A top cover assembly and an electric cell device

Abstract

The application discloses a top cover assembly and a battery cell device, and relates to the technical field of energy storage. The top cover assembly comprises a cover plate, a lower plastic part and a pole member. The pole member comprises a first pole part. The first pole part is provided with at least two convex connecting parts away from the lower plastic part. The two adjacent convex connecting parts make the first pole part form a gas permeation channel arranged along the length direction of the cover plate. When used in the battery cell device, the convex connecting parts of the first pole part of the pole member are used to be connected with the tabs of the battery cell. The convex connecting parts also abut against the battery cell. The added support structure can maintain the convex connecting parts from being deformed too much. When the battery cell appears thermal runaway, the high-temperature airflow generated can melt the lower plastic part. Because the first pole part has a high melting point, the existence of the convex connecting parts and the support structure can avoid the situation that the battery cell pops towards the top cover to extrude the gas permeation channel.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a top cover assembly and a battery cell device. Background Technology

[0002] With the rapid development of battery technology, batteries are widely used in various application scenarios, which places higher demands on battery safety performance. In particular, during thermal runaway, the internal temperature of a battery rises rapidly and releases high-temperature gases. This high-temperature gas release process causes the lower plastic layer to melt and lose its support. Without the support of the lower plastic layer, the battery cell will eject towards the top cover, blocking the release of high-temperature gases and posing a significant safety hazard. Summary of the Invention

[0003] This application aims to solve one of the aforementioned technical problems in the prior art. To this end, embodiments of this application provide a top cover assembly.

[0004] This application also provides a battery cell device.

[0005] According to an embodiment of the first aspect of this application, a top cover assembly is provided, including a cover plate; The lower plastic part is installed on the cover plate; Two pole members are spaced apart on the cover plate. The pole members include a first pole member located on the side of the lower plastic part facing away from the cover plate. The first pole member has at least two protrusions away from the lower plastic part. Two adjacent protrusions form a venting channel along the length of the cover plate. The protrusions are used to connect with the tabs of the battery cell. A support structure is provided between the protrusions and the lower plastic part.

[0006] The aforementioned top cover assembly has at least the following beneficial effects: When used in a battery cell device, the protruding part of the first pole member of the pole member is used to connect with the electrode tab of the battery cell, and the protruding part also serves to abut against the battery cell. The added support structure can maintain the protruding part from excessive deformation, thereby maintaining the formation of the venting channel. When the battery cell experiences thermal runaway, the generated high-temperature airflow will melt the lower plastic part. The presence of the protruding part and the support structure can prevent the battery cell from popping out towards the top cover and squeezing the venting channel. The protruding part and the support structure work together to support and maintain the venting channel after the lower plastic part melts, allowing the high-temperature airflow to be discharged in time through the venting channel.

[0007] According to the top cover assembly of the first aspect of this application, at least two first support portions are provided on the side of the lower plastic part facing away from the cover plate, and a plurality of first support portions are spaced apart along the length direction of the cover plate. The first support portions are used to press against the battery cells in the battery cell device, and the distance between the first support portions and the cover plate is greater than the distance between the protruding portion and the cover plate.

[0008] According to the top cover assembly of the first aspect of this application, the lower plastic part is provided with a second support portion at the position corresponding to the protrusion portion, the second support portion abuts against the protrusion portion, and the second support portion is formed as the support structure.

[0009] According to the top cover assembly of the first aspect of this application, the lower plastic part has a first groove recessed on the side near the cover plate member toward the other side, so that the side of the lower plastic part facing away from the cover plate member forms the second support portion.

[0010] According to the top cover assembly of the first aspect of this application, a plurality of ribs are provided in the first groove.

[0011] According to the top cover assembly of the first aspect of this application, the cover plate is provided with a third support portion at the position corresponding to the first groove, and the third support portion abuts against the bottom of the first groove.

[0012] According to the top cover assembly of the first aspect of this application, at least a portion of the cover plate on the side facing away from the lower plastic part is recessed into a second groove toward the other side, so that the side of the cover plate facing the lower plastic part forms the third support portion.

[0013] According to the top cover assembly of the first aspect of this application, at least a portion of the lower plastic part on the side of the cover plate member close to the lower plastic part is recessed into a third groove toward the other side, so that the side of the lower plastic part facing away from the cover plate member forms the first support portion. The third groove is provided with a first vent hole near the groove wall of the pole member, and the third groove is provided with a second vent hole away from the groove wall of the pole member.

[0014] According to an embodiment of a second aspect of this application, a battery cell device is provided, comprising: The top cover assembly described in the first aspect embodiment; Battery cell; The housing has a storage cavity in which the battery cell is housed. The top cover assembly is connected to the housing and closes the opening of the storage cavity. The protruding part is connected to the electrode tab of the battery cell.

[0015] According to the battery cell device described in the second aspect of this application, an insulating member for support is provided at the bend of the electrode tab.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The present application will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the structure of the battery cell device according to an embodiment of this application. Figure 1 ; Figure 2 This is a schematic diagram of the top cover assembly in an embodiment of this application; Figure 3 yes Figure 2 A cross-sectional view along the AA direction; Figure 4 yes Figure 2 A cross-sectional view along the BB direction; Figure 5 This is a schematic diagram of the structure of the first pole piece in this embodiment of the application. Figure 1 ; Figure 6 This is a schematic diagram of the structure of the first pole piece in this embodiment of the application. Figure 2 ; Figure 7 This is a schematic diagram of the structure of the lower plastic part in an embodiment of this application. Figure 1 ; Figure 8 This is a schematic diagram of the structure of the lower plastic part in an embodiment of this application. Figure 2 ; Figure 9 This is a schematic diagram of the structure of the lower plastic part in an embodiment of this application. Figure 3 ; Figure 10 This is a schematic diagram of the cover plate structure in an embodiment of this application. Figure 1 ; Figure 11 This is a schematic diagram of the cover plate structure in an embodiment of this application. Figure 2 ; Figure 12 yes Figure 11 A cross-sectional view along the CC direction; Figure 13 This is a schematic diagram of the cover plate structure in an embodiment of this application. Figure 3 ; Figure 14 This is a schematic diagram of the structure of the lower plastic part in an embodiment of this application. Figure 4 ; Figure 15 This is a schematic diagram of the structure of the first pole piece in this embodiment of the application. Figure 3 ; Figure 16This is an exploded view of the top cover assembly in an embodiment of this application; Figure 17 This is a schematic diagram of the structure of the battery cell device in an embodiment of this application. Figure 2 ; Figure 18 yes Figure 17 A cross-sectional view along the DD direction.

[0018] Reference numerals: housing 100, battery cell 200, electrode tab 210, insulating part 220, top cover assembly 300, cover plate 310, second groove 311, third support part 311a, lower plastic part 320, third groove 321, first support part 321a, Mylar heat melting point area 3211, second vent 3212, first vent 3213, fourth groove 322, fourth support part 322a, vent hole 3221, vent grille 3222, clearance hole 323, first groove 324, second support part 324a, rib 3241, injection hole 325, second pole piece 330, first pole piece 340, connecting body 341, protruding part 342, support ear 343, vent channel 344, explosion-proof valve 350. Detailed Implementation

[0019] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0020] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0023] Reference Figures 2 to 5 The top cover assembly 300 provided in this application embodiment includes a cover plate 310, a lower plastic part 320, and a pole post component.

[0024] The lower plastic part 320 is installed on the cover plate part 310.

[0025] Two pole members are provided and are spaced apart on the cover plate 310 along the length of the cover plate 310. One pole member is used as the positive pole and the other pole member is used as the negative pole. The two pole members are located between the two first support parts 321a.

[0026] The electrode component includes a first electrode member 340, which is located on the side of the lower plastic part 320 facing away from the cover plate part 310. The first electrode member 340 is provided with at least two protrusions 342 away from the lower plastic part 320. The two adjacent protrusions 342 form a venting channel 344 in the first electrode member 340 along the length direction of the cover plate part 310. The protrusions 342 are used to connect with the tabs 210 of the battery cell 200. A support structure is provided between the protrusions 342 and the lower plastic part 320.

[0027] When used in a battery cell assembly, the protruding portion 342 of the first pole member 340 of the pole member is used to connect with the tab 210 of the battery cell 200, and the added support structure can maintain the protruding portion 342 from excessive deformation, thereby maintaining the formation of the ventilation channel 344.

[0028] When the battery cell 200 experiences thermal runaway, the resulting high-temperature airflow will melt the lower plastic part 320. The presence of the protrusion 342 and the support structure can prevent the battery cell 200 from popping out towards the top cover and squeezing the venting channel 344. The protrusion 342 and the support structure work together to support and maintain the venting channel 344 after the lower plastic part 320 melts, allowing the high-temperature airflow to be discharged in time through the venting channel 344.

[0029] In some embodiments, at least two first support portions 321a are provided on the side of the lower plastic part 320 facing away from the cover plate part 310. The first support portions 321a are used to press against the battery cell 200 in the battery cell device. Multiple first support portions 321a are spaced apart along the length direction of the cover plate part 310. The distance between the first support portions 321a and the cover plate part 310 is greater than the distance between the protrusion portion 342 and the cover plate part 310.

[0030] When used in a battery cell assembly, the first support portion 321a of the lower plastic part 320 can press against the battery cell 200 inside the battery cell assembly after encapsulation. It should be noted that, since the distance between the first support portion 321a and the cover plate 310 is greater than the distance between the protrusion portion 342 and the cover plate 310, the first support portion 321a plays the main supporting role under normal conditions.

[0031] When the battery cell 200 experiences thermal runaway, the resulting high-temperature airflow will melt the first support portion 321a and cause it to lose its function of supporting the battery cell 200. The presence of the protruding portion 342 and the support structure can prevent the battery cell 200 from popping out towards the top cover and squeezing the ventilation channel 344. The protruding portion 342 and the support structure work together to support and maintain the ventilation channel 344 after the first support portion 321a melts, allowing the high-temperature airflow to be discharged in time through the ventilation channel 344.

[0032] In the embodiment shown in this application, both ends of the lower plastic part 320 on the side facing away from the cover plate part 310 are provided with first support portions 321a, which restrict the movement of the battery cell 200 within the battery cell assembly. In some other embodiments, a first support portion 321a may also be provided between the two electrode post members.

[0033] In this embodiment, the pole member further includes a second pole member 330, which is located on the side of the cover plate 310 away from the lower plastic part 320. The connecting end of the second pole member 330 passes through the cover plate 310 and the lower plastic part 320 in sequence and is connected to the second pole member 330. This connection can be riveting or welding. The second pole member 330 is made of copper-aluminum alloy, and the first pole member 340 is made of copper.

[0034] In some specific embodiments, sealing rings are provided at the connection between the second pole member 330 and the cover plate member 310 and at the connection between the first pole member 340 and the cover plate member 310, and the lower plastic member 320 has a clearance hole 323 for avoiding the connection end of the second pole member 330.

[0035] In some embodiments, such as Figure 5 and Figure 6 As shown, the first pole piece 340 includes a connecting body 341 and two protruding portions 342. The two sides of the connecting body 341 are recessed towards the side away from the cover plate 310 to form the protruding portions 342, so that the connecting body 341 and the two protruding portions 342 form a recess, thereby forming the aforementioned air vent 344. In this embodiment, the protruding portions 342 are formed by stamping.

[0036] The lower side of the protruding part 342 of the plastic part 320 can partially abut against the supporting structure, or the lower side of the protruding part 342 of the plastic part 320 can abut against the supporting structure completely. Whether the supporting structure supports part or all of the protruding part 342, it can play the role of supporting the protruding part 342.

[0037] In some other embodiments, the edge of the protrusion 342 is bent towards the cover plate 310 to form a support ear 343 that abuts against the lower plastic part 320. The support ear 343 forms a support structure. By bending and forming the support ear 343, the support ear 343 abuts against the lower plastic part 320, thereby preventing the protrusion 342 from deforming under force and affecting the ventilation channel 344. That is, the support structure can be part of the protrusion 342, and the support structure is not connected to the lower plastic part 320.

[0038] The support structure can also be a separate component and fill at least part of the space between the protrusion 342 and the lower plastic part 320. The support structure is mainly used to support the protrusion 342 when it is under force and to prevent the protrusion 342 from deforming or moving further towards the lower plastic part 320. In this embodiment, the support structure is not connected to the lower plastic part 320 or the protrusion 342.

[0039] In the embodiment shown in this application, both ends of the protrusion 342 along the length of the cover plate 310 are bent with support ears 343, which support the two suspended ends of the protrusion 342. In some other embodiments, the support ears 343 can also be fixed to the protrusion 342 by welding or bolting. Since the support structure is provided on the protrusion 342, the structure of the lower plastic part 320 is as follows: Figure 7 As shown.

[0040] In some other embodiments, such as Figure 8 and Figure 9 As shown, a second support portion 324a is provided on the lower plastic part 320 at the position corresponding to the protrusion 342. The second support portion 324a abuts against the protrusion 342 and forms a support structure. In this embodiment, the support structure is fixed to the lower plastic part 320.

[0041] In the embodiment shown in this application, the lower plastic part 320 has a first groove 324 recessed on the side near the cover plate 310, so that a second support portion 324a is formed on the side of the lower plastic part 320 facing away from the cover plate 310. In this case, the second support portion 324a is part of the lower plastic part 320, that is, the second support portion 324a is formed together with the lower plastic part 320 during injection molding. The second support portion 324a formed in this way has high structural strength and is easy to manufacture.

[0042] In some other embodiments, the first groove 324 can be elongated, so that the formed second support portion 324a can support most of the position of the protrusion portion 342; in other embodiments, the first groove 324 can also be rectangular, circular or other polygonal, and multiple first grooves 324 form multiple second support portions 324a to support the same protrusion portion 342, that is, a protrusion portion 342 can be supported by multiple second support portions 324a or by a single elongated second support portion 324a.

[0043] like Figure 9 As shown, a plurality of raised ribs 3241 are provided in the first groove 324. By adding a plurality of ribs to connect the opposite side walls of the first groove 324, the structural strength of the second support 324a can be further enhanced, enabling it to withstand greater loads.

[0044] In some other embodiments, such as Figure 14 As shown, the first groove 324 may not have a raised rib 3241. Conversely, as... Figures 10 to 13 As shown, the cover plate 310 is provided with a third support portion 311a at the position corresponding to the first groove 324, and the third support portion 311a abuts against the bottom of the first groove 324. By having the third support portion 311a abut against the bottom of the first groove 324, the structural strength of the second support portion 324a is improved, which can greatly improve the deformation resistance of the second support portion 324a.

[0045] In some specific embodiments, such as Figure 13 As shown, at least a portion of the cover plate 310 on the side facing away from the lower plastic part 320 is recessed into a second groove 311 towards the other side, so that a third support portion 311a is formed on the side of the cover plate 310 facing the lower plastic part 320. The third support portion 311a is formed by stamping the cover plate 310.

[0046] Among them, such as Figure 12 and Figure 13 As shown, the second groove 311 is elongated, and the resulting third support portion 311a can just fill the first groove 324.

[0047] In some other embodiments, since the support structure is part of the lower plastic part 320, the structure of the first pole piece 340 is as follows: Figure 15 As shown.

[0048] like Figure 16As shown, the second groove 311 is circular, and the first groove 324 is elongated. Multiple third support portions 311a are formed by the multiple second grooves 311. The multiple third support portions 311a abut against the first groove 324, which can also serve to support and strengthen the structural strength of the first groove 324 and the second support portion 324a. The shape of the second groove 311 can also be triangular or other polygonal.

[0049] like Figure 7 and Figure 4 As shown, at least a portion of the lower plastic part 320 is recessed into a third groove 321 on one side of the cover plate 310, so that the side of the lower plastic part 320 facing away from the cover plate 310 forms a first support portion 321a. The third groove 321 is provided with a first vent 3213 near the groove wall of the pole member, and at least two second vents 3212 are provided on the groove wall of the third groove 321 away from the pole member. The third groove 321 is provided with a Mylar hot melt point region 3211 in the middle of the groove wall away from the pole member. The Mylar hot melt point region 3211 is used for the hot melt connection of the Mylar film.

[0050] When the top cover assembly 300 of this application is used in a battery cell device, when the battery cell 200 of the battery cell device experiences thermal runaway, the gas generated from the bottom of the battery cell 200 comes up through both sides of the battery cell 200, passes through the first exhaust port 3213 and the second exhaust port 3212 and enters the ventilation channel 344, and then is guided to the exhaust structure of the top cover assembly 300 through the exhaust channel.

[0051] In some specific embodiments, the cover plate 310 further includes an explosion-proof hole that extends through both sides of the cover plate 310 and is located in the middle of the cover plate 310. The explosion-proof hole is used to accommodate the explosion-proof valve 350 and the protective plate, and the explosion-proof hole and the protective plate are formed as the above-described venting structure.

[0052] In some other embodiments, a fourth groove 322 is provided at the position of the explosion-proof valve 350 corresponding to the lower plastic part 320, so that a fourth support part 322a is formed on the side of the lower plastic part 320 facing away from the cover plate part 310. The fourth support part 322a is used to provide a certain support function when the support structure and the first support part 321a fail. The groove wall of the fourth groove 322 is provided with a ventilating grille 3222 and a vent hole 3221. The ventilating grille 3222 and the vent hole 3221 are provided to facilitate the passage of gas and the discharge of gas from the explosion-proof hole.

[0053] In some other embodiments, the lower plastic part 320 is also provided with an injection hole 325 for electrolyte injection.

[0054] like Figure 1 , Figure 17 as well as Figure 18As shown, this application embodiment also provides a battery cell device, which includes a battery cell 200, a housing 100 and the aforementioned top cover assembly 300. The housing 100 has a storage cavity, in which the battery cell 200 is housed. The top cover assembly 300 is connected to the housing 100 and closes the opening of the storage cavity. The protruding part 342 is connected to the tab 210 of the battery cell 200.

[0055] The number of battery cells 200 is at least two, and the number of protrusions 342 is the same as the number of battery cells 200. One protrusion 342 of one pole member corresponds to one battery cell 200.

[0056] When the first support portion 321a is provided on the side of the plastic part 320 facing away from the cover plate part 310, the first support portion 321a abuts against the battery cell 200.

[0057] Specifically, the sealed storage cavity is filled with electrolyte, and the insulating component 220 is made of a material that does not react with the internal substances or electrolyte of the battery cell 200.

[0058] In some embodiments, the bend of the tab 210 is provided with an insulating element 220 for support.

[0059] It should be noted that the tabs 210 are all bent. The insulating part 220 is placed at the bend of the tab 210. On the one hand, it can play a certain plastic fixing role for the tab 210 to prevent the tab 210 from being inserted into the wall. On the other hand, the insulating part 220 can support the tab 210, fill the gap at the bend of the tab 210, and thus abut against the protrusion 342 to prevent the protrusion 342 from moving downward toward the cell 200.

[0060] In some other embodiments, the application also provides an energy storage system that includes the aforementioned battery cell device, which is mainly used to supply power to electrical equipment.

[0061] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A cap assembly, characterized by: include Cover plate; The lower plastic part is installed on the cover plate; Two pole members are spaced apart on the cover plate. The pole members include a first pole member located on the side of the lower plastic part facing away from the cover plate. The first pole member has at least two protrusions away from the lower plastic part. Two adjacent protrusions form a venting channel along the length of the cover plate. The protrusions are used to connect with the tabs of the battery cell. A support structure is provided between the protrusions and the lower plastic part.

2. The roof assembly of claim 1, wherein: At least two first support portions are provided on the side of the lower plastic part facing away from the cover plate. Multiple first support portions are spaced apart along the length direction of the cover plate. The first support portions are used to press against the battery cells in the battery cell device. The distance between the first support portions and the cover plate is greater than the distance between the protruding portion and the cover plate.

3. The roof assembly of claim 1 or 2, wherein: The lower plastic part is provided with a second support part at the position corresponding to the protrusion, the second support part abuts against the protrusion, and the second support part forms the support structure.

4. The roof assembly of claim 3, wherein: The lower plastic part has a first groove recessed on the side near the cover plate, so that the side of the lower plastic part facing away from the cover plate forms the second support portion.

5. The top cover assembly according to claim 4, characterized in that: Multiple raised ribs are provided in the first groove.

6. The roof assembly of claim 4, wherein: The cover plate is provided with a third support part at the position corresponding to the first groove, and the third support part abuts against the bottom of the first groove.

7. The roof assembly of claim 6, wherein: At least a portion of the cover plate on the side facing away from the lower plastic part is recessed into a second groove on the other side, so that the side of the cover plate facing the lower plastic part forms the third support portion.

8. The roof assembly of claim 2, wherein: At least a portion of the lower plastic part is recessed into the side of the cover plate member that is close to the other side to form a third groove, so that the side of the lower plastic part facing away from the cover plate member forms the first support portion. The third groove is provided with a first vent hole near the groove wall of the pole member, and the third groove is provided with a second vent hole away from the groove wall of the pole member.

9. An electrochemical cell device, characterized by: include The top cover assembly according to any one of claims 1 to 8; Battery cell; The housing has a storage cavity in which the battery cell is housed. The top cover assembly is connected to the housing and closes the opening of the storage cavity. The protruding part is connected to the electrode tab of the battery cell.

10. The cell device according to claim 9, characterized in that: The bent portion of the electrode tab is provided with an insulating component for support.

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