A battery cover and a battery

Abstract

This invention discloses a battery cover and a battery. The battery cover includes a battery cover base plate and a lower insulating gasket. The lower insulating gasket is disposed at the bottom of the battery cover base plate. Multiple terminals are vertically disposed through the battery cover base plate and the lower insulating gasket. The terminals are fixedly connected to the battery cover base plate by an injection-molded component. The injection-molded component is located between the upper end of the terminal and the battery cover base plate. This invention features a scientifically designed structure. The terminals are fixedly connected to the battery cover base plate by an injection-molded component, and the injection-molded component is located between the upper end of the terminal and the battery cover base plate. Therefore, a reliable fixed connection can be achieved between the terminals and the battery cover base plate, effectively improving the terminals' ability to withstand downward vertical thrust. Furthermore, the injection-molded component only serves to fix and isolate the terminals from the battery cover base plate; even if the injection-molded component ages, the terminals will not detach vertically due to gravity.

Description

Technical Field

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

[0002] The battery cover is an important component of the power battery, and it has multiple functions such as sealing the battery casing, conducting current, relieving pressure, and providing fuse protection.

[0003] Currently, injection-molded battery covers do not require welding or riveting. They can be positioned and fixed using a one-piece injection molding method, which has the advantages of simple structure and low cost.

[0004] However, with the existing injection-molded battery cover, the injection-molded parts will age after long-term use, causing them to no longer firmly fix the terminals. As a result, the terminals are prone to falling off when subjected to large vertical downward thrust, and they are also prone to falling off under the influence of gravity. This seriously affects the normal use of the battery and reduces its lifespan.

[0005] like Figure 1 As shown, Figure 1 The existing injection-molded battery cover shown has a bottom electrode post 21 and an upper aluminum plate 10. An injection-molded part 30, used to fix the conductive output electrode post 20 and the aluminum plate 10, is placed on top of the aluminum plate 10, and the conductive output electrode post 20 and the aluminum plate 10 are only fixed together by the injection-molded part 30. The depth of the injection-molded part 30 into the protrusion 31 of the conductive output electrode post 20 is generally 0.5–1 mm. Therefore, during long-term use, potential problems include: as the injection-molded part 30 ages over time, the protrusion 31 that fixes the conductive output electrode post 20 also ages. If the conductive output electrode post 20 is not effectively fixed and limited, it will fall downwards due to gravity. Moreover, after the injection-molded part 30 ages, the conductive output electrode post 20 cannot withstand excessive downward thrust in the z-axis direction (i.e., vertical direction), thus causing the conductive output electrode post 20 to fall off.

[0006] Therefore, there is an urgent need to develop a technology that can solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a battery cover and a battery.

[0008] Therefore, the present invention provides a battery cover plate, including a battery cover plate base plate and a lower insulating pad;

[0009] The lower insulating pad is located at the bottom of the battery cover plate.

[0010] Multiple pole posts are vertically installed through the bottom plate of the battery cover and the lower insulating pad.

[0011] The terminal post and the bottom plate of the battery cover are fixedly connected by injection molding parts;

[0012] The injection molded part is located between the upper end of the terminal post and the bottom plate of the battery cover.

[0013] In addition, the present invention also provides a battery comprising the battery cover as described above.

[0014] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a battery cover and a battery with a scientific structural design. The terminal post and the bottom plate of the battery cover are fixedly connected by an injection molded part, and the injection molded part is located between the upper end of the terminal post and the bottom plate of the battery cover. Therefore, the terminal post and the bottom plate of the battery cover can be reliably fixedly connected, effectively improving the terminal post's ability to withstand vertical downward (from top to bottom) thrust, which has significant practical significance.

[0015] Furthermore, based on the technical solution of the present invention, since the injection molded part is located between the upper end of the terminal post and the bottom plate of the battery cover, the injection molded part only serves to fix and isolate the terminal post and the bottom plate of the battery cover (it does not provide support for the terminal post). Even if the injection molded part ages, the terminal post will not fall off vertically due to gravity.

[0016] After testing, it was found that by applying this invention, due to the adoption of a new injection molding structure, the problem of pole detachment caused by the aging of the injection molding parts used for fixing can be effectively avoided, and the ability of the pole to withstand the vertical downward (from top to bottom) thrust can be improved. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of an existing injection-molded battery cover.

[0018] Figure 2 This invention provides a three-dimensional exploded disassembly diagram of a battery cover.

[0019] Figure 3 A top view of the bottom plate of a battery cover provided by the present invention;

[0020] Figure 4 This is a cross-sectional view of one end of a battery cover provided by the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, 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," and "counterclockwise," 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 invention 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 invention.

[0023] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0024] 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 one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] See Figures 2 to 4 The present invention provides a battery cover plate, including a battery cover plate base plate 50 and a lower insulating pad 40;

[0026] The lower insulating pad 40 is disposed at the bottom of the battery cover base plate 50;

[0027] Multiple pole posts 80 (e.g., two) are vertically disposed on the battery cover bottom plate 50 and the lower insulating pad 40;

[0028] The terminal post 80 is fixedly connected to the battery cover base plate 50 by an injection molded part 70;

[0029] The injection molded part 70 is located between the upper end of the terminal post 80 and the bottom plate 50 of the battery cover.

[0030] In this invention, the upper transverse cross-sectional area of ​​the pole post 80 is greater than the lower transverse cross-sectional area.

[0031] In this invention, the upper end of the pole post 80 protrudes from the periphery of the injection molded part 70 or is aligned with the periphery of the injection molded part 70.

[0032] In this invention, the upper transverse cross-sectional area of ​​the pole post 80 is greater than or equal to the maximum value of the cross-sectional area of ​​the injection molded part 70.

[0033] It should be noted that, for this invention, the battery cover includes positive and negative electrode top cover assemblies. Since this solution does not involve distinguishing the polarity of the positive and negative terminals, the polarity of the terminals, terminal assemblies, etc., will not be described further. The positive and negative electrodes have the same structure; therefore, this solution will only describe one electrode as an example in detail.

[0034] In this invention, a plurality of terminal through holes 53 are provided through the bottom plate 50 of the battery cover.

[0035] Each pole post through hole 53 is provided with the lower end of a pole post 80;

[0036] Furthermore, a sealing ring 60 is provided on each pole post through hole 53;

[0037] The lower end of the pole post 80 is located in the sealing ring 60.

[0038] In this invention, there is a reserved injection gap between the upper end of the pole post 80 and the top of the battery cover bottom plate 50.

[0039] The injection gap is used to form the injection molded part 70 by injection molding.

[0040] Furthermore, the injection gap is distributed radially along the pole 80.

[0041] Furthermore, the lower insulating pad 40 is provided with a lower insulating pad through hole 402 at a position corresponding to each pole post through hole 53;

[0042] Preferably, the diameter of the through hole 402 of the insulating gasket is larger than the outer diameter of the core portion 830 at the lower end of the pole post 80.

[0043] Preferably, the outer diameter of the upper end of the sealing ring 60 is larger than the outer diameter of its lower end;

[0044] The lower end of the sealing ring 60 is embedded in the through hole 53 of the pole post.

[0045] Preferably, a sealing ring supporting step 5301 is provided around the top of the pole through hole 53;

[0046] The lower end of the sealing ring 60 is embedded in the sealing ring support step 5301.

[0047] In this invention, the pole post 80 includes a pole post cap portion 820 located at the upper end and a pole post core portion 830 located at the lower end.

[0048] The pole cap 820 is located on top of the pole core 830;

[0049] The injection molded part 70 is located between the terminal cap 820 at the upper end of the terminal post 80 and the top of the battery cover bottom plate 50.

[0050] Furthermore, there is a reserved injection gap between the terminal cap 820 and the top of the battery cover bottom plate 50;

[0051] Furthermore, at least one pole fixing connection hole 81 is provided on the pole cap 820;

[0052] The battery cover base plate 50 is provided with a battery cover fixing connection hole 54 at a position corresponding to each terminal post fixing connection hole 81;

[0053] On the upper and lower sides of the injection molded part 70, an upper connecting post 810 and a lower connecting post 540 are respectively provided at positions corresponding to the electrode post fixing connection hole 81 and the battery cover fixing connection hole 54.

[0054] The upper connecting post 810 and the lower connecting post 540 are respectively disposed in the pole post fixing connecting hole 81 and the battery cover fixing connecting hole 54.

[0055] Preferably, the multiple battery cover fixing connection holes 54 are evenly distributed along the circumference of the terminal post through hole 53.

[0056] Preferably, the lateral cross-sectional area of ​​the pole cap 820 is greater than the lateral cross-sectional area of ​​the pole core 830;

[0057] Preferably, the maximum lateral width of the pole cap 820 is greater than the maximum width of the sealing ring 60.

[0058] It should be noted that the number of battery cover fixing connection holes 54 can be adjusted according to actual needs, preferably 1 to 10 holes are evenly distributed around each terminal through hole 53.

[0059] Preferably, the battery cover fixing connection hole 54 is a through hole with an upper diameter smaller than the lower diameter, i.e., a through hole with a larger bottom and a smaller opening. The shape of the battery cover fixing connection hole 54 is an inverted frustum of a cone.

[0060] The cross-sectional shape of the battery cover fixing connection hole 54 can be circular, elliptical, square, rhomboid, or any other arbitrary shape.

[0061] Preferably, the pole fixing connection hole 81 is a through hole with an upper diameter larger than the lower diameter, i.e., a through hole with a smaller bottom and a larger opening. The shape of the pole fixing connection hole 81 is an inverted frustum of a cone.

[0062] The cross-sectional shape of the pole fixing connection hole 81 can be circular, elliptical, square, rhomboid or any other arbitrary shape.

[0063] Preferably, the upper connecting post 810 and the pole post fixing connecting hole 81 are interference fits;

[0064] The lower connecting post 540 and the battery cover plate fixing connection hole 54 are interference fit;

[0065] Preferably, the pole cap 820 is circular in shape;

[0066] Multiple pole fixing connection holes 81 are arranged around the pole cap 820;

[0067] Preferably, the pole core 830 is located in the sealing ring 60;

[0068] The pole core 830 and the sealing ring 60 are interference fit.

[0069] Furthermore, the upper connecting post 810 and the lower connecting post 540 on the injection molded part 70 are respectively set in the electrode fixing connection hole 81 and the battery cover fixing connection hole 54 by injection molding.

[0070] In this invention, a positive terminal post and a negative terminal post are provided on the bottom plate 50 of the battery cover.

[0071] In this invention, an explosion-proof hole 51 is provided on the bottom plate 50 of the battery cover.

[0072] An explosion-proof membrane 91 is installed on the explosion-proof hole 51;

[0073] Preferably, an explosion-proof film 91 is attached to the explosion-proof hole 51;

[0074] It should be noted that the explosion-proof film 91, which is pasted on the explosion-proof hole 51, is a PET plastic film.

[0075] Preferably, the explosion-proof hole 51 is located in the middle of the bottom plate 50 of the battery cover.

[0076] Furthermore, an explosion-proof valve 92 is provided (e.g., welded) at the bottom opening of the explosion-proof hole 51.

[0077] Furthermore, the lower insulating pad 40 is provided with a ventilation opening 401 at a position corresponding to the explosion-proof film 91 (i.e., directly below it).

[0078] It should be noted that the explosion-proof valve 92 serves an explosion-proof function, and is laser-welded to the bottom opening of the explosion-proof hole 51. By installing this explosion-proof valve 92, when the internal air pressure of the battery installed in the battery cover exceeds the pressure that the explosion-proof valve 92 can withstand, it can promptly release the gas inside the battery, ultimately reducing the pressure and maintaining the internal air pressure of the battery at a relatively stable state, thereby ensuring the safety of battery use.

[0079] In this invention, a sealable liquid injection hole 52 is provided on the bottom plate 50 of the battery cover.

[0080] Preferably, the injection hole 52 is sealed by a sealing pin.

[0081] Furthermore, the lower insulating pad 40 is provided with a liquid inlet 403 at a position corresponding to the liquid injection hole 52 (i.e., directly below it).

[0082] In this invention, the battery cover base plate 50 is preferably a smooth aluminum plate, that is, a flat aluminum plate.

[0083] In this invention, the lower insulating pad 40 is preferably a plastic sheet.

[0084] In this invention, such as Figure 2 As shown, the lower insulating pad 40 and the battery cover bottom plate 50 are fixedly connected by a positioning connecting post 405.

[0085] Furthermore, a plurality of positioning connecting posts 405 are provided on the top of the lower insulating pad 40;

[0086] The bottom plate of the battery cover bottom plate 50 is provided with positioning grooves at positions corresponding to each positioning connecting post 405;

[0087] The positioning connecting post 405 is embedded upward into the positioning groove.

[0088] Preferably, the positioning connecting post 405 and the positioning groove are interference fit.

[0089] It should be noted that the number of positioning connecting posts 405 and positioning grooves are the same, and their positions correspond one-to-one.

[0090] Furthermore, during assembly, the lower insulating pad 40 and the battery cover base plate 50 are fixedly connected together via positioning connecting posts 405 by means of hot melting or ultrasonic welding.

[0091] It should be noted that the number of positioning connecting posts 405 can be adjusted according to actual needs, and preferably 4 to 16 are evenly distributed on the lower insulating pad 40. The cross-sectional shape of the positioning connecting posts 405 can be adjusted according to actual needs, and is not limited to the circle shown in this invention. It can be a circle, ellipse, square, rhombus or any other arbitrary shape.

[0092] To better understand the technical solution of the present invention, the assembly process of the battery cover plate bottom plate and the terminal post is described below.

[0093] The first step is to insert the sealing ring 60 into the terminal hole 53 of the battery cover bottom plate 50 from the top to achieve a sealing effect between the terminal 80 and the battery cover bottom plate 50.

[0094] The second step is to insert the terminal cap 820, which is the large end of the terminal, into the terminal through hole 53 of the battery cover bottom plate 50 from the top, and place it inside the sealing ring 60 to ensure that the terminal fixing connection hole 81 corresponds one-to-one with the battery cover fixing connection hole 54 on the battery cover bottom plate 50.

[0095] The third step involves using an existing injection molding machine to perform injection molding on the gap between the terminal cap 820 at the upper end of the terminal post 80 and the top of the battery cover plate 50. This allows the thermoplastic plastic to fill the gap between the terminal cap 820 and the top of the battery cover plate 50, and simultaneously fill the terminal post fixing connection hole 81 and the battery cover fixing connection hole 54. After solidification, an upper connecting post 810 and a lower connecting post 540 are formed in the terminal post fixing connection hole 81 and the battery cover fixing connection hole 54, respectively, and the main body of the injection molded part 70 is formed between the terminal cap 820 and the top of the battery cover plate 50.

[0096] In other words, by using the existing injection molding process, an integral injection molded part 70 is formed. The upper connecting post 810 and the lower connecting post 540 on the injection molded part 70 can reliably lock the terminal post fixing connection hole 81 and the battery cover fixing connection hole 54, thereby realizing the fixed connection between the terminal post 80 and the battery cover bottom plate 50, and firmly fixing the terminal post 80 on the battery cover bottom plate 50.

[0097] It should be noted that, in this invention, after assembly, the large end portion of the terminal post (i.e., the terminal post cap 820) in the terminal post assembly is located on the upper side of the injection molded part 70 and the battery cover plate 50. The terminal post and the battery cover plate 50 each have a fixing connection hole. During assembly, these holes correspond one-to-one, and then injection molding is performed. The injection molded part fills the openings in the terminal post and the battery cover plate 50, forming a slot structure (specifically including the upper connecting post 810 and the lower connecting post 540, as well as the terminal post fixing connection hole 81 and the battery cover fixing connection hole 54), thereby securely connecting the terminal post and the battery cover plate 50 together.

[0098] In this invention, based on the battery cover provided by the present invention as described above, the present invention also provides a battery, including a hollow battery casing and a battery cover as described above.

[0099] The battery cover is sealed onto an opening on one side (e.g., the top opening) of the battery housing.

[0100] Compared with the prior art, the battery cover and battery provided by the present invention have the following beneficial effects:

[0101] 1. The structure is scientifically designed and the manufacturing process is convenient, which can effectively reduce production costs after mass production;

[0102] 2. The terminal cap 820, which is the large end of the terminal, is located on the upper side of the battery cover bottom plate 50. The injection molded part 70 only serves to fix and isolate the terminal 80 and the battery cover bottom plate 50. Even if the injection molded part 70 ages, the terminal 80 will not fall off vertically due to gravity.

[0103] 3. Since the terminal cap 820, which is the large end of the terminal, is located on the upper side of the battery cover bottom plate 50, the injection molded part 70 is filled between the terminal 80 and the battery cover bottom plate 50, which can effectively improve the ability of the terminal 80 to withstand the vertical downward (from top to bottom) thrust.

[0104] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery cover, characterized in that, Includes a battery cover base plate (50) and a lower insulating pad (40); The lower insulating pad (40) is disposed at the bottom of the battery cover base plate (50); Multiple pole posts (80) are vertically installed on the bottom plate (50) of the battery cover and the lower insulating pad (40); The terminal post (80) and the battery cover base plate (50) are fixedly connected by an injection molded part (70); The injection molded part (70) is located between the upper end of the pole post (80) and the bottom plate (50) of the battery cover. The cross-sectional area of ​​the upper end of the pole post (80) is greater than the cross-sectional area of ​​its lower end; The pole (80) includes a pole cap (820) at the upper end and a pole core (830) at the lower end; The pole cap (820) is located at the top of the pole core (830); The injection molded part (70) is located between the terminal cap (820) at the upper end of the terminal post (80) and the top of the battery cover bottom plate (50); At least one pole fixing connection hole (81) is provided on the pole cap (820); The battery cover base plate (50) is provided with a battery cover fixing connection hole (54) at the position corresponding to each terminal fixing connection hole (81); On the upper and lower sides of the injection molded part (70), an upper connecting post (810) and a lower connecting post (540) are respectively provided at positions corresponding to the pole post fixing connection hole (81) and the battery cover fixing connection hole (54). The upper connecting post (810) and the lower connecting post (540) are respectively disposed in the pole post fixing connecting hole (81) and the battery cover fixing connecting hole (54); The upper connecting post (810) and the lower connecting post (540) on the injection molded part (70) are respectively set in the pole post fixing connection hole (81) and the battery cover fixing connection hole (54) by injection molding. The battery cover fixing connection hole (54) is a through hole with an upper diameter smaller than the lower diameter; The pole fixing connection hole (81) is a through hole with an upper diameter larger than the lower diameter.

2. The battery cover as described in claim 1, characterized in that, The upper end of the pole (80) protrudes from the four edges of the injection molded part (70) or is aligned with the four edges of the injection molded part (70); And / or, the transverse cross-sectional area of ​​the upper end of the pole (80) is greater than or equal to the maximum value of the cross-sectional area of ​​the injection molded part (70).

3. The battery cover as described in claim 1, characterized in that, Multiple through holes (53) for the terminal posts are provided on the bottom plate (50) of the battery cover. Each pole through hole (53) is provided with the lower end of a pole (80); Each pole post through hole (53) is provided with a sealing ring (60); The lower end of the pole post (80) is located in the sealing ring (60); And / or, the lower insulating pad (40) is fixedly connected to the battery cover bottom plate (50) by a positioning connecting post (405); The top of the lower insulating pad (40) is provided with multiple positioning connecting posts (405); The bottom plate of the battery cover bottom plate (50) is provided with positioning grooves at positions corresponding to each positioning connecting post (405); The positioning connecting post (405) is inserted upward into the positioning groove; The positioning connecting post (405) and the positioning groove are interference fit.

4. The battery cover as described in claim 3, characterized in that, A sealing ring supporting step (5301) is provided around the top of the through hole (53); The lower end of the sealing ring (60) is embedded in the sealing ring support step (5301).

5. The battery cover as described in claim 1, characterized in that, Multiple battery cover fixing connection holes (54) are evenly distributed along the circumference of the electrode post through hole (53); And / or, the transverse cross-sectional area of ​​the pole cap (820) is greater than the transverse cross-sectional area of ​​the pole core (830).

6. The battery cover as described in claim 1, characterized in that, An explosion-proof hole (51) is provided on the bottom plate (50) of the battery cover; An explosion-proof membrane (91) is provided on the explosion-proof hole (51); An explosion-proof valve (92) is provided at the bottom of the explosion-proof hole (51); The lower insulating pad (40) is provided with a ventilation mesh (401) at a position corresponding to the explosion-proof membrane (91); And / or, a sealable liquid injection hole (52) is provided on the bottom plate (50) of the battery cover; The injection hole (52) is sealed by a sealing pin; The lower insulating pad (40) is provided with a liquid inlet (403) at a position corresponding to the liquid injection hole (52).

7. A battery, characterized in that, Includes the battery cover as described in any one of claims 1 to 6.

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