Battery top cover assembly

Abstract

The utility model relates to a battery top cover assembly, which comprises a pole, a top cover and a top cover, a pole hole is formed in the top cover plate, the pole covers the pole hole, one end, facing the interior of the pole hole, of the pole is used for being connected with a battery cell, one end, far away from the pole hole, of the pole is used for being connected with external equipment, and a clamping piece is arranged on the top cover plate; the upper plastic is arranged between the top cover piece and the fixing piece and used for limiting the positions of the fixing piece and the clamping piece. The fixing piece is arranged to abut against the pole, the upper plastic is arranged between the top cover piece and the fixing piece so as to limit the positions of the fixing piece and the clamping piece on the top cover piece, and a limiting force for preventing the pole from twisting can be applied to the pole, so that the pole can be effectively prevented from rotating in a horizontal plane, the pole is fixed more stably, and the service life of the pole is prolonged. The stress capacity in all directions is enhanced, the anti-rotation performance is improved, and the torsional strength is enhanced.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery top cover assembly. Background Technology

[0002] The top cover assembly, as a crucial component of the power battery, serves multiple functions, including sealing, integrating the electrolyte filling port, integrating the explosion-proof valve, and transmitting conductive current. The terminal block assembly, as the component within the top cover assembly responsible for transmitting conductive current, has a significant impact on the battery's capacity, energy density, electrothermal properties, and safety performance.

[0003] During the assembly of the battery cover, preventing the terminals from rotating is extremely important. If the terminals can rotate relative to the top cover after installation, it will not only affect subsequent welding processes but also the normal use of the battery. In existing technologies, preventing the terminals from rotating is usually achieved by pressing and fitting upper plastic parts or seals together. However, this tight-fitting structure is not very effective at preventing rotation. Utility Model Content

[0004] Therefore, it is necessary to address the problem that the anti-rotation of the terminal post in the existing technology is usually achieved by pressing and fitting the upper plastic part or the sealing part, and the anti-rotation effect of this pressing and fitting structure is not good. In this regard, a battery terminal post, top cover and battery are provided.

[0005] In a first aspect, this application provides a battery top cover assembly, comprising:

[0006] A pole post, on which a fixing component is provided;

[0007] A top cover sheet has a terminal hole, the terminal is covered on the terminal hole, one end of the terminal facing into the terminal hole is used to connect to the battery cell, and the other end of the terminal away from the terminal hole is used to connect to an external device. A snap-fit ​​component is provided on the top cover sheet.

[0008] A plastic layer is placed between the top cover and the fixing member to restrict the position of the fixing member and the snap-fit ​​member.

[0009] In one embodiment, the fastener includes a pressing section disposed on the outer edge of the pole post, a gap is formed between the pressing section and the outer edge of the pole post, the gap is filled with the upper plastic, and the upper plastic and the pressing section are pressed together.

[0010] In one embodiment, the pressing section is provided in two locations, spaced apart.

[0011] In one embodiment, the snap-fit ​​component has a notch for the pressing section to extend into, and the upper plastic fills the space between the snap-fit ​​component and the pressing section, so that the snap-fit ​​component and the pressing section snap into each other.

[0012] In one embodiment, the size of the snap-fit ​​element is not smaller than that of the pressing section.

[0013] In one embodiment, the snap-fit ​​member includes a support portion and an abutment portion, wherein one end of the support portion is connected to the top cover plate, the other end of the support portion is connected to the abutment portion, and the abutment portion extends toward the center of the pole post from the end away from the support portion, such that the pressing section overlaps with the projection of the abutment portion on the plane of the top cover plate.

[0014] In one embodiment, the snap-fit ​​component has a plurality of through holes spaced apart, and the upper plastic fills the through holes.

[0015] In one embodiment, a sealing ring is provided between the pole post and the top cover plate to seal the pole post and the pole post hole.

[0016] In one embodiment, the top cover is provided with an explosion-proof valve, the explosion-proof valve is provided with a protective film, and the protective film is provided with an exhaust hole.

[0017] In one embodiment, the top cover further includes a lower plastic component disposed on the side of the top cover away from the upper plastic component, and the lower plastic component is connected to the top cover.

[0018] Secondly, this application provides a method for installing a battery top cover assembly, applicable to any of the battery top cover assemblies provided in the first aspect above. The method for installing the battery top cover assembly includes:

[0019] Place the sealing ring into the support protrusion of the pole hole on the top cover plate, then place the pole cover on the pole hole, and snap the pressing part of the pressing pole 100 into place with the snap fastener.

[0020] Inject top plastic into the snap-fit ​​component. The top plastic fills the gaps in the terminal post, through holes, and other gaps to restrict the relative movement between the terminal post and the top cover plate.

[0021] The battery top cover assembly described above features a fixing member on the terminal post, with plastic spaced between the top cover and the fixing member to restrict the position of the fixing member and the snap-fit ​​parts on the top cover. This applies a limiting force to the terminal post to prevent torsion, effectively preventing rotation of the terminal post in the horizontal plane and making the post more securely fixed. This enhances its load-bearing capacity in all directions, improves anti-rotation performance, and strengthens torsional strength. Furthermore, it effectively prevents rotation of the terminal post relative to the top cover, facilitating subsequent welding processes and improving the manufacturing yield of the battery top cover assembly. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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 these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the battery top cover assembly in some embodiments of this application;

[0024] Figure 2 This is an exploded view of the battery top cover assembly in some embodiments of this application;

[0025] Figure 3 This is a cross-sectional schematic diagram of the battery top cover assembly in some embodiments of this application;

[0026] Figure 4 for Figure 3 An enlarged schematic diagram of a partial cross-section of the battery top cover assembly.

[0027] Explanation of icon numbers:

[0028] 1. Battery top cover assembly; 100. Terminal post; 100a. Positive terminal post; 100b. Negative terminal post; 110. Fixing component; 111. Pressing section; 112. Empty section; 200. Top cover piece; 210. Terminal post hole; 211. Supporting protrusion ring; 220. Snap-fit ​​component; 221. Notch section; 222. Support part; 223. Abutting part; 231. Protective film; 232. Vent hole; 300. Upper plastic part; 400. Sealing ring; 500. Lower plastic part. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] In existing technologies, anti-rotation of the electrode post is usually achieved through the compression fit of the upper plastic part or sealing part, but this compression fit structure is not very effective at preventing rotation. To address this problem, firstly, referring to... Figure 1 and Figure 2 One embodiment of this application provides a battery top cover assembly 1, including a terminal post 100 for inputting or outputting current inside the battery, a fixing member 110 for preventing the terminal post 100 from rotating; a top cover sheet 200 for encapsulating the internal components of the battery, a terminal post hole 210 for the top cover sheet 200, the terminal post 100 covering the terminal post hole 210, one end of the terminal post 100 facing into the terminal post hole 210 for connecting to a battery cell, and the other end of the terminal post 100 away from the terminal post hole 210 for connecting to an external device, a snap-fit ​​member 220 for the top cover sheet 200; and an upper plastic 300 disposed between the top cover sheet 200 and the fixing member 110 for limiting the position of the fixing member 110 and the snap-fit ​​member 220.

[0036] Among them, the terminal 100 is an important component of the battery, usually referring to the connection terminal of the positive and negative terminals of the battery. The terminal 100 is the key node for converting the internal chemical energy of the battery into electrical energy and transmitting electrical energy to external devices. The terminal 100 is the connection point between the battery and external devices. Through the terminal 100, the electrical energy generated in the battery can be transferred to the external devices. Typically, the terminal 100 can include a positive terminal 100a and a negative terminal 100b.

[0037] It is worth mentioning that the battery includes a casing and a battery cell. The top of the casing is open, and the battery cell is housed inside the casing. The casing provides good support and protection for the battery cell. The battery cell is the core component of the battery, responsible for storing and releasing electrical energy, while the terminal 100 is the terminal for connecting the battery to external devices. The positive and negative terminals of the battery cell are connected to the positive terminal 100a and the negative terminal 100b, respectively. The battery also includes the battery top cover assembly 1 disclosed in this embodiment. The battery top cover assembly 1 is located at the open end of the casing, and the battery top cover assembly 1 and the casing form a sealed space, which serves to encapsulate the battery cell.

[0038] Reference Figure 1 and Figure 2 The battery top cover assembly 1 includes two terminals 100, one of which is a positive terminal 100a and the other is a negative terminal 100b. The positive terminal of the battery cell is connected to the positive terminal 100a, and the negative terminal of the battery cell is connected to the negative terminal 100b. The top surface of the terminal 100 is connected to an external device, enabling the battery cell to supply power to the external device.

[0039] In this embodiment, a fixing member 110 is provided on the terminal post 100 of the battery top cover assembly 1, and a plastic 300 is provided between the top cover plate 200 and the fixing member 110 to restrict the position of the fixing member 110 and the snap-fit ​​member 220 on the top cover plate 200. A limiting force can be applied to the terminal post 100 to prevent it from twisting, thereby effectively preventing the terminal post 100 from rotating in the horizontal plane, making the fixing of the terminal post 100 more stable, enhancing its force-bearing capacity in all directions, improving anti-rotation performance, and enhancing torsional strength. It can also better prevent the phenomenon of the terminal post 100 rotating relative to the top cover plate 200, facilitating subsequent welding processes, thereby improving the manufacturing yield of the battery top cover assembly 1.

[0040] Reference Figure 2 and Figure 3 In some embodiments, the fastener 110 includes a pressing section 111 disposed on the outer edge of the pole post 100, and a gap section 112 matching the number of pressing sections 111 is formed between the pressing section 111 and the outer edge of the pole post 100. The gap section 112 is filled with upper plastic 300, and the upper plastic 300 abuts against the pressing section 111.

[0041] The electrode post 100 has at least one pressing section 111 and at least one empty section 112 on its main body edge. The empty section 112 is used to accommodate the upper plastic 300, and the material of the upper plastic 300 is preferably PPS.

[0042] Specifically, the number of pressing sections 111 and empty sections 112 on the main body edge of the pole post 100 are matched. Two pressing sections 111 and two corresponding empty sections 112 can be provided, or three pressing sections 111 and three corresponding empty sections 112 can be provided. The number of pressing sections 111 and empty sections 112 is not limited. The pressing sections 111 can be used to restrict the vertical movement of the pole post 100, and the empty sections 112, after being filled with plastic 300, can be used to restrict the horizontal rotation of the pole post 100.

[0043] Preferably, there are two pressing sections 111, which are spaced apart and have a gap section 112 between them. Further, the two pressing sections can be arranged symmetrically.

[0044] In this embodiment, the vertical movement of the terminal post 100 is restricted by the pressing section 111, while the horizontal rotation of the terminal post 100 is restricted by the structure of filling the empty section 112 with plastic 300, thus preventing the terminal post 100 from twisting. This effectively prevents the terminal post 100 from rotating in the horizontal plane, makes the terminal post 100 more securely fixed, enhances its load-bearing capacity in all directions, improves anti-rotation performance, and enhances torsional strength. Furthermore, it effectively prevents the terminal post 100 from rotating relative to the top cover plate 200, facilitating subsequent welding processes and thereby improving the manufacturing yield of the battery top cover assembly 1.

[0045] Reference Figure 2 In some embodiments, the snap-fit ​​member 220 has a notch 221 for the pressing section 111 to extend into, and the upper plastic 300 is filled between the snap-fit ​​member 220 and the pressing section 111 so that the snap-fit ​​member 220 and the pressing section 111 snap-fit ​​together.

[0046] The snap-fit ​​element 220 is disposed on the top cover plate 200 and is used to snap the edge of the snap-fit ​​terminal 100 to fix the terminal 100. The snap-fit ​​element 220 may have a notch section 221 for the pressing section 111 of the terminal 100 to extend into. The number of notches 221 can be the same as the number of empty sections 112 on the terminal 100. Furthermore, the size of the snap-fit ​​element 220 can be greater than or equal to the pressing section 111, thereby enabling the snap-fit ​​element 220 to press against the pressing section 111.

[0047] In some embodiments, the snap-fit ​​member 220 may include a support portion 222 and an abutment portion 223. One end of the support portion 222 is connected to the top cover plate 200, and the other end of the support portion 222 is connected to the abutment portion 223. The end of the abutment portion 223 away from the support portion 222 extends toward the center of the pole post 100, such that the pressing section 111 overlaps with the projection of the abutment portion 223 on the plane of the top cover plate 200. Based on the above structure, the pressing section 111 can be snapped and pressed together by the abutment portion 223 and the support portion 222, thereby effectively limiting the vertical movement space of the pole post 100.

[0048] Specifically, the snap-fit ​​component 220 can be in the form of an arc-shaped inward-turned component, which surrounds the pole hole 210. The notch segment 221 divides the arc-shaped inward-turned component into several arc-shaped inward-turned sub-segments, and the number of arc-shaped inward-turned sub-segments matches the notch segment 221. The arc length corresponding to the notch segment 221 is not greater than the arc length corresponding to the arc-shaped inward-turned sub-segments.

[0049] Furthermore, a support ring 211 may be provided on the inner wall of the pole post hole 210, extending radially inward toward the pole post hole 210. The support ring 211 can be used to support the pressing section 111 of the pole post 100 after the pole post 100 is covered.

[0050] In some embodiments, the snap-fit ​​component 220 has a plurality of through holes spaced apart, and the upper plastic 300 fills the through holes. Specifically, during the filling process of the upper plastic 300, the upper plastic 300 can fill to the gaps 112 and the through holes. In this way, the through holes can serve as channels for material flow during injection molding, allowing the upper plastic 300 to fill the various gaps and gaps of the component more evenly, and also playing a role in venting or air circulation, avoiding gas accumulation during injection molding or assembly, and ensuring the quality of pressing. At the same time, the upper plastic 300 through the through holes can lock the pole post 100 during the filling process, restricting the relative movement of the pole post 100 and the top cover, and ensuring the stability after assembly. In addition, the through holes can reduce material usage and reduce the weight of the component while ensuring structural strength.

[0051] Reference Figure 2 and Figure 4 In some embodiments, a sealing ring 400 may be abutted between the pole post 100 and the top cover plate 200. The sealing ring 400 is pressed between the snap-fit ​​member 220 and the pole post 100, thereby enhancing the sealing performance between the top cover plate 200 and the pole post 100 and achieving a sealed connection between the pole post 100 and the pole post hole 210.

[0052] refer to Figure 2 In some embodiments, the top cover 200 is provided with an explosion-proof valve (not shown) for venting in emergency situations. The explosion-proof valve is provided with a protective membrane 231, and the protective membrane 231 may have an vent 232. An explosion-proof disc is provided inside the vent 232 to seal the vent; when the internal gas pressure of the battery reaches a preset explosion-proof threshold, the explosion-proof disc ruptures, and the gas is discharged from the vent 232. The protective membrane 231 can be used to protect the explosion-proof valve, and the vent 232 helps to maintain a balance of gas pressure on both sides of the explosion-proof valve. In use, when gas is generated inside the housing, causing the internal gas pressure to reach the explosion-proof threshold of the explosion-proof disc, the explosion-proof disc ruptures, and the gas is discharged from the vent 232, thereby preventing the housing from exploding.

[0053] In this embodiment, by setting an explosion-proof sheet, the possibility of battery explosion caused by gas generation inside the casing and the casing itself being sealed is reduced; when gas is generated inside the casing, the internal gas pressure increases until it reaches the preset explosion-proof threshold, at which point the explosion-proof sheet breaks, and the gas inside the casing is discharged from the exhaust port 232, thereby improving the safety performance of the battery.

[0054] Reference Figure 2 and Figure 4 In some embodiments, the top cover 200 further includes a lower plastic part 500, which is disposed on the side of the top cover 200 away from the upper plastic part 300 and is connected to the top cover 200.

[0055] In this embodiment, the lower plastic part 500 is disposed at the lower end of the top cover plate 200 and connected to the top cover plate 200. The lower plastic part 500 mainly serves to insulate the battery cell and fix the battery cell.

[0056] Secondly, one embodiment of this application provides a method for installing a battery top cover assembly 1, applicable to any of the battery top cover assemblies 1 provided in the first aspect above. The method for installing the battery top cover assembly 1 includes:

[0057] Insert the sealing ring 400 into the support protrusion 211 of the pole hole 210 on the top cover plate 200, then cover the pole 100 on the pole hole 210, and use the snap-fit ​​member 220 to snap and press the pressing part of the pole 100 to prevent the pole 100 from moving in the vertical direction; then, the upper plastic 300 can be injected into the snap-fit ​​member 220. The upper plastic 300 can fill the empty section 112, through hole and other gaps of the pole 100, thereby restricting the relative movement of the pole 100 and the top cover plate 200.

[0058] In this embodiment, a fixing member 110 is provided on the terminal post 100 of the battery top cover assembly 1, and a plastic 300 is provided between the top cover plate 200 and the fixing member 110 to restrict the position of the fixing member 110 and the snap-fit ​​member 220 on the top cover plate 200. A limiting force can be applied to the terminal post 100 to prevent it from twisting, thereby effectively preventing the terminal post 100 from rotating in the horizontal plane, making the fixing of the terminal post 100 more stable, enhancing its force-bearing capacity in all directions, improving anti-rotation performance, and enhancing torsional strength. It can also better prevent the phenomenon of the terminal post 100 rotating relative to the top cover plate 200, facilitating subsequent welding processes, thereby improving the manufacturing yield of the battery top cover assembly 1.

[0059] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery top cover assembly, characterized in that, include: A pole post, on which a fixing component is provided; A top cover sheet has a terminal hole, the terminal is covered on the terminal hole, one end of the terminal facing into the terminal hole is used to connect to the battery cell, and the other end of the terminal away from the terminal hole is used to connect to an external device. A snap-fit ​​component is provided on the top cover sheet. A plastic layer is placed between the top cover and the fixing member to restrict the position of the fixing member and the snap-fit ​​member.

2. The battery top cover assembly according to claim 1, characterized in that, The fastener includes a pressing section disposed on the outer edge of the pole post, a gap is formed between the pressing section and the outer edge of the pole post, the gap is filled with the upper plastic, and the upper plastic and the pressing section are pressed together.

3. A battery top cover assembly according to claim 2, characterized in that, The pressing section is provided in two places, and is spaced apart.

4. The battery top cover assembly according to claim 2, characterized in that, The snap-fit ​​component has a notch for the pressing section to extend into, and the upper plastic fills the space between the snap-fit ​​component and the pressing section so that the snap-fit ​​component and the pressing section snap into each other.

5. The battery top cover assembly according to claim 4, characterized in that, The size of the snap-fit ​​component is not smaller than that of the pressing section.

6. The battery top cover assembly according to claim 4, characterized in that, The snap-fit ​​component includes a support portion and an abutment portion, wherein one end of the support portion is connected to the top cover plate, the other end of the support portion is connected to the abutment portion, and the end of the abutment portion away from the support portion extends toward the center of the pole post, such that the pressing section overlaps with the projection of the abutment portion on the plane of the top cover plate.

7. The battery top cover assembly according to claim 6, characterized in that, The snap-fit ​​component has a plurality of through holes, which are spaced apart, and the upper plastic fills the through holes.

8. The battery top cover assembly according to claim 1, characterized in that, A sealing ring is provided between the electrode post and the top cover plate to seal the electrode post and the electrode post hole.

9. The battery top cover assembly according to claim 1, characterized in that, The top cover is equipped with an explosion-proof valve, the explosion-proof valve is provided with a protective film, and the protective film is provided with an exhaust hole.

10. The battery top cover assembly according to claim 1, characterized in that, The top cover also includes a lower plastic component, which is disposed on the side of the top cover away from the upper plastic component and is connected to the top cover.

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