Battery cell cover plate assembly and battery cell

Abstract

This utility model relates to the field of power battery technology and provides a cell cover assembly and a cell. The cell cover assembly includes a cover body with a terminal through-hole and a terminal. One side of the cover body has an insulating portion circumferentially formed around the terminal through-hole, which insulates the terminal and the cover body. In a cross-section orthogonal to the length of the cover body, the terminal is convex ("U") in shape and has a first output terminal face and second output terminal faces located on both sides of the first output terminal face. The first output terminal face is used for electrical connection by a first electrical connector, and the second output terminal face is used for electrical connection by a second electrical connector. The second output terminal face protrudes away from the cover body relative to the insulating portion. The cell cover assembly of this utility model, utilizing the convex ("U") structural design of the terminal, facilitates the cascade utilization of the cell. Furthermore, when cascade utilization of the cell is not considered, using two electrical connectors in parallel can improve the current carrying capacity.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a cell cover assembly. It also relates to a battery cell equipped with the aforementioned cell cover assembly. Background Technology

[0002] Electrolyte, a crucial component of lithium batteries, plays a vital role in conducting electrons between the positive and negative electrodes, ensuring the high voltage and high specific energy of lithium-ion batteries. During charge-discharge cycles, the electrolyte continuously reacts with the electrodes, being consumed and decomposed. As the amount of electrolyte decreases, the battery's internal electronic conductivity declines, leading to a decrease in electrical performance and consequently, a reduction in battery lifespan.

[0003] Existing lithium batteries or cells typically have terminals (including positive and negative terminals) for current output. When multiple cells are used in a group, adjacent cells are connected in series or parallel via electrical connectors. However, in actual use, if the connectors are damaged due to external forces or long-term aging, making it impossible to re-weld them onto the terminals, this not only increases the difficulty of cell repair or reassembly but also hinders the reuse of cells. This results in cells that could have continued to be used being prematurely scrapped due to connection problems, leading to resource waste. Utility Model Content

[0004] In view of this, the present invention aims to provide a cell cover assembly to facilitate the cascade utilization of the cell.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A battery cell cover assembly includes a cover body having a terminal through hole, and a terminal disposed in the terminal through hole;

[0007] One side of the cover plate body is provided with an insulating part formed around the perimeter of the pole post through hole. The insulating part partially blocks the perimeter of the pole post and can insulate the pole post and the cover plate body.

[0008] On a cross section orthogonal to the length direction of the cover plate body, the pole post is convex and has a first output end face at the top and second output end faces on both sides of the first output end face. The first output end face is used for electrical connection of the first electrical connection piece, and the second output end face is used for electrical connection of the second electrical connection piece. The second output end face protrudes from the insulating part to the side away from the cover plate body.

[0009] Furthermore, in the projection onto the cover plate body, the pole post is rectangular, and the long side of the pole post is arranged along the length direction of the cover plate body.

[0010] Furthermore, the electrode post includes a positive electrode post and a negative electrode post arranged at intervals along the length direction of the cover plate body; the explosion-proof valve in the battery cell is disposed on the cover plate body and located between the positive electrode post and the negative electrode post, the explosion-proof valve is elongated and extends along the width direction of the cover plate body.

[0011] Furthermore, the cover plate body is provided with a removable protrusion, which is correspondingly provided with an injection hole on the cover plate body, and the protrusion is provided with a sealing hole communicating with the injection hole. The sealing hole is provided with a first sealing part for installing a first sealing element, and the injection hole is provided with a second sealing part for installing a second sealing element. The sealing hole can be sealed by the first sealing element, and after the protrusion is removed from the cover plate body, the injection hole can be sealed by the second sealing element.

[0012] Furthermore, the protrusion has a first column connected to the cover plate body and a second column connected to the first column; the sealing hole extends through both the first column and the second column, and the cross-sectional area of ​​the first column is larger than the cross-sectional area of ​​the second column.

[0013] Furthermore, the sealing hole includes a first through hole on the first column and a second through hole on the second column, the first through hole and the second through hole being connected, and the diameter of the first through hole being smaller than the diameter of the second through hole; the first sealing part includes a first stepped surface connecting the first through hole and the second through hole; and / or, the first sealing part includes the end face of the second column away from the first column.

[0014] Furthermore, the sealing hole is a through hole penetrating the first column and the second column, and the diameter of the through hole is the same. The end of the protrusion away from the cover plate body constitutes the first sealing part.

[0015] Furthermore, the injection hole is a stepped hole and has a third through hole and a fourth through hole that are connected along the injection direction. The diameter of the third through hole is larger than the diameter of the fourth through hole. The second sealing part includes a second stepped surface that connects the third through hole and the fourth through hole.

[0016] Furthermore, the injection hole is located at one end near the cover plate body.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] (1) The cell cover assembly of this utility model, by providing a circumferential insulating part around the electrode through hole on one side of the cover body, can partially block the circumference of the electrode, thus insulating the electrode and the cover body and improving the safety of use. The electrode is convex and has a first output end face and a second output end face located on both sides of the first output end face. The first and second output end faces are respectively used for connecting the first and second electrical connecting pieces. In this way, when the cells are grouped, two adjacent cells can be electrically connected to the corresponding second output end faces of the two cells through the second electrical connecting pieces to realize the series or parallel connection of the two adjacent cells. When using them in a cascade manner, the second electrical connecting piece only needs to be cut in the middle without complicated processing, and the first electrical connecting piece can be electrically connected to the first output end faces of the two adjacent cells. The convex structure design of the electrode is conducive to realizing the cascade utilization of the cells.

[0019] Moreover, when the battery cells are not considered for reuse, the first and second electrical connection pieces are welded between the corresponding terminals of two adjacent battery cells and used in parallel. Compared with using a thicker electrical connection piece of the same cross-sectional area, this method has a stronger current carrying capacity, better expansion absorption effect, and can meet the needs of high-end battery pack products for high-rate charging and discharging.

[0020] (2) Setting the pole as a long strip structure extending along the length of the cover plate body is beneficial to increasing the contact area between the pole and the first electrical connection piece or between the pole and the second electrical connection piece, improving the current carrying capacity, and ensuring the reliability of the electrical connection between the pole and the first electrical connection piece, as well as the reliability of the electrical connection between the pole and the second electrical connection piece.

[0021] (3) By placing the explosion-proof valve in the cell between the positive and negative terminals, the internal pressure of the cell can be released more evenly, avoiding damage to the internal structure of the battery due to uneven pressure release, and preventing problems such as cell deformation and leakage. At the same time, the long strip-shaped explosion-proof valve extends along the width of the cover plate body, which can leave more space for the positive and negative terminals in the length direction of the cover plate body.

[0022] (4) By providing a removable protrusion on the cover plate body, and a sealing hole connected to the injection hole on the protrusion, during electrolyte filling, the electrolyte flows sequentially through the sealing hole and the injection hole, and enters the cell housing. After electrolyte filling is completed, the sealing hole is sealed by the first sealing element installed on the first sealing part. When the cell needs to be replenished, the protrusion is removed from the cover plate body. At this time, the electrolyte is added into the cell housing through the injection hole. After replenishment is completed, the injection hole is sealed by the second sealing element installed on the second sealing part. This design not only facilitates electrolyte filling and replenishment, but also ensures the sealing effect of the injection hole after filling and replenishment, and also facilitates the reuse of the cell.

[0023] (5) The protrusion adopts the structure of a first column and a second column connected together, and the sealing hole passes through the first column and the second column together, and the cross-sectional area of ​​the first column is smaller than that of the second column. This structure facilitates the preparation and molding of the protrusion, and the protrusion is also easy to remove from the cover plate body through the first column with a smaller cross-sectional area.

[0024] (6) The sealing hole adopts a first through hole and a second through hole that are connected, and the diameter of the first through hole is smaller than that of the second through hole. On the one hand, the stepped hole structure is conducive to improving the electrolyte filling effect, and on the other hand, it is also convenient to form the first step surface, which can provide an installation positioning base for the first seal and ensure the sealing effect of the injection hole. At the same time, the end face of the second column away from the first body can be used as the installation base of the first seal, which can also ensure the sealing effect of the injection hole.

[0025] (7) The sealing hole can also be a through hole that penetrates the first column and the second body. The diameter of the through hole is the same. At this time, the end face of the protrusion away from the cover plate body serves as the first sealing part, which is used to provide the installation base for the first sealing element. This can also ensure the sealing effect of the injection hole.

[0026] (8) The injection hole adopts a stepped hole and has a third through hole and a fourth through hole that are connected along the injection direction, so that the diameter of the third through hole is larger than the diameter of the fourth through hole, which is conducive to improving the smoothness of electrolyte injection. The second sealing part includes a second step surface connecting the third through hole and the fourth through hole. The second step surface here can provide an installation positioning base for the second seal and ensure the sealing effect of the injection hole.

[0027] (9) The injection hole is located at one end of the cover plate body, which facilitates the removal of the protrusion from the cover plate body. At the same time, after the electrolyte is replenished, it is convenient for the second sealing element to seal the injection hole.

[0028] Another objective of this utility model is to provide a battery cell having a battery cell cover assembly as described above.

[0029] The battery cell of this invention, by employing the aforementioned cell cover plate, allows for the electrical connection between adjacent cells during cell assembly. Two adjacent cells are first electrically connected to their corresponding second output terminal surfaces via a second connecting piece, enabling series or parallel connection. For secondary use, the second connecting piece is simply cut in the middle without complex processing, allowing for the electrical connection between the first connecting piece and the first output terminal surfaces of the two adjacent cells. This "convex" shaped structure of the terminal post facilitates secondary use of the cells. Furthermore, when secondary use is not considered, the first and second electrical connecting pieces are welded together between the corresponding terminals of two adjacent cells and used in parallel. Compared to a single, thicker electrical connecting piece of the same cross-sectional area, this provides stronger current carrying capacity, better expansion absorption, and meets the high-rate charge / discharge requirements of high-end battery pack products. Attached Figure Description

[0030] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0031] Figure 1 This is a perspective view of the application state of the battery cell cover assembly described in this embodiment of the present utility model;

[0032] Figure 2 This is a top view of the battery cell cover assembly in the application state according to an embodiment of the present utility model;

[0033] Figure 3 This is a partial enlarged view of the application state of the battery cell cover assembly described in this embodiment of the utility model;

[0034] Figure 4 This is a top view of the battery cell cover plate described in an embodiment of the present utility model;

[0035] Figure 5 for Figure 4 Sectional view from the AA direction;

[0036] Figure 6 This is a structural diagram showing the mating state of the first sealing element and the cover plate body according to an embodiment of the present utility model;

[0037] Figure 7 This is a structural diagram showing the mating state of the second sealing element and the cover plate body according to an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the first structural state of multiple battery cells assembled according to an embodiment of the present invention;

[0039] Figure 9This is a schematic diagram of a second structural configuration of multiple battery cells assembled according to an embodiment of the present invention;

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Cover plate body; 2. Housing; 3. Positive terminal; 4. Negative terminal; 5. Explosion-proof valve; 6. First electrical connection piece; 7. Second electrical connection piece;

[0042] 11. Protrusion; 12. First seal; 13. Second seal; 14. Insulation part;

[0043] 101. Injection hole; 102. Through hole for pole; 103. Explosion-proof valve mounting hole; 111. First column; 112. Second column; 1011. Third through hole; 1012. Fourth through hole; 1111. First through hole; 1121. Second through hole; 31. First output end face; 32. Second output end face;

[0044] 10. First step surface; 20. Second step surface. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0046] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0047] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0049] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] Example 1

[0051] This embodiment relates to a battery cell cover plate, which, through structural optimization, facilitates the cascade utilization of battery cells.

[0052] In terms of overall structure, the cell cover plate in this embodiment, as follows: Figures 1 to 4 As shown, the battery cell cover plate of this embodiment includes a cover plate body 1 with a terminal through hole 102, and a terminal provided in the terminal through hole 102.

[0053] The cover plate body 1 has an insulating portion 14 circumferentially formed around the electrode through hole 102 on one side. The insulating portion 14 partially blocks the circumference of the electrode, insulating the electrode and the cover plate body 1. Furthermore, in a cross-section orthogonal to the length of the cover plate body 1, the electrode is convex, having a first output terminal surface 31 at the top and second output terminal surfaces 32 on either side of the first output terminal surface 31. The first output terminal surface 31 is used for electrical connection of the first electrical connector 6, and the second output terminal surface 32 is used for electrical connection of the second electrical connector 7. The second output terminal surface 32 protrudes away from the cover plate body 1 relative to the insulating portion 14.

[0054] In this structure, the insulating part 14 partially shields the circumference of the electrode post, thus insulating the electrode post and the cover plate body 1 and improving safety. The electrode post is convex in shape and has a first output terminal surface 31 and two second output terminal surfaces 32. The first output terminal surface 31 and the second output terminal surface 32 are respectively used for connecting the first electrical connecting piece 6 and the second electrical connecting piece 7. In this way, when the cells are grouped, two adjacent cells can be electrically connected to the corresponding second output terminal surfaces 32 of the two cells through the second electrical connecting piece 7 to realize the series or parallel connection of the two adjacent cells. When using the cells in a cascade manner, the second electrical connecting piece 7 can be cut in the middle without complicated processing, and the first electrical connecting piece 6 can be electrically connected to the first output terminal surfaces 31 of the two adjacent cells. Thus, the convex shape of the electrode post structure is conducive to realizing the cascade utilization of the cells.

[0055] Moreover, when the battery cells are not considered for reuse, the first electrical connection piece 6 and the second electrical connection piece 7 are welded between the corresponding terminals of two adjacent battery cells and used in parallel. Compared with a thicker electrical connection piece of the same cross-sectional area, this has a stronger current carrying capacity, better expansion absorption effect, and can meet the needs of high-end battery pack products for high-rate charging and discharging.

[0056] Based on the overall structure above, for details, please refer to... Figures 1 to 4 As shown, in a specific implementation, the insulating part 14 is preferably integrally formed on the cover plate body 1. The insulating part 14 has an annular thin-walled structure, which can partially block the circumference of the pole passing through the pole through hole 102.

[0057] When multiple battery cells need to be used in groups, such as Figure 8 As shown, adjacent cells are first electrically connected to their corresponding second output terminal faces 32 via a second electrical connecting piece 7, thus achieving series or parallel connection between the two cells. For later reuse, simply cut the second connecting piece in the middle; no complex processing is required. Then, as shown... Figure 9 As shown, the first electrical connection piece 6 is electrically connected to the first output terminal face 31 on the two adjacent cells, thereby realizing the series or parallel connection of the two adjacent cells.

[0058] When the secondary use of the battery cells is not considered, two adjacent battery cells are electrically connected to their corresponding second output terminal surfaces 32 via a second electrical connection piece 7, and also electrically connected to their corresponding first output terminal surfaces 31 via a first electrical connection piece 6. The first electrical connection piece 6 and the second electrical connection piece 7 are used in parallel. That is, each "convex"-shaped terminal of two adjacent battery cells is connected to the first electrical connection piece 6 and the second electrical connection piece 7. In this way, using the first electrical connection piece 6 and the second electrical connection piece 7 in parallel provides a stronger current carrying capacity and better expansion absorption effect compared to using a single, thicker electrical connection piece of the same cross-sectional area, and can meet the high-rate charge and discharge requirements of high-end battery pack products.

[0059] Based on the "convex" shaped cross-section of the electrode post, in this preferred embodiment, the projection of the electrode post onto the cover plate body 1 is rectangular, and the long side of the electrode post is arranged along the length direction of the cover plate body 1. This arrangement helps to increase the contact area between the electrode post and the first electrical connection piece 6 or between the electrode post and the second electrical connection piece 7, and can ensure the reliability of the electrical connection between the electrode post and the first electrical connection piece 6, as well as the reliability of the electrical connection between the electrode post and the second electrical connection piece 7.

[0060] Reference Figure 3As shown, the second output terminal surface 32 on the pole protrudes away from the cover plate body 1 relative to the insulating part 14. That is, the distance H1 between the second output terminal surface 32 on the pole and the upper surface of the cover plate body 1 is greater than the height H of the insulating part 14. This arrangement can prevent the second electrical connection piece 7 from being pushed up by the insulating part 14 when it is placed on the second output terminal surface 32, thus affecting the reliability of the electrical connection between the second electrical connection piece 7 and the second output terminal surface 32.

[0061] In addition, in this embodiment, the distance L between the first output end face 31 and the second output end face 32 should be greater than the total thickness of the second electrical connector 7 and the weld bead. In this way, when the first electrical connector 6 is welded to the first output end face 31 during secondary use, the residue of the first connector will not affect the welding of the second electrical connector 7.

[0062] It is worth noting that both the first electrical connection piece 6 and the second electrical connection piece 7 can be made of aluminum alloy, a material commonly used in the prior art. It is also worth noting that an expansion arch is formed in the middle of both the first electrical connection piece 6 and the second electrical connection piece 7, which prevents excessive stress on the terminals from causing leakage or damage when the battery cell expands. Furthermore, it is worth noting that the terminals on the cover plate can be only the positive terminal 3, only the negative terminal 4, or a combination of alternating positive and negative terminals 3 and 4.

[0063] As a preferred embodiment, in this example, the terminals include positive terminals 3 and negative terminals 4 spaced apart along the length of the cover plate body 1. Both the positive terminals 3 and 4 are elongated, and both have a "convex" shape in their cross-sections orthogonal to the length of the cover plate body. Furthermore, the explosion-proof valve 5 in the battery cell is specifically installed in the explosion-proof valve mounting hole 103 on the cover plate body 1, located between the positive terminals 3 and 4. The explosion-proof valve 5 is elongated and extends along the width of the cover plate body 1.

[0064] At this point, placing the explosion-proof valve 5 in the middle of the positive terminal 3 and the negative terminal 4 in the battery cell can release the internal pressure of the battery cell more evenly, avoiding damage to the internal structure of the battery due to uneven pressure release, and preventing problems such as deformation and leakage of the battery cell. At the same time, setting the long strip-shaped explosion-proof valve 5 to extend along the width direction of the cover plate body 1 can leave more space for the positive terminal 3 and the negative terminal 4 in the length direction of the cover plate body 1.

[0065] It should be noted that in this embodiment, the second electrical connector 7 can select either the second output end face 32 on one side or the second output end face 32 on the other side to weld adjacent battery cells according to the actual needs of the stacked battery cells. At this time, the size of the second electrical connector 7 in the battery cell thickness direction is shorter than that of the first electrical connector 6, and the weight and total internal resistance of the second electrical connector 7 in the entire battery pack are also the lowest.

[0066] When performing cascade utilization, only need to cut the second electrical connection piece 7 in the middle, and then weld the first electrical connection piece 6 on the first output end face 31 at the top of the pole column. Moreover, since the first electrical connection piece 6 is arranged at the top of the pole column, the requirement for tolerance fit is relatively low. During cascade utilization, usually the precision of the equipment and tooling is not as high as that during the first assembly. Therefore, it is beneficial to the fixation and welding of the aluminum bar during cascade utilization and reduces the process difficulty.

[0067] In addition, in the prior art, since lithium batteries or battery cells are usually designed with a fully sealed structure, after the lithium batteries or battery cells are manufactured, it is usually impossible to add electrolyte later. When the problem of electrolyte dryness occurs in the later stage of the cycle, the cycle life of the lithium battery or battery cell is reduced or terminated, resulting in the problem that the lithium battery or battery cell cannot be used or cascaded.

[0068] For this reason, in this embodiment, on the basis of setting a "convex" - shaped pole column, as a preferred embodiment, Figure 1 、 Figure 2 and in combination with Figures 4 to 7 as shown, the cover plate body 1 is also provided with a convex portion 11 that can be removed. The convex portion 11 is correspondingly arranged with the liquid injection hole 101 on the cover plate body. And a sealing hole communicating with the liquid injection hole 101 is provided on the convex portion 11. A first sealing portion for installing the first sealing member 12 is provided at the sealing hole, and a second sealing portion for installing the second sealing member is provided at the liquid injection hole 101. The sealing hole can be sealed by the first sealing member 12, and after the convex portion 11 is removed from the cover plate body 1, the liquid injection hole 101 can be sealed by the second sealing member 13.

[0069] Thus, by providing the convex portion 11 that can be removed on the cover plate body 1 and providing a sealing hole communicating with the liquid injection hole 101 on the convex portion 11, when adding electrolyte, the electrolyte flows through the sealing hole and the liquid injection hole 101 in sequence and enters the battery cell housing. After the electrolyte addition is completed, the liquid injection hole 101 is sealed by the first sealing member 12 installed on the first sealing portion. When the battery cell needs to be refilled with liquid, by removing the convex portion 11 from the cover plate body 1, at this time, the electrolyte is added to the battery cell housing through the liquid injection hole 101. After the refilling is completed, the liquid injection hole 101 is sealed by the second sealing member 13 installed on the second sealing portion.

[0070] At the same time, through the above - mentioned structural design, it is not only beneficial to the injection and refilling of the electrolyte, but also can ensure the sealing effect after the liquid injection hole 101 is injected with liquid and refilled, and is beneficial to the cascade utilization of the battery cell. Moreover, the convex portion 11 has a lightweight design.

[0071] Specifically, referring to Figures 4 to 7As shown, in this embodiment, as a preferred implementation, the protrusion 11 and the sealing hole on the protrusion 11 can be integrally formed on the cover plate body 1, or they can be separately processed and then fixed to the cover plate body 1 by welding or bonding. In this embodiment, preferably, the protrusion 11 and the cover plate body 1 are integrally formed. Furthermore, during secondary electrolyte replenishment, it is preferable to cut and remove the protrusion 11 from the position where it connects to the cover plate body 1. After the protrusion 11 is removed, electrolyte is replenished through the injection hole 101 on the cover plate.

[0072] In this embodiment, the first sealing element 12 and the second sealing element 13 are preferably aluminum sheets. The first sealing element 12 is welded to the first sealing part, and the second sealing element 13 is welded to the second sealing part. It is also worth noting that before welding the first sealing element 12 or the second sealing element 13, rubber plugs need to be inserted into the injection hole 101 and the sealing hole to further ensure the sealing effect at the injection hole 101.

[0073] Reference Figure 5 and Figure 6 As shown in the illustration, in this embodiment, as a preferred implementation, the protrusion 11 has a first column 111 connected to the cover plate body 1, and a second column 112 connected to the first column 111. The aforementioned sealing hole extends through both the first column 111 and the second column 112, and the cross-sectional area of ​​the first column 111 is larger than the cross-sectional area of ​​the second column 112. Here, the protrusion 11 adopts a structure with connected first column 111 and second column 112, which facilitates the fabrication and molding of the protrusion 11. At the same time, by using the first column 111 with a smaller cross-sectional area to connect with the cover plate body 1, the connection area between the protrusion 11 and the cover plate body 1 is small, which facilitates the removal of the protrusion 11 from the cover plate body 1 through cutting.

[0074] It is worth noting that the cross-section of the first column 111 can be circular, triangular, rectangular or other polygonal, and the cross-section of the second column 112 can also be circular, triangular, rectangular or other polygonal. Preferably, the cross-sections of the first column 111 and the second column 112 are both circular. This structural form is more conducive to manufacturing and molding compared to other structural forms.

[0075] In this embodiment, as one possible implementation method, refer to Figure 5 and Figure 6As shown, the sealing hole includes a first through hole 1111 on the first column 111 and a second through hole 1121 on the second column 112. The first through hole 1111 and the second through hole 1121 are connected, and the diameter of the first through hole 1111 is smaller than the diameter of the second through hole 1121. The aforementioned first sealing part includes a first stepped surface 10 connecting the first through hole 1111 and the second through hole 1121. It can be understood that, in addition to including the first stepped surface 10, the first sealing part may also include the end face of the second column 112 away from the first column 111, that is, the top of the second column 112 may also serve as the first sealing part.

[0076] In the above structure, the sealing hole uses a connected first through hole 1111 and a second through hole 1121, with the diameter of the first through hole 1111 being smaller than that of the second through hole 1121. This stepped hole structure improves the electrolyte filling effect and facilitates the formation of the first stepped surface 10, providing a mounting base for the first seal 12 and ensuring the sealing effect of the injection hole 101. Simultaneously, the end face of the second column 112 furthest from the first body can also be used as the mounting base for the first seal 12, thus ensuring the sealing effect of the injection hole 101.

[0077] In specific implementation, the first sealing element 12 can be welded to the first stepped surface 10, or it can be welded to the top surface of the second column 112. Alternatively, the first sealing element 12 can be welded to both the first stepped surface 10 and the top surface of the second main body. Preferably, in this embodiment, the first sealing element 12 is welded to the first stepped surface 10.

[0078] It is worth noting that the depth of the second through hole 1121 formed on the second column 112 is slightly greater than the thickness of the first seal 12. For example, the depth of the second through hole 1121 does not exceed twice the thickness of the first seal 12. This ensures the reliability of the welding between the first seal 12 and the second column 112 while making the structure more compact.

[0079] As another feasible implementation, the sealing hole can also be a through hole penetrating the first column 111 and the second column 112, with the same diameter. The end of the protrusion 11 away from the cover plate body 1 constitutes the first sealing part, that is, the end face of the top of the protrusion 11 constitutes the first sealing part. In this case, the top end face of the protrusion 11 serves as the first sealing part, providing an installation base for the first sealing element 12. In specific implementation, the first sealing element 12 is welded to the top end face of the protrusion 11, which also ensures the sealing effect of the injection hole 101.

[0080] See Figures 5 to 7As shown, in this embodiment, the injection hole 101 is a stepped hole, and has a third through hole 1011 and a fourth through hole 1012 that are connected along the injection direction. The diameter of the third through hole 1011 is larger than the diameter of the fourth through hole 1012. The second sealing part includes a second stepped surface 20 connecting the third through hole 1011 and the fourth through hole 1012. The structure of the injection hole 101 is beneficial to improving the smoothness of electrolyte injection. The second sealing part, with the second stepped surface 20 connecting the third through hole 1011 and the fourth through hole 1012, can provide an installation and positioning base for the second sealing element 13, ensuring the sealing effect of the injection hole 101.

[0081] In specific implementation, the third through hole 1011 is preferably a tapered hole, which can better improve the smoothness of electrolyte injection. Moreover, after the protrusion 11 is removed and the electrolyte is replenished, it is welded to the second step surface 20 through the second sealing member 13, which can also ensure the sealing effect of the injection hole 101.

[0082] It is worth noting that the diameters of the second through hole 1121, the first through hole 1111, the third through hole 1011, and the fourth through hole 1012 are set to gradually decrease in size. This facilitates the processing and preparation of the sealing hole and the injection hole 101, and also facilitates the electrolyte filling operation.

[0083] In a preferred embodiment, the injection hole 101 is located near one end of the cover plate body 1. This facilitates the removal of the protrusion 11 from the cover plate body 1, and also makes it easier for the second sealing member 13 to seal the injection hole 101 after the electrolyte replenishment is completed.

[0084] In this embodiment, the battery cell cover assembly has a protrusion 11 on the cover body 1 and a sealing hole that connects to the injection hole 101 on the protrusion 11. This allows for the injection of electrolyte, and the replenishment of electrolyte can be achieved by removing the protrusion 11 from the cover body 1. At the same time, the sealing effect of the injection hole 101 after injection and replenishment can be guaranteed, which is also beneficial for the secondary use of the battery cell.

[0085] Example 2

[0086] This embodiment relates to a battery cell, which includes a battery cell cover assembly as described in Embodiment 1. Regarding the specific structure, see [link to previous section]. Figure 1 and Figure 2 As shown, the battery cell in this embodiment includes a housing 2, and the housing 2 contains a bare battery cell and electrolyte. The battery cell cover plate of Embodiment 1 is welded to the opening of the housing 2.

[0087] This embodiment adopts the cell cover plate of Embodiment 1, and through the "convex" structure design of the pole post, it is conducive to the cascade utilization of the cell, and no complicated processing is required. Simply cut the second electrical connection piece 7 in the middle, and the first electrical connection piece 6 can be electrically connected to the first output terminal face 31 on the two adjacent cells without complicated processing.

[0088] Furthermore, when the secondary use of the battery cells is not considered, the corresponding terminals of two adjacent battery cells are connected in parallel using a first electrical connection piece 6 and a second electrical connection piece 7. Compared to using a single, thicker electrical connection piece of the same cross-sectional area, this method has a stronger current-carrying capacity, better expansion absorption, and can meet the high-rate charge and discharge requirements of high-end battery pack products. Simultaneously, the removable protrusions on the cover plate body 1 allow for electrolyte injection and replenishment, ensuring a tight seal after injection and replenishment of the injection hole 101. This further facilitates the secondary use of the battery cells and provides excellent performance.

[0089] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cell cover assembly, characterized in that: It includes a cover plate body with a pole through hole, and a pole disposed in the pole through hole; One side of the cover plate body is provided with an insulating part formed around the perimeter of the pole post through hole. The insulating part partially blocks the perimeter of the pole post and can insulate the pole post and the cover plate body. On a cross section orthogonal to the length direction of the cover plate body, the pole post is convex and has a first output end face at the top and a second output end face on both sides of the first output end face. The first output end face is used for electrical connection of the first electrical connection piece, and the second output end face is used for electrical connection of the second electrical connection piece. The second output end face protrudes from the insulating part to the side away from the cover plate body.

2. The cell cover assembly according to claim 1, characterized in that: The pole is rectangular in shape when projected onto the cover plate body, and the long side of the pole is arranged along the length direction of the cover plate body.

3. The cell cover assembly according to claim 1, characterized in that: The electrode posts include positive electrode posts and negative electrode posts arranged at intervals along the length direction of the cover plate body; The explosion-proof valve in the battery cell is located on the cover plate body and between the positive terminal and the negative terminal. The explosion-proof valve is elongated and extends along the width direction of the cover plate body.

4. The cell cover assembly according to any one of claims 1 to 3, characterized in that: The cover plate body is provided with a removable protrusion, the protrusion is corresponding to the liquid injection hole on the cover plate body, and the protrusion is provided with a sealing hole communicating with the liquid injection hole. The sealing hole is provided with a first sealing part for installing a first sealing element, and the liquid injection hole is provided with a second sealing part for installing a second sealing element. The sealing hole can be sealed by the first sealing element, and after the protrusion is removed from the cover plate body, the injection hole can be sealed by the second sealing element.

5. The cell cover assembly according to claim 4, characterized in that: The protrusion has a first column connected to the cover plate body and a second column connected to the first column; The sealing hole extends through both the first column and the second column, and the cross-sectional area of ​​the first column is smaller than that of the second column.

6. The cell cover assembly according to claim 5, characterized in that: The sealing hole includes a first through hole provided on the first column and a second through hole provided on the second column. The first through hole and the second through hole are connected, and the diameter of the first through hole is smaller than the diameter of the second through hole. The first sealing portion includes a first stepped surface connecting the first through hole and the second through hole; and / or, the first sealing portion includes the end face of the second column away from the first column.

7. The cell cover assembly according to claim 5, characterized in that: The sealing hole is a through hole that penetrates the first column and the second column, and the diameter of the through hole is the same. The end of the protrusion away from the cover plate body constitutes the first sealing part.

8. The cell cover assembly according to claim 4, characterized in that: The injection hole is a stepped hole and has a third through hole and a fourth through hole that are connected along the injection direction. The diameter of the third through hole is larger than the diameter of the fourth through hole. The second sealing part includes a second stepped surface that connects the third through hole and the fourth through hole.

9. The cell cover assembly according to claim 4, characterized in that: The injection hole is located at one end near the cover plate body.

10. A battery cell, characterized in that: The battery cell is provided with a battery cell cover assembly as described in any one of claims 1 to 9.

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