Pole, cover plate assembly and battery cell

Abstract

The application discloses a pole, a cover plate assembly and a battery cell, and relates to the technical field of batteries. The pole comprises a pole plate body and a pole main body. The pole main body is arranged on the pole plate body. A plurality of groove bodies are arranged on the outer side wall of the pole main body in the circumferential direction of the pole main body. The groove bodies extend to the side away from the pole plate body and penetrate through the pole main body. Through the arrangement of the groove bodies, the technical problem of high heat of the pole can be effectively solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode post, cover plate assembly and battery cell. Background Technology

[0002] As a key component connecting the battery cell to the external circuit, the terminal block is mainly used for conducting current. However, high-current discharge, short circuits, or parallel connection of multiple cells can lead to overcurrent. When the overcurrent capacity of the battery cell is higher than that of the terminal block, the terminal block becomes a bottleneck for overcurrent. Long-term heating of the terminal block area will accelerate the aging of structural components.

[0003] However, the relevant technologies have not provided an effective solution to the problem of excessive heat in the electrode posts, resulting in excessive heat generation. Utility Model Content

[0004] The main purpose of this application is to propose an electrode post, cover plate assembly, and battery cell, which aims to effectively solve the technical problem of high heat generation in the electrode post.

[0005] On the one hand, an electrode post is provided, which includes:

[0006] pole plate body;

[0007] The electrode body is disposed on the electrode plate;

[0008] The outer wall of the pole body is provided with a plurality of grooves arranged circumferentially along the pole body, and the grooves extend to the side away from the pole plate and penetrate the pole body.

[0009] In one embodiment, the pole body includes:

[0010] First subject;

[0011] The second body is connected in sequence and coaxially arranged with the first body and the second body connected to the pole plate. The second body is provided on the second body.

[0012] In one embodiment, the outer diameter of the second body is larger than the outer diameter of the first body.

[0013] In one embodiment, each of the grooves extends axially along the second body.

[0014] In one embodiment, the difference between the outer diameter of the second body and the groove depth of the groove is not less than the outer diameter of the first body.

[0015] In one embodiment, the cross-section of the groove is any one of quadrilateral, semicircular, semi-elliptical, or triangular.

[0016] On the other hand, a cover plate assembly is provided, the cover plate assembly comprising:

[0017] The cover plate body, wherein the cover plate body is provided with a first through hole; and

[0018] As described in the above embodiment, the electrode body is disposed through the first through hole.

[0019] In one embodiment, the cover plate assembly further includes a riveting block disposed on the cover plate body, the riveting block having a second through hole through which the pole body passes;

[0020] The rivet block has a ventilation groove on the side near the cover plate body, and the ventilation groove is connected to the groove body.

[0021] In one embodiment, each of the grooves extends axially along the pole body;

[0022] The groove is connected to the air inlet end of the ventilation groove; the air outlet end of the ventilation groove is located near the outer periphery of the riveting block.

[0023] In one embodiment, the ventilation groove includes a plurality of first grooves and a plurality of second grooves, wherein the first grooves extend along a first direction and the second grooves extend along a second direction, and the plurality of first grooves and the plurality of second grooves are interconnected.

[0024] In one embodiment, the cover plate assembly further includes a first insulating member disposed between the cover plate body and the riveting block, and surrounding the riveting block. The first insulating member has a third through hole through which the pole post passes.

[0025] The first insulating component and the riveting block have a gap that communicates with the vent groove.

[0026] In one embodiment, there are two pole posts and two riveting blocks, and the cover plate body is provided with two first through holes.

[0027] On the other hand, a battery cell is provided, which includes a housing, an inner core, and a cover plate assembly as described in the above embodiment;

[0028] The shell is provided with an opening;

[0029] The cover assembly is disposed at the opening of the housing;

[0030] The inner core is disposed within the receiving space formed by the housing and the cover plate assembly.

[0031] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects:

[0032] Multiple grooves are formed on the outer wall of the electrode body, arranged circumferentially around the electrode body. The grooves extend away from the electrode plate and penetrate the electrode body, which makes the temperature distribution on the surface of the electrode body more uniform, reduces local heat dissipation, and increases the heat dissipation area of ​​the electrode, so that heat can be transferred out quickly, effectively optimizing the heat dissipation effect and achieving efficient heat dissipation; effectively solving the problem of high electrode heat and reducing costs.

[0033] Optimizing heat dissipation also extends the lifespan of the electrode posts. When the electrode posts are located in the cover plate assembly and applied to the battery cell, they can also improve the current carrying capacity of the cover plate assembly, increase heat dissipation, and further optimize the current carrying capacity of the battery cell.

[0034] The overall improvement is minor, making it easy to mass-produce and industrialize. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of one embodiment of the pole of this application;

[0037] Figure 2 This is a structural schematic diagram from another perspective of an embodiment of the pole piece of this application;

[0038] Figure 3 for Figure 2 A schematic diagram of the AA direction;

[0039] Figure 4 This is a schematic diagram of the structure of one embodiment of the cover plate assembly of this application;

[0040] Figure 5 for Figure 4 A schematic diagram of the BB direction;

[0041] Figure 6 for Figure 5 A magnified view of point A;

[0042] Figure 7 This is a schematic diagram of the structure of one embodiment of the riveting block of this application;

[0043] Figure 8 for Figure 7 A schematic diagram of the CC direction;

[0044] Figure 9This is an exploded view of one embodiment of the cover plate assembly of this application;

[0045] Figure 10 This is a schematic diagram of the structure of one embodiment of the battery cell of this application.

[0046] Explanation of icon numbers:

[0047] 10. Cover plate assembly;

[0048] 100. Pole post; 110. Pole post plate; 120. Pole post body; 121. First body; 122. Second body; 130. Groove; 140. Sealing ring;

[0049] 200. Cover plate body; 210. First through hole;

[0050] 300, Riveting block; 310, Second through hole; 320, Vent groove; 321, First groove; 322, Second groove;

[0051] 510. First insulating component; 520. Second insulating component;

[0052] 20. Shell;

[0053] 30. Inner core; 31. Electrode.

[0054] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0056] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0057] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0058] As a key component connecting the battery cell to the external circuit, the terminal block is primarily used for current conduction. However, high-current discharge, short circuits, or parallel operation of multiple cells can lead to overcurrent. When the battery cell's overcurrent capacity exceeds that of the terminal block, the terminal block becomes a bottleneck. Even if the battery cell can provide a larger current, the overcurrent capacity is limited because the terminal block is restricted by heat generation. The terminal block area generates high heat, which can lead to structural aging if exposed to heat for extended periods. According to the thermal balance formula (internal heat of the system = heat generated - heat dissipation), related technologies aim to reduce heat generation by increasing the overcurrent area of ​​the terminal block, but this approach increases costs.

[0059] like Figure 1 , Figure 2 As shown, to effectively solve the problem of high heat in the electrode post, some embodiments of this application propose an electrode post 100. The electrode post 100 includes an electrode post plate 110 and an electrode post body 120. The electrode post body 120 is disposed on the electrode post plate 110, and a plurality of grooves 130 arranged circumferentially along the outer side wall of the electrode post body 120 are formed therein. The grooves 130 extend away from the electrode post plate 110 and penetrate through the electrode post body 120.

[0060] The electrode body 120 is fixed by the electrode plate 110, ensuring the accurate positioning of the electrode 100 within the battery cell and facilitating subsequent assembly and use. The electrode body 120 conducts current; one end is connected to the electrode plate 110, and the other end is connected to an external circuit. It can be used to power external electrical equipment or to charge external charging devices. The electrode 100 is incorporated into the cover assembly 10 of the battery cell. The battery cell also includes a housing 20 and an inner core 30 housed within the housing 20. The cover assembly 10 is positioned at the opening of the housing 20. The inner core 30 has tabs 31. The electrode plate 110 connects the tabs 31 and the electrode body 120, allowing current to flow smoothly from the tabs 31 to the electrode body 120 and then through the electrode body 120 to the external circuit, thus enabling the battery cell to charge and discharge.

[0061] The distances between the multiple grooves 130 can be the same or different, and the shapes, widths, depths, and other dimensions of the multiple grooves 130 can be the same or different. Each groove 130 can be configured as a recess, with the groove 130 recessed from the periphery of the pole post body 120 toward the center of the pole post body 120.

[0062] Compared to related technologies that increase the flow area and reduce heat transfer by increasing the area of ​​the electrode 100, the embodiments of this application increase the heat dissipation without significantly increasing the cost or affecting the flow, thereby reducing the heat in the electrode 100 area and optimizing the heat dissipation effect.

[0063] The embodiments of this application, by creating multiple grooves 130 arranged circumferentially on the outer wall of the electrode post body 120, with the grooves 130 extending away from the electrode post plate 110 and penetrating the electrode post body 120, can make the temperature distribution on the main surface of the electrode post 100 more uniform, reduce local heat dissipation, and increase the heat dissipation area of ​​the electrode post 100, enabling heat to be transferred away quickly, effectively optimizing the heat dissipation effect and achieving efficient heat dissipation; effectively solving the problem of high electrode post heat and reducing costs. Optimizing the heat dissipation effect also extends the service life of the electrode post 100. When the electrode post 100 is installed in the cover plate assembly 10 and applied to the battery cell, it can also improve the current carrying capacity of the cover plate, increase heat dissipation, and further optimize the current carrying capacity of the battery cell. The overall improvement is minor, easy to mass-produce, and facilitates industrialization.

[0064] In one embodiment, the pole body 120 can be configured as a column of equal diameter, a stepped structure, etc. When the pole body 120 is configured as a column of equal diameter, the groove 130 can be opened at any position on the outer wall of the pole body 120. When the pole body 120 is configured as a stepped structure, the part of the pole body 120 away from the pole plate 110 can be set to be mainly used for installing the rivet block 300 or directly connecting to the external circuit. The groove 130 can be opened in the part of the pole body 120 close to the pole plate 110 to avoid the groove 130 from affecting the installation of the rivet block 300 or affecting the connection between the pole 100 and the external circuit to a certain extent.

[0065] When the pole body 120 is configured as an equal step structure, or when the pole body 120 realizes the connection function with external circuits, riveting blocks 300, etc. and the connection function with pole plate 110 through different parts, the pole body 120 can be divided into multiple parts including a first body 121, a second body 122, etc., and a groove 130 is opened at appropriate positions in some of them to realize heat dissipation.

[0066] like Figure 1 , Figure 2 As shown, in one embodiment, the pole body 120 includes a first body 121 and a second body 122. The first body 121 and the second body 122 are connected in sequence and coaxially arranged. The second body 122 is connected to the pole plate 110, and a plurality of grooves 130 are disposed on the second body 122.

[0067] The first body 121 is used to install the riveting block and connect to the external circuit. The second body 122 is connected to the electrode plate 110. The current from the electrode tab 31 is conducted to the second body 122 through the electrode plate 110 and output through the first body 121. The second body 122 is located close to the electrode plate 110 and close to heat sources such as the electrochemical reaction zone inside the cell, and serves as the main area for heat dissipation of the electrode 100. The slot 130 is located on the second body 122, and multiple slots 130 are arranged circumferentially along the second body 122 to achieve efficient heat dissipation. Compared with the first body 121, the location of the slot 130 on the second body 122 can reduce the impact on the external structure and reduce the processing difficulty.

[0068] When the pole body 120 is configured as a stepped structure, such as Figure 2 As shown, in one embodiment, the outer diameter of the second body 122 is larger than the outer diameter of the first body 121.

[0069] In this way, a stepped mechanical strength can be provided, optimizing the overall structural strength. The second body 122 plays a major role in heat dissipation and reduces the heat diffused outward through the first body 121, reducing potential contact problems caused by high temperatures. The second body 122 connects the first body 121 and the pole plate 110. Setting the outer diameter of the second body 122 to be larger than that of the first body 121 can also improve the overall structural strength of the pole 100. The second body 122 also serves a supporting role, supporting structures such as the rivet block 300 installed on the first body 121, facilitating subsequent assembly and reducing protection costs.

[0070] In one embodiment, each groove 130 extends axially along the pole body 120. When the groove 130 is disposed on the second body 122, each groove 130 extends axially along the second body 122.

[0071] When the electrode 100 is working, the heat generated by current conduction is transferred axially from the electrode plate 110 to the second body 122 and the first body 121. The groove 130 extends axially along the second body 122, and the extension direction of the groove 130 is parallel to the heat flow direction. Compared with grooves arranged circumferentially or at an angle, the groove 130 arranged axially has a larger heat dissipation surface area per unit length, which can achieve efficient heat dissipation. Since the first body 121 and the second body 122 are coaxially connected and the outer diameter of the second body 122 is larger, the second body 122 serves as the main heat dissipation area. The arrangement of the axially extending groove 130 on the second body 122 can directly enhance the heat dissipation efficiency. In addition, the first body 121 is mainly used to install the rivet block 300 and connect external circuits, while the second body 122 provides support and positioning for the rivet block 300 and other structures through the difference in outer diameter with the first body 121, so as to facilitate the assembly of the rivet block 300. An axial groove 130 is provided in the circumference of the second body 122, which can reduce the interference of the groove 130 on the connection function of the first body 121 (such as causing poor riveting of the rivet block 300), reduce the impact on the connection of external circuits, and also take into account the heat dissipation function.

[0072] Because the outer diameter of the second body 122 is larger than the outer diameter of the first body 121, the groove 130 is recessed from the periphery of the pole body 120 toward the center of the pole body 120. Compared with the first body 121, the groove 130 is located on the second body 122 and extends along the axial direction of the second body 122, which can also reduce the strength requirements of the pole 100.

[0073] like Figure 2 , Figure 3 As shown, in one embodiment, the difference between the outer diameter of the second body 122 and the groove depth of the groove 130 is not less than the outer diameter of the first body 121.

[0074] Because the pole post 100 needs to withstand mechanical stresses such as tightening forces during installation, setting the difference between the outer diameter of the second body 122 and the groove depth of the groove 130 to be no less than the outer diameter of the first body 121 can reduce potential deformation and breakage of the pole post 100, and prevent heat from being ineffectively conducted to the surface of the groove 130 for heat dissipation due to excessive groove depth. This also ensures the reliability of the electrical connection, prevents excessive groove depth of the groove 130 from affecting conductivity, and to a certain extent ensures the stability of electrical performance.

[0075] like Figure 3 As shown, in one embodiment, the cross-section of the groove 130 is any one of quadrilateral, semicircular, semi-elliptical, or triangular.

[0076] The cross-section of the tank 130 can be rectangular, trapezoidal, or other quadrilaterals to increase the contact area with air and further optimize heat dissipation. Quadrilaterals are also easier to mold and facilitate mass production. The cross-section of the tank 130 can also be semi-circular, semi-elliptical, or other curved shapes to reduce air resistance and enhance heat dissipation. The cross-section of the tank 130 can also be triangular, allowing the tank wall to maintain rigidity even at greater depths, reducing potential deformation.

[0077] Each groove 130 extends axially along the second body 122. When the first body 121 is used to connect with the riveting block 300, the end of the groove 130 near the first body 121 is connected to the riveting block 300 to shorten the gas outlet path inside the cell and facilitate the rapid transfer of gas inside the cell from one end of the groove 130 to the riveting block 300 and discharge through the riveting block 300. The other end of the groove 130 does not penetrate the electrode plate 110 to avoid electrolyte leakage when the electrode 100 is installed on the cover plate assembly 10 and applied to the cell.

[0078] In one embodiment, the terminal post 100 further includes a sealing ring 140, which surrounds the terminal post body 120. The sealing ring 140 can be disposed between the terminal post body 120 and the terminal post plate 110; it can be disposed on the terminal post plate 110; or it can be disposed on the terminal post body 120. When the terminal post 100 is disposed on the cover plate assembly 10 and applied to the battery cell, the sealing ring 140 can play a sealing role, preventing electrolyte leakage inside the battery cell, and at the same time, it can prevent external air and moisture from entering the battery cell to a certain extent, thus avoiding affecting the performance and safety of the battery cell.

[0079] like Figure 4 , Figure 5As shown, in some embodiments, this application provides a cover plate assembly 10, which includes a cover plate body 200 and a pole post 100. The cover plate body 200 is provided with a first through hole 210; the pole post body 120 of the pole post 100 is disposed through the first through hole 210.

[0080] The electrode post 100 is disposed through the first through hole 210 of the cover plate body 200. The first through hole 210 is used to position and support the electrode post 100. When the cover plate assembly 10 is disposed at the opening of the battery cell housing 20, the electrode post 100 is used to lead the current of the electrodes inside the battery cell to the external circuit. Since the electrode post 100 may bear mechanical force when connected to the external circuit, the load can also be distributed through the first through hole 210 and the cover plate assembly 10.

[0081] The specific structure of the pole post 100 is as described in the above embodiments. Since this cover plate assembly 10 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0082] like Figure 5 , Figure 6 As shown, in one embodiment, the cover plate assembly 10 further includes a riveting block 300, which is disposed on the cover plate body 200. The riveting block 300 has a second through hole 310 through which the pole body 120 passes. The cover plate body 200 has a first side and a second side disposed opposite to each other. The riveting block 300 is disposed on the first side, and the pole body 120 passes through the second through hole 310 of the riveting block 300. This can, to a certain extent, avoid loosening caused by stress concentration due to direct connection with the cover plate assembly 10. The riveting block 300 can also help conduct the heat generated when the pole 100 is energized.

[0083] A venting groove 320 is provided on the side of the riveting block 300 near the cover plate body 200, and the venting groove 320 is connected to the groove body 130. The venting groove 320, located on the side of the riveting block 300 near the cover plate body 200, can be any combination of one or more shapes, such as ring or strip. When the cover plate is placed over the opening of the battery cell casing 20, the venting groove 320 of the riveting block 300 is connected to the groove body 130, which can further increase the heat dissipation area. During the charging and discharging process of the battery, gas is generated inside due to electrochemical reactions. The venting groove 320 can guide the gas, allowing it to escape from the battery cell, reducing the risk of the casing 20 expanding or even exploding due to high internal gas pressure, and promptly dissipating the hot gas generated inside the battery.

[0084] like Figure 6 , Figure 7As shown, in one embodiment, each groove 130 extends along the axial direction of the pole body 120; the groove 130 is connected to the air inlet end of the vent groove 320; the air outlet end of the vent groove 320 is located near the outer periphery of the rivet block 300.

[0085] The air inlet end of the venting groove 320 is located near the second through hole 310 and communicates with the groove body 130. This shortens the gas outlet path inside the battery cell and facilitates the rapid transfer of gas from the groove body 130 to the air inlet end of the venting groove 320 of the riveting block 300, and discharges it through the air outlet end of the venting groove 320 formed on the outer periphery of the riveting block 300. Compared to grooves arranged circumferentially or at an angle, the axially arranged groove body 130 has a larger heat dissipation surface area per unit length, achieving efficient heat dissipation. The other end of the groove body 130 does not penetrate the electrode plate 110 to avoid electrolyte leakage when the electrode 100 is installed on the cover plate assembly 10 and applied to the battery cell. The gas inside the battery cell is distributed as follows: Figure 6 The path indicated by the arrow transmits the gas from one end of the groove 130 to the vent groove 320 of the rivet block 300, and then discharges it through the vent end formed on the outer periphery of the rivet block 300 through the vent groove 320. In this way, the heat generated by the pole can be better convected with the outside air, improving heat dissipation. To a certain extent, this can prevent the gas from not being discharged in time and reduce the deformation problem that may occur in the cover plate due to gas imbalance.

[0086] like Figure 7 , Figure 8 As shown, in one embodiment, the ventilation groove 320 includes a plurality of first grooves 321 and a plurality of second grooves 322. The first grooves 321 extend along a first direction, and the second grooves 322 extend along a second direction. The plurality of first grooves 321 and the plurality of second grooves 322 are interconnected.

[0087] Multiple first grooves 321 can be arranged parallel to each other or at a certain angle, and multiple second grooves 322 can be arranged parallel to each other or at a certain angle. The first grooves 321 and second grooves 322 of the ventilation groove 320 are arranged in a crisscross pattern to increase the heat dissipation area and further improve the heat transfer efficiency.

[0088] In some other embodiments, the ventilation groove 320 may include only the first groove 321 extending along the first direction, only the second groove 322 extending along the second direction, or may be configured as an arc or other arbitrary shape extending from the second through hole 310 to the outer periphery, which is not limited here.

[0089] like Figure 9As shown, in one embodiment, the cover plate assembly 10 further includes a first insulating member 510. The first insulating member 510 is disposed between the cover plate body 200 and the riveting block 300, and surrounds the riveting block 300. The first insulating member 510 has a third through hole through which the electrode post 100 passes. The first insulating member 510 can, to a certain extent, prevent the riveting block 300 from directly contacting the cover plate body 200 and causing the risk of leakage, and is used to further block the leakage of electrolyte in the battery cell.

[0090] The first insulating component 510 and the riveting block 300 have a gap that communicates with the vent groove 320, in order to further optimize the exhaust effect.

[0091] To facilitate assembly and improve assembly efficiency, the cover plate body 200 may be provided with a first mounting groove for the first insulating component 510 to be installed; the periphery of the first insulating component 510 is surrounded by a riveting block, forming a second mounting groove for the riveting block 300 to be installed, so as to achieve a stable connection between the first insulating component 510, the riveting block 300 and the cover plate body 200.

[0092] In one embodiment, the cover plate assembly 10 further includes a second insulating member 520, which is disposed on a second side of the cover plate body. In the assembled state, the second side of the cover plate assembly 10 is disposed close to the interior of the cell housing 20. The second insulating member 520 can prevent metal parts such as the electrode post 100 and the riveting block 300 from contacting the active material of the cell, thereby reducing the risk of short circuit and blocking the electrolyte to prevent the electrolyte inside the cell from entering the cover plate assembly 10.

[0093] In one embodiment, the number of pole post 100 and riveting fastener is one, and the cover plate body 200 is provided with a first through hole 210. The pole post 100 can be either a positive pole post or a negative pole post, to suit the application of a single pole post cover plate assembly.

[0094] like Figure 9 As shown, in one embodiment, there are two pole posts 100 and two riveting blocks 300, and the cover plate body 200 is provided with two first through holes 210.

[0095] One of the two terminals 100 is a positive terminal and the other is a negative terminal, with the positive and negative terminals spaced apart. A first insulating element 510 can be provided on the first side of the cover plate assembly 10, or two first insulating elements 510 can be provided corresponding to each of the two terminals 100. Similarly, one or two second insulating elements 520 can be provided on the second side of the cover plate body 200; the specific configuration can be determined according to actual needs to suit the application of the bipolar terminal cover plate assembly; no limitation is imposed here.

[0096] like Figure 10 As shown, some embodiments of this application also propose a battery cell including a housing 20, an inner core 30, and a cover plate assembly 10.

[0097] The housing 20 has an opening; the cover assembly 10 is disposed at the opening of the housing 20; the inner core 30 is disposed within the receiving space formed by the housing 20 and the cover assembly 10. This receiving space can provide a relatively stable environment for the electrochemical reaction, making the charging and discharging process of the cell more stable and optimizing the cell performance; and by providing mechanical protection for the inner core 30, it reduces the possibility of electrolyte leakage. The specific structure of the cover assembly 10 is as described in the above embodiments. Since this cell adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0098] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An electrode post, characterized in that, include: pole plate body; The electrode post body is disposed on the electrode post plate; The outer wall of the pole body is provided with a plurality of grooves arranged circumferentially along the pole body, and the grooves extend to the side away from the pole plate and penetrate the pole body.

2. The pole post as described in claim 1, characterized in that, The pole body includes: First subject; The second body is connected in sequence and coaxially arranged with the first body and the second body connected to the pole plate. The second body is provided on the second body.

3. The pole post as described in claim 2, characterized in that, The outer diameter of the second body is larger than the outer diameter of the first body.

4. The pole post as described in claim 2, characterized in that, Each of the grooves extends axially along the second body.

5. The pole post as described in claim 2, characterized in that, The difference between the outer diameter of the second main body and the depth of the groove is not less than the outer diameter of the first main body.

6. The pole post as described in any one of claims 1 to 5, characterized in that, The cross-section of the groove is any one of quadrilateral, semi-circular, semi-elliptical, or triangular.

7. A cover plate assembly, characterized in that, include: The cover plate body has a first through hole; as well as The pole post as described in any one of claims 1 to 6, wherein the pole post body is disposed through the first through hole.

8. The cover plate assembly as claimed in claim 7, characterized in that, The cover plate assembly further includes a riveting block, which is disposed on the cover plate body and has a second through hole for the pole body to pass through; The rivet block has a ventilation groove on the side near the cover plate body, and the ventilation groove is connected to the groove body.

9. The cover plate assembly as claimed in claim 8, characterized in that, Each of the aforementioned grooves extends axially along the pole body; The groove is connected to the air inlet end of the ventilation groove; the air outlet end of the ventilation groove is located near the outer periphery of the riveting block.

10. The cover plate assembly as claimed in claim 8, characterized in that, The ventilation groove includes a plurality of first grooves and a plurality of second grooves. The first grooves extend along a first direction, and the second grooves extend along a second direction. The plurality of first grooves and the plurality of second grooves are interconnected.

11. The cover plate assembly as claimed in claim 8, characterized in that, The cover plate assembly further includes a first insulating member, which is disposed between the cover plate body and the riveting block and surrounds the riveting block. The first insulating member has a third through hole through which the pole post passes. The first insulating component and the riveting block have a gap that communicates with the vent groove.

12. The cover plate assembly as claimed in claim 8, characterized in that, The number of pole posts and the number of rivet blocks are both two, and the cover plate body is provided with two first through holes.

13. A battery cell, characterized in that, Includes a housing, an inner core, and a cover plate assembly as described in any one of claims 7 to 12; The shell is provided with an opening; The cover assembly is disposed at the opening of the housing; The inner core is disposed within the receiving space formed by the housing and the cover plate assembly.

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