Battery top cover

Abstract

The utility model relates to a battery top cover. Comprising a pole, upper plastic, a fixing piece, a supporting piece and a top cover piece, the first end of the pole is fixed to one side of the top cover piece, the second end of the pole penetrates through the top cover piece and the supporting piece to be fixedly connected with the fixing piece, the upper plastic is arranged on the outer side of the supporting piece and the fixing piece, and the supporting piece is used for supporting the fixing piece. The projection of the supporting piece in the vertical direction at least partially coincides with the top cover piece. The battery top cover provided by the utility model can firmly fix the pole, and is high in safety and reliability.

Description

Technical Field

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

[0002] A battery typically consists of a cell, a casing, and a top cover. The top cover is usually installed on the top of the battery and has functions such as sealing, electrical connection, and protection of the internal cells. The positive and negative terminals of the battery are key components for connecting the internal and external circuits. The lower end of the terminal is connected to the positive and negative leads of the cell to form an internal electrical connection, and the upper end extends out to the top cover for connecting to the external circuit.

[0003] In existing top cover structures, after the terminal post passes through the top cover sheet, the fixing component is first secured to the top of the terminal post. Then, the top of the terminal post is injection molded to form an upper plastic layer. This upper plastic layer fills the accommodating space formed by the fixing component, the top cover, and the side wall of the terminal post, thus securing the terminal post and the top cover sheet. However, the vertical fixation between the terminal post, the fixing component, and the top cover relies entirely on the upper plastic layer. If problems occur during the injection molding process of the upper plastic layer, such as the accommodating space not being completely filled by the upper plastic layer, this not only affects the injection molding quality of the upper plastic layer but also poses potential risks to the fixation of the terminal post, the fixing component, and the top cover during subsequent use, thereby affecting the reliability of the battery. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cover with better fixing effect to address the above problems.

[0005] A battery top cover includes a terminal post, an upper plastic layer, a fixing member, a support member, and a top cover sheet. The top cover sheet has a terminal post hole. A first end of the terminal post is fixed to one side of the top cover sheet, and a second end passes through the terminal post hole and the support member and is fixedly connected to the fixing member. The upper plastic layer is disposed on the outside of the support member and the fixing member.

[0006] In one embodiment, the support member is disposed between the fixing member and the top cover plate, one end of the support member contacts the side surface of the pole post, and the other end extends away from the pole post, and the projection of the support member in the vertical direction at least partially coincides with the top cover plate.

[0007] In one embodiment, the fixing member is provided with a first welding surface, the second end of the pole is provided with a second welding surface, and the support member is used to support the fixing member so that the first welding surface and the second welding surface are flush.

[0008] In one embodiment, the lower surface of the upper plastic is provided with a second groove, and the upper surface of the top cover is provided with a second protrusion. The second groove is used to cooperate with the second protrusion to limit the relative rotation of the support and the top cover.

[0009] In one embodiment, the outer surface of the fastener is provided with a snap-fit ​​surface, which snaps into the upper plastic to restrict relative rotation between the upper plastic and the fastener.

[0010] In one embodiment, the electrode post includes a positive electrode post and a negative electrode post, and the support member includes a positive support member and a negative support member. The positive support member is also used to form a weak electrical connection between the positive electrode post and the top cover plate. The negative support member is an insulating member used to isolate the negative electrode post and the top cover plate. The support member can be integrally formed with the corresponding upper plastic.

[0011] In one embodiment, the fastener is used to fix the second end of the pole post to one side of the top cover plate; the projection of the fastener can fall on the top cover plate.

[0012] In one embodiment, a fixing part is provided at the first end of the pole post, the outer diameter of the fixing part being larger than the size of the pole post and the size of the pole post hole. An L-shaped sealing ring is provided between the pole post and the top cover plate. The L-shaped sealing ring includes a horizontal part and a vertical part that are connected to each other. The horizontal part is provided between the fixing part and the top cover plate, and the vertical part is provided between the side wall of the pole post and the pole post hole.

[0013] In one embodiment, the battery top cover further includes a lower plastic sheet disposed below the top cover sheet, the lower plastic sheet having a slot for engaging the second end of the terminal post; the upper surface of the lower plastic sheet has a first protrusion, and the lower surface of the top cover sheet has a first groove, the first protrusion engaging with the first groove to restrict relative movement between the top cover sheet and the lower plastic sheet.

[0014] In one embodiment, the top cover plate is provided with an injection hole, and the lower plastic plate is provided with a corresponding through hole. The lower plastic plate is also provided with a baffle plate, which is located at the through hole and has a gap between it and the through hole. The projection of the baffle plate on the top cover plate can completely cover the through hole.

[0015] The aforementioned battery top cover, by placing the support between the fixing component and the top cover plate, and fixing the second end of the terminal post to the fixing component after passing through the top cover plate, provides stable support for the terminal post within the battery top cover, reducing the risk of loosening caused by vibration and external forces, and improving the overall stability of the top cover. The upper plastic is located on the outside of the support and fixing components, protecting the structure that fixes the second end of the terminal post and ensuring the stability of the connection structure. By setting a sealing ring, it can effectively prevent external contaminants such as air and moisture from entering the battery, reducing the risk of leakage and thus extending battery life. The vertical projection of the support component at least partially overlaps with the top cover plate, which can share part of the stress of the terminal post and effectively reduce local stress concentration in the battery top cover. The above battery top cover can firmly fix the terminal post, with high safety and reliability. Attached Figure Description

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A top view of a battery top cover provided in an embodiment of the present invention;

[0018] Figure 2 A schematic cross-sectional view of the AA plane of the battery top cover provided in an embodiment of the present invention;

[0019] Figure 3 A partially enlarged view of the battery top cover provided in an embodiment of the present utility model;

[0020] Figure 4 A schematic cross-sectional view of the AA plane of the battery top cover provided in an embodiment of the present invention;

[0021] Figure 5 A partially enlarged view of the battery top cover provided in an embodiment of the present utility model;

[0022] Figure 6 An exploded view of the battery top cover provided in one embodiment of this utility model.

[0023] To make the above and other objects, features, advantages and embodiments of this utility model more apparent and understandable, the appended symbols are explained as follows:

[0024] 100. Battery top cover; 110. Terminal post; 111. Fixing part; 112. Welding blind hole; 120. Upper plastic; 130. Fixing part; 131. Snap-fit ​​surface; 140. Supporting part; 150. Top cover piece; 151. Terminal post hole; 152. Second protrusion; 153. Explosion-proof hole; 160. L-shaped sealing ring; 161. Horizontal part; 162. Vertical part; 170. Lower plastic; 171. First protrusion; 180. Explosion-proof valve; 181. Explosion-proof sheet; 182. Weak area; 183. Pressure-sensitive adhesive; 184. Explosion-proof valve protective film; 191. Injection hole; 192. Baffle plate; 193. Through hole. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model 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 utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly 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.

[0030] 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.

[0031] Figure 1 A top view of a battery top cover provided in an embodiment of the present invention; Figure 2 A schematic cross-sectional view of the AA plane of the battery top cover provided in an embodiment of the present invention; Figure 3 A partially enlarged view of the battery top cover provided in an embodiment of the present utility model; Figure 4 A schematic cross-sectional view of the AA plane of the battery top cover provided in an embodiment of the present invention; Figure 5 A partially enlarged view of the battery top cover provided in an embodiment of the present utility model; Figure 6 An exploded view of the battery top cover according to an embodiment of this utility model. (See attached diagram.) Figures 1 to 6An embodiment of the present invention provides a battery top cover 100, including a terminal post 110, an upper plastic 120, a fixing member 130, a support member 140, and a top cover sheet 150. The first end of the terminal post 110 is fixed to one side of the top cover sheet 150, and the second end passes through the top cover sheet 150 and the support member 140 and is fixedly connected to the fixing member 130. The upper plastic 120 is disposed on the outside of the support member 140 and the fixing member 130.

[0032] By fixing the bottom end (first end) of the pole post 110 to the bottom surface of the top cover plate 150, the top end (second end) of the pole post 110 passes through the top cover plate 150 and the support member 140 and is fixedly connected to the fixing member 130. Among them, the support member 140 provides stable support for the fixing member 130, thereby fixing the relative positions of the pole post 110, the fixing member 130 and the top cover plate 150 in the vertical direction.

[0033] The second end of the pole post 110 can be fixed to the fixing member 130 by welding, and the projection of the fixing member 130 in the top view can fall on the top cover plate 150. Since the fixing member 130 abuts against both the top cover plate 150 and the support member 140, the above arrangement can not only ensure the connection strength between the fixing member 130 and the pole post 110, but also avoid the misalignment of the abutment position of the fixing member 130 against the support member 140 and the abutment position of the top cover plate 150 against the support member 140, which would cause uneven force on the fixing member 130. Thus, the connection strength between the pole post 110, the fixing member 130, the support member 140 and the top cover plate 150 can be guaranteed.

[0034] The battery top cover 100, via the support member 140, securely connects the second end of the terminal post 110 to the fixing member 130, providing stable support for the terminal post 110 within the battery top cover 100. This reduces the risk of loosening caused by vibration and external forces, improving the overall stability of the top cover. The upper plastic 120 is located outside the support member 140 and the fixing member 130, protecting the connection structure of the second end of the terminal post 110 and ensuring connection strength. The vertical projection of the support member 140 at least partially overlaps with the top cover plate 150, sharing some of the stress on the terminal post 110 and effectively reducing local stress concentration in the battery top cover 100. Therefore, the battery top cover 100 can firmly fix the terminal post 110, resulting in high safety and reliability.

[0035] In an exemplary embodiment, a support member 140 is disposed between the fixing member 130 and the top cover plate 150. One end of the support member 140 contacts the side surface of the pole post 110, and the other end extends away from the pole post 110. The projection of the support member 140 in the vertical direction at least partially coincides with the top cover plate 150. With the above arrangement, the support member 140 can provide support between the fixing member 130 and the top cover plate 150. When the pole post 110 is subjected to force in the vertical direction, the force can be transmitted to the top cover plate 150 in sequence through the fixing member 130 and the support member 140 in the vertical direction, reducing the possibility of the pole post 110 torsion.

[0036] In an exemplary embodiment, the fastener 130 is provided with a first welding surface, the second end of the pole post 110 is provided with a second welding surface, and the support member is used to support the fastener 130 so that the first welding surface and the second welding surface are flush.

[0037] The battery top cover 100 also includes a lower plastic 170 disposed below the top cover sheet 150. The lower plastic 170 has a slot for engaging the second end of the terminal post 110. A first protrusion 171 is provided on the upper surface of the lower plastic 170, and a first groove is provided on the lower surface of the top cover sheet 150. The first protrusion 171 engages with the first groove to restrict relative movement between the top cover sheet 150 and the lower plastic 170. This arrangement ensures that the first welding surface and the second welding surface are flush, which helps improve the structural stability after welding.

[0038] In an exemplary embodiment, a second groove is provided on the lower surface of the upper plastic 120, and a second protrusion 152 is provided on the upper surface of the top cover 150. The second groove is used to cooperate with the second protrusion 152 to limit the relative rotation of the upper plastic 120 and the top cover 150, so that the components such as the fixing member 130, the support member 140 and the pole post 110 can be more firmly closed. The position and number of the second groove and the second protrusion 152 can be set according to actual needs, and this application does not limit them.

[0039] In an exemplary embodiment, the outer surface of the fastener 130 is provided with a snap-fit ​​surface 131, which snaps against the upper plastic 120 to limit relative rotation between the upper plastic 120 and the fastener 130. Figure 3As shown, the side of the fastener 130 is a cylindrical surface, and the snap-fit ​​surface 131 is a flat surface formed on the cylindrical surface. By snapping with the upper plastic 120 through this flat surface, the upper plastic 120 can be prevented from rotating around the side of the fastener 130. The relative position of the top cover 150 and the upper plastic 120 is fixed, and the relative position of the upper plastic 120 and the fastener 130 is fixed. Since the fastener 130 is fixed together with the top of the pole post 110, it can prevent the pole post 110 and the top cover 150 from rotating relative to each other, thereby achieving anti-torsion of the top of the pole post 110.

[0040] In an exemplary embodiment, the terminal 110 includes a positive terminal 110 and a negative terminal 110, and the support member 140 includes a positive support member 140 and a negative support member 140. The positive support member 140 is also used to form a weak electrical connection between the positive terminal 110 and the top cover plate 150. The negative support member 140 is made of insulating material and is used to isolate the negative terminal 110 and the top cover plate 150. The positive support member 140 is a resistive component that enables a weak electrical connection between the positive terminal 110 and the top cover plate 150, and the negative support member 140 is an insulating component that prevents an electrical connection between the negative terminal 110 and the top cover plate 150. The support member 140 can be a plastic component of the same material as the upper plastic 120, or it can be a connector of a different material than the upper plastic 120. The upper plastic 120 can be processed by injection molding, and after injection molding, the support member 140 can be integrally formed with the upper plastic 120.

[0041] In an exemplary embodiment, a fixing portion 111 is provided at the first end of the pole post 110. The outer diameter of the fixing portion 111 is larger than the size of the pole post 110 and the size of the pole post hole 151. An L-shaped sealing ring 160 is provided between the pole post 110 and the top cover plate 150. The L-shaped sealing ring 160 includes a horizontal portion 161 and a vertical portion 162 connected to each other. The horizontal portion 161 is disposed between the fixing portion 111 and the top cover plate 150, and the vertical portion 162 is disposed between the side wall of the pole post 110 and the pole post hole 151. The L-shaped sealing ring 160 is disposed between the pole post 110 and the top cover plate 150 and is press-fitted with the pole post 110 and the top cover plate 150 to provide a sealing function. Its horizontal portion 161 abuts against the bottom end of the pole post 110 and the bottom surface of the top cover plate 150 and is in a compressed state. The rebound force of the sealing ring exerts a downward thrust on the bottom of the electrode post 110, making the contact between the fixing member 130, the support member 140, and the top surface of the top cover plate 150 tighter. The vertical part 162 extends between the top cover plate 150 and the electrode post 110, and its top end abuts against the support member 140. The rebound force of the vertical part 162 can make the contact between the support member 140 and the fixing member 130 tighter; at the same time, it can also provide good sealing protection for the side wall of the electrode post 110, preventing external liquid from entering the top cover structure and contacting the electrode post 110, which could lead to corrosion of the electrode post 110. In some exemplary embodiments, the compression of the sealing ring is 35% to 60%.

[0042] In an exemplary embodiment, the top cover plate 150 has an explosion-proof hole 153, and an explosion-proof valve 180 is disposed on the explosion-proof hole 153. The explosion-proof valve 180 includes an explosion-proof sheet 181 covering the explosion-proof hole 153. The explosion-proof sheet 181 has a weak area 182, the thickness of which is less than the thickness of the non-weak area 182 on the explosion-proof sheet 181, and at least a portion of the non-weak area 182 is connected to the top cover plate 150. The top cover plate 150 also includes an explosion-proof valve 180 disposed within the explosion-proof hole 153. The explosion-proof valve 180 includes an explosion-proof sheet 181, and the explosion-proof sheet 181 has a weak area 182, the thickness of which is thinner than the thickness of other parts of the explosion-proof sheet 181. The explosion-proof disc 181 has a weak zone 182 absent for 1 / 5 to 1 / 4 of its circumference to prevent it from completely bursting open and spreading to other locations, thus improving battery safety. The explosion-proof valve 180 also includes an explosion-proof valve protective film 184, which covers the explosion-proof hole 153 and has vent holes for easy venting. The explosion-proof valve protective film 184 can be bonded to the edge of the explosion-proof hole 153 with pressure-sensitive adhesive 183, but some edges of the film are not fixed to the hole 153 by the adhesive to facilitate venting.

[0043] In an exemplary embodiment, the top end of the terminal post 110 is used for electrical connection with an external device, and the top surface of the terminal post 110 is provided with a welding blind hole 112 to facilitate welding with the external device. The bottom end of the terminal post 110 is used for connection with the battery cell inside the battery. The welding blind hole 112 can be a conical hole or a countersunk blind hole.

[0044] In an exemplary embodiment, the top cover plate 150 is also provided with an injection hole 191, the lower plastic plate 170 is provided with a corresponding through hole 193, and the lower plastic plate 170 is also provided with a baffle plate 192. The baffle plate 192 is located at the through hole 193 and a gap is left between it and the through hole 193 to allow the input of electrolyte. The projection of the baffle plate 192 on the top cover plate 150 can completely cover the through hole 193.

[0045] In one exemplary embodiment, a battery is also provided, including a housing, a battery cell, and a top cover as described in the above embodiments, the housing for receiving the battery cell, the housing having an opening, and the top cover for closing the opening.

[0046] 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.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery top cover, characterized in that, The battery top cover includes a terminal post, an upper plastic piece, a fixing member, a support member, and a top cover sheet. The top cover sheet has a terminal post hole. The first end of the terminal post is fixed to one side of the top cover sheet, and the second end passes through the terminal post hole and the support member and is fixedly connected to the fixing member. The upper plastic piece is disposed on the outside of the support member and the fixing member.

2. The battery top cover according to claim 1, characterized in that, The support member is disposed between the fixing member and the top cover plate. One end of the support member contacts the side surface of the pole post, and the other end extends away from the pole post. The projection of the support member in the vertical direction at least partially coincides with the top cover plate.

3. The battery top cover according to claim 1, characterized in that, The fixing member has a first welding surface, the second end of the pole has a second welding surface, and the support member is used to support the fixing member so that the first welding surface and the second welding surface are flush.

4. The battery top cover according to claim 1, characterized in that, The lower surface of the upper plastic sheet is provided with a second groove, and the upper surface of the top cover sheet is provided with a second protrusion. The second groove is used to cooperate with the second protrusion to limit the relative rotation of the support member and the top cover sheet.

5. The battery top cover according to claim 1, characterized in that, The outer surface of the fastener is provided with a snap-fit ​​surface, which snaps into the upper plastic to restrict the relative rotation between the upper plastic and the fastener.

6. The battery top cover according to claim 1, characterized in that, The electrode post includes a positive electrode post and a negative electrode post, and the support member includes a positive support member and a negative support member. The positive support member is also used to form a weak electrical connection between the positive electrode post and the top cover plate. The negative support member is an insulating member used to isolate the negative electrode post and the top cover plate. The support member can be integrated with the corresponding upper plastic.

7. The battery top cover according to claim 1, characterized in that, The fastener is used to fix the second end of the pole post to one side of the top cover plate; the projection of the fastener can fall on the top cover plate.

8. The battery top cover according to claim 1, characterized in that, The first end of the pole post is provided with a fixing part, the outer diameter of the fixing part is larger than the size of the pole post and the size of the pole post hole, and an L-shaped sealing ring is provided between the pole post and the top cover plate. The L-shaped sealing ring includes a horizontal part and a vertical part that are connected to each other. The horizontal part is provided between the fixing part and the top cover plate, and the vertical part is provided between the side wall of the pole post and the pole post hole.

9. The battery top cover according to claim 1, characterized in that, The battery top cover also includes a lower plastic piece disposed below the top cover sheet. The lower plastic piece has a slot for engaging the second end of the terminal post. The upper surface of the lower plastic piece has a first protrusion, and the lower surface of the top cover sheet has a first groove. The first protrusion engages with the first groove to limit the relative movement between the top cover sheet and the lower plastic piece.

10. The battery top cover according to claim 1, characterized in that, The top cover plate is also provided with an injection hole, and the lower plastic plate is provided with a corresponding through hole. The lower plastic plate is also provided with a baffle plate, which is located at the through hole and has a gap between it and the through hole. The projection of the baffle plate on the top cover plate can completely cover the through hole.

Images