Battery cell and battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery cell and battery pack, including battery cell shell, the length direction of battery cell shell side is equipped with opening, cover plate assembly covers opening;Multiple first insulating film, multiple first insulating film paste along the length direction interval arrangement of battery cell shell and paste in the width direction of battery cell shell at least one side;At least one second insulating film, second insulating film is at least pasted in the thickness direction both sides of battery cell shell.The utility model is by reserving certain space between adjacent two first insulating films as windowing, without being set on second insulating film again windowing structure, to reduce the material cost of second insulating film, and the windowing step of second insulating film is reduced, to improve the production efficiency of insulating film.In the first insulating film and second insulating film pasted on battery cell shell, additional positioning equipment is also not needed, to reduce the use cost of positioning equipment, improve the film efficiency of battery cell shell.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery cells and battery packs. Background Technology

[0002] Battery cells, such as lithium-ion cells, are widely used in various fields such as transportation power supply, power storage, new energy storage power supply, aerospace and military industries due to their advantages such as large capacity, high operating voltage, strong charge retention capability and long cycle life.

[0003] Currently, the common practice is to wrap the outside of the battery cell casing with an insulating film as an insulating protective structure. However, due to the low adhesive strength of the insulating film, adhesion failure and detachment often occur during mechanical vibration / impact tests. Creating windows in the insulating film and applying structural adhesive to these windows can improve the adhesion strength between the battery cell and the battery pack casing. However, creating windows in the insulating film requires high precision in equipment positioning during the wrapping process, necessitating the use of multiple positioning devices to detect the cell wrapping dimensions, thus reducing wrapping efficiency. Furthermore, creating windows in the insulating film increases the material cost of the insulating film and reduces its production efficiency. Utility Model Content

[0004] In view of this, the present invention provides a battery cell and battery pack to solve the problem of low production efficiency of insulating film and battery cell sheath.

[0005] In a first aspect, this utility model provides a battery cell, comprising:

[0006] A battery cell housing, wherein an opening is provided on one side along the length direction of the battery cell housing, and the cover plate assembly covers the opening;

[0007] A plurality of first insulating films are arranged at intervals along the length direction of the cell housing and are affixed to at least one side of the cell housing in the width direction.

[0008] At least one second insulating film is attached to at least two sides of the cell housing in the thickness direction.

[0009] Beneficial effects: By affixing multiple first insulating films to at least one side of the cell casing and arranging them spaced apart along the length of the cell casing, a certain space is reserved between each pair of adjacent first insulating films to serve as an opening. This allows structural adhesive to be applied to the opening, improving the bonding strength between the cell casing and the battery pack housing and reducing the risk of detachment due to adhesive failure during battery pack use. After affixing the first insulating film to one side of the cell casing, a second insulating film is affixed to the other sides of the cell casing where the first insulating film is not attached, thus achieving external insulation of the cell casing. Since an opening is pre-reserved on one side of the cell casing through the affixing of the first insulating film, there is no need to set up an opening structure on the second insulating film, thereby reducing the material cost of the second insulating film and reducing the number of opening steps, thus improving the production efficiency of the insulating film. Furthermore, no additional positioning equipment is needed when affixing the first and second insulating films to the cell casing, reducing the cost of positioning equipment and improving the coating efficiency of the cell casing.

[0010] In one optional embodiment, a plurality of first insulating films are affixed to one side of the cell housing in the width direction; the first insulating film includes a first main body portion and extension portions disposed at both ends of the first main body portion, the first main body portion is bonded to one side of the cell housing in the width direction, and the extension portions at both ends are bonded to both sides of the cell housing in the thickness direction.

[0011] In one optional embodiment, the number of the second insulating film is one, and the second insulating film is attached to both sides in the thickness direction and the other side in the width direction of the cell housing.

[0012] In one optional embodiment, the second insulating film includes two opposing second main body portions and a connecting portion connected to the two second main body portions, the two second main body portions being respectively bonded to both sides of the cell housing in the thickness direction, and the connecting portion being bonded to the other side of the cell housing in the width direction;

[0013] The second main body has a first flange at one end away from the connecting part, and the first flange is bonded to a corner of the cell housing away from the connecting part in the width direction.

[0014] In one optional embodiment, a plurality of first insulating films are attached to both sides of the cell housing in the width direction; the first insulating film includes a first main body portion and extension portions disposed at both ends of the first main body portion, the first main body portion is bonded to both sides of the cell housing in the width direction, and the extension portions at both ends are bonded to both sides of the cell housing in the thickness direction.

[0015] In one optional embodiment, there are two second insulating films, which are respectively attached to both sides of the cell housing in the thickness direction.

[0016] In one alternative embodiment, the second insulating film includes a second main body and second flanges located at both ends of the second main body, the second flanges being bonded to the two corners on both sides of the cell housing in the width direction.

[0017] Secondly, this utility model also provides a battery cell, comprising:

[0018] A cell housing and a cover plate assembly, wherein the cell housing has an opening on one side in the height direction, and the cover plate assembly covers the opening;

[0019] At least one first insulating film is attached to at least one side of the cell housing along its length.

[0020] At least one second insulating film is attached to both sides of the cell housing in the width direction and to the side away from the cover plate assembly in the height direction.

[0021] In one optional embodiment, the second insulating film includes two opposing second main body portions and a connecting portion connected to the two second main body portions, the two second main body portions being respectively bonded to both sides of the cell housing in the width direction, and the connecting portion being bonded to the side of the cell housing away from the cover plate assembly in the height direction.

[0022] The second main body has a third flange at both ends along its length, and the connecting part has a fourth flange at both ends along its length. The third flange and the fourth flange are both bonded to the two corners along the length of the battery cell housing.

[0023] Thirdly, this utility model also provides a battery pack, comprising:

[0024] Battery pack housing;

[0025] Multiple battery cells as described above are coated with structural adhesive on at least one side of the cell housing in the width direction, and the side of the cell housing coated with the structural adhesive abuts against the battery pack housing, so that the multiple battery cells are arranged in the battery pack housing; or

[0026] Structural adhesive is applied to at least one side of the cell housing along its length, and the side of the cell housing coated with the structural adhesive is brought into contact with the battery pack housing, so that a plurality of the cells are arranged in the battery pack housing.

[0027] Beneficial effects: By applying structural adhesive to at least one side of the cell housing in the width direction or at least one side in the length direction, the cell housing is firmly connected to the battery pack housing, thereby improving the bonding strength between the cell housing and the battery pack housing and reducing the risk of the cell housing falling off due to bonding failure during the use of the battery pack. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a perspective view of a battery cell according to an embodiment of the present utility model;

[0030] Figure 2 This is another perspective view of a battery cell according to an embodiment of the present utility model;

[0031] Figure 3 This is a schematic diagram of a battery cell with a first insulating film attached to one side, according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of a battery cell after the first insulating film and the second insulating film are attached according to an embodiment of the present utility model.

[0033] Figure 5 for Figure 4 Enlarged diagram of A in the middle;

[0034] Figure 6 This is a schematic diagram of a battery cell with a first insulating film attached to both sides according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of a battery cell after the first insulating film and the second insulating film are attached, according to another embodiment of the present invention.

[0036] Figure 8 for Figure 7 Enlarged diagram of B in the middle;

[0037] Figure 9 This is a schematic diagram of a battery cell with a second insulating film attached to three sides according to an embodiment of the present invention;

[0038] Figure 10 This is a schematic diagram of the structure of a battery cell after the first insulating film and the second insulating film are attached, according to another embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 100, Cell housing; 110, Cover plate assembly; 200, First insulating film; 210, First main body; 220, Extension; 300, Second insulating film; 310, Second main body; 320, Connecting part; 330, First flange; 340, Second flange; 350, Third flange; 360, Fourth flange. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0043] According to embodiments of the present invention, on the one hand, in conjunction with reference to... Figure 1 , Figure 2 A battery cell is provided, comprising: a battery cell housing 100, wherein an opening is provided on one side of the battery cell housing 100 in the length direction, and a cover plate assembly 110 covers the opening; a plurality of first insulating films 200, wherein the plurality of first insulating films 200 are arranged at intervals along the length direction of the battery cell housing 100 and are affixed to at least one side of the battery cell housing 100 in the width direction; and at least one second insulating film 300, wherein the second insulating film 300 is affixed to at least two sides of the battery cell housing 100 in the thickness direction.

[0044] In this embodiment, the battery cell includes a battery cell housing 100, which has a receiving cavity and an opening communicating with the receiving cavity for installing electrode assemblies and electrolytes into the receiving cavity. A cover plate assembly 110 is provided on one side of the battery cell housing 100 along its length. By sealing the opening with the cover plate assembly 110, the cover plate assembly 110 and the battery cell housing 100 form a closed space, which can effectively protect the electrode assemblies and other internal components from external physical damage, such as collisions and compression; it can also prevent dust, moisture and other impurities from entering the receiving cavity, avoiding affecting the normal operation of the battery cell and reducing the probability of short circuits, corrosion and other failures.

[0045] A plurality of first insulating films 200 are affixed to at least one side of the cell housing 100, and the plurality of first insulating films 200 are spaced apart along the length direction of the cell housing 100, such that a certain space is reserved between each two adjacent first insulating films 200 to serve as an opening. Structural adhesive can then be applied to the opening to improve the bonding strength between the cell housing 100 and the battery pack housing, reducing the risk of the cell housing 100 detaching from the battery pack housing due to adhesive failure during battery pack use. After the first insulating films 200 are affixed to one side of the cell housing 100, second insulating films 300 are affixed to the other sides of the cell housing 100 where the first insulating films 200 are not affixed, thereby achieving external insulation of the cell housing 100. Since an opening has already been pre-drilled on one side of the cell housing 100 through the application of the first insulating film 200, there is no need to set up an opening structure on the second insulating film 300, thereby reducing the material cost of the second insulating film 300 and reducing the number of opening steps, thus improving the production efficiency of the insulating film. When applying the first insulating film 200 and the second insulating film 300 to the cell housing 100, there is also no need to add additional positioning equipment, reducing the cost of using positioning equipment and improving the coating efficiency of the cell housing 100.

[0046] In this embodiment of the invention, the battery cell can be a secondary battery cell, which refers to a battery cell that can be reactivated by charging after discharge and continue to be used. The battery cell can be a lithium-ion battery cell, sodium-ion battery cell, sodium-lithium-ion battery cell, lithium-sulfur battery cell, magnesium-ion battery cell, nickel-metal hydride battery cell, nickel-cadmium battery cell, lead-acid battery cell, etc., and this embodiment of the invention is not limited to this.

[0047] In some implementations, the battery cell in this utility model embodiment can be a metal battery cell. Specifically, the metal battery cell may include a lithium metal secondary battery cell, a sodium metal battery cell, or a magnesium metal battery cell, etc. This utility model embodiment does not limit this.

[0048] The electrode assembly of a battery cell includes a positive electrode, a negative electrode, and an insulating component. During the charging and discharging process, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The insulating component, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0049] In some implementations, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0050] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0051] In some implementations, the negative electrode can be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0052] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0053] In some implementations, the separator is a separator membrane. This invention does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0054] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0055] In some implementations, the separator is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0056] In some implementations, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This invention does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0057] In some implementations, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0058] The battery cell in this embodiment can be a cylindrical cell, a prismatic cell, a pouch cell, or a cell of other shapes. The prismatic cell can include a prismatic cell, a blade-shaped cell, or other polyprismatic cells, such as a hexagonal prismatic cell or an octagonal prismatic cell; however, this embodiment is not limited to these.

[0059] See also Figure 3 In one embodiment, a plurality of first insulating films 200 are attached to one side of the cell housing 100 in the width direction; the first insulating film 200 includes a first main body 210 and extensions 220 at both ends of the first main body 210, the first main body 210 is bonded to one side of the cell housing 100 in the width direction, and the extensions 220 at both ends are bonded to both sides of the cell housing 100 in the thickness direction.

[0060] In this embodiment, the battery cell is a blade-shaped cell. Multiple first insulating films 200 are affixed to any one side of the battery cell's width direction, i.e., one of the narrow faces of the battery cell housing 100, and the multiple first insulating films 200 are spaced apart along the length direction of the battery cell housing 100. The spacing between two adjacent first insulating films 200 is used as a window, allowing structural adhesive to be applied between adjacent first insulating films 200. Then, the side coated with structural adhesive can be connected to the battery pack housing, thus bonding the battery cell housing 100 to the battery pack housing. The number of first insulating films 200 determines the number of windows, and the position of the first insulating films 200 determines the position and area of ​​the windows. The number of first insulating films 200 and the spacing between two adjacent first insulating films 200 can be determined according to the requirements of applying structural adhesive and are not specifically limited. Determining the number, position, and area of ​​windows by affixing first insulating films 200 to the battery cell housing 100 offers high flexibility, and the window spacing is unrestricted. The first insulating film 200 includes a first main body 210, with extensions 220 at both ends. After the first main body 210 is bonded to one side of the cell housing 100 in the width direction, the extensions 220 bond both ends of the first insulating film 200 to both sides of the cell housing 100 in the thickness direction, respectively. This ensures that the first insulating film 200 is firmly attached to the cell housing 100, preventing it from detaching. The length of the extensions 220 can be half or a quarter of the length of the first main body 210, allowing them to be bonded to both sides of the cell housing 100 in the thickness direction and ensuring a secure connection of the first main body 210.

[0061] See also Figure 4 , Figure 5 In one embodiment, the number of second insulating films 300 is one, and the second insulating film 300 is attached to both sides in the thickness direction and the other side in the width direction of the cell housing 100.

[0062] In this embodiment, the second insulating film 300 begins to cover the cell housing 100 from the other side in the width direction, that is, the side opposite to the first insulating film 200, so that the second insulating film 300 is attached to another narrow surface in the width direction of the cell housing 100. Then, the second insulating film 300 is attached to both sides in the thickness direction of the cell housing 100, thereby covering the other sides of the cell housing 100 where the first insulating film 200 is not attached, to achieve external insulation of the cell housing 100. The second insulating film 300 can be directly obtained by cutting the whole insulating film, thereby effectively improving the production efficiency of the second insulating film 300 and reducing the cost of the insulating film. Moreover, since the second insulating film 300 is a whole, there is no need to open windows in the second insulating film 300, and the problem of unstable tension of the insulating film during the film application process will not occur due to too many windows, thereby improving the production yield of the second insulating film 300.

[0063] In one embodiment, the second insulating film 300 includes a second main body portion 310 disposed opposite to each other and a connecting portion 320 connected to the two second main body portions 310. The two second main body portions 310 are respectively bonded to both sides in the thickness direction of the cell housing 100, and the connecting portion 320 is bonded to the other side in the width direction of the cell housing 100. A first flange 330 is provided at one end of the second main body portion 310 away from the connecting portion 320. The first flange 330 is bonded to a corner of the cell housing 100 in the width direction away from the connecting portion 320.

[0064] In this embodiment, the second insulating film 300 consists of two opposing second main body portions 310 and a connecting portion 320 for connecting the two second main body portions 310. When the second insulating film 300 is attached to the cell housing 100, the connecting portion 320 is attached to the side of the cell housing 100 opposite to the first insulating film 200, and then the two second main body portions 310 are attached to both sides of the cell housing 100 in the thickness direction. Further, a first flange 330 is provided at the end of the second main body portion 310 away from the connecting portion 320. When the second insulating film 300 covers both sides of the cell housing 100 in the thickness direction and the other side in the width direction, the first flanges 330 at both ends of the second insulating film 300 are located on the side of the cell housing 100 where the first insulating film 200 is attached. Then, the first flanges 330 at both ends of the second insulating film 300 are folded to the side of the cell housing 100 where the first insulating film 200 is attached, and the first flanges 330 are glued to the corner of the side of the cell housing 100 where the first insulating film 200 is attached, so that the second insulating film 300 can cover the side of the cell housing 100 where the first insulating film 200 is not attached and cover the edges of the cell housing 100, thereby providing a more comprehensive coverage of the cell housing 100 and preventing the cell housing 100 from directly contacting external components, so as to achieve external insulation of the cell housing 100.

[0065] See also Figures 6 to 8 In one embodiment, a plurality of first insulating films 200 are attached to both sides of the cell housing 100 in the width direction; the first insulating film 200 includes a first main body portion 210 and extension portions 220 provided at both ends of the first main body portion 210, the first main body portion 210 is bonded to both sides of the cell housing 100 in the width direction, and the extension portions 220 at both ends are bonded to both sides of the cell housing 100 in the thickness direction.

[0066] In this embodiment, the battery cell is a blade-shaped cell. Multiple first insulating films 200 can be affixed to both sides of the battery cell's width direction, i.e., the two narrow faces of the battery cell housing 100, according to specific usage requirements, and the multiple first insulating films 200 are spaced apart along the length direction of the battery cell housing 100. The interval between two adjacent first insulating films 200 is used as a window, allowing structural adhesive to be applied between adjacent first insulating films 200; then, the side coated with structural adhesive can be connected to the battery pack housing, thus bonding the battery cell housing 100 to the battery pack housing. The number, position, and area of ​​the windows are determined by affixing the first insulating films 200 to the battery cell housing 100, offering high flexibility, and the window spacing is unrestricted. The first insulating film 200 includes a first main body 210, with extensions 220 at both ends of the first main body 210. After the first main body 210 is bonded to one side of the cell housing 100 in the width direction, the two ends of the first insulating film 200 are bonded to both sides of the cell housing 100 in the thickness direction through the extensions 220, so that the first insulating film 200 can be firmly attached to the cell housing 100 and prevent the first insulating film 200 from falling off the cell housing 100.

[0067] In one embodiment, there are two second insulating films 300, which are respectively attached to both sides of the cell housing 100 in the thickness direction.

[0068] In this embodiment, two second insulating films 300 are provided, and the two second insulating films 300 are respectively attached to both sides of the cell housing 100 in the thickness direction, thereby covering the other sides of the cell housing 100 where the first insulating film 200 is not attached, to achieve external insulation of the cell housing 100. The second insulating film 300 can be directly obtained by cutting the whole insulating film, thereby effectively improving the production efficiency of the second insulating film 300 and reducing the cost of the insulating film. Moreover, since the second insulating film 300 is a whole, there is no need to open windows in the second insulating film 300, and the problem of unstable tension of the insulating film during the film application process will not occur due to too many windows, thereby improving the production yield of the second insulating film 300.

[0069] In one embodiment, the second insulating film 300 includes a second main body portion 310 and second flanges 340 located at both ends of the second main body portion 310. The second flanges 340 are bonded to the two corners on both sides of the battery cell housing 100 in the width direction.

[0070] In this embodiment, the second insulating film 300 includes a second main body 310, and each of the second main body 310 has a second flange 340 at both ends. When the second main body 310s of the two second insulating films 300 are respectively attached to both sides of the cell housing 100 in the thickness direction, the second flanges 340 at both ends of each second insulating film 300 are located on both sides of the cell housing 100 where the first insulating film 200 is attached. Then, the second flanges 340 at both ends of the second insulating film 300 are folded to the sides of the cell housing 100 where the first insulating film 200 is attached, and the second flanges 340 are bonded to the corners of the cell housing 100 where the first insulating film 200 is attached, so that the second insulating film 300 can cover the sides of the cell housing 100 where the first insulating film 200 is not attached and cover the edges of the cell housing 100, thereby providing a more comprehensive coverage of the cell housing 100 and preventing the cell housing 100 from directly contacting external components, thus achieving external insulation of the cell housing 100.

[0071] See also Figure 9 , Figure 10 Secondly, the present invention also provides a battery cell, comprising: a battery cell housing 100 and a cover plate assembly 110, wherein the battery cell housing 100 has an opening on one side in the height direction, and the cover plate assembly 110 seals the opening; at least one first insulating film 200, the first insulating film 200 being attached to at least one side in the length direction of the battery cell housing 100; and at least one second insulating film 300, the second insulating film 300 being attached to both sides in the width direction and the side in the height direction away from the cover plate assembly 110 of the battery cell housing 100.

[0072] In this embodiment, the battery cell is a prismatic cell. The battery cell includes a cell housing 100, which has a receiving cavity and an opening communicating with the receiving cavity for installing electrode components and electrolytes into the receiving cavity. A cover plate assembly 110 is provided on one side of the cell housing 100 along its length. By sealing the opening with the cover plate assembly 110, the cover plate assembly 110 and the cell housing 100 form a closed space, which can effectively protect the electrode components and other internal components from external physical damage, such as collisions and compression; it can also prevent dust, moisture and other impurities from entering the receiving cavity, avoiding affecting the normal operation of the battery cell and reducing the probability of short circuits, corrosion and other failures.

[0073] Furthermore, the second insulating film 300 is applied starting from the side of the cell housing 100 away from the cover plate assembly 110 in the height direction, so that the second insulating film 300 is attached to the bottom of the cell housing 100; then the second insulating film 300 is attached to both sides of the cell housing 100 in the width direction, thereby covering the cell housing 100 with the second insulating film 300 to achieve external insulation of the cell housing 100. The second insulating film 300 can be directly obtained by cutting the whole insulating film, thereby effectively improving the production efficiency of the second insulating film 300 and reducing the cost of the insulating film. Moreover, since the second insulating film 300 is a whole, there is no need to open windows in the second insulating film 300, and the problem of unstable tension of the insulating film during the film application process will not occur due to too many windows in the insulating film, thereby improving the production yield of the second insulating film 300.

[0074] After the second insulating film 300 is attached to the cell housing 100, at least one first insulating film 200 is attached to at least one side of the cell housing 100, leaving a certain space between the first insulating film 200 and the top or bottom of the cell housing 100 as a window. Structural adhesive can then be applied to the window to improve the bonding strength between the cell housing 100 and the battery pack housing, reducing the risk of detachment due to adhesive failure during battery pack use. By attaching the first insulating film 200 and leaving a window on one side of the cell housing 100, there is no need to add a window structure to the second insulating film 300, thus reducing the material cost of the second insulating film 300 and the windowing steps, thereby improving the production efficiency of the insulating film. Furthermore, attaching the first insulating film 200 and the second insulating film 300 to the cell housing 100 also eliminates the need for additional positioning equipment, reducing the cost of positioning equipment and improving the coating efficiency of the cell housing 100.

[0075] In one embodiment, the second insulating film 300 includes a second main body portion 310 disposed opposite to each other and a connecting portion 320 connected to the two second main body portions 310. The two second main body portions 310 are respectively bonded to both sides of the cell housing 100 in the width direction, and the connecting portion 320 is bonded to the side of the cell housing 100 away from the cover plate assembly 110 in the height direction. The two ends of the second main body portion 310 in the length direction are provided with third flanges 350, and the two ends of the connecting portion 320 in the length direction are provided with fourth flanges 360. The third flanges 350 and the fourth flanges 360 are both bonded to the corners on both sides of the cell housing 100 in the length direction.

[0076] In this embodiment, the second insulating film 300 consists of two opposing second main body portions 310 and a connecting portion 320 for connecting the two second main body portions 310. When the second insulating film 300 is attached to the cell housing 100, the connecting portion 320 is attached to the side of the cell housing 100 opposite to the cover plate assembly 110, and then the two second main body portions 310 are attached to both sides of the cell housing 100 in the width direction. Further, the second main body portions 310 of the second insulating film 300 attached to both sides of the cell housing 100 in the width direction are provided with third flanges 350 at both ends. When the second insulating film 300 is attached to both sides of the cell housing 100 in the width direction, the third flanges 350 at both ends of the second insulating film 300 are respectively located on both sides of the cell housing 100 in the length direction, and then the third flanges 350 are bonded to the corners on both sides of the cell housing 100 in the length direction. The second main body 310 of the second insulating film 300, which is attached to the side of the cell housing 100 away from the cover plate assembly 110 in the height direction, has fourth flanges 360 at both ends. When the second insulating film 300 is attached to the side of the cell housing 100 away from the cover plate assembly 110 in the height direction, the fourth flanges 360 at both ends of the second insulating film 300 are located on both sides of the length direction of the cell housing 100, and then the fourth flanges 360 are bonded to the corners on both sides of the length direction of the cell housing 100. By attaching both the third flange 350 and the fourth flange 360 ​​to both sides of the length direction of the cell housing 100, the second insulating film 300 can cover the side of the cell housing 100 where the first insulating film 200 is not attached, as well as the edges of the cell housing 100, thereby providing a more comprehensive coverage of the cell housing 100 and preventing the cell housing 100 from directly contacting external components, thus achieving external insulation of the cell housing 100.

[0077] Thirdly, this utility model also provides a battery pack, including: a battery pack housing; a plurality of battery cells, wherein structural adhesive is coated on at least one side of the battery cell housing 100 in the width direction, and the side of the battery cell housing 100 coated with structural adhesive abuts against the battery pack housing, so that the plurality of battery cells are arranged in the battery pack housing; or structural adhesive is coated on at least one side of the battery cell housing 100 in the length direction, and the side of the battery cell housing 100 coated with structural adhesive abuts against the battery pack housing, so that the plurality of battery cells are arranged in the battery pack housing.

[0078] In this embodiment, multiple battery cells are connected in series, parallel, or mixed via a busbar component. Multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into battery modules, and then the battery modules can be assembled into a battery pack; the battery cells or battery modules are housed within the battery pack housing. When the battery cell is a blade-shaped cell, structural adhesive can be applied to at least one side of the cell housing 100 in the width direction; when the battery cell is a prismatic cell, structural adhesive can be applied to at least one side of the cell housing 100 in the length direction. The structural adhesive further secures the cell housing 100 to the battery pack housing, improving the bonding strength between the cell housing 100 and the battery pack housing and reducing the risk of detachment due to adhesive failure during battery pack use.

[0079] In some implementations, the battery pack housing can be part of the vehicle's chassis structure. For example, a portion of the battery pack housing can be at least part of the vehicle's floor, or a portion of the battery pack housing can be at least part of the vehicle's crossbeams and longitudinal beams.

[0080] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, include: A cell housing and a cover plate assembly, wherein the cell housing has an opening on one side along its length, and the cover plate assembly covers the opening; A plurality of first insulating films are arranged at intervals along the length direction of the cell housing and are attached to at least one side of the cell housing in the width direction. At least one second insulating film is attached to at least two sides of the cell housing in the thickness direction.

2. The battery cell according to claim 1, characterized in that, A plurality of first insulating films are affixed to one side of the battery cell housing in the width direction; the first insulating film includes a first main body and extensions at both ends of the first main body, the first main body is bonded to one side of the battery cell housing in the width direction, and the extensions at both ends are bonded to both sides of the battery cell housing in the thickness direction.

3. The battery cell according to claim 2, characterized in that, The second insulating film is one in number, and the second insulating film is attached to both sides of the cell housing in the thickness direction and the other side in the width direction.

4. The battery cell according to claim 3, characterized in that, The second insulating film includes two opposing second main bodies and a connecting portion connected to the two second main bodies. The two second main bodies are respectively bonded to both sides of the cell housing in the thickness direction, and the connecting portion is bonded to the other side of the cell housing in the width direction. The second main body has a first flange at one end away from the connecting part, and the first flange is bonded to the corner of the cell housing away from the connecting part in the width direction.

5. The battery cell according to claim 1, characterized in that, Multiple first insulating films are attached to both sides of the battery cell housing in the width direction; the first insulating film includes a first main body and extensions at both ends of the first main body, the first main body is bonded to both sides of the battery cell housing in the width direction, and the extensions at both ends are bonded to both sides of the battery cell housing in the thickness direction.

6. The battery cell according to claim 5, characterized in that, There are two second insulating films, which are respectively attached to both sides of the cell housing in the thickness direction.

7. The battery cell according to claim 6, characterized in that, The second insulating film includes a second main body and second flanges located at both ends of the second main body. The second flanges are bonded to the two corners on both sides of the battery cell housing in the width direction.

8. A battery cell, characterized in that, include: A cell housing and a cover plate assembly, wherein the cell housing has an opening on one side in the height direction, and the cover plate assembly covers the opening; At least one first insulating film is attached to at least one side of the cell housing along its length. At least one second insulating film is attached to both sides of the cell housing in the width direction and to the side away from the cover plate assembly in the height direction.

9. The battery cell according to claim 8, characterized in that, The second insulating film includes a second main body portion disposed opposite to each other and a connecting portion connected to the two second main body portions. The two second main body portions are respectively bonded to both sides of the cell housing in the width direction, and the connecting portion is bonded to the side of the cell housing away from the cover plate assembly in the height direction. The second main body has a third flange at both ends along its length, and the connecting part has a fourth flange at both ends along its length. The third flange and the fourth flange are both bonded to the two corners along the length of the battery cell housing.

10. A battery pack, characterized in that, include: Battery pack housing; A plurality of battery cells as described in any one of claims 1 to 7 are provided, wherein structural adhesive is coated on at least one side of the battery cell housing in the width direction, and the side of the battery cell housing coated with the structural adhesive abuts against the battery pack housing, such that the plurality of battery cells are arranged in the battery pack housing; or A plurality of battery cells as described in any one of claims 8 to 9 are provided, wherein structural adhesive is coated on at least one side of the battery cell housing along its length, and the side of the battery cell housing coated with the structural adhesive is abutted against the battery pack housing, such that the plurality of battery cells are arranged in the battery pack housing.

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