Battery cell cover plate and battery cell

Abstract

This invention belongs to the field of battery technology, specifically disclosing a cell cover and a cell. The cell cover includes a first plastic part, a sealing cover, a second plastic part, and a connector stacked sequentially. The sealing cover includes a first protrusion on the cover body, and the first plastic part includes a second protrusion on the first plastic part body. The current-conducting terminal includes a terminal base plate and a terminal body. The terminal base plate is located on the side of the first plastic part body near the cell electrode assembly. One end of the terminal body is connected to the terminal base plate, and the other end of the terminal body passes through the first plastic part, the sealing cover, and the second plastic part before connecting to the connector. The end of the terminal body away from the cell electrode assembly and the end face of the connector facing away from the cell electrode assembly are both lower than the end face of the first protrusion facing away from the cell electrode assembly, thus protecting the connector and the current-conducting terminal through the first protrusion. Simultaneously, the first and second protrusions increase the assembly space of the cell electrode assembly, increasing its volume. This invention also provides a cell, including the aforementioned cell cover.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cell cover plate and a cell. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety. Among these, the battery cell is the core component of a lithium-ion battery, and its structural design is crucial to its safety.

[0003] Currently, the cell cover of existing battery cells is generally designed as a planar structure, with the riveting blocks and upper plastic parts protruding from the end face of the aluminum plate. This occupies external space during battery module assembly, affecting the battery pack assembly rate. Furthermore, the protruding riveting blocks and upper plastic parts offer poor protection, frequently resulting in bumps and scratches during transportation and assembly processes, leading to performance, safety, and appearance defects in the cells and batteries. Additionally, the ends of the cell electrode assemblies in existing battery cells are typically designed as planar structures. If the support surface between the cell electrode assemblies and the cell cover is unbalanced, it can easily cause electrode damage and excessive movement during the cell cover's insertion and fixing of the cell electrode assemblies into the casing, resulting in assembly defects. Summary of the Invention

[0004] The purpose of this invention is to provide a cell cover and a cell that can provide good protection for connectors and current-conducting terminals, reduce the risk of collisions, and ensure high safety. At the same time, it can apply pressure evenly to the cell electrode assembly to avoid damage to the cell electrode assembly and achieve a high assembly yield.

[0005] To achieve this objective, the present invention adopts the following technical solution: On one hand, the present invention provides a battery cell cover plate, comprising: The encapsulation cover includes a cover plate body, on which a first protrusion is provided, the first protrusion extending along a first direction away from the cell electrode group; A first plastic component is provided, wherein the encapsulation cover is disposed on the side of the component close to the battery cell electrode assembly along a first direction. The first plastic component includes a first plastic component body, and a second protrusion is provided on the first plastic component body. The second protrusion extends away from the battery cell electrode assembly along the first direction, and the end face of the first plastic component body facing away from the battery cell electrode assembly is in contact with the end face of the cover plate body facing the battery cell electrode assembly. The surface of the second protrusion facing away from the battery cell electrode assembly is in contact with the surface of the first protrusion facing the battery cell electrode assembly. The second plastic component is disposed on the side of the encapsulation cover away from the cell electrode assembly along the first direction; A connector is disposed on the side of the second plastic part away from the battery cell electrode assembly along the first direction; The current-conducting terminal includes a base plate and a post body. The base plate is located on the side of the first plastic part body close to the cell electrode assembly along a first direction. One end of the post body is connected to the base plate, and the other end of the post body passes through the first plastic part, the encapsulation cover, and the second plastic part and is connected to the connector. The end of the post body away from the cell electrode assembly and the end face of the connector away from the cell electrode assembly are both lower than the end face of the first convex bulge away from the cell electrode assembly.

[0006] Optionally, the encapsulation cover includes a first side plate, which is connected to the cover body in the circumferential direction and extends toward the cell electrode group. The cover body and the first side plate form a first receiving cavity, and the side of the first protrusion facing the cell electrode group forms a second receiving cavity. The second receiving cavity communicates with the first receiving cavity. The first plastic part includes a second side plate, which is connected to the body of the first plastic part in the circumferential direction and extends toward the battery cell electrode group. The end faces of the second side plate and the first side plate that are close to each other are in contact with each other. The body of the first plastic part and the second side plate form a third accommodating cavity. The side of the second protrusion facing the battery cell electrode group forms a fourth accommodating cavity. The fourth accommodating cavity is in communication with the third accommodating cavity.

[0007] Optionally, the electrode post includes a plate body, a first post, and a second post. The first post is connected to the end of the plate body away from the battery cell electrode assembly, and the second post is connected to the end of the plate body near the battery cell electrode assembly. The bottom plate of the electrode post is provided with a mounting groove on the side near the cover plate body. The mounting groove is used to accommodate the plate body. A through hole is provided on the bottom wall of the mounting groove. The second post passes through the through hole and is welded to the hole wall. The first post passes through the first plastic part body, the cover plate body, the second plastic part, and the connector in sequence and is riveted to the connector.

[0008] Optionally, the cover plate body is provided with a first through hole, the first plastic part body is provided with a second through hole, the second plastic part is provided with a third through hole, and the connector is provided with a fourth through hole. The first through hole, the second through hole, the third through hole, and the fourth through hole are all used to allow the first column to pass through, and the through hole is used to allow the second column to pass through.

[0009] Optionally, the cell cover includes a sealing element, which is sleeved on the first column and sandwiched between the first column and the cover body. The sealing element is used to seal the gap between the first column and the cover body.

[0010] Optionally, the first convex bulge and the second convex bulge are provided in pairs, with the two first convex bulges spaced apart at both ends of the cover plate body along the second direction, and the two second convex bulges spaced apart at both ends of the first plastic body along the second direction.

[0011] Optionally, the second plastic part includes a second plastic part body and a first extension. The second plastic part body is disposed between two adjacent first protrusions along the second direction. The first extension is located on the side of the first protrusion along the third direction and extends along the second direction. The middle part of the first extension is connected to the end of the second plastic part body along the third direction. The end of the first extension along the second direction is provided with the third through hole. The connector includes a connector body and a second extension. The connector body is disposed between two adjacent first protrusions along the second direction. The second extension is located on the side of the first protrusion along the third direction and extends along the second direction. The middle part of the second extension is connected to the end of the connector body along the third direction. The end of the second extension along the second direction is provided with the fourth through hole. The pole base plate includes a base plate body and a third extension. The base plate body is disposed between two adjacent second protrusions along the second direction. The third extension is located on the side of the second protrusion along the third direction and extends along the second direction. The middle part of the third extension is connected to the end of the base plate body along the third direction. The end of the third extension along the second direction is provided with the through hole.

[0012] Optionally, the second plastic part includes a limiting plate, which is disposed around the body of the second plastic part and the first extension. The limiting plate extends in a first direction away from the encapsulation cover. The limiting plate, the second plastic part body, and the first extension form a limiting space, and at least a portion of the connector is embedded in the limiting space.

[0013] Optionally, the two first side plates opposite each other along a third direction in the encapsulation cover are provided with a third protrusion. The two third protrusions protrude in opposite directions. The inner side of the third protrusion forms a fifth receiving cavity, and the fifth receiving cavity is in communication with the first receiving cavity. In the first plastic part, a fourth protrusion is provided on each of the two second side plates opposite to each other along a third direction. The two fourth protrusions protrude in opposite directions. The inner side of the fourth protrusion forms a sixth receiving cavity. The sixth receiving cavity is connected to the third receiving cavity. The end faces of the fourth protrusion and the third protrusion that are close to each other fit together.

[0014] On the other hand, the present invention provides a battery cell including the battery cell cover plate of any of the above embodiments.

[0015] The beneficial effects of this invention are as follows: This invention provides a battery cell cover plate, comprising a first plastic part, an encapsulation cover, a second plastic part, and a connector stacked sequentially along a first direction. A current-conducting terminal is disposed through the first plastic part, the encapsulation cover, the second plastic part, and the connector, and conducts the current generated by the battery cell electrode assembly through the current-conducting terminal. The encapsulation cover includes a first protrusion disposed on the cover plate body, and the first plastic part includes a second protrusion disposed on the first plastic part body, with the surfaces of the second protrusion and the first protrusion close to each other and abutting. The current-conducting terminal includes a base plate and a post body. The base plate is located on the side of the first plastic part body along the first direction close to the battery cell electrode assembly. One end of the post body is connected to the base plate, and the other end of the post body passes through the first plastic part, the encapsulation cover, and the second plastic part before connecting to the connector. The end of the electrode column furthest from the cell electrode assembly, and the end face of the connector facing away from the cell electrode assembly, are both lower than the end face of the first protrusion facing away from the cell electrode assembly. This allows the first protrusion to provide good protection for the connector and current-conducting terminals, preventing damage during manufacturing, improving the cell's safety performance, and ensuring a good appearance. Simultaneously, the presence of both the first and second protrusions increases the assembly space for the cell electrode assembly, thereby increasing the cell's energy density and resulting in a higher assembly ratio.

[0016] This invention also provides a battery cell, including the aforementioned battery cell cover. By employing a specially designed battery cell cover, damage to the battery cell electrode assembly during installation is prevented. The battery cell cover provides excellent positioning and support for the battery cell electrode assembly, ensuring a good fit between the battery cell electrode assembly and the battery cell cover. The supporting surfaces of the battery cell electrode assembly and the battery cell cover provide balanced support. Furthermore, the space utilization rate of the battery cell electrode assembly within the battery cell cover and battery cell housing is high, resulting in high capacity and a high assembly ratio for the battery cell. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0018] Figure 1 This is an exploded view of the battery cell cover plate provided in an embodiment of the present invention; Figure 2 This is an exploded view of the battery cell cover plate provided in an embodiment of the present invention from another perspective; Figure 3 This is a top view of the battery cell cover plate provided in an embodiment of the present invention; Figure 4 yes Figure 3 Sectional view of section I-I; Figure 5 yes Figure 4 Enlarged view of a section at point III; Figure 6 yes Figure 3 Sectional view of section II-II; Figure 7 yes Figure 6 Enlarged view of a section at point IV; Figure 8 This is a schematic diagram of the cell electrode assembly provided in an embodiment of the present invention; Figure 9 yes Figure 8 A magnified view of section V; Figure 10 This is an exploded view of the battery cell casing provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 12 This is a right view of the battery cell provided in an embodiment of the present invention; Figure 13 yes Figure 12 Sectional view of section VI-VI; Figure 14 yes Figure 13 A magnified view of section VII.

[0019] In the picture: 100. Cell cover plate; 110. Encapsulation cover; 111. Cover plate body; 1111. First through hole; 112. First protrusion; 1121. Second receiving cavity; 113. First side plate; 1131. First receiving cavity; 114. Third protrusion; 1141. Fifth receiving cavity; 120. First plastic part; 121. First plastic part body; 1211. Second through hole; 122. Second protrusion; 1221. Fourth receiving cavity; 123. Second side plate; 1231. Third receiving cavity; 124. Fourth protrusion; 1241. 130. Sixth accommodating cavity; 131. Second plastic part; 132. Second plastic part body; 133. First extension; 134. Third through hole; 135. Limiting plate; 146. Connector; 147. Connector body; 148. Second extension; 149. Fourth through hole; 150. Pole post base plate; 151. Base plate body; 152. Third extension; 1521. Mounting groove; 1522. Through hole; 160. Pole post; 161. Plate body; 162. First post; 163. Second post; 170. Sealing element; 200, Cell electrode assembly; 210, Electrode assembly body; 220, First boss; 221, Guide surface; 230, Second boss; 231, Circumvention notch; 240, Through groove; 241, Connecting part; 250, Electrode tab; 300, Cell housing; 310, First cylinder; 311, First partition; 312, Slot; 320, Second cylinder; 321, Second partition; 322, Snap protrusion; 400, Explosion-proof valve. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1-7 As shown, this embodiment provides a cell cover 100, which can accommodate irregularly shaped cell electrode assemblies 200 and cell housings 300. Through a special structural design, the cell cover 100 increases the assembly space of the cell electrode assemblies 200, thereby improving the energy density of the cell and achieving a high assembly ratio. Furthermore, it provides good protection for the connectors 140 and current-conducting terminals, preventing damage during the manufacturing process, improving the safety performance of the cell, and ensuring a good appearance. Simultaneously, the cell cover 100 can apply uniform pressure to the cell electrode assemblies 200, ensuring balanced force when the cell electrode assemblies 200 are inserted into the housing, reducing the risk of damage or fragmentation.

[0026] Specifically, the cell cover 100 includes an encapsulation cover 110, a first plastic part 120, a second plastic part 130, a connector 140, and a current-conducting terminal. The encapsulation cover 110 and the first plastic part 120 are stacked along a first direction, and the first plastic part 120 is disposed on the side of the encapsulation cover 110 close to the cell electrode assembly 200 along the first direction. The second plastic part 130 is disposed on the side of the encapsulation cover 110 away from the cell electrode assembly 200 along the first direction, and the connector 140 is disposed on the side of the second plastic part 130 away from the cell electrode assembly 200 along the first direction. The current-conducting terminal passes through the first plastic part 120, the encapsulation cover 110, the second plastic part 130, and the connector 140, and is fixed on the encapsulation cover 110, conducting the current generated by the cell electrode assembly 200 through the current-conducting terminal. The aforementioned first direction is the height direction of the cell cover 100, which is also... Figure 1 The X-axis direction is shown in the figure.

[0027] Optionally, the encapsulation cover 110 includes a cover plate body 111 and a first protrusion 112. The first protrusion 112 is disposed on the cover plate body 111 and extends in a first direction away from the cell electrode group 200. The first plastic part 120 includes a first plastic part body 121. The first plastic part body 121 is provided with a second protrusion 122. The second protrusion 122 extends in a first direction away from the cell electrode group 200. The end face of the first plastic part body 121 facing away from the cell electrode group 200 is attached to the end face of the cover plate body 111 facing the cell electrode group 200. The surface of the second protrusion 122 facing away from the cell electrode group 200 is attached to the surface of the first protrusion 112 facing the cell electrode group 200. The current-conducting terminal includes a base plate 150 and a pole body 160. The base plate 150 is located on the side of the first plastic body 121 close to the cell electrode group 200 along the first direction. One end of the pole body 160 is connected to the base plate 150, and the other end of the pole body 160 passes through the first plastic part 120, the encapsulation cover 110, and the second plastic part 130 and is connected to the connector 140. This achieves the fixation of the current-conducting terminal on the encapsulation cover 110. The first plastic part 120 insulates the encapsulation cover 110 from the current-conducting terminal and the cell electrode group 200, and the second plastic part 130 insulates the encapsulation cover 110 from the connector 140, ensuring the electrical safety of the cell. The end of the electrode post 160 away from the cell electrode group 200 and the end face of the connector 140 away from the cell electrode group 200 are both lower than the end face of the first protrusion 112 away from the cell electrode group 200. The first protrusion 112 can provide good protection for the connector 140 and the current-conducting terminal, avoid damage during the manufacturing process, improve the safety performance of the cell, and ensure the good appearance of the cell.

[0028] Optionally, in this embodiment, the first protrusion 112 and the second protrusion 122 are provided in pairs, with the two first protrusions 112 spaced apart at both ends of the cover body 111 along the second direction, and the two second protrusions 122 spaced apart at both ends of the first plastic body 121 along the second direction. The arrangement of the two first protrusions 112 and the two second protrusions 122 in the cell cover 100 provides a larger installation space for the first protrusion 220 in the cell electrode assembly 200 (see...). Figure 8This design helps improve the energy density and assembly ratio of individual cells. Furthermore, the connectors 140 of adjacent cells can be electrically connected via conductive busbars to form a battery module. The end face of the conductive busbar facing away from the connector 140 is also lower than the highest point of the first protrusion 112. Therefore, the first protrusion 220 effectively protects the electrode post 160, connector 140, second plastic part 130, and conductive busbar, preventing damage to these components during cell manufacturing. This improves the safety performance and structural strength of the cell, providing excellent protection. Damage is virtually nonexistent during transportation and assembly, resulting in safe cell performance and a good appearance. It also saves assembly space for the battery module, reducing the external space required for module assembly and increasing the module assembly rate.

[0029] Furthermore, the encapsulation cover 110 includes a first side plate 113, which is connected to the cover body 111 in the circumferential direction and extends toward the cell electrode group 200. The cover body 111 and the first side plate 113 form a first receiving cavity 1131. The first protrusion 112 forms a second receiving cavity 1121 on the side facing the cell electrode group 200. The second receiving cavity 1121 communicates with the first receiving cavity 1131. The first plastic part 120 includes a second side plate 123, which is connected to the first plastic part body 121 in the circumferential direction and extends toward the cell electrode group 200. The end faces of the second side plate 123 and the first side plate 113 that are close to each other are in contact with each other. The first plastic part body 121 and the second side plate 123 form a third accommodating cavity 1231. The second protrusion 122 forms a fourth accommodating cavity 1221 on the side facing the cell electrode group 200. The fourth accommodating cavity 1221 is connected to the third accommodating cavity 1231.

[0030] See Figure 4Along the first direction, the distance between the end face of the first protrusion 112 facing away from the cell electrode assembly 200 and the end face of the cover plate body 111 facing away from the cell electrode assembly 200 is H1, that is, the height of the first protrusion 112 along the first direction is H1, and the value of H1 is in the range of 15mm≤H1≤40mm. For example, the value of H1 can be 15mm, 20mm, 25mm, 30mm, 35mm or 40mm, etc. By limiting the value of H1 to the above range, the volume of the second accommodating cavity 1121 on the side of the first protrusion 112 facing the cell electrode assembly 200 is larger, and consequently the volume of the fourth accommodating cavity 1221 on the side of the second protrusion 122 facing the cell electrode assembly 200 in the first plastic part 120 is larger, which can increase the length of the cell electrode assembly 200 along the first direction to accommodate a larger volume of the cell electrode assembly 200, and the capacity improvement effect of the cell is obvious. Of course, the value of H1 should not be too large, otherwise the first protrusion 112 will not be easy to stamp and form, the processing yield will decrease, and when the height dimension of the first protrusion 112 along the first direction is too large, the stretching length of the first protrusion 112 during stamping will be too large, the wall thickness will be reduced more, which will weaken the structural strength of the encapsulation cover 110 and will not be conducive to improving the protection effect on the battery cell electrode group 200.

[0031] Optionally, the wall thickness of the encapsulation cover 110 at the first protrusion 112 is T2, and the value of T2 is in the range of 1.5mm ≤ T2 ≤ 3mm. For example, the value of T2 can be 1.5mm, 2.0mm, 2.5mm, or 3.0mm, etc. By limiting the value of T2 to the above range, it is ensured that the first protrusion 112 can be smoothly processed and formed with a high processing yield; at the same time, the wall thickness of the first protrusion 112 after stamping and stretching is large, and the structural strength is high enough to provide good protection for the battery cell electrode assembly 200, resulting in high safety.

[0032] Furthermore, along the first direction, the distance between the end face of the first side plate 113 near the cell electrode assembly 200 and the end face of the first protrusion 112 away from the cell electrode assembly 200 is H2, that is, the overall height of the encapsulation cover 110 along the first direction is H2, and the value range of H2 is: 35mm≤H2≤70mm. For example, the value of H2 can be 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm or 70mm, etc. By limiting the value of H2 to the above range, the volume of the first accommodating cavity 1131 formed by the cover plate body 111 and the first side plate 113 is larger, and consequently the volume of the third accommodating cavity 1231 formed by the first plastic part body 121 and the second side plate 123 in the first plastic part 120 is larger, which can accommodate a larger volume of cell electrode assembly 200, and has a good capacity-increasing effect on the cell. Of course, the value of H2 should not be too large, otherwise the first side plate 113 will not be easy to stamp and form, the processing yield will decrease, and when the first side plate 113 is too high, the stretching length of the first side plate 113 during stamping will be too large, the wall thickness of the first side plate 113 will be reduced a lot, which will weaken the structural strength of the encapsulation cover 110 and will not be conducive to improving the protection effect of the cell electrode group 200.

[0033] See Figure 8 and Figure 9 In this embodiment, the cell electrode assembly 200 includes an electrode assembly body 210 and four first protrusions 220. Each end of the electrode assembly body 210 along a first direction has two first protrusions 220. Two first protrusions 220 located at the same end of the electrode assembly body 210 are spaced apart and symmetrically arranged along a second direction. The first protrusions 220 are used to cooperate with the fourth receiving cavity 1221 on the first plastic part 120 in the cell cover plate 100. The end of the electrode assembly body 210 connected to the first protrusions 220 is located within the third receiving cavity 1231 (see [reference]). Figure 13 and Figure 14 The first protrusion 220 increases the volume of the cell electrode assembly 200, thereby increasing the cell capacity. Furthermore, the cooperation between the first protrusion 220 and the first plastic part 120 improves the positioning accuracy between the cell cover plate 100 and the cell electrode assembly 200, ensuring that the cell cover plate 100 provides uniform pressure to the cell electrode assembly 200 when pressing it into the casing. This prevents the cell electrode assembly 200 from fragmenting, ensuring a high assembly yield. Moreover, the cell electrode assembly 200 and cell cover plate 100 are less prone to shifting after assembly, maintaining a stable and reliable position. Optionally, the electrode assembly body 210 is formed by stacking multiple first substrates along a third direction. Each end of the first substrate along the first direction has two rectangular extensions, which are spaced apart along the second direction. The extensions on the multiple first substrates are stacked to form the aforementioned first protrusion 220. The extensions can be formed by cutting the substrate of the first substrate. The second direction mentioned above is the length direction of the cell cover plate 100, which is also... Figure 1 the Y-axis direction shown in; the third direction is the width direction of the battery cell cover plate 100, which is also Figure 1 the Z-axis direction shown in.

[0034] More preferably, a guiding surface 221 is provided at the edge of the first boss 220 of the battery cell electrode group 200 close to the battery cell cover plate 100. The guiding surface 221 can be an inclined plane or an arc surface. Through the setting of the guiding surface 221, the first boss 220 is easy to be assembled with the battery cell cover plate 100 and can be smoothly inserted into the fourth accommodating cavity 1221 of the first plastic part 120. Exemplarily, the guiding surface 221 can be provided at the edges of the two first bosses 220背离 each other along the second direction. Of course, in other embodiments, the guiding surface 221 can also be provided at each edge of the first boss 220 close to the battery cell cover plate 100.

[0035] Further, second bosses 230 are provided on each end face of the electrode group main body 210 oppositely arranged along the third direction. The second bosses 230 are formed by laminating a plurality of second substrates on the end face of the electrode group main body 210 along the third direction, and the two second bosses 230 are symmetrically arranged on both sides of the electrode group main body 210 along the third direction. Optionally, the four corners of the second substrate are cut to form a material-removing part. After a plurality of second substrates are laminated along the third direction, an avoidance notch 231 is formed at the material-removing part, that is, avoidance notches 231 are provided at the four corners of each second boss 230, and finally the second boss 230 forms a convex structure similar to the Chinese character '中'. Through the setting of the second boss 230, the volume of the battery cell electrode group 200 can be further increased, thereby improving the capacity of the battery cell. And the whole battery cell electrode group 200 adopts a completely symmetrical design scheme, which can reduce the process window during the assembly of the battery cell electrode group 200 with the battery cell cover plate 100 and the battery cell housing 300. There is no need to distinguish the two ends of the battery cell electrode group 200 along the first direction, and either end of the battery cell electrode group 200 can be smoothly assembled with the battery cell cover plate 100 and the battery cell housing 300, improving the process yield.

[0036] Continue to refer to Figures 1-3In the encapsulation cover 110, each of the two first side plates 113 facing each other along a third direction is provided with a third protrusion 114. The two third protrusions 114 protrude in opposite directions and form a fifth receiving cavity 1141 inside the third protrusions 1144. The fifth receiving cavity 1141 communicates with the first receiving cavity 1131. In the first plastic part 120, each of the two second side plates 123 facing each other along a third direction is provided with a fourth protrusion 124. The two fourth protrusions 124 protrude in opposite directions and form a sixth receiving cavity 1241 inside the fourth protrusions 1244. The sixth receiving cavity 1241 communicates with the third receiving cavity 1231. The end faces of the fourth protrusions 124 and the third protrusions 114 that are close to each other are in contact with each other. The end of the second protrusion 230 in the cell electrode assembly 200 along the first direction is housed in the sixth accommodating cavity 1241 of the first plastic part 120. The installation space for the second protrusion 230 of the cell electrode assembly 200 is provided by the setting of the third protrusion 114 in the encapsulation cover 110 and the setting of the fourth protrusion 124 in the first plastic part 120, which further increases the volume of the cell electrode assembly 200 and improves the energy density and assembly ratio of the cell.

[0037] Along the third direction, the distance between the end faces of the two third protrusions 114 facing away from each other is B1, and the width of the cover body 111 along the third direction is B2. The relationship between B1 and B2 satisfies: 16mm ≤ B1 - B2 ≤ 60mm. For example, the value of B1 - B2 can be 16mm, 20mm, 30mm, 40mm, 50mm, or 60mm, etc. By limiting the value of B1 - B2 to the above range, the volume of the fifth accommodating cavity 1141 formed inside the third protrusion 114 is large enough, and thus the volume of the sixth accommodating cavity 1241 of the first plastic part 120 that cooperates with the encapsulation cover 110 is large enough to accommodate the second protrusion 230 of the larger volume of the cell electrode assembly 200. The capacity of the cell is increased significantly, and the third protrusion 114 is easy to process and form with a high forming yield. Moreover, the wall thickness of the third protrusion 114 after stretching is still large, and the mechanical strength is high, which can provide good protection for the cell electrode assembly 200. If the value of B1-B2 is too small, the second protrusion 230 of the cell electrode assembly 200 will be small, which is not conducive to improving the cell capacity and assembly ratio. If the value of B1-B2 is too large, the processing difficulty of the third protrusion 114 will increase, the yield of stamping will decrease, and the strength of the encapsulation cover 110 after stretching will decrease, reducing the protective capability. Optionally, the value range of B2 is: 70mm≤B2≤150mm. For example, the value of B2 can be 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, or 150mm, etc. The value of B1 can be calculated based on the above range of B1-B2.

[0038] See also Figure 4Along a third direction, the width of the first convex 112 is W1, and the relationship between W1 and B1 satisfies: 0.33 ≤ W1 / B1 ≤ 0.6. For example, the value of W1 / B1 can be 0.33, 0.4, 0.5, or 0.6, etc. By limiting the value of W1 / B1 to the above range, the width of the first convex 112 is larger, thereby increasing the volume of the cell electrode assembly 200 and significantly improving the cell capacity. Moreover, the first convex 112 is easy to stamp and form, with a high processing yield. The wall thickness of the first convex 112 is not significantly reduced, and the structural strength of the encapsulation cover 110 remains high, providing good protection for the cell electrode assembly 200.

[0039] See Figure 3 and Figure 6 Along the second direction, the distance between the end faces of the two first protrusions 112 that are close to each other on one side is L2, and the width of the cover body 111 is A. The relationship between L2 and A satisfies: 0.2 ≤ L2 / A ≤ 0.35. For example, the value of L2 / A can be 0.20, 0.25, 0.30, or 0.35, etc. By limiting the value of L2 / A within the above range, a suitable installation space is left between the two adjacent first protrusions 112 to facilitate assembly with the second plastic part 130 and the connector 140. At the same time, it also ensures that the volume of the second accommodating cavity 1121 inside the first protrusion 112 is large enough, resulting in a significant increase in the capacity of the cell electrode group 200. Optionally, the value of A is in the range of: 120mm ≤ A ≤ 460mm. For example, the value of A can be 120mm, 150mm, 160mm, 180mm, 200mm, 300mm, 400mm, or 460mm, etc.

[0040] Furthermore, along the second direction, the length of the third protrusion 114 is L1, and the relationship between L1 and L2 satisfies: 0.25 ≤ L2 / L1 ≤ 0.5. For example, the value of L2 / L1 can be 0.25, 0.30, 0.40, 0.45, or 0.50, etc. By limiting the value of L2 / L1 within the above range, on the one hand, the length of the second protrusion 122 along the second direction is larger, and the volume of the fifth accommodating cavity 1141 formed inside the second protrusion 122 is larger. Consequently, the volume of the sixth accommodating cavity 1241 formed inside the fourth protrusion 124 in the first plastic part 120 that cooperates with the encapsulation cover 110 is larger, which can accommodate the second protrusion 230 of the battery cell electrode assembly 200 with a larger volume, and the capacity of the battery cell electrode assembly 200 is increased significantly. On the other hand, it ensures that the second protrusion 122 can be successfully stamped and formed, and the structural strength of the encapsulation cover 110 is high after forming.

[0041] See also Figure 4 and Figure 5In this embodiment, the electrode post 160 includes a plate portion 161, a first post 162, and a second post 163. The first post 162 is connected to the end of the plate portion 161 away from the cell electrode assembly 200, and the second post 163 is connected to the end of the plate portion 161 near the cell electrode assembly 200. The electrode post base plate 150 has a mounting groove 1521 on the side near the cover plate body 111. The mounting groove 1521 is used to accommodate the plate portion 161. Through the cooperation of the mounting groove 1521 and the plate portion 161, the positioning between the electrode post 160 and the electrode post base plate 150 is accurate, which helps to improve the assembly accuracy and assembly yield. Furthermore, the bottom wall of the mounting groove 1521 has a through hole 1522. The second post 163 passes through the through hole 1522 and is welded to the hole wall of the through hole 1522, thereby fixing the electrode post 160 to the electrode post base plate 150. The first post 162 passes through the first plastic body 121, the cover body 111, the second plastic part 130 and the connector 140 in sequence and is riveted to the connector 140, thereby realizing the fixation between the post 160 and the encapsulation cover 110, and the post 160 is reliably and stably fixed on the encapsulation cover 110.

[0042] Optionally, the second plastic part 130 includes a second plastic part body 131 and two first extensions 132. The second plastic part body 131 is disposed between two adjacent first protrusions 112 along the second direction. The two first extensions 132 are respectively located on both sides of the first protrusions 112 along the third direction, and each first extension 132 extends along the second direction. The middle part of the first extension 132 in the length direction is connected to the end of the second plastic part body 131 along the third direction. The two first extensions 132 are fixedly connected by the second plastic part body 131. The second plastic part body 131 and the two first extensions 132 form a first type of "H" shaped plate structure, thereby enabling the second plastic part 130 to avoid the first protrusions 112 on the encapsulation cover 110. The connector 140 includes a connector body 141 and two second extensions 142. The connector body 141 is disposed between two adjacent first protrusions 112 along the second direction. The two second extensions 142 are respectively located on both sides of the first protrusions 112 along the third direction, and each second extension 142 extends along the second direction. The middle part of the second extension 142 in the length direction is connected to the end of the connector body 141 along the third direction. The two second extensions 142 are fixedly connected by the connector body 141. The connector body 141 and the two second extensions 142 form a second type of "H" shaped plate structure, thereby enabling the connector 140 to avoid the first protrusions 112 on the encapsulation cover 110.

[0043] Optionally, the structure of the electrode base plate 150 is the same as that of the second plastic part 130. The electrode base plate 150 is stacked along the first direction on the side of the first plastic part body 121 near the cell electrode assembly 200. The electrode base plate 150 is electrically connected to the tabs 250 provided at the end positions of the cell electrode assembly 200 along the first direction, so as to conduct the current generated by the cell electrode assembly 200 through the electrode base plate 150 and the electrode body 160. The base plate 150 includes a base plate body 151 and two third extensions 152. The base plate body 151 is disposed between two adjacent second protrusions 122 along the second direction. The two third extensions 152 are located on both sides of the second protrusions 122 along the third direction, and each third extension 152 extends along the second direction. The middle part of the length direction of the two third extensions 152 is connected to the end of the base plate body 151 along the third direction. The two third extensions 152 are fixedly connected by the base plate body 151. The base plate body 151 and the two third extensions 152 form a third type of "H" shaped plate structure, thereby enabling the base plate body 151 to avoid the first protrusion 220 of the cell electrode assembly 200, so that the first protrusion 220 can be smoothly installed into the fourth receiving cavity 1221 of the second protrusion 122 on the first plastic part 120.

[0044] In this embodiment, the cell cover plate 100 adopts a symmetrical design in both the length and width directions, which can reduce the process window during the assembly of the cell cover plate 100. There is no need to distinguish between the two ends of the cell cover plate 100 in the length or width direction. Either end can be smoothly assembled with the cell electrode group 200, thus improving the process yield.

[0045] Furthermore, in this embodiment, four electrode posts 160 are provided. By providing multiple electrode posts 160, the current flow path can be increased to meet the needs of high current transmission. Additionally, the heating of the electrode posts 160 during charging and discharging of the battery cell is alleviated, which helps to extend the battery cell's service life. The cover plate body 111 has four first through holes 1111, located at the four corners of the cover plate body 111 and near the third protrusion 114. The first plastic body 121 has four second through holes 1211, located at the four corners of the first plastic body 121 and near the fourth protrusion 124. Each first extension 132 has a third through hole 1321 at both ends along the second direction, each second extension 142 has a fourth through hole 1421 at both ends along the second direction, and each third extension 152 has a through hole 1522 at both ends along the second direction. The first through hole 1111, the second through hole 1211, the third through hole 1321, the fourth through hole 1421, and the through hole 1522 correspond one-to-one. The first through hole 1111, the second through hole 1211, the third through hole 1321, and the fourth through hole 1421 are all used to allow the first post 162 to pass through, and the through hole 1522 is used to allow the second post 163 to pass through. This enables the assembly between the pole post 160 and the pole post base plate 150, as well as the assembly between the pole post 160 and the encapsulation cover 110, the first plastic part 120, the second plastic part 130, and the connector 140.

[0046] For example, along the first direction, the thickness of the connector body 141 and the second extension 142 are equal, both being T1, and the value of T1 is in the range of 2.5mm ≤ T1 ≤ 4mm. For example, the value of T1 can be 2.5mm, 3.0mm, 3.5mm, or 4.0mm, etc. By limiting the value of T1 to the above range, the mechanical strength of the connector 140 is ensured to be sufficiently high, enabling it to be smoothly riveted to the first post 162 of the pole post 160, and the connection strength after riveting is high, making it less prone to deformation problems, thus ensuring the stable fixation of the pole post 160 on the encapsulation cover 110 and high reliability.

[0047] Optionally, the cell cover 100 also includes four sealing elements 170, each corresponding to a terminal post 160. Each sealing element 170 is sleeved on the outside of a first post 162 and sandwiched between the first post 162 and the cover body 111. The sealing elements 170 can seal the gap between the first post 162 and the cover body 111, thereby ensuring good sealing of the cell cover 100.

[0048] See also Figures 4-7The second plastic part 130 includes a limiting plate 133, which surrounds the second plastic part body 131 and the first extension 132. The limiting plate 133 extends away from the encapsulation cover 110 along a first direction. The limiting plate 133, the second plastic part body 131, and the first extension 132 form a limiting space, and at least a portion of the connector 140 is embedded in the limiting space. Through the cooperation between the connector 140 and the limiting plate 133, the positioning between the connector 140 and the second plastic part 130 is accurate, which helps to improve the assembly yield and assembly accuracy of the cell cover 100.

[0049] See also Figures 11-14 This embodiment also provides a battery cell, which is a blade battery cell. The battery cell includes the aforementioned battery cell cover plate 100, battery cell electrode assembly 200, and battery cell housing 300. The battery cell housing 300 has two openings at both ends along the first direction, and the battery cell cover plate 100 has two openings. Each opening is welded to the encapsulation cover 110 of a battery cell cover plate 100, and the battery cell electrode assembly 200 is encapsulated by the two battery cell cover plates 100 and the battery cell housing 300. By adopting a specially designed cell cover plate 100, it is ensured that the cell electrode assembly 200 is not easily damaged when it is installed in the casing. The cell cover plate 100 provides good positioning and support for the cell electrode assembly 200. The cell electrode assembly 200 and the cell cover plate 100 are well matched. The support surfaces of the cell electrode assembly 200 and the cell cover plate 100 are balanced. At the same time, the cell electrode assembly 200 has a high space utilization rate within the cell cover plate 100 and the cell casing 300, resulting in high cell capacity and assembly ratio.

[0050] See Figure 10 In this embodiment, the cell housing 300 includes a first cylindrical body 310 and a second cylindrical body 320, with their ends close to each other along a first direction connected. The ends of the first cylindrical body 310 and the second cylindrical body 320 opposite to each other along the first direction are respectively welded to the encapsulation cover 110 of a cell cover plate 100, so that the cell cover plate 100 and the cell housing 300 form a closed space for mounting the cell electrode assembly 200. Further, a first partition 311 is provided inside the first cylindrical body 310, and a second partition 321 is provided inside the second cylindrical body 320. The first partition 311 and the second partition 321 respectively support the opposite end faces of the first cylindrical body 310 and the second cylindrical body 320 along a third direction to improve the structural strength of the cell housing 300. Simultaneously, the first partition 311 and the second partition 321 can also limit the movement of the cell electrode assembly 200.

[0051] Specifically, the cell electrode assembly 200 has two through slots 240 at its middle position along the second direction. These two through slots 240 are located at both ends of the electrode assembly body 210 along its length (first direction) and extend along the length of the electrode assembly body 210. The through slots 240 penetrate the electrode assembly body 210 and the end face of the second boss 230 along its thickness direction (third direction). The through slots 240 are used to cooperate with the first partition 311 inside the first cylinder 310 and the second partition 321 inside the second cylinder 320 to better fix the cell electrode assembly 200, reduce the risk of movement or displacement, and improve process yield and cell performance. The arrangement of the first partition 311 and the second partition 321 also facilitates heat dissipation at the center of the cell electrode assembly 200, resulting in good thermal management performance and good temperature uniformity. There is a gap between the end of the first partition plate 311 near the second cylinder 320 along the first direction and the port of the first cylinder 310 facing the second cylinder 320, and there is also a gap between the end of the second partition plate 321 near the first cylinder 310 along the first direction and the port of the second cylinder 320 facing the first cylinder 310, thereby avoiding the connection portion 241 between the two through slots 240 in the cell electrode assembly 200. When the cell electrode assembly 200 is assembled with the cell housing 300, the first cylinder 310 is inserted from one end of the cell electrode assembly 200, and the first partition plate 311 is inserted into the corresponding through slot 240. The second cylinder 320 is inserted from the other end of the cell electrode assembly 200, and the second partition plate 321 is inserted into the other corresponding through slot 240. The ends of the first cylinder 310 and the second cylinder 320 that are close to each other are spliced ​​and welded together, thereby ensuring a good seal at the splice of the first cylinder 310 and the second cylinder 320.

[0052] Optionally, a slot 312 is provided on the wall surface of the first cylinder 310 facing the second cylinder 320, and a protrusion 322 extends along the first direction on the wall surface of the second cylinder 320 facing the first cylinder 310. The protrusion 322 and the slot 312 engage with each other, thereby achieving the pre-fixation of the first cylinder 310 and the second cylinder 320. The positioning between the first cylinder 310 and the second cylinder 320 is accurate, which is beneficial to improving the welding yield between the first cylinder 310 and the second cylinder 320, and the sealing performance of the battery cell housing 300 is good.

[0053] Furthermore, at least one of the first cylindrical body 310 and the second cylindrical body 320 of the battery cell housing 300 is provided with an explosion-proof valve 400 to ensure the safety of the battery cell and avoid the risk of explosion. For example, in this embodiment, an example is given where both the first cylindrical body 310 and the second cylindrical body 320 are provided with explosion-proof valves 400.

[0054] The following uses samples from specific implementation cases to verify the relevant dimensional design of the above-mentioned cell cover plate 100. For details, please refer to Table 1.

[0055] Table 1 As can be seen from the above results, the values ​​of parameters H1, H2, B1-B2, W1 / B1, L2 / L1, T1, T2, A, and B2 in Examples 1 to 6 meet their corresponding size limitations. The processing yield of the cell cover 100 is high, the mechanical strength of the cell cover 100 is high, and the assembly yield of the cell cover 100 with the cell electrode assembly 200 and the cell housing 300 is high, with no abnormalities such as inaccurate positioning of the cell electrode assembly 200. After assembly, the cell electrode assembly 200 is undeformed and undamaged, the volume of the cell electrode assembly 200 is significantly increased, the cell capacity is large, meeting the needs of high current and high energy storage, and the cell product is of good quality.

[0056] In Comparative Example 1, the value of parameter B1-B2 is less than the minimum value of 16mm≤B1-B2≤60mm. At this time, the dimension of the third protrusion 114 of the encapsulation cover 110 in the cell cover plate 100 along the third direction is too small, and the volume of the fifth accommodating cavity 1141 formed inside the third protrusion 114 is small. Consequently, the volume of the sixth accommodating cavity 1241 inside the fourth protrusion 124 in the first plastic part 120 that cooperates with the encapsulation cover 110 is small, and the volume of the second protrusion 230 of the cell electrode group 200 does not increase significantly, which is not conducive to the improvement of cell capacity and the cell product is defective.

[0057] In Comparative Example 2, the value of parameter B1-B2 is greater than the maximum value of 16mm≤B1-B2≤60mm. At this time, the dimension of the third protrusion 114 of the encapsulation cover 110 in the cell cover plate 100 along the third direction is too large. The yield of stamping the encapsulation cover 110 decreases, and the wall thickness at the third protrusion 114 decreases. The mechanical strength of the encapsulation cover 110 decreases, the protection effect on the cell electrode group 200 decreases, the reliability is low, and the cell product is defective.

[0058] In Comparative Example 3, the value of parameter W1 / B1 is less than the minimum value of 0.33 ≤ W1 / B1 ≤ 0.6. At this time, the dimension of the first protrusion 112 of the encapsulation cover 110 in the cell cover plate 100 along the third direction is too small, the volume of the second accommodating cavity 1121 formed inside the first protrusion 112 is small, and consequently the volume of the fourth accommodating cavity 1221 inside the second protrusion 122 in the first plastic part 120 that cooperates with the encapsulation cover 110 is small. The volume increase of the first protrusion 220 of the cell electrode group 200 is not significant, which is not conducive to the improvement of cell capacity and results in defective cell products.

[0059] In Comparative Example 4, the value of parameter W1 / B1 is greater than the maximum value of 0.33 ≤ W1 / B1 ≤ 0.6. At this time, the dimension of the first protrusion 112 of the encapsulation cover 110 in the third direction is too large, the yield of stamping the encapsulation cover 110 decreases, and the wall thickness at the first protrusion 112 decreases, the mechanical strength of the encapsulation cover 110 decreases, the protection effect on the cell electrode group 200 decreases, the reliability is low, and the cell product is defective.

[0060] In Comparative Example 5, the value of parameter L2 / L1 is less than the minimum value of 0.25 ≤ L2 / L1 ≤ 0.5. At this time, the spacing between the two first protrusions 112 along the second direction is insufficient, resulting in insufficient arrangement space for the connector body 141 and the second plastic body 131. The width of the connector body 141 and the second plastic body 131 along the second direction is small, and the second extension 142 and the first extension 132 cannot be stably and reliably connected. Furthermore, when the connector 140 is riveted to the electrode post 160, the connector 140 is prone to deformation, reducing the reliability and safety of the cell cover 100 and causing defective cell products.

[0061] In Comparative Example 6, the value of parameter L2 / L1 is greater than the maximum value of 0.25 ≤ L2 / L1 ≤ 0.5. At this time, the distance between the two first protrusions 112 along the second direction is relatively large, the length of the first protrusion 112 along the second direction is shortened, the volume of the second accommodating cavity 1121 formed inside the first protrusion 112 is small, and consequently the volume of the fourth accommodating cavity 1221 inside the second protrusion 122 in the first plastic part 120 that cooperates with the encapsulation cover 110 is small. The volume increase of the first protrusion 220 of the cell electrode group 200 is not significant, which is not conducive to the improvement of cell capacity and results in defective cell products.

[0062] Taking all factors into consideration, when the dimensions of the cell cover 100 meet the above-mentioned dimensional requirements, the processing yield of the cell cover 100 can be guaranteed to be high, the assembly yield of the cell cover 100 with the cell electrode assembly 200 and the cell housing 300 can be high, the cell electrode assembly 200 can be installed in the housing without scratches, and the positioning can be accurate after installation. Furthermore, the volume of the cell electrode assembly 200 is significantly increased, the cell capacity is larger, meeting the needs of high current and high energy storage, and the cell product is of good quality.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell cover plate, characterized in that, The cell cover plate includes: The encapsulation cover includes a cover plate body, on which a first protrusion is provided, the first protrusion extending along a first direction away from the cell electrode group; A first plastic component is provided, wherein the encapsulation cover is disposed on the side of the component close to the battery cell electrode assembly along a first direction. The first plastic component includes a first plastic component body, and a second protrusion is provided on the first plastic component body. The second protrusion extends away from the battery cell electrode assembly along the first direction, and the end face of the first plastic component body facing away from the battery cell electrode assembly is in contact with the end face of the cover plate body facing the battery cell electrode assembly. The surface of the second protrusion facing away from the battery cell electrode assembly is in contact with the surface of the first protrusion facing the battery cell electrode assembly. The second plastic component is disposed on the side of the encapsulation cover away from the cell electrode assembly along the first direction; A connector is disposed on the side of the second plastic part away from the battery cell electrode assembly along the first direction; The current-conducting terminal includes a base plate and a post body. The base plate is located on the side of the first plastic part body close to the cell electrode assembly along a first direction. One end of the post body is connected to the base plate, and the other end of the post body passes through the first plastic part, the encapsulation cover, and the second plastic part and is connected to the connector. The end of the post body away from the cell electrode assembly and the end face of the connector away from the cell electrode assembly are both lower than the end face of the first convex bulge away from the cell electrode assembly.

2. The cell cover plate according to claim 1, characterized in that, The encapsulation cover includes a first side plate, which is connected to the cover body in the circumferential direction and extends toward the battery cell electrode group. The cover body and the first side plate form a first receiving cavity. The first protrusion faces the battery cell electrode group to form a second receiving cavity, and the second receiving cavity communicates with the first receiving cavity. The first plastic part includes a second side plate, which is connected to the body of the first plastic part in the circumferential direction and extends toward the battery cell electrode group. The end faces of the second side plate and the first side plate that are close to each other are in contact with each other. The body of the first plastic part and the second side plate form a third accommodating cavity. The side of the second protrusion facing the battery cell electrode group forms a fourth accommodating cavity. The fourth accommodating cavity is in communication with the third accommodating cavity.

3. The cell cover plate according to claim 2, characterized in that, The electrode post includes a plate body, a first post, and a second post. The first post is connected to the end of the plate body away from the battery cell electrode assembly, and the second post is connected to the end of the plate body near the battery cell electrode assembly. The bottom plate of the electrode post has a mounting groove on the side near the cover plate body. The mounting groove is used to accommodate the plate body. The bottom wall of the mounting groove has a through hole. The second post passes through the through hole and is welded to the hole wall. The first post passes through the first plastic part body, the cover plate body, the second plastic part, and the connector in sequence and is riveted to the connector.

4. The cell cover plate according to claim 3, characterized in that, The cover plate body is provided with a first through hole, the first plastic part body is provided with a second through hole, the second plastic part is provided with a third through hole, and the connector is provided with a fourth through hole. The first through hole, the second through hole, the third through hole, and the fourth through hole are all used to allow the first column to pass through, and the through hole is used to allow the second column to pass through.

5. The cell cover plate according to claim 4, characterized in that, The cell cover includes a sealing element, which is sleeved on the first column and sandwiched between the first column and the cover body. The sealing element is used to seal the gap between the first column and the cover body.

6. The cell cover plate according to claim 4, characterized in that, The first convex bulge and the second convex bulge are provided in pairs, with the two first convex bulges spaced apart at both ends of the cover plate body along the second direction, and the two second convex bulges spaced apart at both ends of the first plastic part body along the second direction.

7. The cell cover plate according to claim 6, characterized in that, The second plastic part includes a second plastic part body and a first extension. The second plastic part body is disposed between two adjacent first protrusions along the second direction. The first extension is located on the side of the first protrusion along the third direction and extends along the second direction. The middle part of the first extension is connected to the end of the second plastic part body along the third direction. The end of the first extension along the second direction is provided with the third through hole. The connector includes a connector body and a second extension. The connector body is disposed between two adjacent first protrusions along the second direction. The second extension is located on the side of the first protrusion along the third direction and extends along the second direction. The middle part of the second extension is connected to the end of the connector body along the third direction. The end of the second extension along the second direction is provided with the fourth through hole. The pole base plate includes a base plate body and a third extension. The base plate body is disposed between two adjacent second protrusions along the second direction. The third extension is located on the side of the second protrusion along the third direction and extends along the second direction. The middle part of the third extension is connected to the end of the base plate body along the third direction. The end of the third extension along the second direction is provided with the through hole.

8. The cell cover plate according to claim 7, characterized in that, The second plastic part includes a limiting plate, which is disposed around the body of the second plastic part and the first extension. The limiting plate extends in a first direction away from the encapsulation cover. The limiting plate, the second plastic part body, and the first extension form a limiting space. At least a portion of the connector is embedded in the limiting space.

9. The cell cover plate according to claim 2, characterized in that, The two first side plates opposite each other along the third direction in the encapsulation cover are provided with a third protrusion. The two third protrusions protrude in opposite directions. The inner side of the third protrusion forms a fifth receiving cavity, which is connected to the first receiving cavity. In the first plastic part, a fourth protrusion is provided on each of the two second side plates opposite to each other along a third direction. The two fourth protrusions protrude in opposite directions. The inner side of the fourth protrusion forms a sixth receiving cavity. The sixth receiving cavity is connected to the third receiving cavity. The end faces of the fourth protrusion and the third protrusion that are close to each other fit together.

10. A battery cell, characterized in that, The cell cover plate included in any one of claims 1-9.

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