Battery cover plate assembly and battery

Abstract

The utility model provides a battery cover plate assembly and a battery. The battery cover plate assembly comprises: a cover plate body, wherein the cover plate body is provided with a first liquid injection through hole; the insulating part is arranged on one side of the cover plate body in the thickness direction, the insulating part is provided with a second liquid injection through hole communicated with the first liquid injection through hole, at least one flow dividing channel is arranged between the cover plate body and the insulating part, and the circumferential side wall of the first liquid injection through hole and / or the circumferential side wall of the second liquid injection through hole are / is communicated with the flow dividing channel. The liquid injection hole structure solves the problem of poor use effect of the liquid injection hole structure of the battery in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a battery cover plate subassembly and battery. BACKGROUND

[0002] At present, the liquid injection hole structure of the existing battery is usually that a liquid injection hole is designed on a cover plate body and a through hole communicated with the liquid injection hole is formed on an insulating piece for liquid injection, wherein the insulating piece is arranged on the side of the cover plate body facing the inside of the battery. This liquid injection hole structure has the following problems: 1. In order to ensure the sealing strength of the liquid injection hole after sealing, the diameter of the liquid injection hole should not be too large, the liquid injection flow channel is relatively single, and the impregnation efficiency of the electrolyte to the electrode assembly is low; 2. The lower part of the liquid injection hole is usually the end face of the tab or the electrode assembly, and the liquid injection needs to go through the processes of vacuumizing and liquid injection. During this process, the liquid injection pressure may be too large to damage the tab or impact the end face of the electrode assembly, resulting in the exposure of the tab; 3. The spacing between the bottom of the liquid injection hole and the end face of the tab or the electrode assembly directly affects the flowability of the electrolyte and the risk of electrolyte overflow from the liquid injection hole. In order to improve the energy density of the battery, the space inside the battery is constantly optimized, and this spacing is constantly compressed. As a result, the risk of electrolyte overflow from the liquid injection hole also increases.

[0003] Therefore, the existing technology has the problem of poor use effect of the liquid injection hole structure of the battery. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the utility model is to provide a battery cover plate assembly and a battery to solve the problem of poor use effect of the liquid injection hole structure of the battery in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery cover plate assembly is provided, which comprises: a cover plate body having a first liquid injection through hole; an insulating piece arranged on one side of the cover plate body in the thickness direction, the insulating piece having a second liquid injection through hole communicated with the first liquid injection through hole, and at least one shunt channel being formed between the cover plate body and the insulating piece, and the circumferential side wall of the first liquid injection through hole and / or the circumferential side wall of the second liquid injection through hole being communicated with the shunt channel.

[0006] Further, the circumferential side wall of the first liquid injection through hole has a communication opening, and the shunt channel is communicated with the first liquid injection through hole through the communication opening.

[0007] Further, a groove structure is formed on the cover plate body, the groove structure is used for forming the shunt channel, and the communication opening is communicated with the groove structure.

[0008] Further, the communication opening is two, the two communication openings are arranged on the circumferential side wall of the first liquid injection through hole in a spaced manner, and the two ends of the groove structure are respectively communicated with different communication openings.

[0009] Further, the cover plate body and the insulating piece are provided with groove structures on the side close to each other, and the groove structures of the cover plate body and the insulating piece are spliced to form the shunt channel.

[0010] Further, in the extension direction of the groove structure, the bottom surface height of the groove structure of the insulating piece gradually decreases in the direction away from the first liquid injection through hole.

[0011] Further, the side of the insulating piece facing the cover plate body is further provided with at least one liquid outlet channel, one end of the liquid outlet channel communicates with the shunt channel, and the other end of the liquid outlet channel extends to the circumference of the insulating piece.

[0012] Further, the center line of the cover plate body extending along the length direction passes through the center of the first liquid injection through hole, and the shunt channel is symmetrically arranged about the center line; and / or the liquid outlet channel is a plurality of liquid outlet channels, and the plurality of liquid outlet channels are divided into two groups, and the two groups of liquid outlet channels are symmetrically arranged about the center line.

[0013] Further, the cover plate body is further provided with an explosion-proof valve, and the shunt channel is arranged around the circumference of the explosion-proof valve.

[0014] According to another aspect of the utility model, a battery is provided, comprising the battery cover plate assembly.

[0015] According to the technical scheme of the utility model, the battery cover plate assembly in the application comprises a cover plate body and an insulating piece, the cover plate body is provided with a first liquid injection through hole; the insulating piece is arranged on one side of the cover plate body in the thickness direction, the insulating piece is provided with a second liquid injection through hole communicating with the first liquid injection through hole, at least one shunt channel is formed between the cover plate body and the insulating piece, and the circumferential side wall of the first liquid injection through hole and / or the circumferential side wall of the second liquid injection through hole communicates with the shunt channel.

[0016] When electrolyte is injected into the battery including the battery cover plate assembly in the application, since the cover plate body and the insulating piece have the first liquid injection through hole and the second liquid injection through hole which are in communication with each other, the electrolyte can enter through the first liquid injection through hole away from one end of the second liquid injection through hole, and can also enter into the inside of the battery through the second liquid injection through hole away from one end of the first liquid injection through hole and the shunt channel. Since the shunt channel is in communication with at least one of the first liquid injection through hole and the second liquid injection through hole, the shunting of the electrolyte can be realized through the shunt channel during the injection of the electrolyte, so that not only the overflow of the electrolyte from one end of the first liquid injection through hole away from the second liquid injection through hole can be prevented, but also the electrolyte can enter into the inside of the battery from different positions, so that the electrode assembly inside the battery can be soaked in multiple directions, thereby shortening the liquid injection soaking time and improving the soaking efficiency of the electrolyte on the electrode assembly. At the same time, since the electrolyte enters through the first liquid injection through hole and then flows out through the second liquid injection through hole and the shunt channel respectively, compared with the single up-down one-way injection of the electrolyte in the prior art, the impact force of the electrolyte on the tab or the end surface of the electrode assembly can be reduced, thereby reducing the damage to the tab or the electrode assembly, improving the process yield of the battery, and ensuring the consistency of the product quality. Therefore, the battery cover plate assembly in the application effectively solves the problem of poor use effect of the liquid injection hole structure of the battery in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the application form a part thereof, serve to provide further understanding of the application, and together with the specification explain the application. The use of the same reference numerals in different drawings indicates similar or identical components.

[0018] Figure 1 An exploded view of the battery cover plate assembly according to one specific embodiment of the application is shown;

[0019] Figure 2 An exploded view of the battery cover plate assembly according to one specific embodiment of the application is shown; Figure 1 A structural schematic view of the cover plate body of the battery cover plate assembly is shown;

[0020] Figure 3 A structural schematic view of the cover plate body of the battery cover plate assembly is shown; Figure 1 A structural schematic view of the insulating piece of the battery cover plate assembly is shown;

[0021] Figure 4 A sectional view of the connection between the first liquid injection through hole and the second liquid injection through hole in the application is shown;

[0022] Figure 5 Another angle of the sectional view of the connection between the first liquid injection through hole and the second liquid injection through hole in the application is shown.

[0023] Among the above drawings, the following reference numerals are used:

[0024] 10, cover plate body; 11, first liquid injection through hole; 111, communication opening; 12, explosion-proof valve; 13, assembly groove; 20, insulating piece; 21, second liquid injection through hole; 22, explosion-proof valve hollow part; 23, assembly convex bump; 30, shunt channel; 31, groove structure; 40, liquid outlet channel; 50, pole column assembly; 51, upper pole column; 52, lower pole column. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0027] In the present application, unless otherwise specified, the orientation words such as "upper, lower, top, bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves. Similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0028] In order to solve the problem of poor use effect of the liquid injection hole structure of the battery in the prior art, the present application provides a battery cover plate assembly and a battery.

[0029] Furthermore, the battery in the present application has the following battery cover plate assembly.

[0030] As shown in Figures 1 to 5 The battery cover plate assembly in the present application includes a cover plate body 10 and an insulating piece 20, the cover plate body 10 has a first liquid injection through hole 11; the insulating piece 20 is arranged on one side in the thickness direction of the cover plate body 10, the insulating piece 20 has a second liquid injection through hole 21 in communication with the first liquid injection through hole 11, there is at least one shunt channel 30 between the cover plate body 10 and the insulating piece 20, the circumferential side wall of the first liquid injection through hole 11 and / or the circumferential side wall of the second liquid injection through hole 21 is in communication with the shunt channel 30.

[0031] When injecting electrolyte into the battery including the battery cover plate assembly in the present application, since the cover plate body 10 and the insulating piece 20 have the first liquid injection through hole 11 and the second liquid injection through hole 21 that are in communication with each other, the electrolyte can enter through the first liquid injection through hole 11 away from one end of the second liquid injection through hole 21, and at the same time, can enter into the inside of the battery through the second liquid injection through hole 21 away from one end of the first liquid injection through hole 11 and the shunt passage 30. Since the shunt passage 30 is in communication with at least one of the first liquid injection through hole 11 and the second liquid injection through hole 21, the shunting of the electrolyte can be achieved through the shunt passage 30 during the process of injecting the electrolyte, so that not only can the overflow of the electrolyte from one end of the first liquid injection through hole 11 away from the second liquid injection through hole 21 be prevented, but also the electrolyte can enter into the inside of the battery from different positions, so that the electrode assembly inside the battery can be soaked in multiple directions, thereby shortening the liquid injection soaking time and improving the soaking efficiency of the electrolyte on the electrode assembly. At the same time, since the electrolyte enters through the first liquid injection through hole 11 and then flows out through the second liquid injection through hole 21 and the shunt passage 30 respectively, compared with the prior art of single upward and downward unidirectional injection of electrolyte, the impact force of the electrolyte on the tab or the end surface of the electrode assembly can be reduced, thereby reducing the damage to the tab or the electrode assembly, improving the process yield of the battery, and ensuring the consistency of product quality. Therefore, the battery cover plate assembly in the present application effectively solves the problem of poor use effect of the liquid injection hole structure of the battery in the prior art.

[0032] That is, in the present application, one end of the first liquid injection through hole 11 away from the second liquid injection through hole 21 is located on the side of the cover plate body 10 away from the insulating piece 20, i.e. on the top of the battery cover plate assembly; and one end of the second liquid injection through hole 21 away from the first liquid injection through hole 11 is located on the side of the insulating piece 20 away from the cover plate body 10, i.e. on the bottom of the battery cover plate assembly, and the one end of the second liquid injection through hole 21 away from the first liquid injection through hole 11 is in communication with the inside of the battery.

[0033] In the present application, the first liquid injection through hole 11 and the second liquid injection through hole 21 can be coaxially arranged, and the axis of the first liquid injection through hole 11 and the axis of the second liquid injection through hole 21 are parallel to the thickness direction of the cover plate body 10.

[0034] At the same time, in the present application, the shunt passage 30 can be in communication with only the circumferential outer side wall of the first liquid injection through hole 11, or only the circumferential outer side wall of the second liquid injection through hole 21, or both the circumferential outer side wall of the first liquid injection through hole 11 and the circumferential outer side wall of the second liquid injection through hole 21, or of course, different shunt passages 30 can be arranged to be in communication with the circumferential outer side wall of the first liquid injection through hole 11 and the circumferential outer side wall of the second liquid injection through hole 21 respectively. The specific arrangement form can be selected according to the actual use requirement.

[0035] In one specific embodiment of the present application, the circumferential side wall of the first liquid injection through hole 11 has a communication opening 111, and the shunt passage 30 communicates with the first liquid injection through hole 11 through the communication opening 111. That is, after the electrolyte is injected from the first liquid injection through hole 11 away from the end of the second liquid injection through hole 21 into the first liquid injection through hole 11, part of the electrolyte in the first liquid injection through hole 11 flows to the second liquid injection through hole 21 and flows out from the end of the second liquid injection through hole 21 away from the first liquid injection through hole 11, and the other part enters the shunt passage 30 through the communication opening 111 and flows out from the shunt passage 30.

[0036] In one specific embodiment of the present application, a groove structure 31 is formed on the cover plate body 10, the groove structure 31 is used to form the shunt passage 30, and the communication opening 111 communicates with the groove structure 31. Specifically, the communication opening 111 is two, and the two communication openings 111 are arranged on the circumferential side wall of the first liquid injection through hole 11, and the two ends of the groove structure 31 respectively communicate with different communication openings 111. That is, in the present application, the electrolyte can enter the shunt passage 30 through different communication openings 111, so as to realize entering the shunt passage 30 from different positions, thereby accelerating the efficiency of the electrolyte entering the shunt passage 30, and improving the injection efficiency of the electrolyte, and at the same time, through such arrangement, it can also ensure that the electrolyte can more easily infiltrate the electrode assembly in different directions.

[0037] Optionally, the groove structure 31 on the cover plate body 10 can be used as the shunt passage 30, that is, the shunt passage 30 is arranged as part of the internal structure of the cover plate body 10.

[0038] Optionally, the cover plate body 10 and the insulating piece 20 respectively have groove structures 31 on the side close to each other, and the groove structures 31 of the cover plate body 10 and the insulating piece 20 are spliced to form the shunt passage 30. That is, in the present embodiment, the shunt passage 30 is composed of the part close to each other of the cover plate body 10 and the insulating piece 20, and through such arrangement, it can ensure that the electrolyte in the shunt passage 30 can more easily flow into the inside of the battery. Of course, in the present application, when the shunt passage 30 communicates with the second liquid injection through hole 21, the shunt passage 30 can also be arranged as part of the internal structure of the insulating piece 20.

[0039] In the present application, after the electrolyte enters the shunt channel 30 through the communication opening 111, in order to accelerate the flow speed of the electrolyte in the shunt channel 30 and avoid the accumulation of the electrolyte at the connection between the shunt channel 30 and the communication opening 111, the shunt channel 30 can be provided with a certain slope structure. Alternatively, in the extension direction of the groove structure 31, the bottom surface height of the groove structure 31 of the insulating piece 20 gradually decreases in the direction away from the first liquid injection through hole 11, so as to ensure that the electrolyte can flow away from the first liquid injection through hole 11 under the action of gravity.

[0040] Alternatively, the side of the insulating piece 20 towards the cover plate body 10 also has at least one liquid outlet channel 40, one end of the liquid outlet channel 40 communicates with the shunt channel 30, and the other end of the liquid outlet channel 40 extends to the circumference of the insulating piece 20. By such a setting, it can be ensured that the electrolyte in the shunt channel 30 can flow into the inside of the battery through the liquid outlet channel 40 to soak the electrode assembly in the battery. Moreover, when the liquid outlet channel 40 is multiple, the electrolyte can enter different liquid outlet channels 40 from the shunt channel 30, so as to soak the electrode assembly from different directions. When the shunt channel 30 is formed on the cover plate body, the electrolyte can flow into the inside of the battery through the liquid outlet channel 40 on the insulating piece, or the electrolyte can flow into the inside of the battery by setting a corresponding liquid outlet channel on the cover plate body.

[0041] Alternatively, the middle line of the cover plate body 10 extending along the length direction passes through the center of the first liquid injection through hole 11, and the shunt channel 30 is symmetrically arranged about the middle line. Moreover, at this time, the two communication openings 111 on the first liquid injection through hole 11 are symmetrically arranged about the middle line, so as to ensure that the electrolyte can more uniformly enter the shunt channel 30 through the two communication openings 111 respectively.

[0042] Alternatively, the liquid outlet channel 40 is multiple, and the multiple liquid outlet channels 40 are divided into two groups, and the two groups of liquid outlet channels 40 are symmetrically arranged about the middle line. By such a setting, not only can the electrolyte soak the electrode assembly through different directions, but also the electrode assembly can be more uniformly soaked by the electrolyte.

[0043] Specifically, the cover plate body 10 also has a pressure relief valve 12, and the shunt channel 30 is arranged around the circumference of the pressure relief valve 12. In the present application, the part of the insulating piece 20 corresponding to the pressure relief valve 12 can also be provided with a pressure relief valve hollow part 22. At the same time, the shunt channel 30 can also pass through the pressure relief valve hollow part 22. Of course, in the present application, the specific structure of the shunt channel 30 can be set according to the actual use requirement. Moreover, the shunt channel 30 can be a polygonal structure, or a circular arc structure or other structure.

[0044] Specifically, the battery cover plate assembly further comprises two pole post assemblies 50, the pole post assemblies 50 are arranged through the cover plate body 10 and the insulating piece 20, and the explosion-proof valve 12 and the shunt passage 30 are located between the two pole post assemblies 50 in the length direction of the cover plate body 10. And in the application, the pole post assembly 50 can comprise an upper pole post 51 and a lower pole post 52, and the upper pole post 51 and the lower pole post 52 are welded and fixed. At the same time, the insulating piece 20 can also be designed with a corresponding hot melting point and a hot melting fixing of the counterbore hole on the cover plate body 10. At the same time, the side of the cover plate body 10 towards the insulating piece 20 is provided with an assembly groove 13 corresponding to the lower pole post 52, and the insulating piece 20 body has an assembly convex 23 matched with the assembly groove 13, so as to ensure the stability of the connection between the upper pole post 51 and the lower pole post 52.

[0045] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0046] 1. Effectively solve the problem of poor use effect of the liquid injection hole structure of the battery in the prior art;

[0047] 2. Simple structure and stable performance.

[0048] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0049] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0050] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein.

[0051] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cover assembly, characterized in that, include: The cover plate body (10) has a first liquid injection through hole (11); An insulating element (20) is disposed on one side of the cover plate body (10) in the thickness direction. The insulating element (20) has a second injection through hole (21) communicating with the first injection through hole (11). At least one diversion channel (30) is provided between the cover plate body (10) and the insulating element (20). The circumferential sidewall of the first injection through hole (11) and / or the circumferential sidewall of the second injection through hole (21) are in communication with the diversion channel (30).

2. The battery cover assembly according to claim 1, characterized in that, The circumferential sidewall of the first injection through hole (11) has a connecting opening (111), and the diversion channel (30) is connected to the first injection through hole (11) through the connecting opening (111).

3. The battery cover assembly according to claim 2, characterized in that, The cover plate body (10) is provided with a groove structure (31), the groove structure (31) is used to form the diversion channel (30), and the connecting opening (111) is connected to the groove structure (31).

4. The battery cover assembly according to claim 3, characterized in that, There are two connecting openings (111), which are spaced apart on the circumferential sidewall of the first injection hole (11), and the two ends of the groove structure (31) are respectively connected to different connecting openings (111).

5. The battery cover assembly according to claim 1, characterized in that, The cover plate body (10) and the insulating member (20) have groove structures (31) on their respective sides that are close to each other, and the groove structures (31) of the cover plate body (10) and the groove structures (31) of the insulating member (20) are spliced ​​together to form the diversion channel (30).

6. The battery cover assembly according to claim 5, characterized in that, In the extending direction of the groove structure (31), the bottom height of the groove structure (31) of the insulating member (20) gradually decreases in the direction away from the first liquid injection through hole (11).

7. The battery cover assembly according to claim 1, characterized in that, The insulating element (20) also has at least one liquid outlet channel (40) on the side facing the cover plate body (10), one end of the liquid outlet channel (40) is connected to the diversion channel (30), and the other end of the liquid outlet channel (40) extends to the periphery of the insulating element (20).

8. The battery cover assembly according to claim 7, characterized in that, The centerline of the cover plate body (10) extending along its length passes through the center of the first injection hole (11). The diversion channel (30) is symmetrically arranged about the centerline; and / or There are multiple liquid outlet channels (40), and the multiple liquid outlet channels (40) are divided into two groups, and the two groups of liquid outlet channels (40) are symmetrically arranged about the center line.

9. The battery cover assembly according to any one of claims 1 to 8, characterized in that, The cover plate body (10) also has an explosion-proof valve (12), and the diversion channel (30) is arranged circumferentially around the explosion-proof valve (12).

10. A battery, characterized in that, Includes the battery cover assembly according to any one of claims 1 to 9.

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