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, the single battery comprises a shell and a battery core assembly accommodated in the shell, the shell comprises a first wall, the outer surface of the first wall comprises a fixing area, the fixing area is used for being fixed with a pressing strip, and the first wall is provided with a second wall; and the second wall is opposite to the first wall along the thickness direction of the first wall and is used for being supported in the box body, the fixing area is covered with a first insulating part, and the first insulating part is an insulating coating or insulating glue comprising a base material layer and a UV glue layer which are laminated with each other. According to the battery single body, the situation that the battery single body shakes in the battery pack due to the impact working condition can be avoided, and the operation safety and reliability of the battery pack are improved.

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, 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 devices. 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 a box.

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

[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 can be 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 a shell and a cell assembly contained in the shell, the shell comprising:

[0008] a first wall, the outer surface of which comprises a fixing area for fixing with a pressing strip; and

[0009] a second wall, which is opposite to the first wall along the thickness direction of the first wall and is used to be supported in a box,

[0010] wherein a first insulating piece is covered on the fixing area, the first insulating piece being an insulating coating or an insulating glue comprising a substrate layer and a UV glue layer stacked with each other.

[0011] In the battery cell according to the first aspect of the present application, the insulating adhesive is single-sided adhesive, wherein the UV adhesive layer is adhered to the outer surface of the first wall at the fixed area, and the substrate layer is used to adhere to the compression strip.

[0012] In the battery cell according to the first aspect of the present application, the insulating adhesive is double-sided adhesive and sequentially comprises a first UV adhesive layer, a substrate layer and a second UV adhesive layer which are laminated with each other, wherein the first UV adhesive layer is adhered to the outer surface of the first wall at the fixed area, and the second UV adhesive layer is used to adhere to the compression strip.

[0013] In the battery cell according to the first aspect of the present application, the adhesion strength between the insulating adhesive and the outer surface of the first wall is at least greater than the adhesion strength between the insulating adhesive and the compression strip.

[0014] In the battery cell according to the first aspect of the present application, the thickness of the insulating adhesive is between 0.02mm and 0.5mm.

[0015] In the battery cell according to the first aspect of the present application, a second insulating member is covered on the second wall, and the second insulating member is an insulating coating layer.

[0016] In the battery cell according to the first aspect of the present application, the second insulating member on the second wall is provided with a hollow area, at which the outer surface of the second wall is directly adhered and supported in the box.

[0017] In the battery cell according to the first aspect of the present application, the battery cell is square-shaped, and the shell further comprises a third wall which is connected with the first wall and the second wall respectively and jointly limits a cavity for accommodating the cell assembly, and the third wall comprises four wall portions which are connected in sequence.

[0018] In the battery cell according to the first aspect of the present application, the first wall is provided with a positive pole and a negative pole which are electrically connected with the cell assembly respectively, and a third insulating member is covered on the third wall, and the third insulating member extends from the third wall towards the first wall connected therewith until covering a part of the outer surface of the first wall.

[0019] In the battery cell according to the first aspect of the present application, the first insulating member is arranged in the edge area of the first wall adjacent to the third wall and has an overlapping area with the third insulating member on the first wall.

[0020] In the battery cell according to the first aspect of the present application, a fourth insulating member is further arranged on the first wall, wherein the edge of the fourth insulating member and the edge of the third insulating member on the first wall jointly limit the fixing area, or a hollow area corresponding to the fixing area in the thickness direction of the first wall is arranged on the fourth insulating member.

[0021] In the battery cell according to the first aspect of the present application, the fourth insulating member is an insulating sheet.

[0022] In the battery cell according to the first aspect of the present application, the third insulating member is an insulating film.

[0023] In the battery cell according to the first aspect of the present application, the first wall is further used for supporting in the box, and the outer surface of the second wall further comprises the fixing area used for fixing with the pressing strip and covered with the first insulating member on the fixing area.

[0024] In the battery cell according to the first aspect of the present application, the positive electrode pole and the negative electrode pole respectively corresponding to the electric cell assembly are arranged on the two wall parts of the third wall opposite to each other.

[0025] In the battery cell according to the first aspect of the present application, a hollow area is arranged on the wall part of the four wall parts of the third wall without the positive electrode pole and the negative electrode pole, and the hollow area is a functional area selected from the following group:

[0026] a contact area through which a detection device can be connected to the outer surface of the shell;

[0027] a clamping area at which a clamping device can be clamped on the outer surface of the shell; and

[0028] an identification area on which a parameter identification of the battery cell is arranged.

[0029] In addition, according to the second aspect of the present application, a battery module is further provided, which comprises a plurality of the above-mentioned battery cells arranged along a predetermined direction and fixed relative to each other by means of a pressing strip, wherein the pressing strip is fixed on the first insulating member at the fixing area of the battery cell.

[0030] In addition, according to the third aspect of the present application, a battery pack is further provided, which comprises a box and a plurality of the above-mentioned battery cells arranged along a predetermined direction and supported in the box by means of the second wall of each battery cell, and the plurality of battery cells are further fixed relative to each other by means of a pressing strip, wherein the pressing strip is fixed on the first insulating member at the fixing area of the battery cell.

[0031] Finally, according to a fourth aspect of the present application, there is also provided a power utilization device comprising the above-mentioned battery cell, or comprising the above-mentioned battery module, or comprising the above-mentioned battery pack.

[0032] According to the battery cell of the present application, the battery cell in the battery pack can be prevented from shaking due to impact working conditions, and the operation safety and reliability of the battery pack are improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and other features of the present application will become more apparent by describing in detail the embodiments thereof with reference to the attached drawings in which,

[0034] Figure 1 An embodiment of the battery cell according to the present application is shown;

[0035] Figure 2 A battery cell according to the present application is shown, which has a first insulation member and a third insulation member; Figure 1

[0036] A battery cell according to the present application is shown, which has a first insulation member and a third insulation member; Figure 3 Figure 2 A battery cell according to the present application is shown, which has a first insulation member and a third insulation member;

[0037] Figure 4 Figure 3 The arrangement of the fixing area of the battery cell according to the present application is shown in an enlarged view;

[0038] Figure 5 A modified arrangement of the fixing area of the battery cell according to the present application is shown in an enlarged view;

[0039] Figure 6 An embodiment of the battery cell according to the present application is shown;

[0040] Figure 7 An embodiment of the battery cell according to the present application is shown;

[0041] Figure 8 An embodiment of the battery cell according to the present application is shown;

[0042] Figure 9 An embodiment of the battery cell according to the present application is shown;

[0043] Figure 10 An embodiment of the battery cell according to the present application is shown;

[0044] Figure 11 An embodiment of the battery cell according to the present application is shown;

[0045] Figure 12 An embodiment of the battery cell according to the present application is shown; ​​

[0046] Figure 13 An embodiment of a battery cell according to the present application is shown;

[0047] Figure 14 An embodiment of a battery module according to the present application is shown;

[0048] Figure 15 An embodiment of a battery module according to the present application is shown. DETAILED DESCRIPTION

[0049] It is readily understood that the technical solution according to the present application can have various structural modes and implementation modes which can be replaced with each other without changing the spirit of the present application, which can be proposed by those skilled in the art. Therefore, the following detailed description and the accompanying drawings are only exemplary description of the technical solution of the present application, and should not be regarded as the whole or as the limitation or restriction of the technical solution of the present application.

[0050] In the present specification, the orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the configuration shown in the drawings, which are relative concepts, and thus can be changed accordingly depending on different positions and different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third" or the like or similar expressions are only used for description and differentiation purposes, and cannot be understood as indicating or implying the relative importance of the corresponding members.

[0051] It should be noted that the battery cell mentioned in the present disclosure is of a structure comprising an external casing and an internal cell assembly contained in the casing. The battery cell can be, but is not limited to, a lithium ion battery cell, such as a lithium ion primary battery or a lithium ion secondary battery. In addition, the battery cell can be, but is not limited to, a square battery cell or a cylindrical battery cell. Specifically, in the square battery cell, the positive and negative pole posts are provided on the same side or the same wall of the battery cell, i.e. they are arranged adjacently. Alternatively, in the square battery, the positive and negative pole posts are provided separately on two sides or two walls opposite to each other, 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 of the casing is a circumferential surface.

[0052] In addition, the casing of the battery cell is a component comprising various parts which together form a closed chamber for containing the cell assembly. Specifically, the first wall, the second wall and the third wall mentioned herein together enclose a closed chamber.

[0053] It should also be noted that the battery module or battery pack mentioned in the present disclosure is a unit or assembly having a certain number of battery cells 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.

[0054] In addition, it should also be noted that the power consuming device mentioned in the present disclosure refers to a device having an energy storage device and an electric consumer that needs to be supplied with electric energy by the energy storage device. The power consuming device can be, but is not limited to, a new energy vehicle, including a pure electric vehicle and a hybrid electric vehicle.

[0055] Generally, a pressing strip is provided in the battery pack for fixing and integrating a plurality of battery cells stacked with each other relative to each other. The pressing strip can be directly bonded to the outer surface of the shell of the battery cell, which can be disadvantageous for the insulation protection between adjacent battery cells. Alternatively, the pressing strip can be bonded to the insulation member covering the outer surface, and the corresponding bonding connection can fail when the battery cell is subjected to a vibration impact, which can cause the battery cell to shake in the box.

[0056] Based on this, an improved battery cell is proposed in the present application, which can improve the overall structural strength of a group of a plurality of battery cells stacked together, and the corresponding battery cell can be stably maintained in the box when the battery pack is subjected to a vibration impact, which is advantageous for the operation reliability and safety of the battery pack. Here, the concept of "group" should not be limitedly understood, which is a combination of a plurality of battery cells, specifically, the group can be a battery module applied in the CTM technology, while in the CTP technology or the CTC technology, the group can only be understood as a combination of a plurality of battery cells.

[0057] According to Figure 1 , an embodiment of a battery cell according to the present application is shown, which is a square battery including a shell and an electrode assembly (not shown) contained therein. The internal electrode assembly is mainly stacked or wound by positive and negative electrode plates with opposite polarities and optionally an insulation member therebetween. The shell can be made of aluminum and filled with electrolyte therein.

[0058] Specifically, the shell of the battery cell includes a first wall 110, a second wall 120 (which is not visible in Figure 1 , see Figures 8 to 13 ) and a third wall 130, wherein the second wall 120 is along the thickness direction (i.e. the Z direction, which is not visible in Figure 1The third wall 130 includes four wall portions that are contiguous with each other in the circumferential direction, and the third wall 130 is contiguous with the first wall 110 and the second wall 120 at both ends in the Z direction, respectively. The first wall 110, the second wall 120, and the third wall 130 collectively define a chamber in which the battery cell assembly is housed and enclosed.

[0059] In Figure 1 the two pole posts 111 (one of which is a positive pole post and the other of which is a negative pole post) that are electrically connected to the battery cell assembly inside are provided on the first wall 110. The first wall 110 can also be referred to as a cover plate, which is configured separately from the third wall 130. For example, the battery cell assembly can be placed into the space defined by the second wall 120 and the third wall 130 from the side on which the cover plate is provided, and then the battery cell assembly is enclosed in the space by connecting the cover plate to the third wall 130, for example, by welding.

[0060] Furthermore, it is also possible for the two pole posts 111 to be provided opposite each other. For example, the two pole posts can be provided on two wall portions of the third wall 130 that are opposite each other, for example, as shown in Figure 13 In this case, the wall portion on which the pole posts are provided can also be referred to as the cover plate.

[0061] In the battery cell according to the application, the second wall 120 is used to be fixed and supported in the case, and the second wall can be referred to as a fixing wall, i.e., for fixing the battery cell as a whole in the case. The first wall 110 is a wall of the housing of the battery cell that is opposite the fixing wall in the thickness direction of the fixing wall, i.e., in the Z direction mentioned above, and the outer surface of the first wall can be provided with or can not be provided with the corresponding components of the battery cell (such as pole posts, explosion-proof valves, or other devices), and the embodiments of the application do not limit this. The "outer surface" of the housing or its component mentioned herein refers to the surface that faces away from the battery cell assembly inside.

[0062] According to Figures 1 to 7 , the outer surface of the first wall 110 of the housing of the battery cell includes a fixing region 113 (which is represented by a dashed line) for being fixed with the pressing strip 200 (see Figure 14 and Figure 15 ). When a plurality of battery cells are integrated into a group, the pressing strip 200 is fixed on the fixing region 113. The battery cells 100 in the same group are fixed relative to each other by the pressing strip 200 to improve the overall structural strength. In addition, the second wall 120 of the housing of the battery cell, which is opposite the first wall 110, is used to be supported in the case, i.e., supported in the case by being fixed to a component of the case.

[0063] Here, by fixing the battery cells integrated into a group on two opposite sides, relative fixation between adjacent battery cells is achieved on one side (i.e. the first wall 110), and fixation of each battery cell relative to the box is achieved on the other side (i.e. the second wall 120), thereby achieving the desired structural strength.

[0064] According to the present application, a first insulating member 114 is provided on the fixing area 113 of the first wall 110, which is used to fix the pressing strip 200. In one embodiment, the first insulating member 114 is an insulating coating (see Figure 5 ), which can involve but is not limited to acrylic resin, epoxy resin or polyurethane resin. The insulating coating can be formed by coating the insulating material on the fixing surface by spraying, inkjet printing or 3D printing, and curing, especially photocuring (such as ultraviolet photocuring), wherein the thickness of the insulating coating can be 20-250 μm. The insulating coating as the first insulating member 114 has improved shear resistance, tensile strength and insulation, which can be more closely combined on the outer surface of the first wall 110, avoiding the shaking of the battery cells, thereby ensuring the operation safety and reliability of the battery pack.

[0065] In another embodiment, the first insulating member 114 is an insulating adhesive, which includes a substrate layer and a UV adhesive layer stacked with each other, wherein the UV adhesive layer is bonded on the outer surface of the housing at the fixing area 113. The substrate layer can involve but is not limited to PET (polyethylene terephthalate) film, PI (polyimide) film, PP (polypropylene) film, PVC (polyvinyl chloride) film, PE (polyethylene) film, PC (polycarbonate) film. Exemplarily, the components of the UV adhesive layer can include epoxy resin, photoinitiator and optionally dye, which after being coated on the above-mentioned substrate layer form the UV adhesive layer in the form of UV light activation or UV light curing or any other feasible way.

[0066] The outer surface of the first wall 110 of the battery cell is bonded with the UV adhesive layer, which has a shear strength of at least 7 MPa, which can effectively avoid the shaking of the battery cell when subjected to vibration impact, thereby ensuring the operation safety and reliability of the battery pack. For the manufacturing process of the battery cell, the insulating adhesive can share the related equipment with the commonly used insulating film, with less modification to the original production line, which significantly reduces the cost investment of the manufacturing equipment. In addition, by the insulating adhesive, the amount of adhesive used for bonding the pressing strip can be correspondingly reduced, which is beneficial to the weight reduction of the battery pack.

[0067] In one embodiment, the insulating glue as the first insulating member 114 is single-sided adhesive, which comprises only a substrate layer and only a UV glue layer. The UV glue layer is adhered to the outer surface of the first wall 110 at the fixing area 113, and the substrate layer is adhered to the compression strip 200, for example, by additional glue.

[0068] In another embodiment, the insulating glue as the first insulating member 114 is double-sided adhesive, which comprises a first UV glue layer, a substrate layer and a second UV glue layer in sequence and stacked with each other. The first UV glue layer is adhered to the outer surface of the first wall 110 at the fixing area 113, and the second UV glue layer is adhered to the compression strip 200. In the case of the double-sided adhesive insulating glue, it can be fixed to the battery monomer 100 and the compression strip 200 respectively by its own adhesion, which eliminates the additional glue and the gluing process, and simplifies the manufacturing process of the battery pack. Here, it should be understood that the above-mentioned embodiments of the insulating glue are only exemplary and not limiting, and can be modified accordingly.

[0069] It is also possible that the adhesion strength between the insulating glue as the first insulating member 114 and the outer surface of the first wall 110 is greater than or equal to the adhesion strength between the insulating glue and the compression strip 200. Then, even if the compression strip 200 is peeled off from the insulating glue due to vibration impact, the insulating glue can still be adhered to the fixing area 113 of the first wall 110 on the other side, thereby effectively ensuring the insulation of the battery monomer and the operation safety and reliability of the battery pack.

[0070] The thickness of the insulating glue as the first insulating member 114 can be in the range of 0.02mm to 0.5mm, especially in the range of 0.1mm to 0.15mm. Here, it should be understood that the thickness of the insulating glue is only exemplary and not limiting, and can be selected to match other devices on the first wall or the insulating member on other parts of the shell.

[0071] Returning to Figure 2 , the fixing area 113 is located at the edge area of the first wall 110, the third insulating member 131 covering the third wall 130 extends onto the first wall 110 and has an overlapping area with the first insulating member 114 on the fixing area 113. Specifically, the third insulating member 131 extends beyond the arc-shaped transition area between the first wall 110 and the third wall 130 to the fixing area 113. In the overlapping area, the third insulating member 131 covers the insulating glue, or vice versa. Here, the third insulating member is an insulating film, which is more cost-effective and easier to implement. By covering the insulating film on the third wall 130 which requires lower shear strength and tensile strength, both the manufacturing cost and the required insulation performance can be considered.

[0072] For example, the insulating film as the third insulating element 131 may involve, 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 20μm-200μm.

[0073] according to Figure 3 and Figure 4 ,in, Figure 4 A schematic enlarged diagram is shown in Figure 3 In the arrangement of the fixing area of ​​the first wall in the battery cell, a fourth insulating member 115 is provided on the outer surface of the first wall 110 of the battery cell casing. This fourth insulating member 115 covers the area of ​​the first wall 110 except for the terminal post 111, the explosion-proof valve 112, and the marking area 116. The edge of the fourth insulating member 115 and the edge of the third insulating member 131 extending onto the first wall 110 together restrict the fixing area 113, or in other words, they together restrict the area where the first insulating member 114, used for fixing to the pressure strip 200, is located. The fourth insulating member 115 may also have an overlapping area with the first insulating member 114 to ensure reliable insulation.

[0074] Here, the fourth insulating element 115 is an insulating sheet, which is fixed, in particular, adhered to the first wall 110. 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 mold and still has good insulation, flame retardant, and wear resistance in high and low temperature environments.

[0075] In an embodiment not shown, it is also possible that the fourth insulating element 115 is an insulating coating, which can be applied to the first wall 110 together with the first insulating element 114, which is implemented as an insulating coating, by spraying, inkjet printing or 3D printing and then cured, especially photocured (e.g., ultraviolet light curing).

[0076] In another embodiment, not shown, it is also possible that the fourth insulating element 115 is an insulating film, which may be integral with the insulating film on the third wall 130.

[0077] according to Figure 6 and Figure 7 It shows about Figure 3The fourth insulating member 115 is an insulating sheet adhered to the outer surface of the first wall 110 and covers the area other than the two pole posts 111, the explosion-proof valve 112 and the identification area 116. A hollowed-out area is formed in the fourth insulating sheet 115, which corresponds to the fixing area 113 or the first insulating member 114 in the thickness direction (i.e., the Z direction) of the first wall 110, in other words, the hollowed-out area and the fixing area occupy substantially the same area. Exemplarily, the hollowed-out area and the fixing area are completely coincident in the Z direction, and the first insulating member 114 covers the hollowed-out area. Alternatively, the hollowed-out area is slightly smaller than the fixing area, i.e., the fourth insulating member 115 has a partially overlapping area with the first insulating member 114, as shown in Figure 6 and Figure 7 The fourth insulating sheet 115 overlaps the edge area of the first insulating member 114.

[0078] It can also be seen from Figure 6 that two first insulating members 114 are respectively located at the two ends of the first wall 110. In addition, it can also be seen from Figure 7 that one first insulating member 114 is located at the end of the first wall 110, and the other first insulating member 114 is located in the middle area of the first wall 110. Here, it should be noted that the above-mentioned embodiments of the number and position of the fixing area and the first insulating member on the first wall are exemplary and not mandatory, and can be modified as needed. For example, only one, three or more fixing areas and first insulating members can be provided.

[0079] Next, the second wall 120 and the third wall 130 of the battery cell according to the present application are described in detail. Figures 8 to 13

[0080] According to Figure 8 , the second wall 120 of the battery cell housing is entirely covered with a second insulating member 121, which is an insulating coating, and reference is made to the above description. An arc-shaped transition area is provided between the second wall 120 and the third wall 130, and the insulating film as the third insulating member 131 extends beyond the arc-shaped transition area towards the second wall 120 until covering a portion of the insulating coating on the second wall 120. Exemplarily, in a specific embodiment, the insulating film exceeds the arc-shaped transition area by at least 0.3 mm, i.e., the third insulating member 131 on the second wall 120 is in the shape of a rectangular ring and is at least 0.3 mm wide.

[0081] In accordance with Figure 9 ​In this embodiment, a perforated area 122 is provided on the second wall 120, where the outer surface of the second wall 120 of the battery cell housing is exposed. The perforated area 122 is confined by a third insulating member 131 extending to the second wall 120. During the manufacturing process of the battery pack, the perforated area 122 is in direct contact with the colloid, which also helps to improve the fixation strength of the battery cell in the housing. Furthermore, by means of the perforated area 122, the quality monitoring of the battery cell can be achieved by directly connecting the corresponding detection device to the outer surface of the first wall 120 before the battery cell is placed into the housing, wherein the perforated area is functionally analogous to the contact area mentioned below. The detection device may include, but is not limited to: insulation detection device, voltage detection device (for example, for measuring the voltage between the housing and the negative terminal), and temperature detection device (for example, for measuring the temperature of the battery cell housing).

[0082] according to Figure 10 It shows about Figure 9 A modified version of the hollow area 122 is provided, wherein the hollow area 122 is located in the middle of the second wall 120 and is strip-shaped. The hollow area 122 is limited only by the second insulating member 121, which is an insulating coating, and has a small size to match the probe or sensor of the detection device.

[0083] It should be noted that the size and location of the cutout area 122 on the second wall 120 may be modified depending on the required anti-creep performance and the structure of the above-mentioned detection device (specifically its probe or probe probe).

[0084] according to Figure 11 A functional area 132 is provided on one of the four interconnected wall portions of the third wall 130. This area is a cutout, where the casing of the battery cell is exposed or accessible. The functional area 132 can be a contact area through which the aforementioned detection device can be connected to the outer surface of the casing. Here, by arranging the contact area on the wall portion without terminals, the battery cells can be inspected not only before being placed into the housing (individually or in the form of battery modules) but also after placement, which obviously facilitates quality control of the battery pack. Furthermore, corresponding electronic components (e.g., circuit boards) are typically located above the first wall 110, which serves as a cover plate and has terminals; therefore, arranging the contact area closer to the first wall 110 facilitates wiring. It should be understood that the above arrangement of the contact area is merely exemplary and not limiting; the size and location of the contact area can be modified depending on the required creepage resistance and the structure of the aforementioned detection device (specifically, its probe or probe).

[0085] According to Figure 12 On one of the four wall sections of the third wall 130 that are connected to each other, in particular on the large face of the side wall that has a larger area, a functional area 132 is provided, which is a hollowed-out area, and at which the housing of the battery cell is exposed or accessible. The functional area 132 is a clamping area, at which a clamping device can be clamped on the outer surface of the third wall 130 of the housing. By means of the clamping area, the clamping device can be stably clamped directly or indirectly on the outer surface of the housing when the battery cell is being transferred. By means of the clamping area, it is possible to avoid creasing the insulating film on the third wall 130 when the battery cell is being transferred. It is to be understood here that the above-described arrangement of the clamping area is exemplary and not limiting, and that the dimensions and the position of the clamping area can be modified depending on the required creepage resistance and the structure of the clamping device.

[0086] In an embodiment not shown, the functional area can also be an identification area, which is located on a wall section of the third wall that is not provided with a pole, i.e. the wall section on which the identification area 116 of the first wall 110 is transferred to the wall section in the embodiment according to Figure 3 . On the identification area, a parameter identification of the battery cell is provided, which can be implemented by means of a code spray or laser etching. The parameter identification can relate to the type, the dimensions, the manufacturing information or other information that can be used for tracing of the battery cell. Exemplarily, the parameter identification can be implemented in the form of a two-dimensional code. It is to be understood here that the dimensions and the position of the identification area are modified depending on at least the required creepage resistance.

[0087] According to Figure 13 , another embodiment of a battery cell according to the application is shown, in which the positive pole and the negative pole are located on two opposite wall sections of the third wall 130. This type of battery cell can also be referred to as a blade cell. On the second wall 120, a second insulating element 121 is provided, which is an insulating coating and overlaps the third insulating element 131 that extends from the third wall 130. In this type of battery cell, the second wall 120 can be used for adhesive fixing in the box, and on the first wall 110, a fixing area 113 is provided for fixing with a press strip.

[0088] In another modification of the battery cell according to Figure 13 , the first wall 110 and the second wall 120 are both used as fixing walls, i.e. the first wall 110 is glued and supported in the box, and the second wall 120 is glued and supported in the box. In this modification, a fixing area 113 is provided on both the first wall 110 and the second wall 120, on which a first insulating element is respectively provided, which can be implemented as described above.

[0089] Furthermore, according to the second aspect of the present application, a battery module comprising a plurality of battery cells according to at least one of the above- described embodiments is proposed. According to Figure 14 , the battery module comprises two rows of battery cells, each row of battery cells being arranged and stacked along a predetermined direction (i.e. the X-direction, indicated by the double arrow in Figure 14 , wherein the pressing strip 200 is bonded to the fixation area of each battery cell of both rows of battery cells at the same time, thereby fixing all battery cells comprised with respect to each other. It is also possible that the pressing strip only acts on one row of battery cells arranged along the predetermined direction.

[0090] In the battery module integrated from a plurality of battery cells according to Figure 15 , the plurality of battery cells is fixed with respect to each other by means of three pressing strips 200. The battery cells shown in Figure 15 are the above-mentioned coin cells.

[0091] Here, it is to be understood that the arrangement of the module or pack integrated from a plurality of battery cells according to the present application is merely exemplary and not limiting. The battery module according to the present application can in particular derive the advantages and features already described with respect to the battery cell according to the present application, with reference to which the above- described explanations apply accordingly.

[0092] According to the third aspect of the present application, a battery pack comprising a housing and a plurality of battery cells according to at least one of the above- described embodiments is proposed. The battery pack can be a high-voltage battery pack, which is used as a power battery, for example, in a new energy vehicle, or a low-voltage battery pack, which is used to provide electrical energy for the implementation of corresponding functions in the sleep state of a vehicle, for example, in a new energy vehicle. In addition, the battery pack usually also comprises other accessories such as a power distribution device, a sampling device, a pressure relief device, etc., which are not described in detail and are not limited thereto.

[0093] In the battery pack, a plurality of battery cells 100 are arranged along a predetermined direction and are each supported in the housing by means of the second wall 110 thereof. Battery cells of the same row or battery cells of two adjacent rows are also fixed with respect to each other by means of a pressing strip 200, wherein the pressing strip is fixed to the first insulating member 114 at the fixation area 113 of each battery cell 100.

[0094] Exemplarily, in the battery pack, the second wall 120 of the battery cell 100 can be bonded to a carrier plate below the housing in order to be supported in the housing, and the first wall 110 of the battery cell 100 opposite the second wall is fixed to the pressing strip 200 above. The carrier plate can be a heat exchange plate, for example.

[0095] In another embodiment, in the battery pack, the second wall 120 of the battery cell 100 can be bonded to an upper load plate of the case so as to be supported in the case, and the first wall 110 of the battery cell 100 opposite to the second wall is fixed with a lower pressing strip 200.

[0096] In another embodiment, a part of the automobile chassis can constitute a part of the case, for example, a part of the automobile floor is a part of the case. Here, the second wall 120 of the battery cell can be bonded to the upper automobile floor so as to be supported in the case, and the first wall 110 of the battery cell 100 opposite to the second wall 120 is fixed with the lower pressing strip 200. Alternatively, the second wall 120 of the battery cell 100 can be bonded to the lower automobile floor so as to be supported in the case, and the first wall 110 of the battery cell 100 opposite to the second wall 120 is fixed with the upper pressing strip 200.

[0097] Here, the battery pack according to the present application can derive the advantages and features already described with respect to the battery cell according to the present application, and with respect to this, reference can be made to the description made with respect to the battery cell according to the present application.

[0098] Finally, the fourth aspect according to the present application also proposes an electric device comprising the battery cell described above, or comprising the battery module described above, or comprising the battery pack described above. The electric device can be, but is not limited to, the new energy automobile mentioned above.

[0099] Here, the electric device according to the present application can derive the advantages and features already described with respect to the battery cell according to the present application, and with respect to this, reference can be made to the description made with respect to the battery cell according to the present application.

[0100] It should be understood that all the above preferred embodiments are exemplary but not limiting, and various modifications, variations, or combinations of the above described specific embodiments made by those skilled in the art under the concept of the present application shall be within the legal protection scope of the present application.

Claims

1. A battery cell comprising a casing and an electrode assembly housed in the casing, characterized by, The shell comprises: a first wall, an outer surface of which comprises a fixing area for fixing a compression strip; and a second wall, which is opposite to the first wall along a thickness direction of the first wall and is used for being supported in a box, wherein a first insulating member is covered on the fixing area, the first insulating member being an insulating coating or an insulating adhesive comprising a substrate layer and a UV adhesive layer which are laminated with each other.

2. The battery cell of claim 1, wherein, The insulating adhesive is single-sided adhesive, wherein the UV adhesive layer is adhered to the outer surface of the first wall at the fixing area, and the substrate layer is used for being adhered to the compression strip.

3. The battery cell of claim 1, wherein, The insulating adhesive is double-sided adhesive and comprises a first UV adhesive layer, a substrate layer and a second UV adhesive layer which are laminated with each other in sequence, wherein the first UV adhesive layer is adhered to the outer surface of the first wall at the fixing area, and the second UV adhesive layer is used for being adhered to the compression strip.

4. The battery cell according to claim 2 or 3, characterized in that, An adhesive strength between the insulating adhesive and the outer surface of the first wall is at least greater than an adhesive strength between the insulating adhesive and the compression strip.

5. The battery cell of claim 1, wherein, A thickness of the insulating adhesive is between 0.02 mm and 0.5 mm.

6. The battery cell of claim 1, wherein, A second insulating member is covered on the second wall, the second insulating member being an insulating coating.

7. The battery cell of claim 6, wherein, The second insulating member on the second wall is provided with a hollow area, at which an outer surface of the second wall is directly adhered and supported in the box.

8. The battery cell of claim 1, wherein, The battery monomer is square, and the shell further comprises a third wall which is connected with the first wall and the second wall respectively and jointly limits a cavity for accommodating the battery cell assembly, the third wall comprising four wall portions which are connected in sequence.

9. The battery cell of claim 8, wherein, The first wall is provided with a positive electrode post and a negative electrode post which are electrically connected with the battery cell assembly respectively, and a third insulating member is covered on the third wall, the third insulating member extending from the third wall towards the first wall connected with the third wall until covering a part of the outer surface of the first wall.

10. The battery cell of claim 9, wherein, The first insulating member is arranged in an edge area of the first wall adjacent to the third wall and has an overlapping area with the third insulating member on the first wall.

11. The battery cell of claim 9, wherein, A fourth insulating member is further provided on the first wall, wherein an edge of the fourth insulating member jointly limits the fixing area with an edge of the third insulating member on the first wall, or the fourth insulating member is provided with a hollow area corresponding to the fixing area along a thickness direction of the first wall.

12. The battery cell of claim 11, wherein, The fourth insulating member is an insulating sheet.

13. The battery cell of claim 9, wherein, The third insulating member is an insulating film.

14. The battery cell of claim 8, wherein, The first wall is further used for being supported in the box, and an outer surface of the second wall further comprises the fixing area for fixing the compression strip and the first insulating member is covered on the fixing area.

15. The battery cell of claim 14, wherein, The positive electrode post and the negative electrode post which are electrically connected with the battery cell assembly respectively are provided on two wall portions of the third wall which are opposite to each other.

16. The battery cell of claim 8, wherein, A hollow area is provided on a wall portion of the four wall portions of the third wall which is not provided with the positive electrode post and the negative electrode post, the hollow area being a functional area selected from a group comprising: a contact area through which a detection device can be connected to an outer surface of the shell; a clamping area at which a clamping device can be clamped on the outer surface of the shell; and a An identification area, on which a parameter identification of the battery cell is arranged.

17. A battery module, comprising: A battery module comprising a plurality of battery cells according to any one of claims 1 to 16, which are arranged along a predetermined direction and fixed relative to each other by means of a pressing strip, wherein the pressing strip is fixed on the first insulating member at the fixing area of the battery cell.

18. A battery pack, characterized by, A battery pack comprising a box and a plurality of battery cells according to any one of claims 1 to 16, which are arranged along a predetermined direction and respectively supported in the box by means of the second wall thereof, and which are further fixed relative to each other by means of a pressing strip, wherein the pressing strip is fixed on the first insulating member at the fixing area of the battery cell.

19. An electrical device, comprising: A battery cell according to any one of claims 1 to 16, or a battery module according to claim 17, or a battery pack according to claim 18.

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