Single battery, battery and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a single battery, a battery and an electric device. The battery cell comprises: a battery case having an opening; the cover plate assembly is buckled with the opening; the battery cell assembly is arranged in the battery shell; the battery cell assembly comprises at least one battery cell, the battery cell comprises a battery cell main body and two tab parts led out from the battery cell main body, and each tab part comprises a plurality of layers of stacked tabs; the insulating shaping plate is positioned between the cover plate assembly and the battery cell main body and is fixed relative to the position of the cover plate assembly; the tab part is wound around the side end surface of the insulating shaping plate from the battery cell main body and is electrically connected to the cover plate assembly, and at least part of tabs in the tab part are propped against the side end surface of the insulating shaping plate. According to the single battery, by optimizing the structure of the single battery, the form of the tab part between the cover plate assembly and the battery cell main body can be improved, and the possibility that the tab part is inversely inserted into the battery cell main body is reduced, so that the structural performance and the safety performance of the single battery cell are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a single cell, a battery and an electrical device. Background Art

[0002] At present, the common structure of square lithium batteries is generally to set the battery cell in the shell. The battery cell is designed as a multi-electrode structure. The multi-layered pole ear is first welded to the adapter by ultrasonic welding, and then the adapter is welded to the top cover by laser welding. After the laser welding process, the battery cell is assembled into a battery.

[0003] In order to further improve energy density and simplify the process, the commonly used structure is upgraded to weld the multi-layer tabs together through ultrasonic welding, and then weld the tabs and the top cover through laser welding. After laser welding, the battery cells are closed into the shell and assembled into a battery.

[0004] It is worth noting that the multi-layer pole ears in the common structure and the common structure upgraded battery structure need to be melted together by ultrasonic welding. In the process of processing and manufacturing, how to gather the multi-layer foil into a fixed structural form becomes a difficulty. Because the battery cell has a certain thickness, in order to ensure that all pole ears can be welded on the cover assembly, the redundancy of the pole ears cannot be completely avoided, and the redundant pole ears may be inserted into the battery cell body after the battery cell is put into the shell, causing a short circuit. Specifically, in the process of bending the pole ear part relative to the cover assembly, the multi-layer pole ears in the pole ear part will appear in a variety of pole ear forms under the influence of the closing force, and the most common ones are "S" type or "scattered and disordered" forms. The "S" type or "scattered and disordered" pole ears will be inserted into the interior of the battery cell body. At this time, if the negative pole ear in the battery cell body contacts the positive electrode sheet, it will cause a short circuit, or the positive pole ear contacts the negative electrode sheet, which will cause a short circuit.

[0005] Therefore, there is an urgent need to provide a single cell that can improve structural performance and safety performance. Utility Model Content

[0006] The utility model provides a single cell, a battery and an electric device. The single cell can improve the shape of the pole ear between the cover plate assembly and the battery body by optimizing its own structure, reduce the possibility of the pole ear being inserted into the battery body, and improve the structural performance and safety performance of the single cell.

[0007] In order to achieve the above object, the utility model provides the following technical solutions:

[0008] According to a first aspect of the utility model, a single cell is provided, comprising:

[0009] a battery housing having an opening;

[0010] A cover plate assembly, the cover plate assembly being buckled to the opening;

[0011] A battery cell assembly, the battery cell assembly is placed inside the battery housing; the battery cell assembly includes at least one battery cell, the battery cell includes a battery cell body and two pole ear parts extending from the battery cell body, the pole ear parts include multiple layers of stacked pole ears;

[0012] An insulating shaping plate, wherein the insulating shaping plate is located between the cover plate assembly and the battery cell body and is fixed relative to the cover plate assembly; the pole ear portion is electrically connected to the cover plate assembly from the battery cell body through the side end surface of the insulating shaping plate, and at least part of the pole ear in the pole ear portion is in contact with the side end surface of the insulating shaping plate.

[0013] According to a second aspect of the present invention, a battery is provided, comprising a single cell provided by any technical solution in the first aspect.

[0014] According to a third aspect of the present invention, there is provided an electrical device, comprising a battery as provided by any technical solution in the second aspect.

[0015] The single cell provided in the present application solves the problem of short circuit caused by reverse insertion of the pole ear through an insulating shaping plate. Specifically, after connecting the cover plate assembly and the pole ear portion, the pole ear portion needs to be bent relative to the cover plate assembly so that the combined form of the battery cell assembly and the cover plate assembly fits the battery housing, so that the battery cell assembly can be effectively assembled inside the battery housing.

[0016] It is worth noting that in this embodiment, the pole ear part is led out from the battery body, and the part of the pole ear part away from the battery body is used to connect with the cover plate assembly. After the pole ear part is connected with the cover plate assembly, the insulating shaping plate can be fixed relative to the cover plate assembly; when the pole ear part is bent, the insulating shaping plate can limit the pole ear part, so that the pole ear part passes through the side end surface of the insulating shaping plate to form a C-shaped structure.

[0017] It should be noted that the single battery provided by the present application can gather the pole ear into a fixed shape by using an insulating shaping plate, which can effectively reduce the redundancy of the pole ear. Moreover, the use of this solution can effectively reduce the risk of the pole ear being inserted into the battery body and causing a short circuit inside the battery. At the same time, this structural setting can also reduce the occurrence of short-circuit points formed by the pole ear inserted into the pole piece area inside the battery body during use, which can improve the structural performance and safety performance of the single battery and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0019] Figure 1 A schematic diagram of the structure of a single cell provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the middle part;

[0021] Figures 3 to 5 for Figure 2 Schematic diagram of structural changes during the preparation of the medium structure;

[0022] Figure 6 for Figure 1 An exploded schematic diagram of a single cell shown in FIG.

[0023] Figure 7 for Figure 1 Another exploded schematic diagram of a single cell shown in FIG.

[0024] Figure 8 for Figure 6 An enlarged schematic diagram of the middle insulation shaping plate;

[0025] Fig. 9 for Figure 8 Schematic diagram of the structure of the middle insulation shaping plate at another angle.

[0026] The following are the descriptions of the reference numerals:

[0027] 100, battery case; 200, cover plate assembly; 300, battery cell assembly; 310, battery cell; 311, battery cell body; 312, pole ear; 400, insulation shaping plate; 500, adhesive; 600, adapter. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0029] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0030] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0031] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0032] First, as Figure 1 and Figure 2 As shown, the embodiment of the present application provides a single battery, which includes: a battery housing 100 , a cover assembly 200 , a cell assembly 300 and an insulating shaping plate 400 . Figure 1 The exemplary box in FIG. 4 selects the battery cell assembly 300. It should be understood that although the insulating shaping plate 400 is located in the dotted box, it is not a part of the battery cell assembly 300. Please continue to refer to Figure 1 and Figure 2 The battery housing 100 has an opening; the cover assembly 200 is buckled into the opening; the battery cell assembly 300 is placed inside the battery housing 100; the battery cell assembly 300 includes at least one battery cell 310, and the battery cell 310 includes a battery cell body 311 and two pole ear portions 312 extending from the battery cell body 311, such as Figure 3As shown, the pole ear portion 312 includes multiple layers of stacked pole ears; the insulating shaping plate 400 is located between the cover plate assembly 200 and the battery cell body 311, and is fixed relative to the cover plate assembly 200; the pole ear portion 312 is electrically connected to the cover plate assembly 200 from the battery cell body 311 through the side end surface of the insulating shaping plate 400, and at least part of the pole ear in the pole ear portion 312 is in contact with the side end surface of the insulating shaping plate 400.

[0033] It is understandable that the insulating shaping plate 400 can be made of insulating material or have an insulating layer on its surface. Among the pole ears that abut against the insulating shaping plate 400, the pole ears closest to the side end surface of the insulating shaping plate 400 directly abut against the insulating shaping plate 400, and the other pole ears indirectly abut against the insulating shaping plate 400.

[0034] The single cell provided in the embodiment of the present application solves the problem of short circuit caused by inverted insertion of the tab by means of the insulating shaping plate 400. Figure 4 and Figure 5 As shown, after the cover plate assembly 200 and the pole ear portion 312 are connected, the pole ear portion 312 needs to be bent relative to the cover plate assembly 200 so that the combined form of the battery cell assembly 300 and the cover plate assembly 200 is adapted to the battery housing 100 (such as Figure 1 As shown), the battery cell assembly 300 can be effectively assembled inside the battery housing 100.

[0035] It is worth noting that in this embodiment, the pole ear portion 312 is led out from the battery body 311, and the portion of the pole ear portion 312 away from the battery body 311 is used to connect with the cover assembly 200. After the pole ear portion 312 is connected to the cover assembly 200, the insulating shaping plate 400 can be fixed relative to the cover assembly 200; when the pole ear portion 312 is bent, the insulating shaping plate 400 can limit the pole ear portion 312, so that the pole ear portion 312 passes through the side end surface of the insulating shaping plate 400 to form a C-shaped structure.

[0036] It should be noted that the single cell provided in the embodiment of the present application can gather the pole ear portion 312 into a fixed shape by using the insulating shaping plate 400, which can effectively reduce the redundancy of the pole ear portion 312. Moreover, the use of this solution can effectively reduce the risk of the pole ear portion 312 being inserted into the battery body 311, causing a short circuit inside the battery cell 310. At the same time, this structural setting can also reduce the occurrence of a short-circuit point formed by the pole ear inserted into the pole piece area inside the battery body 311 during use, which can improve the structural performance and safety performance of the single cell and extend the service life.

[0037] When forming a single battery, the pole ear portion 312 may be directly connected to the cap plate assembly 200 , or the pole ear portion 312 may be connected to the cap plate assembly 200 through an adapter 600 .

[0038] In one example, if Figure 6 As shown, the pole ear portion 312 can be welded to the adapter 600 by ultrasonic welding, and then the adapter 600 can be welded to the cover assembly 200 by laser welding; after laser welding, the battery cell 310 is bent relative to the cover assembly 200 and assembled into a single battery.

[0039] In order to further improve the energy density and simplify the process, in another example, Figure 7 As shown, the multi-layer pole ears can be welded together by ultrasonic welding process to form the pole ear part 312, and then the pole ear part 312 can be directly welded to the cover plate assembly 200 by laser welding; after laser welding, the battery cell 310 is bent relative to the cover plate assembly 200 and assembled into a single battery by shell.

[0040] It can be understood that the use of the insulating shaping plate 400 in the above two examples can gather the pole ear portion 312 into a fixed shape, which can effectively reduce the redundancy of the pole ear portion 312. Moreover, the use of this solution can effectively reduce the risk of the pole ear portion 312 being inserted into the battery body 311, causing a short circuit inside the battery cell 310. At the same time, this structural setting can also reduce the occurrence of short-circuit points formed by the pole ear inserted into the pole piece area inside the battery body 311 during use, which can improve the structural performance and safety performance of the single battery and extend the service life.

[0041] It is worth noting that when the pole ear portion 312 is directly connected to the cover plate assembly 200, the insulating shaping plate 400 can be connected by an adhesive 500 (such as Fig. 9 When the pole ear portion 312 is connected to the cover plate assembly 200 through the adapter 600, the insulating shaping plate 400 is insulated and fixed to the surface of the adapter 600 through the adhesive 500.

[0042] It can be understood that the bonding connection is simple and easy to operate, which can improve assembly efficiency.

[0043] In a specific embodiment, the adhesive member 500 is a double-sided adhesive, such as acrylic adhesive. The double-sided adhesive on the insulating shaping plate 400 is connected to the adapter 600 or the lower plastic in the cover assembly 200 .

[0044] The above-mentioned adhesive member 500 can be provided integrally with the insulating shaping plate 400 or separately as required, and the details are not repeated here.

[0045] In one embodiment, please continue to refer to Figure 2In the structure shown, along the thickness direction of the battery cell body 311, the pole ear portion 312 is led out of the battery cell body 311 from the middle of the battery cell body 311 to one side wall of the battery cell body 311; along the thickness direction of the battery cell body 311, the size of the side end surface of the insulating shaping plate 400 from the middle of the pole ear portion 312 led out of the battery cell body 311 is L, and the size from the middle of the battery cell body 311 to one side wall of the battery cell body 311 is D / 2, and the ratio of L to D / 2 is 90% to 100%.

[0046] It is worth noting that Figure 3 As shown, since the multi-layered tabs in the tab portion 312 are led out of the battery cell body 311 from the middle of the battery cell 310 to one side wall, during the process of folding the tab portion 312, along the thickness direction of the battery cell 310, the dimension L of the side end surface of the insulating shaping plate 400 from the middle of the tab portion 312 leading out of the battery cell body 311 will affect the folding effect of the tab portion 312. If the side end surface of the insulating shaping plate 400 is too far away from the middle of the battery cell body 311, the insulating shaping plate 400 will extend too long, the tab portion 312 will be over-supported by the insulating shaping plate 400 during the bending process, and the tab inside the tab portion 312 will be easily torn. If the side end surface of the insulating shaping plate 400 is too close to the middle of the battery cell body 311, the insulating shaping plate 400 will not be able to effectively limit the shape of the pole ear 312. The pole ear 312 will still bend excessively, forming an "S" shape or a chaotic shape, resulting in inverted insertion and causing an internal short circuit in the battery cell 310.

[0047] Therefore, in the embodiment of the present application, the ratio of L to D / 2 is set to 90% to 100%, which can optimize the state of the bent pole ear 312 in the single battery and avoid the phenomenon of the pole ear 312 being inserted into the battery body 311 invertedly, thereby improving the structural performance and safety performance of the single battery.

[0048] In addition, it is worth noting that the ratio of L to D / 2 is in the range of 90% to 100%, and the closer to 100%, the better. This can better optimize the state of the bent pole ear 312 in the single cell and avoid the phenomenon of the pole ear 312 being inserted upside down into the battery body 311, thereby improving the structural performance and safety performance of the single cell.

[0049] In one embodiment, please continue to refer to Figure 6 and Figure 7 In the structure shown, two pole ears 312 are located on the same side of the battery body 311 and are spaced apart. It should be understood that in this embodiment, the pole ears 312 are formed after cutting to optimize the spatial layout of the pole ears 312 of different polarities in the shell, so as to improve the space utilization rate in the shell and improve the energy density of the single battery.

[0050] Please continue to refer to Figure 6 and Figure 7 In the structure shown, each pole ear portion 312 is shaped by an insulating shaping plate 400 to further optimize the structural performance and safety performance of the single battery.

[0051] In a specific embodiment, one of the two pole ears 312 is a positive pole ear 312, and the other pole ear 312 is a negative pole ear 312. The root positions of the two pole ears 312 connected to the cover plate assembly 200 are fixed with an insulating shaping plate 400. Accordingly, the shapes of the two pole ears 312 after being folded can be limited by the insulating shaping plate 400, which can further improve the structural performance and safety performance of the single battery.

[0052] In one embodiment, in the single cell provided in the embodiment of the present application, the cover assembly 200 includes a cover body and a pole, the pole is arranged on the cover body, and the pole ear portion 312 in the battery cell 310 is connected to the pole, so as to connect the external structure with the battery cell 310 through the pole.

[0053] It is worth noting that the cover assembly 200 may also be provided with a lower plastic, an upper plastic or other sealing components, wherein the lower plastic is provided on the side of the cover body facing the battery cell 310, and the pole is exposed on the lower plastic surface to connect to the pole ear portion 312; the upper plastic is provided on the side of the cover body facing away from the battery cell 310, and the pole is exposed on the upper plastic surface. It should be understood that the width of the lower plastic is not necessarily consistent with that of the cover body.

[0054] In one embodiment, the insulating shaping plate 400 corresponding to the positive polarity pole ear portion 312 and the insulating shaping plate 400 corresponding to the negative polarity pole ear portion 312 are provided independently of each other.

[0055] Specifically, the two pole lugs 312 of the same battery cell 310 respectively use different insulating shaping plates 400 , and there is a gap between the two insulating shaping plates 400 .

[0056] It should be noted that when two insulating shaping plates 400 are set to respectively fix the positive polarity pole ear portion 312 and the negative polarity pole ear portion 312, the interval between the two insulating shaping plates 400 can be used to avoid certain structures inside the single cell, such as the injection hole and the explosion-proof valve, so as to ensure other structural setting requirements of the single cell.

[0057] At the same time, this arrangement can also reduce the difficulty of assembly, so that the position of each insulating shaping plate 400 can be adjusted according to needs.

[0058] Of course, the same insulating shaping plate 400 can also be used to shape the positive pole ear portion 312 and the negative pole ear portion 312 at the same time to reduce the number of structural parts in the single battery. It is worth noting that when the same insulating shaping plate 400 is used to shape the pole ear portion 312, the insulating shaping plate 400 may need to be provided with a slot or other structure to avoid the explosion-proof valve or the injection hole.

[0059] In one embodiment, the battery cell assembly 300 includes two battery cells 310 , and the two battery cells 310 are stacked along a thickness direction of the battery cells 310 .

[0060] It is worth noting that each battery cell 310 includes a positive polarity pole ear portion 312 and a negative polarity pole ear portion 312, and the pole ear portions 312 of the same polarity in the two battery cells 310 can be connected by the same adapter 600, and connected to the pole in the cap plate assembly 200 through the adapter 600. In other words, the pole connected to the positive polarity pole ear portion 312 has a positive polarity, and the pole connected to the negative polarity pole ear portion 312 has a negative polarity.

[0061] Alternatively, the same polarity lugs 312 of the two battery cells 310 may be directly connected to the same pole. In this case, the pole connected to the positive lug 312 has a positive polarity, and the pole connected to the negative lug 312 has a negative polarity.

[0062] like Figure 6 and Figure 7 As shown, in the two battery cell assemblies 300, the pole ears 312 of the same polarity share the same insulating shaping plate 400. It is worth noting that Figure 5 Middle structure bending formation Figure 2 In the middle structure, the bending directions of the inner ear parts 312 of the two battery cells 310 are opposite. Figure 2 As shown, taking the pole ear portions 312 of the same polarity in two battery cells 310 as an example, the two pole ear portions 312 are bent respectively relative to the two side end surfaces oppositely arranged in the insulating shaping plate 400, and the C-shaped structure formed by each pole ear portion 312 convexly faces away from the side of the C-shaped structure formed by the other pole ear portion 312.

[0063] In one embodiment, in two battery cells 310, two positive pole lugs 312 are shaped using one insulating positive plate, and two negative pole lugs 312 are shaped using another insulating shaping plate 400. It can be understood that along the arrangement direction of the two pole lugs 312 in the same battery cell 310, the pole lugs 312 of the same polarity in the two battery cells 310 are approximately located at the same position. When the same insulating shaping plate 400 is used to shape the pole lugs 312 of the same polarity, other structures between the pole lugs 312 of different polarities can be effectively avoided to improve the rationality of the layout of the internal structural components of the single battery.

[0064] When two cells 310 in the battery assembly are connected to the cap assembly 200, the positive pole ear 312 is welded to one pole of the cap assembly 200, and the negative pole ear 312 is welded to the other pole of the cap assembly 200. After the pole ear 312 of two or more cells 310 is connected to the cap assembly 200, an insulating shaping plate 400 is respectively attached above the connection between the pole ear 312 and the pole, and then the cells 310 can be assembled.

[0065] It is worth noting that high-temperature resistant tape is usually required to be affixed to the weld marks above the joints of commonly used structures to prevent possible welding slag from falling and injuring the battery cell 310. The insulating shaping plate 400 in this embodiment can also replace the high-temperature resistant tape of commonly used structures without increasing the process time and cost.

[0066] In one embodiment, the single cell provided in the embodiment of the present application further includes an insulating film, which is wrapped around the outer surface of the battery cell assembly 300. Exemplarily, the material of the insulating film is a polyester film also known as Mylar film. It should be understood that the insulating film in this embodiment can protect the battery cell 310 from completely contacting the battery housing 100, and prevent the negative pole ear 312 from being connected to the battery housing 100, causing housing corrosion.

[0067] After the battery cell 310 is assembled, the pole ear portion 312 is naturally closed on the outside of the insulating shaping plate 400 to a stable state. Then, the assembled battery cell 310 can be wrapped with an insulating film and loaded into the battery housing 100. It should be understood that after the battery cell 310 is assembled, the cap plate assembly 200 and the battery housing 100 need to be sealed, and the single battery needs to be injected with liquid.

[0068] In one embodiment, the thickness of the insulating shaping plate 400 is 1 mm to 3 mm along the arrangement direction of the battery body 311 and the cover assembly 200. And / or, along the thickness direction of the battery 310, the width of the insulating shaping plate 400 is 2 mm to 5 mm smaller than the maximum width of the cover assembly 200. It should be understood that if the thickness and width of the insulating shaping plate 400 are too large, it will affect the core and shell, and if they are too small, it will affect the shaping effect. Exemplarily, the thickness of the insulating shaping plate 400 is 2 mm and the width is 34 mm.

[0069] It should be noted that, in the embodiment of the present application, the width of the insulating shaping plate 400 is smaller than the maximum width of the cover plate assembly 200, and the wider and harder insulating shaping plate 400 supports and fixes the pole ear portion 312 of the battery cell 310, so that the pole ear portion 312 is gathered into a fixed shape, which can effectively reduce the pole ear redundancy inside the pole ear portion 312. Accordingly, the single battery provided in the embodiment of the present application can effectively reduce the risk of the pole ear being inserted into the battery body 311 and causing a short circuit inside the battery cell 310, so as to improve the structural performance and safety performance of the battery and extend the service life.

[0070] It is worth noting that the width of the insulating shaping plate 400 can be preferably set to be greater than the width of the adapter 600 to ensure that the insulating shaping plate 400 effectively exerts a shaping effect on each part of the pole ear portion 312.

[0071] In one embodiment, along the width direction of the pole ear portion 312, the length of the insulating shaping plate 400 is the same as the width of the pole ear portion 312. The width direction of the pole ear portion 312 is perpendicular to the arrangement direction of the battery cell body 311 and the cap plate assembly 200, and the width direction of the pole ear portion 312 is perpendicular to the thickness direction of the battery cell 310. In this embodiment, the length of the insulating shaping plate 400 is consistent with the width of the pole ear portion 312 to ensure that the insulating shaping plate 400 can fully shape and close the multi-layer pole ears in the pole ear portion 312.

[0072] In one embodiment, the insulating shaping plate 400 is a hard plastic plate made of PET.

[0073] In one embodiment, the corners of the insulating shaping plate 400 have arc chamfers to avoid scratching the tabs in the tab portion 312 , thereby improving the structural performance of the single battery.

[0074] In one embodiment, the cover plate assembly 200 is provided with a liquid injection hole, and the insulating shaping plate 400 is provided with a through hole at a position corresponding to the liquid injection hole. Figure 8 and Fig. 9 As shown, the edge of the insulating shaping plate 400 is provided with a through hole to form a slotted structure. It should be understood that the structure and shape of the through hole can be set according to the needs and is not limited to Figure 8 As shown, for example, the through hole may not be connected to the edge of the insulating shaping plate 400 and may be a complete hole structure.

[0075] In addition, the grooves on the surface of the insulating shaping plate 400 can also reduce material cost and weight, thereby reducing the production cost of the single cell and reducing the overall quality of the product.

[0076] In one embodiment, the battery cell 310 is a wound battery cell 310 .

[0077] Specifically, the battery body 311 includes a negative electrode sheet, a positive electrode sheet and a separator, wherein the separator separates the positive electrode sheet and the negative electrode sheet to avoid short circuit. Taking the negative electrode sheet as an example, the negative electrode sheet includes a foil and an active material coated on at least one side of the foil, and the uncoated portion of the foil forms a pole ear. In the process of winding to form the wound battery cell 310, the multi-layer pole ears led out from the negative electrode sheet form a negative pole ear portion 312, and similarly, the multi-layer pole ears led out from the positive electrode sheet form a positive pole ear portion 312.

[0078] In this embodiment, in order to reduce the cost of materials, the separator generally adopts a non-adhesive separator. It is worth noting that the battery cell 310 prepared by using a non-adhesive separator is prone to the problem of false hot pressing. During the manufacturing process, the multi-layered pole ears in the pole ear part 312 are more scattered and difficult to be gathered into a fixed shape.

[0079] When the insulating shaping plate 400 provided in the single cell of the embodiment of the present application is used, the pole ear portion 312 can be better gathered into a fixed shape to effectively reduce the redundancy of the pole ear portion 312. Moreover, the use of this solution can effectively reduce the risk of the pole ear portion 312 being inserted into the battery body 311, causing a short circuit inside the battery cell 310. At the same time, this structural setting can also reduce the occurrence of short-circuit points formed by the pole ear inserted into the pole piece area inside the battery body 311 during use, which can improve the structural performance and safety performance of the single cell and extend the service life.

[0080] In a second aspect, an embodiment of the present application provides a battery, which includes a single cell provided by any technical solution in the first aspect.

[0081] It should be noted that in the battery provided in the embodiment of the present application, the single cell can gather the pole ear portion 312 into a fixed shape by using the insulating shaping plate 400, which can effectively reduce the redundancy of the pole ear portion 312. Moreover, the use of this solution can effectively reduce the risk of the pole ear portion 312 being inserted into the battery body 311, causing a short circuit inside the battery cell 310. At the same time, this structural setting can also reduce the occurrence of a short-circuit point formed by the pole ear inserted into the pole piece area inside the battery body 311 during use, which can improve the structural performance and safety performance of the single cell and the battery, and extend the service life.

[0082] In a third aspect, an embodiment of the present application provides an electric device, which includes a battery provided by any technical solution in the second aspect.

[0083] It should be noted that in the electric device provided in the embodiment of the present application, the single cell in the battery can gather the pole ear portion 312 into a fixed shape by using the insulating shaping plate 400, which can effectively reduce the redundancy of the pole ear portion 312. Moreover, the use of this solution can effectively reduce the risk of the pole ear portion 312 being inserted into the battery body 311, causing a short circuit inside the battery cell 310. At the same time, this structural setting can also reduce the occurrence of the situation where the pole ear is inserted into the pole piece area inside the battery body 311 during use to form a short circuit point, which can improve the structural performance and safety performance of the single cell and the battery, and extend the service life.

[0084] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0085] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A single cell battery, characterized in that: include: a battery housing having an opening; A cover plate assembly, the cover plate assembly being buckled to the opening; A battery cell assembly, the battery cell assembly is placed inside the battery housing; the battery cell assembly includes at least one battery cell, the battery cell includes a battery cell body and two pole ear parts extending from the battery cell body, the pole ear parts include multiple layers of stacked pole ears; An insulating shaping plate, wherein the insulating shaping plate is located between the cover plate assembly and the battery cell body and is fixed relative to the cover plate assembly; the pole ear portion is electrically connected to the cover plate assembly from the battery cell body through the side end surface of the insulating shaping plate, and at least part of the pole ear in the pole ear portion is in contact with the side end surface of the insulating shaping plate.

2. The single cell according to claim 1, characterized in that: Along the thickness direction of the battery cell body, the pole ear portion is led out of the battery cell body from the middle of the battery cell body to one side wall of the battery cell body; along the thickness direction of the battery cell body, the size of the side end surface of the insulating shaping plate from the middle of the battery cell body where the pole ear portion is led out is L, and the size from the middle of the battery cell body to one side wall of the battery cell body is D / 2, and the ratio of L to D / 2 is 90% to 100%.

3. The single cell according to claim 1, characterized in that: The two pole ear parts are located on the same side of the battery core body and are arranged at intervals; each pole ear part is shaped by one of the insulating shaping plates.

4. The single cell according to claim 3, characterized in that: Of the two pole lugs, one is a positive pole lug and the other is a negative pole lug; the insulating shaping plate corresponding to the positive pole lug and the insulating shaping plate corresponding to the negative pole lug are independently arranged.

5. The single cell according to claim 4, characterized in that: The battery cell assembly includes two battery cells, and the two battery cells are stacked along the thickness direction of the battery cells; and in the two battery cell assemblies, the pole ears with the same polarity share the same insulating shaping plate.

6. The single cell according to any one of claims 1 to 5, characterized in that: It also includes an insulating film, which is wrapped around the outer surface of the battery core assembly.

7. The single cell according to any one of claims 1 to 5, characterized in that: The insulating shaping plate and the cover plate assembly are bonded together by an adhesive; Alternatively, the single battery cell further includes a transition piece, and the pole ear portion and the cover plate assembly are transitioned through the transition piece; and the insulating shaping plate and the transition piece are bonded to each other through an adhesive.

8. The single cell according to claim 7, characterized in that: The adhesive member is a double-sided adhesive.

9. The single cell according to any one of claims 1 to 5, characterized in that: Along the arrangement direction of the battery cell body and the cover plate assembly, the thickness of the insulating shaping plate is 1 mm to 3 mm; And / or, along the thickness direction of the battery core, the width of the insulating shaping plate is 2 mm to 5 mm smaller than the maximum width of the cover plate assembly; And / or, along the width direction of the pole ear portion, the length of the insulating shaping plate is the same as the width of the pole ear portion, the width direction of the pole ear portion is perpendicular to the arrangement direction of the battery cell body and the cover plate assembly, and the width direction of the pole ear portion is perpendicular to the thickness direction of the battery cell.

10. The single cell according to any one of claims 1 to 5, characterized in that: The corners of the insulating shaping plate are provided with arc chamfers; the cover plate assembly is provided with a liquid injection hole, and the insulating shaping plate is provided with a through hole at a position corresponding to the liquid injection hole.

11. The single cell according to any one of claims 1 to 5, characterized in that: The battery core is a wound battery core.

12. A battery, characterized in that: It comprises a single cell as claimed in any one of claims 1 to 11.

13. An electrical device, characterized in that: Comprising the battery of claim 12.

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