Lower plastic part for secondary battery top cover and secondary battery top cover
By designing an electrolyte channel with a fully-inclusive sealed structure, the problem of the electrolyte jet impacting the bare electric core and the injection hole in the prior art is solved, and the uniform dispersion of the electrolyte and the improvement of the injection efficiency are achieved.
Patent Information
- Application Number
- CN202421630967.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-11
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-11
AI Technical Summary
During the injection process, the plastic parts under the roof of the existing secondary battery have a risk that the electrolyte jet directly impacts the bare battery cell, and the injection hole occupies a large space and is easily blocked by foreign objects, affecting the injection efficiency.
A lower plastic part for the top cover of the secondary battery was designed, and an electrolyte channel with a full-inclusive seal structure without openings is used. The electrolyte solution is guided to the inner wall of the aluminum shell battery cell through the recessed part of the injection hole, the extended groove channel and the edge groove channel, so as to prevent the electrolyte jet from directly impacting the bare battery cell.
The uniform dispersion of the electrolyte during liquid injection is achieved, the risk of electrolyte washing the bare cell by the electrolyte is avoided, the efficiency of the liquid injection is improved, and foreign matters are prevented, ensuring the safety and efficiency of the battery.
Smart Images
Figure CN222914954U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of secondary batteries, and in particular relates to a lower plastic part for a secondary battery top cover. Background Art
[0002] The battery cover is an important structural component of secondary batteries, such as lithium-ion batteries, and provides flow guidance, sealing and safety functions. The lower plastic part of the cover is an important component of the secondary battery cover, mainly providing insulation and protection.
[0003] At present, most of the plastic parts under the top cover are provided with openings at the injection hole position to ensure that the electrolyte can flow into the battery cell during injection. The improved related technology achieves the effect of uniformly distributing the electrolyte by setting openings of different sizes at different distances from the bare battery cell. However, the structure is complex and occupies a large internal space. The electrolyte jet directly faces the bare battery cell, which poses a risk of impacting the electrode. There is also a method of merging the injection hole and the explosion-proof valve boss, opening a hole on the side, and limiting the insertion position of the sealing nail to prevent the electrolyte jet from directly impacting the bare battery cell. However, this technical solution has the problem that the downward opening cannot completely guarantee the impact of the electrolyte jet on the electrode bare cell during injection, and the injection hole position occupies a large space. Summary of the invention
[0004] The purpose of the present utility model is to overcome the above-mentioned shortcomings of the prior art and provide a lower plastic part for a secondary battery top cover.
[0005] The inventor has found that in the traditional technology, an opening must be set at the injection hole position, and the opening position is facing the bare battery cell. During the injection, the electrolyte jet will directly flush the bare battery cell, causing the positive and negative electrode materials coated on the positive and negative plates to peel off, which may cause the battery cell to catch fire and explode; the battery injection process is a process of alternating positive and negative pressures. When the injection is vacuumed, the opening at the injection hole position of the lower plastic part of the traditional technology is easily blocked by the negative pressure adsorption of materials such as termination tape, diaphragm, and mylar, which prolongs the vacuuming time and seriously affects the injection efficiency; the opening at the injection hole position of the lower plastic part of the traditional technology is small, and the injected electrolyte is easy to accumulate at the injection hole position, or even overflow to the outside of the battery cell. At the same time, this part of the electrolyte is easily extracted during the vacuuming step, resulting in injection leakage and reduced injection efficiency. Based on this, the utility model proposes a lower plastic part for a secondary battery top cover.
[0006] The technical solution of the utility model is as follows: the utility model first aspect provides a lower plastic part for a secondary battery top cover, the lower plastic part is provided with an electrolyte channel; the electrolyte channel comprises a liquid injection hole recessed portion arranged on the upper surface of the lower plastic part, an edge groove channel arranged along the edge of the upper surface of the lower plastic part, and an extended groove channel connecting the liquid injection hole recessed portion and the edge groove channel; a plurality of drainage holes for guiding the electrolyte in the electrolyte channel to the inner wall of the aluminum shell battery core are evenly opened on the outer side wall of the edge groove channel; the bottom end of the drainage hole is flush with the inner bottom surface of the edge groove channel.
[0007] The edge groove channel is arranged at the edges of two long sides of the upper surface of the lower plastic part.
[0008] An explosion-proof valve protection grille is provided in the middle of the upper surface of the lower plastic part; explosion-proof valve recesses are provided on the front and rear sides of the explosion-proof valve protection grille; the explosion-proof valve recess is not connected to the electrolyte channel. The explosion-proof valve recess forms an explosion-proof valve boss on the lower surface, and the height of the explosion-proof valve boss is higher than the explosion-proof valve protection grille.
[0009] The injection hole recess is located on the left side or the right side of the explosion-proof valve protection grille.
[0010] The injection hole recess, the extended groove channel, and the edge groove channel respectively form an injection hole boss, an extended channel boss, and an edge channel boss on the lower surface of the lower plastic part to enhance the structural strength of the lower plastic part; the heights of the injection hole boss, the extended channel boss, and the edge channel boss do not exceed the heights of the lower terminals of the positive and negative electrodes.
[0011] On the other hand, the utility model also provides a secondary battery top cover, including positive / negative terminals, a top cover substrate, and a lower plastic part; an electrolyte channel is provided on the lower plastic part; the electrolyte channel includes an injection hole recess provided on the upper surface of the lower plastic part and opposite to the injection hole on the top cover substrate, an edge groove channel provided along the edge of the upper surface of the lower plastic part, and an extended groove channel connecting the injection hole recess and the edge groove channel; a plurality of drainage holes for guiding the electrolyte in the electrolyte channel to the inner wall of the aluminum shell battery core are evenly provided on the outer side wall of the edge groove channel; the bottom end of the drainage hole is flush with the inner bottom surface of the edge groove channel.
[0012] The edge groove channel is arranged at the edges of two long sides of the upper surface of the lower plastic part.
[0013] An explosion-proof valve protection grille is provided in the middle of the upper surface of the lower plastic part; explosion-proof valve recesses are provided at the front and rear sides of the explosion-proof valve protection grille; and the explosion-proof valve recess is not connected to the electrolyte channel.
[0014] The injection hole recess is located on the left side or the right side of the explosion-proof valve protection grille.
[0015] The injection hole recess, the extended groove channel, and the edge groove channel respectively form an injection hole boss, an extended channel boss, and an edge channel boss on the lower surface of the lower plastic part to enhance the structural strength of the lower plastic part; the heights of the injection hole boss, the extended channel boss, and the edge channel boss do not exceed the heights of the lower terminals of the positive and negative electrodes.
[0016] The beneficial effects of the utility model are: 1) the lower plastic part is a fully enclosed sealing structure at the injection hole position without any openings, which can ensure that the termination tape, pole piece, mylar or other foreign matter cannot block the injection hole; 2) the electrolyte channel has no openings in the direction facing the bare battery cell, ensuring that the electrolyte jet will not cause scouring of the bare battery cell during injection; 3) the electrolyte channel is independent of the positive terminal boss, the negative terminal boss, and the explosion-proof valve boss, avoiding leakage from the boss opening position and affecting the winding core; 4) through the distribution of the electrolyte channel, the electrolyte injected during injection can be evenly dispersed to various parts of the edge of the bare battery cell. Generally, the battery cell has a margin design in the thickness direction. This design can ensure that the electrolyte is quickly injected and no accumulation occurs at the injection hole position; 5) the electrolyte channel opening is designed to be parallel to the thickness direction of the bare battery cell, and the electrolyte jet is sprayed directly on the inner wall of the aluminum shell. After the pressure is dissipated, the electrolyte can flow down along the inner wall, completely avoiding the jet from scouring the bare battery cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0018] Figure 1 It is a structural schematic diagram of the lower plastic part of the utility model.
[0019] Figure 2 This is the second structural schematic diagram of the lower plastic part of the utility model.
[0020] Figure 3 yes Figure 1 A magnified view of part I.
[0021] Figure 4 It is a structural schematic diagram of a secondary battery top cover of the utility model.
[0022] Figure 5 This is the second structural schematic diagram of the secondary battery top cover of the utility model. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the utility model.
[0024] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.
[0025] Figure 1-Figure 3 In the embodiment, the plastic part under the secondary battery top cover is mainly composed of the following parts: positive electrode boss 109, positive electrode terminal opening 107, explosion-proof valve boss 106', electrolyte channel, negative electrode terminal opening 108, and negative electrode boss 110. The injected electrolyte is guided to the edge through the electrolyte channel to prevent the electrolyte jet from directly impacting the bare battery cell.
[0026] The electrolyte channel includes a liquid injection hole recess 101 disposed on the upper surface of the lower plastic part 1, an edge groove channel 103 disposed along the edge of the upper surface of the lower plastic part 1, and an extended groove channel 102 connecting the liquid injection hole recess 101 and the edge groove channel 103. The edge groove channel 102 is disposed at the edges of the two long sides of the upper surface of the lower plastic part 1. A plurality of drainage holes 104 are evenly arranged on the outer side wall of the edge groove channel 103 for guiding the electrolyte in the electrolyte channel to the inner wall of the aluminum shell battery cell; the bottom end of the drainage hole 104 is flush with the inner bottom surface of the edge groove channel 103.
[0027] The injection hole recess 101, the extended groove channel 102, and the edge groove channel 103 respectively form an injection hole boss 101', an extended channel boss 102', and an edge channel boss 103' on the lower surface of the lower plastic part 1. The protrusion heights of the injection hole boss 101', the extended channel boss 102', and the edge channel boss 103' are flush with the heights of the positive electrode lower terminal part 301 and the negative electrode lower terminal part 401, which can ensure that the electrolyte channel will not lift the adapter when welding the adapter, resulting in poor welding.
[0028] The injection hole boss 101 ′, the extension channel boss 102 ′, and the edge channel boss 103 ′ also have the function of strengthening the structural strength of the plastic part under the top cover to prevent the lower plastic part from twisting and deforming.
[0029] The electrolyte channel is a group of independent channels, which are not connected with the explosion-proof valve boss and the positive and negative terminal bosses. At the same time, there are no openings on the outer surfaces of the injection hole boss and the extended channel boss, and the opening direction of the edge channel is parallel to the thickness direction of the bare battery cell.
[0030] An explosion-proof valve protection grille 105 is provided in the middle of the upper surface of the lower plastic part 1; two explosion-proof valve recesses 106 are provided on the front and rear sides of the explosion-proof valve protection grille 105; the explosion-proof valve recesses are not connected to the electrolyte channel. The explosion-proof valve recesses 106 form an explosion-proof valve boss 106' on the lower surface, and the height of the explosion-proof valve boss 106' is higher than the explosion-proof valve protection grille 105.
[0031] There are no openings on the side walls of the injection hole recess 101 and the extended groove channel 102 extending to the edge of the plastic part. When the extended groove channel 102 reaches the edge of the plastic part, it forks to the left and right to form left and right edge groove channels 103. The left and right edge groove channels 103 are parallel to the thickness direction of the bare battery cell and are provided with a number of electrolyte drainage holes 104. The lower edge of the drainage hole 104 is flush with the lower edge plane of the plastic part.
[0032] The edges of the positive terminal opening 107 and the negative terminal opening 108 are provided with a positive terminal boss 109 and a negative terminal boss 110 which are shaped like the positive and negative terminals, and can fix the positive and negative terminals to prevent the terminals from twisting.
[0033] Working process: During injection, the electrolyte enters the battery from the injection hole on the top cover, and the injected electrolyte flows along the injection hole recess 101 and the extended groove channel 102 to reach the left and right edge groove channels 103, and is sprayed onto the inner wall of the aluminum shell battery cell from the drainage holes 104 of the left and right edge groove channels 103. After the pressure of the electrolyte jet is reduced, it flows into the interior along the inner wall, and most of it is absorbed by the bare battery cell, while a small amount of electrolyte is retained in the internal gap of the aluminum shell battery cell.
[0034] Figure 4 , Figure 5 In another aspect, the utility model provides a secondary battery top cover, comprising a positive terminal 3, a negative terminal 4, a top cover substrate 2, a lower plastic part 1, and an explosion-proof valve protection sheet 5. An electrolyte channel is provided on the lower plastic part 1; the electrolyte channel comprises an injection hole recess 101 provided on the upper surface of the lower plastic part 1 and opposite to the injection hole 201 on the top cover substrate 2, an edge groove channel 103 provided along the edge of the upper surface of the lower plastic part 1, and an extended groove channel 102 connecting the injection hole recess 101 and the edge groove channel 103; a plurality of drainage holes 104 for guiding the electrolyte in the electrolyte channel to the inner wall of the aluminum shell battery cell are evenly provided on the outer side wall of the edge groove channel 103; the bottom end of the drainage hole 104 is flush with the inner bottom surface of the edge groove channel 103.
[0035] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A lower plastic part for a secondary battery top cover, characterized in that: The lower plastic part is provided with an electrolyte channel; the electrolyte channel comprises an injection hole recess provided on the upper surface of the lower plastic part, an edge groove channel provided along the edge of the upper surface of the lower plastic part, and an extended groove channel connecting the injection hole recess and the edge groove channel; a plurality of drainage holes for guiding the electrolyte in the electrolyte channel to the inner wall of the aluminum shell are evenly provided on the outer side wall of the edge groove channel; the bottom end of the drainage hole is flush with the inner bottom surface of the edge groove channel.
2. The lower plastic part for the secondary battery top cover according to claim 1, characterized in that: The edge groove channel is arranged at the edges of two long sides of the upper surface of the lower plastic part.
3. The lower plastic part for the secondary battery top cover according to claim 1, characterized in that: An explosion-proof valve protection grille is provided in the middle of the upper surface of the lower plastic part; explosion-proof valve recesses are provided at the front and rear sides of the explosion-proof valve protection grille; and the explosion-proof valve recess is not connected to the electrolyte channel.
4. The lower plastic part for the secondary battery top cover according to claim 3, characterized in that: The injection hole recess is located on the left side or the right side of the explosion-proof valve protection grille.
5. The lower plastic part for the secondary battery top cover according to claim 1, characterized in that: The injection hole recess, extended groove channel and edge groove channel respectively form an injection hole boss, an extended channel boss and an edge channel boss on the lower surface of the lower plastic part; the heights of the injection hole boss, the extended channel boss and the edge channel boss do not exceed the heights of the lower terminals of the positive and negative electrodes.
6. A secondary battery top cover, comprising a positive / negative terminal, a top cover substrate, and a lower plastic part; characterized in that: The lower plastic part is provided with an electrolyte channel; the electrolyte channel includes an injection hole recess provided on the upper surface of the lower plastic part and opposite to the injection hole on the top cover substrate, an edge groove channel provided along the edge of the upper surface of the lower plastic part, and an extended groove channel connecting the injection hole recess and the edge groove channel; a plurality of drainage holes for guiding the electrolyte in the electrolyte channel to the inner wall of the aluminum shell battery cell are evenly provided on the outer side wall of the edge groove channel; the bottom end of the drainage hole is flush with the inner bottom surface of the edge groove channel.
7. The secondary battery top cover according to claim 6, characterized in that: The edge groove channel is arranged at the edges of two long sides of the upper surface of the lower plastic part.
8. The secondary battery top cover according to claim 6, characterized in that: An explosion-proof valve protection grille is provided in the middle of the upper surface of the lower plastic part; explosion-proof valve recesses are provided at the front and rear sides of the explosion-proof valve protection grille; and the explosion-proof valve recess is not connected to the electrolyte channel.
9. The secondary battery top cover according to claim 8, characterized in that: The injection hole recess is located on the left side or the right side of the explosion-proof valve protection grille.
10. The secondary battery top cover according to claim 6, characterized in that: The injection hole recess, extended groove channel and edge groove channel respectively form an injection hole boss, an extended channel boss and an edge channel boss on the lower surface of the lower plastic part; the heights of the injection hole boss, the extended channel boss and the edge channel boss do not exceed the heights of the lower terminals of the positive and negative electrodes.