Top cover assembly, single battery and battery pack

Abstract

This application relates to the field of energy storage device technology, and discloses a top cover assembly, a single battery cell, and a battery pack. The top cover assembly includes a top cover, terminal blocks, and a heat-conducting component. The base portion of the terminal block is located inside the top cover, and the through portion extends from the mounting hole of the top cover to the outside of the top cover. The heat-conducting component is connected to the through portion of the terminal block on the outside of the top cover, thereby fixing the terminal block to the top cover. Furthermore, the heat-conducting surface of the heat-conducting component abuts against the top cover, thus transferring heat from the inside of the single battery cell and the heat generated by the terminal blocks to the top cover, thereby improving heat dissipation efficiency. Therefore, when the top cover assembly is applied to a single battery cell, it can fix and conduct heat to the terminal blocks, effectively solving the problems of heat accumulation and large temperature differences inside the single battery cell, thereby improving the battery's charge and discharge performance. The single battery cell and battery pack with the above-mentioned top cover assembly also possess the above advantages.

Description

Technical Field

[0001] This application relates to the field of energy storage device technology, and in particular to a top cover assembly, a single cell, and a battery pack. Background Technology

[0002] A single battery cell typically includes a casing, bare cells housed within the casing cavity, and a top cover sealed at the casing opening. The top cover also has terminals for connecting external components, enabling the battery to charge and discharge. During charging and discharging, a single battery cell generates a significant amount of heat. Current single-cell batteries suffer from problems such as severe localized overheating, poor heat dissipation leading to heat accumulation and large temperature differences within the cell, thus affecting its charging and discharging performance. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a top cover assembly that can improve the heat dissipation performance of the pole terminal.

[0004] This application also proposes a single-cell battery including the aforementioned top cover assembly.

[0005] This application also proposes a battery pack including the aforementioned individual cells.

[0006] The top cover assembly of the first aspect of this application includes:

[0007] A top cover has opposing inner and outer sides, and the top cover is provided with mounting holes that pass through the inner and outer sides;

[0008] The pole terminal includes a base portion and a through portion, the through portion protruding from one side of the base portion, the base portion being located on the inner side of the top cover, the through portion passing through the mounting hole and extending to the outer side of the top cover, the base portion and / or the through portion being connected to the top cover at the mounting hole;

[0009] A heat-conducting component is located on the outside of the top cover and connected to the through portion. The heat-conducting component has a heat-conducting surface on the side facing the top cover, and the heat-conducting surface abuts against the top cover for heat transfer between the through portion and the top cover.

[0010] The top cover assembly of the first aspect of this application has at least the following beneficial effects: In the top cover assembly, the base portion of the terminal is located inside the top cover, the through portion extends from the mounting hole to the outside of the top cover, and the heat-conducting element is connected to the through portion and abuts against the top cover on the outside of the top cover, thereby restricting the top cover between the heat-conducting element and the base portion, thereby fixing the terminal to the top cover. Furthermore, the side of the heat-conducting element facing the top cover has a heat-conducting surface, which abuts against the top cover, and can transfer the heat inside the single cell and the heat generated by the terminal from the terminal to the top cover, thereby improving the heat dissipation efficiency. Thus, the heat-conducting element can both fix the terminal and conduct heat to the terminal, effectively solving the problem of heat accumulation and large temperature difference inside the single cell.

[0011] According to some embodiments of this application, the heat-conducting component is provided with a connecting hole, the heat-conducting component is sleeved on the outer wall of the through portion through the connecting hole, the hole wall of the connecting hole abuts against the through portion, the heat-conducting component is provided with a first connecting portion on the hole wall of the connecting hole, and the outer wall of the through portion is provided with a second connecting portion, the first connecting portion and the second connecting portion are detachably connected.

[0012] According to some embodiments of this application, the first connecting portion includes a plurality of buckles, the buckles protruding from the wall of the connecting hole at a predetermined height, and the second connecting portion includes a plurality of buckle grooves that engage with the buckles, the buckle grooves being recessed from the outer wall of the through portion at a predetermined depth, and the buckles being detachably engaged with the buckle grooves; or, the second connecting portion includes a plurality of buckles, the buckles protruding from the outer wall of the through portion at a predetermined height, and the first connecting portion includes a plurality of buckle grooves that engage with the buckles, the buckle grooves being recessed from the wall of the connecting hole at a predetermined depth, and the buckles being detachably engaged with the buckle grooves.

[0013] According to some embodiments of this application, the through portion has a cylindrical structure, the mounting hole has a circular hole structure, and the buckle groove includes a snap-fit ​​section and a guide section that are interconnected. The buckle can enter the guide section and enter the snap-fit ​​section through relative rotation between the heat-conducting member and the through portion. Specifically: the buckle groove is recessed to a predetermined depth from the outer wall of the through portion; the snap-fit ​​section extends circumferentially along the through portion for a predetermined length; and along the axial direction of the through portion, the guide section extends from the groove wall of the snap-fit ​​section in a direction away from the base portion to the end face of the through portion; or, the buckle groove is recessed to a predetermined depth from the hole wall of the connecting hole; the snap-fit ​​section extends axially along the connecting hole for a predetermined length; and along the axial direction of the connecting hole, the guide section extends from the groove wall of the snap-fit ​​section in a direction towards the top cover to the heat-conducting surface.

[0014] According to some embodiments of this application, the guide segment is connected to one end of the snap-fit ​​segment along its length. A limiting portion is also provided on the groove wall of the snap-fit ​​segment connected to the guide segment. The limiting portion protrudes from the groove wall, and a receiving groove is defined between the limiting portion and the end wall of the snap-fit ​​segment at the other end of the guide segment. The receiving groove is capable of accommodating the buckle.

[0015] According to some embodiments of this application, a sealing element is provided between the top cover and the pole terminal. The sealing element is annular and includes a first sealing part and a second sealing part coaxially arranged. The outer diameter of the first sealing part is larger than the outer diameter of the second sealing part. The first sealing part abuts against the inner surface of the top cover and the base part. The second sealing part is connected to the side of the first sealing part opposite to the base part and abuts against the through part and the wall of the mounting hole.

[0016] According to some embodiments of this application, thermally conductive potting compound is used to fill the space between the thermally conductive element and the through portion.

[0017] According to some embodiments of this application, the top cover assembly includes two pole terminals, each of which is provided with a heat-conducting element, wherein: both heat-conducting elements are made of insulating material; or, one of the heat-conducting elements is made of insulating material, and the other heat-conducting element is a conductive element made of conductive material, and the conductive element has a set resistance value.

[0018] The single-cell battery of the second aspect embodiment of this application includes:

[0019] The housing has an inner cavity and an opening communicating with the inner cavity;

[0020] A bare battery cell, housed within the inner cavity, the bare battery cell having tabs on the side facing the opening; and,

[0021] In the top cover assembly of the first aspect embodiment described above, the top cover is connected to the housing and seals the opening, the inner side of the top cover faces the inner cavity, and the pole terminal is electrically connected to the pole tab.

[0022] The single-cell battery of the second aspect of this application has at least the following beneficial effects: the heat-conducting element on the top cover assembly can be used to transfer heat between the through portion of the terminal and the top cover. Therefore, the heat inside the single-cell battery and the heat generated by the terminal can be transferred from the terminal to the top cover, which effectively improves the heat dissipation efficiency and avoids the problem of heat accumulation and large temperature difference inside the single-cell battery, thereby helping to improve the charging and discharging performance of the single-cell battery.

[0023] The battery pack of the third aspect of this application includes a housing and a plurality of individual batteries as described in the second aspect of the application, wherein the individual batteries are housed in the housing.

[0024] The battery pack of the third aspect of this application has at least the following beneficial effects: As can be seen from the above, the individual cells in the battery pack of this embodiment effectively solve the problems of internal heat accumulation and large temperature difference, thereby helping to improve the overall charging and discharging performance of the battery pack.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0027] Figure 1 This is a schematic diagram of the top cover assembly according to an embodiment of this application;

[0028] Figure 2 for Figure 1 A cross-sectional view of the top cover assembly along section AA of one embodiment;

[0029] Figure 3 for Figure 2 A magnified view of section B in the diagram;

[0030] Figure 4 for Figure 2 An exploded view of the top cover assembly in the illustrated embodiment;

[0031] Figure 5 for Figure 2 An exploded view of the heat-conducting component and the pole terminal of the top cover assembly in the embodiment shown.

[0032] Figure 6 for Figure 5 A schematic diagram of the structure of the top cover assembly after the heat-conducting components and pole terminals are assembled;

[0033] Figure 7 for Figure 5 A schematic diagram of the structure of the pole terminal in the top cover assembly of the embodiment shown;

[0034] Figure 8 for Figure 5 A schematic diagram of the structure of the heat-conducting component in the top cover assembly of the embodiment shown;

[0035] Figure 9 for Figure 1 A cross-sectional view of the top cover assembly along section AA of another embodiment;

[0036] Figure 10 for Figure 9 A magnified view of part C in the diagram;

[0037] Figure 11 for Figure 9 An exploded view of the heat-conducting component and the pole terminal of the top cover assembly in the embodiment shown.

[0038] Figure 12 for Figure 11 A schematic diagram of the structure of the top cover assembly after the heat-conducting components and pole terminals are assembled;

[0039] Figure 13 for Figure 11 A schematic diagram of the structure of the pole terminal in the top cover assembly of the embodiment shown;

[0040] Figure 14 for Figure 11 A schematic diagram of the structure of the heat-conducting component in the top cover assembly of the embodiment shown;

[0041] Figure 15 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application.

[0042] Figure label:

[0043] Top cover 100, inner side 110, outer side 120, mounting hole 130;

[0044] The pole terminal 200, the base part 210, the through part 220, the second connecting part 221, and the buckle 230;

[0045] Thermal conductive component 300, thermal conductive surface 310, connecting hole 320, hole wall of connecting hole 321, first connecting part 322, snap groove 330, snap-fit ​​section 331, guide section 332, limiting part 333, receiving groove 334, thermally conductive potting compound 340.

[0046] Seal 400, lower insulation 500, recess 510, through hole 520;

[0047] Explosion-proof component 600, liquid injection component 700, housing 800, opening 810. Detailed Implementation

[0048] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0049] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] In the description of this application, "several" means "more than one," and "above," "below," "within," etc., are understood to include the stated number. If "first," "second," etc., are used only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0051] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0052] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Current single-cell batteries often suffer from heat accumulation and large temperature differences within the cell during charging and discharging, affecting their charge / discharge performance. Research has found that one reason for this is that conventional single-cell batteries use an insulated and sealed method to mount the bare cells, internal conductive components, and terminals to the casing, relying on a cooling system for heat exchange with the casing. However, the low thermal conductivity of the common insulating materials used makes it difficult for the heat released during charging and discharging to be quickly transferred to the casing, leading to heat accumulation within the cell and impacting charge / discharge performance. On the other hand, the terminals and internal conductive connectors generate significant heat during charging and discharging, creating large temperature differences within the cell and resulting in poor temperature uniformity, further affecting charge / discharge performance. To address this, this application provides a top cover assembly and a single-cell battery that can conduct heat from the terminals to the top cover, improving the heat conduction efficiency within the cell and at the terminals, thus effectively solving the aforementioned problems. This application also provides a battery pack incorporating this single-cell battery, which can be used as a power battery in various electrical devices and exhibits excellent charge / discharge performance.

[0054] Figure 1 This is a schematic diagram of the top cover assembly according to an embodiment of this application. Figure 2 for Figure 1 A cross-sectional view of the top cover assembly along section AA of one embodiment. Figure 3 for Figure 2 A magnified view of section B in the diagram, for reference. Figures 1 to 3The top cover assembly according to the first aspect of this application includes a top cover 100, a terminal post 200, and a heat-conducting element 300. The top cover 100 has an inner side 110 and an outer side 120, and a mounting hole 130 is provided on the top cover 100 through the inner side 110 and the outer side 120. The terminal post 200 includes a base portion 210 and a through portion 220. The base portion 210 is located on the inner side 110 of the top cover 100, and the through portion 220 protrudes from one side of the base portion 210. The through portion 220 passes through the mounting hole 130 and extends to the outer side 120 of the top cover 100. The heat-conducting element 300 is located on the outer side 120 of the top cover 100 and connected to the through portion 220, thereby confining the top cover 100 between the heat-conducting element 300 and the base portion 210, thereby fixing the terminal post 200 to the top cover 100. Furthermore, the heat-conducting component 300 has a heat-conducting surface 310 on the side facing the top cover 100. This heat-conducting surface 310 abuts against the top cover 100 and is used for heat transfer between the through portion 220 and the top cover 100. It can transfer the heat inside the single battery and the heat generated by the terminal 200 to the top cover 100. Thus, in the top cover assembly of this application embodiment, the heat-conducting component 300 can both fix the terminal 200 and conduct heat to the terminal 200. When applied to a single battery, during charging or discharging, the terminal 200 and the adapter used for conductive connection inside the single battery generate significant heat. The heat-conducting component 300 can transfer the heat inside the single battery and the heat generated by the terminal 200 to the top cover 100, thereby improving heat dissipation efficiency and effectively solving the problem of heat accumulation and large temperature difference inside the single battery. When applied to a single battery, it helps to realize the fast charging and high-rate discharge functions of the single battery.

[0055] Figure 4 for Figure 2 An exploded view of the top cover assembly of the embodiment shown. Figure 5 for Figure 2 An exploded view of the heat-conducting element 300 and the pole terminal 200 of the top cover assembly in the illustrated embodiment. Figure 6 for Figure 5 A schematic diagram of the structure of the top cover assembly after the heat-conducting component 300 and the pole terminal 200 are assembled, see reference. Figures 4 to 6In some embodiments, the heat-conducting element 300 is provided with a connecting hole 320. The heat-conducting element 300 is sleeved on the outer wall of the through portion 220 through the connecting hole 320. The hole wall 321 of the connecting hole abuts against the through portion 220, thereby bridging the heat-conducting element 300 and the top cover 100, enabling heat transfer between the through portion 220 and the top cover 100. The heat-conducting element 300 is provided with a first connecting portion 322 on the hole wall 321 of the connecting hole, and a second connecting portion 221 is provided on the outer wall of the through portion 220. The first connecting portion 322 and the second connecting portion 221 are detachably connected. Thus, the heat-conducting element 300 can be installed on the pole terminal 200 and the pole terminal 200 can be fixed on the top cover 100, thus having the functions of heat conduction and connection.

[0056] In the above embodiments, the first connecting portion 322 of the heat-conducting component 300 and the second connecting portion 221 of the through portion 220 can be detachably connected by means of snap-fit, threaded connection, etc. The following are some embodiments in which the first connecting portion 322 and the second connecting portion 221 are detachably connected by snap-fit:

[0057] Figure 7 for Figure 5 A schematic diagram of the structure of the pole terminal 200 in the top cover assembly of the embodiment shown. Figure 8 for Figure 5 A schematic diagram of the structure of the heat-conducting element 300 in the top cover assembly of the embodiment shown is provided. Figures 5 to 8In some embodiments of the top cover assembly, the second connecting portion 221 on the through portion 220 includes a plurality of latches 230. The latches 230 protrude from the outer wall of the through portion 220 at a set height. The first connecting portion 322 of the heat-conducting element 300 includes a plurality of latching grooves 330 that engage with the latches 230. The latching grooves 330 are recessed from the hole wall 321 of the connecting hole at a set depth. The latches 230 are detachably engaged with the latching grooves 330, thereby realizing a detachable connection between the heat-conducting element 300 and the through portion 220. It can be understood that a portion of heat transfer can also occur between the heat-conducting element 300 and the through portion 220 at the connection point of the latches 230 and the latching grooves 330. In some embodiments, the through portion 220 of the pole terminal 200 may be cylindrical, and the mounting hole 130 of the heat-conducting element 300 may be circular. The hole wall 321 of the connecting hole abuts against the outer wall of the through portion 220 to achieve heat conduction. The latching groove 330 includes a snap-fit ​​section 331 and a guide section 332 that are interconnected. The snap-fit ​​section 331 extends circumferentially along the through portion 220 for a set length. Along the axial direction of the through portion 220, the guide section 332 extends from the groove wall of the snap-fit ​​section 331 toward the end face of the through portion 220 in a direction away from the base portion 210. During assembly, the guide member is inserted into the through portion 220 axially, and the latch 230 can enter the guide section 332 and enter the snap-fit ​​section 331 through the relative rotation between the heat-conducting member 300 and the through portion 220, thereby realizing the snap-fit ​​between the guide member and the through portion 220. It can also axially restrict the position of the pole terminal 200 and fix the pole terminal 200 and the top cover 100. The structure is simple and the snap-fit ​​is stable, which helps to facilitate rapid assembly.

[0058] It should be noted that the height of the protrusion of the buckle 230 and the depth of the recess of the groove 330 can be reasonably set according to the size of the through portion 220 of the heat-conducting component 300 and the pole terminal 200, as well as the assembly requirements. The number of buckles 230 can be one, two, three or more. Multiple buckles 230 can be arranged circumferentially around the outer wall of the through portion 220. The number of grooves 330 on the heat-conducting component 300 is equal to the number of buckles 230. Each buckle 230 is engaged with each groove 330 in a one-to-one correspondence. In this embodiment, the number of buckles 230 and grooves 330 is four. The buckles 230 are evenly distributed on the outer periphery of the through portion 220, and the position of the grooves 330 corresponds to the buckles 230 in a one-to-one correspondence. This allows the heat-conducting component 300 to be connected to the through portion 220 at four positions around the through portion 220, ensuring the stability of the connection.

[0059] Figure 9 for Figure 1 A cross-sectional view of the top cover assembly along section AA of another embodiment. Figure 10 for Figure 9 A magnified view of part C in the diagram. Figure 11 for Figure 9 An exploded view of the heat-conducting element 300 and the pole terminal 200 of the top cover assembly in the illustrated embodiment. Figure 12 for Figure 11 A schematic diagram of the structure of the top cover assembly after the heat-conducting component 300 and the pole terminal 200 are assembled, see reference. Figures 9 to 12 In some other embodiments, the positions of the buckle 230 and the slot 330 in the above embodiments can be interchanged. That is, the first connecting part 322 on the heat-conducting component 300 includes a plurality of buckles 230, the buckles 230 protruding from the hole wall 321 of the connecting hole at a set height, and the second connecting part 221 on the through part 220 of the pole terminal 200 includes a plurality of slots 330 that engage with the buckles 230. The slots 330 are recessed from the outer wall of the through part 220 at a set depth, and the buckles 230 are detachably engaged with the slots 330. The buckles 230 and the slots 330 in this embodiment are similar to those in the above embodiments, which can realize the detachable connection between the heat-conducting component 300 and the through part 220. A portion of the heat can also be transferred between the heat-conducting component 300 and the through part 220 at the connection between the buckles 230 and the slots 330.

[0060] Similar to the previous embodiments, the snap-fit ​​groove 330 in this embodiment may also include a guide section 332 and a snap-fit ​​section 331. Figure 13 for Figure 11 A schematic diagram of the structure of the pole terminal 200 in the top cover assembly of the embodiment shown. Figure 14 for Figure 11 A schematic diagram of the structure of the heat-conducting element 300 in the top cover assembly of the embodiment shown is provided. Figure 13 and Figure 14 The through portion 220 of the pole terminal 200 can be cylindrical, and the mounting hole 130 of the heat conductor 300 can be circular. The hole wall 321 of the connecting hole abuts against the outer wall of the through portion 220 to achieve heat conduction. The latching groove 330 includes a snap-fit ​​section 331 and a guide section 332 that are interconnected. The snap-fit ​​section 331 extends a set length along the axial direction of the connecting hole 320. Along the axial direction of the connecting hole 320, the guide section 332 extends from the groove wall of the snap-fit ​​section 331 toward the top cover 100 to the heat-conducting surface 310. During assembly, the guide member is inserted into the through part 220 along the axial direction. The latch 230 can enter the guide section 332 and enter the snap-fit ​​section 331 through the relative rotation between the heat-conducting member 300 and the through part 220, thereby realizing the snap-fit ​​between the guide member and the through part 220. It can also axially restrict the position of the pole terminal 200 and fix the pole terminal 200 and the top cover 100. The structure is simple and the snap-fit ​​is stable, which helps to facilitate rapid assembly.

[0061] It should be noted that the height of the protrusion of the buckle 230 on the heat-conducting component 300 and the depth of the recess of the groove 330 on the through portion 220 can be reasonably set according to the size of the heat-conducting component 300 and the through portion 220 of the pole terminal 200 and the assembly requirements. The number of buckles 230 can be 1, 2, 3 or more. Multiple buckles 230 can be arranged circumferentially around the hole wall 321 of the connecting hole of the heat-conducting component 300. The number of grooves 330 on the through portion 220 is equal to the number of buckles 230. Each buckle 230 is engaged with each groove 330 in a one-to-one correspondence. In this embodiment, the number of buckles 230 and grooves 330 is 4. The buckles 230 are evenly distributed circumferentially on the hole wall 321 of the connecting hole. The position of the grooves 330 corresponds to the buckles 230 in a one-to-one correspondence, so that the heat-conducting component 300 can be connected to the through portion 220 at four positions around the through portion 220 to ensure the stability of the connection.

[0062] In the above embodiments, reference is made to Figure 8 and Figure 13 Regardless of whether the retaining groove 330 is provided in the heat-conducting component 300 or the through portion 220, the guide section 332 of the retaining groove 330 is connected to one end of the locking section 331 in the length direction. A limiting part 333 is also provided on the groove wall of the locking section 331 connected to the guide section 332. The limiting part 333 protrudes from the groove wall, and its protruding direction is opposite to the extending direction of the guide section 332. For example: (Refer to...) Figure 8 The guide portion extends from the groove wall of the locking section 331 adjacent to the heat-conducting surface 310 toward the heat-conducting surface 310, and the limiting portion 333 protrudes from the groove wall in a direction away from the heat-conducting surface 310; or, refer to Figure 13 The guide portion extends from the groove wall of the snap-fit ​​section 331 away from the base portion 210 in a direction away from the base portion 210, and the limiting portion 333 protrudes from the groove wall in a direction closer to the base portion 210. The limiting portion 333 and the end wall of the snap-fit ​​section 331 at the other end of the guide portion 332 define a receiving groove 334. The receiving groove 334 can accommodate the buckle 230. Therefore, the limiting portion 333 can limit the buckle 230 in the length direction of the snap-fit ​​section 331, preventing the buckle 230 from disengaging from the snap-fit ​​section 331 and sliding out of the guide portion 332.

[0063] It should be noted that in the above embodiments, the number of slots 330 can also be greater than the number of buckles 230. It is necessary to ensure that each buckle 230 has a corresponding slot 330 for snapping, and the remaining slots 330 can be left empty. Having more slots 330 than snap fasteners 230 increases the number of correct snap-fit ​​positions for the heat-conducting component 300, improving assembly efficiency. For example, when there is one snap fastener 230 and multiple slots 330, each snap fastener 230 can snap into any slot 330, resulting in more correct snap-fit ​​positions for the heat-conducting component 300. This reduces the time spent finding the correct position during assembly, thus improving assembly efficiency. Alternatively, when there are two snap fasteners 230 and multiples of slots 330 (e.g., four, six, or more than two slots), taking four slots 330 as an example, any two slots 330 can be matched one-to-one with a snap fastener 230. Therefore, each snap fastener 230 can snap into any pair of slots 330, resulting in more correct snap-fit ​​positions for the heat-conducting component 300. This reduces the time spent finding the correct position during assembly, thus improving assembly efficiency.

[0064] In some embodiments, reference Figure 3 and Figure 4 A sealing element 400 is provided between the top cover 100 and the pole terminal 200. The sealing element 400 abuts against the inner surface of the top cover 100 and the base portion 210, achieving a sealed connection between the top cover 100 and the base portion 210. Alternatively, the sealing element 400 abuts against the through portion 220 and the wall of the mounting hole 130, achieving a sealed connection between the top cover 100 and the through portion 220. Or, a portion of the sealing element 400 abuts against the inner surface of the top cover 100 and the base portion 210, and another portion abuts against the through portion 220 and the wall of the mounting hole 130, thereby achieving a sealed connection between the top cover 100 and the through portion 220 and the base portion 210 of the pole terminal 200. In some embodiments, reference is made to... Figure 3 , Figure 8 , Figure 10 and Figure 13The sealing element 400 is made of an elastic material and is annular, which can be fitted onto the through portion 220. The sealing element 400 may include a first sealing portion 410 and a second sealing portion 420. The first sealing portion 410 and the second sealing portion 420 are annular, coaxially arranged, and interconnected. The outer diameter of the first sealing portion 410 is larger than the outer diameter of the second sealing portion 420. Therefore, the first sealing portion 410 protrudes radially from the outer surface of the second sealing portion 420 by a set height, resulting in an approximately L-shaped cross-section for both the first sealing portion 410 and the second sealing portion 420. During assembly, the first sealing portion 410 abuts against the inner surface of the top cover 100 and the base portion 210, achieving a sealed connection between the top cover 100 and the base portion 210. The second sealing portion 420 abuts against the through portion 220 and the wall of the mounting hole 130, achieving a sealed connection between the top cover 100 and the through portion 220. Furthermore, since the first sealing part 410 is pressed between the inner surface of the top cover 100 and the base part 210, the elastic force of the first sealing part 410 can cause the base part 210 to tend to move away from the top cover 100. A tight connection can be maintained between the through part 220 and the first connecting part 322 and the second connecting part 221 that are interconnected on the heat-conducting member 300. For example, in some of the embodiments described above, this elastic force can keep the buckle 230 abutting against the groove wall of the buckle groove 330, thereby preventing disengagement. In embodiments where a limiting part 333 is provided in the buckle groove 330, when the buckle 230 enters the snap-fit ​​section 331 through the guide section 332 of the buckle groove 330 and rotates to the receiving groove 334 position, this elastic force can pull the buckle 230 into the receiving groove 334 and keep it in the receiving groove 334 under the action of the elastic force, effectively preventing the buckle 230 from disengaging from the buckle groove 330. During assembly, the through portion 220 of the pole terminal 200 passes through the corresponding mounting hole 130 from the inner side 110 of the top cover 100. The heat-conducting component 300 is fitted into the through portion 220 of the pole terminal 200 on the outer side 120 of the top cover 100. When the heat-conducting surface 310 of the heat-conducting component 300 is in contact with the outer surface of the top cover 100, the heat-conducting component 300 is rotated at a certain angle so that the buckle 230 rotates to the position of the receiving groove 334. At this time, the rebound force of the sealing component 400 pulls the pole terminal 200 towards the inner side 110 of the top cover 100, so that the buckle 230 falls into the receiving groove 334. The limiting portion 333 can prevent the buckle 230 from moving along the length direction of the snap-fit ​​section 331, so as to achieve a stable and reliable fixing effect.

[0065] In the above embodiments, reference is made to Figure 3 and Figure 10A thermally conductive potting compound 340 can be filled between the heat-conducting component 300 and the through portion 220 to absorb manufacturing deviations, ensure good contact between the heat-conducting component 300 and the through portion 220, and thus ensure the thermal conductivity. A high-viscosity thermally conductive potting compound can be used, dripped onto the through portion 220 before assembling the heat-conducting component 300 and the through portion 220, and then the heat-conducting component 300 is assembled onto the through portion 220, pressing the thermally conductive potting compound 340 between the heat-conducting component 300 and the through portion 220. Alternatively, a low-viscosity thermally conductive potting compound can be used, dripped between the heat-conducting component 300 and the through portion 220 after assembling the through portion 220. In some embodiments described above, refer to... Figure 10 and Figure 13 The thermally conductive potting compound 340 can be dripped into the space between the thermally conductive component 300 and the through portion 220 through the guide section 332 of the groove 330. The guide section 332 of the groove 330 has the function of guiding the thermally conductive potting compound 340.

[0066] Typically, the top cover assembly includes two terminal blocks 200, serving as a positive terminal block and a negative terminal block, respectively. In the top cover assembly of this application embodiment, reference is made to... Figure 1 Each terminal 200 is provided with a heat-conducting element 300. Both heat-conducting elements 300 can be made of insulating material to achieve insulation between the positive terminal, negative terminal, and top cover 100. Alternatively, one heat-conducting element 300 can be made of insulating material and connected to the negative terminal, while the other heat-conducting element 300 is made of conductive material and connected to the positive terminal, achieving conductive connection between the positive terminal and the top cover. This conductive element has a set resistance value, ranging from 0.1 to 2 Mohm. When the resistance is selected between 1 and 10000 ohms, the conductive element exhibits good electrical and thermal conductivity as well as corrosion resistance. The aforementioned insulating material can be selected from high thermal conductivity insulating materials, such as high-purity ceramics, which have good insulation performance and thermal conductivity, and also have high strength. Therefore, the heat-conducting component 300 can achieve efficient heat conduction while also having good dimensional stability and weather resistance. The heat-conducting component 300 has high strength and can still ensure good thermal conductivity, insulation and sealing effect of the terminal 200 under long-term operation of the single cell.

[0067] refer to Figure 3 , Figure 4 and Figure 10The inner side 110 of the top cover 100 is also provided with a lower insulating member 500. One side of the lower insulating member 500 abuts against the inner surface of the top cover 100, and the other side is provided with a recessed portion 510 that is recessed towards the top cover 100. The recessed portion 510 is used to accommodate the base portion 210 of the pole terminal 200. The lower insulating member 500 is provided with a through hole 520 in the recessed portion 510 for the pole terminal 200 to pass through. During assembly, The sealing element 400 and the lower insulating element 500 are fitted onto the through portion 220 of the pole terminal 200. All three are then inserted from the inner side 110 of the top cover 100 into the corresponding mounting holes 130. The heat-conducting element 300 is connected to the through portion 220 of the pole terminal 200 from the outer side 120 of the top cover 100, with the heat-conducting surface 310 of the heat-conducting element 300 abutting against the outer surface of the top cover 100, achieving a stable and reliable fixing effect. Additionally, the top cover 100 may also be equipped with commonly used components such as an explosion-proof component 600 and a liquid injection component 700.

[0068] Figure 15 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application. (Refer to...) Figure 15 In conjunction with the foregoing embodiments, the single-cell battery of the second aspect of this application includes a housing 800, a bare cell (not shown), and the top cover assembly of the first aspect embodiment described above. The housing 800 has an inner cavity and an opening 810 communicating with the inner cavity. The bare cell is housed within the inner cavity, and a tab is provided on the side of the bare cell facing the opening 810. The top cover 100 of the top cover assembly is connected to the housing 800 and seals the opening 810 of the housing 800. The inner side 110 of the top cover 100 faces the inner cavity of the housing 800. The base portion 210 of the terminal 200 is located within the inner cavity, and a through portion 220 extends from the mounting hole 130 of the top cover 100 to the outer side 120 of the top cover 100. The terminal 200 is electrically connected to the tab of the bare cell within the inner cavity. The heat-conducting element 300 on the top cover assembly can be used to transfer heat between the through portion 220 of the terminal 200 and the top cover 100. Therefore, the heat inside the single cell and the heat generated by the terminal 200 can be transferred from the terminal 200 to the top cover 100, which effectively improves the heat dissipation efficiency and avoids the problem of heat accumulation and large temperature difference inside the single cell, thereby helping to improve the charging and discharging performance of the single cell.

[0069] The battery pack (not shown) of the third aspect of this application includes a housing and a plurality of individual batteries as described in the second aspect of the application. The individual batteries are housed in the housing. As can be seen from the above, the individual batteries in the battery pack of this embodiment effectively solve the problems of internal heat accumulation and large temperature difference, thereby helping to improve the overall charging and discharging performance of the battery pack.

[0070] The top cover assembly, single cell, and battery pack of this application embodiment can be applied to new energy power batteries. With the development of new energy power batteries, they are widely used as power sources in various electrical devices, such as electric vehicles, electric trains, and electric bicycles. The demand for fast charging and high-rate discharging of power batteries is also increasing daily. As described above, the top cover assembly, single cell, and battery pack of this application embodiment enable rapid heat diffusion from the terminal 200 and the inside of the single cell to the top cover 100, improving heat conduction and heat dissipation efficiency, thereby enhancing the battery's charge and discharge performance. This meets the requirements for fast charging and high-rate discharging of power batteries and helps optimize the user experience of electrical devices.

[0071] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A top cover assembly, characterized in that, include: A top cover has opposing inner and outer sides, and the top cover is provided with mounting holes that pass through the inner and outer sides; The pole terminal includes a base portion and a through portion, the through portion protruding from one side of the base portion, the base portion being located on the inner side of the top cover, the through portion passing through the mounting hole and extending to the outer side of the top cover, the base portion and / or the through portion being connected to the top cover at the mounting hole; A heat-conducting component is located on the outside of the top cover and connected to the through portion. The heat-conducting component has a heat-conducting surface on the side facing the top cover, and this surface abuts against the top cover for heat transfer between the through portion and the top cover; wherein: The heat-conducting component is provided with a connecting hole, which is a circular hole structure. The heat-conducting component is sleeved on the outer wall of the through part through the connecting hole. The hole wall of the connecting hole abuts against the through part. The heat-conducting component is provided with a first connecting part on the hole wall of the connecting hole. The first connecting part includes several buckles, which protrude from the hole wall of the connecting hole at a set height. The through portion has a cylindrical structure, and a second connecting portion is provided on the outer wall of the through portion. The second connecting portion includes a plurality of latching grooves that engage with the buckle. The latching grooves are recessed from the outer wall of the through portion to a predetermined depth. Each latching groove includes an engaging section and a guide section that communicate with each other. The engaging section extends a predetermined length circumferentially along the through portion and extends axially along the through portion. The guide section extends from the groove wall of the engaging section in a direction away from the base portion to the end face of the through portion. The buckle can enter the guide section and enter the engaging section through the relative rotation between the heat-conducting member and the through portion. The buckle is detachably latched onto the latching groove, so that the first connecting portion and the second connecting portion are detachably connected. The space between the heat-conducting component and the through portion is filled with thermally conductive potting compound. The thermally conductive potting compound is dripped into the space between the heat-conducting component and the through portion through the guide section of the groove. The guide section of the groove has a guiding effect on the thermally conductive potting compound.

2. The top cover assembly according to claim 1, characterized in that, The guide section is connected to one end of the snap-fit ​​section along its length. A limiting part is also provided on the groove wall of the snap-fit ​​section connected to the guide section. The limiting part protrudes from the groove wall. A receiving groove is defined between the limiting part and the end wall of the snap-fit ​​section at the other end of the guide section. The receiving groove can accommodate the buckle.

3. The top cover assembly according to claim 1, characterized in that, A sealing element is provided between the top cover and the pole terminal. The sealing element is annular and includes a first sealing part and a second sealing part coaxially arranged. The outer diameter of the first sealing part is larger than the outer diameter of the second sealing part. The first sealing part abuts against the inner surface of the top cover and the base part. The second sealing part is connected to the side of the first sealing part away from the base part and abuts against the through part and the wall of the mounting hole.

4. The top cover assembly according to any one of claims 1 to 3, characterized in that, The top cover assembly includes two pole terminals, each of which is provided with a heat-conducting element, wherein: both heat-conducting elements are made of insulating material; or, one of the heat-conducting elements is made of insulating material, and the other heat-conducting element is a conductive element made of conductive material, and the conductive element has a set resistance value.

5. A single-cell battery, characterized in that, include: The housing has an inner cavity and an opening communicating with the inner cavity; A bare battery cell is housed in the inner cavity, and the bare battery cell has a tab on the side facing the opening; as well as, The top cover assembly according to any one of claims 1 to 4, wherein the top cover is connected to the housing and seals the opening, the inner side of the top cover faces the inner cavity, and the pole terminal is electrically connected to the pole tab.

6. A battery pack, characterized in that, It includes a housing and a plurality of individual batteries as described in claim 5, wherein the individual batteries are housed in the housing.

Images