Battery cell and electronic equipment

Abstract

The utility model provides a battery cell and electronic equipment. The battery cell comprises a shell, a top cover plate, a battery cell body and an insulating coating piece, the insulating coating piece is coated outside the battery cell body and comprises a top surface coating sheet and a shell insulating part for isolating the battery cell body from the cavity wall of the accommodating cavity. And the shell insulating part and the top surface coating sheet of the insulating coating piece can complete full coating of the battery cell body, so that the risk of short circuit between the battery cell body and the shell is prevented. The top surface coating sheet is located between the top cover plate and the battery cell body to replace the lower plastic design of the battery cell, isolate the battery cell body from the top cover plate, avoid conductive connection between the battery cell body and the top cover plate, ensure the insulation performance of the battery cell, and improve the utilization rate of the internal space of the battery cell and the energy density of the battery cell.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery cell and electronic device. Background Technology

[0002] With the development of new energy vehicles, blade-type batteries with high space utilization have emerged in pursuit of higher energy density. Some existing blade-type batteries use a same-side arrangement for the cells, meaning that the positive and negative electrodes of the cell are located on the same side, in order to simplify battery pack design and reduce internal resistance.

[0003] Before the battery cell is installed into the casing, it needs to be covered with a soft and flexible insulating film to prevent damage from the casing and to prevent short circuits between the cell and the casing. Currently, the common method for covering the battery cell is to cover the bottom and sides of the bare cell, while the top surface of the cell, i.e., the side facing the output tab, is isolated from the metal top cover by a lower plastic component to prevent short circuits between the bare cell and the casing. However, due to the limitations of the lower plastic structure, the space utilization rate of the cell in the output tab direction is relatively low, and the energy density of the cell needs further improvement. Utility Model Content

[0004] In view of the problems existing in the prior art, the present invention provides a battery casing, a secondary battery and a battery pack to improve the technical problem that the space utilization rate of the existing battery cell in the direction of the tab is relatively low and the energy density of the battery cell needs to be further improved.

[0005] To solve the above-mentioned technical problems, the first aspect of this utility model provides a battery cell, the battery cell including a housing, a top cover plate, a battery cell body, and an insulating cover. The housing includes a receiving cavity, the top surface of which includes an opening. The top cover plate seals over the opening, the top cover plate including a cover plate body and a first terminal and a second terminal insulatedly mounted on the cover plate body. The battery cell body is installed in the receiving cavity, the battery cell body including a first tab and a second tab disposed facing the opening. The insulating cover covers the outside of the battery cell body, the insulating cover including a housing insulating portion for isolating the battery cell body from the cavity wall. The insulating cover further includes a top cover sheet, the top cover sheet being disposed between the cover plate body and the battery cell body, and integrally connected to the housing insulating portion. The top cover sheet includes a first through hole and a second through hole, the first tab passing through the first through hole and electrically connected to the first terminal, and the second tab passing through the second through hole and electrically connected to the second terminal.

[0006] In one embodiment of the battery cell of this utility model, the top covering sheet further includes a first top covering sheet and a second top covering sheet stacked along the opening direction, and the projections of the first top covering sheet and the second top covering sheet on the top cover plate at least partially overlap. The first top covering sheet has a first slot on its side away from the housing insulation portion, and the second top covering sheet has a second slot on its side away from the housing insulation portion. The first slot and the second slot together form the first through hole and the second through hole.

[0007] In one embodiment of the battery cell of this utility model, the top cover plate further includes an injection hole, the first top cover plate has a plurality of third through holes, the second top cover plate has a plurality of fourth through holes, the projection of the third through hole on the top cover plate coincides with the projection of the injection hole, the projection of the fourth through hole on the top cover plate coincides with the projection of the injection hole, and the projections of the third through hole and the fourth through hole on the top cover plate at least partially coincide.

[0008] In one embodiment of the battery cell of this utility model, the housing insulation portion includes a front cover sheet, a bottom cover sheet, and a back cover sheet that are integrally connected in sequence. The first top cover sheet is connected to the front cover sheet, and the second top cover sheet is connected to the back cover sheet. The insulation covering can be unfolded into a planar structure.

[0009] In one embodiment of the battery cell of this utility model, the housing insulation portion further includes at least one set of side-covering sheet assemblies. The side-covering sheet assembly includes a first side-covering sheet and a second side-covering sheet. The first side-covering sheet is integrally connected to the front-covering sheet, and the second side-covering sheet is integrally connected to the back-covering sheet. The first side-covering sheet and the second side-covering sheet at least partially overlap.

[0010] In one embodiment of the battery cell of this utility model, the side covering sheet assembly further includes a third side covering sheet integrally connected to the bottom covering sheet, the third side covering sheet at least partially overlapping the first side covering sheet, and / or, the third side covering sheet at least partially overlapping the second side covering sheet.

[0011] In one embodiment of the battery cell of this utility model, the battery cell further includes a fixing member, which adhesively connects the housing insulation portion and the top covering sheet.

[0012] In one embodiment of the battery cell of this utility model, the top cover plate further includes an explosion-proof valve, and a thinning portion is provided on the top cover plate, wherein the projection of the explosion-proof valve on the top cover plate covers the projection of the thinning portion.

[0013] In one embodiment of the battery cell of this utility model, the number of the thinning portions is multiple, and each thinning portion is strip-shaped or ring-shaped.

[0014] A second aspect of this utility model also provides an electronic device, which includes the battery cell described in any of the above claims.

[0015] This invention provides a battery cell and an electronic device. In this battery cell structure, the insulating portion of the housing and the top covering plate of the insulating cover can completely cover the battery cell body, preventing the risk of short circuit between the battery cell body and the housing. The top covering plate is located between the top cover plate and the battery cell body, replacing the lower plastic design of the battery cell and isolating the battery cell body from the top cover plate, avoiding conductive connection between the battery cell body and the top cover plate, and ensuring the insulation performance of the battery cell. At the same time, the top covering plate replacing the lower plastic design frees up redundant space between the battery cell tab side and the top cover plate, further improving the internal space utilization and energy density of the battery cell while ensuring the mechanical vibration performance of the battery cell. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of one embodiment of the battery cell of this utility model;

[0018] Figure 2 This is a schematic diagram showing the insulation coating state in one embodiment of the battery cell of this utility model;

[0019] Figure 3 This is a schematic diagram of the unfolded state of the insulating covering in one embodiment of the battery cell of this utility model;

[0020] Figure 4 This is a schematic diagram of the battery cell body structure in one embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of an electronic device in one embodiment of the present invention.

[0022] Component designation explanation:

[0023] 10. Electronic equipment; 11. Working part; 12. Battery pack; 100. Housing; 200. Top cover plate; 210. Cover plate body; 220. First terminal; 230. Second terminal; 240. Injection hole; 250. Explosion-proof valve; 300. Cell body; 310. First electrode; 320. Second electrode; 330. Separator; 340. First tab; 350. Second tab; 400. Insulating cover; 410. Top cover plate; 411. First top cover plate ; 4111, First groove; 412, Second top cover plate; 4121, Second groove; 413, First through hole; 414, Second through hole; 415, Third through hole; 416, Fourth through hole; 417, Thinning part; 420, Bottom cover plate; 430, Front cover plate; 440, Back cover plate; 450, Side cover plate assembly; 451, First side cover plate; 452, Second side cover plate; 453, Third side cover plate; 500, Fixing member. Detailed Implementation

[0024] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0025] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0026] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0027] To address the technical challenges of relatively low space utilization and insufficient energy density in existing battery cells, this invention provides a battery cell and electronic device. This design, which replaces the lower plastic layer, frees up redundant space between the battery cell's tab side and the top cover, further improving internal space utilization and energy density while maintaining the cell's mechanical vibration performance.

[0028] Please see Figures 1 to 5 The first aspect of this utility model provides a battery cell, which includes a housing 100, a top cover plate 200, a battery cell body 300, and an insulating covering 400. The shape of the housing 100 is not particularly limited; for example, the housing 100 can be a square or rectangular housing. Specifically, in this embodiment, the housing 100 is a blade-shaped housing. Blade batteries are a commonly used battery type in the current new energy field, therefore, the blade-shaped housing 100 has good compatibility with many application scenarios. However, it should be noted that as battery application scenarios continue to expand, it is possible to set the housing 100 in other shapes. The housing 100 includes a receiving cavity for accommodating the battery cell body 300. The top surface of the receiving cavity includes an opening that connects the outside of the housing 100 to the receiving cavity. The top surface of the receiving cavity can be an end face along the length direction of the housing 100 or an end face along the width direction of the housing 100. Specifically, in this embodiment, the top surface of the receiving cavity is the end face on one side along the width direction of the housing 100, that is, the opening direction of the opening is the width direction of the housing 100.

[0029] The top cover 200 seals over the opening, sealing the top surface of the battery cell to ensure its internal sealing and safety. The top cover 200 includes a cover body 210 and a first terminal 220 and a second terminal 230 insulatedly mounted on the cover body 210. The cover body 210 is made of high-strength, corrosion-resistant materials, such as aluminum alloy or stainless steel, to ensure sufficient strength and rigidity to withstand external pressure and impact. The first terminal 220 and the second terminal 230 are mounted on the cover body 210 with insulating material to ensure electrical isolation and prevent short circuits and leakage. The first terminal 220 and the second terminal 230 are used to electrically connect to the positive and negative electrode tabs of the battery cell body 300, respectively, to output the positive and negative terminals of the battery cell body 300.

[0030] The battery cell body 300 enters the housing 100 through an opening and is installed in the receiving cavity of the housing 100. The battery cell body 300 is mainly formed by winding or stacking a first electrode 310 and a second electrode 320, and a separator 330 is usually provided between the first electrode 310 and the second electrode 320. The polarities of the first electrode 310 and the second electrode 320 are opposite. In some embodiments, the first electrode 310 is a positive electrode and the second electrode 320 is a negative electrode. In other embodiments, the first electrode 310 is a negative electrode and the second electrode 320 is a positive electrode. The separator 330 is disposed between the first electrode 310 and the second electrode 320 to isolate the first electrode 310 and the second electrode 320. The base material of the separator 330 can be polypropylene (PP) or polyethylene (PE), etc. Specifically, in this embodiment, the battery cell body 300 adopts a stacked structure.

[0031] Please see Figure 4 The battery cell body 300 also includes a first tab 340 and a second tab 350 facing the opening. In other words, the first tab 340 and the second tab 350 are located on one side of the battery cell body 300 along the width direction of the housing 100. The first tab 340 and the second tab 350 have opposite polarities. The first tab 340 is electrically connected to the first electrode 310 of the battery cell body 300, and the second tab 350 is electrically connected to the second electrode 320 of the battery cell body 300. When the first electrode 310 is the positive electrode and the second electrode 320 is the negative electrode, the first tab 340 is the positive tab and the second tab 350 is the negative tab. Conversely, when the first electrode 310 is the negative electrode and the second electrode 320 is the positive electrode, the first tab 340 is the negative tab and the second tab 350 is the positive tab.

[0032] Please see Figure 2The insulating cover 400 covers the outside of the battery cell body 300, providing protection and insulation. The insulating cover 400 includes a housing insulation portion for isolating the battery cell body 300 from the cavity wall. The housing insulation portion covers the bottom surface and four sides of the battery cell body 300, preventing conductive connection between the battery cell body 300 and the housing 100. The insulating cover 400 also includes a top cover sheet 410, which is disposed between the cover plate body 210 and the battery cell body 300 and integrally connected to the housing insulation portion. The insulating cover 400 can be made of PP, PE, polyethylene terephthalate (PET), polyvinyl chloride (PVC), or other polymer materials. Specifically, in this embodiment, the insulating cover 400 uses Mylar film; in other words, the housing insulation portion and the top cover sheet 410 are integrally made of Mylar film.

[0033] Please see Figure 2 The top cover plate 410 includes a first through hole 413 and a second through hole 414. A first tab 340 passes through the first through hole 413 and is electrically connected to a first terminal 220. A second tab 350 passes through the second through hole 414 and is electrically connected to a second terminal 230. It should be noted that the first tab 340 can be directly electrically connected to the first terminal 220, or it can be indirectly connected to the first terminal 220 via a current collector. Similarly, the second tab 350 can be directly electrically connected to the second terminal 230, or it can be indirectly connected to the second terminal 230 via a current collector.

[0034] In this cell structure, the insulating portion of the casing of the insulating cover 400 and the top cover plate 410 can completely cover the cell body 300, preventing the risk of short circuit between the cell body 300 and the casing 100. The top cover plate 410 is located between the top cover plate 200 and the cell body 300, replacing the lower plastic design of the cell and isolating the cell body 300 from the top cover plate 200, avoiding conductive connection between the cell body 300 and the top cover plate 200, and ensuring the insulation performance of the cell. At the same time, the top cover plate 410 replacing the lower plastic design frees up redundant space between the cell tab side and the top cover plate 200, further improving the internal space utilization and energy density of the cell while ensuring the mechanical vibration performance of the cell.

[0035] Please see Figure 3In one embodiment of the battery cell of this utility model, the top covering sheet 410 further includes a first top covering sheet 411 and a second top covering sheet 412 stacked along the opening direction, and the projections of the first top covering sheet 411 and the second top covering sheet 412 on the top cover plate 200 at least partially overlap. Specifically, one side of the first top covering sheet 411 is integrally connected to the housing insulation part along the length direction of the housing 100, and one side of the second top covering sheet 412 is integrally connected to the housing insulation part along the length direction of the housing 100. The first top covering sheet 411 and the second top covering sheet 412 are folded towards each other to form at least partially overlapping surfaces, thereby ensuring the insulating covering effect of the top covering sheet 410 on the battery cell body 300 and the top cover plate 200. At the same time, the partial overlap of the first top covering sheet 411 and the second top covering sheet 412 facilitates the connection and fixation of the first top covering sheet 411 and the second top covering sheet 412.

[0036] Please see Figure 3 A first slot 4111 is formed on the side of the first top covering plate 411 facing away from the insulating part of the shell, and a second slot 4121 is formed on the side of the second top covering plate 412 facing away from the insulating part of the shell. The shape of the first slot 4111 and the second slot 4121 is not limited; they can be rectangular, arc-shaped, or semi-elliptical, but are not limited thereto. The positions of the first slot 4111 and the second slot 4121 correspond to each other, and the first slot 4111 and the second slot 4121 surround each other to form the first through hole 413 and the second through hole 414. The semi-open structure design of the first slot 4111 and the second slot 4121 can better adapt to the shape and position of the tab, making it easier for the insulating covering part 400 to... Figure 3 The shown open planar state, when the insulating sheath 400 is folded as follows: Figure 1 , Figure 2 As shown, the first slot 4111 and the second slot 4121 can avoid the first tab 340 and the second tab 350, allowing the tabs to pass smoothly through the first through hole 413 and the second through hole 414 and extend beyond the top cover plate 410, simplifying the assembly process. Simultaneously, the surrounding structure of the first slot 4111 and the second slot 4121 can adjust the size of the first through hole 413 and the second through hole 414 according to the shape of the tabs, reducing the gap around the tabs and minimizing the risk of short circuits.

[0037] Please see Figure 1In one embodiment of the battery cell of this utility model, the top cover plate 200 further includes an injection hole 240, which is used to inject electrolyte into the battery cell during the battery cell assembly process. A plurality of third through holes 415 are formed on the first top cover plate 411, and a plurality of fourth through holes 416 are formed on the second top cover plate 412. The design of the third through holes 415 and fourth through holes 416 ensures that the electrolyte flows smoothly into the insulating part of the casing to fill the battery cell body 300. The projections of the plurality of third through holes 415 on the top cover plate 200 coincide with the projections of the injection holes 240, and the projections of the plurality of fourth through holes 416 on the top cover plate 200 coincide with the projections of the injection holes 240. The projections of the third through holes 415 and fourth through holes 416 on the top cover plate 200 at least partially overlap. Since the first top covering sheet 411 and the second top covering sheet 412 are stacked, the openings of a single third through hole 415 and a fourth through hole 416 at least partially overlap to ensure that the electrolyte is smoothly injected into the insulating cover 400. Specifically, in this embodiment, the overlapping area of ​​the third through hole 415 and the fourth through hole 416 can be any overlap ratio of 30%, 50%, or 70%, but is not limited thereto. This ensures that the electrolyte is smoothly injected through the third through hole 415 and the fourth through hole 416, while avoiding excessively large through hole areas that could affect the insulation covering effect of the top covering sheet 410 between the cell body 300 and the top cover plate 200, thus avoiding the risk of short circuits.

[0038] Please see Figure 3 In one embodiment of the battery cell of this utility model, the housing insulation portion includes a front covering sheet 430, a bottom covering sheet 420, and a back covering sheet 440 integrally connected in sequence. The front covering sheet 430 and the back covering sheet 440 respectively cover the front, back, and sides of the battery cell body 300, and the bottom covering sheet 420 covers the bottom surface of the battery cell body 300, thereby isolating the battery cell body 300 from the cavity wall in all directions and avoiding the risk of short circuit between the battery cell body 300 and the housing 100. A first top covering sheet 411 is integrally connected to the front covering sheet 430, and a second top covering sheet 412 is integrally connected to the front covering sheet 430. The insulation covering 400 can be unfolded into a planar structure and formed into a three-dimensional covering structure by folding, which simplifies the production process of the insulation covering 400, reduces production costs, and also improves production efficiency.

[0039] Please see Figure 3In one embodiment of the battery cell of this utility model, the housing insulation portion further includes at least one set of side covering sheet assemblies 450. Specifically, in this embodiment, there are two sets of side covering sheet assemblies 450, which respectively cover both sides of the battery cell body 300 to isolate the battery cell body 300 from the cavity wall. The side covering sheet assembly 450 includes a first side covering sheet 451 and a second side covering sheet 452. The first side covering sheet 451 is integrally connected to the front covering sheet 430, and the second side covering sheet 452 is integrally connected to the back covering sheet 440, so that the insulating covering 400 unfolds into a planar structure. The first side cover 451 and the second side cover 452 overlap at least partially, so that the first side cover 451 and the second side cover 452 can cover the sides of the battery cell body 300 during the folding process. At the same time, it is convenient to glue, thermoplastic or thermopress the first side cover 451 and the second side cover 452, and ensure the insulation effect between the battery cell body 300 and the housing 100.

[0040] Please see Figure 3 In one embodiment of the battery cell of this utility model, the side covering assembly 450 further includes a third side covering 453 integrally connected to the bottom covering 420. The third side covering 453 at least partially overlaps with the first side covering 451, and / or, the third side covering 453 at least partially overlaps with the second side covering 452. Specifically, since the insulating covering 400 can be unfolded into a planar structure, in order to avoid the risk that the gap generated at the bottom of the bottom covering 420 and the side covering assembly 450 after folding will cause the battery cell body 300 to directly contact the housing 100, the first side covering 451 and the second side covering 452 of the stacked structure cooperate with the third side covering 453 to seal the gap, thereby reducing the risk of short circuit caused by direct contact between the housing 100 and the battery cell body 300. The stacking method of the first side cover 451, the second side cover 452, and the third side cover 453 after folding is not limited. In this embodiment, the first side cover 451 and the third side cover 453 together cover the side of the battery cell body 300, and the second side cover 452 is stacked on top of the first side cover 451 and the third side cover 453 and is fixed by adhesive or thermoplastic bonding.

[0041] Please see Figure 2In one embodiment of the battery cell of this utility model, the battery cell further includes a fixing member 500, which covers the housing insulation portion, the first top covering plate 411, and the second top covering plate 412. Specifically, in this embodiment, since the insulation covering plate 400 unfolds into a planar structure, after folding and covering the battery cell body 300, the fixing member 500 uses adhesive tape. The tape adheres and fixes the housing insulation portion, the first top covering plate 411, and the second top covering plate 412. The flexibility of the tape can adapt to the shape of the folded insulation covering plate 400, ensuring the uniformity and reliability of the fixing effect between the top covering plate 410 and the housing insulation portion. It should be noted that the fixing member 500 can also be used to cover the periphery of the housing insulation portion. Specifically, one end of the fastener 500 can be disposed on the front cover plate 430 of the housing insulation portion, and the other end can be disposed on the back cover plate 440 of the housing insulation portion, covering the first top cover plate 411 and the second top cover plate 412, thereby bonding and fixing the housing insulation portion, the first top cover plate 411 and the second top cover plate 412 together. Furthermore, multiple fasteners 500 can be provided, spaced apart along the length direction of the battery cell to further improve the fixing strength.

[0042] Please see Figure 3 In one embodiment of the battery cell of this utility model, the top cover plate 200 further includes an explosion-proof valve 250, and a thinning portion 417 is provided on the top covering sheet 410. The projection of the explosion-proof valve 250 on the top cover plate 200 covers the projection of the thinning portion 417. The thinning portion 417 is the thinning treatment area of ​​the top covering sheet 410, and the position of the thinning portion 417 corresponds to the position of the explosion-proof valve 250 on the top cover plate 200. Specifically, the Mylar film thickness of the thinning portion 417 is less than the Mylar film thickness of other areas of the top covering sheet 410. The design of the thinning portion 417 makes the top covering sheet 410 have lower strength at the position corresponding to the explosion-proof valve 250. When the internal gas pressure in the battery is too high or thermal runaway occurs, the thinning portion 417 can be opened in time, allowing the gas to reach the explosion-proof valve 250 more smoothly and be directionally depressurized through the explosion-proof valve 250.

[0043] Please see Figure 3 In one embodiment of the battery cell of this utility model, the thinning portion 417 can also be an open structure, including multiple vent holes arranged in strips or rings at intervals. Since the top covering sheet 410 is made of Mylar film material, a perforated structure or vent structure can be formed in the area of ​​the top covering sheet 410 corresponding to the explosion-proof valve 250 by a toothed knife or a perforation structure. When the internal pressure of the battery cell is abnormal, the gas can reach the explosion-proof valve 250 more smoothly and be depressurized in a directional manner through the explosion-proof valve 250.

[0044] Please see Figure 5The second aspect of this utility model also provides an electronic device. The electronic device 10 includes a working unit 11 and a battery pack 12. The working unit 11 is electrically connected to the battery pack 12 to obtain power support. The working unit 11 is a unit component capable of obtaining power from the battery pack 12 and performing corresponding operations, such as a fan blade rotation unit or a vacuum cleaner suction unit. The battery pack 12 provides power support for the operation of the working unit 11. The battery pack 12 includes a housing and at least one battery cell as described in any of the above embodiments disposed within the housing. That is, one or more battery cells can be disposed within the housing. If multiple battery cells are disposed within the housing, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells are connected in both series and parallel connections. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells is housed within the housing. Alternatively, multiple battery cells can first be connected in series, parallel, or a combination thereof to form a battery module, and then the multiple battery modules can be connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing. The casing protects the internal battery cells. It should be noted that the battery pack 12 may include not only the battery cells but also the battery pack thermal management system, circuit boards, etc., which will not be discussed in detail here.

[0045] Please see Figure 5 In one embodiment, the electronic device 10 is a vehicle, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, but is not limited thereto. The working part 11 of the vehicle is the body, and the battery pack 12 can be located at the bottom, front, or rear of the body and provides power support for the vehicle's movement or the operation of the electrical components inside the vehicle.

[0046] In other embodiments, electronic device 10 may also be a mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship 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 above-described electronic devices.

[0047] In the battery cell of this invention, the insulating portion of the casing and the top covering plate of the insulating cover can completely cover the battery cell body, preventing the risk of short circuit between the battery cell body and the casing. The top covering plate replaces the lower plastic design of the battery cell and is located between the top cover plate and the battery cell body to isolate the battery cell body from the top cover plate, avoiding conductive connection between the battery cell body and the top cover plate, and ensuring the insulation performance of the battery cell. At the same time, the design of the top covering plate replacing the lower plastic releases redundant space between the battery cell tab side and the top cover plate, further improving the internal space utilization and energy density of the battery cell while ensuring the mechanical vibration performance of the battery cell. This addresses the technical problem of relatively low space utilization and insufficient energy density of existing battery cells in the tab direction. Therefore, this invention effectively overcomes some practical problems in the prior art and has high utilization value and significance.

[0048] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery cell, characterized in that, include: A housing, the housing including a receiving cavity, the top surface of the receiving cavity including an opening; A top cover plate, which is sealed to the opening, and includes a cover plate body and a first terminal and a second terminal insulatedly mounted on the cover plate body; A battery cell body is installed in the receiving cavity, and the battery cell body includes a first electrode tab and a second electrode tab disposed facing the opening; An insulating covering is provided to cover the outside of the battery cell body, including a housing insulation portion for isolating the battery cell body from the cavity wall; The insulating covering also includes a top covering sheet, which is disposed between the cover plate body and the cell body and is integrally connected to the housing insulation part; The top cover includes a first through hole and a second through hole. The first electrode tab passes through the first through hole and is electrically connected to the first terminal, and the second electrode tab passes through the second through hole and is electrically connected to the second terminal.

2. The battery cell according to claim 1, characterized in that, The top covering sheet further includes a first top covering sheet and a second top covering sheet stacked along the opening direction, and the projections of the first top covering sheet and the second top covering sheet on the top cover plate at least partially overlap; the first top covering sheet has a first slot on the side away from the housing insulation portion, and the second top covering sheet has a second slot on the side away from the housing insulation portion, and the first slot and the second slot surround to form the first through hole and the second through hole.

3. The battery cell according to claim 2, characterized in that, The top cover plate also includes an injection hole. The first top cover plate has a plurality of third through holes, and the second top cover plate has a plurality of fourth through holes. The projection of the third through hole on the top cover plate coincides with the projection of the injection hole, and the projection of the fourth through hole on the top cover plate coincides with the projection of the injection hole. Furthermore, the projections of the third through hole and the fourth through hole on the top cover plate at least partially coincide.

4. The battery cell according to claim 2, characterized in that, The insulating portion of the housing includes a front cover sheet, a bottom cover sheet, and a back cover sheet that are integrally connected in sequence. The first top cover sheet is connected to the front cover sheet, and the second top cover sheet is connected to the back cover sheet. The insulating cover can be unfolded into a planar structure.

5. The battery cell according to claim 4, characterized in that, The housing insulation portion further includes at least one set of side covering sheet assemblies, the side covering sheet assembly including a first side covering sheet and a second side covering sheet, the first side covering sheet being integrally connected to the front covering sheet, and the second side covering sheet being integrally connected to the back covering sheet; the first side covering sheet and the second side covering sheet at least partially overlap.

6. The battery cell according to claim 5, characterized in that, The side cover assembly further includes a third side cover integrally connected to the bottom cover, the third side cover at least partially overlapping the first side cover, and / or the third side cover at least partially overlapping the second side cover.

7. The battery cell according to claim 2, characterized in that, The battery cell also includes a fixing member that covers the housing insulation portion, the first top cover sheet, and the second top cover sheet.

8. The battery cell according to claim 1, characterized in that, The top cover plate also includes an explosion-proof valve, and a thinning portion is provided on the top cover plate. The projection of the explosion-proof valve on the top cover plate covers the projection of the thinning portion.

9. The battery cell according to claim 1, characterized in that, The top cover plate also includes an explosion-proof valve, and the top cover plate is provided with a plurality of fifth through holes; the projection of the explosion-proof valve on the top cover plate covers the projection of the plurality of fifth through holes, and the plurality of fifth through holes are arranged in a strip or annular interval.

10. An electronic device, characterized in that, The electronic device includes the battery cell according to any one of claims 1 to 9.

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