Cover plate assembly, battery cell and electronic device

Abstract

The utility model provides a cover plate assembly comprising a cover plate body which comprises a liquid injection boss formed by protruding on a first side facing an electrode assembly, a liquid injection hole penetrating through the liquid injection boss, and a groove surrounding the liquid injection hole and recessed away from the electrode assembly; the first lower plastic and the second lower plastic are arranged on the first side of the cover plate body; the first pole and the second pole penetrate through the cover plate body and penetrate through the first lower plastic cement and the second lower plastic cement respectively, the first lower plastic cement is provided with a protrusion protruding towards the cover plate body, and the protrusion is inserted into the groove to prevent the first lower plastic cement from rotating. The utility model aims to provide the cover plate assembly, the battery cell and the electronic device, so as to at least prevent the first lower plastic from rotating.

Description

Technical Field

[0001] This utility model relates to a cover plate assembly, a battery cell, 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 and an electronic device to at least prevent the first plastic from rotating.

[0004] To achieve the above objectives, this utility model provides a cover plate assembly, comprising: a cover plate body, including a liquid injection boss protruding from a first side facing the electrode assembly, a liquid injection hole penetrating the liquid injection boss, and a groove recessed around the liquid injection hole and away from the electrode assembly; a first lower plastic and a second lower plastic, disposed on the first side of the cover plate body; 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, wherein the first lower plastic has a protrusion protruding toward the cover plate body, and the protrusion is inserted into the groove to prevent the first lower plastic from rotating.

[0005] In some embodiments, the groove is an annular groove surrounding the injection boss.

[0006] In some embodiments, the depth of the groove ranges from 0.3 mm to 1.2 mm.

[0007] In some embodiments, the protrusions are a plurality of tabs spaced apart around the injection boss.

[0008] In some embodiments, the groove is a plurality of notches formed in the injection boss and arranged around the injection hole.

[0009] In some embodiments, the depth of the groove ranges from 0.1 mm to 0.3 mm.

[0010] In some embodiments, the protrusions correspond one-to-one with the notches, and the protrusions are inserted into the notches.

[0011] In some embodiments, the first lower plastic has a through hole communicating with the injection hole, and a protrusion surrounds the through hole.

[0012] 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 tab of the electrode assembly is electrically connected to a first terminal, and a second tab of the electrode assembly is electrically connected to a second terminal.

[0013] Embodiments of this application also provide an electronic device including the aforementioned battery cell.

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

[0015] The cover body of an embodiment of this application includes a liquid injection boss protruding from a first side facing the electrode assembly, a liquid injection hole penetrating the liquid injection boss, and a recess surrounding the liquid injection hole and recessed away from the electrode assembly. A first lower plastic has a protrusion protruding toward the cover body, the protrusion inserting into the recess to prevent rotation of the first lower plastic. 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] Figures 4 to 7 Exploded views of the cover plate assembly according to the first embodiment of this application are shown from different perspectives.

[0021] Figure 8 A perspective view of the cover plate body according to the first embodiment of this application is shown, as well as an enlarged view of region B in the perspective view.

[0022] Figure 9 A perspective view of the first lower plastic according to the first embodiment of this application is shown, as well as an enlarged view of region C in the perspective view.

[0023] Figure 10 A top view of the cover plate assembly according to the first 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.

[0024] Figures 11 to 14 Exploded views of the cover plate assembly according to the second embodiment of this application are shown from different perspectives.

[0025] Figure 15 A perspective view of the cover plate body according to the second embodiment of this application is shown, as well as an enlarged view of region G in the perspective view.

[0026] Figure 16 A perspective view of the first lower plastic according to the second embodiment of this application is shown, as well as an enlarged view of region H in the perspective view.

[0027] Figure 17 A top view of the cover plate assembly according to the second embodiment of this application, a cross-sectional view taken along line II of the top view, and an enlarged view of region J in the cross-sectional view are shown.

[0028] Figure 18 An exploded view of a battery cell according to a third embodiment of this application is shown.

[0029] Figure 19 A front view of a battery cell according to a third embodiment of this application is shown, as well as a cross-sectional view taken along line AA of the front view.

[0030] Figure 20 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 21 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.

[0032] Figure 22 The illustration shows a top view of the cover plate assembly facing the electrode assembly according to the sixth 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. Detailed Implementation

[0033] To better understand the spirit of the embodiments of this application, the following description is based on some preferred embodiments of this application.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Figure 3 A perspective view of a battery cell 100 according to a first embodiment of this application is shown. Figures 4 to 7 Exploded views of the cover plate assembly according to the first embodiment of this application are shown from different perspectives. Figure 8 A perspective view of the cover plate body 10 according to the first embodiment of this application is shown, as well as an enlarged view of region B in the perspective view. Figure 9 A perspective view of the first lower plastic 21 according to the first embodiment of this application is shown, as well as an enlarged view of region C in the perspective view. Figure 10 A top view of the cover plate assembly according to the first 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. Figures 11 to 14 Exploded views of the cover plate assembly according to the second embodiment of this application are shown from different perspectives. Figure 15 A perspective view of the cover plate body 10 according to the second embodiment of this application is shown, as well as an enlarged view of region G in the perspective view. Figure 16 A perspective view of the first lower plastic 21 according to the second embodiment of this application is shown, as well as an enlarged view of region H in the perspective view. Figure 17A top view of the cover plate assembly according to the second embodiment of this application, a cross-sectional view taken along line II of the top view, and an enlarged view of region J in the cross-sectional view are shown.

[0041] 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 an electrode assembly 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 assembly. 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 nickel can be plated onto the surface of the housing.

[0042] 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 assembly; 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.

[0043] 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 electrode tab 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 electrode tab connecting portion 612 is located on one side of the electrode assembly, and the first electrode post connecting portion 610 is connected to the first electrode tab connecting portion 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 electrode tab connecting portion 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 electrode tab connecting portion 622 is located on the other side of the electrode assembly, and the second electrode post connecting portion 620 is connected to the second electrode tab connecting portion 622.

[0044] The cover 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 toward the cover body 10, the protrusion 212 being inserted into the recess 16 to prevent the first lower plastic 21 from rotating.

[0045] In the first and second embodiments, the first lower plastic 21 has a through hole 211 communicating with the injection hole 14, and a protrusion 212 surrounds the through hole 211. The through hole 211 is used for the passage of electrolyte during injection. The first lower plastic 21 is fixed not only at the position of the first electrode post 31, but also at the position of the injection hole 14, so as to achieve anti-rotation of the two axes of the first lower plastic 21 and prevent the first lower plastic from tilting or twisting.

[0046] In the first embodiment, the groove 16 is an annular groove surrounding the injection boss 12. When forming the injection hole 14, to ensure the protrusion height of the injection boss 12, a groove is typically formed around the injection boss 12, with a depth of, for example, 0.1 mm to 0.3 mm, with a median of 0.2 mm. In the first embodiment of this application, this groove is further deepened to ensure the mating depth between the groove 16 and the protrusion 212, thus ensuring the anti-rotation effect on the first lower plastic 21. The resulting groove 16 has a depth range of 0.3 mm to 1.2 mm. The protrusion 212 consists of multiple protrusions spaced apart around the injection boss 12, extending into the annular groove 16. The spaced arrangement of the protrusions facilitates the flow of electrolyte between the protrusions.

[0047] In the second embodiment, the groove 16 consists of multiple notches formed in the injection boss 12 and arranged around the injection hole 14. When forming the injection hole 14, a groove is typically formed around the injection boss 12, with a depth of, for example, 0.1 mm to 0.3 mm, with a median of 0.2 mm. In this embodiment, a notch is formed from this groove towards the injection boss 12, with the depth of the notch being the same as the groove, i.e., the bottom surface of the notch is flush with the groove. Since the notch is formed on the injection boss 12 protruding relative to the cover plate body 10, the mating depth between the notch and the protrusion 212 can be guaranteed, thus ensuring the anti-rotation effect on the first lower plastic 21. The protrusion 212 corresponds one-to-one with the notch, and the protrusion 212 is inserted into the notch, with the two tightly fitted and positioned. The one-to-one mating of the protrusion 212 and the notch secures the protrusion 212, preventing the first lower plastic 21 from rotating around the injection hole 14, thereby increasing the anti-rotation effect on the first lower plastic 21.

[0048] Figure 18 An exploded view of a battery cell 100 according to a third embodiment of this application is shown. Figure 19 A front view of a battery cell 100 according to a third 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 or second embodiment, the third 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 20 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. Although the shape-fitting structure at the injection hole 14 is not shown, it can be understood that the fourth embodiment includes the contents of the first or second embodiment.

[0051] 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.

[0052] Figure 21 A top view of the cover plate assembly according to the 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 the shape-fitting structure at the injection hole 14 is not shown, it can be understood that the fifth embodiment includes the contents of the first or second embodiment.

[0053] 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.

[0054] Figure 22 The illustration shows a top view of the cover plate assembly facing the electrode assembly according to the sixth 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. Although the shape-fitting structure at the injection hole 14 is not shown, it can be understood that the sixth embodiment includes the contents of the first or second embodiment.

[0055] Based on the first or second embodiment, in the sixth embodiment, the first adapter piece 61 engages with the first lower plastic piece 21 in a pin-hole manner at a position offset from the first pole post 31 to further 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.

[0056] 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 and the second lower plastic 22 by means of a pin hole fit, so as to further prevent the second lower plastic 22 from rotating around the second pole post 32.

[0057] 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.

[0058] 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 cover plate body includes a liquid injection boss protruding from a first side facing the electrode assembly, a liquid injection hole penetrating the liquid injection boss, and a groove recessed around the liquid injection hole and away from the electrode assembly. The first and second lower plastics are disposed on the first side of the cover plate body; The first and second poles pass through the cover plate body, and respectively pass through the first lower plastic and the second lower plastic. The first lower plastic has a protrusion that protrudes toward the cover plate body, and the protrusion is inserted into the groove to prevent the first lower plastic from rotating.

2. The cover plate assembly according to claim 1, characterized in that, The groove is an annular groove surrounding the injection boss.

3. The cover plate assembly according to claim 2, characterized in that, The depth of the groove ranges from 0.3 mm to 1.2 mm.

4. The cover plate assembly according to claim 2, characterized in that, The protrusions are multiple protrusions arranged at intervals around the injection boss.

5. The cover plate assembly according to claim 1, characterized in that, The groove is a plurality of notches formed in the injection boss and arranged around the injection hole.

6. The cover plate assembly according to claim 5, characterized in that, The depth of the groove ranges from 0.1 mm to 0.3 mm.

7. The cover plate assembly according to claim 5, characterized in that, The protrusions correspond one-to-one with the notches, and the protrusions are inserted into the notches.

8. The cover plate assembly according to claim 1, characterized in that, The first lower plastic has a through hole communicating with the injection hole, and the protrusion surrounds the through hole.

9. A battery cell, characterized in that, include: case; The cover assembly as described in any one of claims 1-8, 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 a first electrode post, and a second tab of the electrode assembly is electrically connected to a second electrode post.

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

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