Cover plate structure, battery case, battery cell, battery pack, and electric device

Abstract

The application provides a cover plate structure, a battery shell, a battery monomer, a battery pack and an electric device. The cover plate structure comprises a cover plate body, a cover cap and at least one pole column assembly. The cover plate body is suitable for being connected with a shell of a battery monomer. The cover plate body has a first communication port which penetrates the cover plate body along the thickness direction of the cover plate body; the first communication port is used for extending the tab of a pole core to the side of the cover plate body away from the shell; the cover cap is connected to the side of the cover plate body away from the shell and covers the first communication port; the cover cap protrudes from the cover plate body and forms a second accommodating cavity together with the cover plate body. The at least one pole column assembly comprises a first pole column and a second pole column; the first pole column and the second pole column are connected to the cover plate body at the opposite sides of the cover cap; and the tab is electrically connected with the first pole column and the second pole column respectively. The application can reduce the heat production of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a cover plate structure, battery casing, battery cell, battery pack and electrical equipment. Background Technology

[0002] Battery cells are a key technology for the future development of new energy storage due to their advantages such as high energy density, fast charging and discharging, fast response speed, flexible configuration, and short construction cycle. A battery cell typically includes a casing with a housing space and a cover plate. The cover plate is connected to the casing and seals the space. Electrode assemblies are installed within the housing space. The tabs of the electrode assemblies are connected to the terminals of the cover plate through leads to achieve electrical connection between the battery cell and the external structure.

[0003] In related technologies, an unreasonable arrangement of the tabs and terminals leads to excessive heat generation in the battery cells, which in turn reduces the safety performance of the battery cells. Utility Model Content

[0004] In view of the above problems, embodiments of this application provide a cover structure, a battery casing, a battery cell, a battery pack, and an electrical device, which can reduce the heat generation of the battery cell and improve the safety performance of the battery cell.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a cover plate structure, including:

[0007] A cover plate body adapted to be connected to the outer casing of a battery cell, the cover plate body having a first through-hole extending along its thickness direction, the first through-hole being used for the tabs of the electrode core to extend to the side of the cover plate body opposite to the outer casing.

[0008] A cap is attached to the side of the cover plate body opposite to the outer shell and seals the first communication opening; wherein the cap protrudes from the cover plate body and forms a second receiving cavity with the cover plate body;

[0009] At least one pole assembly, the at least one pole assembly including a first pole and a second pole, the first pole and the second pole being connected to the cover plate body and located on opposite sides of the cap, wherein the tabs located in the second receiving cavity are electrically connected to the first pole and the second pole respectively.

[0010] In one possible implementation, the first pole and the second pole are disposed opposite to each other on both sides of the cap in a direction perpendicular to the thickness of the cap body.

[0011] In one possible implementation, the cover plate structure further includes at least one lead-out member, the number of which corresponds to the number of the at least one pole post assembly;

[0012] The tab of the electrode core is electrically connected to the corresponding electrode post assembly through the lead-out member, and the connection position of the lead-out member and the tab is located in the second receiving cavity.

[0013] In one possible implementation, the lead-out component includes a first lead-out component and a second lead-out component; one end of the first lead-out component is connected to the tab, and the other end of the first lead-out component is connected to the first electrode post; one end of the second lead-out component is connected to the tab, and the other end of the second lead-out component is connected to the second electrode post.

[0014] In one possible implementation, both the first lead-out member and the second lead-out member include a base and at least one protrusion, the at least one protrusion being connected to the base and located on the side of the base facing the cap;

[0015] The substrate is connected to the corresponding pole post, and the at least one protrusion is connected to the tab of the pole core.

[0016] In one possible implementation, the protrusion is recessed in a direction toward the center of the substrate in a direction perpendicular to the thickness of the cover plate body, so that the protrusion and the substrate enclose a receiving area.

[0017] In one possible implementation, there is a gap between the first lead-out member and the second lead-out member in a direction perpendicular to the thickness of the cover plate body;

[0018] And / or, in the thickness direction perpendicular to the cover plate body, there is a gap between the first lead-out member and the second lead-out member, the gap being greater than or equal to 1 mm and less than or equal to 50 mm.

[0019] In one possible implementation, the substrate is provided with an exhaust port, which communicates with the first receiving cavity of the outer shell.

[0020] In one possible implementation, the cap is provided with an explosion-proof valve, which is offset from the first center line of the cap and at least partially opposite the vent hole; wherein the first center line is perpendicular to the extension direction of the cap.

[0021] Secondly, an embodiment of this application provides a battery casing, including an outer shell and the cover structure described in the first aspect; the cover structure is connected to the outer shell and seals the first receiving cavity of the outer shell.

[0022] In one possible implementation, the battery housing further includes an insulating member having a second communication port, the insulating member being disposed on the side of the cover structure facing the outer casing and connected to the outer casing;

[0023] The second connection port is used for the insertion of the electrode tabs of the electrode core.

[0024] In one possible implementation, the outer casing includes a first opening and a second opening disposed opposite to each other, and there are two cover plate structures, one of which is connected to the outer casing and seals the first opening, and the cover plate structure serves as a positive electrode cover plate structure.

[0025] Another cover structure is connected to the outer casing and seals the second opening, and this cover structure serves as a negative electrode cover structure.

[0026] Thirdly, embodiments of this application provide a battery cell, including at least one electrode core and the battery casing described in the second aspect, wherein the at least one electrode core is disposed within the battery casing.

[0027] Fourthly, embodiments of this application provide a battery pack including at least one battery cell as described in the third aspect.

[0028] Fifthly, embodiments of this application provide an electrical device, including an electrical appliance and a battery pack as described in the fourth aspect, wherein the battery pack is electrically connected to the electrical appliance and is used to provide electrical energy to the electrical appliance; or,

[0029] It includes an electrical device and the battery cell described in the third aspect, wherein the battery cell is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

[0030] This application provides a cover structure, battery casing, battery cell, battery pack, and electrical device in which the number of terminals is increased. For example, each terminal assembly includes a first terminal and a second terminal, and the first and second terminals are located on opposite sides of the cover. The tabs of the electrode core are connected to the first and second terminals respectively. In this way, the current transmitted through the tabs can be transmitted in different directions, which can shorten the current path length from the tab to each terminal and reduce the internal impedance of the battery cell. This reduces the heat generated by the battery cell, improves the safety performance of the battery cell, and reduces the safety risks caused by overheating.

[0031] In addition, the first and second terminals work together to carry out current transmission, which helps to achieve a more balanced current distribution and improve the overall performance and stability of the battery cell.

[0032] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the cover plate structure, battery casing, battery cell, battery pack, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation methods. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 An exploded view of a single battery cell from a certain angle, as provided in an embodiment of this application;

[0035] Figure 2 An exploded view of a single battery cell from another angle, as provided in an embodiment of this application.

[0036] Figure 3 A perspective view of a single battery cell provided in an embodiment of this application;

[0037] Figure 4 This is a front view of a battery cell provided in an embodiment of this application;

[0038] Figure 5 A left view of a battery cell provided in an embodiment of this application;

[0039] Figure 6 Right view of a battery cell provided in an embodiment of this application;

[0040] Figure 7 A perspective view of the lead-out provided in an embodiment of this application;

[0041] Figure 8 A front view of the lead-out provided in an embodiment of this application;

[0042] Figure 9 This is a partial schematic diagram of the lead-out provided in an embodiment of this application;

[0043] Figure 10 This is a schematic diagram of a battery pack provided in an embodiment of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1: Battery pack;

[0046] 10: Battery cell; 20: Wiring harness;

[0047] 100: Battery casing;

[0048] 110: Cover plate structure;

[0049] 111: Cover plate body; 1111: First connecting port;

[0050] 112: Block;

[0051] 113: Terminal assembly; 1131: First terminal; 1132: Second terminal;

[0052] 114: Lead-out component; 1141: First lead-out component; 1142: Second lead-out component; 1143: Base; 1144: Protrusion; 1145: Gap; 1146: Vent hole;

[0053] 115: Explosion-proof valve;

[0054] 120: Outer shell; 121: First receiving cavity;

[0055] 130: Insulating component; 131: Second communication port;

[0056] 200: Core; 210: Tab;

[0057] 300: Insulating film. Detailed Implementation

[0058] As described in the background art, the problem of excessive heat generation in battery cells in related technologies is caused by the fact that the number of terminals in related technologies is relatively small, usually only one terminal, and the distance between the terminal and the tab is relatively large, resulting in a long current path, which in turn causes high impedance and severe heat generation, reducing the safety performance of the battery cell.

[0059] To address the aforementioned technical problems, embodiments of this application provide a cover structure, a battery casing, a battery cell, a battery pack, and an electrical device. By increasing the number of terminals, for example, each terminal assembly includes a first terminal and a second terminal, with the first and second terminals located on opposite sides of the cover, and the tabs of the electrode core connected to the first and second terminals respectively. This allows the current transmitted through the tabs to travel in different directions, shortening the current path length from the tab to each terminal and reducing the internal impedance of the battery cell. This, in turn, reduces the heat generated by the battery cell, improves its safety performance, and lowers the safety risks caused by overheating.

[0060] In addition, the first and second terminals work together to carry out current transmission, which helps to achieve a more balanced current distribution and improve the overall performance and stability of the battery cell.

[0061] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0062] Please refer to Figure 1 and Figure 2 This application provides a cover structure 110, which is adapted to be connected to the outer casing 120 of a battery cell 10. Exemplarily, the outer casing 120 includes at least one opening, and the cover structure 110 is welded to the outer casing 120 to seal the corresponding opening. For example, the outer casing 120 includes a first opening and a second opening disposed opposite to each other. Accordingly, there are two cover structures 110, one of which seals the first opening and the other seals the second opening. One cover structure 110 is used for electrical connection with the positive electrode tab of the electrode core 200 of the battery cell 10, and the other cover structure 110 is used for electrical connection with the negative electrode tab of the electrode core 200 of the battery cell 10. It should be noted that the first receiving cavity 121 of the outer casing 120 of the battery cell 10 is adapted to install the electrode core 200.

[0063] The cover structure 110 includes a cover body 111, which is adapted to be connected to the outer casing 120 of the battery cell 10. The cover body 111 may be made of metal to ensure the structural strength of the cover body 111.

[0064] The cover plate body 111 has a first connecting port 1111, which extends through the cover plate body 111 along its thickness direction. The electrode tab 210 of the electrode core 200 extends through the first connecting port 1111 to the side of the cover plate body 111 opposite to the outer shell 120, for electrical connection with the electrode post assembly 113 of the cover plate structure 110.

[0065] The cover structure 110 also includes a cap 112, which is connected to the side of the cover body 111 facing away from the outer shell 120 and covers the first communication opening 1111. Exemplarily, the cap 112 can be connected to the cover body 111 by welding or bonding. The welding process can include laser welding, ultrasonic welding, and pulse welding; preferably, laser welding is used.

[0066] The cap 112 protrudes from the cover plate body 111 and forms a second receiving cavity with the cover plate body 111. The second receiving cavity is connected to the first receiving cavity 121 through the first connecting port 1111.

[0067] In some embodiments, the cap 112 includes a top plate and a side plate, the top plate being connected to the side plate. The end of the side plate facing away from the top plate is bent in a direction away from the second receiving cavity to form a bent portion. Thus, the bent portion of the cap 112 is fixedly connected to the cover plate body 111 by welding, and together with the cover plate body 111, forms the second receiving cavity. Furthermore, this embodiment improves the ease of connection between the cap 112 and the cover plate body 111 by welding the bent portion to the cover plate body 111.

[0068] Please refer to Figure 3 and Figure 4 The cover plate structure 110 also includes at least one pole post assembly 113.

[0069] At least one pole assembly 113 includes a first pole 1131 and a second pole 1132, the first pole 1131 and the second pole 1132 are connected to the cover plate body 111 and are located on the opposite side of the cap 112, wherein the pole tab 210 located in the second receiving cavity is connected to the first pole 1131 and the second pole 1132 respectively.

[0070] It is important to understand that the first pole 1131 and the second pole 1132 are located on opposite sides of the cap 112. This can be understood as the line connecting the first pole 1131 and the second pole 1132 being parallel to the length direction of the cap body 111. Alternatively, it can be understood that the line connecting the first pole 1131 and the second pole 1132 is not a straight line. Figure 3 Taking the orientation shown as an example, the first pole post 1131 can be located on the upper side of the cap 112, and the second pole post 1132 can be located on the right side of the cap 112.

[0071] With this configuration, the current transmitted by the tab 210 can be transmitted in different directions (e.g., by...). Figure 1 Taking the orientation shown as an example, the current transmitted by the tab 210 can be transmitted upwards through the upper first terminal 1131 to the outside, or it can be transmitted downwards through the lower second terminal 1132 to the outside. This shortens the current path length from the tab 210 to each terminal and reduces the internal impedance of the battery cell 10, thereby reducing the heat generated by the battery cell 10, improving the safety performance of the battery cell 10, and reducing the safety risks caused by overheating.

[0072] In addition, the first electrode post 1131 and the second electrode post 1132 jointly undertake the task of current transmission, which helps to achieve a more balanced current distribution and improve the overall performance and stability of the battery cell 10.

[0073] In this embodiment, the tab 210 extends through the first connecting port 1111 into the second receiving cavity, which can improve the space utilization rate inside the housing 120. At the same time, it makes full use of the external space of the pole assembly, improving the space utilization rate without affecting the volume of the battery cell 10.

[0074] In one possible implementation, the first pole post 1131 and the second pole post 1132 are disposed opposite each other on both sides of the cap 112 in a direction perpendicular to the thickness of the cover body 111. Taking a rectangular cover body 111 as an example, the direction perpendicular to the thickness of the cover body 111 can be the length direction of the cover body 111 (such as...). Figure 1 and Figure 7 (in the Z direction), or it can be the width direction of the cover body 111 (such as...) Figure 1 and Figure 7 (in the Y direction). Figures 1 to 3 Taking the orientation shown as an example, the first pole 1131 and the second pole 1132 are located on the upper and lower sides of the cap 112, respectively. In this way, the transmission path of the current transmitted by the tab 210 can include transmission from the middle of the tab 210 to the upper and lower sides, respectively, and to the first pole 1131 and the second pole 1132, forming two transmission paths.

[0075] Compared to related technologies that only have one pole (such as only having the first pole 1131), the area of ​​the tab 210 that is far from the first pole 1131 is much larger, resulting in a longer current transmission path.

[0076] Therefore, by placing the first electrode post 1131 and the second electrode post 1132 opposite to each other on both sides of the cap 112, this embodiment can significantly shorten the transmission path of the current transmitted by the tab 210, thereby reducing the internal resistance of the battery cell 10, reducing energy loss and heat generation, and improving the energy conversion efficiency and safety performance of the battery cell 10.

[0077] It should be noted that the connection between the pole post and the tab 210 can be a direct connection or an indirect connection.

[0078] In one possible implementation, please refer to Figure 1 and Figure 7 The cover structure 110 also includes at least one lead-out 114, the number of which corresponds to the number of at least one pole post assembly 113.

[0079] The tab 210 of the core 200 is electrically connected to the corresponding pole assembly 113 via the lead-out member 114, and the connection position of the lead-out member 114 and the tab 210 is located in the second receiving cavity, so that both the tab 210 and the lead-out member 114 can be stretched to the outside of the housing 120 to improve the space utilization rate inside the housing 120.

[0080] In this embodiment, the lead-out member 114 serves as an independent conductive component, providing a large-area and high-strength connection interface between the tab 210 and the terminal post. This interface can more effectively resist the stress caused by vibration and impact during the use of the battery cell 10, prevent the connection point from loosening or breaking, and greatly improve the long-term reliability and service life of the battery cell.

[0081] In addition, the tab 210 and lead-out piece 114, and the lead-out piece 114 and pole piece can be welded at the most suitable work station (such as ultrasonic welding or laser welding), which ensures the consistency and stability of welding quality, makes it easier to achieve automated production, and reduces manufacturing costs.

[0082] It should be understood that in this embodiment, the lead-out member 114 can be a single integral structure or a separate structure. When the lead-out member 114 is a single integral structure, its fabrication is convenient. When the lead-out member 114 is a separate structure, it facilitates connection with the corresponding electrode post.

[0083] Please refer to Figure 7 and Figure 9 In some embodiments, the lead-out member 114 includes a first lead-out member 1141 and a second lead-out member 1142. One end of the first lead-out member 1141 is connected to the tab 210, and the other end of the first lead-out member 1141 is connected to the first terminal post 1131; one end of the second lead-out member 1142 is connected to the tab 210, and the other end of the second lead-out member 1142 is connected to the second terminal post 1132. In this embodiment, the lead-out member 114 is not a single piece, but rather a separate component comprising a first lead-out member 1141 and a second lead-out member 1142. During the welding assembly process, the first lead-out member 1141 can be first positioned and welded to the first terminal post 1131, and then the second lead-out member 1142 can be positioned and welded to the second terminal post 1132. This ensures the accuracy of the relative positions between the terminal post, the lead-out member, and the tab, fundamentally reducing internal mechanical stress caused by assembly deviations and improving the yield and consistency of the battery cell 10.

[0084] Furthermore, the current transmitted through the tab 210 can be transmitted to the first terminal 1131 via the first lead 1141, and to the second terminal 1132 via the second lead 1142, forming two transmission paths. Compared to related technologies where the current transmitted through the tab 210 has only one transmission path, this significantly shortens the potentially long-distance transmission portion on a single path, thereby reducing resistive losses and reactive impedance caused by path factors during current transmission, resulting in a significant reduction in overall impedance. In addition, it also reduces heat generation caused by path factors during current transmission.

[0085] In some embodiments, both the first lead-out member 1141 and the second lead-out member 1142 include a base 1143 and at least one protrusion 1144, the at least one protrusion 1144 being connected to the base 1143 and located on the side of the base 1143 facing the cap 112. The at least one protrusion 1144 extends toward the cap 112 and is located within the second receiving cavity.

[0086] The base 1143 is connected to the corresponding pole post, and at least one protrusion 1144 is connected to the tab 210 of the pole core 200. Exemplarily, the base 1143 of the first lead-out 1141 is connected to the first pole post 1131, and the base 1143 of the second lead-out 1142 is connected to the second pole post 1132. For example, the base 1143 of the first lead-out 1141 is provided with a connecting hole, one end of the first pole post 1131 is inserted into the connecting hole, and the first lead-out 1141 and the first pole post 1131 are fixedly connected by a welding process.

[0087] It should be understood that the number of protrusions 1144 can be matched with the number of pole cores 200. For example, when there are two pole cores 200, there are also two protrusions 1144. This ensures that each pole core 200 can be effectively electrically connected to an external conductive component.

[0088] In addition, at least one protrusion 1144 is perpendicular to the base 1143 and the protrusion 1144 is parallel to the tab 210 to improve the ease of welding and the stability of welding between the protrusion 1144 and the tab 210.

[0089] Please refer to Figure 7In one possible implementation, in the thickness direction perpendicular to the cover plate body 111, the protrusion 1144 is recessed towards the center of the base 1143, forming a receiving area between the protrusion 1144 and the base 1143. Thus, the tab 210 of the electrode core 200 can pass through the first connecting port 1111 into the receiving area and be welded to the surface of the protrusion 1144 facing the receiving area, improving the ease of connection between the protrusion 1144 and the tab 210. In this embodiment, the direction perpendicular to the thickness of the cover plate body 111 can be the width direction of the cover plate body 111.

[0090] Please refer to Figure 8 A gap 1145 exists between the first lead-out member 1141 and the second lead-out member 1142 in the direction perpendicular to the thickness of the cover plate body 111. This allows for the adjustment of assembly tolerances between the lead-out members and their corresponding terminals. For example, the presence of this gap 1145 can effectively absorb and compensate for these assembly tolerances, preventing deformation or damage to the lead-out members or terminals due to excessive tightness in assembly, thereby avoiding affecting the integrity of the battery cell 10 and the stability of the electrical connection; at the same time, it can also prevent problems such as poor contact and increased resistance caused by excessively loose assembly.

[0091] And / or, in the thickness direction perpendicular to the cover plate body 111, there is a gap 1145 between the first lead-out member 1141 and the second lead-out member 1142, the gap 1145 being greater than or equal to 1 mm and less than or equal to 50 mm.

[0092] When the gap 1145 is greater than or equal to 1mm and less than or equal to 50mm, it can ensure that there is a sufficiently large size to better meet the adjustment of the assembly tolerance between the lead and the corresponding terminal. The assembly tolerance between the terminal and the lead is relaxed to ±0.3mm. It can also avoid the gap 1145 being too large, thus avoiding the failure of the drainage of the vent holes formed on the substrate. It also avoids the possibility of tearing during the welding process between the lead and the electrode, thereby improving the performance and yield of the battery cell 10 and increasing the yield to over 95%.

[0093] It should be noted that the structural feature of a gap 1145 between the first lead-out member 1141 and the second lead-out member 1142 in the extending direction of the cap 112 itself can achieve the technical effect of absorbing and compensating for assembly tolerances and avoiding a series of problems caused by excessively tight or loose assembly. Those skilled in the art will understand that by reasonably setting this gap, the necessary tolerance space can be provided for the assembly of the pole post and the lead-out member.

[0094] The aforementioned limitation of the gap 1145 size range to be greater than or equal to 1 mm and less than or equal to 50 mm is a further optimization of the basic scheme with the gap described above. This preferred size range can further avoid risks such as current-draining failure or welding tearing that may be caused by excessive gaps, while ensuring effective tolerance adjustment, thereby significantly improving the production yield of battery cells to over 95%.

[0095] Please refer to Figure 7 and Figure 9 The substrate 1143 is provided with an exhaust port 1146, which connects to the first receiving cavity 121 of the outer casing 120, so that the exhaust port 1146 serves as a gas discharge channel. Thus, when thermal runaway gas is generated in the electrode core 200 during operation, the thermal runaway gas is discharged to the outside of the outer casing 120 through the exhaust port 1146, improving the performance and safety of the battery cell 10. At the same time, it can also increase the current carrying capacity of the battery cell 10, improving the charging rate and performance of the battery cell 10.

[0096] The diameter of the exhaust port 1146 is 5mm-80mm. For example, the diameter of the exhaust port 1146 is a value within the range of 5mm, 20mm, 40mm, 60mm, 80mm, and any two values. This can improve the smoothness of gas discharge.

[0097] Please refer to Figure 5 and Figure 6 An explosion-proof valve 115 is provided on the cap 112. The explosion-proof valve 115 is offset from the first center line L1 of the cap 112 and is at least partially opposite to the vent 1146. The first center line L1 is perpendicular to the extension direction of the cap 112. In other words, the first center line L1 is a center line extending along the width direction of the battery cell 10.

[0098] In this way, when the battery cell 10 produces gas, it can be smoothly discharged through the vent 1146, thereby improving the performance and safety of the battery cell 10.

[0099] Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, this application embodiment also provides a battery housing 100, including an outer shell 120 and a cover structure 110 described in any of the above embodiments, wherein the cover structure 110 is connected to the outer shell 120 and covers the first receiving cavity 121 of the outer shell 120.

[0100] It should be noted that the number of cover plate structures 110 can be one or two. The cover plate structure 110 described in any of the above embodiments can serve as the cover plate structure for the positive electrode of the battery casing 100, or as the cover plate structure for the negative electrode of the battery casing 100, or simultaneously as the cover plate structure for the positive electrode of the battery casing 100 (such as...). Figure 2 and Figure 6 (as shown) and the cover structure of the negative electrode (such as Figure 1 and Figure 5 (As shown).

[0101] For example, the housing 120 includes a first opening and a second opening disposed opposite to each other, and correspondingly, there are two cover structures 110. One cover structure 110 is connected to the housing 120 and covers the first opening, and this cover structure 110 serves as the positive electrode cover structure; the other cover structure 110 is connected to the housing 120 and covers the second opening, and this cover structure 110 serves as the negative electrode cover structure. This arrangement, from both the positive and negative electrode cover structures, shortens the current path from the positive electrode tab to each positive electrode post and from the negative electrode tab to each negative electrode post, thereby minimizing the internal impedance of the battery cell and reducing the heat generated by the battery cell.

[0102] When the cover structure 110 serves as both a positive and negative cover structure, the explosion-proof valves 115 of the positive and negative cover structures are arranged opposite each other along the length of the battery casing 100. This maximizes the space utilization within the battery casing 100. For one possible implementation, please refer to... Figure 1 and Figure 2 The battery housing 100 also includes an insulating member 130 having a second communication port 131. The insulating member 130 is disposed on the side of the lead-out member 114 of the cover structure 110 facing the outer casing 120 and is connected to the outer casing 120. The second communication port 131 is used for the tab 210 of the electrode core 200 to pass through.

[0103] This avoids electrical connection between the cover structure 110 and other conductive components of the electrode core 200 besides the tab 210, thus improving the yield and safety of the battery cell 10.

[0104] Please continue to refer to this. Figure 1 and Figure 2This application also provides a battery cell 10. The battery cell 10 includes at least one electrode core 200 and a battery casing 100. The at least one electrode core 200 is disposed within the battery casing 100, and the tabs 210 of the electrode core 200 are connected to the terminal post assembly 113 of the cover plate structure 110. In this application embodiment, the tabs 210 of the electrode core 200 can extend to the outside of the casing 120, improving the space utilization rate within the casing 120. At the same time, it fully utilizes the external space of the terminal post assembly, improving space utilization without affecting the volume of the battery cell 10.

[0105] It should be understood that the number of pole cores 200 can be one or more. For example, the number of pole cores 200 is two, and in this case, the number of protrusions 1144 of the lead-out member 114 in the cover plate structure 110 is two, corresponding to the number of pole cores 200.

[0106] Please continue to refer to this. Figure 1 and Figure 2 An insulating film 300 is provided between the electrode core 200 and the battery casing 100. This can prevent unnecessary areas of the electrode core 200 from short-circuiting with the outer shell 120 of the battery casing 100, thereby improving the safety of the battery cell 10.

[0107] In addition, when there are two pole cores 200, two insulating films 300 are required, and both insulating films 300 are U-shaped. One insulating film 300 covers the side, bottom and top surfaces of one pole core 200, and the other insulating film 300 covers the side, bottom and top surfaces of the other pole core 200, so as to ensure that each pole core 200 is covered by an insulating film 300.

[0108] In this embodiment, the electrode core 200 can be stacked in a lamination and roll-up manner, preferably in a lamination manner. The electrode core 200 includes a positive electrode sheet, a separator, and a negative electrode sheet stacked together. The positive current collector and positive electrode tab of the positive electrode sheet are made of aluminum, the negative current collector and negative electrode tab of the negative electrode sheet are made of copper or aluminum, and the separator is made of PP / PE or other organic polymers.

[0109] The negative electrode tab can be located on one side of the electrode core 200, and the positive electrode tab can be located on the other side of the electrode core 200. Figure 1Taking the structure shown as an example, the negative electrode tab is located on the left side of the electrode core 200, and the positive electrode tab is located on the right side of the electrode core 200. Taking the negative electrode tab as an example, the negative electrode tab extends to the outside of the cover plate body through the first connecting port of the cover plate body and is connected to the lead-out member 114. For example, any method such as laser welding, ultrasonic welding, pulse welding, or adhesive bonding can be used to connect the negative electrode tab and the lead-out member 114. Preferably, bonding methods such as laser / ultrasonic welding can improve the stability of the connection between the negative electrode tab and the lead-out member 114.

[0110] It should be noted that there can be one or more electrodes.

[0111] Please refer to Figure 10 This application provides a battery pack 1, including at least one battery cell 10 as described in any of the above embodiments. Since the battery pack 1 includes the battery cell 10 as described in any of the above embodiments, it possesses all the structure and all the beneficial effects of the battery cell 10.

[0112] When there are multiple battery cells 10, the multiple battery cells 10 are arranged sequentially along the first direction. Taking a rectangular battery cell 10 as an example, the first direction can be the width direction of the battery cell 10 or the length direction of the battery cell 10.

[0113] The battery pack 1 also includes a wiring harness 20 extending along a first direction, located on one side of the explosion-proof valve 115 of the battery pack 1. Alternatively, the wiring harness 20 is offset from the explosion-proof valve 115. It should be noted that the wiring harness 20 can be used to collect temperature / current / voltage data of the individual battery cells 10.

[0114] Therefore, in this embodiment, the explosion-proof valve 115 of the battery cell 10 is offset from the center of the battery cell 10. This ensures that the wiring harness 20 does not overlap with the explosion-proof valve 115 when the wiring harness 20 is arranged, thus preventing interference between the explosion-proof valve 115 and the wiring harness 20. When the battery cell 10 generates gas, the gas is discharged through the vent and the explosion-proof valve, avoiding blockage of the venting path and improving the safety of the battery pack 1.

[0115] This application also provides an electrical device, including an electrical device and a battery pack 1 as described in any of the above embodiments. The battery pack 1 is electrically connected to the electrical device and is used to provide electrical energy to the electrical device. Alternatively, the electrical device includes an electrical device and a battery cell 10 as described in any of the above embodiments. The battery cell 10 is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

[0116] The electrical equipment in this embodiment can be a vehicle, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. Correspondingly, the electrical device can be the vehicle's drive mechanism or its control system. Furthermore, the electrical equipment can also be other energy storage devices, such as an energy storage power station.

[0117] Given that the electrical equipment in this embodiment includes the battery cell or battery pack described in any of the above embodiments, the structure and beneficial effects of the electrical equipment including the battery cell or battery pack will not be described in detail here.

[0118] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0119] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover plate structure (110), characterized in that, include: A cover body (111) adapted to be connected to the outer casing (120) of a battery cell (10), the cover body (111) having a first through-hole (1111) extending through its thickness direction, the first through-hole (1111) being used for the tab (210) of the electrode core (200) to extend to the side of the cover body (111) away from the outer casing (120); A cap (112) is connected to the side of the cover plate body (111) away from the outer shell (120) and seals the first communication opening (1111); wherein the cap (112) protrudes from the cover plate body (111) and forms a second receiving cavity with the cover plate body (111); At least one pole assembly (113) includes a first pole (1131) and a second pole (1132), the first pole (1131) and the second pole (1132) being connected to the cover body (111) and located on the opposite side of the cap (112), wherein the tab (210) located in the second receiving cavity is electrically connected to the first pole (1131) and the second pole (1132) respectively.

2. The cover plate structure (110) according to claim 1, characterized in that, In the thickness direction perpendicular to the cover plate body (111), the first pole post (1131) and the second pole post (1132) are disposed opposite to each other on both sides of the cap (112).

3. The cover plate structure (110) according to claim 1, characterized in that, The cover plate structure (110) also includes at least one lead-out member (114), the number of which corresponds to the number of the at least one pole post assembly (113); The tab (210) of the electrode core (200) is electrically connected to the corresponding electrode post assembly (113) through the lead-out member (114), and the connection position of the lead-out member (114) and the tab (210) is located in the second receiving cavity.

4. The cover plate structure (110) according to claim 3, characterized in that, The lead-out member (114) includes a first lead-out member (1141) and a second lead-out member (1142); one end of the first lead-out member (1141) is connected to the tab (210), and the other end of the first lead-out member (1141) is connected to the first pole post (1131); one end of the second lead-out member (1142) is connected to the tab (210), and the other end of the second lead-out member (1142) is connected to the second pole post (1132).

5. The cover plate structure (110) according to claim 4, characterized in that, Both the first lead-out member (1141) and the second lead-out member (1142) include a base (1143) and at least one protrusion (1144), the at least one protrusion (1144) being connected to the base (1143) and located on the side of the base (1143) facing the cap (112); The substrate (1143) is connected to the corresponding pole post, and the at least one protrusion (1144) is connected to the tab (210) of the pole core (200).

6. The cover plate structure (110) according to claim 5, characterized in that, In the thickness direction perpendicular to the cover body (111), the protrusion (1144) is recessed in the direction toward the center of the base (1143) so that the protrusion (1144) and the base form an accommodating area.

7. The cover plate structure (110) according to any one of claims 4-6, characterized in that, In the thickness direction perpendicular to the cover plate body (111), there is a gap (1145) between the first lead-out member (1141) and the second lead-out member (1142). And / or, in the thickness direction perpendicular to the cover plate body (111), there is a gap (1145) between the first lead-out member (1141) and the second lead-out member (1142), the gap (1145) being greater than or equal to 1 mm and less than or equal to 50 mm.

8. The cover plate structure (110) according to claim 5 or 6, characterized in that, The base (1143) is provided with an exhaust hole (1146), which is connected to the first receiving cavity (121) of the outer shell (120).

9. The cover plate structure (110) according to claim 8, characterized in that, An explosion-proof valve (115) is provided on the cap (112). The explosion-proof valve (115) is offset from the first center line of the cap (112) and is at least partially opposite to the vent (1146). The first center line is perpendicular to the extension direction of the cap (112).

10. A battery casing (100), characterized in that, It includes a housing (120) and a cover structure (110) as described in any one of claims 1-9; the cover structure (110) is connected to the housing (120) and covers the first receiving cavity (121) of the housing (120).

11. The battery casing (100) according to claim 10, characterized in that, The battery housing (100) further includes an insulating member (130) having a second communication port (131), the insulating member (130) being disposed on the side of the lead-out member (114) of the cover structure (110) facing the outer shell (120) and connected to the outer shell (120); The second connection port (131) is used for the tabs (210) of the pole core (200) to pass through.

12. The battery casing (100) according to claim 11, characterized in that, The outer casing (120) includes a first opening and a second opening disposed opposite to each other. There are two cover structures (110), one of which is connected to the outer casing (120) and covers the first opening, and the cover structure (110) serves as a positive electrode cover structure. Another cover structure (110) is connected to the outer casing (120) and covers the second opening, and the cover structure (110) serves as a negative electrode cover structure.

13. A battery cell (10), characterized in that, It includes at least one electrode core (200) and a battery housing (100) as described in any one of claims 10-12, wherein the at least one electrode core (200) is disposed within the battery housing (100).

14. A battery pack (1), characterized in that, It includes at least one battery cell (10) as described in claim 13.

15. An electrical appliance, characterized in that, It includes an electrical device and a battery pack (1) as described in claim 14, wherein the battery pack (1) is electrically connected to the electrical device and is used to provide electrical energy to the electrical device; or, It includes an electrical device and a battery cell (10) as described in claim 13, wherein the battery cell (10) is connected to the electrical device and is used to provide electrical energy to the electrical device.

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