and can also improve the mechanical support strength.
[0059] The specific implementation of the second heat-conducting element 223 can be referred to the relevant embodiments of the first heat-conducting element 213 mentioned above, and will not be repeated here.
[0060] like Figure 1 As shown, for example, the first heat-conducting element 213 can be constructed from the positive electrode foil of the first electrode body 211, and the second heat-conducting element 223 can be constructed from the negative electrode foil of the second electrode body 221. The positive electrode foil can be made of aluminum foil, and the negative electrode foil can be made of copper foil. The first heat-conducting element 213 and the second heat-conducting element 223 can conduct heat between the positive and negative electrode regions, reducing the need for additional heat transfer components, lowering costs and structural complexity, achieving a more uniform temperature distribution inside the battery cell, avoiding local overheating or overcooling to a certain extent, and achieving a more comprehensive heat distribution.
[0061] In one embodiment, the second thermally conductive structural adhesive 320 is non-conductive to electrons and ions, serving as insulation while conducting heat from the inner core 200 to the shell 100 for heat dissipation, thus improving internal temperature uniformity. The thickness of the second thermally conductive structural adhesive 320 can be 0.8mm to 3.0mm, such as any range like 1.0mm to 2.5mm or 1.5mm to 2.0mm, or any thickness like 1.0mm, 1.5mm, or 2.5mm, used to optimize heat dissipation performance, achieve an insulating connection between the inner core 200 and the shell 100, and reduce space occupation.
[0062] like Figure 2, Figure 3 As shown, in one embodiment, the number of first heat-conducting elements 213 is one or more.
[0063] Taking the first electrode 210 as the positive electrode as an example, when there is only one first heat-conducting element 213, heat can be concentrated and conducted to the housing 100 through the first heat-conducting element 213, and then the heat can be conducted to the outside of the battery cell through the housing 100. When there are multiple first heat-conducting elements 213, more conduction paths can be provided for heat, reducing the accumulation of heat in local areas. This allows the heat generated inside the battery cell, especially the heat from the positive electrode reaction, to be quickly conducted from the high-temperature area to the housing 100, and then conducted to the outside of the battery cell through the housing 100, achieving uniform heat distribution and reducing the temperature difference between different locations of the battery cell.
[0064] like Figure 2 , Figure 3 As shown, in one embodiment, the number of second heat-conducting elements 223 is one or more.
[0065] Taking the second electrode 220 as the negative electrode as an example, when there is only one second heat-conducting element 223, heat can be concentrated and conducted to the housing 100 through the second heat-conducting element 223, and then the heat can be conducted to the outside of the battery cell through the housing 100. When there are multiple second heat-conducting elements 223, more conduction paths can be provided for heat, reducing the accumulation of heat in local areas. This allows the heat generated inside the battery cell, especially the heat from the negative electrode reaction, to be quickly conducted from the high-temperature area to the housing 100, and then conducted to the outside of the battery cell through the housing 100, achieving uniform heat distribution and reducing the temperature difference between different locations of the battery cell.
[0066] like Figure 2 , Figure 3 As shown, in some embodiments, the number of second heat-conducting elements 223 is equal to the number of first heat-conducting elements 213.
[0067] For example, when the first heat-conducting element 213 is constructed from the positive electrode foil of the first electrode body 211 and the second heat-conducting element 223 is constructed from the negative electrode foil of the second electrode body 221, one, two, or other multiple sets of heat-conducting elements can be provided, and each set of heat-conducting elements includes a first heat-conducting element 213 and a second heat-conducting element 223; the specific configuration can be determined according to actual conditions and is not limited here.
[0068] The number of the second heat-conducting element 223 is equal to the number of the first heat-conducting element 213, which can match the heat flow output efficiency of the positive and negative electrodes, achieve heat conduction balance, and further optimize battery performance.
[0069] For example, this application mainly uses the case where the first heat-conducting element 213 is constructed from the positive electrode foil of the first electrode body 211 and the second heat-conducting element 223 is constructed from the negative electrode foil of the second electrode body 221 as an example for illustration; the first heat-conducting element 213 and the second heat-conducting element 223 can be led out from any position of the inner core 200, such as the bottom of the inner core 200 or the periphery of the inner core 200.
[0070] like Figure 2 As shown, in one embodiment, the first heat-conducting element 213 extends from the bottom of the inner core 200. The bottom of the battery cell is a region where heat accumulates relatively heavily; extending the first heat-conducting element 213 from the bottom of the inner core 200 can effectively reduce heat accumulation and, to some extent, prevent localized overheating. The first heat-conducting element 213 extending from the bottom can quickly conduct the heat generated at the bottom of the battery cell to the bottom of the battery cell casing, facilitating heat exchange with heat dissipation devices (such as heat sinks, liquid cooling plates, etc.) located outside the battery cell.
[0071] like Figure 3 As shown, in another embodiment, the first heat-conducting element 213 extends out of at least one peripheral side of the inner core 200. Extending the first heat-conducting element 213 from the peripheral side of the inner core 200 facilitates manufacturing and installation, and to some extent avoids localized overheating. The first heat-conducting element 213 extending from the peripheral side of the inner core 200 can quickly conduct heat from inside the battery cell to the sidewall of the battery cell casing, and facilitates heat exchange with heat dissipation devices (such as heat sinks, liquid cooling plates, etc.) located outside the battery cell.
[0072] When there is only one first heat-conducting element 213, the first heat-conducting element 213 can be led out from any one of the circumferential sides of the inner core 200. When there are multiple first heat-conducting elements 213, the distance between the multiple first heat-conducting elements 213 led out from the inner core 200 can be the same or different; the specific distance can be set according to actual conditions and is not limited here.
[0073] like Figure 2 As shown, in one embodiment, the second heat-conducting element 223 extends out of the bottom of the inner core 200. Since the bottom of the battery cell is an area where heat accumulates relatively heavily, extending the second heat-conducting element 223 from the bottom of the inner core 200 can effectively reduce heat accumulation and, to some extent, prevent localized overheating.
[0074] like Figure 3 As shown, in another embodiment, the second heat-conducting element 223 extends from at least one peripheral side of the inner core 200. By extending the second heat-conducting element 223 from the peripheral side of the inner core 200, manufacturing and installation are facilitated, and localized overheating is avoided to some extent.
[0075] When there is only one second heat-conducting element 223, the second heat-conducting element 223 can be led out from any one of the circumferential sides of the inner core 200. When there are multiple second heat-conducting elements 223, the distance between the multiple second heat-conducting elements 223 led out from the inner core 200 can be the same or different; the specific distance can be set according to actual conditions and is not limited here.
[0076] Specific embodiments of the second heat-conducting element 223 extending from the bottom of the inner core 200 or extending from at least one peripheral side of the inner core 200 can be referred to the relevant embodiments of the first heat-conducting element 213 described above, and will not be repeated here.
[0077] like Figure 2 As shown, it should be noted that when both the first heat-conducting element 213 and the second heat-conducting element 223 extend from the bottom of the inner core 200, thermally conductive structural adhesive 300 can be filled at the bottom of the housing 100. The thermally conductive structural adhesive 300 covers the first heat-conducting element 213 and the second heat-conducting element 223 and contacts the inner wall of the bottom of the housing 100, thereby achieving an insulating connection between the first heat-conducting element 213, the second heat-conducting element 223 and the housing 100. Related embodiments where both the first heat-conducting element 213 and the second heat-conducting element 223 extend from the same circumferential side of the inner core 200 can be referred to accordingly without further elaboration.
[0078] For example, such as Figure 2 , Figure 3 As shown, a first heat-conducting element 213 and a second heat-conducting element 223 can be provided along the first direction D1 of the battery cell. The first heat-conducting element 213 and the second heat-conducting element 223 can be, but are not limited to, extending from the bottom of the inner core 200, extending from any circumference of the inner core 200, or extending from the top of the inner core 200. This is used to reduce the temperature rise difference between different positions of the inner core 200 in a short time, reduce the temperature difference between different positions such as the top and bottom of the battery cell, and extend the service life of the battery cell. The first direction D1 can correspond to the height direction of the battery cell. When the first tab and the second tab of the battery cell are located on the same side, the height direction of the battery cell is determined by the direction from the side of the battery cell with tabs (top) to the side of the battery cell without tabs (bottom), and the first direction D1 is determined accordingly. When the first tab and the second tab of the battery cell are located on different sides, the first direction D1 is determined along the direction from the root of the first tab to the root of the second tab. The specific first direction D1 can be determined according to the actual situation and is not limited here.
[0079] like Figure 3 , Figure 4As shown, in one embodiment, the first tab 212 and the second tab 222 are arranged facing the opening of the housing 100 to reduce space occupation and facilitate current output. The cover plate 400 is provided with a first post and a second post, the first post and the first tab 212 having the same polarity, and the second post and the second tab 222 having the same polarity.
[0080] like Figure 3 As shown, as an example, there is one opening, and the cover plate is provided with a first pole and a second pole; the first pole ear 212 and the second pole ear 222 are respectively led out from the same side end of the inner core 200, the first pole ear 212 is connected to the first pole, and the second pole ear 222 is connected to the second pole.
[0081] The first electrode 212 and the second electrode 222 are both oriented towards the same opening and are respectively connected to the first electrode post and the second electrode post located on the same cover plate 400 to form a single-end electrode structure. The overall structure is simple and easy to integrate.
[0082] like Figure 4 As shown, as another example, there are two openings, namely a first opening and a second opening; there are two covers, namely a first cover 410 provided in the first opening and a second cover 420 provided in the second opening; the first cover 410 is provided with a first pole post, and the second cover 420 is provided with a second pole post. The first pole lug 212 and the second pole lug 222 are respectively led out from different sides of the inner core 200. The first pole lug 212 is connected to the first pole post provided in the first cover 410, and the second pole lug 222 is connected to the second pole post provided in the second cover 420.
[0083] For example, the first opening and the second opening are arranged opposite to each other along the first direction D1. The first tab 212 and the second tab 222 are led out from different sides of the inner core 200. The first tab 212 is arranged towards the first opening and connected to the first pole provided on the first cover plate 410. The second tab 222 is arranged towards the second opening and connected to the second pole provided on the second cover plate 420, forming an opposite-end tab structure. The two cover plates 400 are respectively arranged corresponding to the first opening and the second opening, which can improve heat dissipation efficiency, make the current distribution uniform, and improve the performance and safety of the battery cell.
[0084] For example, a liquid cooling plate, heat sink, heat-conducting plate, or other heat dissipation device can be installed on the outside of the housing. The contact positions of the first thermally conductive structural adhesive 310 and the second thermally conductive structural adhesive 320 with the housing 100 can be located close to the heat dissipation device on the outside of the housing. The specific location can be determined according to the actual installation of the heat dissipation device, and is not limited here.
[0085] The above description is merely an exemplary embodiment of this application and does not limit the scope of protection. 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 scope of protection.
Claims
1. A battery cell, characterized in that, include: case; A cover plate is provided at the opening of the housing; An inner core is disposed within the housing; the inner core includes a first electrode, a second electrode, and a diaphragm disposed between the first electrode and the second electrode; the first electrode includes a first electrode body, a first electrode tab connected to the first electrode body, and a first heat-conducting element connected to the first electrode body. A first thermally conductive structural adhesive is applied to the first thermally conductive component and comes into contact with the inner wall of the housing.
2. The battery cell as described in claim 1, characterized in that, The number of the first heat-conducting elements is one or more.
3. The battery cell as described in claim 1, characterized in that, The first heat-conducting element extends from the bottom of the inner core and is disposed within the inner core.
4. The battery cell as described in claim 1, characterized in that, The first heat-conducting element extends from at least one peripheral side of the inner core.
5. The battery cell as described in claim 1, characterized in that, The thickness of the first thermally conductive structural adhesive is 0.8 mm to 3.0 mm.
6. The battery cell according to any one of claims 1 to 5, characterized in that, The second electrode includes a second electrode body, a second electrode tab connected to the second electrode body, and a second heat-conducting element connected to the second electrode body; The battery cell also includes a second thermally conductive structural adhesive, which covers the second thermally conductive component and contacts the inner wall of the housing.
7. The battery cell as described in claim 6, characterized in that, The number of the second heat-conducting elements is equal to the number of the first heat-conducting elements.
8. The battery cell as described in claim 6, characterized in that, The second heat-conducting element extends from the bottom of the inner core and is disposed within the inner core. And / or, the second thermal conductive element extends from at least one peripheral side of the inner core.
9. The battery cell as described in claim 6, characterized in that, The number of openings is one, and the cover plate is provided with a first pole post and a second pole post; The first electrode and the second electrode are respectively led out from the same side end of the inner core. The first electrode is connected to the first electrode post, and the second electrode is connected to the second electrode post.
10. The battery cell as described in claim 6, characterized in that, The number of openings is two, namely a first opening and a second opening; the number of cover plates is two, namely a first cover plate provided in the first opening and a second cover plate provided in the second opening, wherein the first cover plate is provided with a first pole post and the second cover plate is provided with a second pole post; The first electrode and the second electrode are respectively led out from different sides of the inner core. The first electrode is connected to the first pole post provided on the first cover plate, and the second electrode is connected to the second pole post provided on the second cover plate.