Top cover assembly, battery monomer and battery pack

Abstract

The utility model provides a top cover subassembly, battery cell and battery pack, the top cover subassembly includes cover plate, first current collector, first pole and turning piece, first current collector is electrically connected with a plurality of first pole piece of pole piece subassembly of battery cell, first pole is electrically connected with first current collector, first pole piece is electrically connected with first pole piece subassembly of battery cell, and turning piece is electrically connected with first pole piece subassembly of battery cell. The turnover piece is electrically connected with the first pole and the cover plate in a first state, and disconnects the electrical connection between the first pole and the cover plate in a second state. When the battery cell is in an abnormal state, the overturning piece is configured to be in a first state, so that the first current collector is electrically connected to the cover plate through the first pole and the overturning piece, and the first current collector is fused. According to the top cover assembly provided by the utility model, the charging loop can be quickly cut off when the battery core is in an abnormal state, so that the safety problems of thermal runaway, explosion and the like caused by continuous charging of the battery in the abnormal state are avoided.

Description

Technical Field

[0001] This utility model relates to the field of batteries, specifically to a top cover assembly, a battery cell, and a battery pack. Background Technology

[0002] The top cover assembly is an indispensable part of the battery cell structure, primarily used to isolate and protect the internal structure of the cell to ensure its normal operation. However, common top cover assemblies typically do not consider the protection requirements of the cell under overcharge conditions. When an overcharge occurs, the safety and stability of the battery cannot be effectively guaranteed. Therefore, how to design an effective overcharge protection structure in the top cover assembly of the battery cell to improve cell safety is a crucial problem that urgently needs to be solved in the current battery technology field. Utility Model Content

[0003] Embodiments of this utility model provide a top cover assembly, a battery cell, and a battery pack to solve the problem that the top cover assembly of the battery cell in related technologies cannot provide effective protection against overcharging.

[0004] In a first aspect, embodiments of the present invention provide a top cover assembly, comprising: a cover plate; a first current collector adapted to be electrically connected to a plurality of first electrodes of an electrode assembly of a battery cell; a first electrode post electrically connected to the first current collector; and a flip member adapted to electrically connect the first electrode post and the cover plate in a first state and disconnect the electrical connection between the first electrode post and the cover plate in a second state; wherein, when the battery cell is in an abnormal state, the flip member is configured to be in the first state, so that the first current collector is electrically connected to the cover plate through the first electrode post and the flip member, thereby causing the first current collector to melt.

[0005] In some embodiments, the top cover assembly further includes a conductive element and a fixing element, wherein the flipping element is adapted to be electrically connected to the first pole via the conductive element in a first state; wherein the fixing element fixes the conductive element to the cover plate.

[0006] In some embodiments, the top cover assembly further includes a first insulating member, and a conductive member is mounted on the first insulating member; wherein, a retainer secures the first insulating member to the cover plate.

[0007] In some embodiments, the first insulating member includes a first insulating body, the first insulating body having an insulating pressing portion, and the fixing member includes a fixing pressing portion, the fixing pressing portion pressing against the insulating pressing portion toward the cover plate.

[0008] In some embodiments, the first insulating element includes a first insulating body, one end of which is adapted to mount a first pole post, wherein a fixing element fixes the other end of the first insulating body to a cover plate.

[0009] In some embodiments, the first insulating element includes a first insulating body and a first insulating top plate. The first insulating body has a mounting cavity for mounting a conductive element, and the first insulating top plate is mounted on the first insulating body to press against the conductive element.

[0010] In some embodiments, one end of the first insulating body is adapted to expose the first pole post, wherein the first insulating top plate is mounted at the other end of the first insulating body.

[0011] In some embodiments, the conductive element has a first groove configured to accommodate a flipping element; wherein the depth of the first groove is 0.2 mm to 0.4 mm.

[0012] In some embodiments, a conductive element is also included. The flipping element is adapted to be electrically connected to the first terminal in a first state via the conductive element. When the battery cell is in a normal state, the distance between the flipping element and the conductive element in the thickness direction of the top cover assembly is 0.1 mm to 0.7 mm.

[0013] In some embodiments, the first current collector includes a main body, a fusible portion, and a fixing portion. The fusible portion is connected between the main body and the fixing portion. The main body is configured to connect to an electrode post. A second groove is provided at one end of the first current collector away from the main body. The second groove is configured to cooperate with the edge of the first current collector to form the fusible portion.

[0014] In some embodiments, the first current collector includes a main body, a fusible portion, and a fixing portion, with a slot formed between the main body and the fixing portion, and the portion of the first current collector located between the slot and the edge of the first current collector forming the fusible portion.

[0015] Secondly, embodiments of the present invention provide a battery cell that includes a top cover assembly as described in the first aspect.

[0016] Thirdly, embodiments of the present invention provide a battery pack that includes the battery cells of the second aspect.

[0017] This utility model provides a top cover assembly, a battery cell, and a battery pack. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of the top cover assembly provided in an embodiment of the present utility model;

[0020] Figure 2 This is a structural schematic diagram of the top cover assembly from another perspective provided by an embodiment of the present invention;

[0021] Figure 3 yes Figure 1 Top view of the top cover assembly;

[0022] Figure 4 yes Figure 3 Cross-sectional view of the top cover assembly;

[0023] Figure 5 yes Figure 4 Enlarged view of section A;

[0024] Figure 6 This is a schematic diagram of the structure of the first current collector provided in this embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of another first current collector provided in an embodiment of the present invention;

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Top cover assembly; 110. First current collector; 120. First pole post; 130. Flip-over component; 140. Conductive component; 150. Fixing component; 160. First insulating component; 170. Insulating pressing part; 180. Fixing pressing part; 190. First insulating top plate; 200. Main body; 210. Fusible part; 220. Fixing part; 230. Second groove; 240. Slot; 300. Cover plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0029] To address the problem that top cover assemblies for battery cells in related technologies cannot provide effective protection against overcharging, embodiments of this utility model provide a top cover assembly 100 for battery cells. Please refer to... Figure 1 , Figure 2 , Figure 1 This is a structural schematic diagram of the top cover assembly 100 provided in this embodiment of the utility model. Figure 2 This is a structural schematic diagram of the top cover assembly from another perspective provided by an embodiment of the present utility model.

[0030] Specifically, in some embodiments, please refer to Figure 3 , Figure 4 and Figure 5 , Figure 3 yes Figure 1 Top view of the top cover assembly. Figure 4 yes Figure 3 A cross-sectional view of the top cover assembly. Figure 5 yes Figure 4 The enlarged view of part A shows that the top cover assembly 100 includes a cover plate 300, a first current collector 110, a first terminal post 120, and a flip-up element 130. The first current collector 110 is electrically connected to multiple first terminals of the electrode assembly (not shown) in the battery cell, while the first terminal post 120 is electrically connected to the first current collector 110, forming a pathway between the multiple first terminals and the first terminal post 120. The flip-up element 130 is electrically connected to the first terminal post 120 and the cover plate 300 in a first state, and disconnects the electrical connection between the first terminal post 120 and the cover plate 300 in a second state. When the battery cell is in an abnormal state, the flip-up element 130 is configured to be in the first state, so that the first current collector is electrically connected to the cover plate 300 through the first terminal post 120 and the flip-up element 130, and the first current collector is melted.

[0031] The top cover assembly 100 provided in this embodiment, when the battery cell is in an abnormal state (e.g., overcharging), has the flip-over member 130 in a first state, so that the first current collector is electrically connected to the cover plate 300. In the overcharge state, an overload occurs, causing the first current collector 110 to melt, thereby disconnecting the electrical connection between the cover plate 300 and the first terminal 120, and ultimately achieving the technical effect of cutting off the charging circuit of the battery cell. Through this structural design, the top cover assembly 100 can quickly cut off the charging circuit when the battery cell is in an abnormal state, avoiding the problem of continuous charging of the battery in an abnormal state, thus effectively avoiding safety problems such as thermal runaway and explosion caused by overcharging.

[0032] In some embodiments, please refer to Figure 4 , Figure 5 The top cover assembly 100 includes not only the cover plate 300, the first current collector 110, the first pole post 120 and the flip member 130 as described above, but also a conductive member 140 and a fixing member 150. The flip member 130 is used to be electrically connected to the first pole post 120 through the conductive member 140 in the first state, and the fixing member 150 is used to fix the conductive member 140 to the cover plate 300.

[0033] Specifically, the flip-up component 130 is electrically connected to the cover plate 300, while the conductive component 140 is electrically connected to the first terminal 120. When the battery cell is operating normally, the flip-up component 130 is in a second state, in which there is no electrical connection between the flip-up component 130 and the conductive component 140. When the battery cell is in an abnormal state, the flip-up component 130 is in a first state, in which it is electrically connected to the conductive component 140, thereby creating an electrical connection between the cover plate 300 and the first terminal 120. This causes the first current collector to melt due to current overload, thus cutting off the charging circuit of the battery cell, preventing further charging of the battery cell and preventing further safety hazards such as thermal runaway, expansion, or explosion. The above process can be referred to in the detailed description above.

[0034] Furthermore, when the flipping component 130 is in the first state, it comes into contact with the conductive component 140 and exerts a certain compressive force on it. This compressive force may cause deformation of the conductive component 140, making the electrical connection between the flipping component 130 and the conductive component 140 unstable. This means that the charging circuit cannot be quickly cut off when the battery cell is in an abnormal state, thus failing to effectively guarantee the safety of the battery cell. In this embodiment, the fixing component 150 is used to stably fix the conductive component 140 to the cover plate 300 to prevent deformation or loosening between the flipping component 130 and the conductive component 140 due to compression, thereby ensuring the stability of the electrical connection between them. Through this structural design, even during the process of applying compressive force to the flipping component 130, the conductive component 140 can still maintain a stable electrical connection with the flipping component 130, thereby ensuring that the charging circuit of the battery cell can be cut off in a timely manner when the battery cell is in an abnormal state, thus ensuring the safety of the battery cell.

[0035] In some embodiments, please refer to Figure 4 The top cover assembly 100 includes not only the cover plate 300, the first current collector 110, the first terminal post 120, the flip member 130, the conductive member 140, and the fixing member 150, but also a first insulating member 160. Specifically, the conductive member 140 is mounted on the first insulating member 160, and the fixing member 150 is configured to fix the first insulating member 160 to the cover plate 300.

[0036] The first insulating member 160 is configured to electrically isolate the conductive member 140 from the cover plate 300 to prevent the conductive member 140 from directly contacting the cover plate 300 and causing a short circuit or other electrical faults. The fixing member 150 is configured in this embodiment to stably fix the first insulating member 160 to the cover plate 300 to ensure that when the flipping member 130 exerts pressure on the conductive member 140, the first insulating member 160 is not easily displaced by the conductive member 140, thereby ensuring the stability of each component in the battery cell.

[0037] Specifically, in some embodiments, please refer to Figure 1 , Figure 4 The first insulating member 160 includes a first insulating body, the first insulating body is provided with an insulating pressing part 170, the fixing member 150 includes a fixing pressing part 180, and the fixing pressing part 180 contacts the insulating pressing part 170 on the side facing the cover plate 300 and applies pressure to fix the insulating pressing part 170 to the cover plate 300.

[0038] Since the first insulating member 160 is designed to limit the conductive member 140 to prevent the conductive member 140 from shifting or falling off, it ensures a stable electrical connection between the conductive member 140 and the flipping member 130 when the cell is in an abnormal state. In this embodiment, the insulating pressing part 170 on the first insulating member 160 is firmly pressed against the cover plate 300 by the fixing pressing part 180 of the fixing member 150, so that when the cell is in an abnormal state and the flipping member 130 applies pressure to the conductive member 140, the position of the first insulating member 160 can still remain stable, avoiding displacement caused by the conductive member 140 pressing against the first insulating member 160. This structural design ensures that the first insulating member 160 can still limit the conductive member 140 under the stress conditions inside the battery, thereby ensuring a stable electrical connection between the conductive member 140 and the flipping member 130 when the cell is in an abnormal state, allowing the charging circuit of the cell to be cut off in time, ultimately ensuring the safety of the cell.

[0039] In some embodiments, please refer to Figure 1 , Figure 3 and Figure 4 The first insulating element 160 includes a first insulating body, one end of which is used to install the first pole post 120, and the fixing element 150 fixes the other end of the first insulating body to the cover plate 300.

[0040] Specifically, one end of the first insulating body has a pole mounting hole, and the first pole 120 is installed in the pole mounting hole, while the other end of the first insulating body is used to press against the conductive element 140. In this embodiment, the other end of the first insulating body is fixed to the cover plate 300 by the fixing member 150, so as to ensure that the part of the first insulating member 160 near the conductive element 140 can be effectively limited by the fixing member 150 when the cell is in an abnormal state, and it is not easy to be displaced. Through the pressing action of the fixing member 150, it can be effectively ensured that the first insulating member 160 can limit the conductive element 140, so as to ensure the electrical connection between the conductive element 140 and the flipping member 130.

[0041] In some embodiments, please refer to Figure 1 , Figure 4The first insulating element 160 includes a first insulating body and a first insulating top plate 190. The first insulating body has a mounting cavity for mounting the conductive element 140. The conductive element 140 is electrically isolated from the cover plate 300 through the mounting cavity. The first insulating top plate 190 is mounted at one end of the first insulating body, away from the first terminal post 120 of the battery, and is designed to press the conductive element 140 to keep it in a relatively stable position, preventing displacement, especially under abnormal conditions that may occur during battery operation. In these situations, pressure changes inside the battery may cause deformation or movement of other components, but the pressing design of the first insulating top plate 190 allows the conductive element 140 to remain in its original position, preventing unstable electrical connection between the conductive element 140 and the first insulating element 160 due to displacement.

[0042] In some embodiments, please refer to Figure 3 The orthographic projection of the fixing member 150 onto the plane of the cover plate 300 is C-shaped, so as to press part of the side wall of the first insulating member 160 against the cover plate 300, thereby achieving the stability of the first insulating member 160.

[0043] Furthermore, in some embodiments, please refer to Figure 3 , Figure 4 One end of the first insulating body is used to expose the first pole post 120, while the first insulating top plate 190 is installed at the other end of the first insulating body. Specifically, in this embodiment, the first insulating top plate 190 is installed at the end away from the first pole post 120. On the one hand, this avoids installation inconvenience caused by interference between the first insulating top plate 190 and the first pole post 120. On the other hand, it ensures a larger contact area between the first insulating top plate 190 and the conductive element 140, thereby ensuring a better pressing effect of the first insulating top plate 190 on the conductive element 140.

[0044] In some embodiments, the conductive element 140 is provided with a first groove (not shown in the figure), which is configured to accommodate the flipping element 130; wherein the depth of the first groove is 0.2 mm to 0.4 mm. Specifically, when the battery cell is in an abnormal state, the flipping element 130 can be accommodated in the first groove to make the electrical connection between the two more stable. In addition, setting the depth of the first groove to 0.2 mm to 0.4 mm can, on the one hand, avoid the difficulty in forming the first groove if the depth is too small, and on the other hand, ensure that the conductive element 140 and the flipping element 130 are not easily melted when electrically connected.

[0045] In some embodiments, please refer to Figure 5When the battery cell is in a normal state, the distance D between the flipper 130 and the conductive element 140 in the thickness direction of the top cover assembly 100 is 0.1 mm to 0.7 mm. Specifically, setting the distance D between the flipper 130 and the conductive element 140 in the thickness direction of the top cover assembly 100 within the above range can, on the one hand, prevent the flipper 130 from contacting the conductive element 140 when the battery cell is in a normal state if the distance D is too small, and on the other hand, prevent the flipper 130 from contacting the conductive element 140 when the battery cell is in an abnormal state if the distance D is too large.

[0046] In some embodiments, please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of the first current collector 110 provided in this embodiment of the present invention. The first current collector 110 includes a main body 200, a fusible portion 210, and a fixing portion 220. The fusible portion 210 is connected between the main body 200 and the fixing portion 220. The main body 200 is configured to connect to the first terminal post 120. A second groove 230 is formed at the end of the first current collector 110 away from the main body 200. The second groove 230 is configured to cooperate with the edge of the first current collector 110 to form the fusible portion 210. When the battery cell is in an abnormal state, the fusible portion 210 of the first current collector melts, thereby disconnecting the charging circuit of the battery cell.

[0047] In some embodiments, please refer to Figure 7 , Figure 7 This is a schematic diagram of another first current collector provided in this embodiment of the present invention. The first current collector 110 includes a main body 200, a fusing part 210, and a fixing part 220. A slot 240 is formed between the main body 200 and the fixing part 220. The portion of the first current collector 110 located between the slot 240 and the edge of the first current collector 110 forms the fusing part 210. Specifically, the first current collector 110 provided in this embodiment has a slot 240. When the battery cell is in an abnormal state, the fusing part 210 formed by the portion of the first current collector 110 located between the slot 240 and the edge of the first current collector 110 melts. Since the fixing part 220 provided in this embodiment has a large area, it can be applied to application scenarios with large current.

[0048] This invention provides a top cover assembly 100, which includes a cover plate 300, a first current collector 110, a first terminal post 120, and a flip-top component 130. The first current collector 110 is electrically connected to multiple first terminals of the electrode assembly of the battery cell. The first terminal post 120 is electrically connected to the first current collector 110. The flip-top component 130 is electrically connected to the first terminal post 120 and the cover plate 300 in a first state, and disconnects the electrical connection between the first terminal post 120 and the cover plate 300 in a second state. When the battery cell is in an abnormal state, the flip-top component 130 is configured to be in the first state, so that the first current collector is electrically connected to the cover plate 300 through the first terminal post 120 and the flip-top component 130, thereby causing the first current collector to melt. The top cover assembly 100 provided by this invention can quickly cut off the charging circuit when the battery cell is in an abnormal state, avoiding safety problems such as thermal runaway and explosion caused by continuous charging of the battery in an abnormal state.

[0049] This utility model also provides a battery cell, which includes the top cover assembly 100 described above and has all the advantages of the top cover assembly 100 described above, which will not be repeated here.

[0050] This utility model also provides a battery pack, which includes the above-mentioned battery cells and has all the advantages of the above-mentioned battery cells, which will not be repeated here.

[0051] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A top cover assembly for a battery cell, characterized in that, include: Cover plate; A first current collector is adapted to be electrically connected to a plurality of first electrodes in the electrode assembly of the battery cell; The first electrode post is electrically connected to the first current collector; as well as The flip-up component is adapted to electrically connect the first pole and the cover plate in a first state and disconnect the electrical connection between the first pole and the cover plate in a second state. When the battery cell is in an abnormal state, the flipping component is configured to be in the first state, so that the first current collector is electrically connected to the cover plate through the first terminal and the flipping component, so that the first current collector is melted.

2. The top cover assembly according to claim 1, characterized in that, It also includes a conductive element and a fixing element, wherein the flipping element is adapted to be electrically connected to the first pole post through the conductive element in the first state; wherein the fixing element fixes the conductive element to the cover plate.

3. The top cover assembly according to claim 2, characterized in that, It also includes a first insulating element, on which the conductive element is mounted; wherein the fixing element fixes the first insulating element to the cover plate.

4. The top cover assembly according to claim 3, characterized in that, The first insulating member includes a first insulating body, the first insulating body is provided with an insulating pressing part, and the fixing member includes a fixing pressing part, the fixing pressing part pressing against the insulating pressing part towards the cover plate.

5. The top cover assembly according to claim 3, characterized in that, The first insulating element includes a first insulating body, one end of which is adapted to mount the first pole post, wherein the fixing element fixes the other end of the first insulating body to the cover plate.

6. The top cover assembly according to claim 3, characterized in that, The first insulating element includes a first insulating body and a first insulating top plate. The first insulating body has a mounting cavity for mounting the conductive element, and the first insulating top plate is mounted on the first insulating body to press against the conductive element.

7. The top cover assembly according to claim 6, characterized in that, One end of the first insulating body is adapted to expose the first pole post, wherein the first insulating top plate is mounted at the other end of the first insulating body.

8. The top cover assembly according to claim 2, characterized in that, The conductive component is provided with a first groove, which is configured to accommodate the flipping component; wherein the depth of the first groove is 0.2 mm to 0.4 mm.

9. The top cover assembly according to claim 1, characterized in that, It also includes a conductive element, the flipping element being adapted to be electrically connected to the first electrode post through the conductive element in the first state, and when the battery cell is in a normal state, the distance between the flipping element and the conductive element in the thickness direction of the top cover assembly is 0.1 mm to 0.7 mm.

10. The top cover assembly according to claim 1, characterized in that, The first current collector includes a main body, a fusible part, and a fixing part. The fusible part is connected between the main body and the fixing part. The main body is configured to connect to the pole post. A second groove is provided at one end of the first current collector away from the main body. The second groove is configured to cooperate with the edge of the first current collector to form the fusible part.

11. The top cover assembly according to claim 1, characterized in that, The first current collector includes a main body, a fusible part, and a fixing part. A slot is provided between the main body and the fixing part. The portion of the first current collector located between the slot and the edge of the first current collector forms the fusible part.

12. A single battery cell, characterized in that, Includes the top cover assembly as described in any one of claims 1-11.

13. A battery pack, characterized in that, Includes the battery cell as described in claim 12.

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