Battery and cover plate assembly thereof
By designing interconnected cavities and through-hole structures in the battery cover assembly, the problems of slow electrolyte injection speed and poor gas venting in traditional batteries are solved, achieving uniform electrolyte injection and rapid pressure relief, thus improving battery safety and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-24
AI Technical Summary
In traditional battery structures, the liquid flow path is singular during liquid injection, which can easily lead to localized liquid accumulation near the injection hole, resulting in a slower injection speed; poor gas venting also increases battery safety hazards.
Design a cover plate assembly including a first cavity and a second cavity that are connected to each other, and provide through holes at the bottom of the assembly. During liquid injection, electrolyte is injected simultaneously through the two through holes, and during depressurization, gas is quickly discharged through the two through holes. Combined with the structural design of the lower plastic, the overall rigidity and through hole layout are improved, avoiding local liquid accumulation and rapid depressurization.
It improves electrolyte injection efficiency, avoids localized electrolyte accumulation, ensures uniform electrolyte distribution, and enhances battery pressure relief efficiency and safety.
Smart Images
Figure CN224554447U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery and its cover assembly. Background Technology
[0002] The smoothness of the battery electrolyte filling process affects battery production efficiency and quality. Furthermore, during battery use, internal chemical reactions produce gas. If this gas cannot be released in time, it will lead to increased internal pressure, posing a safety hazard. In traditional battery structures, the liquid flow path during filling is singular, easily leading to localized liquid accumulation near the filling hole, slowing down the filling speed, or even preventing complete filling. In addition, when gas is generated inside the battery, poor venting can prevent the explosion-proof valve from effectively releasing pressure, significantly increasing the risk of explosions, leaks, and other safety accidents caused by excessive internal pressure. Utility Model Content
[0003] In view of this, the present invention aims to provide a cover plate assembly to improve the electrolyte injection efficiency and pressure relief efficiency of the battery.
[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A cover plate assembly includes a cover plate body through which an electrode post passes, and a lower plastic sandwiched between the cover plate body and the electrode post; The cover plate body is provided with injection holes and explosion-proof valve mounting holes arranged at intervals along the first direction. The lower plastic part protrudes to the side away from the cover plate body to form a cavity. The cavity includes a first cavity and a second cavity that are connected to each other. A first through hole is provided at the bottom of the first cavity, and a second through hole is provided at the bottom of the second cavity. At least a portion of the first cavity is located directly below the explosion-proof valve mounting hole, and at least a portion of the second cavity is located directly below the injection hole, and the electrolyte injected into the second cavity through the injection hole can be discharged through the second through hole and the first through hole.
[0005] Furthermore, in the axial direction of the injection hole, the second through hole is staggered from the injection hole.
[0006] Furthermore, the lower plastic includes a main board attached to the cover plate body, a base plate arranged parallel to the main board, and an annular side plate connecting the base plate and the main board; The cavity is formed by the bottom plate and the annular side plate, and the first through hole and the second through hole are both provided on the bottom plate.
[0007] Furthermore, in the first direction, a third through hole is provided on the side wall of the first cavity facing the second cavity; A baffle is provided on the bottom wall of the first cavity, and the baffle is positioned directly opposite the communication opening between the first cavity and the second cavity.
[0008] Furthermore, the baffle is connected between the two side walls of the first cavity in the second direction, and divides the first cavity into two parts; The baffle has a recessed notch at the end away from the bottom plate, and the notch connects the two parts of the first cavity.
[0009] Furthermore, a fourth through hole is provided on the side wall where the first cavity connects to the second cavity; Both the third through hole and the fourth through hole include a first portion extending along the height direction of the annular side plate, and a second portion disposed on the main board.
[0010] Furthermore, the lower plastic body is provided with a fifth through hole located at one end of the second cavity near the cover plate body; The fifth through hole is located at the connection between the main board and the annular side plate.
[0011] Furthermore, the cover plate body is elongated, the lower plastic is conformally formed to the cover plate body, and the injection hole and the explosion-proof valve mounting hole are spaced apart along the length direction of the cover plate body; The first cavity is a long strip extending along the width direction of the cover plate body, and the second cavity is a long strip extending along the length direction of the cover plate body.
[0012] Compared with the prior art, this utility model has the following advantages: (1) The cover plate assembly of this utility model has a first cavity and a second cavity connected to each other on the lower plastic, a first through hole at the bottom of the first cavity, and a second through hole at the bottom of the second cavity. Therefore, during electrolyte injection, the electrolyte injected into the second cavity can be simultaneously injected into the casing through the first and second through holes, which improves the injection efficiency and effectively avoids localized liquid accumulation. Simultaneously, during pressure relief, internal gas can be quickly discharged through both the first and second through holes, facilitating rapid pressure relief and effectively ensuring the safety of the battery.
[0013] (2) By staggering the second through hole from the injection hole in the axial direction of the injection hole, the electrolyte can be effectively prevented from directly entering the electrode group through the second through hole, which would cause the injection pressure to directly impact the electrode group, resulting in electrode group damage and cell short circuit.
[0014] (3) By making the lower plastic include the main board, the base plate and the annular side plate, the overall structural rigidity of the lower plastic can be improved, and the base plate is set parallel to the main board. The first through hole and the second through hole are both set on the base plate. Thus, it can be further ensured that the electrolyte is injected into the battery pack housing through the first through hole and the second through hole at the same time, which is conducive to improving the injection speed.
[0015] (4) By setting a third through hole on the side wall of the first cavity, the pressure relief efficiency can be further improved. The baffle set on the first cavity, which is directly opposite the communication port between the first cavity and the second cavity, can prevent the electrolyte from directly entering the battery pack housing through the third through hole, thus preventing the injection pressure from directly impacting the electrode assembly. At the same time, the third through hole and the baffle work together to make the electrolyte first diffuse laterally and then flow vertically in the first cavity, delaying the time for the liquid to reach the first through hole, which can further reduce the impact on the electrode assembly.
[0016] (5) By connecting the baffle between the two side walls of the first cavity and setting a notch at the top of the baffle to connect the two parts, not only can the structural strength of the first cavity be improved, but also when there is a lot of electrolyte, it can enter the other part through the notch and inject the electrolyte through the second through hole in the other part at the same time, which can further improve the injection efficiency.
[0017] (6) By making the third through hole and the fourth through hole both include a first part extending along the height direction of the annular side plate and a second part on the main plate, the third through hole and the fourth through hole can have a large opening area, which is conducive to rapid liquid injection and pressure relief.
[0018] (7) By setting a fifth through hole on the lower plastic at the connection between the main board and the annular side plate, the electrolyte can be discharged through the fifth through hole during liquid injection, thereby improving the uniformity of electrolyte distribution in the cavity; while during pressure relief, the gas in the edge area can quickly enter the cavity through the fifth through hole, avoiding pressure imbalance caused by gas stagnation at the edge, which is conducive to improving the overall pressure relief efficiency.
[0019] (8) The first cavity is designed as a long strip extending along the width direction. During liquid injection, the electrolyte enters the second cavity through the injection hole and diffuses along the width direction through the long strip first cavity, covering the entire area below the cover plate, which can effectively avoid uneven local liquid injection. During depressurization, the long strip first cavity can collect the gas on both sides of the width direction at the same time, and then discharge it through the explosion-proof valve, which can improve the depressurization efficiency. The second cavity extends along the length direction of the cover plate body as a long strip. During liquid injection, the electrolyte enters the long strip second cavity through the injection hole and diffuses along the length direction, covering the entire area below the cover plate.
[0020] This utility model also proposes a battery, including a battery housing containing an electrode assembly, and the battery further includes a cover plate assembly as described above disposed on the battery housing.
[0021] Furthermore, the bottom wall of the cavity abuts against the electrode assembly.
[0022] The battery described in this utility model, by setting the cover plate assembly as described above, can improve the liquid injection efficiency and effectively avoid local liquid accumulation. At the same time, it can also facilitate rapid pressure release during depressurization, which can effectively ensure the safety of battery use.
[0023] In addition, placing the bottom wall of the cavity against the electrode assembly can improve the structural stability of the battery. Attached Figure Description
[0024] 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: Figure 1 This is a schematic diagram of the cover plate assembly described in an embodiment of the present utility model; Figure 2 This is a structural schematic diagram of the cover plate assembly described in an embodiment of the present utility model from another perspective; Figure 3 for Figure 2 Sectional view of line AA in the middle; Figure 4 These are exploded views of the cover plate assembly described in the embodiments of this utility model; Figure 5 This is a schematic diagram of the lower plastic material as described in an embodiment of the present invention from a first-view perspective; Figure 6 This is a schematic diagram of the lower plastic material described in an embodiment of the present invention from a second perspective; Figure 7 This is a schematic diagram of the lower plastic material as described in an embodiment of the present invention from a third-person perspective; Figure 8 This is a schematic diagram of the lower plastic material as described in an embodiment of the present invention from a fourth perspective.
[0025] Explanation of reference numerals in the attached figures: 1. Cover plate body; 2. Lower plastic; 3. Terminal post; 4. Explosion-proof valve; 5. Patch; 6. Upper plastic; 7. Seal; M. Injection hole; N. Explosion-proof valve mounting hole; P. Second chamber; Q. First chamber; 201. Main board; 202. Base plate; 203. Annular side plate; 204. Baffle; 205. First through hole; 206. Third through hole; 207. Fourth through hole; 208. Second through hole; 209. Fifth through hole; 2010. Via. Detailed Implementation
[0026] To make the technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0028] Furthermore, 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. 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.
[0029] 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.
[0030] In this utility model, 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 utility model. 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.
[0031] The present invention 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.
[0032] An embodiment of the first aspect of this utility model provides a cover plate assembly to improve injection efficiency and pressure relief efficiency.
[0033] In existing technologies, the liquid flow path during battery filling is singular, which easily leads to localized liquid accumulation near the filling hole M, resulting in a slower filling speed or even incomplete liquid filling. Furthermore, when gas is generated inside the battery, gas venting is often impaired, preventing the explosion-proof valve 4 from effectively and promptly releasing pressure, thus increasing the battery's safety risks.
[0034] In view of this, in order to overcome the shortcomings of the prior art, the cover plate assembly of this embodiment combines... Figures 1 to 4 As shown, the overall design includes a cover plate body 1 through which the pole post 3 is inserted, and a lower plastic 2 sandwiched between the cover plate body 1 and the pole post 3.
[0035] The cover plate body 1 is provided with injection holes M and explosion-proof valve mounting holes N arranged at intervals along the first direction. The lower plastic 2 protrudes to the side away from the cover plate body 1 to form a cavity. The cavity includes a first cavity Q and a second cavity P that are connected. A first through hole 205 is provided at the bottom of the first cavity Q, and a second through hole 208 is provided at the bottom of the second cavity P.
[0036] At least a portion of the first cavity Q is located directly below the explosion-proof valve mounting hole N, and at least a portion of the second cavity P is located directly below the injection hole M. The electrolyte injected through the injection hole M can be discharged through the second through hole 208 and the first through hole 205.
[0037] Therefore, by providing a connected first cavity Q and a second cavity P on the lower plastic 2, and by providing a first through hole 205 at the bottom of the first cavity Q and a second through hole 208 at the bottom of the second cavity P, electrolyte can be injected into the casing simultaneously through the first through hole 205 and the second through hole 208 during electrolyte injection, thereby improving injection efficiency and effectively preventing localized liquid accumulation. Simultaneously, during pressure relief, internal gas can be rapidly discharged through both the first through hole 205 and the second through hole 208, facilitating rapid pressure relief and ensuring battery safety.
[0038] Based on the above overview, specifically, as an exemplary implementation, the cover plate assembly of this embodiment still refers to... Figures 1 to 4As shown, the cover assembly typically includes, in addition to the cover body 1, pole 3, and lower plastic 2, an upper plastic 6 disposed between the pole 3 and the other side of the cover body 1, a sealing element 7 disposed between the cover body 1 and the pole 3, an explosion-proof valve 4 disposed in the explosion-proof valve mounting hole N, and a patch 5 disposed on one side of the explosion-proof valve 4. The upper plastic 6 and lower plastic 2 are made of insulating material and are used to achieve insulation between the cover body 1 and the pole 3. Furthermore, the specific structure of the pole 3, the installation method of the pole 3, lower plastic 2, explosion-proof valve 4, and patch 5 on the cover body 1, and the structure of the upper plastic 6 and sealing element 7 can all refer to existing structures; this embodiment does not make any improvements.
[0039] Continue to combine Figures 1 to 4 As shown, in some exemplary embodiments, the cross-sectional area of the first cavity Q is larger than that of the explosion-proof valve mounting hole N, such that a portion of the first cavity Q is located directly below the explosion-proof valve mounting hole N. Simultaneously, the cross-sectional area of the second cavity P is larger than that of the injection hole M, such that a portion of the second cavity P is located directly below the injection hole M.
[0040] In some exemplary embodiments, the second through hole 208 is staggered from the injection hole M in the axial direction. This effectively prevents electrolyte from directly entering the electrode assembly through the second through hole 208, which could cause the injection pressure to surge directly onto the electrode assembly, resulting in electrode assembly damage and cell short circuits. Furthermore, it effectively prevents the extraction of welding slag and other contaminants from the battery during helium testing.
[0041] In practical implementation, multiple second through holes 208 can be arranged at intervals. To avoid stress concentration, the second through holes 208 can be circular or elliptical. Furthermore, the projection of each second through hole 208 onto the axial direction of the injection hole M does not overlap with the injection hole M, thus achieving a staggered arrangement of the two along the axial direction of the injection hole M. This prevents the electrolyte from directly entering the battery pack through the second through holes 208 and directly impacting the electrode assembly.
[0042] Combination Figures 5 to 8 As shown, in some exemplary embodiments, the lower plastic 2 includes a main plate 201 attached to the cover plate body 1, a base plate 202 disposed parallel to the main plate 201, and an annular side plate 203 connecting the base plate 202 and the main plate 201. Furthermore, the cavity is formed by the base plate 202 and the annular side plate 203, and both the first through hole 205 and the second through hole 208 are provided on the base plate 202.
[0043] By including the main board 201, the base plate 202, and the annular side plate 203 in the lower plastic 2, the overall structural rigidity of the lower plastic 2 can be improved. Furthermore, the base plate 202 is arranged parallel to the main board 201, and both the first through hole 205 and the second through hole 208 are located on the base plate 202. This allows the electrolyte to be injected into the battery pack housing simultaneously through the first through hole 205 and the second through hole 208, thus improving the injection speed. Compared to the prior art, where the electrolyte can only be injected into the battery through the cavity near the injection hole M, this significantly improves the injection efficiency.
[0044] In specific implementation, such as Figure 5 As shown, the main board 201 smoothly transitions to the annular side plate 203 to reduce stress concentration. The main board 201 has through holes 2010 located on the left and right sides of the cavity, through which the electrode post 3 passes. Furthermore, protruding portions extending away from the cover plate body 1 are formed at both ends of the electrode post 3, and grooves are formed within these protruding portions. When the cover plate assembly is applied to the battery, the protruding portions can abut against the electrode assembly to improve the battery's structural stability. To further improve performance, multiple reinforcing plates are spaced apart within the grooves to enhance the structural strength of the protruding portions, thereby improving the secure contact with the electrode assembly.
[0045] In some exemplary embodiments, in the first direction, a third through hole 206 is provided on the side wall of the first cavity Q facing the second cavity P, and a baffle 204 is provided on the bottom wall of the first cavity Q, which is positioned opposite the communication port between the first cavity Q and the second cavity P. This further improves the pressure relief efficiency. The baffle 204 positioned on the first cavity opposite the communication port between the first and second cavities prevents electrolyte from directly entering the battery pack housing through the third through hole 206, thus preventing the injection pressure from directly impacting the electrode assembly. Simultaneously, the cooperation of the third through hole 206 and the baffle 204 allows the electrolyte to first diffuse laterally and then flow vertically within the first cavity Q, delaying the time it takes for the liquid to reach the first through hole 205, further reducing the impact on the electrode assembly.
[0046] In specific implementation, for example, it can be like this Figure 5 and Figure 7 As shown, baffle 204 connects between the two side walls of the first cavity Q in the second direction, dividing the first cavity Q into two parts. Furthermore, the end of baffle 204 away from the bottom plate 202 has a recessed notch that connects the two parts of the first cavity Q. This design not only improves the structural strength of the first cavity Q, but also allows electrolyte to enter the other part through the notch when there is a large amount, and simultaneously inject electrolyte through the second port in the other part, further improving the injection efficiency.
[0047] In addition, the third through hole 206 can be provided as a plurality of spaced-apart holes to further improve the injection efficiency and pressure relief efficiency. Furthermore, the first through hole 205 is provided in both parts of the first cavity Q, and the first through hole 205 is provided as a plurality of spaced-apart holes along the length direction of the baffle 204 to further improve the injection efficiency and pressure relief efficiency.
[0048] like Figure 5 As shown, in some exemplary embodiments, reinforcing ribs arranged intersecting with the baffle 204 can be provided at both ends of the first cavity Q to further improve the structural strength of the first cavity Q, thereby facilitating the abutment effect of the counter-electrode group. It should be noted that, in addition to... Figure 5 As shown, only one baffle 204 and one reinforcing rib are provided, but multiple baffles 204 and multiple reinforcing ribs can also be provided.
[0049] In some exemplary embodiments, a fourth through hole 207 is provided on the sidewall connecting the first cavity Q and the second cavity P. Both the third through hole 206 and the fourth through hole 207 include a first portion extending along the height direction of the annular side plate 203 and a second portion disposed on the main plate 201. Therefore, by providing the fourth through hole 207, and ensuring that both the third through hole 206 and the fourth through hole 207 include a first portion extending along the height direction of the annular side plate 203 and a second portion on the main plate 201, the third through hole 206 and the fourth through hole 207 can have a large opening area, facilitating rapid liquid injection and pressure relief.
[0050] In specific implementation, combined with Figure 5 As shown in Figure 7, for example, the structures of the third through hole 206 and the fourth through hole 207 can be made identical to facilitate manufacturing. Furthermore, multiple fourth through holes 207 are also spaced along the length of the baffle 204 to further improve injection and depressurization efficiency. Additionally, given the large opening areas of the third through hole 206 and the fourth through hole 207, the edge of the second portion on the main board 201 is a smoothly rounded arc to reduce stress concentration.
[0051] In some exemplary embodiments, the lower plastic 2 is provided with a fifth through hole 209 located at the end of the second cavity P near the cover plate body 1. This fifth through hole 209 is located at the connection between the main plate 201 and the annular side plate 203. By providing the fifth through hole 209 on the lower plastic 2 at the connection between the main plate 201 and the annular side plate 203, during liquid injection, the electrolyte can be dispersed through the fifth through hole 209, improving the uniformity of electrolyte distribution within the cavity. During pressure relief, gas in the edge region can quickly enter the cavity through the fifth through hole 209, avoiding pressure imbalance caused by gas stagnation at the edges and improving overall pressure relief efficiency.
[0052] In specific implementation, such as Figure 5 As shown, for example, the fifth through hole 209 can be provided in multiple spaced intervals along the edge of the second cavity P to further improve liquid injection. Furthermore, for ease of manufacturing, the projection of the fifth through hole 209 in the thickness direction of the main board 201 is rectangular. It should be noted that the shape of the fifth through hole 209, in addition to the example shown... Figure 5 As shown, it can also be set to a semi-circle or other structures.
[0053] In some exemplary embodiments, the cover body 1 is elongated, and the lower plastic 2 is conformally disposed to the cover body 1. The first direction is aligned with the length direction of the cover body 1 and the lower plastic 2, while the second direction is aligned with the width direction of the cover body 1 and the lower plastic 2. Furthermore, the injection hole M and the explosion-proof valve mounting hole N are spaced apart along the length direction of the cover body 1. Additionally, the first cavity Q is an elongated shape extending along the width direction of the cover body 1, and the second cavity P is an elongated shape extending along the length direction of the cover body 1.
[0054] Here, by designing both the cover body 1 and the lower plastic 2 as elongated, conformal shapes, with the injection hole M and the explosion-proof valve mounting hole N spaced apart along the length, the elongated cover can extend along the cell arrangement direction in the battery pack, reducing lateral space occupation and facilitating dense stacking. Furthermore, by designing the first cavity Q as an elongated shape extending along the width direction, during electrolyte injection, the electrolyte enters the second cavity P from the injection hole M at one end along the length direction and diffuses into the width direction through the elongated first cavity Q, covering the entire area below the cover, effectively preventing uneven local electrolyte injection. During depressurization, the elongated first cavity Q can simultaneously collect gas from both sides along the width direction and then discharge it through the explosion-proof valve 4, improving depressurization efficiency.
[0055] Furthermore, the second cavity P extends into a long strip along the length of the cover plate body 1. During electrolyte injection, after the electrolyte enters the long strip-shaped second cavity P through the injection hole M, it can diffuse along its length, covering the entire area below the cover plate, thus avoiding the problem of concentration at the center of the traditional circular cavity. At the same time, the slender structure of the long strip-shaped cavity reduces the flow resistance of the electrolyte, which is beneficial for increasing the injection speed, while reducing bubbles or turbulence caused by excessive flow rate.
[0056] In specific implementation, for example, Figure 5As shown, to avoid stress concentration, the second cavity P is approximately located in the middle of the length of the first cavity Q, with the end furthest from the first cavity Q being semi-circular. The aforementioned injection hole M is located directly above this semi-circular portion, and the fifth through hole 209 is also located along the edge of this semi-circular portion. Therefore, even when the injection speed is fast and the electrolyte in the first cavity Q is abundant, the electrolyte can still flow out through the fifth through hole 209, ensuring injection efficiency and preventing direct impact on the electrode assembly. Furthermore, the second through hole 208 is a circular hole, specifically multiple holes spaced apart along the length of the first cavity Q, to improve the uniformity of the injection.
[0057] It should be noted that the number, shape, and arrangement of the second through holes 208 can be adjusted according to actual needs.
[0058] 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 8 As shown, it also includes a cover body 1 and a lower plastic 2.
[0059] The cover plate body 1 and the lower plastic 2 are both rectangular. The first cavity Q is a long strip extending along the width direction of the lower plastic 2, and the second cavity P is a long strip extending along the length direction of the plastic. The second cavity P is roughly located in the middle of the length direction of the first cavity Q, and the end away from the first cavity Q is semi-circular.
[0060] The lower plastic 2 includes a main plate 201 attached to the cover plate body 1, a base plate 202 arranged parallel to the main plate 201, and an annular side plate 203 connecting the base plate 202 and the cover plate body 1. The cavity is formed by the base plate 202 and the annular side plate 203. The first through hole 205 and the second through hole 208 are both provided on the base plate 202.
[0061] The first cavity Q has a baffle 204 extending along its length, positioned directly opposite the connection point between the first cavity Q and the second cavity P. The baffle 204 has a notch at its top and first through holes 205 on both sides. These first through holes 205 are multiple and spaced apart along the length of the baffle 204, and are circular. Additionally, the second cavity P has multiple second through holes 208 extending along its length. These second through holes 208 are arranged in two rows along the width of the second cavity P, and are also circular, with a diameter smaller than that of the first through holes 205.
[0062] The first cavity Q is provided with a fourth through hole 207 on the side wall connected to the second cavity P. The third through hole 206 and the fourth through hole 207 are multiple through holes spaced apart along the length direction of the second cavity P. Each through hole includes a first part extending along the height direction of the annular side plate 203 and a second part provided on the main board 201.
[0063] The lower plastic 2 is provided with a fifth through hole 209 located at the opening end of the first cavity Q. The fifth through hole 209 is located at the semi-circular part of the first cavity Q and is located at the connection between the main board 201 and the annular side plate 203.
[0064] In the preferred embodiments of the above cover plate assembly, the specific configuration and arrangement of the cover plate body 1 and the lower plastic 2 can still be found in the descriptions of the above exemplary embodiments.
[0065] The cover plate assembly of this embodiment adopts the above design. During electrolyte injection, electrolyte can be injected into the casing simultaneously through the first through hole 205 and the second through hole 208, which improves the injection efficiency and effectively avoids localized liquid accumulation. At the same time, during depressurization, internal gas can be quickly discharged simultaneously through the first through hole 205 and the second through hole 208, which facilitates rapid depressurization and ensures the safety of battery use.
[0066] A second aspect of the present invention provides a battery including a battery housing containing an electrode assembly, and the battery further including a cover plate assembly as described above disposed on the battery housing.
[0067] At this time, still Figures 1 to 4 Taking the illustrated cover assembly as an example, in a specific application, the bottom wall of the cavity abuts against the electrode assembly. This improves the structural stability of the battery.
[0068] The battery in this embodiment, by setting the cover plate assembly as described above, can improve the liquid injection efficiency and effectively avoid local liquid accumulation. At the same time, it can also facilitate rapid pressure release during depressurization, thereby ensuring the safety of battery use.
[0069] The above are merely some embodiments of this utility model and are not intended to limit the utility model. 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 utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A cover plate assembly, characterized in that: It includes a cover plate body through which the pole is inserted, and a lower plastic sandwiched between the cover plate body and the pole; The cover plate body is provided with injection holes and explosion-proof valve mounting holes arranged at intervals along the first direction. The lower plastic part protrudes to the side away from the cover plate body to form a cavity. The cavity includes a first cavity and a second cavity that are connected to each other. A first through hole is provided at the bottom of the first cavity, and a second through hole is provided at the bottom of the second cavity. At least a portion of the first cavity is located directly below the explosion-proof valve mounting hole, and at least a portion of the second cavity is located directly below the injection hole, and the electrolyte injected into the second cavity through the injection hole can be discharged through the second through hole and the first through hole.
2. The cover plate assembly according to claim 1, characterized in that: The second through hole is staggered from the injection hole in the axial direction of the injection hole.
3. The cover plate assembly according to claim 1, characterized in that: The lower plastic includes a main board attached to the cover plate body, a base plate arranged parallel to the main board, and an annular side plate connected between the base plate and the main board; The cavity is formed by the bottom plate and the annular side plate, and the first through hole and the second through hole are both provided on the bottom plate.
4. The cover plate assembly according to claim 3, characterized in that: In the first direction, a third through hole is provided on the side wall of the first cavity facing the second cavity; A baffle is provided on the bottom wall of the first cavity, and the baffle is positioned directly opposite the communication opening between the first cavity and the second cavity.
5. The cover plate assembly according to claim 4, characterized in that: The baffle is connected between the two side walls of the first cavity in the second direction and divides the first cavity into two parts; The baffle has a recessed notch at the end away from the bottom plate, and the notch connects the two parts of the first cavity.
6. The cover plate assembly according to claim 4, characterized in that: A fourth through hole is provided on the side wall connecting the first cavity and the second cavity; Both the third through hole and the fourth through hole include a first portion extending along the height direction of the annular side plate, and a second portion disposed on the main board.
7. The cover plate assembly according to claim 3, characterized in that: The lower plastic body is provided with a fifth through hole located at one end of the second cavity near the cover plate body; The fifth through hole is located at the connection between the main board and the annular side plate.
8. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The cover plate body is elongated, the lower plastic is conformally formed to the cover plate body, and the injection hole and the explosion-proof valve mounting hole are spaced apart along the length of the cover plate body; The first cavity is a long strip extending along the width direction of the cover plate body, and the second cavity is a long strip extending along the length direction of the cover plate body.
9. A battery comprising a battery casing housing an electrode assembly, characterized in that: The battery further includes a cover assembly according to any one of claims 1 to 8 disposed on the battery housing.
10. The battery according to claim 9, characterized in that: The bottom wall of the cavity abuts against the electrode assembly.