Cover assembly and battery cell

Abstract

The application relates to the technical field of batteries, and provides a cover plate assembly and a battery monomer. The cover plate assembly comprises a cover plate body and an insulating piece arranged on one side of the cover plate body; one side of the insulating piece away from the cover plate body is provided with a first boss, the first boss is provided with a first open cavity, and the opening of the first open cavity is opposite to a liquid injection hole on the cover plate body; the first open cavity is provided with a first via hole at the connection position of the side wall and the bottom wall of the first open cavity, and the first via hole penetrates through the first boss; the first open cavity is provided with a shielding part, the shielding part is arranged between the first via hole and the liquid injection hole, and the shielding part, the side wall of the first open cavity and the bottom wall of the first open cavity form a channel, and the channel is connected with the first open cavity and the first via hole. According to the cover plate assembly, even if the tab is attached to the first boss under the action of negative pressure, the first via hole is not completely blocked, the exhaust function can be maintained, and the vacuum extraction efficiency of the battery monomer is improved.

Description

Technical Field

[0001] This application 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 typically consists of a casing and a cover assembly that seals the casing. The casing houses the electrode assembly, which is immersed in electrolyte. The cover assembly has an injection port for injecting electrolyte into the casing. After injection, the inside of the battery is usually evacuated to remove moisture, impurities, and gases, and to test for airtightness, ensuring the performance and safety of the battery cell.

[0003] However, during the vacuuming process of a battery cell, the tabs on the electrode assembly may move and block the liquid injection hole due to the negative pressure inside the casing. If the vacuuming continues, the tabs may block the exhaust channel, which is not conducive to improving the vacuuming efficiency of the battery cell. Utility Model Content

[0004] In view of this, this application aims to propose a cover assembly to improve the vacuuming efficiency of individual battery cells.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover plate assembly includes a cover plate body and an insulating member disposed on one side of the cover plate body; The insulating component has a first protrusion on the side facing away from the cover plate body, and a first open mouth body is provided on the first protrusion body. The opening of the first open mouth body is directly opposite the liquid injection hole on the cover plate body. The first open mouth body has a first through hole at the connection between its side wall and bottom wall, and the first through hole passes through the first boss; The first open cavity body is provided with a shielding part, which is positioned between the first through hole and the injection hole. The shielding part, the side wall of the first open cavity body, and the bottom wall of the first open cavity body form a channel, which connects the first open cavity body and the first through hole.

[0006] Furthermore, at least two of the first vias and the blocking portions are arranged, and each of the first vias corresponds to one blocking portion.

[0007] Furthermore, one end of the shielding part is connected to the side wall of the first open mouth body, and the other end of the shielding part is connected to the bottom wall of the first open mouth body, so that the shielding part spans across the first through hole.

[0008] Furthermore, the shielding portion includes a first part and a second part that are vertically connected, the first part being connected to the bottom wall of the first open oral cavity, and the second part being connected to the side wall of the first open oral cavity.

[0009] Furthermore, the insulating component has a second protrusion on the side facing away from the cover plate body, and the first protrusion and the second protrusion are respectively located at both ends of the insulating component in the length direction; The first protrusion and the second protrusion can jointly abut against the electrode assembly inside the battery cell casing.

[0010] Furthermore, the second protrusion is provided with a second open mouth body, the opening of the second open mouth body faces the cover plate body, and the bottom wall of the second open mouth body is provided with a fourth through hole, the fourth through hole penetrating the second protrusion.

[0011] Furthermore, a second through hole is provided on the bottom wall of the first open oral cavity at a location not directly opposite the injection hole, and the second through hole penetrates the first boss.

[0012] Furthermore, the first open oral cavity body has a third through hole at the connection between its side wall and bottom wall.

[0013] Furthermore, the insulating component is provided with a third open cavity body arranged opposite to the cover plate body, and the third open cavity body is provided with reinforcing ribs.

[0014] Furthermore, along the injection direction, the injection hole includes a connected outer hole and an inner hole, wherein the diameter of the inner hole is smaller than that of the outer hole; The cover assembly includes a sealing plug capable of sealing the inner hole and a sealing cap capable of sealing the outer hole. The sealing cap is welded to the cover body and is capable of preventing the sealing plug from dislodging from the inner hole.

[0015] Compared with related technologies, this application has the following advantages: (1) The cover plate assembly described in this application, by providing a first protrusion with a first open mouth body, can temporarily store the injected electrolyte and guide the electrolyte to the first through hole to flow into the housing. The first through hole penetrates both the side wall and the bottom wall of the first open mouth body. Even if the electrode tab is attached to the first protrusion under negative pressure, the first through hole will not be completely blocked, thus maintaining the venting function and improving the vacuuming efficiency of the battery cell. At the same time, the shielding part can shield the first through hole, so that the electrolyte entering from the injection hole will not directly enter the first through hole and impact the electrode assembly. This can buffer the electrolyte and effectively reduce the damage to the electrode assembly caused by the electrolyte injection pressure.

[0016] (2) Setting the first through hole and the shielding part to at least two allows the electrolyte to enter the shell from the first open mouth body more paths, the electrolyte enters more smoothly, and each first through hole will not be completely blocked by the tab, which is beneficial to maintaining the efficiency during vacuuming.

[0017] (3) One end of the shielding part is connected to the side wall of the first open mouth body, and the other end is connected to the bottom wall and spans across the first through hole. This connection method makes the shielding part and the first open mouth body form a stable integral structure, which enhances the load-bearing capacity and deformation resistance of the shielding part, and can more comprehensively cover the first through hole, ensuring the shielding effect of the through hole.

[0018] (4) Setting the shielding part as a first part and a second part that are vertically connected can make the shielding part have better structural strength and the shielding part is not easily deformed.

[0019] (5) A second protrusion is provided, and the first protrusion and the second protrusion are placed at both ends of the lower plastic length direction, so that the second protrusion and the first protrusion can work together to press the two ends of the electrode group respectively, which is beneficial to improve the fixing effect of the electrode group, making the electrode group less prone to movement and more stable.

[0020] (6) A second open cavity is provided on the second protrusion, and a fourth through hole is provided on the bottom wall of the second open cavity. The electrolyte can enter the second open cavity through the fourth through hole. The second open cavity can store the electrolyte, which is equivalent to increasing the electrolyte injection volume of the battery cell, which is beneficial to improving the service life of the battery cell.

[0021] (7) Setting a second through hole can increase the flow rate of electrolyte entering the shell from the first open mouth body. The injection hole and the second through hole are not directly opposite each other. The electrolyte entering through the injection hole will not directly pass through the second through hole and impact the electrode assembly. This can buffer the electrolyte and effectively reduce the damage to the electrode assembly caused by the electrolyte injection pressure. Setting a third through hole can provide a path for the electrolyte to enter the shell and at the same time provide an exhaust path.

[0022] (8) Setting a third open cavity on the insulating part can reduce the weight of the insulating part and is conducive to the lightweight design of the battery cell. At the same time, setting a reinforcing rib can enhance the structural strength of the insulating part at the third open cavity, making the insulating part less prone to deformation.

[0023] (9) The sealing plug and sealing cap can form a double seal, which is beneficial to improving the reliability of the seal and effectively preventing electrolyte leakage. The welded sealing cap has high connection strength, which is beneficial to the sealing and reliability of the battery cell during long-term use.

[0024] Another object of this application is to provide a battery cell having the above-described cover assembly.

[0025] The battery cell described in this application, by setting the aforementioned cover assembly, can prevent the electrolyte from directly entering the first through hole and impacting the electrode assembly during the electrolyte injection operation. This can buffer the electrolyte, effectively reduce the damage to the electrode assembly caused by the electrolyte injection pressure, and improve the quality of the finished battery cell. During the vacuuming process of the battery cell, even if the electrode tab is attached to the first protrusion under negative pressure, the first through hole will not be completely blocked, maintaining the venting function. This is beneficial to improving the vacuuming efficiency of the battery cell, and thus improving the production efficiency of the battery cell. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an overall schematic diagram of the cover plate assembly described in the embodiments of this application; Figure 2 This is an overall schematic diagram of the cover plate assembly described in an embodiment of this application from another perspective; Figure 3 This is a top view of the cover plate assembly described in the embodiments of this application; Figure 4 for Figure 3 Sectional view at point AA; Figure 5 This is a schematic diagram of the structure of the insulating component described in the embodiments of this application; Figure 6 This is a schematic diagram of the insulating component described in an embodiment of this application from another perspective; Figure 7 This is a schematic diagram of the structure of the injection hole as described in the embodiment of this application; Figure 8 This is an overall schematic diagram of the battery cell described in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Cover plate body; 101. Injection hole; 1011. Inner hole; 1012. Outer hole; 2. Insulating component; 201. First boss; 202. First open mouth body; 203. First through hole; 204. Shielding part; 2041. First part; 2042. Second part; 205. Second boss; 206. Second open mouth body; 207. Second through hole; 208. Third through hole; 209. Fourth through hole; 210. Third open mouth body; 211. Reinforcing rib; 2111. Structural rib; 2112. Limiting rib; 212. Mounting part; 3. Electrode assembly; 301. Electrode tab; 4. Housing; 401. Explosion-proof valve; 5. Sealing plug; 6. Sealing cap; 601. Protrusion; 7. Pole post; 8. Insulating film; a. Passage. Detailed Implementation

[0027] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0029] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application 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 on this application. In addition, 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.

[0030] Furthermore, in the description of this application, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0031] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0033] An embodiment of the first aspect of this application provides a battery cell that facilitates improving the vacuuming efficiency of the battery cell.

[0034] In related technologies, a battery cell typically includes a casing and a cover assembly that seals the casing. The casing houses the electrode assembly, which is immersed in electrolyte. The cover assembly has an injection hole for injecting electrolyte into the casing. After injection, the battery interior is usually evacuated to remove moisture, impurities, and gases, and to test for airtightness, ensuring the performance and safety of the battery cell.

[0035] However, during the vacuuming process of a battery cell, the tabs on the electrode assembly may move and block the electrolyte injection hole due to the negative pressure inside the casing. If the vacuuming continues, the tabs may block the exhaust channel, resulting in incomplete exhaust of the battery cell. This requires increasing the number of exhaust and electrolyte injection cycles to ensure that the moisture and impurities in the battery cell are effectively removed, which is not conducive to improving the vacuuming efficiency of the battery cell.

[0036] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly of this embodiment combines... Figures 1 to 6 As shown, the overall design includes a cover plate body 1 and an insulating component 2 located on one side of the cover plate body 1.

[0037] The insulating component 2 has a first protrusion 201 on the side facing away from the cover plate body 1. The first protrusion 201 has a first open mouth body 202, the opening of which faces the injection hole 101 on the cover plate body 1. The first open mouth body 202 has a first through hole 203 at the connection between its side wall and bottom wall, and the first through hole 203 passes through the first protrusion 201. The first open mouth body 202 has a blocking part 204 inside, which blocks the first through hole 203 and the injection hole 101. The blocking part 204, the side wall of the first open mouth body 202, and the bottom wall of the first open mouth body 202 form a channel a, which connects the first open mouth body 202 and the first through hole 203.

[0038] Therefore, by setting a first protrusion 201 with a first open mouth body 202, the injected electrolyte can be temporarily stored and guided to the first through hole 203 to flow into the housing 4. The first through hole 203 penetrates both the side wall and the bottom wall of the first open mouth body 202. Even if the tab 301 is attached to the first protrusion 201 under negative pressure, the first through hole 203 will not be completely blocked, thus maintaining the venting function and improving the vacuuming efficiency of the battery cell.

[0039] Meanwhile, the shielding part 204 can shield the first through hole 203, so that the electrolyte entering from the injection hole 101 will not directly enter the first through hole 203 and impact the electrode group 3. This can buffer the electrolyte and effectively reduce the damage to the electrode group 3 caused by the electrolyte injection pressure.

[0040] Based on the above overview, specifically, the cover plate body 1 of the battery cell is welded to the housing 4, forming a sealed inner cavity between them to accommodate the electrode assembly 3 and the electrolyte, with the electrode assembly 3 immersed in the electrolyte. The insulating component 2 is used to protect the battery cell structure and serves as electrical insulation and shock absorption. The insulating component 2 is located on the side of the cover plate facing inwards from the housing 4 and is assembled onto the cover plate body 1. The specific assembly method can be referred to the description in related technologies, and will not be repeated here.

[0041] Continue to combine Figures 1 to 6 As shown, in some exemplary embodiments, at least two first vias 203 and shielding portions 204 are arranged, and each first via 203 corresponds to one shielding portion 204. In the thickness direction of the insulating member 2, the shielding portion 204 can completely block the first via 203.

[0042] With this configuration, setting the first through hole 203 and the shielding part 204 to at least two, the electrolyte can enter the housing 4 through the first open mouth body 202 more often, and the electrolyte can enter more smoothly. At the same time, each of the first through holes 203 will not be completely blocked by the tabs 301, which is beneficial to maintaining the efficiency during vacuuming.

[0043] Preferably, a first through hole 203 can be provided on each of the two opposite cavity walls within the first open cavity body 202, and two shielding parts 204 can be provided, corresponding one-to-one with each of the first through holes 203. Of course, it is also possible to provide multiple first through holes 203 around the inner wall of the first open cavity body 202. Multiple first through holes 203 are beneficial for dispersing the electrolyte, allowing the electrolyte to enter the housing 4 more evenly. Moreover, the shielding parts 204 can also be configured to shield multiple first through holes 203, thereby simplifying the insulating component 2.

[0044] See Figure 5 In some exemplary embodiments, one end of the shielding portion 204 is connected to the side wall of the first open mouth body 202, and the other end of the shielding portion 204 is connected to the bottom wall of the first open mouth body 202, such that the shielding portion 204 spans across the first through hole 203.

[0045] In this embodiment, one end of the shielding part 204 is connected to the side wall of the first open mouth body 202, and the other end is connected to the bottom wall and spans across the first through hole 203. This connection method makes the shielding part 204 and the first open mouth body 202 form a stable integral structure, which enhances the load-bearing capacity and deformation resistance of the shielding part 204, and can more comprehensively cover the first through hole 203, ensuring the shielding effect on the through hole.

[0046] In specific implementation, the shielding part 204 is positioned above the first through hole 203. Both sides below the shielding part 204 can serve as the inlet and outlet of channel a. Therefore, when injecting electrolyte, channel a has two inlets, and the electrolyte flows out from the first through hole 203 after passing through channel a. When evacuating the battery cell, channel a has two outlets, the first through hole 203 being the inlet of channel a.

[0047] Furthermore, in some exemplary embodiments, the shielding portion 204 includes a first portion 2041 and a second portion 2042 that are vertically connected. The first portion 2041 is connected to the bottom wall of the first open mouth body 202, and the second portion 2042 is connected to the side wall of the first open mouth body 202. The shielding portion 204 is generally L-shaped and spans the first through hole 203, with the corner of the shielding portion 204 facing the interior of the first open mouth body 202. Thus, by setting the shielding portion 204 as a vertically connected first portion 2041 and second portion 2042, the shielding portion 204 can have better structural strength and is not easily deformed.

[0048] Reference Figure 2 , Figure 5 and Figure 6 In some exemplary embodiments, a second through hole 207 is provided on the bottom wall of the first open oral cavity 202 at a location not directly opposite the injection hole 101. The second through holes 207 penetrate the first boss 201 and are densely arranged, that is, the injection hole 101 is directly opposite the bottom wall of the first open oral cavity 202.

[0049] As configured above, the second through hole 207 can increase the flow rate of electrolyte entering the housing 4 from the first open mouth body 202. The injection hole 101 and the second through hole 207 are staggered. The electrolyte entering through the injection hole 101 will not directly pass through the second through hole 207 and impact the electrode assembly 3. This can buffer the electrolyte and effectively reduce the damage to the electrode assembly 3 caused by the electrolyte injection pressure.

[0050] Continue to refer to Figure 2 , Figure 5 and Figure 6In some exemplary embodiments, the first open cavity body 202 has a third through hole 208 at the junction of its side wall and bottom wall. The third through hole 208 provides a path for the electrolyte to enter the housing 4, and also provides an venting path.

[0051] Preferably, the third through hole 208 can be set to a smaller size and the third through hole 208 can be inserted through the first boss 201 along the length of the insulating member 2. This arrangement allows the electrolyte passing through the third through hole 208 to flow out along the length of the insulating member 2, reducing the impact on the electrode assembly 3.

[0052] Re-reference Figures 1 to 6 In some exemplary embodiments, the insulating member 2 has a second protrusion 205 on the side facing away from the cover plate body 1, and the first protrusion 201 and the second protrusion 205 are respectively located at both ends of the insulating member 2 along its length. The first protrusion 201 and the second protrusion 205 can jointly abut against the electrode group 3 inside the battery cell housing 4.

[0053] In this embodiment, a second protrusion 205 is provided on the insulating member 2, and the first protrusion 201 and the second protrusion 205 are respectively located at both ends in the length direction of the lower plastic. This allows the second protrusion 205 and the first protrusion 201 to cooperate and press the two ends of the electrode assembly 3 respectively, which helps to improve the compression and fixing effect of the electrode assembly 3, making the electrode assembly 3 less prone to movement and providing better stability. Specifically, the first protrusion 201 and the second protrusion 205 can both be set as cuboids, and their width in the width direction of the insulating member 2 can be the same as that of the insulating member 2, which can better fit the inner wall of the housing 4.

[0054] Based on the second boss 205 on the insulating member 2, in some exemplary embodiments, the second boss 205 is provided with a second open mouth body 206, the opening of the second open mouth body 206 faces the cover plate body 1, and the bottom wall of the second open mouth body 206 is provided with a fourth through hole 209, which penetrates the second boss 205.

[0055] In this way, a second open cavity body 206 is provided on the second boss 205, and a fourth through hole 209 is provided on the bottom wall of the second open cavity body 206. Electrolyte can enter the second open cavity body 206 through the fourth through hole 209. The second open cavity body 206 can play the role of storing electrolyte, which is equivalent to increasing the electrolyte injection volume of the battery cell and is beneficial to improving the service life of the battery cell.

[0056] In this embodiment, both the first via 203 and the second via 207 can be circular holes. Of course, in addition to circular holes, elongated holes, rectangular holes, or other irregularly shaped holes can also be used.

[0057] In practical implementation, the dimension of the second protrusion 205 along the length of the insulating member 2 can be set to be smaller than that of the first protrusion 201, which helps to reduce the weight and volume of the insulating member 2. Secondly, the end of the second protrusion 205 facing away from the cover plate body 1 can be flush with the end of the first protrusion 201 facing away from the cover plate body 1, which helps to improve the firmness of the compression and fixation of the first protrusion 201 and the second protrusion 205 to the pole group 3.

[0058] In some embodiments, the insulating member 2 is provided with a mounting portion 212 for mounting the electrode post 7. The mounting portion 212 is located between the first boss 201 and the second boss 205, and is arranged close to the second boss 205. With this arrangement, by providing the mounting portion 212 on the insulating member 2, the mounting portion 212 can be moved away from the liquid injection hole 101. This allows the electrode post 7 mounted on the mounting portion 212 to be located away from the position of the liquid injection hole 101, thereby preventing overflowing electrolyte from contaminating the electrode post 7 during liquid injection.

[0059] Specifically, the mounting part 212 may include mounting holes formed on the insulating part 2. The pole post 7 passes through the mounting holes and the through holes on the cover plate body 1 in sequence, and is riveted together with the riveting block to realize the installation of the pole post 7.

[0060] In addition, refer to Figure 2 , Figure 4 and Figure 6 As shown, in some exemplary embodiments, the insulating member 2 is provided with a third open mouth body 210 arranged opposite to the cover plate body 1, and the third open mouth body 210 is provided with reinforcing ribs 211.

[0061] This design allows the third open cavity 210 on the insulating component 2 to reduce the weight of the insulating component 2, which is beneficial for the lightweight design of the battery cell. At the same time, the reinforcing rib 211 can enhance the structural strength of the insulating component 2 at the third open cavity 210, making the insulating component 2 less prone to deformation.

[0062] Specifically, the reinforcing rib 211 may include structural ribs 2111 extending along the length of the insulating member 2, and limiting ribs 2112 for defining the position of the rivet block. The two sides of the limiting rib 2112 are connected to the first boss 201 and the second boss 205 respectively through the structural ribs 2111. Preferably, two structural ribs 2111 can be provided on each side of the limiting rib 2112, for a total of four ribs.

[0063] Regarding the structure of injection hole 101, refer to... Figure 4 and Figure 7In some exemplary embodiments, along the injection direction, the injection hole 101 includes a communicating outer hole 1012 and an inner hole 1011, the diameter of the inner hole 1011 being smaller than that of the outer hole 1012. The cover assembly includes a sealing plug 5 capable of sealing the inner hole 1011 and a sealing cap 6 capable of sealing the outer hole 1012, the sealing cap 6 being welded to the cover body 1 and capable of preventing the sealing plug 5 from dislodging from the inner hole 1011.

[0064] With this configuration, the sealing plug 5 and the sealing cap 6 can form a double seal, which helps to improve the reliability of the seal and effectively prevent electrolyte leakage. The welded sealing cap 6 has high connection strength, which helps to improve the sealing performance and reliability of the battery cell during long-term use.

[0065] Specifically, the sealing plug 5 can be press-fitted into the inner hole 1011, with the sealing plug 5 being an interference fit within the inner hole 1011. The sealing cover 6 has a protrusion 601 on the side facing the sealing plug 5, which can abut against the sealing plug 5, making it difficult for the sealing plug 5 to detach from the inner hole 1011. The protrusion 601 can, for example, be in the shape of a cylinder, cuboid, or the like.

[0066] The distance b between the bottom end of the sealing plug 5 and the bottom wall of the first open mouth body 202 is between 0.2 and 1 mm, which makes it less likely for the sealing plug 5 to be squeezed against the bottom wall of the first open mouth body 202 during the pressing process, thus reducing the risk of damage.

[0067] It is worth noting that, regarding the cover plate assembly of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 7 As shown, it may include, for example, a cover plate body 1, an pole post 7 mounted on the cover plate body 1, and an insulating member 2 mounted on the side of the cover plate body 1 facing the housing 4.

[0068] The cover plate body 1 is provided with a mounting part 212, and the pole post 7 is mounted on the cover plate body 1 through the mounting part 212, and can be welded to the pole tab 301 of the pole group 3.

[0069] Among them, the insulating component 2 has a first boss 201 and a second boss 205 at both ends of the insulating component 2 along its length direction.

[0070] The first protrusion 201 is provided with a first open mouth body 202. The first open mouth body 202 is provided with a first through hole 203 and a third through hole 208 at the connection between the inner side wall and the bottom wall. The bottom wall of the first open mouth body 202 is provided with a second through hole 207. The second through hole 207 is staggered from the liquid injection hole 101 on the cover plate body 1.

[0071] Two first through holes 203 are symmetrically provided inside the first open mouth body 202. An "L"-shaped blocking part 204 spans above each first through hole 203. The second through holes 207 are provided on both sides of the blocking part 204.

[0072] The second protrusion 205 is provided with a second open mouth body 206, and the bottom wall of the second open mouth body 206 is provided with a fourth through hole 209.

[0073] In the preferred embodiment of the above cover assembly, the specific configuration and arrangement of the cover body 1, insulating component 2, pole post 7, etc. can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover body 1, insulating component 2, pole post 7, etc. can also be referred to the descriptions in the above exemplary embodiments.

[0074] The cover assembly of this embodiment adopts the above design. By setting a first protrusion 201 with a first open mouth body 202, the injected electrolyte can be temporarily stored and guided to the first through hole 203 to flow into the housing 4. The first through hole 203 penetrates both the side wall and the bottom wall of the first open mouth body 202. Even if the tab 301 is attached to the first protrusion 201 under negative pressure, the first through hole 203 will not be completely blocked, thus maintaining the venting function and improving the vacuuming efficiency of the battery cell.

[0075] Secondly, the shielding part 204 can shield the first through hole 203, so that the electrolyte entering from the injection hole 101 will not directly enter the first through hole 203 and impact the electrode group 3. This can buffer the electrolyte and effectively reduce the damage to the electrode group 3 caused by the electrolyte injection pressure.

[0076] An embodiment of the second aspect of this application provides a battery cell having a cover assembly as described in the embodiment of the first aspect of this application.

[0077] Among them, reference Figure 7 and Figure 8 As shown, the battery cell also includes a housing 4, an electrode assembly 3 disposed within the housing 4, an insulating film 8 covering the electrode assembly 3, and a positive electrode cover assembly. The cover assembly of the embodiment of the first aspect of this application is used for the negative electrode of the battery cell. An explosion-proof valve 401 is provided in the middle of the housing 4.

[0078] In this embodiment, the battery cell, by setting the above-mentioned cover assembly, can have the shielding part 204 buffer the electrolyte during the electrolyte injection operation, which can effectively reduce the damage to the electrode group 3 caused by the electrolyte injection pressure and improve the quality of the finished battery cell.

[0079] Meanwhile, during the vacuuming process of the battery cell, even if the tab 301 is attached to the first protrusion 201 under negative pressure, the first through hole 203 and the third through hole 208 will not be completely blocked, thus maintaining the venting function. This is beneficial to improving the vacuuming efficiency of the battery cell, and consequently, improving the production efficiency of the battery cell.

[0080] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A cover plate assembly, characterized in that: Includes a cover plate body and an insulating component disposed on one side of the cover plate body; The insulating component has a first protrusion on the side facing away from the cover plate body, and a first open mouth body is provided on the first protrusion body. The opening of the first open mouth body is directly opposite the liquid injection hole on the cover plate body. The first open mouth body has a first through hole at the connection between its side wall and bottom wall, and the first through hole passes through the first boss; The first open cavity body is provided with a shielding part, which is positioned between the first through hole and the injection hole. The shielding part, the side wall of the first open cavity body, and the bottom wall of the first open cavity body form a channel, which connects the first open cavity body and the first through hole.

2. The cover plate assembly according to claim 1, characterized in that: Both the first via and the shielding portion are arranged in at least two configurations, and each first via corresponds to one shielding portion.

3. The cover plate assembly according to claim 2, characterized in that: One end of the shielding part is connected to the side wall of the first open mouth body, and the other end of the shielding part is connected to the bottom wall of the first open mouth body, so that the shielding part spans across the first through hole.

4. The cover plate assembly according to claim 3, characterized in that: The shielding portion includes a first part and a second part that are vertically connected. The first part is connected to the bottom wall of the first open oral cavity, and the second part is connected to the side wall of the first open oral cavity.

5. The cover plate assembly according to claim 1, characterized in that: The insulating component has a second protrusion on the side facing away from the cover plate body, and the first protrusion and the second protrusion are respectively located at both ends of the insulating component in the length direction. The first protrusion and the second protrusion can jointly abut against the electrode assembly inside the battery cell casing.

6. The cover plate assembly according to claim 5, characterized in that: The second protrusion is provided with a second open mouth body, the opening of the second open mouth body faces the cover plate body, and the bottom wall of the second open mouth body is provided with a fourth through hole, the fourth through hole penetrating the second protrusion.

7. The cover plate assembly according to claim 1, characterized in that: On the bottom wall of the first open oral cavity, a second through hole is provided at a location not directly opposite the injection hole, the second through hole penetrating the first boss; and / or, The first open oral cavity has a third through hole at the connection between its side wall and bottom wall.

8. The cover plate assembly according to claim 1, characterized in that: The insulating component is provided with a third open mouth body arranged opposite to the cover plate body, and the third open mouth body is provided with reinforcing ribs.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: Along the injection direction, the injection hole includes a connected outer hole and an inner hole, wherein the diameter of the inner hole is smaller than that of the outer hole; The cover assembly includes a sealing plug capable of sealing the inner hole and a sealing cap capable of sealing the outer hole. The sealing cap is welded to the cover body and is capable of preventing the sealing plug from dislodging from the inner hole.

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

Images