A cover plate assembly and a battery cell
Patent Information
- Application Number
- CN202521775450.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-08-20
AI Technical Summary
[0004]然而，由于上述过程需要多次插拔弹性密封钉，费时费力，增加了工艺步骤，影响了整个电池单体的生产效率
[0023]通过在盖板上设置注液孔，在凸座设置沿其径向贯穿的通孔，通孔与壳体内部连通，并在凸座内设置弹性密封件，使弹性密封件的顶端能够抵接于注液孔外周的底面，弹性密封件的底端抵接于凸座的内底面，使得弹性密封件能够发生弹性形变以连通或隔断注液孔与通孔，也即是，能够根据实际使用需求使弹性密封件发生弹性形变，从而能够使注液孔通过弹性密封件和通孔与壳体内部连通，以实现注液、静置、二次注液或清洗工艺；也能够使注液孔通过弹性密封件与壳体内部隔断，即可实现对注液孔的短暂密封；通过这种设置，不再需要多次插拔弹性密封件，只需要使弹性密封件产生弹性形变即可通过注液孔注液或短暂密封注液孔，省时省力，减少了工艺步骤，极大地提高了整个电池单体的生产效率。
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Figure CN224652510U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Technology
[0002] A single battery cell mainly consists of a casing, a cell, a cover plate assembly, and electrolyte injected into the casing through a liquid injection process. The liquid injection process typically involves injecting electrolyte into the casing through a liquid injection hole on the cover plate assembly after the casing, cell, and cover plate assembly are assembled. Since the liquid injection process is followed by a settling period, a second liquid injection, and a cleaning process, and the liquid injection hole is always exposed on the outside during these processes, foreign objects can easily enter the cell through the liquid injection hole and affect the cell.
[0003] To solve the above problems, the elastic sealing pin is usually inserted into the injection hole to achieve a temporary seal. When performing the standing, secondary injection, or cleaning process, the elastic sealing pin can be pulled out of the injection hole.
[0004] However, the above process requires multiple insertions and removals of the elastic sealing pins, which is time-consuming and labor-intensive, increases the number of process steps, and affects the overall production efficiency of the battery cell.
[0005] To address the above issues, there is an urgent need for a cover plate assembly and a battery cell to solve these problems. Utility Model Content
[0006] The purpose of this invention is to provide a cover plate assembly and a battery cell that can achieve isolation and communication between the liquid injection hole and the inside of the casing without repeatedly inserting and removing the elastic seal, saving time and effort, reducing process steps, and greatly improving the production efficiency of the entire battery cell.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] A cover assembly, disposed over an opening in the housing, includes:
[0009] A cover plate, wherein the cover plate is provided with an injection hole;
[0010] The lower plastic is located on the side of the cover plate facing the inside of the housing. The side of the lower plastic facing the inside of the housing has a protrusion. A through hole is provided through the seat wall of the protrusion, and the through hole communicates with the inside of the housing.
[0011] An elastic seal is disposed within the protrusion. The top end of the elastic seal abuts against the bottom surface of the outer periphery of the injection hole, and the bottom end of the elastic seal abuts against the inner bottom surface of the protrusion. The elastic seal is capable of elastic deformation to connect or disconnect the injection hole from the through hole.
[0012] As an optional solution, the elastic seal is provided with an injection groove corresponding to and communicating with the injection hole. The wall of the injection groove is provided with a strip-shaped slit extending along the Z-axis direction, which is parallel to the thickness direction of the cover plate. The strip-shaped slit penetrates the side wall of the injection groove.
[0013] The strip-shaped seam has a closed state and an open state. When the elastic seal elastically deforms along the Z-axis, the strip-shaped seam is in the open state, and when the elastic seal returns to its original state, the strip-shaped seam is in the closed state.
[0014] As an optional solution, multiple through holes and multiple strip slots are provided, with each through hole being evenly arranged along the circumference of the protrusion, and one through hole corresponding to one strip slot.
[0015] As an alternative, the projection of the injection groove along the Z-axis is located inside the injection hole, so that it can pass through the injection hole and press against the top of the elastic seal, causing the elastic seal to deform elastically.
[0016] As an optional solution, the protrusion is provided with a receiving groove communicating with the through hole, the elastic seal is placed in the receiving groove, and there is a gap between the outer wall of the elastic seal and the inner wall of the receiving groove.
[0017] As an optional solution, a limiting member is connected to the side of the cover plate facing the inside of the housing. The limiting member is located on the outer periphery of the injection hole and is used to abut against the outer side wall of the elastic seal to limit the elastic seal into the receiving groove.
[0018] Alternatively, the injection groove can be a blind hole extending along the Z-axis.
[0019] As an optional solution, the injection groove is a through groove that penetrates the elastic seal along the Z-axis direction, and the bottom of the injection groove abuts against the inner bottom surface of the boss.
[0020] As an optional solution, one of the lower plastic and the cover plate is provided with a connecting groove, and the other is provided with a connecting protrusion. The connecting protrusion is located on the outer periphery of the elastic seal and can be engaged in the connecting groove.
[0021] A battery cell includes a cell, a housing, and a cover assembly as described above, the cover assembly being used to encapsulate the cell inside the housing.
[0022] The beneficial effects of this utility model are as follows:
[0023] By setting an injection hole on the cover plate and a through hole running radially through the boss, which communicates with the inside of the housing, and by setting an elastic seal inside the boss, the top end of the elastic seal can abut against the bottom surface of the outer periphery of the injection hole, and the bottom end of the elastic seal abuts against the inner bottom surface of the boss. This allows the elastic seal to undergo elastic deformation to connect or disconnect the injection hole and the through hole. In other words, the elastic seal can be elastically deformed according to actual usage requirements, so that the injection hole can be connected to the inside of the housing through the elastic seal and the through hole to realize injection, settling, secondary injection, or cleaning processes; or the injection hole can be isolated from the inside of the housing through the elastic seal to achieve temporary sealing of the injection hole. With this setting, it is no longer necessary to repeatedly insert and remove the elastic seal. Only the elastic deformation of the elastic seal is needed to inject liquid through the injection hole or temporarily seal the injection hole, saving time and effort, reducing process steps, and greatly improving the production efficiency of the entire battery cell. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of the battery cell (with the strip slit in a closed state) provided in this utility model. Figure 1 ;
[0025] Figure 2 yes Figure 1 A partially enlarged structural diagram of point A (the injection tank is a blind hole);
[0026] Figure 3 yes Figure 2 The diagram shows the structure of the injection tank when it is a through-hole tank;
[0027] Figure 4 This is a schematic diagram of the structure of the battery cell (with the slit in the open state) provided in this utility model. Figure 2 ;
[0028] Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point B;
[0029] Figure 6 This is an exploded structural diagram of the cover plate assembly provided in this utility model;
[0030] Figure 7 yes Figure 6 A magnified schematic diagram of the structure at point C.
[0031] Explanation of reference numerals in the attached figures:
[0032] 10 - Cover assembly; 20 - Housing; 30 - Battery cell;
[0033] 1-Cover plate; 11-Injection hole; 12-Stepped surface; 13-Limiting component;
[0034] 2-Lower plastic; 21-Protrusion; 211-Through hole; 212-Receiving groove; 22-Connecting protrusion;
[0035] 3-Elastic seal; 31-Injection groove; 32-Strip groove. Detailed Implementation
[0036] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.
[0037] Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.
[0038] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0039] like Figures 1 to 4 As shown, this embodiment proposes a cover plate assembly 10 and a battery cell including the cover plate assembly 10. The battery cell further includes a cell 30 and a housing 20. The cell 30 is disposed inside the housing 20. The cover plate assembly 10 covers the opening of the housing 20 so that the cover plate assembly 10 encapsulates the cell 30 inside the housing 20. Specifically, the battery cell can be a square battery cell. Figure 1 and Figure 4 For the purpose of illustrating the battery cell 30, in the actual structure, the battery cell 30 is located inside the housing 20.
[0040] It is worth noting that the main improvement in this embodiment lies in the specific structure of the cover plate assembly 10. Here, the specific working principle of the battery cell will not be described in detail, but can be referred to the working principle of the existing battery cell.
[0041] Specifically, such as Figure 2 and Figure 5As shown, the cover plate assembly 10 includes a cover plate 1, a lower plastic 2, and an elastic sealing member 3. The cover plate 1 has an injection hole 11. The lower plastic 2 is located on the side of the cover plate 1 facing the interior of the housing 20. A boss 21 is located on the side of the lower plastic 2 facing the interior of the housing 20. A through hole 211 is provided through the seat wall of the boss 21, and the through hole 211 communicates with the interior of the housing 20. The elastic sealing member 3 is located inside the boss 21. The top end of the elastic sealing member 3 abuts against the bottom surface of the outer periphery of the injection hole 11, and the bottom end of the elastic sealing member 3 abuts against the inner bottom surface of the boss 21. The elastic sealing member 3 can undergo elastic deformation to connect or disconnect the injection hole 11 and the through hole 211.
[0042] Compared to the prior art, the cover plate assembly 10 in this embodiment features an elastically deformable sealing element 3 between the cover plate 1 and the lower plastic 2. The elastic deformation of the sealing element 3 connects or disconnects the injection hole 11 and the through hole 211. That is, the sealing element 3 can be elastically deformed according to actual usage requirements, allowing the injection hole 11 to communicate with the interior of the housing 20 through the sealing element 3 and the through hole 211, enabling injection, settling, secondary injection, or cleaning processes. Alternatively, the sealing element 3 can be used to disconnect the injection hole 11 from the interior of the housing 20, achieving a temporary seal. This design eliminates the need for repeated insertion and removal of the sealing element 3; simply causing the sealing element 3 to elastically deform is sufficient for injection or temporary sealing of the injection hole 11, saving time and effort, reducing process steps, and significantly improving the overall production efficiency of the battery cell.
[0043] Specifically, the elastic seal 3 can be an elastic sealing plug. Here, the specific material of the elastic seal 3 is not limited, as long as the elastic seal 3 can undergo elastic deformation; and the boss 21 and the lower plastic 2 can be an integral structure.
[0044] Furthermore, such as Figure 6 and Figure 7 As shown, the elastic seal 3 is provided with an injection groove 31 that communicates with the injection hole 11. The groove wall of the injection groove 31 is provided with a strip slit 32 extending along the Z-axis direction. The strip slit 32 penetrates the side wall of the injection groove 31 radially. The strip slit 32 has a closed state and an open state. When the elastic seal 3 elastically deforms along the Z-axis direction, the strip slit 32 is in the open state. When the elastic seal 3 returns to its original state, the strip slit 32 is in the closed state.
[0045] Specifically, when the elastic seal 3 is pressed downwards along the Z-axis to cause elastic deformation, the slot 32 widens under the elastic deformation of the elastic seal 3, such as... Figure 5As shown, at this time, the strip slit 32 is in the open state, so that the injection groove 31 and the through hole 211 can be connected through the strip slit 32 with the increased gap, thereby connecting the injection hole 11 and the inside of the housing 20 to facilitate injection; when the elastic seal 3 is no longer pressed downward along the Z-axis direction, the elastic seal 3 recovers its elastic deformation upward along the Z-axis direction, and the gap of the strip slit 32 becomes smaller under the action of the recovery elastic deformation of the elastic seal 3, until the gap of the strip slit 32 becomes smaller and is in the closed state, as shown. Figure 2 As shown, the injection groove 31 and the through hole 211 are separated by a closed strip slit 32, thereby isolating the injection hole 11 from the interior of the housing 20. The Z-axis direction is parallel to the thickness direction of the cover plate 1.
[0046] like Figure 2 and Figure 5 As shown, the elastic deformation of the elastic seal 3 changes the size of the slot 32, thereby achieving communication or isolation between the injection hole 11 and the interior of the housing 20. The operation is simple and convenient, and it ensures a good temporary seal for the injection hole 11 without affecting the injection process. Specifically, when injection is required, the injection needle is inserted downwards along the Z-axis into the injection hole 11 and abuts against the top of the elastic seal 3, allowing the injection needle to press downwards against the elastic seal 3 along the Z-axis.
[0047] Furthermore, after the injection, settling, secondary injection, and cleaning processes, it is not necessary to remove the elastic seal 3 from the boss 21, such as... Figure 2 and Figure 5 As shown, the elastic sealing nail can be directly welded to the stepped surface 12 on the outer periphery of the injection hole 11 on the cover plate 1, so that the injection hole 11 can be permanently sealed by welding through the elastic sealing nail; that is, the injection hole 11 is temporarily sealed by the elastic sealing element 3, and the injection hole 11 is permanently sealed by the elastic sealing nail.
[0048] By providing the elastic seal 3, during the process of welding the elastic seal pin to the step surface 12 as described above, at this time, as... Figure 2 As shown, the strip slit 32 on the elastic seal 3 is in a closed state, thereby preventing welding impurities from entering the housing 20 through the sealing and blocking effect of the elastic seal 3. This prevents welding impurities from entering the battery cell 30 inside the housing 20 through the liquid injection hole 11 during the welding sealing process and affecting the battery cell 30, thus better protecting the battery cell 30.
[0049] Furthermore, such as Figure 2 , Figure 5 and Figure 7As shown, multiple through holes 211 and strip slots 32 are provided. Each through hole 211 is evenly arranged along the circumference of the boss 21, and one through hole 211 corresponds to one strip slot 32. Here, the specific number of through holes 211 and strip slots 32 is not limited.
[0050] By using uniformly arranged and corresponding through holes 211 and strip slits 32, on the one hand, it can be ensured that the injection hole 11 is connected to the inside of the housing 20 through each strip slit 32 and each through hole 211, thereby ensuring the smoothness and flow of electrolyte being injected into the housing 20; on the other hand, by allowing the electrolyte in the injection hole 11 to flow into the inside of the housing 20 through each uniformly arranged through hole 211, the uniformity of electrolyte flow can be ensured, thereby ensuring that the electrolyte flows into the inside of the housing 20 relatively evenly and gently, so as to avoid the electrolyte impacting the battery cell 30.
[0051] Specifically, such as Figure 2 and Figure 5 As shown, along the Z-axis direction, the projection of the injection groove 31 is located inside the injection hole 11. That is, the inner sidewall of the injection hole 11 is spaced apart from the outer periphery of the groove wall of the injection groove 31, so that the elastic seal 3 can provide a pressurized position for the injection needle, so as to ensure that the injection needle passes through the injection hole 11 downward along the Z-axis direction and presses smoothly against the top of the elastic seal 3, so that the elastic seal 3 undergoes elastic deformation.
[0052] Furthermore, such as Figure 2 , Figure 5 and Figure 7 As shown, a receiving groove 212 communicating with the through hole 211 is provided in the boss 21. The elastic seal 3 is placed in the receiving groove 212, and there is a gap between the outer wall of the elastic seal 3 and the inner wall of the receiving groove 212. On the one hand, the gap can provide space for the elastic seal 3 to be elastically deformable, so as to avoid the receiving groove 212 from blocking or interfering with the elastic deformation of the elastic seal 3. On the other hand, the gap can provide space for the electrolyte to flow, so as to ensure that the electrolyte in the open strip slit 32 can flow smoothly to each through hole 211 through the gap.
[0053] Specifically, such as Figure 2 and Figure 5 As shown, a limiting member 13 is connected to the side of the cover plate 1 facing the inside of the housing 20. The limiting member 13 is located on the outer periphery of the injection hole 11 and below the stepped surface 12. The limiting member 13 is used to abut against the outer wall of the elastic seal 3 so that the elastic seal 3 can be limited in the receiving groove 212 by the limiting member 13, so as to prevent the elastic seal 3 from shaking or moving in the receiving groove 212.
[0054] Specifically, the limiting member 13 can be an annular limiting protrusion that abuts against the outer peripheral surface of the elastic seal 3 to limit the elastic seal 3 within the receiving groove 212. Alternatively, the limiting member 13 can be a plurality of protrusions arranged in annular patterns, each protrusion abutting against the outer peripheral surface of the elastic seal 3 to limit the elastic seal 3 within the receiving groove 212. Here, the specific structure of the limiting member 13 is not limited, as long as it can limit the elastic seal 3 within the receiving groove 212.
[0055] Furthermore, such as Figure 2 and Figure 5 As shown, the limiting member 13 has a preset height along the Z-axis. When it presses down against the elastic seal 3 along the Z-axis, the elastic seal 3 undergoes elastic deformation and moves a small distance downward along the Z-axis. At this time, the top of the elastic seal 3 no longer abuts against the bottom surface of the outer periphery of the injection hole 11. The top of the elastic seal 3 moves downward along the Z-axis towards the bottom of the limiting member 13. At this time, the limiting member 13 with the preset height can still abut against the outer wall of the elastic seal 3. That is, when the strip slit 32 is in the open state, the limiting member 13 can still stably limit and abut against the elastic seal 3 in the receiving groove 212. Here, the preset height of the limiting member 13 is not limited, as long as it can ensure that the limiting member 13 can still stably limit and abut against the elastic seal 3 in the receiving groove 212 when the elastic seal 3 undergoes elastic deformation.
[0056] Specifically, such as Figure 2 As shown, when the strip slit 32 is in the closed state, the limiting member 13 abuts against the outer wall of the elastic seal 3, so as to prevent electrolyte from entering between the limiting member 13 and the elastic seal 3 and corroding the limiting member 13, thereby better protecting the limiting member 13; and, as Figure 5 As shown, when the strip slit 32 is in the open state, the outer wall of the elastic seal 3 will undergo elastic deformation in the direction of approaching the limiting member 13, making the outer wall of the elastic seal 3 and the limiting member 13 more tightly abut against each other, thereby better ensuring the limiting member 13's limiting and abutting effect on the elastic seal 3.
[0057] In this embodiment, as Figure 2 , Figure 5 and Figure 7As shown, the injection groove 31 is a blind hole extending along the Z-axis direction. That is, the top of the injection groove 31 is connected to the injection hole 11, and the bottom of the injection groove 31 is sealed to ensure the sealing performance of the injection groove 31. Furthermore, by setting the injection groove 31 with a blind hole structure, when the strip slit 32 is in a closed state, but the top of the elastic seal 3 becomes weak and loose and does not fit tightly against the bottom surface of the outer periphery of the injection hole 11, impurities that fall into the injection groove 31 between the top of the elastic seal 3 and the bottom surface of the outer periphery of the injection hole 11 will also be received by the injection groove 31 and will not easily enter the interior of the housing 20 through the bottom of the injection groove 31.
[0058] In another embodiment, such as Figure 3 As shown, the injection groove 31 can also be a through groove that passes through the elastic seal 3 along the Z-axis direction. The bottom of the injection groove 31 abuts against the inner bottom surface of the boss 21. That is, the bottom of the injection groove 31 abuts against the inner bottom surface of the receiving groove 212, so that the bottom of the injection groove 31 can be sealed by the inner bottom surface of the receiving groove 212, thus ensuring the sealing of the injection groove 31.
[0059] Furthermore, such as Figure 6 and Figure 7 As shown, a connecting groove is provided on one of the lower plastic 2 and the cover plate 1, and a connecting protrusion 22 is provided on the other. The connecting protrusion 22 is located on the outer periphery of the elastic seal 3 and can be engaged in the connecting groove. This allows the cover plate 1 and the lower plastic 2 to be positioned, thereby facilitating accurate sealing between the elastic seal 3 and the cover plate 1, and thus ensuring a better temporary seal of the elastic seal 3 on the injection hole 11. Furthermore, it makes the connection between the cover plate 1 and the lower plastic 2 more compact and stable. In this embodiment, a connecting protrusion 22 is provided on the side of the lower plastic 2 facing the cover plate 1, and a corresponding connecting groove is provided on the cover plate 1.
[0060] Specifically, such as Figure 6 and Figure 7 As shown, multiple connecting protrusions 22 are provided on the side of the lower plastic 2 facing the cover plate 1. These protrusions 22 are arranged in a ring, and multiple connecting grooves are correspondingly provided on the cover plate 1. Each connecting protrusion 22 is inserted into one connecting groove to better ensure the positioning effect and connection stability between the cover plate 1 and the lower plastic 2. In this embodiment, four connecting protrusions 22 and four connecting grooves are provided. The specific number of connecting protrusions 22 and connecting grooves is not limited here.
[0061] The specific working process of the cover plate assembly 10 in this embodiment is as follows:
[0062] When fluid injection is required:
[0063] First, the injection needle is passed downward along the Z-axis through the injection hole 11 and pressed against the top of the elastic seal 3. The injection needle is pressed downward along the Z-axis against the elastic seal 3, causing the elastic seal 3 to undergo elastic deformation. At this time, the gaps of each strip slit 32 on the elastic seal 3 gradually increase, and the top of the elastic seal 3 no longer abuts against the bottom surface of the outer periphery of the injection hole 11. The strip slit 32 connects the injection groove 31 and the through hole 211. Then, the electrolyte in the injection needle flows into the interior of the housing 20 through the injection hole 11, the injection groove 31, the strip slit 32 and the through hole 211 in sequence, so as to realize the injection of electrolyte into the interior of the housing 20.
[0064] When it is necessary to temporarily seal the injection hole 11:
[0065] First, withdraw the injection needle to eliminate the pressure of the injection needle on the top of the elastic seal 3. At this time, the elastic seal 3 can automatically recover its elastic deformation upward along the Z-axis. During the recovery of elastic deformation, the strip slit 32 also recovers its elasticity simultaneously until the strip slit 32 is in a closed state. At this time, the top of the elastic seal 3 abuts against the bottom surface of the outer periphery of the injection hole 11 again, so that the strip slit 32 separates the injection groove 31 from the through hole 211, thereby achieving a temporary seal on the injection hole 11.
[0066] When it is necessary to weld and seal the injection hole 11 for a long period of time:
[0067] First, it is not necessary to remove the elastic seal 3 from the boss 21. At this time, the strip 32 of the elastic seal 3 is in a closed state. Place the elastic sealing nail on the step surface 12 of the cover plate 1 and weld the elastic sealing nail to the step surface 12 so as to achieve long-term welding seal of the injection hole 11 through the elastic sealing nail.
[0068] In this embodiment, the cover plate assembly 10, through the pressure of the liquid injection against the elastic seal 3, can open the strip slit 32 through the elastic deformation of the elastic seal 3 while injecting liquid, so as to quickly and easily open the injection hole 11; and, the injection hole 11 can be quickly sealed by the elastic deformation recovery of the elastic seal 3 itself. The operation is simple and the work reliability is high.
[0069] In this embodiment, the cover plate assembly 10 is equipped with a limiting member 13 with a preset height, and a gap is made between the outer wall of the elastic seal 3 and the inner wall of the receiving groove 212, so as to ensure that the elastic seal 3 can undergo stable and smooth elastic deformation in the receiving groove 212, thereby ensuring stable switching between the functions of liquid injection and sealing of the injection hole 11.
[0070] In this embodiment, the cover plate assembly 10 can directly weld the elastic sealing nail onto the stepped surface 12 of the cover plate 1 without removing the elastic sealing element 3 from the protrusion 21 after the liquid injection, settling, secondary liquid injection and cleaning process. The operation is simple and convenient, and it can ensure that impurities during the welding sealing process will not fall into the housing 20.
[0071] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A cover assembly, disposed over the opening of the housing (20), characterized in that, include: Cover plate (1), wherein the cover plate (1) is provided with a liquid injection hole (11); The lower plastic (2) is located on the side of the cover plate (1) facing the inside of the housing (20). The side of the lower plastic (2) facing the inside of the housing (20) is provided with a protrusion (21). A through hole (211) is provided through the seat wall of the protrusion (21). The through hole (211) communicates with the inside of the housing (20). An elastic seal (3) is disposed inside the boss (21). The top end of the elastic seal (3) abuts against the bottom surface of the outer periphery of the injection hole (11), and the bottom end of the elastic seal (3) abuts against the inner bottom surface of the boss (21). The elastic seal (3) can undergo elastic deformation to connect or disconnect the injection hole (11) from the through hole (211).
2. The cover plate assembly as claimed in claim 1, characterized in that, The elastic seal (3) is provided with an injection groove (31) corresponding to and communicating with the injection hole (11). The groove wall of the injection groove (31) is provided with a strip slit (32) extending along the Z-axis direction. The Z-axis direction is parallel to the thickness direction of the cover plate (1). The strip slit (32) penetrates the side wall of the injection groove (31). The strip-shaped slit (32) has a closed state and an open state. When the elastic seal (3) elastically deforms along the Z-axis, the strip-shaped slit (32) is in the open state, and when the elastic seal (3) returns to its original state, the strip-shaped slit (32) is in the closed state.
3. The cover plate assembly as claimed in claim 2, characterized in that, Both the through holes (211) and the strip slots (32) are provided in multiples. Each through hole (211) is evenly arranged along the circumference of the protrusion (21), and one through hole (211) corresponds to one strip slot (32).
4. The cover plate assembly as claimed in claim 2, characterized in that, Along the Z-axis direction, the projection of the injection groove (31) is located inside the injection hole (11) so that it can pass through the injection hole (11) and press against the top of the elastic seal (3) so that the elastic seal (3) can be elastically deformed.
5. The cover plate assembly as described in any one of claims 2-4, characterized in that, The protrusion (21) is provided with a receiving groove (212) communicating with the through hole (211), the elastic seal (3) is placed in the receiving groove (212), and there is a gap between the outer wall of the elastic seal (3) and the inner wall of the receiving groove (212).
6. The cover plate assembly as claimed in claim 5, characterized in that, The cover plate (1) is connected to a limiting member (13) on the side facing the inside of the housing (20). The limiting member (13) is located on the outer periphery of the injection hole (11). The limiting member (13) is used to abut against the outer wall of the elastic seal (3) to limit the elastic seal (3) into the receiving groove (212).
7. The cover plate assembly as described in any one of claims 2-4, characterized in that, The injection groove (31) is a blind hole extending along the Z-axis direction.
8. The cover plate assembly as described in any one of claims 2-4, characterized in that, The injection groove (31) is a through groove that passes through the elastic seal (3) along the Z-axis direction, and the bottom of the injection groove (31) abuts against the inner bottom surface of the boss (21).
9. The cover plate assembly as described in any one of claims 1-4, characterized in that, One of the lower plastic (2) and the cover plate (1) is provided with a connecting groove, and the other is provided with a connecting protrusion (22). The connecting protrusion (22) is located on the outer periphery of the elastic seal (3), and the connecting protrusion (22) can be engaged in the connecting groove.
10. A single battery cell, characterized in that, It includes a battery cell (30), a housing (20), and a cover assembly as described in any one of claims 1-9, the cover assembly being used to encapsulate the battery cell (30) inside the housing (20).