Battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer. The battery top cover comprises a top cover piece, lower plastic and a baffle structure, a liquid injection hole is formed in the top cover piece, the lower plastic is attached to the side, close to the battery cell, of the top cover piece, and the baffle structure is embedded in the lower plastic and is opposite to the liquid injection hole. The radial size B of the baffle structure is larger than the radial size D of the liquid injection hole. One side surface of the baffle structure deviating from the top cover sheet does not exceed one side surface of the lower plastic cement deviating from the top cover sheet, and one side surface of the baffle structure close to the top cover sheet is provided with a groove group. A groove opening of the groove group is opposite to and communicated with the liquid injection hole, a circulation hole group is arranged at the bottom of the groove group, extends and penetrates through the lower plastic, and is positioned outside the projection of the liquid injection hole on the baffle structure along the H direction, and the radial size of the circulation hole group is smaller than the radial size D of the liquid injection hole. The battery top cover is high in space utilization rate, low in cost and capable of preventing the sealing rubber nail from abnormally separating from the liquid injection hole and falling into the shell, so that the safety of the battery is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery top cover and battery monomer. BACKGROUND

[0002] With the increasingly mature lithium ion battery technology, lithium ion battery as power battery is widely used in electric vehicles and energy storage fields. Generally, the battery includes the electric core, the shell and the top cover, the electric core is placed in the shell, the top cover is blocked in the shell opening, the top cover is equipped with the liquid injection hole, and the electrolyte is injected into the electric core through the liquid injection hole. In actual production, the battery is usually sealed by the sealing plastic nail after the liquid injection is completed, but the sealing plastic nail may have defects in the manufacturing process or be aged after working for a period of time, so that the sealing plastic nail is broken or abnormally separated from the liquid injection hole and falls into the electric core, causing internal short circuit of the electric core and affecting the safety performance of the power battery. In order to solve the above problems, in the prior art, one way is to set a mesh groove structure at the position opposite to the liquid injection hole at the bottom of the insulating plastic, and the mesh groove structure is provided with a mesh hole, so that the electrolyte is injected through the mesh groove structure and the sealing plastic nail is prevented from abnormally separating from the liquid injection hole and falling into the shell. Another way is to set a protruding part on the metal adapter plate at the bottom of the insulating plastic, and the protruding part is provided with a through hole for the electrolyte to pass through, so that the electrolyte is injected through the protruding part and the through hole of the metal adapter plate, and the sealing plastic nail is prevented from abnormally separating from the liquid injection hole and falling into the shell. However, whether it is the mesh groove structure of the first way or the protruding part of the second way, it is the structure of the protruding insulating plastic, which will occupy the space inside the battery, and even will squeeze the internal electric core.

[0003] Therefore, it is urgent to provide a battery top cover and a battery monomer to solve the above problems. UTILITY MODEL CONTENTS

[0004] The first purpose of the utility model is to provide a battery top cover, which has high space utilization rate and low cost, and can avoid the sealing plastic nail from abnormally separating from the liquid injection hole and falling into the shell, so as to improve the safety of the battery.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] The battery top cover comprises:

[0007] The top cover sheet is provided with a liquid injection hole;

[0008] The lower plastic is attached to the side of the top cover sheet close to the electric core;

[0009] A baffle structure is embedded in the lower plastic and opposite to the liquid injection hole. The radial dimension B of the baffle structure is greater than the radial dimension D of the liquid injection hole. The surface of the baffle structure away from the top cover plate does not exceed the surface of the lower plastic away from the top cover plate. A groove set is arranged on the surface of the baffle structure close to the top cover plate. The groove opening of the groove set is opposite to and communicates with the liquid injection hole. A flow hole set is arranged at the bottom of the groove set. The flow hole set extends through the lower plastic. The flow hole set is located outside the projection of the baffle structure along the H direction of the liquid injection hole. The radial dimension of the flow hole set is smaller than the radial dimension D of the liquid injection hole.

[0010] As an optional technical solution of the battery top cover, the groove set includes a main groove arranged opposite to the liquid injection hole. The flow hole set includes a plurality of first flow holes arranged along the bottom of the main groove in a circumferential direction.

[0011] As an optional technical solution of the battery top cover, the groove set further includes a plurality of auxiliary grooves arranged along the outer circumferential direction of the groove opening of the main groove. One end of each auxiliary groove communicates with the main groove. The other end of each auxiliary groove extends away from the main groove. The groove bottom surface of the auxiliary groove is not higher than the groove bottom surface of the main groove. The flow hole set further includes a second flow hole located at the bottom of the auxiliary groove.

[0012] As an optional technical solution of the battery top cover, the groove bottom of the main groove is provided with a plurality of protrusions arranged in a spaced manner to separate the main groove into a plurality of flow grooves. One end of each flow groove communicates with the other end of the flow groove at the center of the main groove. The other end of each flow groove communicates with the auxiliary groove or the first flow hole.

[0013] As an optional technical solution of the battery top cover, the groove bottom of the main groove is provided with a protrusion. The distance between the protrusion and the top cover plate gradually increases from the center of the main groove to the inner wall of the main groove. The first flow hole is located at the outer peripheral edge of the protrusion.

[0014] As an optional technical solution of the battery top cover, the number of auxiliary grooves is two. Both auxiliary grooves extend along the width direction of the battery top cover.

[0015] As an optional technical solution of the battery top cover, the number of first flow holes is two. Both first flow holes are arranged opposite to each other along the width direction of the battery top cover.

[0016] As an optional technical solution of the battery top cover, the maximum thickness dimension of the baffle structure is less than one half of the thickness dimension of the lower plastic.

[0017] As an optional technical solution of the battery top cover, the baffle structure is integrally formed with the lower plastic.

[0018] The second purpose of the utility model is to provide a battery monomer, which is high in safety.

[0019] To achieve the purpose, the utility model adopts the following technical scheme:

[0020] The battery monomer comprises a battery cell, a shell and the above-mentioned battery top cover, the battery cell is arranged in the shell, and the battery top cover is arranged at the opening of the shell.

[0021] The utility model has the advantages of:

[0022] The battery top cover provided by the utility model comprises a top cover sheet, a lower plastic and a baffle structure. The lower plastic is attached to one side of the top cover sheet close to the battery cell and plays a sealing and insulating role. The baffle structure is embedded in the lower plastic and opposite to the liquid injection hole. The radial dimension B of the baffle structure is greater than the radial dimension D of the liquid injection hole. The arrangement of the baffle structure can realize the sealing and insulating effect and does not separately occupy the space between the top cover sheet and the lower plastic. Compared with the sealing glue nails in the prior art that prolong the injection hole of the lower plastic, the battery top cover provided by the utility model can save the sealing glue nails in the lower plastic and save costs. The surface of the side, away from the top cover sheet, of the baffle structure does not exceed the surface of the side, away from the top cover sheet, of the lower plastic and does not occupy the internal space of the battery. A groove group is arranged on the side, close to the top cover sheet, of the baffle structure. The groove opening of the groove group is opposite to and communicates with the liquid injection hole. A flow-through hole group is arranged at the bottom of the groove group and extends through the lower plastic. The flow-through hole group is located outside the projection of the baffle structure along the H direction of the liquid injection hole, and the radial dimension of the flow-through hole group is smaller than the radial dimension D of the liquid injection hole. Electrolyte can be injected into the battery through the liquid injection hole, the groove group and the flow-through hole group in sequence. Compared with the prior art, the baffle structure can prevent the sealing glue nails from abnormally separating from the liquid injection hole and falling into the shell, thereby improving the safety performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a first sectional view of the battery top cover provided by the utility model embodiment one;

[0024] Figure 2 Fig. 2 is a second sectional view of the battery top cover provided by the utility model embodiment one; Figure 1 Fig. 3 is an enlarged view of A;

[0025] Figure 3 Fig. 4 is a third sectional view of the battery top cover provided by the utility model embodiment one;

[0026] Figure 4 Fig. 5 is a first assembly drawing of the lower plastic and the baffle structure of the battery top cover provided by the utility model embodiment one;

[0027] Figure 5 is the second assembly view of the lower plastic and baffle structure of the battery top cover provided by the embodiment one of the utility model;

[0028] Figure 6 is the first sectional view of the battery top cover provided by the embodiment two of the utility model;

[0029] Figure 7 is Figure 6 the enlarged view at B;

[0030] Figure 8 is the second sectional view of the battery top cover provided by the embodiment two of the utility model;

[0031] Figure 9 is the assembly view of the lower plastic and baffle structure of the battery top cover provided by the embodiment two of the utility model.

[0032] in the drawing,

[0033] 100, top cover sheet; 110, liquid injection hole; 200, lower plastic; 300, baffle structure; 310, groove group; 311, main groove; 312, auxiliary groove; 313, protruding part; 320, flow hole group; 321, first flow hole; 322, second flow hole; 400, pole; 500, upper plastic; 600, sealing ring. DETAILED DESCRIPTION

[0034] The utility model will be further explained in detail below by combining with the drawings and embodiments. It can be understood that the specific embodiments described here are only used for explaining the utility model, and not limited to the utility model. In addition, it needs to be explained that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.

[0035] In the description of the utility model, unless there is explicit definition and limitation, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication of two elements or the interaction of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature, which can include the first and second features directly contact, or can include the first and second features are not directly contact but contact through another feature between them. Moreover, the first feature is "on", "above" and "on the surface" of the second feature, which includes the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the second feature. The first feature is "under", "below" and "under" the second feature, which includes the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the second feature.

[0037] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and other orientation or position relations are based on the orientation or position relations shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0038] Embodiment one

[0039] The battery top cover provided by the embodiment has high space utilization and low cost, and can avoid that the sealing glue nail abnormally separates from the liquid injection hole 110 and falls into the shell, so that the safety of the battery is high.

[0040] Specifically as Figures 1 to 5 shown, the battery top cover includes a top cover sheet 100, a lower plastic 200 and a baffle structure 300. The top cover sheet 100 is provided with a liquid injection hole 110, the lower plastic 200 is attached to the side of the top cover sheet 100 close to the battery cell, and the baffle structure 300 is embedded in the lower plastic 200 and opposite to the liquid injection hole 110. The radial dimension B of the baffle structure 300 is greater than the radial dimension D of the liquid injection hole 110. The surface of the side of the baffle structure 300 away from the top cover sheet 100 does not exceed the surface of the side of the lower plastic 200 away from the top cover sheet 100, and the surface of the side of the baffle structure 300 close to the top cover sheet 100 is provided with a groove group 310. The groove opening of the groove group 310 is opposite and communicated with the liquid injection hole 110, the bottom of the groove group 310 is provided with a flow hole group 320, the flow hole group 320 extends through the lower plastic 200, the flow hole group 320 is located outside the projection of the baffle structure 300 along the H direction of the liquid injection hole 110, and the radial dimension of the flow hole group 320 is less than the radial dimension D of the liquid injection hole 110.

[0041] Based on the above design, the lower plastic 200 is attached to the top cover sheet 100 near the side of the battery cell, which plays a sealing and insulating role. The baffle structure 300 is embedded in the lower plastic 200 and opposite to the liquid injection hole 110. The radial dimension B of the baffle structure 300 is greater than the radial dimension D of the liquid injection hole 110. The setting of the baffle structure 300 can not only achieve the sealing and insulating effect, but also does not occupy the space between the top cover sheet 100 and the lower plastic 200. Compared with the prior art, the baffle structure 300 of the battery top cover can save the sealing glue nails in the lower plastic 200, thereby saving costs. The surface of the baffle structure 300 away from the top cover sheet 100 does not exceed the surface of the lower plastic 200 away from the top cover sheet 100, and does not occupy the internal space of the battery. The baffle structure 300 is provided with a groove group 310 on the side surface close to the top cover sheet 100. The groove opening of the groove group 310 is opposite and communicates with the liquid injection hole 110. The groove group 310 is provided with a flow hole group 320 at the bottom. The flow hole group 320 extends through the lower plastic 200. The flow hole group 320 is located outside the projection of the baffle structure 300 along the H direction of the liquid injection hole 110. The radial dimension of the flow hole group 320 is smaller than the radial dimension D of the liquid injection hole 110. The electrolyte can be injected into the battery through the liquid injection hole 110, the groove group 310 and the flow hole group 320 in turn. Compared with the prior art, the sealing glue nails can be prevented from abnormally separating from the liquid injection hole 110 and falling into the shell, thereby improving the safety performance of the battery.

[0042] It should be noted that the H direction is perpendicular to the surface of the top cover sheet 100. The projection of the liquid injection hole 110 along the H direction in the baffle structure 300 is the orthographic projection of the liquid injection hole 110 in the baffle structure 300. The outside of the orthographic projection refers to the area outside the two dashed lines in the figure.

[0043] Further, the groove group 310 includes a main groove 311, and the main groove 311 is arranged opposite to the liquid injection hole 110. The flow hole group 320 includes a plurality of first flow holes 321, and the plurality of first flow holes 321 are arranged in a circumferential direction at the bottom of the main groove 311. The electrolyte enters the main groove 311 through the liquid injection hole 110, and then is injected into the battery through the first flow holes 321 from the main groove 311, which can realize the injection of the electrolyte and can prevent the sealing glue nails from falling into the internal space of the battery through the first flow holes 321.

[0044] In this embodiment, the main groove 311 is circular, and the first flow holes 321 are arc-shaped strip holes. The main groove 311 and the first flow holes 321 are circularly coincident. Of course, in other embodiments, the main groove 311 and the first flow holes 321 can also have other shapes, which are not limited in the present application.

[0045] In order to increase the injection efficiency of the electrolyte, the groove group 310 further comprises a plurality of auxiliary grooves 312, the plurality of auxiliary grooves 312 are arranged at intervals along the outer periphery of the groove opening of the main groove 311, one end of each auxiliary groove 312 is communicated with the main groove 311, the other end of each auxiliary groove 312 extends away from the main groove 311, the groove bottom surface of the auxiliary groove 312 is not higher than the groove bottom surface of the main groove 311; the flow-through hole group 320 further comprises a second flow-through hole 322, the second flow-through hole 322 is located at the bottom of the auxiliary groove 312. The electrolyte entering the main groove 311 is injected through the first flow-through hole 321, and part of the electrolyte flows into the auxiliary groove 312 and is injected through the second flow-through hole 322.

[0046] Optionally, the number of the second flow-through hole 322 is a plurality, and the plurality of second flow-through holes 322 are distributed at intervals in the auxiliary groove 312.

[0047] In the embodiment, the second flow-through hole 322 is a circular hole. Of course, in other embodiments, the second flow-through hole 322 can also be a semicircular hole, a triangular hole or a square hole, etc., which is not limited in the utility model.

[0048] Further, the bottom of the main groove 311 is paved with a protruding part 313, the distance between the protruding part 313 and the top cover sheet 100 gradually increases from the center of the main groove 311 to the inner wall of the main groove 311, and the first flow-through hole 321 is located at the outer peripheral edge of the protruding part 313. That is, the groove bottom of the main groove 311 is convex to the direction close to the top cover sheet 100 as a whole, so as to avoid the accumulation of the electrolyte in the main groove 311 and facilitate the diffusion of the electrolyte to the surrounding and flow into the first flow-through hole 321 and the auxiliary groove 312.

[0049] In the embodiment, the number of the auxiliary groove 312 is two, and the two auxiliary grooves 312 extend along the width direction of the battery top cover, that is, the two auxiliary grooves 312 are symmetrical about the center line of the width of the battery top cover, the length of the auxiliary groove 312 is short, the electrolyte flow-through time is reduced, and the injection efficiency is improved.

[0050] Further, the number of the first flow-through hole 321 is two, and the two first flow-through holes 321 are oppositely arranged along the width direction of the battery top cover, so that the first flow-through hole 321 is located at the joint of the main groove 311 and the auxiliary groove 312, and the electrolyte in the main groove 311 can flow out.

[0051] In the embodiment, the maximum thickness dimension of the baffle structure 300 is less than one half of the thickness dimension of the lower plastic 200, so as to facilitate the installation of the baffle structure 300.

[0052] In the embodiment, the baffle structure 300 is integrally formed with the lower plastic 200, so as to save the cost.

[0053] Continue as Figure 1As shown, the battery top cover further comprises a pole 400, an upper plastic 500, and a sealing ring 600, etc., the pole 400 is sequentially provided with the upper plastic 500, the top cover sheet 100 and the lower plastic 200, and the sealing ring 600 is sleeved on the outer periphery of the pole 400 and abuts against the top cover sheet 100 and the lower plastic 200. The pole 400 comprises a positive pole 400 and a negative pole 400, and the positive pole 400 and the negative pole 400 are arranged at intervals along the length direction of the top cover sheet 100. The number of the upper plastic 500 and the sealing ring 600 is both two. The battery monomer provided by the embodiment has high safety.

[0054] Specifically, the battery monomer comprises a battery cell, a shell and the above-mentioned battery top cover, the battery cell is arranged in the shell, and the battery top cover is arranged at the opening of the shell. Since the battery top cover is provided with the above-mentioned baffle structure 300, the sealing glue nail can be prevented from abnormally separating from the liquid injection hole 110 and falling into the shell, thereby improving the safety of the battery monomer.

[0055] Embodiment two

[0056] The embodiment provides a battery top cover, which is different from the battery top cover provided in the embodiment one in that:

[0057] Specifically, Figures 6 to 9 As shown, the groove bottom of the main groove 311 is provided with a plurality of protruding portions 313, the plurality of protruding portions 313 are arranged at intervals to separate the main groove 311 into a plurality of flow grooves, one end of the plurality of flow grooves is cross-connected in the center of the main groove 311, and the other end of the flow groove is connected with the auxiliary groove 312 or the first flow-through hole 321. The flow channel is arranged to facilitate the smooth flow of the electrolyte into each first flow-through hole 321 and the auxiliary groove 312, thereby improving the liquid injection efficiency.

[0058] The rest of the structure of the battery top cover provided in the embodiment is the same as that in the embodiment one, and will not be repeated here.

[0059] Obviously, the above-mentioned embodiments of the utility model are only for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery top cover characterized by, The application relates to a battery top cover sheet. The application comprises: a top cover sheet (100) provided with a liquid injection hole (110); a lower plastic (200) attached to the side of the top cover sheet (100) close to the battery cell; 2. The battery header of claim 1, wherein, a baffle structure (300) embedded in the lower plastic (200) and opposite to the liquid injection hole (110), the radial dimension B of the baffle structure (300) being greater than the radial dimension D of the liquid injection hole (110), the surface of the side of the baffle structure (300) away from the top cover sheet (100) not exceeding the surface of the side of the lower plastic (200) away from the top cover sheet (100), the side of the baffle structure (300) close to the top cover sheet (100) being provided with a groove group (310), the groove opening of the groove group (310) being opposite to and communicating with the liquid injection hole (110), the bottom of the groove group (310) being provided with a flow-through hole group (320), the flow-through hole group (320) extending through the lower plastic (200), the flow-through hole group (320) being located outside the projection of the baffle structure (300) along the H direction of the liquid injection hole (110), and the radial dimension of the flow-through hole group (320) being smaller than the radial dimension D of the liquid injection hole (110).

3. The battery cup of claim 2, wherein: The groove group (310) comprises a main groove (311) provided opposite to the liquid injection hole (110); and the flow-through hole group (320) comprises a plurality of first flow-through holes (321) arranged along the bottom of the main groove (311) at intervals in the circumferential direction.

4. The battery header of claim 3, wherein, The groove group (310) further comprises a plurality of auxiliary grooves (312) arranged along the outer circumferential direction of the groove opening of the main groove (311) at intervals, one end of each auxiliary groove (312) communicating with the main groove (311), and the other end of each auxiliary groove (312) extending away from the main groove (311), the groove bottom surface of the auxiliary groove (312) being not higher than the groove bottom surface of the main groove (311); and the flow-through hole group (320) further comprises a second flow-through hole (322) located at the bottom of the auxiliary groove (312).

5. The battery cover of claim 3, wherein, The groove bottom of the main groove (311) is provided with a plurality of protruding portions (313) arranged at intervals to divide the main groove (311) into a plurality of flow grooves, one end of each flow groove being cross-connected in the center of the main groove (311), and the other end of each flow groove communicating with the auxiliary groove (312) or the first flow-through hole (321). The bottom of the main groove (311) is provided with a protruding portion (313), the distance between the protruding portion (313) and the top cover sheet (100) gradually increasing from the center of the main groove (311) to the inner wall of the main groove (311), and the first flow-through hole (321) being located at the outer circumferential edge of the protruding portion (313).

6. The battery header of claim 3, wherein, The number of the auxiliary grooves (312) is two, and the two auxiliary grooves (312) extend along the width direction of the battery top cover.

7. The battery header of claim 6, wherein, The number of the first flow-through holes (321) is two, and the two first flow-through holes (321) are oppositely arranged along the width direction of the battery top cover.

8. The battery cup of claim 1, wherein: The maximum thickness dimension of the baffle structure (300) is less than one half of the thickness dimension of the lower plastic (200).

9. The battery cup of claim 1, wherein: The baffle structure (300) is integrally formed with the lower plastic (200).

10. A battery cell, characterized by A battery including a cell, a housing, and the battery top cover of any one of claims 1-9, wherein the cell is disposed in the housing, and the battery top cover is disposed at an opening of the housing.

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