Battery monomer, battery module, battery pack and electric equipment

Abstract

The utility model provides a battery monomer, a battery module, a battery pack and electric equipment, the battery monomer comprises a shell and a battery core assembly accommodated in the shell, the shell comprises a first wall used for being supported in a box body, and a second wall used for being supported in the box body; a second wall facing the first wall in the thickness direction of the first wall; the third wall is respectively connected with the first wall and the second wall and jointly limits a cavity used for accommodating a battery cell assembly, the outer surface of the first wall is covered with a first insulating part, and the first insulating part is insulating glue comprising a base material layer and a UV glue layer which are stacked with each other. According to the battery monomer provided by the invention, the problem that the insulating part is stripped due to vibration or impact can be avoided, so that the operation safety and reliability of the battery pack can be improved.

Description

Technical Field

[0001] This application relates to the field of power battery and energy storage technology, specifically to a battery cell, a battery module including such a battery cell, a battery pack, and electrical equipment. Background Technology

[0002] Power batteries, such as automotive power battery packs, can be composed of a number of stacked battery cells connected in series and parallel. The casing of each battery cell is typically made of metal, and an insulating element may be provided on the outside of each battery cell's casing to maintain insulation between adjacent battery cells and between the battery cell and surrounding devices. For example, a battery cell known in the prior art has an insulating film on the outer surface of its casing, and the outer surface with the insulating film is then glued to the bottom plate of the housing.

[0003] It is worth looking forward to modifying the individual battery cells contained in the battery pack to further improve the battery pack in terms of manufacturing process or safety of use.

[0004] It should be noted that the content described herein is only to provide background information in relation to this disclosure and does not necessarily belong to the prior art. Utility Model Content

[0005] Depending on the specific aspects, the purpose of this application is to provide an improved battery cell, battery module, battery pack, and electrical device, wherein the battery cell can help improve the operational safety, reliability, and manufacturing process of the battery pack manufactured therefrom.

[0006] In addition, this application aims to solve or alleviate other technical problems existing in the prior art.

[0007] According to a first aspect of this application, a battery cell is provided, comprising a housing and a cell assembly housed within the housing, wherein the housing comprises:

[0008] The first wall serves to support the box;

[0009] The second wall is opposite to the first wall along the thickness direction of the first wall;

[0010] A third wall, which is connected to both the first and second walls and together defines the chamber for housing the battery cell assembly,

[0011] The outer surface of the first wall is covered with a first insulating element, which is an insulating adhesive comprising a substrate layer and a UV adhesive layer stacked on top of each other.

[0012] In the battery cell proposed according to the first aspect of this application, optionally, a third insulating element, which is an insulating film or an insulating coating, is covered on the outer surface of the third wall.

[0013] In the battery cell proposed according to the first aspect of this application, optionally, the first insulating member extends toward the third wall across the arcuate transition region between the first wall and the third wall, and covers the end region of the third wall adjacent to the first wall, where the first insulating member overlaps with the third insulating member.

[0014] Optionally, in the battery cell proposed according to the first aspect of this application, a flame-retardant element is further provided on the outer surface of the third wall, which has a clearance portion corresponding to the end region along the thickness direction of the third wall and is a thinned portion or a cut-off portion.

[0015] In the battery cell proposed according to the first aspect of this application, optionally, the first insulating member extends from the first wall along the thickness direction of the first wall until it covers at least a portion of the arcuate transition region between the second wall and the third wall.

[0016] In the battery cell proposed according to the first aspect of this application, optionally, the first insulating member extends from the first wall along the thickness direction of the first wall onto the second wall.

[0017] Optionally, in the battery cell proposed according to the first aspect of this application, the battery cell is square, and the third wall includes four sub-walls connected in sequence, including two opposing first sub-walls and two opposing second sub-walls, the area of ​​the first sub-walls being larger than that of the second sub-walls, wherein the first insulating member extends from the first wall to the two first sub-walls and / or to the two second sub-walls.

[0018] In the battery cell proposed according to the first aspect of this application, optionally, a positive electrode post and a negative electrode post are provided on the second wall at the same time, or a positive electrode post is provided on one of the second sub-walls and a negative electrode post is provided on the other of the second sub-walls.

[0019] In the battery cell proposed according to the first aspect of this application, optionally, the third insulating member extends along the thickness direction of the first wall onto the first wall, wherein, on the first wall, the end region of the third insulating member overlaps with the first insulating member.

[0020] In the battery cell proposed according to the first aspect of this application, optionally, the area of ​​the first wall covered by the exposed first insulating member accounts for 60% to 95% of the first wall.

[0021] Optionally, in the battery cell proposed according to the first aspect of this application, the second wall is provided with a second insulating member for fixing to the pressure strip and is an insulating adhesive comprising a substrate layer and a UV adhesive layer stacked on top of each other.

[0022] In the battery cell proposed according to the first aspect of this application, optionally, the second insulating member is integral with the first insulating member, wherein the first insulating member extends from the first wall along the thickness direction of the first wall onto the second wall.

[0023] According to a second aspect of this application, a battery module is also proposed, which includes a plurality of the aforementioned battery cells, the plurality of battery cells being stacked along a predetermined direction.

[0024] According to a third aspect of this application, a battery pack is also provided, which includes a housing and a plurality of the aforementioned battery cells, wherein the plurality of battery cells are stacked along a predetermined direction and respectively supported in the housing.

[0025] According to a fourth aspect of this application, an electrical device is also proposed, which includes the aforementioned battery cell, or the aforementioned battery module, or the aforementioned battery pack.

[0026] Here, the battery cell according to this disclosure can avoid the problem of insulation stripping due to vibration or impact, thereby improving the operational safety and reliability of the battery pack. Attached Figure Description

[0027] Referring to the accompanying drawings, the above and other features of this application will become apparent, wherein,

[0028] Figure 1 An embodiment of a battery cell according to this application is shown, wherein corresponding insulating elements on the outer surface of the casing are removed;

[0029] Figure 2 An embodiment of a battery cell according to this application is shown, which has a corresponding insulating element covering the outer surface of the housing;

[0030] Figure 3 This shows the basis from another perspective. Figure 2 Battery cells;

[0031] Figure 4 Another embodiment of the battery cell according to this application is shown, which also has a second insulating element;

[0032] Figure 5 Another embodiment of the battery cell according to this application is shown;

[0033] Figure 6 It shows according to Figure 5 The battery cell, in which some of the insulating parts on the outer surface of the casing have been removed;

[0034] Figure 7 Another embodiment of the battery cell according to this application is shown;

[0035] Figure 8 An embodiment of the battery module according to this application is shown. Detailed Implementation

[0036] It is readily understood that, based on the technical solution of this application, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this application. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this application and should not be considered as the entirety of this application or as limitations or restrictions on the technical solution of this application.

[0037] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," "third," and similar expressions are used for descriptive and distinguishing purposes only and should not be construed as indicating or implying the relative importance of the corresponding components.

[0038] First, it should be noted that the battery cell mentioned in this disclosure has the following structure: it includes an outer casing and an internal cell assembly housed within the casing. The battery cell may be, but is not limited to, a lithium-ion battery cell, such as a primary lithium-ion battery or a secondary lithium-ion battery. Furthermore, the battery cell may be, but is not limited to, a prismatic battery cell or a cylindrical battery cell. Specifically, in a prismatic battery cell, a positive electrode and a negative electrode are provided on the same side or the same wall of the battery cell, i.e., they are arranged adjacent to each other. Alternatively, in the prismatic battery, the positive electrode and the negative electrode are separately located on opposite sides or walls, i.e., they are opposite to each other, such as a blade battery, such as a short blade battery or a long blade battery. In the cylindrical battery cell, the side surface of its casing is a circular surface.

[0039] The housing of the battery cell comprises the following components, the parts of which together form a closed chamber for accommodating the cell assembly. Specifically, the first wall, the second wall, and the third wall mentioned herein together enclose the closed chamber.

[0040] The battery module or battery pack mentioned in this disclosure is a unit or component having a certain number of battery cells that are electrically connected to each other. For example, the certain number of battery cells can be assembled into a battery pack using CTM (Cell to Module) technology, CTP (Cell to Pack) technology, or CTC (Cell to Chassis) technology.

[0041] Furthermore, the electrical equipment mentioned in this disclosure refers to equipment that has an energy storage device and an electrical consumer that requires power from the energy storage device. This electrical equipment may be, but is not limited to, new energy vehicles, including pure electric vehicles and hybrid electric vehicles.

[0042] Figure 1 One embodiment of the battery cell according to this application is shown with the corresponding external insulating components removed. The battery cell 100 is a prismatic battery, which includes a casing and a cell assembly (not shown) housed therein. The internal cell assembly is mainly composed of positive and negative electrodes of opposite polarity, and optionally an insulating component located between them, stacked or wound. The casing may be made of aluminum and filled with an electrolyte.

[0043] The present application will be described in detail below with reference to the square battery shown. The content described here for the square battery can be similarly applied to the cylindrical battery cell according to the present application.

[0044] from Figure 1 As can be seen, the casing of the battery cell 100 includes a first wall 110 (which is in Figure 3 (shown in the image), second wall 120 and third wall 130. Here, from... Figure 1 From this perspective, the first wall 110 can also be called the bottom wall, the second wall 120 can also be called the top wall, and the third wall 130 can also be called the side wall. The second wall 120 is along the thickness direction of the first wall 110 (i.e., the Z direction). Figure 1 The third wall 130 (represented by double arrows) is opposite to the first wall 110. The third wall 130 includes four interconnected sub-walls in the circumferential direction, comprising two larger first sub-walls (i.e., large surfaces) and two smaller second sub-walls (i.e., small surfaces) opposite each other. The third wall 130 is connected to the first wall 110 and the second wall 120 at both ends along the Z-direction. The first wall 110, the second wall 120, and the third wall 130 together form a chamber in which the battery cell assembly is housed and enclosed.

[0045] exist Figure 1In this design, two terminals 121 (one positive and the other negative) that are electrically connected to the internal battery cell assembly are simultaneously located on the second wall 120. An explosion-proof valve 122 is also provided on the second wall 120. Here, the second wall 120 serves as a cover and is constructed separately from the third wall 130. The battery cell assembly can be inserted into the space defined by the first wall 110 and the third wall 130 from the side where the cover is located. Subsequently, the battery cell assembly is enclosed in the space by connecting the cover to the third wall 130, for example, by welding.

[0046] Unlike Figure 1 Alternatively, the two terminals 121 can be arranged opposite to each other. For example, the positive terminal is located on one of the second sub-walls, and the negative terminal is located on the other second sub-wall, wherein the second sub-walls serve as the aforementioned cover plates, and the cell assembly can be inserted from the side where it is located and enclosed in the housing.

[0047] In the battery cell 100 according to this application, a first wall 110 is used to fix and support the battery cell within the housing of the battery pack, i.e., to fix the battery cell as a whole into the housing. A first insulating member (referred to as "111" in other figures) is covered on the outer surface of the first wall 110, extending toward the third wall 130 and covering at least a portion of the arcuate transition region (also referred to as the rounded corner region) located between the first wall 110 and the third wall 130. The "outer surface" of the housing or its components, as mentioned herein, refers to the side facing away from the internal cell assembly. By extending the first insulating member 111 from the first wall 110 into the arcuate transition region between the first wall 110 and the third wall 130, the insulation reliability of the battery cell is ensured.

[0048] In one specific embodiment, the first insulating member 111 extends from the first wall 110 into the arcuate transition region (located between the first wall 110 and the third wall 130) by at least 0.2 mm, particularly 1 mm to 2 mm. That is, the area covered by the first insulating member 111 in the arcuate transition region between the first wall 110 and the third wall 130 is a rectangular ring with a width of at least 0.2 mm, particularly 1 mm to 2 mm.

[0049] The first insulating component 111 is an insulating adhesive, which includes a substrate layer and a UV adhesive layer stacked on top of each other. When the insulating adhesive is tacky on one side and contains a single substrate layer and a single UV adhesive layer, the UV adhesive layer is bonded to the outer surface of the first wall 110, and the substrate layer is bonded to the support plate of the housing by the adhesive.

[0050] The UV adhesive layer of the insulating adhesive 111, serving as the first insulator, is directly bonded to the first wall 110. Its shear strength is at least 7 MPa, and can reach, for example, 12 MPa. This prevents the insulation from peeling off due to vibration or impact on the battery cells, thereby improving the operational safety and reliability of the battery pack. Furthermore, regarding the manufacturing process of the battery cells, the insulating adhesive 111 can share related equipment with commonly used insulating films, requiring minimal modification to existing production lines and significantly reducing the cost of manufacturing equipment.

[0051] For example, the substrate layer of the insulating adhesive used as the first insulating element 111 may include, but is not limited to, PET (polyethylene terephthalate) film, PI (polyimide) film, PP (polypropylene) film, PVC (polyvinyl chloride) film, PE (polyethylene) film, and PC (polycarbonate) film.

[0052] For example, the UV adhesive layer of the insulating adhesive serving as the first insulating element 111 may include epoxy resin, photoinitiator, and optionally dye, which are applied to the substrate layer and then formed by UV light activation, UV light curing, or any other feasible method.

[0053] For example, the thickness of the insulating adhesive serving as the first insulating element 111 may be in the range of 0.02 mm to 0.5 mm, particularly in the range of 0.1 mm to 0.15 mm. It should be understood that the thickness of the insulating adhesive is merely exemplary and not limiting, and can be selected to match the insulating elements on other parts of the housing.

[0054] Figure 2 and Figure 3 One embodiment of the battery cell according to this application is shown from different perspectives. A third insulating member 131 is provided on the third wall 130, extending from two opposing first sub-walls of the third wall 130 to two opposing second sub-walls, i.e., it includes a section located on the outer surface of the first sub-walls and a section located on the outer surface of the second sub-walls. A first insulating member 111 is substantially U-shaped and covers and adheres to the outer surface of the battery cell housing, i.e., it includes a section located on the outer surface of the first wall 110 and two sections located on the outer surfaces of the two opposing second sub-walls of the third wall 130. Specifically, the first insulating member 111 covers the first wall 110 and extends along the Z direction on the two opposing second sub-walls (i.e., facets) until it covers the arcuate transition region between the second wall 120 and the third wall 130, i.e., the first insulating member extends through the entire height of the second sub-walls in the Z direction and reaches the second wall 120.

[0055] exist Figure 2 and Figure 3In this design, the first insulating member 111 and the third insulating member 131 have overlapping areas on the second sub-wall, that is, the end region of the third insulating member 131 and the end region of the first insulating member 111 overlap on the second sub-wall. In the overlapping portion, the outer surface of the first insulating member 111 is covered by the third insulating member 131, or vice versa.

[0056] from Figure 3 It can also be seen that the third insulating member 131 extends beyond the arcuate transition region between the third wall 130 and the first wall 110, and the end region of the third insulating member 131 overlaps with the first insulating member 111 on the first wall 110. Here, the overlapping portion of the third insulating member 131 and the first insulating member 111 is located on the first wall 110, which is beneficial for controlling the stacking size during the battery cell stacking process. The first sub-wall (i.e., the large surface) is typically used as the stacking surface, and adjacent battery cells in the battery pack face each other with said stacking surface (see...). Figure 8 ).

[0057] Figure 4 A modified embodiment of the aforementioned U-shaped first insulating member is shown. The first insulating member 111 covers the entire second sub-wall and extends along the Z-direction to the vicinity of the second wall 120. On one hand, the first insulating member 111 extends from the second sub-wall through the arcuate transition region between the second sub-wall and the first sub-wall, and covers the end region of the first sub-wall adjacent to the second sub-wall. On the other hand, the first insulating member 111 extends across the arcuate transition region between the first wall 110 and the first sub-wall, and covers the end region of the first sub-wall adjacent to the first wall 110. At the two end regions, the first insulating member 111 and the third insulating member 131 have overlapping portions; for example, the first insulating member 111 covers the outer surface of the third insulating member 131, or vice versa.

[0058] Corresponding to regarding Figure 4 The overlapping portion at the aforementioned end region has a flame-retardant element 140 provided on the outer surface of the third insulating member 131 on the first sub-wall (see [link]). Figure 8 It has a clearance portion. The clearance portion is along the thickness direction of the first sub-wall (i.e., the stacking direction, see...). Figure 8 The clearance portion (in the X direction) corresponds to the aforementioned end region, or to the overlapping portion at that end region. The clearance portion is a thinning portion, meaning the thickness of the flame-retardant element along the stacking direction is reduced. Alternatively, the clearance portion is a cut-off portion, meaning the portion of the flame-retardant element along the stacking direction corresponding to the end region (or the overlapping portion therein) is cut off. Exemplarily, in combination with... Figure 8The aforementioned clearance portion is a cut-off portion, and is configured such that the edge of the flame-retardant element 140 substantially coincides with the edge of the end region (or the overlapping portion therein), meaning that the flame-retardant element does not extend to the end region (or the overlapping portion therein). In a battery module or battery pack, the flame-retardant element 140 is sandwiched between two adjacent battery cells and bonded to adjacent first sub-walls (i.e., large surfaces, or also referred to as stacked surfaces) on both sides, for example, by means of Figure 8 The adhesive tape 141 shown is used for bonding. Here, the clearance portion allows the overall dimensions of the battery cells to remain consistent. For example, in lithium-ion batteries, the clearance portion avoids the risk of lithium plating during cycling due to stress concentration.

[0059] The flame-retardant element 140 is used to prevent or slow down heat transfer to adjacent battery cells. Exemplarily, the flame-retardant element may be a sheet or plate comprising a compressible material, such as aerogel, filled therein. Optionally, a frame strip for fixing and supporting is provided at the outer edge of the compressible material. The structure of the flame-retardant element can be modified as needed, and the embodiments of this application are not limited thereto.

[0060] It should be understood that the above-described embodiments regarding the flame-retardant element and its end region with the first sub-wall are merely exemplary and not limiting, and can be modified as needed. For example, it is feasible for the first insulating member 111 and the third insulating member 131 to overlap at any position along the Z-direction of the first sub-wall, and correspondingly, the flame-retardant element 140 is provided with the aforementioned clearance portion at a position along the thickness direction of the first sub-wall corresponding to the overlapping portion. Furthermore, it is also feasible for the first insulating member 111 and the third insulating member 131 to overlap at the end region of the second sub-wall or at any position along the Z-direction of the second sub-wall, and correspondingly, the flame-retardant element 140 is fixed to the second sub-wall and is provided with the aforementioned clearance portion at a position along the thickness direction of the second sub-wall corresponding to the overlapping portion.

[0061] from Figure 4 It can also be seen that a second insulating element 123 is provided on the second wall 120, which covers the area of ​​the second wall 120 excluding the pole post 121, the explosion-proof valve 122, and other components. The second insulating element 123 is an insulating sheet, which is fixed, in particular, adhered to the second wall 120. The insulating sheet may be made of PC (polycarbonate), PET (polyethylene terephthalate), PP (polypropylene), or PVC (polyvinyl chloride), among which PC is easy to process and has good insulation, flame retardant, and wear resistance properties.

[0062] In one alternative embodiment, the second insulating element 123 is an insulating film adhered to the second wall 120. The insulating film may include, but is not limited to, PET (polyethylene terephthalate) film, PP (polypropylene) film, or PVC (polyvinyl chloride) film, wherein the thickness of the insulating film may be 20 μm-200 μm.

[0063] In one alternative embodiment, the second insulating element 123 is an insulating coating, which may involve, but is not limited to, acrylic resin, epoxy resin, or polyurethane resin. This insulating coating can be formed by applying insulating material to the second wall 120 by spraying, inkjet printing, or 3D printing and then curing, particularly by photocuring (e.g., UV curing), wherein the thickness of the insulating coating can be 20 μm-250 μm. Here, the insulating coating has improved shear resistance, tensile strength, and insulation properties, and it can be tightly bonded to the outer surface of the second wall, thereby ensuring the operational safety and reliability of the battery pack.

[0064] In an alternative embodiment, the second insulating element 123 is or includes the aforementioned insulating adhesive, comprising a substrate layer and a UV adhesive layer stacked on top of each other. Here, the insulating adhesive can be used to secure the battery cells within the same group relative to each other. In this way, the overall structural strength is improved, preventing the battery cells from shifting within it.

[0065] Exemplarily, the insulating adhesive used to fix the strip may be located in the edge region of the second wall 120, wherein the insulating adhesive is confined by a third insulating member 131 extending from the third wall 130 or a first insulating member 111, or is integral with a first insulating member 111 extending from the first wall 110 along the Z direction to the second wall 120. It should be understood that the location and quantity of the insulating adhesive on the second wall for fixing the strip can be selected as needed; for example, it may also be located in the middle region of the second wall, and its quantity may be one, two, or more.

[0066] For example, when the second insulating member 123 includes both the insulating sheet and the insulating adhesive, the insulating adhesive is located in the edge region of the second wall 120 adjacent to the second sub-wall, and is simultaneously limited by the edge of the third insulating member 131 extending from the second sub-wall and the edge of the insulating sheet.

[0067] Alternatively, when the second insulating member 123 includes both the aforementioned insulating sheet and insulating adhesive, a hollow area is formed on the insulating sheet, and the insulating adhesive is adhered to the outer surface of the second wall 120 along the Z direction corresponding to the hollow area, which is used to fix it to the pressure strip.

[0068] In one alternative embodiment, the insulating adhesive on the second wall 120 for fixing to the pressure strip is single-sided adhesive, wherein a single UV adhesive layer is bonded to the outer surface of the second wall 120, while a single substrate layer is bonded to the pressure strip, for example, by means of additional adhesive.

[0069] Alternatively, the insulating adhesive used to fix the pressure strip on the second wall 120 is double-sided adhesive, comprising a first UV adhesive layer, a substrate layer, and a second UV adhesive layer stacked on top of each other. The first UV adhesive layer is bonded to the outer surface of the second wall 120, and the second UV adhesive layer is bonded to the pressure strip. With this double-sided adhesive, it can be fixed to both the battery cell and the pressure strip by its own adhesion, simplifying the battery pack manufacturing process.

[0070] Regarding the double-sided adhesive insulating adhesive used to fix the pressure strip on the second wall 120, it is also feasible to have an adhesive strength between the insulating adhesive and the outer surface of the second wall 120 greater than or equal to the adhesive strength between the insulating adhesive and the pressure strip. Therefore, even if the pressure strip is subjected to vibration and impact and peels off from the insulating adhesive, the insulating adhesive can still be adhered to the second wall 120 on the other side, thereby effectively ensuring the insulation of the battery cells and the operational safety and reliability of the battery pack.

[0071] The second insulating element 123 can be constructed separately from the insulating element on the third wall 130. The second insulating element is in contact with or has an overlapping portion with the third insulating element or the first insulating element extending to the third wall.

[0072] Regarding the second insulating member 123, it is also feasible that the second insulating member 123 may be integral with the insulating member on the third wall 130. Exemplarily, in Figure 4 Based on this, it is understood that the third insulating element 131 on the first sub-wall of the third wall 130 and the first insulating element 111 on the second sub-wall respectively extend to the second wall 120 and together cover the area excluding the pole post 121, the explosion-proof valve 122, or other devices. It is also feasible that the third insulating element 131 on the first sub-wall of the third wall 130 extends to the second wall 120 and covers the area excluding the pole post 121, the explosion-proof valve 122, or other devices. It is also feasible that the first insulating element 111 on the second sub-wall of the third wall 130 respectively extends to the second wall 120 and covers the area excluding the pole post 121, the explosion-proof valve 122, or other devices. Here, the third insulating element 131 may be the aforementioned insulating coating or insulating film, or a combination of both.

[0073] Figure 5 and Figure 6 This illustrates another embodiment of the battery cell according to this application, wherein, in Figure 6The third insulating element has been removed, and only the first insulating element 111 is shown. (Compared to...) Figure 4 The implementation method differs in that the first insulating member 111 extends from the first wall 110 through two opposing first sub-walls to the second wall 120; the third insulating member 131 covers the two opposing second sub-walls of the third wall 130. Here, by providing insulating adhesive on the larger area of ​​the first sub-wall (large surface), the insulation reliability of the battery cell can be improved, thereby improving the operational reliability and safety of the battery pack.

[0074] from Figure 6 As can be seen, the first insulating member 111 also extends to the second sub-wall and has an overlapping portion with the third insulating member thereon. That is, the first insulating member includes a section located on the first wall 110, a section located on the two opposite first sub-walls, and a section located on the two opposite second sub-walls.

[0075] In an embodiment not shown, the first insulating member 111 does not extend beyond the arcuate transition region between the first sub-wall and the second sub-wall. Furthermore, it is also possible for the first insulating member 111 and the third insulating member 131 to have overlapping portions in the region of the second sub-wall adjacent to the first sub-wall.

[0076] It should be understood that the embodiment described above for the first insulating member 111 that U-shapedly covers the outer surface of the housing is merely exemplary and not limiting, and modifications can be made as needed. Exemplarily, the first insulating member 111 extends from the first wall 110 to a portion of the two opposing sub-walls of the third wall 130 that it connects to, i.e., the first insulating member 111 covers only a portion of these two sub-walls along the Z direction. Exemplarily, it is also possible that the sections of the first insulating member 111 that U-shapedly covers the outer surface of the housing on the two opposing sub-walls are not necessarily symmetrical.

[0077] It should also be understood that, instead of the above-described embodiment of the first insulating member covering the outer surface of the housing in a U-shape, it is also possible for the first insulating member 111 to extend from the first wall 110 to one of the four sub-walls of the third wall 130, or to three of the sub-walls, or to all four sub-walls.

[0078] Figure 7 Another embodiment of the battery cell according to this application is shown from an oblique perspective. In this embodiment, a third insulating member 131 covers the entire area of ​​the third wall 130, extends along the Z direction onto the first wall 110, and overlaps with the first insulating member 111 thereon. The third insulating member 131 extends beyond the arcuate transition region between the third wall 130 and the first wall 110; that is, the third insulating member 131 on the first wall 110 is rectangular and has a certain width.

[0079] In one alternative embodiment, the area of ​​the first wall 110 covered by the exposed first insulating member 111 accounts for 60% to 95% of the first wall 110, that is, 60% to 95% of the area of ​​the first wall 110 is secured in the housing by the first insulating member 111. Exemplarily, the area of ​​the first wall 110 covered by the exposed first insulating member 111 accounts for 85% to 95%, or 90% to 95%. Here, "exposed first insulating member" refers to a first insulating member whose outer surface is not covered by the third insulating member 131.

[0080] exist Figure 7 In the illustrated embodiment, the third insulating member 131 may be the insulating film described above, which is adhered and covered onto the third wall 130. Alternatively, the third insulating member 131 may be the insulating coating described above.

[0081] It should be understood that the above arrangement of the first insulating member 111 on the first wall 110 is merely exemplary and not limiting. For example, the first insulating member 111 may cover the entire area of ​​the first wall 110. However, the following implementation is not excluded: there may be exposed metal areas on the first wall 110 that are not covered by the first insulating member, which can directly contact the colloid during the manufacturing process of the battery pack, thereby improving the fixation strength of the battery cells in the housing. The size and location of the exposed metal areas depend on the required anti-creep performance.

[0082] Figure 8 This illustration shows a battery module according to a second aspect of this application, wherein, for clarity, only two battery cells 100 and a flame-retardant element 140 located therebetween are shown, the battery cells having... Figure 4 The embodiment shown is described above. The battery module includes multiple battery cells according to at least one embodiment of the embodiments described above, which are arranged along a predetermined direction (i.e., the X direction). Figure 8 (Indicated by double arrows) Arrangement and stacking. Exemplarily, each battery cell 100 in the same battery module is fixed and supported on the support plate of the housing by the first insulating member 111 on the first wall 110 below it, and is fixed above by insulating adhesive and pressure strips that are optionally present.

[0083] In particular, the advantages and features described in relation to the battery module according to this application are evident from the battery cell according to this application, and reference can be made accordingly to the description made in relation to the battery cell according to this application.

[0084] According to a third aspect of this application, a battery pack is also proposed, comprising a housing and a plurality of battery cells according to at least one of the embodiments described above. The battery pack may be a high-voltage battery pack, for example, used as a power battery in a new energy vehicle, or it may be a low-voltage battery pack, for example, used in a new energy vehicle to provide electrical energy for the implementation of corresponding functions during vehicle hibernation. Furthermore, the battery pack typically includes other accessories such as power distribution devices, sampling devices, and pressure relief devices, which will not be described in detail and are not limited thereto.

[0085] In the battery pack, multiple battery cells 100 are stacked along a predetermined direction and supported in the housing by their respective first walls 110.

[0086] For example, in a battery pack, the first wall 110 of the battery cell 100 may be bonded to a support plate at the bottom of the housing for support within the housing. The support plate may be, for example, a heat exchange plate.

[0087] In another embodiment, it is also possible that, in the battery pack, the first wall 110 of the battery cell 100 can be bonded to a support plate above the housing so as to be supported in the housing.

[0088] In another embodiment, it is also possible for a portion of the vehicle chassis to form part of the housing, for example, a portion of the vehicle floor is part of the housing. Here, the first wall 110 of the battery cell can be adhered to the upper vehicle floor for support within the housing. Alternatively, the first wall 110 of the battery cell 100 can be adhered to the lower vehicle floor for support within the housing.

[0089] In particular, the advantages and features described in relation to the battery cell according to this application are evident in the battery pack according to this application, and reference can be made accordingly to the description of the battery cell according to this application.

[0090] Finally, according to the fourth aspect of this application, an electrical device is also proposed, which includes the battery cells described above, or the battery modules described above, or the battery pack described above. This electrical device may be, but is not limited to, the new energy vehicles mentioned above.

[0091] In particular, the advantages and features described in relation to the battery cell according to this application are evident in the electrical equipment based on this application, and reference can be made accordingly to the description made in relation to the battery cell according to this application.

[0092] It should be understood that all the above preferred embodiments are exemplary and not restrictive, and various modifications, variations, or combinations made by those skilled in the art to the specific embodiments described above under the concept of this application should be within the scope of legal protection of this application.

Claims

1. A battery cell comprising a housing and a cell assembly housed within the housing, characterized in that, The housing includes: The first wall serves to support the box; The second wall is opposite to the first wall along the thickness direction of the first wall; A third wall, which is connected to both the first and second walls and together defines the chamber for housing the battery cell assembly, The outer surface of the first wall is covered with a first insulating element, which is an insulating adhesive comprising a substrate layer and a UV adhesive layer stacked on top of each other.

2. The battery cell according to claim 1, characterized in that, A third insulating element, which is an insulating film or an insulating coating, is covered on the outer surface of the third wall.

3. The battery cell according to claim 2, characterized in that, The first insulating member extends toward the third wall across the arcuate transition region between the first wall and the third wall, and covers the end region of the third wall adjacent to the first wall, where the first insulating member overlaps with the third insulating member.

4. The battery cell according to claim 3, characterized in that, A flame-retardant element is also provided on the outer surface of the third wall, which has a clearance portion that corresponds to the end region along the thickness direction of the third wall and is a thinning portion or a cut-off portion.

5. The battery cell according to claim 1, characterized in that, The first insulating element extends from the first wall along the thickness direction of the first wall until it covers at least a portion of the arcuate transition region between the second wall and the third wall.

6. The battery cell according to claim 5, characterized in that, The first insulating element extends from the first wall along the thickness direction of the first wall onto the second wall.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The battery cell is square, and the third wall includes four sub-walls connected in sequence, including two opposing first sub-walls and two opposing second sub-walls. The area of ​​the first sub-wall is larger than that of the second sub-wall. The first insulating member extends from the first wall to the two first sub-walls and / or to the two second sub-walls.

8. The battery cell according to claim 7, characterized in that, A positive electrode post and a negative electrode post are provided on the second wall at the same time, or a positive electrode post is provided on one of the second sub-walls and a negative electrode post is provided on the other of the second sub-walls.

9. The battery cell according to claim 2, characterized in that, The third insulating member extends along the thickness direction of the first wall onto the first wall, wherein the end region of the third insulating member overlaps with the first insulating member on the first wall.

10. The battery cell according to claim 9, characterized in that, The area of ​​the first wall covered by the exposed first insulating element accounts for 60% to 95% of the first wall.

11. The battery cell according to claim 1, characterized in that, The second wall is provided with a second insulating element, which is used to fix it to the pressure strip and is an insulating adhesive comprising a substrate layer and a UV adhesive layer stacked on top of each other.

12. The battery cell according to claim 11, characterized in that, The second insulating member is integral with the first insulating member, wherein the first insulating member extends from the first wall along the thickness direction of the first wall onto the second wall.

13. A battery module, characterized in that, It includes a plurality of battery cells according to any one of claims 1 to 12, wherein the plurality of battery cells are stacked along a predetermined direction.

14. A battery pack, characterized in that, It includes a housing and a plurality of battery cells according to any one of claims 1 to 12, wherein the plurality of battery cells are stacked along a predetermined direction and respectively supported in the housing.

15. An electrical appliance, characterized in that, It includes a battery cell according to any one of claims 1 to 12, or a battery module according to claim 13, or a battery pack according to claim 14.

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