Battery top cover and battery
By designing a battery cover with through holes and liquid injection pipes, the problem of battery cell damage and low diffusion efficiency during lithium-ion battery injection is solved, and the electrolyte is efficient and uniformly injected, ensuring the safety and stability of the battery.
Patent Information
- Application Number
- CN202421674631.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-16
AI Technical Summary
During the injection process of lithium-ion batteries, lithium-ion batteries can easily lead to cell damage and low diffusion efficiency of electrolyte, resulting in uneven infiltration of the electrode sheet, affecting the safety and stability of the battery.
A battery ceiling is designed, including a cover body, a liquid injection port, a liquid injection part, a through hole and a liquid injection pipe. The liquid injection part is hollow inside, and multiple through holes and liquid injection pipes are provided. The electrolyte enters the liquid injection part through the liquid injection port to reduce the impact on the battery cell, and the multiple battery cell areas are simultaneously injected through the multiple liquid injection pipes.
It improves the efficiency and uniformity of electrolyte injection, reduces the risk of battery cell damage, and ensures the safety and stability of the battery.
Smart Images
Figure CN222927756U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and particularly relates to a battery top cover and a battery. Background Art
[0002] In the field of new energy industry, as a key core component, lithium-ion batteries are widely used in the fields of power, energy storage, 3C, etc. Therefore, the safety and stability of lithium-ion batteries have received more and more attention. During the battery production process, it is necessary to fill the electrolyte into the battery cells. When injecting the liquid, it is often vertically injected into a fixed position of the battery cell through the injection port. The electrolyte is likely to impact the battery cell and cause damage. At the same time, the diffusion efficiency of the directly injected electrolyte is relatively low, and problems such as inconsistent wetting effect of the electrodes inside the battery cell are likely to occur. Especially when the volume of the battery cell is large, problems such as low injection efficiency and uneven injection are becoming increasingly prominent. Summary of the Invention
[0003] In view of this, the present application provides a battery top cover and a battery, aiming to solve the problems of low and uneven injection efficiency of battery electrolyte. In a first aspect, a battery top cover is provided for injecting electrolyte into the battery cells of a battery. The battery includes a plurality of battery cell areas. The battery top cover includes: a cover body, on which an injection port is opened; an injection part, connected to the injection port, and the inside of the injection part is hollow, including: a plurality of through holes and a plurality of injection pipes; a plurality of through holes, provided at the bottom of the injection part; a plurality of injection pipes, connected to the injection port and correspondingly connected to the plurality of battery cell areas, and configured to synchronously inject electrolyte into the plurality of battery cell areas.
[0004] Through the above battery top cover, by providing a plurality of through holes and a plurality of injection pipes in the injection part, when the electrolyte enters from the injection port, the impact of the electrolyte on the battery cell is reduced, and the electrolyte is synchronously injected into the plurality of battery cell areas through the plurality of injection pipes, promoting consistent wetting of the electrodes inside the battery cell. There is no need to inject electrolyte into one battery cell area and then inject into the next battery cell area, and the injection efficiency of the electrolyte is high.
[0005] Optionally, the first ends of the plurality of injection pipes are provided at the top of the injection part, the plurality of injection pipes extend outward around the bottom of the injection part, and the second ends of the plurality of injection pipes are correspondingly connected to the plurality of battery cell areas.
[0006] Optionally, the injection pipe includes: a first part and a second part; the first part includes the first end of the injection pipe; the second part is parallel to the bottom of the injection part, and the connection part of the first part and the second part is provided near the bottom edge of the injection part.
[0007] Optionally, the included angle formed by the first part and the downward extension direction of the injection port includes 0 degree to 90 degrees; the inner diameter of the injection pipe includes 0.2 mm to 0.5 mm.
[0008] Optionally, it further includes: a connecting pipe, which is arranged between the liquid injection port and the top of the liquid injection part.
[0009] Optionally, the length of the connecting pipe ranges from 3 millimeters to 15 millimeters.
[0010] Optionally, the shape of the liquid injection part is a frustum of a cone.
[0011] Optionally, it further includes: a gasket, which is arranged at the bottom of the cover body and has a circular hole opposite to the position of the liquid injection port; a terminal post, which is arranged on the cover body.
[0012] Optionally, the diameter of the plurality of through holes ranges from 0.5 millimeters to 3 millimeters.
[0013] In a second aspect, a battery is provided, which includes the battery top cover of the above first aspect. Description of the Drawings
[0014] The following briefly introduces the drawings used in the description of the embodiments of the present application:
[0015] Figure 1 Shows a schematic structural diagram of a battery top cover provided in some embodiments of the present application;
[0016] Figure 2 Shows a schematic structural diagram of the liquid injection part provided in some embodiments of the present application;
[0017] Figure 3 Shows a schematic cross-sectional view of the connection part between the liquid injection pipe and the liquid injection port provided in some embodiments of the present application;
[0018] Figure 4 Shows a top view of the liquid injection part provided in some embodiments of the present application;
[0019] Figure 5 Shows a schematic structural diagram of the liquid injection pipe provided in some embodiments of the present application.
[0020] Explanation of the reference numerals in the drawings: 100 - battery top cover, 110 - cover body, 120 - liquid injection port, 130 - liquid injection part, 131 - through hole, 132 - liquid injection pipe, 1321 - first part, 1322 - second part, 140 - connecting pipe, 150 - gasket, 160 - terminal post, 170 - explosion-proof valve. Detailed Embodiments
[0021] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will describe the specific implementation manners of the present application with reference to the accompanying drawings. The accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings or embodiments can be obtained based on these drawings or embodiments. Adjustments and improvements made without departing from the concept of the present application fall within the protection scope of the present application.
[0022] To make the drawings concise, each drawing only schematically shows the parts related to the embodiments, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, for components with the same structure or function, only part of them are schematically shown, and there may actually be more or fewer components with the same structure or function.
[0023] In the present application, unless otherwise clearly specified and limited, ordinal numbers, such as "first", "second", etc., are only used to distinguish and describe related objects, and cannot be understood as indicating or implying the relative importance or order between related objects; in addition, they do not represent the quantity of related objects. "A plurality of" includes two or more, and other quantifiers are similar. " / " is used to describe the relationship between related objects, which means the "or" relationship between related objects. "And / or" is used to describe the relationship between related objects, which includes any combination relationship between related objects. For example, "a and / or b" includes: "a alone", "b alone", or "a and b". "One or more" or "at least one" among a plurality of objects refers to any object or any combination of a plurality of objects. For example, "one or more of a1, a2, a3" or "at least one of a1, a2, a3" includes: "a1 alone", "a2 alone", "a3 alone", "a1 and a2", "a1 and a3", "a2 and a3", or "a1, a2 and a3".
[0024] In the field of the new energy industry, as a key core component, lithium-ion batteries are widely used in the fields of power, energy storage, 3C, etc. Therefore, the safety and stability of lithium-ion batteries have received more and more attention. During the battery production process, it is necessary to fill the electrolyte into the battery cells. Currently, the structure of lithium-ion batteries mainly includes battery cells, a housing, and a top cover assembly. Among them, a liquid injection port is opened on the top cover. During liquid injection, the electrolyte is often vertically injected into a fixed position of the battery cell through the liquid injection port. During the liquid injection process, the electrolyte is likely to impact the battery cell and cause its damage. At the same time, the diffusion efficiency of the directly injected electrolyte is relatively low, and problems such as inconsistent wetting effect of the electrodes inside the battery cell are likely to occur. Especially in the fields of new energy vehicles or energy storage technologies, when the volume of the battery and the battery cell is relatively large, low liquid injection efficiency and uneven liquid injection are likely to lead to uneven wetting of the electrodes of the battery, resulting in an imbalance in the oxidation-reduction reaction of the battery and causing safety risks during the battery production process.
[0025] Please refer to Figure 1 which shows a schematic structural diagram of a battery top cover provided in some embodiments of the present application. The battery top cover 100 is used for injecting electrolyte into the battery cells. The battery includes a plurality of cell regions. The battery top cover 100 includes: a cover body 110, on which an injection port 120 is opened; an injection part 130, connected to the injection port 120 and having a hollow interior. Please refer to Figure 2 which shows a schematic structural diagram of the injection part provided in some embodiments of the present application. The injection part 130 includes: a plurality of through holes 131 and a plurality of injection pipes 132; the plurality of through holes 131 are arranged at the bottom of the injection part 130; the plurality of injection pipes 132 are connected to the injection port 120 and correspondingly connected to the plurality of cell regions, and are configured to synchronously inject electrolyte into the plurality of cell regions.
[0026] In the traditional top cover structure and injection method of directly injecting electrolyte, when the battery includes a plurality of cell regions, there may be isolation or a relatively large distance between regions. When directly injecting, it may be necessary to fill a cell region with electrolyte and then use the electrolyte overflowing from this region to continue filling other electrolytes, resulting in uneven electrolyte injection in the plurality of cell regions. At the same time, the electrolyte often has corrosiveness, and the direct injection method is likely to impact the space for accommodating electrolyte in the fragile cell region when injecting too fast, causing it to deform or be damaged. In the solution of the present application, the electrolyte enters the injection part 130 through the injection port 120. At this time, the electrolyte is divided into two main parts. The first part of the electrolyte is directly injected into the cell region below the injection part 130 through the plurality of through holes 131. The plurality of through holes 131 can effectively relieve the impact force of the electrolyte during the electrolyte injection process, so that it flows out from the through holes 131, preventing the situation of impacting the inner wall of the cell. The second part of the electrolyte enters the plurality of injection pipes 132. The injection pipes 132 can directly communicate with the plurality of cell regions of the battery, so that the plurality of cell regions are simultaneously injected with electrolyte, without waiting for a certain cell region to be filled and then overflowing into other cell regions, realizing the uniformity of electrolyte injection. The diameters of the plurality of through holes 131 can be set based on the demand and efficiency of electrolyte injection, so as to control the speed of the electrolyte flowing into the cell region. For example, the diameter of the through holes 131 can be set to include 0.5 mm to 3 mm.
[0027] In some embodiments of the present application, refer to Figure 3, which shows a top view of the liquid injection part provided by some embodiments of the present application. The first ends of a plurality of liquid injection pipes 132 are arranged at the top of the liquid injection part 130, and the plurality of liquid injection pipes 132 extend outward around the bottom of the liquid injection part 130, and the second ends of the plurality of liquid injection pipes 132 are correspondingly connected to a plurality of battery cell areas. The shape of the liquid injection port 120 can be circular, and the plurality of liquid injection pipes 132 are evenly arranged along the edge of the circular liquid injection port 120. The electrolyte that fails to enter the liquid injection pipes 132 through the liquid injection port 120 can enter the interior of the liquid injection part 130 and flow out to the battery cell area through a plurality of through holes 131. Refer to Figure 4 , the plurality of liquid injection pipes 132 can be evenly arranged along the edge of the bottom of the liquid injection part 130 and extend outward until reaching the battery cell area corresponding to the liquid injection pipes 132.
[0028] Please refer to Figure 4 , which shows a schematic structural diagram of the liquid injection pipe provided by some embodiments of the present application. The liquid injection pipe 132 includes: a first part 1321 and a second part 1322; the first part 1321 includes the first end of the liquid injection pipe; the second part 1322 is parallel to the bottom of the liquid injection part 130, and the connection part of the first part 1321 and the second part 1322 is arranged close to the bottom edge of the liquid injection part 130. The setting of the first part 1321 can enable the electrolyte to flow into the liquid injection pipe 132 more smoothly. At the same time, the second part 1322 being parallel to the bottom of the liquid injection part 130 makes the electrolyte flow out more evenly as a whole and be sent to the corresponding battery cell area. Exemplarily, the inner diameter of the liquid injection pipe 132 can be adjusted according to the battery size and the demand for the electrolyte injection volume to better control the efficiency of the electrolyte injection. For example, the inner diameter of the liquid injection pipe can be set to include 0.2 mm to 0.5 mm; the first part 1321 forms an angle with the downward extension direction of the liquid injection port 120 to drain the electrolyte. For example, the angle can be set to include 0 degrees to 90 degrees.
[0029] In some embodiments of the present application, refer to Figure 5 , further including: a connection pipe 140, arranged between the liquid injection port 120 and the top of the liquid injection part 130 to drain the electrolyte from the liquid injection port 120 and make the electrolyte easier to flow into the liquid injection pipe 132, improving the efficiency of the electrolyte injection. The length of the connection pipe 140 can be set according to the demand for the electrolyte injection. For example, the length of the connection pipe 140 is set to include 3 mm to 15 mm.
[0030] In some embodiments of the present application, the shape of the liquid injection part 130 can be set as a frustum of a cone to prevent the electrolyte from being injected into the dead corner of the shape of the liquid injection part 130 and being difficult to flow out. Exemplarily, the shape of the liquid injection part 130 can be set as a rectangular body, a sphere, a cylinder and other various regular or irregular shapes, all of which are within the protection scope involved in the present application.
[0031] In some embodiments of the present application, with reference to Figure 1 , it further includes: a gasket 150 disposed at the bottom of the cover 110, having a circular hole opposite to the position of the liquid injection port 120; the gasket 150 can further tightly combine the cover 110 with the battery body, prevent electrolyte leakage, and improve battery reliability. The material of the gasket 150 can be made of elastic materials such as rubber and plastic to improve the sealing of the battery electrolyte.
[0032] A terminal 160 is disposed on the cover 110. The terminal 160 can be set according to the number of electrode plates of the battery. For example, for a battery having a cathode and an anode, the number of terminals 160 can be two, corresponding to the anode plate and the cathode plate respectively, to help the battery discharge after being connected to the connection structure and the load during application.
[0033] An explosion-proof valve 170 is disposed on the cover 110, between the terminal 160 and the liquid injection port 120, and the gasket 150 at the corresponding position below the explosion-proof valve 170 is arranged in a multi-void structure.
[0034] Based on the same technical concept, the present application further provides a battery, including the battery top cover provided in the above embodiments.
[0035] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not detailedly described or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. In addition, the above embodiments can be freely combined as needed.
Claims
1. A battery top cover, characterized in that: Used to inject electrolyte into the battery cell of the battery, the battery includes multiple battery cell areas, and the battery top cover includes: A cover body having a liquid injection port formed thereon; A liquid injection part connected to the liquid injection port, wherein the liquid injection part is hollow inside and comprises: a plurality of through holes and a plurality of liquid injection pipes; The plurality of through holes are arranged at the bottom of the liquid injection portion; The plurality of injection pipes are connected to the injection port and are correspondingly connected to the plurality of battery cell regions, and are configured to simultaneously inject the electrolyte into the plurality of battery cell regions.
2. The battery top cover according to claim 1, characterized in that: The first ends of the plurality of injection pipes are arranged on the top of the injection part, the plurality of injection pipes extend outward around the bottom of the injection part, and the second ends of the plurality of injection pipes are correspondingly connected to the plurality of battery core areas.
3. The battery top cover according to claim 2, characterized in that: The liquid injection pipeline comprises: a first part and a second part; The first portion includes a first end of the injection conduit; The second part is parallel to the bottom of the liquid injection part, and the connection between the first part and the second part is arranged close to the bottom edge of the liquid injection part.
4. The battery top cover according to claim 3, characterized in that: The angle formed by the first portion and the downward extending direction of the liquid injection port is within a range of 0 to 90 degrees; The inner diameter of the liquid injection pipe is within a range of 0.2 mm to 0.5 mm.
5. The battery top cover according to any one of claims 1 to 4, characterized in that: Also includes: A connecting pipe is arranged between the liquid injection port and the top of the liquid injection part.
6. The battery top cover according to claim 5, characterized in that: The length of the connecting pipe is comprised between 3 mm and 15 mm.
7. The battery top cover according to any one of claims 1 to 4, characterized in that: The shape of the liquid injection part is a truncated cone.
8. The battery top cover according to any one of claims 1 to 4, characterized in that: Also includes: A liner is arranged at the bottom of the cover body and is provided with a circular hole corresponding to the position of the liquid injection port; The pole is arranged on the cover body.
9. The battery top cover according to any one of claims 1 to 4, characterized in that: Also includes: The diameters of the plurality of through holes range from 0.5 mm to 3 mm.
10. A battery, characterized in that: The battery top cover comprises the battery top cover according to any one of claims 1 to 9.