Battery monomer, battery module, battery pack and electric equipment

Abstract

The utility model provides a single battery, a battery module, a battery pack and electric equipment, and the single battery comprises a shell which defines at least one opening, the outer surface of the shell comprises a fixed surface and a non-fixed surface, and the fixed surface is used for fixing the single battery; the cover plate is fixed on the shell and is used for sealing the opening; an insulating coating is arranged on the fixed surface, an insulating film is coated on the non-fixed surface, functional areas are arranged on the outer surface of the shell and used for exposing the shell to the outside, the functional areas are selected from the following groups, the groups comprise contact areas, the contact areas are located on the fixed surface and / or the non-fixed surface, and the contact areas are in contact with the fixed surface and / or the non-fixed surface through the contact areas. The detection device can be connected to the outer surface of the shell; the clamping area is located on the non-fixed surface, and a clamping device can be clamped on the outer surface of the shell at the clamping area; and the identification area is positioned on the non-fixed surface, and parameter identifiers of the battery monomers are arranged on the identification area.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power batteries and energy storage technology, in particular to a battery monomer, a battery module comprising such a battery monomer, a battery pack and an electric device. BACKGROUND

[0002] A power battery, for example, a power battery pack for vehicles, can be formed by a certain number of battery monomers stacked with each other in series and parallel. The shell of each battery monomer is usually made of a metal material, for example, aluminum, wherein an insulating piece can be provided outside the shell of each battery monomer to maintain insulation between adjacent battery monomers and between the battery monomers and peripheral elements. For example, it is known from the prior art that an insulating film is provided on the outer surface of the shell of a battery monomer, and the outer surface provided with the insulating film is then glued to the bottom plate of the box.

[0003] Here, it is desirable to modify the battery monomers contained in the battery pack to further improve the use safety or manufacturing process of the battery pack.

[0004] It should be noted that the content introduced here is only to provide background information related to the present disclosure, and does not necessarily belong to the prior art. INVENTION CONTENT

[0005] According to different aspects, the purpose of the present application is to provide an improved battery monomer, a battery module, a battery pack and an electric device, wherein the battery monomer is beneficial to improve the operation safety, reliability and manufacturing process of the battery pack manufactured therefrom.

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

[0007] According to a first aspect of the present application, a battery monomer is provided, comprising:

[0008] a shell enclosing at least one opening, and the outer surface of the shell comprises a fixed surface and a non-fixed surface, the fixed surface being used to fix the battery monomer;

[0009] a cover plate fixed on the shell and used to close the opening;

[0010] wherein an insulating coating is provided on the fixed surface and an insulating film is coated on the non-fixed surface,

[0011] wherein a functional area for being exposed to the outside is further provided on the outer surface of the shell, the functional area being selected from the group comprising:

[0012] A contact area, located on the fixed surface and / or the non-fixed surface, through which the detection device can be connected to the outer surface of the housing;

[0013] A clamping area is located on the non-fixed surface, where the clamping device can clamp onto the outer surface of the housing;

[0014] The identification area is located on the non-fixed surface and has parameter identification of the battery cell thereon.

[0015] Optionally, in the battery cell proposed according to the first aspect, the non-fixed surface, except for the functional area, is entirely covered with the insulating film.

[0016] In the battery cell proposed according to the first aspect, optionally, an arcuate transition region is provided between the fixed surface and the adjacent non-fixed surface, wherein the insulating coating extends toward the non-fixed surface until it at least covers a portion of the arcuate transition region, or the insulating coating extends toward the non-fixed surface beyond the arcuate transition region until it partially overlaps with the insulating film.

[0017] In the battery cell proposed according to the first aspect, optionally, an arcuate transition region is provided between the fixed surface and the adjacent non-fixed surface, wherein the insulating film extends toward the fixed surface until it at least covers a portion of the arcuate transition region, or the insulating film extends toward the fixed surface beyond the arcuate transition region until it partially overlaps with the insulating coating.

[0018] In the battery cell proposed according to the first aspect, optionally, the cover plate is adjacent to the fixing surface and the insulating coating on the fixing surface extends toward the cover plate until it at least covers a portion of the cover plate;

[0019] And / or, the cover plate is adjacent to the non-fixed surface and the insulating film on the non-fixed surface extends toward the cover plate until it at least covers a portion of the cover plate.

[0020] Optionally, in the battery cell proposed according to the first aspect, the battery cell is square, and the outer surface of the casing includes a bottom surface and a side surface adjacent to the bottom surface, which together form an opening opposite to the bottom surface, and a cover plate is fixed at the opening, wherein the bottom surface is a fixed surface.

[0021] Optionally, in the battery cell proposed according to the first aspect, the battery cell is square, and the outer surface of the casing includes a bottom surface, a top surface opposite to it, and a side surface located between the bottom surface and the top surface, which together form two openings opposite to each other, and a cover plate is fixed to each of the openings, wherein at least one of the bottom surface and the top surface is a fixed surface.

[0022] In the battery cell proposed according to the first aspect, optionally, the bottom surface and the top surface serve as fixed surfaces, wherein one of the bottom surface and the top surface is provided with an insulating coating and the other is covered with an insulating film.

[0023] In the battery cell proposed according to the first aspect, optionally, the functional area is located on the side of the housing.

[0024] In the battery cell proposed according to the first aspect, optionally, the size specifications of the functional area and the spacing between its edge and the edge of the surface it occupies depend at least on the required anti-creep performance.

[0025] According to a second aspect of this application, a battery module is also proposed, which includes a plurality of the aforementioned battery cells arranged in a predetermined direction.

[0026] According to a third aspect of this application, a battery pack is also provided, which includes a housing, a cooling plate and a plurality of the aforementioned battery cells, wherein the battery cells are arranged along a predetermined direction and are fixed in the housing by their fixing surfaces on the cooling plate.

[0027] Finally, according to the fourth aspect of this application, an electrical device is also proposed, which may include the aforementioned battery cell, or may include the aforementioned battery module, or may include the aforementioned battery pack.

[0028] According to the battery cell disclosed herein, while ensuring its insulation and shear resistance under vibration or impact, the manufacturing process of the battery pack can be further improved by setting up corresponding functional areas. Attached Figure Description

[0029] Referring to the accompanying drawings, the above and other features of this application will become apparent, wherein,

[0030] Figure 1 A first embodiment of a battery cell according to this application is shown;

[0031] Figure 2 This shows the basis from another perspective. Figure 1 Battery cells;

[0032] Figure 3 A second embodiment of the battery cell according to this application is shown;

[0033] Figure 4 A third embodiment of the battery cell according to this application is shown;

[0034] Figure 5 This shows the basis from another perspective. Figure 4 Battery cells;

[0035] Figure 6 A fourth embodiment of the battery cell according to this application is shown;

[0036] Figure 7 This shows the basis from another perspective. Figure 6 Battery cells;

[0037] Figure 8 A fifth embodiment of a battery cell according to this application is shown;

[0038] Figure 9 It shows that according to Figure 8 The battery cells. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] It should be noted that the battery cell mentioned in this disclosure refers to a battery cell having an internal cell assembly, an external cover (or cover assembly), and an external 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 may be provided on the same cover, or the positive and negative electrode may be separately located on opposite sides (i.e., a blade battery, such as a short blade battery or a long blade battery). In a cylindrical battery cell, the sides of its casing are circumferential surfaces.

[0042] Next, it should be noted that the battery module or battery pack mentioned in this disclosure is a unit or assembly having a certain number of battery cells that are electrically connected to each other. 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.

[0043] Furthermore, it should be noted that 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.

[0044] First, referring to the accompanying drawings, the battery cell 100 has a housing 110, a cell assembly (not shown) housed therein, and a cover 120. The housing 110 may be made of aluminum or stainless steel and is filled with electrolyte. The outer surface of the housing includes a fixed surface and a non-fixed surface, wherein the fixed surface is used, for example, to fix the battery cell 100 in the housing of a battery pack, particularly to its cooling plate or its top cover, for example, by means of adhesive. Alternatively, in CTC technology, the fixed surface is used to fix the battery cell to the vehicle chassis. However, the non-fixed surface is not used to fix the battery cell; in, for example, in a CTM-based battery pack (where multiple battery cells are placed in the housing after being integrated into a module), the non-fixed surface may face adjacent battery cells, or it may face the side wall of the housing or the side wall of the module.

[0045] It should be understood here that the above-described fixing method of the fixed surface and the above-described posture of the non-fixed surface in the assembled state are merely exemplary and not restrictive. In addition, the terms "surface," "fixed surface," "non-fixed surface," and "bottom surface," "top surface," and "side surface," which will be mentioned below, refer to part of the housing of the battery cell and should not be construed as flat surfaces.

[0046] The battery cell assembly is mainly composed of positive and negative electrodes of opposite polarity, and optionally, insulating materials stacked or wound between them. The battery cell assembly can be inserted through an opening formed by a housing 110, which is closed by a cover plate 120 that can be welded to the housing 110. Two terminals 121 are provided on the cover plate 120, one being the positive terminal and the other the negative terminal. Furthermore, an explosion-proof valve 122 is also provided on the cover plate 120.

[0047] according to Figure 1 and Figure 2The image shows a first embodiment of the battery cell according to this application from different perspectives. It can be seen that the battery cell 100 is square, and the outer surface of its casing 110 includes a bottom surface 111 and side surfaces 112, which together form a unique opening opposite to the bottom surface 111. The opening is closed by a cover plate 120, which is circumferentially welded to the side surfaces 112, and a positive terminal and a negative terminal are simultaneously provided on the cover plate. The side surfaces 112 include two first side surfaces and two second side surfaces opposite to each other, wherein the first side surfaces are larger in area than the second side surfaces and may also be referred to as large surfaces. The bottom surface 111 is a fixed surface, while the side surfaces 112 (including the two first side surfaces and the two second side surfaces) are non-fixed surfaces. For example, the manufacturing process of the battery pack is as follows: a certain number of battery cells are stacked along a preset direction to form a module; the module is placed into a cavity limited by the crossbeams and longitudinal beams of the housing, wherein the bottom surface 111 of each battery cell is fixed to the cooling plate by adhesive; other accessories are installed to form the battery pack.

[0048] from Figure 1 and Figure 2 It can also be seen that an insulating coating 130 (schematically shown in green in the drawings for clarity) is provided on a portion of the bottom surface 111, which serves as the fixed surface. An insulating film 140 (schematically shown in blue in the drawings for clarity) covers the entire area of ​​the side surface 112, which serves as the non-fixed surface.

[0049] Alternatively, an insulating film 140 may be partially covered on the non-fixed surface, wherein the location and size of the area covered by the insulating film may depend on the required anti-creep performance and the arrangement of the battery cell with adjacent devices (box, adjacent battery cell or other electronic devices, etc.).

[0050] Here, the insulating coating 130 may involve, but is not limited to, common acrylic resins, epoxy resins, or polyurethane resins. The insulating coating 130 can be formed by applying insulating material to the fixed surface using spraying, inkjet printing, or 3D printing, and then curing, especially photocuring (e.g., ultraviolet light curing), wherein the thickness of the insulating coating can be 20 μm-250 μm. The insulating coating can be tightly bonded to the bottom surface 111.

[0051] Furthermore, the insulating film 140 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. The insulating film 140 may be adhered to the side 112.

[0052] Here, by combining a fixed surface coated with an insulating coating 130 and a non-fixed surface covered with an insulating film 140, wherein the insulating film is more cost-effective and the insulating coating is more suitable in terms of shear resistance and insulation, the problem of insulation peeling due to vibration or impact can be avoided, thereby improving the insulation of the battery cell 100 in a cost-effective manner.

[0053] from Figure 1 and Figure 2 It can also be seen that a functional area (schematically shown in gray in the drawings) is provided on the bottom surface 111 of the housing 110, which serves as the fixed surface. In this functional area, the outer surface of the housing 110 is exposed, or in other words, accessible. Specifically, this functional area is a contact area 150, through which a detection device can be directly connected to the outer surface of the housing 110. Exemplarily, the contact area 150 can be formed by pre-reserving a metal exposed area on the bottom surface 111. The detection device may be, but is not limited to: an insulation detection device (for example, for performing insulation testing after applying an insulating coating and covering an insulating film and before being placed into the housing), a voltage detection device (for example, for detecting the voltage between the housing and the negative terminal before the battery cell is placed into the housing), and a temperature detection device (for example, for measuring the temperature of the battery cell's housing). The contact area 150 enables quality monitoring of the battery cells, which helps improve the operational safety of the battery pack composed of them. Furthermore, at the contact area 150, the outer surface of the casing 110 of the battery cell 100 is in direct contact with the adhesive that plays a fixing role, which also helps to improve the fixing strength of the battery cell.

[0054] from Figure 2 It can also be seen that the contact area 150 is located in the middle of the bottom surface 111, which serves as the fixed surface, and is surrounded by an insulating coating 130 and an insulating film 140. In this way, while providing the aforementioned quality monitoring capabilities, the risk of lateral creepage is also reduced. Here, the size and position of the contact area 150 on the bottom surface 111 are related to both the required creepage resistance and the structure of the detection device (specifically, its probe or probe). That is, the contact area 150 is designed according to the required creepage resistance and the effective contact area with the probe or probe. In a specific embodiment, the contact area 150 is located in the middle of the fixed surface and is square, the length and width of which are in the range of 3mm-10mm, and the distance between the upper and lower edges of the square and the upper and lower edges of the bottom surface 111 is at least 0.3mm, that is, an insulating film at least 0.3mm wide surrounds the contact area above and below.

[0055] from Figure 2It can also be seen that there is an arc-shaped transition area between the bottom surface 111 and the side surface 112, and an arc-shaped transition area is also provided between the first side surface and the second side surface. The insulating film 140 covers the entire side surface 112 and extends towards the bottom surface 111 beyond the arc-shaped transition area until it covers a portion of the insulating coating 130 located on the bottom surface 111. In a specific embodiment, combined with Figure 2 The insulating film 140 extends at least 0.3 mm beyond the arc transition area, that is, the insulating film 140 on the bottom surface 111 is annular and at least 0.3 mm wide.

[0056] In an embodiment not shown, it is also possible for the insulating film 140 to extend toward the bottom surface 111 and cover only a portion of the aforementioned arcuate transition region, wherein the insulating film 140 may overlap or partially overlap with the insulating coating 130, which also extends toward the adjacent side surface 112, at the arcuate transition region.

[0057] In another embodiment not shown, it is also possible for the insulating coating 130 to extend toward the adjacent side 112 across the aforementioned arcuate transition region and overlap or partially overlap with the insulating film 140 on the side 112.

[0058] It should be understood that the above arrangement of the insulating coating 130 on the fixed surface and the insulating film 140 on the non-fixed surface is merely exemplary and not restrictive, and can be modified accordingly as needed.

[0059] In addition, from Figure 1 It can also be seen that, in the first embodiment, the side 112, which is a non-fixed surface, extends toward the adjacent cover plate 120 and covers a portion of the cover plate 120. In a specific embodiment, the portion of the insulating film 140 on the cover plate 120 is annular and its width is at least 0.3 mm. Of course, it is also possible for the insulating film 140 on the side 112, which is a non-fixed surface, to extend to the cover plate 120 and cover the area except for the positive and negative terminals, explosion-proof valves, or other devices.

[0060] according to Figure 3 This illustrates a second embodiment of the battery cell 100 according to this application, wherein a strip-shaped contact area 150 is provided in the middle of the bottom surface 111, through which a detection device can be connected to the outer surface of the housing 110. However, unlike the first embodiment described above, the contact area is externally surrounded only by an insulating coating 130 and has a smaller size to match the probe or sensor of the detection device.

[0061] according to Figure 4 and Figure 5This illustration shows a third embodiment of the battery cell according to this application from different perspectives, wherein the bottom surface 111 is a fixing surface for fixing the battery cell 100, while the side surface 112 (including two opposing first side surfaces and two opposing second side surfaces) is a non-fixing surface. The entire area of ​​the bottom surface 111 is coated with an insulating coating 130, which can be fixed to a cooling plate by an adhesive. An insulating element may be provided on the side of the cooling plate facing the battery cell. An insulating film 140 on the side surface 112 extends onto the bottom surface 111 and partially overlaps with the insulating coating 130 thereon. A contact area 150 is provided on the second side surface of the side surface 112, which is arranged closer to the cover plate 120 and surrounded by the insulating film 140.

[0062] Here, the contact area 150, located on a non-fixed surface, allows for inspection of individual battery cells (either individually or as battery modules) before and after placement into the housing, which is obviously beneficial for quality control of the battery pack. Furthermore, since electronic components (e.g., circuit boards) are typically located above the cover plate 120, the arrangement of the contact area 150 closer to the cover plate 120 facilitates wiring. It should be understood that the arrangement of the contact area 150 on the side, which is a non-fixed surface, is merely exemplary and not limiting, and can be modified as needed.

[0063] according to Figure 6 and Figure 7 The illustration shows a fourth embodiment of the battery cell according to this application from different perspectives, wherein the bottom surface 111 is a fixing surface for fixing the battery cell 100, while the side surface 112 (including two first side surfaces and two second side surfaces opposite each other) is a non-fixing surface. An insulating film 140 on the side surface 112 extends onto the bottom surface 111 and overlaps with the insulating coating 130 thereon, thus providing insulation over the entire area of ​​the bottom surface 111. A clamping area 160 (schematically shown in gray in the drawings for clarity) is provided on the larger first side surface (i.e., the so-called large surface) of the side surface 112, wherein the clamping device can securely clamp directly or indirectly onto the outer surface of the housing 110 during battery cell transfer via the clamping area. The clamping area prevents wrinkling of the insulating film 140 during battery cell transfer.

[0064] The clamping area 160 can be formed by pre-reserving an exposed metal area on the first side surface, or it can be formed by laser etching the insulating film 140 covering the first side surface. The dimensions and position of the clamping area 160 on the first side surface (e.g., the distance between the edge of the clamping area and the edge of the first side surface) depend on the required anti-creep performance and the structure of the clamping device, wherein the anti-creep performance is inversely proportional to the clamping performance and is matched to the clamping shape of the clamping device. In a specific embodiment, the clamping area 160 is located in the middle of the first side surface and its dimensions are at least 30mm*30mm. It should be understood that the arrangement of the clamping area 160 on the side surface 112, which is a non-fixed surface, is merely exemplary and not limiting, and can be modified accordingly as needed.

[0065] Furthermore, analogous to Figure 7 A marking area (not shown) may be provided on the first side surface 112, which is a non-fixed surface. This marking area contains parameter markings for the battery cell, which can be achieved through inkjet printing or laser etching. The parameter markings may relate to the battery cell's type, specifications, manufacturing information, or other traceable information. For example, the parameter markings can be implemented as a QR code. Similarly, the size and position of the marking area on the first side surface depend at least on the required anti-creep performance. In one specific embodiment, the marking area is located in a corner region of the first side surface and has a size of approximately 10mm x 10mm.

[0066] according to Figure 8 and Figure 9 This illustration shows a fifth embodiment of the battery cell according to this application from different perspectives. The battery cell 100 is square, and the outer surface of its housing 110 includes a bottom surface 111, a side surface 112, and a top surface 113. The side surface 112 is located between the bottom surface 111 and the top surface 113 and includes the two first side surfaces that are opposite each other. Here, the bottom surface 111 and the top surface 113 are fixed surfaces; the two first side surfaces are non-fixed surfaces; and two cover plates 120 are opposite each other and adjacent to both the fixed surfaces and the non-fixed surfaces. This battery cell may also be referred to as a blade battery, such as a so-called short blade battery or long blade battery.

[0067] from Figure 8 and Figure 9It can also be seen that the bottom surface 111, which serves as the fixing surface, is entirely coated with an insulating coating 130, while the top surface 113, which also serves as the fixing surface, is covered with an insulating film 140 and has the aforementioned contact area 150. Exemplarily, the insulating film on the top surface 113 and the insulating film on the side surface 112 are integral to facilitate covering. The dimensions of the contact area 150 and its position on the top surface 113 also depend on the structure of the detection device and the required anti-creep performance.

[0068] It should be understood that an insulating coating may be applied to both the bottom surface 111 and the top surface 113, or an insulating film may be applied to the bottom surface 111 and an insulating coating may be applied to the top surface 113.

[0069] In addition, it is also feasible to have only the bottom surface or only the top surface be a fixed surface in the aforementioned blade battery.

[0070] Regarding the modified solution for the fifth embodiment, it is also feasible to: the contact area is located on the bottom surface or on the first side surface; and / or, a clamping area is also provided on the first side surface; and / or, an marking area is also provided on the first side surface, wherein the clamping area and the marking area can be referred to the description above.

[0071] In addition, from Figure 8 and Figure 9 It can also be seen that the insulating film 140 extends toward the cover plate 120 and covers the arcuate transition area between the top surface 113 or the side surface 112 and the cover plate 120. Alternatively, the insulating film 140 on the top surface 113 and the side surface 112 extends toward the cover plate and covers at least a portion of the cover plate 120 outside the pole post 121 and the explosion-proof valve 122. It is also possible that the insulating coating 130 on the bottom surface 111 extends toward the cover plate 120 and covers at least a portion of the arcuate transition area therebetween. It is also possible that the insulating coating 130 on the bottom surface 111 extends toward the cover plate 120 and covers at least a portion of the cover plate 120 outside the pole post 121 and the explosion-proof valve 122. It should be understood that the above-described arrangements of the insulating coating or insulating film with respect to the cover plate are merely exemplary and not limiting, and modifications can be made as needed.

[0072] In summary, the battery cell according to this application has at least the following advantages:

[0073] 1. By coating the fixed surface with an insulating coating and covering the non-fixed surface with an insulating film, the insulation of the battery cell can be guaranteed and its shear resistance can be improved when subjected to vibration or impact.

[0074] 2. By setting contact areas for the detection device on fixed surfaces, especially on non-fixed surfaces, the quality of individual battery cells can be monitored, thereby improving the operational safety of the battery pack;

[0075] 3. By setting a clamping area on the non-fixed surface, wrinkles in the insulating film can be avoided during the transfer of battery cells, thereby ensuring the desired thickness of the battery cells;

[0076] 4. By setting up a marking area on a non-fixed surface, it is convenient to sort individual battery cells, verify manufacturing-related information, and trace information during subsequent failure analysis;

[0077] 5. The insulation of the battery cells can be further improved by extending the insulating film or insulating coating to the cover plate.

[0078] According to a second aspect of this application, a battery module is also proposed, comprising a plurality of battery cells according to at least one of the embodiments described above, the plurality of battery cells being arranged and stacked along a predetermined direction and electrically connected to each other. Exemplarily, in the stacked state, adjacent battery cells face each other with their first side surface (i.e., large surface). The battery module can then be placed into a housing to form a battery pack.

[0079] In particular, the advantages and features described in relation to the battery module according to this application are evident in the battery cell according to this application, with reference to the description made for the battery cell according to this application.

[0080] Furthermore, according to a third aspect of this application, a battery pack is also proposed, comprising a housing, a cooling plate, and a plurality of battery cells according to at least one of the embodiments described above. The plurality of battery cells are arranged and stacked along a predetermined direction and electrically connected to each other. The plurality of battery cells can be assembled into a battery pack using CTM technology, CTP technology, or CTC technology. This battery pack can be a high-voltage battery pack, for example, used as a power battery in new energy vehicles, or it can be a low-voltage battery pack, for example, used in new energy vehicles to provide power for corresponding functions during vehicle hibernation. In addition, 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 that forms at least one opening, and the outer surface of the housing includes a fixed surface and a non-fixed surface, the fixed surface being used to fix the battery cell; A cover plate, which is fixed to the housing and serves to close the opening; Its characteristic is that an insulating coating is provided on the fixed surface and an insulating film is covered on the non-fixed surface. The outer surface of the housing also includes a functional area for exposing it to the outside, the functional area being selected from the group consisting of: A contact area, located on the fixed surface and / or the non-fixed surface, through which the detection device can be connected to the outer surface of the housing; A clamping area is located on the non-fixed surface, where the clamping device can clamp onto the outer surface of the housing; The identification area is located on the non-fixed surface and has parameter identification of the battery cell thereon.

2. The battery cell according to claim 1, characterized in that, The non-fixed surface, except for the functional area, is entirely covered with the insulating film.

3. The battery cell according to claim 2, characterized in that, An arc-shaped transition region is provided between the fixed surface and the adjacent non-fixed surface, wherein the insulating coating extends toward the non-fixed surface until it at least covers a portion of the arc-shaped transition region, or the insulating coating extends toward the non-fixed surface beyond the arc-shaped transition region until it partially overlaps with the insulating film.

4. The battery cell according to claim 2, characterized in that, An arc-shaped transition region is provided between the fixed surface and the adjacent non-fixed surface, wherein the insulating film extends toward the fixed surface until it at least covers a portion of the arc-shaped transition region, or the insulating film extends toward the fixed surface beyond the arc-shaped transition region until it partially overlaps with the insulating coating.

5. The battery cell according to claim 1, characterized in that, The cover plate is adjacent to the fixing surface and the insulating coating on the fixing surface extends toward the cover plate until it at least covers a portion of the cover plate; And / or, the cover plate is adjacent to the non-fixed surface and the insulating film on the non-fixed surface extends toward the cover plate until it at least covers a portion of the cover plate.

6. The battery cell according to claim 1, characterized in that, The battery cell is square, and the outer surface of the casing includes a bottom surface and a side surface adjacent to the bottom surface, which together form an opening opposite to the bottom surface. A cover plate is fixed at the opening, wherein the bottom surface is a fixed surface.

7. The battery cell according to claim 1, characterized in that, The battery cell is square, and the outer surface of the casing includes a bottom surface, a top surface opposite to it, and a side surface located between the bottom surface and the top surface, which together form two openings opposite to each other. A cover plate is fixed to each of the openings, wherein at least one of the bottom surface and the top surface is a fixed surface.

8. The battery cell according to claim 7, characterized in that, The bottom surface and the top surface both serve as fixed surfaces, wherein one of the bottom surface and the top surface is provided with an insulating coating and the other is covered with an insulating film.

9. The battery cell according to claim 6 or 7, characterized in that, The functional area is located on the side of the housing.

10. The battery cell according to claim 1, characterized in that, The dimensions of the functional area and the spacing between its edge and the edge of the surface it occupies depend at least on the required anti-creep performance.

11. A battery module, characterized in that, It includes a plurality of battery cells according to any one of claims 1 to 10, wherein the plurality of battery cells are arranged along a predetermined direction.

12. A battery pack, characterized in that, It includes a housing, a cooling plate, and a plurality of battery cells according to any one of claims 1 to 10, wherein the battery cells are arranged in a predetermined direction and are fixed in the housing by their fixing surfaces on the cooling plate.

13. An electrical appliance, characterized in that, It includes a battery cell according to any one of claims 1 to 10, or a battery module according to claim 11, or a battery pack according to claim 12.

Images