Cover plate assembly, battery monomer and electric device

Abstract

The utility model discloses a kind of cover plate assembly, battery monomer and electric equipment, comprising: cover plate, is equipped with pole connecting hole;First insulating part, be equipped with first insulating hole in the thickness direction of cover plate one side;Second insulating part, be equipped with second insulating hole in the thickness direction of cover plate other side;Pole, through first insulating hole and second insulating hole;Sealing ring, sealing connection cover plate, first insulating part, second insulating part and pole;First conducting part, be equipped with in the one side of first insulating part away from cover plate, connect the one end of pole and project first insulating hole;Second conducting part, be equipped with in the one side of second insulating part away from cover plate, connect the one end of pole and project second insulating hole;Among them, the size of second insulating part, sealing ring, first conducting part and second conducting part along the length direction of cover plate is all greater than along the size of width direction of cover plate.The utility model makes that the overcurrent area of battery pole structure is not limited by battery thickness direction.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a cover plate assembly, a battery cell, and an electrical device. Background Technology

[0002] Since their invention in the 20th century, lithium-ion batteries have seen increasingly widespread application in power and energy storage fields such as electric vehicles and large-scale energy storage systems due to their significant advantages, including high specific energy, long cycle life, and environmental friendliness. A typical lithium-ion battery structure consists of a casing, an electrode assembly housed inside the casing, and a cover assembly for sealing the opening of the casing. The electrode assembly includes an electrode body, tabs connected to the electrode body, and an insulating film covering the electrode body. The cover assembly consists of a cover plate and a lower plastic layer located inside the cover plate. The lower plastic layer is aligned with the cover plate in the thickness direction and has clearance holes corresponding to the terminal connection holes, through which a fixed connection with the terminal unit is achieved.

[0003] The blade battery's cells have a flat, elongated structure, allowing them to bypass modules and directly assemble into a battery pack, significantly improving volume utilization and ultimately achieving the design goal of fitting more cells into the same space. Compared to traditional battery packs, the blade battery improves volume utilization by more than 50%, meaning a range increase of more than 50%. However, due to the blade battery's narrow thickness, using a traditional terminal block structure results in an insufficient current-carrying area. Increasing the current-carrying area of ​​the blade is a crucial technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] Therefore, this utility model provides a cover plate assembly, a battery cell, and an electrical device, which can improve the current flow area of ​​the thin battery terminal structure.

[0005] To solve the above-mentioned technical problems, this utility model provides a cover plate assembly, comprising: The cover plate has a pole connection hole that extends through its thickness direction; A first insulating element is disposed on one side of the cover plate in the thickness direction, and the first insulating element has a first insulating hole that extends through the cover plate in the thickness direction. The second insulating element is disposed on the other side of the cover plate in the thickness direction, and the second insulating element has a second insulating hole that extends through the cover plate in the thickness direction. The pole passes through the first insulating hole and the second insulating hole; A sealing ring is used to seal and connect the cover plate, the first insulating component, the second insulating component, and the pole post. A first conductive element is disposed on the side of the first insulating element away from the cover plate, and the first conductive element is connected to one end of the electrode post that extends out of the first insulating hole; The second conductive element is disposed on the side of the second insulating element away from the cover plate, and the second conductive element is connected to one end of the pole that extends out of the second insulating hole; Wherein, the dimensions of the second insulating component, the sealing ring, the first conductive component, and the second conductive component along the length direction of the cover plate are all greater than the dimensions along the width direction of the cover plate.

[0006] Furthermore, the outer contour of the sealing ring is monolithic or elliptical.

[0007] Furthermore, the width dimension of the cover plate is W1, and the outer contour dimension of the sealing ring along the width direction of the cover plate is W4, (W1-W4) / 2≥2.5mm.

[0008] Furthermore, the second insulating element, the first conductive element, and the second conductive element are all rectangular.

[0009] Furthermore, a first groove is provided on the end face of the pole connection hole facing the opening of the first insulating component, and a second groove is provided on the end face of the pole connection hole facing the opening of the second insulating component; The first insulating hole has a first annular protrusion on the end face of the hole facing the cover plate, the first annular protrusion extends into the first groove, and the first insulating hole has a third groove on the end face of the hole away from the cover plate. The second insulating element is embedded in the second groove, and the second insulating hole is provided with a second annular protrusion on the end face of the hole facing the cover plate. The second annular protrusion extends into the pole connection hole, and the second insulating hole is provided with a fourth groove on the end face of the hole away from the cover plate. The first conductive element is embedded in the third groove. The first conductive element has a first conductive hole. The first conductive hole has a third annular protrusion facing the opening end face of the first insulating element. The third annular protrusion extends into the first insulating hole. The first conductive hole has a fifth groove away from the opening end face of the first insulating element. The second conductive element is embedded in the fourth groove. The second conductive element is provided with a second conductive hole. The second conductive hole is provided with a sixth groove on the end face of the hole opposite to the opening of the second insulating element. The end of the pole extending out of the first conductive hole has a first shoulder and a second shoulder. The first shoulder extends into the first conductive hole, and the second shoulder is embedded in the fifth groove. The end of the pole extending out of the second conductive hole is provided with a third shoulder, which is embedded in the sixth groove; The sealing ring is disposed in the first insulating hole, and the sealing ring abuts against the bottom of the first groove, the second annular protrusion, the third annular protrusion and the first shoulder.

[0010] Furthermore, the wall of the second insulating hole is provided with an exhaust groove that connects the two end faces of its opening.

[0011] Furthermore, the electrode and the first conductive element are laser welded together.

[0012] This utility model also provides a battery cell, including a housing, an electrode assembly, and the aforementioned cover assembly. The housing has an opening, and the cover assembly closes the opening of the housing to form a receiving space. The electrode assembly is disposed in the receiving space. The electrode assembly includes an electrode body and a tab. The tab extends from one end of the electrode body toward the cover assembly, and the tab is connected to the first conductive element.

[0013] Furthermore, the battery cell is a blade battery.

[0014] This utility model also provides an electrical device, including the aforementioned battery cell.

[0015] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: the cover plate assembly, battery cell and electrical equipment of this utility model, by making the dimensions of the second insulating component, sealing ring, first conductive component and second conductive component along the length direction of the cover plate larger than the dimensions along the width direction of the cover plate, so that the current flow area of ​​the battery terminal structure is not limited by the battery thickness direction. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is an exploded view of the cover plate assembly disclosed in this utility model; Figure 2 This is a cross-sectional view of the cover plate assembly disclosed in this utility model; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a top view of the battery cell disclosed in this utility model; Figure 5 for Figure 4 Schematic diagram of the BB section; Figure 6 for Figure 5 A magnified view of a section at point C.

[0018] Explanation of reference numerals in the instruction manual: 1. Cover plate assembly; 11. Cover plate; 111. Electrode post connection hole; 112. Liquid injection hole; 113. Explosion-proof hole; 114. First groove; 115. Second groove; 12. First insulating component; 121. First insulating hole; 122. Hollowed-out area; 123. First annular protrusion; 124. Third groove; 13. Second insulating component; 131. Second insulating hole; 132. Second annular protrusion; 133. Fourth groove; 134. Vent groove; 14. Electrode post; 141. First shoulder; 142. Second shoulder; 143. Third shoulder; 15. Sealing ring; 16. First conductive component; 161. First conductive hole; 162. Third annular protrusion; 163. Fifth groove; 17. Second conductive component; 171. Second conductive hole; 172. Sixth groove; 2. Housing; 3. Electrode assembly; 31. Electrode body; 32. Electrode tab. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0020] Example 1: See Figures 1 to 3 As shown, this utility model discloses an embodiment of the cover plate assembly.

[0021] Cover plate assembly 1 includes: The cover plate 11 is provided with a pole connection hole 111 that extends through its thickness direction; The first insulating member 12 is disposed on one side of the cover plate 11 in the thickness direction, and the first insulating member 12 is provided with a first insulating hole 121 that extends through the cover plate 11 in the thickness direction. The second insulating member 13 is provided on the other side of the thickness direction of the cover plate 11, and the second insulating member 13 is provided with a second insulating hole 131 that extends through the thickness direction of the cover plate 11. The pole post 14 passes through the first insulating hole 121 and the second insulating hole 131; The sealing ring 15 seals and connects the cover plate 11, the first insulating component 12, the second insulating component 13, and the pole post 14. The first conductive element 16 is disposed on the side of the first insulating element 12 away from the cover plate 11, and the first conductive element 16 is connected to one end of the pole post 14 that extends out of the first insulating hole 121. The second conductive element 17 is disposed on the side of the second insulating element 13 away from the cover plate 11, and the second conductive element 17 is connected to one end of the pole post 14 that extends out of the second insulating hole 131. The dimensions of the second insulating element 13, the sealing ring 15, the first conductive element 16, and the second conductive element 17 along the length of the cover plate 11 are all greater than the dimensions along the width of the cover plate 11.

[0022] In the above description, the cover plate assembly 1 is used to connect to the open end of a housing to form the battery casing. The cover plate 11 is a strip-shaped plate, and the terminal connection hole 111 is used for the terminal 14 to pass through. In addition to the terminal connection hole 111, the cover plate 11 is also provided with an injection hole 112 and an explosion-proof hole 113. The injection hole 112 and the explosion-proof hole 113, like the terminal connection hole 111, are both through the thickness direction of the cover plate 11. The injection hole 112 is used to inject electrolyte into the battery, and the explosion-proof hole 113 is used to automatically release pressure when the internal pressure of the battery is too high. The first insulating element 12 is similar in shape and size to the cover plate 11. The first insulating element 12 is made of high-temperature resistant insulating material. A first insulating hole 121 allows the electrode post 14 to pass through. In addition to the first insulating hole 121, the first insulating element 12 also has a perforated area 122. Fluid can exchange between the side of the first insulating element 12 facing the cover plate 11 and the side facing away from the cover plate 11 through the perforated area 122. The injection hole 112 and the explosion-proof hole 113 are both directly opposite the perforated area 122. The second insulating element 13 is also made of high-temperature resistant insulating material. The second insulating element 13 isolates the cover plate 11 and the electrode post 14. A second insulating hole 131 allows the electrode post 14 to pass through. The electrode post 14 is made of conductive material and is a key conductive component in the battery that connects the internal circuitry to the external system. It typically has a columnar structure and is vertically mounted on the cover plate 11. The sealing ring 15 is made of elastic insulating material and is used to seal the gap between the electrode post 14 and the electrode post connection hole 111, ensuring that there is no air leakage between the electrode post 14 and the electrode post connection hole 111. The first conductive element 16 is made of conductive material and is plate-shaped, and is insulated from the cover plate 11. The second conductive element 17 is made of conductive material and is plate-shaped, and is insulated from the cover plate 11.

[0023] Specifically, the length, width, and thickness directions of the first insulating component 12, the second insulating component 13, the sealing ring 15, the first conductive component 16, and the second conductive component 17 are all consistent with the cover plate 11. The length of the cover plate 11 is L1, and the width is W1, where W1 < L1. The length of the first insulating component 12 is L2, and the width is W2, where W2 < W1 < L2. The length of the second insulating component 13 is L3, and the width is W3, where W3 < W1 < L3. The length of the sealing ring 15 is L4, and the width is W4, where W4 < W1 < L4. The length of the first conductive component 16 is L5, and the width is W5, where W5 < W1 < L5. The length of the second conductive component 17 is L6, and the width is W6, where W6 < W1 < L6. The area of ​​the first conductive element 16 and the second conductive element 17 determines the current-carrying area of ​​the battery terminal structure. When it is difficult to increase the size of the first conductive element 16 and the second conductive element 17 in the battery thickness direction, the area of ​​the first conductive element 16 and the second conductive element 17 is increased by increasing their size in the battery length direction, thus making the current-carrying area of ​​the battery terminal structure not limited by the battery thickness. The shape and size of the second insulating element 13 are adapted to fit the second conductive element 17. The shape and size of the sealing ring 15 are adapted to fit the first conductive element 16, ensuring a seal while preventing seal failure due to external welding and extrusion during production.

[0024] By using the above technical solution, the dimensions of the second insulating component, sealing ring, first conductive component, and second conductive component along the length direction of the cover plate are all set to be larger than the dimensions along the width direction of the cover plate, so that the current-passing area of ​​the battery terminal structure is not limited by the battery thickness.

[0025] In this embodiment, the outer contour of the sealing ring 15 is a monolithic circle.

[0026] In the above text, the shape and size of the inner hole of the sealing ring 15 are adapted to the shape and size of the pole post 14, and the outer contour of the monolith is consistent with the outer contour of the runway. The outer contour of the monolith includes two straight edges and two curved edges. The two straight edges are parallel and opposite, the two curved edges are opposite and their concave sides are opposite, and the two straight edges and two curved edges are alternately connected.

[0027] Specifically, when there are abrupt changes in shape at the edges of the sealing ring, on the one hand, the edges are natural stress concentration points, and the medium pressure cannot be evenly transmitted to the entire sealing surface, resulting in insufficient sealing force at the edges and corners, which can easily form leakage channels; on the other hand, when the edges and corners are in contact with the sealing surface, gaps can easily appear due to assembly errors and component deformation; in addition, the edges and corners are prone to wear and aging, and long-term use will lead to cracking due to stress concentration. When the outer contour of the sealing ring 15 is a monolithic shape, it not only meets the aspect ratio requirements of the sealing ring 15, but also has a smooth transition in the outer contour of the sealing ring 15, without pressure dead corners, resulting in more reliable sealing, more uniform stress and wear, and a longer service life.

[0028] By using the above technical solution, the outer contour of the sealing ring is set to a unicircle, which not only meets the length-to-width ratio requirement of the sealing ring, but also ensures a smooth transition of the outer contour of the sealing ring, eliminating pressure dead angles, making the seal more reliable, and ensuring uniform stress and wear, resulting in a longer service life.

[0029] In this embodiment, the width of the cover plate 11 is W1, the outer contour of the sealing ring 15 along the width direction of the cover plate 11 is W4, and (W1-W4) / 2≥2.5mm.

[0030] In the above text, the cover plate 11 has two sides in the width direction, and the sealing ring 15 has two sides in the width direction of the cover plate 11. The distance between adjacent sides of the cover plate 11 and the sealing ring 15 is not less than 2.5 mm, specifically 2.5 mm, 3 mm, 3.5 mm or 4 mm.

[0031] Specifically, the sealing ring 15 is generally embedded in the groove. Therefore, a groove needs to be set on the cover plate 11. A certain distance needs to be spaced between the groove wall and the side of the cover plate 11. This distance cannot be too small. If it is too small, the groove wall will be too thin and will not be able to limit the sealing ring 15. This distance also cannot be too large. If it is too large, the groove will be too small and the sealing ring 15 will be too small, and the sealing performance will not meet the requirements.

[0032] By using the above technical solution, the width relationship between the cover plate and the sealing ring is set within a certain range, so that the sealing ring can take into account both sealing performance and positioning reliability.

[0033] In this embodiment, the second insulating element 13, the first conductive element 16, and the second conductive element 17 are all rectangular.

[0034] In the above text, the second insulating component 13, the first conductive component 16 and the second conductive component 17 are rectangular with rounded corners, and their aspect ratio can be set to 1.5, 2 or 2.5.

[0035] Specifically, since the sealing performance of the second insulating element 13, the first conductive element 16, and the second conductive element 17 does not need to be considered, only the aspect ratio needs to be considered, the second insulating element 13, the first conductive element 16, and the second conductive element 17 are set as rectangles. Under the same aspect ratio, the area of ​​the rectangle can be maximized.

[0036] By using the above technical solution, the second insulating component, the first conductive component, and the second conductive component are set as rectangles, thereby maximizing the current-passing area of ​​the pole structure.

[0037] In this embodiment, the terminal connection hole 111 is provided with a first groove 114 on the end face of the hole facing the first insulating member 12, and the terminal connection hole 111 is provided with a second groove 115 on the end face of the hole facing the second insulating member 13. The first insulating hole 121 is provided with a first annular protrusion 123 on the end face of the hole facing the cover plate 11. The first annular protrusion 123 extends into the first groove 114. The first insulating hole 121 is provided with a third groove 124 on the end face of the hole away from the cover plate 11. The second insulating element 13 is embedded in the second groove 115. The second insulating hole 131 is provided with a second annular protrusion 132 on the end face of the hole facing the cover plate 11. The second annular protrusion 132 extends into the pole connection hole 111. The second insulating hole 131 is provided with a fourth groove 133 on the end face of the hole away from the cover plate 11. The first conductive element 16 is embedded in the third groove 124. The first conductive element 16 is provided with a first conductive hole 161. The first conductive hole 161 is provided with a third annular protrusion 162 facing the opening end face of the first insulating element 12. The third annular protrusion 162 extends into the first insulating hole 121. The first conductive hole 161 is provided with a fifth groove 163 away from the opening end face of the first insulating element 12. The second conductive element 17 is embedded in the fourth groove 133. The second conductive element 17 is provided with a second conductive hole 171. The second conductive hole 171 is provided with a sixth groove 172 away from the end face of the hole of the second insulating element 13. The end of the pole post 14 extending out of the first conductive hole 161 has a first shoulder 141 and a second shoulder 142. The first shoulder 141 extends into the first conductive hole 161, and the second shoulder 142 is embedded in the fifth groove 163. The end of the aforementioned pole post 14 that extends out of the aforementioned second conductive hole 171 is provided with a third shoulder 143, and the aforementioned third shoulder 143 is embedded in the aforementioned sixth groove 172; The sealing ring 15 is disposed in the first insulating hole 121, and the sealing ring 15 abuts against the bottom of the first groove 114, the second annular protrusion 132, the third annular protrusion 162 and the first shoulder 141.

[0038] In the above description, the terminal connection hole 111 connects to the bottom of the first groove 114 and the second groove 115. The first annular protrusion 123 of the first insulating member 12 abuts against the bottom of the first groove 114. The first annular protrusion 123 surrounds the opening of the first insulating hole 121, which connects to the bottom of the third groove 124. The second insulating member 13 abuts against the bottom of the second groove 115. The second annular protrusion 132 surrounds the opening of the second insulating hole 131, which connects to the bottom of the fourth groove 133. The first conductive member 16 abuts against the bottom of the third groove 124. The third annular protrusion 162 surrounds the opening of the first conductive hole 161, which connects to the bottom of the fifth groove 163. The second conductive member 17 abuts against the bottom of the fourth groove 133, and the second conductive hole 171 connects to the bottom of the sixth groove 172.

[0039] Specifically, the first insulating member 12 and the second insulating member 13 are embedded and connected to the cover plate 11, so that the first insulating member 12 and the second insulating member 13 are mutually positioned with the cover plate 11. The first conductive member 16 is embedded and connected to the first insulating member 12, so that the first conductive member 16 and the first insulating member 12 are mutually positioned. The second conductive member 17 is embedded and connected to the second insulating member 13, so that the second conductive member 17 and the second insulating member 13 are mutually positioned. The pole post 14 is provided with a first shoulder 141, so that the pole post 14 abuts against the sealing ring 15. The pole post 14 is provided with a second shoulder 142 and a third shoulder 143. The cover plate 11, the first insulating member 12, the second insulating member 13, the first conductive member 16 and the second conductive member 17 are clamped into a whole by the pole post 14.

[0040] Through the above technical solution, different parts of the cover plate assembly are interlocked, which improves the structural stability and sealing performance of the cover plate assembly.

[0041] In this embodiment, the wall of the second insulating hole 131 is provided with an exhaust groove 134 that connects the two end faces of its opening.

[0042] In the above text, the exhaust groove 134 is a groove provided on the wall of the second insulating hole 131. This groove is a through groove, that is, when the electrode post 14 is connected to the second insulating hole 131, a first channel is formed between the two. When the second conductive element 17 is connected to the fourth groove 133, a second channel is formed between the two. The first channel and the second channel are interconnected to form an exhaust channel. One end of the exhaust channel is connected to the outside of the battery, and the other end is connected to the electrode post connection hole 111.

[0043] Specifically, the second insulating component 13, in addition to serving as an insulating separator, also functions to some extent to seal the terminal post 14 and the terminal post connection hole 111. During the assembly of the cover assembly 1, the sealing ring 15 may be forgotten. During airtightness testing, the cover assembly may pass the airtightness test due to the sealing function of the second insulating component 13. However, in actual use, the sealing performance of the second insulating component 13 may be unreliable, leading to battery leakage after a period of time. Because of the aforementioned venting channel 134, on the one hand, if the sealing ring 15 is forgotten to be assembled, the venting channel 134 will leak. During airtightness testing, this leakage can be detected, allowing the sealing ring 15 to be promptly assembled onto the cover assembly 1, preventing battery leakage during subsequent use. On the other hand, in extreme cases, if the sealing ring 15 fails, the gas inside the battery can be discharged through the aforementioned venting channel, preventing battery combustion or explosion.

[0044] By using the above technical solution and setting up an exhaust groove, the reliability of the airtightness test of the cover plate assembly can be guaranteed, and exhaust can be achieved in extreme cases.

[0045] In this embodiment, the pole post 14 and the first conductive element 16 are laser welded together.

[0046] In the above text, the electrode post 14 and the first conductive element 16 are separate structures. After they are manufactured separately, they are assembled together. A high energy density laser beam is used as a heat source to achieve the connection between the electrode post 14 and the first conductive element 16.

[0047] Specifically, since the diameter of the electrode post 14 differs significantly from the length of the first conductive element 16, a large amount of material would be wasted if it were integrally formed. By using separate molding, the electrode post 14 can be manufactured from a base material with similar dimensions and shape, and the first conductive element 16 can also be manufactured from a base material with similar dimensions and shape, thus avoiding material waste.

[0048] The above technical solution enables the laser welding connection between the electrode post and the first conductive component, allowing for the fabrication of irregularly shaped electrode posts at a lower cost.

[0049] Example 2: See Figures 4 to 6 As shown, this utility model discloses an embodiment of a battery cell.

[0050] The battery cell includes a housing 2, an electrode assembly 3, and the aforementioned cover assembly 1. The housing 2 has an opening, and the cover assembly 1 closes the opening of the housing 2 to form an accommodating space. The electrode assembly 3 is disposed in the accommodating space. The electrode assembly 3 includes an electrode body 31 and a tab 32. The tab 32 extends from one end of the electrode body 31 toward the cover assembly 1 and is connected to the first conductive element 16.

[0051] In the above description, the housing 2 encloses a receiving space for accommodating the electrode assembly 3. The electrode assembly 3 enters and exits the receiving space of the housing 2 through its open opening. The electrode body 31 refers to the core unit for energy storage and release, which can be implemented using common positive and negative electrode materials found in lithium-ion batteries, aiming to ensure the basic functions of the battery. The tab 32 is used to connect the electrode body 31 and to conduct current. The edge of the cover plate 11 is sealed to the edge of the open opening of the housing 2, and the first insulating member 12 isolates the cover plate 11 from the electrode assembly 3. The first conductive member 16 is connected to the tab 32, and the second conductive member 17 is connected to the external circuit. Specifically, during charging, an external power source provides voltage, and lithium ions in the electrode body 31 are deintercalated from the positive electrode material, migrate through the electrolyte to the negative electrode, and are stored in the negative electrode material. At the same time, electrons flow to the negative electrode through the external circuit to balance the charge. During discharging, the lithium ions stored in the electrode body 31 are deintercalated from the negative electrode and return to the positive electrode through the electrolyte. Electrons then form a current through the external circuit to power the device.

[0052] With the above technical solution, since the dimensions of the second insulating component, sealing ring, first conductive component and second conductive component along the length direction of the cover plate are all larger than the dimensions along the width direction of the cover plate, the current flow area of ​​the electrode post is not limited by the thickness of the battery cell, and the current flow area of ​​the electrode post structure can be improved.

[0053] In this embodiment, the aforementioned battery cell is a blade battery.

[0054] In the above text, the battery cell is a blade battery. The length direction of the blade battery is consistent with the length direction of the cover plate 11, the thickness direction of the blade battery is consistent with the width direction of the cover plate 11, the height direction of the blade battery is consistent with the thickness direction of the cover plate 11, and the thickness of the battery cell is relatively narrow.

[0055] Specifically, the area of ​​the first conductive element 16 and the second conductive element 17 determines the current-carrying area of ​​the blade battery terminal structure. It is difficult to increase the size of the first conductive element 16 and the second conductive element 17 in the thickness direction of the blade battery. To increase the current-carrying area of ​​the blade battery terminal structure, the area of ​​the first conductive element 16 and the second conductive element 17 is increased in the length direction of the battery. This allows the current-carrying area of ​​the blade battery terminal structure to be unrestricted by its thickness, thus increasing the current-carrying area of ​​the terminal.

[0056] The following section describes the electrical equipment, including the battery cells mentioned above.

[0057] In the above text, electrical equipment can refer to automobiles, ships, airplanes, drones, spacecraft, electric toys, power tools, laptops, tablets, mobile phones, and other portable devices. Automobiles can be gasoline-powered, natural gas-powered, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the aforementioned electrical equipment.

[0058] The aforementioned battery cells can be applied to various electrical devices in the form of a single cell, multiple battery cells combined into a battery module, or multiple battery modules combined into a battery pack.

[0059] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate has a pole connection hole that extends through its thickness direction; A first insulating element is disposed on one side of the cover plate in the thickness direction, and the first insulating element has a first insulating hole that extends through the cover plate in the thickness direction. The second insulating element is disposed on the other side of the cover plate in the thickness direction, and the second insulating element has a second insulating hole that extends through the cover plate in the thickness direction. The pole passes through the first insulating hole and the second insulating hole; A sealing ring is used to seal and connect the cover plate, the first insulating component, the second insulating component, and the pole post. A first conductive element is disposed on the side of the first insulating element away from the cover plate, and the first conductive element is connected to one end of the electrode post that extends out of the first insulating hole; The second conductive element is disposed on the side of the second insulating element away from the cover plate, and the second conductive element is connected to one end of the pole that extends out of the second insulating hole; Wherein, the dimensions of the second insulating component, the sealing ring, the first conductive component, and the second conductive component along the length direction of the cover plate are all greater than the dimensions along the width direction of the cover plate.

2. The cover plate assembly according to claim 1, characterized in that, The outer contour of the sealing ring is either monolithic or elliptical.

3. The cover plate assembly according to claim 2, characterized in that, The width of the cover plate is W1, and the outer contour of the sealing ring along the width direction of the cover plate is W2, where (W1-W2) / 2≥2.5mm.

4. The cover plate assembly according to claim 1, characterized in that, The second insulating element, the first conductive element, and the second conductive element are all rectangular.

5. The cover plate assembly according to claim 1, characterized in that, The electrode connection hole has a first groove on the end face of the hole facing the first insulating component, and the electrode connection hole has a second groove on the end face of the hole facing the second insulating component. The first insulating hole has a first annular protrusion on the end face of the hole facing the cover plate, the first annular protrusion extends into the first groove, and the first insulating hole has a third groove on the end face of the hole away from the cover plate. The second insulating element is embedded in the second groove, and the second insulating hole is provided with a second annular protrusion on the end face of the hole facing the cover plate. The second annular protrusion extends into the pole connection hole, and the second insulating hole is provided with a fourth groove on the end face of the hole away from the cover plate. The first conductive element is embedded in the third groove. The first conductive element has a first conductive hole. The first conductive hole has a third annular protrusion facing the opening end face of the first insulating element. The third annular protrusion extends into the first insulating hole. The first conductive hole has a fifth groove away from the opening end face of the first insulating element. The second conductive element is embedded in the fourth groove. The second conductive element has a second conductive hole, and the second conductive hole has a sixth groove on the end face opposite to the opening of the second insulating element. The end of the pole extending out of the first conductive hole has a first shoulder and a second shoulder. The first shoulder extends into the first conductive hole, and the second shoulder is embedded in the fifth groove. The end of the pole extending out of the second conductive hole is provided with a third shoulder, which is embedded in the sixth groove; The sealing ring is disposed in the first insulating hole, and the sealing ring abuts against the bottom of the first groove, the second annular protrusion, the third annular protrusion and the first shoulder.

6. The cover plate assembly according to claim 1, characterized in that, The second insulating hole has an exhaust groove on its hole wall that connects the two end faces of the hole.

7. The cover plate assembly according to claim 1, characterized in that, The electrode and the first conductive element are laser welded together.

8. A single battery cell, characterized in that, The device includes a housing, an electrode assembly, and a cover plate assembly as described in any one of claims 1 to 7. The housing has an opening, and the cover plate assembly closes the opening of the housing to form a receiving space. The electrode assembly is disposed in the receiving space. The electrode assembly includes an electrode body and a tab. The tab extends from one end of the electrode body toward the cover plate assembly, and the tab is connected to the first conductive element.

9. The battery cell according to claim 8, characterized in that, The battery cell is a blade battery.

10. An electrical appliance, characterized in that, Includes the battery cell described in claim 8 or 9.

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