Battery top cover and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery top cover and a battery, the battery top cover is used for performing electrolyte injection on a battery cell of the battery, the battery comprises a plurality of battery cell areas, and the battery top cover comprises a cover body, a top cover body and a top cover body, the liquid injection part is connected with the liquid injection opening, the interior of the liquid injection part is hollow, and the liquid injection part comprises a plurality of through holes and a plurality of liquid injection pipelines; the through holes are formed in the bottom of the liquid injection part; and the plurality of liquid injection pipelines are connected with the liquid injection port, are correspondingly connected with the plurality of battery cell areas, and are configured to synchronously inject the electrolyte into the plurality of battery cell areas. The device has the technical characteristics that the battery cell is prevented from being impacted by injected electrolyte, the electrolyte is synchronously injected into a plurality of battery cell areas at the same time, the infiltration consistency of pole pieces in the battery cell is good, and the electrolyte injection efficiency is high.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery top cover and a battery. This application is a divisional application of "A Battery Top Cover and Battery" (filed on July 16, 2024, patent number ZL202421674631.7). Background Technology

[0002] In the new energy industry, lithium-ion batteries, as a key core component, are widely used in power, energy storage, and 3C fields. Therefore, the safety and stability of lithium-ion batteries are receiving increasing attention. During battery production, electrolyte needs to be added to the battery cells. This injection is often done vertically into a fixed position within the cell through an injection port. This direct injection method can easily impact the cell, potentially causing damage. Furthermore, the direct injection method results in low electrolyte diffusion efficiency, leading to inconsistent wetting of the electrodes within the cell. This problem is particularly pronounced when the cell volume is large, highlighting issues such as low injection efficiency and uneven injection. Utility Model Content

[0003] In view of this, this application provides a battery top cover and a battery to solve the problems of low and uneven electrolyte injection efficiency. In a first aspect, a battery top cover is provided for injecting electrolyte into the battery cells. The battery includes multiple cell regions. The battery top cover includes: a cover body with an injection port; an injection section connected to the injection port, and the injection section is hollow inside, including: multiple through holes and multiple injection pipes; the multiple through holes are disposed at the bottom of the injection section; the multiple injection pipes are connected to the injection port and correspondingly connected to the multiple cell regions, configured to simultaneously inject electrolyte into the multiple cell regions.

[0004] The battery top cover is equipped with multiple through holes and multiple injection pipes in the injection section, which reduces the impact of electrolyte on the battery cell when the electrolyte enters from the injection port. Furthermore, multiple injection pipes can simultaneously inject electrolyte into multiple battery cell areas, promoting uniform wetting of the electrode plates inside the battery cell. It is not necessary to inject electrolyte into the next battery cell area after the previous one has been injected, resulting in high electrolyte injection efficiency.

[0005] Optionally, the first end of the multiple liquid injection pipes is located at the top of the liquid injection section, the multiple liquid injection pipes extend outward around the bottom of the liquid injection section, and the second end of the multiple liquid injection pipes is connected to multiple cell areas.

[0006] Optionally, the injection conduit includes: a first part and a second part; the first part includes a first end of the injection conduit; the second part is parallel to the bottom of the injection section, and the connection between the first part and the second part is located near the bottom edge of the injection section.

[0007] Optionally, the angle formed between the first part and the downward extension direction of the injection port includes 0 degrees to 90 degrees; the inner diameter of the injection pipe includes 0.2 mm to 0.5 mm.

[0008] Optionally, it also includes: a connecting pipe disposed between the injection port and the top of the injection section.

[0009] Optionally, the length of the connecting pipe can range from 3 mm to 15 mm.

[0010] Optionally, the injection section is shaped like a frustum.

[0011] Optionally, it also includes: a gasket, disposed at the bottom of the cover, having a circular hole on it opposite to the position of the injection port; and an electrode post, disposed on the cover.

[0012] Optionally, the diameter of the multiple through holes may range from 0.5 mm to 3 mm.

[0013] In a second aspect, a battery is provided, including the battery top cover of the first aspect above. Attached Figure Description

[0014] The following is a brief introduction to the accompanying drawings used in the description of the embodiments of this application:

[0015] Figure 1 The diagram shows a structural schematic of a battery top cover provided in some embodiments of this application;

[0016] Figure 2 The following are schematic diagrams of the liquid injection section structure provided in some embodiments of this application;

[0017] Figure 3 This paper shows a cross-sectional schematic diagram of the connection between the injection pipe and the injection port provided in some embodiments of this application;

[0018] Figure 4 A top view of the injection section provided in some embodiments of this application is shown;

[0019] Figure 5 A schematic diagram of the injection pipeline structure provided in some embodiments of this application is shown.

[0020] Explanation of reference numerals: 100-Battery top cover, 110-Cover body, 120-Injection port, 130-Injection section, 131-Through hole, 132-Injection pipe, 1321-First part, 1322-Second part, 140-Connecting pipe, 150-Gasket, 160-Terminal post, 170-Explosion-proof valve. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the specific implementation methods of this application will be described below with reference to the accompanying drawings. The accompanying drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings or embodiments can be obtained based on these drawings or embodiments without creative effort. Adjustments and improvements made without departing from the concept of this application are all within the protection scope of this application.

[0022] To keep the drawings simple, each figure only schematically shows the parts relevant to the embodiment, and they do not represent the actual structure of the product. In addition, for the sake of clarity and ease of understanding, some figures only schematically show parts of components with the same structure or function, and there may actually be more or fewer components with the same structure or function.

[0023] In this application, unless otherwise expressly specified and limited, ordinal numbers, such as "first," "second," etc., are used only to distinguish and describe related objects, and should not be construed as indicating or implying the relative importance or order between related objects; furthermore, they do not represent the quantity of related objects. "Multiple" includes two or more, and other quantifiers are similar. " / " is used to describe the relationship between related objects, indicating an "or" relationship between them. "And / or" is used to describe the relationship between related objects, including any combination relationship between them, such as "a and / or b" including: "a alone," "b alone," or "a and b." "One or more" or "at least one" of multiple objects refers to any object or any combination of multiple objects, such as "one or more of a1, a2, a3" or "at least one of a1, a2, a3" including: "a1 alone," "a2 alone," "a3 alone," "a1 and a2," "a1 and a3," "a2 and a3," or "a1, a2 and a3."

[0024] In the new energy industry, lithium-ion batteries, as a key core component, are widely used in power, energy storage, and 3C fields. Therefore, the safety and stability of lithium-ion batteries are receiving increasing attention. During battery production, electrolyte needs to be added to the battery cells. Currently, the main structure of a lithium-ion battery includes the cell, casing, and top cover assembly. The top cover has an injection port. During injection, the electrolyte is often vertically injected into a fixed position within the cell through this port. However, the electrolyte can easily impact the cell during injection, potentially causing damage. Furthermore, direct injection results in low electrolyte diffusion efficiency, leading to inconsistent wetting of the electrodes within the cell. Especially in new energy vehicles or energy storage technologies, where batteries and cells are large, low injection efficiency and uneven injection can easily lead to uneven wetting of the battery electrodes, resulting in an imbalance in the redox reaction and posing safety risks during battery production.

[0025] Please refer to Figure 1 This document illustrates a schematic diagram of a battery top cover provided in some embodiments of this application. The battery top cover 100 is used for injecting electrolyte into the battery cells. The battery includes multiple cell regions. The battery top cover 100 includes: a cover body 110 with an injection port 120; and an injection section 130 connected to the injection port 120, the injection section 130 being hollow internally. Please refer to... Figure 2 The diagram shows a schematic of the liquid injection section structure provided in some embodiments of this application. The liquid injection section 130 includes: a plurality of through holes 131 and a plurality of liquid injection pipes 132; the plurality of through holes 131 are disposed at the bottom of the liquid injection section 130; the plurality of liquid injection pipes 132 are connected to the liquid injection port 120 and are correspondingly connected to a plurality of battery cell regions, and are configured to inject electrolyte into the plurality of battery cell regions simultaneously.

[0026] Traditional direct electrolyte injection top cover structures and injection methods, when the battery comprises multiple cell areas, may be isolated or far apart. Direct injection may require filling one cell area with electrolyte, then using the overflowing electrolyte to continue adding other electrolytes, resulting in uneven electrolyte injection across multiple cell areas. Furthermore, electrolytes are often corrosive, and direct injection, if performed too quickly, can impact the fragile electrolyte-containing spaces within the cell area, causing deformation or damage. In this application, the electrolyte enters the injection section 130 through the injection port 120. The electrolyte is divided into two main parts. The first part is injected directly into the cell area below the injection section 130 through multiple through holes 131. These through holes 131 effectively mitigate the impact force of the electrolyte during injection, allowing it to flow out and preventing impact on the inner wall of the cell. The second part of the electrolyte enters multiple injection pipes 132, which directly connect to multiple cell areas of the battery. This allows multiple cell areas to be injected with electrolyte simultaneously, eliminating the need to wait for one cell area to be filled before overflowing into others, thus achieving uniform electrolyte injection. The diameter of the multiple through holes 131 can be set based on the required amount and efficiency of electrolyte injection, thereby controlling the speed at which the electrolyte flows into the cell area. For example, the diameter of the through holes 131 can be set from 0.5 mm to 3 mm.

[0027] In some embodiments of this application, reference is made to Figure 3This diagram shows a top view of the electrolyte injection section provided in some embodiments of this application. The first ends of a plurality of electrolyte injection pipes 132 are disposed at the top of the electrolyte injection section 130, and the plurality of electrolyte injection pipes 132 extend outwards around the bottom of the electrolyte injection section 130. The second ends of the plurality of electrolyte injection pipes 132 are correspondingly connected to a plurality of battery cell regions. The shape of the electrolyte injection port 120 may be circular, and the plurality of electrolyte injection pipes 132 are evenly arranged along the edge of the circular electrolyte injection port 120. Electrolyte that fails to enter the electrolyte injection pipes 132 through the electrolyte injection port 120 can enter the interior of the electrolyte injection section 130 and flow out to the battery cell region through a plurality of through holes 131. (Reference) Figure 4 Multiple injection pipes 132 can be evenly arranged along the bottom edge of the injection section 130 and extend outward until they reach the cell area corresponding to the injection pipe 132.

[0028] Please refer to Figure 4 This illustration shows a schematic diagram of the electrolyte injection pipe structure provided in some embodiments of this application. The electrolyte injection pipe 132 includes: a first portion 1321 and a second portion 1322; the first portion 1321 includes a first end of the electrolyte injection pipe; the second portion 1322 is parallel to the bottom of the electrolyte injection section 130, and the connection between the first portion 1321 and the second portion 1322 is located near the bottom edge of the electrolyte injection section 130. The arrangement of the first portion 1321 allows the electrolyte to flow more smoothly into the electrolyte injection pipe 132, while the parallel arrangement of the second portion 1322 to the bottom of the electrolyte injection section 130 allows the electrolyte to flow out more evenly and be delivered to the corresponding cell area. For example, the inner diameter of the injection pipe 132 can be adjusted according to the battery size and electrolyte injection volume requirements to better control the efficiency of electrolyte injection. For example, the inner diameter of the injection pipe can be set to 0.2 mm to 0.5 mm. The first part 1321 forms an angle with the downward extension direction of the injection port 120 to guide the electrolyte. For example, the angle can be set to 0 degrees to 90 degrees.

[0029] In some embodiments of this application, reference is made to Figure 5 It also includes a connecting pipe 140, disposed between the top of the injection port 120 and the injection section 130, to guide electrolyte from the injection port 120 and facilitate the flow of electrolyte into the injection pipe 132, thereby improving electrolyte injection efficiency. The length of the connecting pipe 140 can be set according to the required amount of electrolyte injection, for example, the length of the connecting pipe 140 can be set from 3 mm to 15 mm.

[0030] In some embodiments of this application, the shape of the injection section 130 can be configured as a frustum, thereby preventing the electrolyte from being injected into dead corners of the injection section 130 shape and making it difficult to flow out. For example, the shape of the injection section 130 can be configured as a rectangular body, a sphere, a cylinder, or other regular or irregular shapes, all of which are within the scope of protection of this application.

[0031] In some embodiments of this application, reference is made to Figure 1 It also includes a gasket 150, which is disposed at the bottom of the cover 110 and has a circular hole on it that is opposite to the position of the electrolyte inlet 120. The gasket 150 can further tighten the cover 110 with the battery body, prevent electrolyte leakage, and improve battery reliability. The gasket 150 can be made of elastic materials such as rubber or plastic to improve the sealing of the battery electrolyte.

[0032] The terminal post 160 is disposed on the cover 110. The terminal post 160 can be configured according to the number of electrode plates of the battery. For example, for a battery with a cathode and an anode, there can be two terminal posts 160, corresponding to the anode plate and the cathode plate respectively, to help the battery discharge after being connected to the connection structure and load during application.

[0033] An explosion-proof valve 170 is installed on the cover 110, located between the pole 160 and the injection port 120. The gasket 150 at the corresponding position below the explosion-proof valve 170 is configured with a multi-pore structure.

[0034] Based on the same technical concept, this application also 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 emphasis. Parts not described in detail or in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Furthermore, the above embodiments can be freely combined as needed.

Claims

1. A battery top cover, characterized in that, For injecting electrolyte into the cells of a battery, the battery comprising multiple cell regions, and the battery top cover comprising: The cap has an injection port on it; The injection section is connected to the injection port, and the injection section is hollow inside, including: multiple injection pipes; The plurality of injection pipes are connected to the injection port and correspondingly connected to the plurality of cell regions, and are configured to simultaneously inject the electrolyte into the plurality of cell regions.

2. The battery header of claim 1, wherein, The battery top cover also includes: A gasket is provided at the bottom of the cover body, and the gasket has a circular hole opposite to the position of the injection port; An explosion-proof valve is installed on the cover, and the gasket at the corresponding position below the explosion-proof valve is configured as a multi-pore structure; The pole is mounted on the cover.

3. The battery top cover according to claim 1 or 2, characterized in that, The injection section also includes a plurality of through holes, which are disposed at the bottom of the injection section; The first end of the plurality of liquid injection pipes is disposed at the top of the liquid injection section, the plurality of liquid injection pipes extend outward around the bottom of the liquid injection section, and the second end of the plurality of liquid injection pipes is correspondingly connected to the plurality of battery cell areas.

4. The battery header of claim 3, wherein, The injection pipeline 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 between the first part and the second part is located near the bottom edge of the injection part.

5. The battery top cover according to claim 4, characterized in that, The angle formed between the first portion and the downward extension direction of the injection port includes 0 degrees to 90 degrees; The inner diameter of the injection pipe ranges from 0.2 mm to 0.5 mm.

6. The battery cover of claim 1 or 2, wherein the cover is made of a material selected from the group consisting of: aluminum, steel, and stainless steel. Also includes: A connecting pipe is disposed between the injection port and the top of the injection section.

7. The battery top cover according to claim 6, characterized in that, The length of the connecting pipe ranges from 3 mm to 15 mm.

8. The battery header of claim 1 or 2, wherein, The injection section is shaped like a frustum; and / or The plurality of injection pipes are evenly arranged along the edge of the circular injection port.

9. The battery top cover according to claim 3, characterized in that, Also includes: The diameter of the plurality of through holes ranges from 0.5 mm to 3 mm.

10. A battery, characterized in that, Includes the battery top cover as described in any one of claims 1-9.

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