Cover plate assembly, battery cell, battery pack and electronic device

Abstract

The utility model provides a cover plate assembly, which comprises a first lower plastic cement and a second lower plastic cement which are arranged on a first side, facing an electrode assembly, of a cover plate body, and one side, facing the electrode assembly, of the first lower plastic cement is provided with a first combination part; the first pole column and the second pole column penetrate through the cover plate body and penetrate through the first lower plastic cement and the second lower plastic cement respectively; the first switching piece and the second switching piece are electrically connected with the first pole and the second pole respectively, and the first switching piece is matched with the first lower plastic in a pin hole matching mode at the position deviating from the first pole so as to prevent the first lower plastic from rotating. The utility model aims to provide a cover plate assembly, a battery cell, a battery pack and an electronic device, so as to at least prevent a first lower plastic from rotating.

Description

Technical Field

[0001] This utility model relates to a cover plate assembly, a battery cell, a battery pack, and an electronic device. Background Technology

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Commonly used batteries include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and rechargeable alkaline zinc-manganese batteries. Among these, lithium-ion batteries have become the mainstream power battery for new energy vehicles due to their advantages such as high specific energy, high specific power, long lifespan, and low cost. Utility Model Content

[0003] In view of the problems existing in the related technologies, the purpose of this utility model is to provide a cover plate assembly, a battery cell, a battery pack and an electronic device to at least prevent the first plastic rotation.

[0004] To achieve the above objectives, this utility model provides a cover plate assembly, comprising: a first lower plastic and a second lower plastic, disposed on a first side of the cover plate body facing the electrode assembly, the first lower plastic having a first joint portion on the side facing the electrode assembly; a first electrode post and a second electrode post passing through the cover plate body, respectively passing through the first lower plastic and the second lower plastic; a first adapter piece and a second adapter piece, respectively electrically connected to the first electrode post and the second electrode post, the first adapter piece engaging with the first lower plastic in a pin-hole manner at a position offset from the first electrode post, to prevent the first lower plastic from rotating.

[0005] In some embodiments, one of the first lower plastic and the first adapter piece is provided with a pin, the pin including at least one edge, and the other of the first lower plastic and the first adapter piece is provided with a hole having a shape that mates with the pin, the pin being inserted into the hole to form a pin-hole fit.

[0006] In some embodiments, the projection of the pin onto the cover body is polygonal or elliptical.

[0007] In some embodiments, the first lower plastic and the first adapter piece have through holes, and the cover plate assembly further includes pins passing through the through holes to secure the first lower plastic and the first adapter piece.

[0008] In some embodiments, the second adapter piece is positioned at a location offset from the second pole post and engages with the second lower plastic piece in a pin-hole manner to prevent the second lower plastic piece from rotating around the second pole post.

[0009] In some embodiments, the first adapter has an electrode post connection portion located between the electrode assembly and the first lower plastic and electrically connected to the first electrode post, and a pin located on one side of the electrode assembly along the direction from the second electrode post to the first electrode post and connected to the electrode tab of the electrode assembly. The electrode post connection portion is connected to the pin, and the first lower plastic has a groove for receiving the electrode post connection portion, with the pin protruding from the bottom of the groove toward the electrode assembly.

[0010] In some embodiments, a hole is disposed between the first pole and the pin along the radial direction of the first pole.

[0011] Embodiments of this application also provide a battery cell, comprising: a housing; a cover assembly of any of the above, the cover assembly covering the housing and defining a receiving cavity with the housing; an electrode assembly, housed within the receiving cavity, wherein a first electrode tab of the electrode assembly is electrically connected to a first adapter plate, and a second electrode tab of the electrode assembly is electrically connected to a second adapter plate.

[0012] Embodiments of this application also provide a battery pack including the aforementioned battery cells.

[0013] Embodiments of this application also provide an electronic device including the battery pack described above.

[0014] The beneficial technical effects of this utility model are as follows:

[0015] In an embodiment of this application, the first adapter piece engages with the first lower plastic piece at a position offset from the first pole post in a pin-hole manner to prevent the first lower plastic piece from rotating. Attached Figure Description

[0016] 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.

[0017] Figure 1 A cover plate assembly of the prior art is shown.

[0018] Figure 2 An electronic device according to an embodiment of this application is shown.

[0019] Figure 3 A perspective view of a battery cell according to a first embodiment of this application is shown.

[0020] Figure 4 A perspective view of a cover plate assembly according to a first embodiment of this application is shown.

[0021] Figure 5 An exploded view of a cover plate assembly according to a first embodiment of this application is shown.

[0022] Figure 6 The cover plate assembly according to the first embodiment of this application is shown. Figure 4 A three-dimensional view of the opposite side.

[0023] Figure 7 The illustration shows a top view of the cover plate assembly facing the electrode assembly according to the first embodiment of this application, a cross-sectional view taken along the YY line of the top view, and an enlarged view of the Z region in the cross-sectional view.

[0024] Figure 8 A front view of a cover plate assembly according to a first embodiment of this application is shown.

[0025] Figure 9 A perspective view of the second lower plastic facing the electrode assembly side according to the first embodiment of this application is shown.

[0026] Figure 10 A perspective view of a first adapter piece according to a first embodiment of this application is shown.

[0027] Figure 11 An exploded view of a battery cell 100 according to a second embodiment of this application is shown.

[0028] Figure 12 A front view of a battery cell 100 according to a second embodiment of this application is shown, as well as a cross-sectional view taken along line AA of the front view.

[0029] Figure 13 A top view of a cover plate assembly according to a third embodiment of this application, a cross-sectional view taken along line DD of the top view, a cross-sectional view taken along line EE of the top view, and an enlarged view of region F in the cross-sectional view are shown.

[0030] Figure 14 A top view of the cover plate assembly according to the fourth embodiment of this application, a cross-sectional view taken along line KK of the top view, and an enlarged view of region L in the cross-sectional view are shown.

[0031] Figure 15 A top view of a cover plate assembly according to a fifth embodiment of this application, a cross-sectional view taken along the UU line in the top view, and an enlarged view of the V region in the cross-sectional view are shown. Detailed Implementation

[0032] To better understand the spirit of the embodiments of this application, the following description is based on some preferred embodiments of this application.

[0033] Embodiments of this application will be described in detail below. Throughout this specification, identical or similar components and components having identical or similar functions are indicated by similar reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative and diagrammatic in nature and are intended to provide a basic understanding of this application. The embodiments of this application should not be construed as limiting this application.

[0034] As used herein, the terms “approximately,” “generally,” “substantially,” and “about” are used to describe and indicate minor variations. When used in conjunction with an event or situation, these terms may refer to examples in which the event or situation occurred precisely or in examples in which the event or situation occurred very approximately.

[0035] In this specification, unless otherwise specified or limited, relative terms such as “central,” “longitudinal,” “lateral,” “front,” “rear,” “right,” “left,” “inner,” “outer,” “lower,” “higher,” “horizontal,” “vertical,” “above,” “below,” “above,” “below,” “top,” “bottom,” and their derivatives (e.g., “horizontally,” “downward,” “upward,” etc.) should be interpreted as referring to the directions described in the discussion or depicted in the accompanying drawings. These relative terms are used for descriptive convenience only and do not require that this application be constructed or operated in a particular orientation.

[0036] For ease of description, "first," "second," "third," etc., can be used in this article to distinguish different components of a figure or a series of figures. "First," "second," "third," etc., are not intended to describe the corresponding components.

[0037] Figure 1 The diagram illustrates a prior art cover assembly where the lower plastic of a typical battery cell is divided into two halves: a separate lower plastic 1 and a separate lower plastic 2, each fixed to a terminal post 3. However, the longer separate lower plastic 1 can twist, for example, rotating around the terminal post 3, causing interference when the cover assembly is placed over the housing. Furthermore, the position of the Mylar membrane encasing the electrode assembly, which is heat-fused to the lower plastic, is not fixed. The twisted position of the lower plastic can also affect the sealing performance around the terminal post 3, making it crucial to fix the position of the lower plastic.

[0038] This utility model provides an electronic device 1000. For ease of explanation, the following embodiments use a vehicle as an example to illustrate the electronic device 1000. See also... Figure 2The vehicle has a battery pack 1002 installed inside, which can be located at the bottom, front, or rear of the vehicle body 1001. The battery pack 1002 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The working part of the electronic device 1000 is electrically connected to the battery pack 1002 to obtain electrical power. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, but are not limited thereto. The working part is the vehicle body, and the battery pack 1002 is located at the bottom of the vehicle body, providing electrical power for the vehicle's movement or the operation of its internal electrical components. However, in some other embodiments, the electronic device 1000 can also be a mobile phone, portable device, laptop, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; the working part can obtain electrical energy from the battery pack 1002 and perform corresponding functions, such as a fan blade rotation unit or a vacuum cleaner's suction unit. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc.; 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, etc. This application does not impose any special limitations on the aforementioned electronic device 1000.

[0039] Figure 3 A perspective view of a battery cell 100 according to a first embodiment of this application is shown. Figure 4 A perspective view of a cover plate assembly according to a first embodiment of this application is shown. Figure 5 An exploded view of a cover plate assembly according to a first embodiment of this application is shown. Figure 6 The cover plate assembly according to the first embodiment of this application is shown. Figure 4 A three-dimensional view of the opposite side. Figure 7 The illustration shows a top view of the cover plate assembly facing the electrode assembly according to the first embodiment of this application, a cross-sectional view taken along the YY line of the top view, and an enlarged view of the Z region in the cross-sectional view. Figure 8 A front view of a cover plate assembly according to a first embodiment of this application is shown. Figure 9 A perspective view of the second lower plastic component facing the electrode assembly according to the first embodiment of this application is shown. Figure 10 A perspective view of the first adapter piece 61 according to the first embodiment of this application is shown.

[0040] The battery cell 100 is, for example, a prismatic battery. The battery cell 100 includes: a housing 102; a cover assembly that covers the housing 102 and defines a receiving cavity within the housing 102; and electrode assemblies 51 and 52 housed within the receiving cavity. The housing 102 includes a bottom wall and side walls surrounding the bottom wall. The receiving cavity houses the electrode assembly 120, electrolyte, and other necessary battery components. Specifically, the size of the housing can be determined based on the specific size and number of the electrode assemblies 51 and 52. The housing can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. To prevent the battery casing from rusting during long-term use, a rust-resistant material such as metallic nickel can be plated onto the surface of the housing.

[0041] The cover plate assembly includes a cover plate body (plain aluminum sheet) 10; a first lower plastic 21 and a second lower plastic 22 disposed on the first side of the cover plate body 10 facing the electrode assemblies 51 and 52; a first electrode post 31 passing through the cover plate body 10 and the first lower plastic 21; and a second electrode post 32 passing through the cover plate body 10 and the second lower plastic 22. A first electrode tab (e.g., a positive electrode tab) of the electrode assembly is electrically connected to the first electrode post 31, and a second electrode tab (e.g., a negative electrode tab) of the electrode assembly is electrically connected to the second electrode post 32. The length of the cover plate body 10 in the direction from the first electrode post 31 to the second electrode post 32 ranges from 100 mm to 350 mm, and the first lower plastic 21 is longer than the second lower plastic 22. When the length of the cover plate body 10 is longer, the number of lower plastics can be adjusted according to the length; for example, the cover plate assembly may also include a third lower plastic or more lower plastics. The thickness of the cover plate body 10 is, for example, approximately 2 mm. The cover plate body 10 is provided with an injection hole 14 and an explosion-proof valve 70. The injection hole 14 is located, for example, between the explosion-proof valve 70 and the first electrode post 31, and the explosion-proof valve 70 is located between the injection hole 14 and the second electrode post 32. Along the direction from the cover plate body 10 to the electrode assembly, the portion of the first lower plastic 21 that overlaps with the explosion-proof valve 70 has a plurality of vent holes 82 for venting through the first lower plastic 21.

[0042] The cover plate assembly also includes a first adapter piece 61 and a second adapter piece 62. The first adapter piece 61 has a first electrode post connecting portion 610 located between the electrode assembly and the first lower plastic 21 and electrically connected to the first electrode post 31, and a first pin (electrode post connecting portion) 612 connected to the positive electrode tab of the electrode assembly. Along the direction from the second electrode post 32 to the first electrode post 31, the first pin 612 is located on one side of the electrode assembly, and the first electrode post connecting portion 610 is connected to the first pin 612. The second adapter piece 62 has a second electrode post connecting portion 620 located between the electrode assembly and the second lower plastic 22 and electrically connected to the second electrode post 32, and a second pin 622 connected to the negative electrode tab of the electrode assembly. Along the direction from the second electrode post 32 to the first electrode post 31, the second pin 622 is located on the other side of the electrode assembly, and the second electrode post connecting portion 620 is connected to the second pin 622.

[0043] In the first embodiment, the first adapter piece 61 engages with the first lower plastic piece 21 at a position offset from the first pole post 31 using a pin-hole engagement to prevent the first lower plastic piece 21 from rotating. One of the first lower plastic piece 21 and the first adapter piece 61 is provided with a pin 218, and the other is provided with a hole 616. The pin 218 is inserted into the hole 616 to form a pin-hole engagement. Along the radial direction of the first pole post 31, the hole 616 is located between the first pole post 31 and the first pin 612. The first pole post connecting portion 610 of the first adapter piece 61 is welded to the first pole post 31, thus fixing the position of the first adapter piece 61. Furthermore, the pin-hole engagement between the first adapter piece 61 and the first lower plastic piece 21 fixes the position of the first lower plastic piece 21. Therefore, the first lower plastic piece 21 is fixed not only at the position of the first pole post 31 but also further fixed at a position offset from the first pole post 31, thereby achieving dual-axis anti-rotation of the first lower plastic piece 21.

[0044] The pin 218 shown in the attached figure is located on the first lower plastic 21. The pin 218 is cylindrical, but its shape is not limited to this. For example, the pin 218 may also include at least one edge, and the hole 616 has a shape that mates with the pin 218. Through the pin 218 having at least one edge and the hole 616 that mates with it, the pin 218 is engaged in the hole 616, enhancing the effect of preventing the first lower plastic 21 from rotating. The projection of the pin 218 onto the cover plate body 10 may also be square, polygonal, or elliptical.

[0045] Although not shown, the first lower plastic 21 and the first adapter piece 61 may have through holes, and the cover assembly also includes a pin that passes through the through holes to secure the first lower plastic 21 and the first adapter piece 61, i.e., the pin is not integral with the first lower plastic 21 or the first adapter piece 61.

[0046] The first lower plastic 21 also has a groove 219 for accommodating the electrode connection 610. The pin 218 protrudes from the bottom of the groove 219 toward the electrode assembly. At least a portion of the first adapter piece 61 (the electrode connection 610) is accommodated in the first lower plastic 21, which can save the space occupied by the first adapter piece 61. The groove 219 matches the shape of the electrode connection 610, which can further prevent the first lower plastic 21 from rotating.

[0047] The fit between the second adapter piece 62 and the second lower plastic is similar to the fit between the first lower plastic and the first adapter piece 61. The second adapter piece 62 is also positioned at a position offset from the second pole post 32 by engaging with the second lower plastic 22 in a pin-hole manner to prevent the second lower plastic 22 from rotating around the second pole post 32.

[0048] Figure 11 An exploded view of a battery cell 100 according to a second embodiment of this application is shown. Figure 12 A front view of a battery cell 100 according to a second embodiment of this application is shown, as well as a cross-sectional view taken along line AA of the front view.

[0049] Based on the first embodiment, the second embodiment further includes a bracket 40 clamped between the adjacent stacked first electrode assembly 51 and second electrode assembly 52 of the electrode assembly, and the bracket 40 has an extension end 42 extending from the first electrode assembly 51 and the second electrode assembly 52, the extension end 42 being inserted into the first lower plastic 21 and the second lower plastic 22 to prevent the first lower plastic 21 and the second lower plastic 22 from rotating.

[0050] Figure 13 A top view, a cross-sectional view taken along line DD of the top view, a cross-sectional view taken along line EE of the top view, and an enlarged view of region F in the cross-sectional view are shown. Although pin 218 and the shape-fitting structure at pin 218 are not shown, it can be understood that the third embodiment includes the contents of the first or second embodiment.

[0051] Based on the first embodiment, in the third embodiment, the cover plate body 10 includes a liquid injection boss 12 protruding from a first side facing the electrode assembly, a liquid injection hole 14 penetrating the liquid injection boss 12, and a recess 16 surrounding the liquid injection hole 14 and recessed away from the electrode assembly. The first lower plastic 21 has a protrusion 212 protruding towards the cover plate body 10, the protrusion 212 being inserted into the recess 16 to prevent the first lower plastic 21 from rotating. The first lower plastic 21 has a through hole 211 communicating with the liquid injection hole 14, the protrusion 212 surrounding the through hole 211, the through hole 211 being used for electrolyte passage during liquid injection. The third embodiment further fixes the first lower plastic 21 at the position of the liquid injection hole 14 to prevent the first lower plastic from tilting or twisting.

[0052] Figure 14 A top view of a cover plate assembly according to the fourth embodiment of this application, a cross-sectional view taken along line KK of the top view, and an enlarged view of region L in the cross-sectional view are shown. Although pin 218 and the shape-fitting structure at pin 218 are not shown, it can be understood that the fourth embodiment includes the contents of the first or second embodiment.

[0053] Based on the first or second embodiment, in the fourth embodiment, the first lower plastic 21 has a lower plastic protrusion 213 protruding towards the cover plate body 10 on the side facing the cover plate body 10. The explosion-proof valve 70 has an explosion-proof valve protrusion 72 protruding away from the cover plate body 10 on the first side. The lower plastic protrusion 213 and the explosion-proof valve protrusion 72 abut against each other to restrict the rotation of the first lower plastic 21. There may be a gap between the lower plastic protrusion 213 and the explosion-proof valve protrusion 72, or they may be tightly fitted. Both the lower plastic protrusion 213 and the explosion-proof valve protrusion 72 are circular protrusion structures. The lower plastic protrusion 213 is disposed around the explosion-proof valve protrusion 72. The explosion-proof valve protrusion 72 is provided with a circular explosion-proof valve groove 74 arranged along the extension path of the explosion-proof valve protrusion 72. The opening of the explosion-proof valve groove 74 is away from the first lower plastic 21. The explosion-proof valve 70 includes an overlapping portion 76 surrounding the explosion-proof valve protrusion 72. The overlapping portion 76 overlaps the first protrusion 213 on the side facing the cover plate body 10 and is laser welded to the cover plate body 10.

[0054] Figure 15 A top view of a cover plate assembly according to a fifth embodiment of this application, a cross-sectional view taken along the UU line of the top view, and an enlarged view of the V region in the cross-sectional view are shown. Although pin 218 and the shape-fitting structure at pin 218 are not shown, it can be understood that the fifth embodiment includes the contents of the first or second embodiment.

[0055] Based on the first or second embodiment, in the fifth embodiment, the side of the cover plate body 10 facing the electrode assembly has a recessed portion 18 that is opposite to the recesses of the lower plastics 21 and 22. One of the first lower plastics 21 and the second lower plastics 22 has a protrusion 220 that protrudes toward the cover plate body 10. The other of the first lower plastics 21 and the second lower plastics 22 has a lower plastic through hole 216. The protrusion 220 passes through the lower plastic through hole 216 and extends into the recessed portion 18, fixing the first lower plastics 21 and the second lower plastics 22 together, and simultaneously confining the first lower plastics 21 and the second lower plastics 22 within the cover plate body 10, further preventing the first lower plastics 21 and the second lower plastics 22 from rotating.

[0056] The embodiments of this application, by fixing the first lower plastic 21 and the second lower plastic 22, prevent the first lower plastic 21 and the second lower plastic 22 from twisting / rotating, and simultaneously bring the following advantages: improved sealing around the first electrode post 31 and the second electrode post 32, enhancing the overall safety and airtightness of the battery cell 100; facilitated heat fusion between the Mylar membrane 80 and the first lower plastic 21 and the second lower plastic 22 during the manufacturing process of the battery cell 100; and during the housing insertion process after assembling the cover plate assembly and the electrode assemblies 51 and 52, the first lower plastic 21 and the second lower plastic 22 are properly secured. Plastic 21 and the second lower plastic 22 do not rotate but are centered for easy guidance. The Mylar membrane 80 will not rotate with the first lower plastic 21 and the second lower plastic 22, reducing the friction between the Mylar membrane 80 and the casing 102 and improving the safety performance of the battery cell 100. The positions of the first lower plastic 21 and the second lower plastic 22 are stable, and during the supply chain, transportation and production process, no impurity particles will be generated due to shaking and friction. Impurity particles will bring the risk of corrosion to the battery cell 100. The embodiments of this application improve the safety performance of the battery.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cover plate assembly, characterized in that, include: The first and second plastic inserts are disposed on the first side of the cover plate body facing the electrode assembly; The first and second poles pass through the cover plate body and pass through the first lower plastic and the second lower plastic, respectively; The first adapter piece and the second adapter piece are electrically connected to the first terminal and the second terminal, respectively. The first adapter piece engages with the first lower plastic piece at a position offset from the first pole post using a pin-hole engagement method to prevent the first lower plastic piece from rotating.

2. The cover plate assembly according to claim 1, characterized in that, One of the first lower plastic piece and the first adapter piece is provided with a pin, the pin including at least one edge, and the other of the first lower plastic piece and the first adapter piece is provided with a hole, the hole having a shape that mates with the pin, the pin being inserted into the hole to form a pin-hole fit.

3. The cover plate assembly according to claim 1, characterized in that, The projection of the pin onto the cover plate body is polygonal or elliptical.

4. The cover plate assembly according to claim 1, characterized in that, The first lower plastic and the first adapter piece have through holes, and the cover plate assembly further includes pins passing through the through holes to secure the first lower plastic and the first adapter piece.

5. The cover plate assembly according to claim 1, characterized in that, The second adapter piece is positioned at a location offset from the second pole post and is positioned in a pin-hole manner with the second lower plastic piece to prevent the second lower plastic piece from rotating around the second pole post.

6. The cover plate assembly according to claim 2, characterized in that, The first adapter has an electrode post connecting portion located between the electrode assembly and the first lower plastic and electrically connected to the first electrode post, and a pin located on one side of the electrode assembly along the direction from the second electrode post to the first electrode post and connected to the electrode tab of the electrode assembly. The electrode post connecting portion is connected to the pin. The first lower plastic has a groove for accommodating the electrode connection portion, and the pin protrudes from the bottom of the groove toward the electrode assembly.

7. The cover plate assembly according to claim 6, characterized in that, Along the radial direction of the first pole post, the hole is disposed between the first pole post and the pin.

8. A battery cell, characterized in that, include: case; The cover assembly as described in any one of claims 1-7, the cover assembly covering the housing and defining a receiving cavity with the housing; An electrode assembly is housed within the receiving cavity, wherein a first tab of the electrode assembly is electrically connected to the first adapter plate, and a second tab of the electrode assembly is electrically connected to the second adapter plate.

9. A battery pack, characterized in that, Includes the battery cell as described in claim 8.

10. An electronic device, characterized in that, Includes the battery pack as described in claim 9.

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