Battery cell film, battery, and vehicle

Abstract

The utility model provides a kind of electric core film, battery and vehicle, electric core film includes top film and bottom film, and is provided with adhesive through hole, adhesive through hole includes the top through hole in the electrode opposite direction non-centrally set in top film;And / or, adhesive through hole includes the bottom through hole in the electrode opposite direction non-centrally set in bottom film.Battery includes electric core body, top cover plate, bottom carrier plate and electric core film, electric core film cladding electric core body, and with electric core body form and be set between top cover plate and bottom carrier plate electric core unit, electric core body includes top surface and bottom surface arranged oppositely, top film and bottom film are attached to top surface and bottom surface respectively, adhesive through hole includes top through hole, part exposed in top through hole is adhered to top cover plate;And / or, adhesive through hole includes bottom through hole, part exposed in bottom through hole is adhered to bottom carrier plate.

Description

Technical Field

[0001] This utility model relates to the field of transportation technology, and in particular to a cell coating, a battery, and a vehicle. Background Technology

[0002] Existing power batteries consist of cells and a battery pack with a top cover and a bottom carrier plate. Multiple cells are arranged between the top cover and the bottom carrier plate, and each cell is covered with an insulating film. The insulating film has through-holes, and the area of ​​the cell exposed through the through-holes is bonded to the top cover and / or the bottom carrier plate by thermally conductive adhesive or structural bonding. The through-holes enable direct bonding between the cells and the battery pack, improve the stability of the cells, and reduce the modal characteristics of the power battery under impact and vibration conditions. However, they also reduce the insulation performance of the cells, increase the risk of creepage between the through-holes, and easily cause short circuits and fires in the cells. Utility Model Content

[0003] In view of this, the present invention provides a cell coating that can reduce the risk of creepage, and provides a safer and more reliable battery and vehicle.

[0004] The battery cell coating of this utility model includes a top film and a bottom film, and has an adhesive through hole. The adhesive through hole includes a top through hole opened in the top film, which is biased towards one end of the top film along the preset electrode facing direction; and / or, the adhesive through hole includes a bottom through hole opened in the bottom film, which is biased towards one end of the bottom film along the electrode facing direction.

[0005] The cell coating of this invention is used to coat the cell body and form a cell unit with it. The beneficial effects of this cell coating are as follows: when multiple cell units are arranged along the thickness direction of the cell body, and the polarity directions of any two adjacent cell bodies are opposite, the top through-hole is offset towards one end of the top film along the electrode facing direction, and / or the bottom through-hole is offset towards one end of the bottom film along the electrode facing direction. The bonding through-hole is not centrally located relative to the cell unit in the electrode facing direction. This creates a misalignment between the bonding through-holes of any two adjacent cell units in the electrode facing direction, increasing the creepage distance between any two adjacent cell units. This reduces the risk of creepage between cell bodies, improves the insulation performance of the cell body, and makes the cell body less prone to short circuits and fires.

[0006] In some embodiments, the bonding through-hole includes a top through-hole, and the number of top through-holes is multiple, with the multiple top through-holes arranged in a queue at intervals along the electrode opposing direction.

[0007] In some embodiments, the multiple top through-holes are divided into a first group of holes and a second group of holes, and the two ends of the top membrane are respectively a first membrane edge and a second membrane edge arranged opposite to each other along the electrode opposing direction, wherein:

[0008] The minimum distance between the first pore group and the second pore group is a1, the minimum distance between the first membrane edge and the top through-hole is a2, and the minimum distance between the second membrane edge and the top through-hole is a3, where a1 > a2 and a1 > a3; and / or,

[0009] The distance a from any point in the first pore group to the edge of the first membrane is... i None of them are equal to the distance 'a' from any one of the second pore groups to the edge of the second membrane. j .

[0010] In some embodiments, the bonding through-hole includes a bottom through-hole, and the number of bottom through-holes is multiple, with the multiple bottom through-holes arranged in a queue at intervals along the electrode opposing direction.

[0011] In some embodiments, the multiple bottom through-holes are divided into a third group and a fourth group, and the two ends of the bottom membrane are respectively a third membrane edge and a fourth membrane edge arranged opposite to each other along the electrode opposing direction, wherein:

[0012] The minimum distance between the third and fourth pore groups is b1, the minimum distance between the third membrane edge and the bottom through-hole is b2, and the minimum distance between the fourth membrane edge and the bottom through-hole is b3, where b1 > b2 and b1 > b3; and / or,

[0013] The distance b from any point in the third pore group to the edge of the third membrane m None of them are equal to the distance b from any one of the fourth pore groups to the edge of the fourth membrane. n .

[0014] In some implementations, both the top through hole and the bottom through hole are edge-closed through holes.

[0015] In some embodiments, the cell coating is an integral membrane structure, and also includes a first side membrane and a second side membrane arranged along a predetermined flat direction. The first side membrane is connected between the top membrane and the bottom membrane, and the second side membrane is connected to the top membrane or the bottom membrane.

[0016] In some embodiments, the second side membrane is connected to the bottom membrane, and the cell coating includes a fifth membrane edge and a sixth membrane edge arranged along a preset flat direction. The fifth membrane edge and the sixth membrane edge are located on the top membrane and the second side membrane, respectively, and both extend along the electrode opposing direction. The bonding through hole includes a top through hole, and the distance from the top through hole to the fifth membrane edge is greater than or equal to 2 mm.

[0017] The battery of this utility model includes a top cover plate, a bottom carrier plate, and a cell unit located between the top cover plate and the bottom carrier plate. The cell unit includes a cell body and the aforementioned cell coating film. The cell coating film covers the cell body. The cell body includes a top surface and a bottom surface disposed opposite to each other. The top film and the bottom film are respectively attached to the top surface and the bottom surface, wherein:

[0018] The adhesive through-hole includes a top through-hole, through which the portion of the top surface exposed is bonded to the top cover plate; and / or,

[0019] The bonding through-hole includes a bottom through-hole, through which the portion of the bottom surface exposed is bonded to the bottom carrier plate.

[0020] The battery of this invention is safer and more stable, reducing the risk of short circuit fires caused by creepage between battery cells, and inheriting the advantages of existing power batteries such as low-modality operation, strong bonding between battery cells and battery housing, and resistance to displacement of battery cells.

[0021] In some embodiments, the cell coating is an integral membrane structure, and also includes a first side membrane and a second side membrane arranged along a preset flat direction. The first side membrane is connected between the top membrane and the bottom membrane, and the second side membrane is connected to the bottom membrane. The cell body also includes a first side surface and a second side surface. The first side surface and the second side surface are arranged opposite to each other and located between the top surface and the bottom surface. The first side membrane and the second side membrane are respectively attached to the first side surface and the second side surface.

[0022] In some embodiments, the cell coating further includes an overlapping cover film connected to the second side film, the overlapping cover film being attached to the side of the top film facing away from the top surface and avoiding the top through-hole; and / or,

[0023] The distance from the center of the top through hole to the first side is less than or equal to the distance from the center of the top through hole to the second side.

[0024] In some embodiments, the cell body further includes a positive terminal portion and a negative terminal portion disposed opposite to each other along the electrode opposing direction, and the battery further includes a positive electrode tab and a negative electrode tab respectively disposed on the positive terminal portion and the negative terminal portion. The positive electrode tab and the negative electrode tab are of different heights in the cell height direction, and the cell height direction is perpendicular to the electrode opposing direction and the thickness direction of the cell body.

[0025] In some embodiments, the battery further includes a positive electrode cover plate and a negative electrode cover plate respectively covering the positive terminal portion and the negative terminal portion, with the positive electrode tab and the negative electrode tab respectively connected to the positive electrode cover plate and the negative electrode cover plate. The positive electrode cover plate and the negative electrode cover plate are asymmetrically arranged about a preset longitudinal midplane, which is located between the positive terminal portion and the negative terminal portion and is perpendicular to the electrode opposition direction.

[0026] The vehicle of this utility model includes the aforementioned battery.

[0027] The vehicle of this invention is safer and more reliable, its driving and handling performance can be guaranteed by lower battery modes, and the risk of battery fire and short circuit is lower. Attached Figure Description

[0028] Figure 1 This is a planar unfolded schematic diagram of the cell coating of Embodiment 1 of this utility model;

[0029] Figure 2 This is a top view of the cell coating of Embodiment 1 of this utility model in the state of covering the cell body;

[0030] Figure 3 for Figure 2 A partially enlarged schematic diagram of the cell coating shown;

[0031] Figure 4 This is a planar unfolded schematic diagram of the cell coating of Embodiment 2 of this utility model;

[0032] Figure 5 This is a top view of the cell coating of Embodiment 2 of this utility model in the state of covering the cell body;

[0033] Figure 6 This is a bottom view of the cell coating of this utility model in the state of covering the cell body;

[0034] Figure 7 This is a schematic diagram of the positive electrode cover and the negative electrode cover of the battery of this utility model;

[0035] Figure 8 This is a first exploded view of a battery cell unit according to one embodiment of the present invention.

[0036] Figure 9 This is a second exploded view of a battery cell unit according to one embodiment of the present invention.

[0037] Figure 10 This is a third exploded view of a battery cell unit according to one embodiment of the present invention.

[0038] Figure 11 This is a schematic diagram of the cell unit arrangement of a battery according to one embodiment of the present invention.

[0039] Figure 12 This is a top view showing the cell unit arrangement of a battery according to one embodiment of the present invention.

[0040] Explanation of reference numerals in the attached drawings: 100, cell coating; 10, top film; 11, first film edge; 12, second film edge; 13, fifth film edge; 20, first side film; 30, bottom film; 31, third film edge; 32, fourth film edge; 40, second side film; 41, sixth film edge; 50, overlapping cover film; 51, seventh film edge; 52, folded edge; 60, top through-hole; 61, first hole group; 62, second hole group; 70, bottom through-hole; 71, third hole group; 72, fourth hole group; 200, cell body; 210, top surface; 220, first side surface; 230, bottom surface; 240, second side surface; 250, positive electrode cover plate; 260, negative electrode cover plate; 300, cell unit. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] This utility model provides a cell coating 100 for covering a cell body 200. The cell coating 100 and the cell body 200 together form a cell unit 300 and provide insulation protection for the cell body 200. In addition, this utility model also provides a battery and a vehicle. The battery includes a housing and a cell unit 300 housed in the housing. The cell unit 300 includes a cell body 200 and a cell coating 100. The battery can be a power battery that provides power for the vehicle's range or a storage battery that provides power for electrical devices in the vehicle.

[0044] In some embodiments, the cell body 200 is a blade cell with a thin plate structure. The cell body 200 includes a top surface 210 and a bottom surface 230 arranged opposite to each other along the height direction of the cell, a first side surface 220 and a second side surface 240 arranged opposite to each other along the thickness direction of the cell body 200, and a positive terminal portion and a negative terminal portion arranged opposite to each other along the electrode opposing direction. The height direction of the cell, the thickness direction of the cell body 200 and the electrode opposing direction are perpendicular to each other.

[0045] Specifically, the top surface 210 and the bottom surface 230 are two parallel strip surfaces, the first side surface 220 and the second side surface 240 are two parallel rectangular planes, the positive end part and the negative end part are used to connect the positive electrode tab and the negative electrode tab respectively, and the electrode opposition direction is the spacing direction of the positive electrode tab and the negative electrode tab.

[0046] In other embodiments, the cell body 200 may be other types of cells that are not plate-shaped, and not limited to blade cells, such as cylindrical cells or prismatic cells.

[0047] See Figures 8-10In some embodiments, the cell coating 100 is an integral membrane structure wrapped around the outside of the cell body 200, including a top membrane 10, a first side membrane 20, a bottom membrane 30 and a second side membrane 40 connected as one piece. The top membrane 10 and the bottom membrane 30 are respectively covered on the top surface 210 and the bottom surface 230 of the cell body 200, and the first side membrane 20 and the second side membrane 40 are respectively covered on the first side surface 220 and the second side surface 240 of the cell body 200.

[0048] In the above embodiments, the cell coating 100 can be unfolded and laid flat in a film-laying plane, such as... Figure 1 and Figure 4 As shown, the top membrane 10, the first side membrane 20, the bottom membrane 30, and the second side membrane 40 are arranged along a preset flattening direction, which is parallel to the film-laying plane and perpendicular to the electrode facing direction. Figure 2 , Figure 4 The arrow K indicates the electrode orientation. Figures 1-6 , Figures 8-12 The arrow L is used to indicate this. It should be noted that in other embodiments, the cell coating 100 may also be a plurality of separate films, with the top film 10, the first side film 20, the bottom film 30 and the second side film 40 being formed separately.

[0049] See again Figures 1-6 , Figures 8-12 The cell coating 100 covers the blade cell and forms a cell unit 300 with the blade cell in a thin plate structure. The battery casing contains a cell module formed by arranging multiple cell units 300. The cell module is as follows: Figure 11 As shown, the housing includes a top cover plate and a bottom carrier plate spaced apart along the height direction of the battery cells. Multiple battery cell units 300 are sandwiched between the top cover plate and the bottom carrier plate. Figures 8-10 The arrow N indicates the number of cells. Multiple cell units 300 are arranged closely together along the thickness direction of the cell body 200. Figure 2 , Figures 5-6 , Figures 8-12 The arrow R is used to represent it.

[0050] It is worth noting that for all the cell units 300 arranged along the thickness direction of the cell body 200 in the battery casing, no two adjacent cell units 300 are obtained by translation along the thickness direction of the cell body 200. The polarity directions of the cell bodies 200 of any two adjacent cell units 300 are opposite. The polarity direction refers to the direction from the negative terminal to the positive terminal in the same cell body 200. It can be understood that the polarity direction is one of the two opposite directions of electrode opposition. Therefore, when multiple cell units 300 are arranged along the thickness direction of the cell body 200 and the polarity directions of any two adjacent cell units 300 are opposite, the positive and negative terminals of the multiple cell units 300 are as follows: Figure 11 The settings are alternately shown.

[0051] Specifically, one side of the top film 10 of each cell unit 300 is the top surface 210 of the cell body 200 of that cell unit 300, and the other side of the top film 10 of that cell unit 300 is a top cover plate; one side of the bottom film 30 of each cell unit 300 is the bottom surface 230 of the cell body 200 of that cell unit 300, and the other side of the bottom film 30 of that cell unit 300 is a bottom carrier plate. The top cover plate and the bottom carrier plate can be cold plates, which are used to cool down the cell unit 300. One side of the first side film 20 of each cell unit 300 is the first side surface 220 of the cell body 200 of the cell unit 300, and the other side of the first side film 20 of the cell unit 300 is the second side film 40 of the adjacent cell unit 300; one side of the second side film 40 of each cell unit 300 is the second side surface 240 of the cell body 200 of the cell unit 300, and the other side of the second side film 40 of the cell unit 300 is the first side film 20 of the adjacent cell unit 300.

[0052] Furthermore, the cell coating 100 of this utility model also has an adhesive through hole, which is used to expose a part of the surface of the cell body 200, so that the part of the cell body 200 exposed through the adhesive through hole can be directly bonded to the housing by thermally conductive adhesive or structural adhesive, thereby forming a firm and stable bonding point between the cell body 200 and the housing. This can improve the installation stability of the cell unit 300 in the housing, thereby improving the stability of the battery and reducing the battery's modal stress under impact and vibration conditions.

[0053] In some embodiments, the adhesive through-hole includes a top through-hole 60; in other embodiments, the adhesive through-hole includes a bottom through-hole 70; preferably, as shown below... Figures 1-6As shown, the bonding through-holes include a top through-hole 60 and a bottom through-hole 70. The top through-hole 60 is non-centeredly formed in the top membrane 10 in the electrode opposing direction, and is offset towards one end of the top membrane 10 along the electrode opposing direction. The bottom through-hole 70 is non-centeredly formed in the bottom membrane 30 in the electrode opposing direction, and is offset towards one end of the bottom membrane 30 along the electrode opposing direction. The portion of the top surface 210 of the cell body 200 exposed through the top through-hole 60 is bonded to the top cover plate with thermally conductive adhesive or structural adhesive. The portion of the bottom surface 230 of the cell body 200 exposed through the bottom through-hole 70 is bonded to the bottom carrier plate with thermally conductive adhesive or structural adhesive.

[0054] The aforementioned bonding through-holes are not centrally located in the top membrane 10 and / or bottom membrane 30. "Not centrally located" means that the bonding through-holes are asymmetrically located in the top membrane 10 and / or bottom membrane 30. When the top through-hole 60 is a single hole or a group of holes, the distribution position and range of the top through-hole 60 in the top membrane 10 are biased towards one end of the top membrane 10. When the bottom through-hole 70 is a single hole or a group of holes, the distribution position and range of the bottom through-hole 70 in the bottom membrane 30 are biased towards one end of the bottom membrane 30. The two ends of the top membrane 10 and the two ends of the bottom membrane 30 are both arranged opposite to each other along the electrode opposing direction. When the top through-hole 60 is a group of holes, the multiple groups of top through-holes 60 are asymmetrical with respect to the top symmetry center line of the top membrane 10. When the bottom through-hole 70 is a group of holes, the multiple groups of bottom through-holes 70 are asymmetrical with respect to the bottom symmetry center line of the bottom membrane 30.

[0055] Specifically, when the top membrane 10 has a top through-hole 60, refer to Figures 1-6 The top membrane 10 has two ends, namely a first membrane edge 11 and a second membrane edge 12, which are arranged opposite to each other along the electrode opposing direction. A top symmetry center line is drawn for the top membrane 10, which is perpendicular to the electrode opposing direction and parallel to the preset flat direction. The first membrane edge 11 and the second membrane edge 12 are located on both sides of the top symmetry center line, such that the distance from the first membrane edge 11 to the top symmetry center line is equal to the distance from the second membrane edge 12 to the top symmetry center line. Therefore, the opening shape of the top through hole 60 is not symmetrical about the top symmetry center line.

[0056] Specifically, when a bottom through hole 70 is provided on the bottom membrane 30, the two ends of the bottom membrane 30 are respectively a third membrane edge 31 and a fourth membrane edge 32 arranged opposite to each other along the electrode opposing direction. A bottom symmetry center line is drawn for the bottom membrane 30, which is perpendicular to the electrode opposing direction and parallel to the preset flat direction. The third membrane edge 31 and the fourth membrane edge 32 are respectively located on both sides of the bottom symmetry center line, so that the distance from the third membrane edge 31 to the bottom symmetry center line is equal to the distance from the fourth membrane edge 32 to the bottom symmetry center line. Then, the opening shape of the bottom through hole 70 is not symmetrical about the bottom symmetry center line.

[0057] With this configuration, the bonding through holes of any two adjacent cell units 300 are misaligned in the electrode opposing direction, forming a misalignment offset. That is, the bonding through holes of multiple cell units 300 are no longer arranged in a straight line along the thickness direction of the cell body 200. Figures 11-12 As shown, the top through-holes 60 of any two adjacent cell units 300 are misaligned with each other in the electrode-opposing direction indicated by arrow L. This misalignment increases the straight-line distance between the bonding through-holes of the two adjacent cell units 300, thereby increasing the creepage distance between the two adjacent cell bodies 200. This increases the difficulty of creepage between any two adjacent cell bodies 200. Therefore, compared with the existing cell coating 100 with bonding through-holes, the cell coating 100 of this invention can improve the insulation performance of the cell body 200, making the cell body 200 less prone to short-circuit fire accidents. Furthermore, the battery of this invention is safer and inherits the advantages of existing power batteries, such as low-modal operation and strong bonding between the cell unit 300 and the casing.

[0058] In some embodiments, there are multiple top through holes 60 and multiple bottom through holes 70. The multiple top through holes 60 are arranged in a queue with intervals along the electrode facing direction, and the multiple bottom through holes 70 are arranged in a queue with intervals along the electrode facing direction. Each top through hole 60 and each bottom through hole 70 is a round hole or an elliptical hole. Round holes and elliptical holes can reduce the risk of tearing and deformation at the edge of the hole of the cell coating 100.

[0059] With this configuration, multiple bonding points are formed between the cell body 200 and the top cover plate, and between the cell body 200 and the bottom carrier plate, arranged in a row at intervals along the electrode opposing direction, which significantly enhances the bonding strength and integrity between the cell body 200 and the battery box.

[0060] Optionally, such as Figures 1-6 As shown, the multiple top through-holes 60 are divided into a first hole group 61 and a second hole group 62, and the multiple bottom through-holes 70 are divided into a third hole group 71 and a fourth hole group 72. Each hole group is a queue of multiple adhesive through-holes arranged at intervals along the electrode opposing direction. The first hole group 61 is the one of the two hole groups of the top through-holes 60 that is relatively closer to the first membrane edge 11; the second hole group 62 is the one of the two hole groups of the top through-holes 60 that is relatively closer to the second membrane edge 12; the third hole group 71 is the one of the two hole groups of the bottom through-holes 70 that is relatively closer to the third membrane edge 31; and the fourth hole group 72 is the one of the two hole groups of the bottom through-holes 70 that is relatively closer to the fourth membrane edge 32. The multiple adhesive through-holes in each hole group can be evenly or unevenly arranged.

[0061] Preferably, the minimum distance between the first hole group 61 and the second hole group 62 is a1, the minimum distance between the first membrane edge 11 and the top through hole 60 is a2, and the minimum distance between the second membrane edge 12 and the top through hole 60 is a3, where a1 > a2 and a1 > a3, and a2 ≠ a3; the minimum distance between the third hole group 71 and the fourth hole group 72 is b1, the minimum distance between the third membrane edge 31 and the bottom through hole 70 is b2, and the minimum distance between the fourth membrane edge 32 and the bottom through hole 70 is b3, where b1 > b2 and b1 > b3, and b2 ≠ b3. a2 is the distance from the first membrane edge 11 to the nearest bonding through hole in the first hole group 61, and a3 is the distance from the second membrane edge 12 to the nearest bonding through hole in the second hole group 62.

[0062] With this configuration, the two groups of holes in the top through-hole 60 generally exhibit an arrangement pattern that is closer to the first membrane edge 11 and the second membrane edge 12, and the two groups of holes are more distant from each other. Similarly, the two groups of holes in the bottom through-hole 70 generally exhibit an arrangement pattern that is closer to the third membrane edge 31 and the fourth membrane edge 32, and the two groups of holes are more distant from each other. The portion of each cell body 200 near its positive and negative terminals achieves a more reliable positioning effect, ensuring that multiple cell bodies 200 are stably connected in series with each other.

[0063] Furthermore, the first hole group 61 of each cell unit 300 and the second hole group 62 of the adjacent cell unit 300 are staggered in the electrode facing direction, the second hole group 62 of each cell unit 300 and the first hole group 61 of the adjacent cell unit 300 are staggered in the electrode facing direction, the third hole group 71 of each cell unit 300 and the fourth hole group 72 of the adjacent cell unit 300 are staggered in the electrode facing direction, and the fourth hole group 72 of each cell unit 300 and the third hole group 71 of the adjacent cell unit 300 are staggered in the electrode facing direction. Therefore, creepage is unlikely to occur between any two adjacent cell units 300.

[0064] Furthermore, let a be the distance from any bonding through-hole in the first hole group 61 to the edge 11 of the first membrane. i The distance from any bonding through-hole in the second pore group 62 to the edge 12 of the second membrane is denoted as a. j Then a i ≠a j If the distance from any bonding through-hole in the third pore group 71 to the edge 31 of the third membrane is denoted as b... m The distance from any bonding through-hole in the fourth pore group 72 to the edge 32 of the fourth membrane is denoted as b. n Then b m ≠b nLet i represent the sequence number of the bonding through hole in the first hole group 61, j represent the sequence number of the bonding through hole in the second hole group 62, m represent the sequence number of the bonding through hole in the third hole group 71, and n represent the sequence number of the bonding through hole in the fourth hole group 72. The first hole group 61 and the second hole group 62 may have equal or unequal numbers of bonding through holes, and the third hole group 71 and the fourth hole group 72 may have equal or unequal numbers of bonding through holes. Optionally, the number of bonding through holes in the first hole group 61 and the second hole group 62 may be 2 to 6, and the number of bonding through holes in the third hole group 71 and the fourth hole group 72 may be 2 to 6, where 2≤i≤6; 2≤j≤6; 2≤m≤6; and 2≤n≤6.

[0065] With this configuration, for any two adjacent battery cell units 300, it can be ensured that any top through-hole 60 of one battery cell unit 300 can be offset from any top through-hole 60 of the other battery cell unit 300 along the electrode facing direction. It can also be ensured that any bottom through-hole 70 of one battery cell unit 300 can be offset from any bottom through-hole 70 of the other battery cell unit 300 along the electrode facing direction. Ultimately, the situation where the bonding through-holes located in the two battery cell units 300 are arranged along the thickness direction of the battery cell body 200 is completely eliminated, thus completely eliminating the risk of creepage.

[0066] Furthermore, such as Figures 1-6 As shown, both the top through-hole 60 and the bottom through-hole 70 are edge-closed through-holes. When the cell coating 100 is unfolded within the film-laying plane, all the top through-holes 60 and all the bottom through-holes 70 are located within the edge of the cell coating 100, and no adhesive through-hole penetrates the edge of the cell coating 100. This design makes the cell coating 100 less prone to tearing, overcoming the problem of cracks expanding from the adhesive through-hole when it penetrates the edge of the cell coating 100. The shape of the adhesive through-hole is more stable, preventing an increase in the exposed area of ​​the cell body 200 due to the enlargement of the adhesive through-hole, and reducing the risk of short-circuit creepage.

[0067] Specifically, the cutting and forming process of the cell coating 100 is as follows: First, a whole piece of coating substrate is selected, then holes are punched in a designated area on the coating substrate to obtain adhesive through holes, then an area is selected on the coating substrate, the boundary of the area is a closed boundary, all adhesive through holes are located inside the closed boundary, and finally the coating substrate is cut along the closed boundary. The coating substrate within the closed boundary range forms the cell coating 100, and the closed boundary forms the edge of the cell coating 100.

[0068] See Figure 1 and Figure 4As an integrated membrane, the cell coating 100 comprises a top membrane 10, a first side membrane 20, a bottom membrane 30, and a second side membrane 40, which are sequentially connected along a predetermined flat direction. The dashed line S1 represents the boundary and connection point between the top membrane 10 and the first side membrane 20; the dashed line S2 represents the boundary and connection point between the first side membrane 20 and the bottom membrane 30; and the dashed line S3 represents the boundary and connection point between the bottom membrane 30 and the second side membrane 40. After the dashed line S1 is bent on both sides, it forms an edge corresponding to the intersection line between the top surface 210 and the first side surface 220. After the dashed line S2 is bent on both sides, it forms an edge corresponding to the intersection line between the first side surface 220 and the bottom surface 230. After the dashed line S3 is bent on both sides, it forms an edge corresponding to the intersection line between the bottom surface 230 and the second side surface 240.

[0069] See Figure 1 and Figure 2 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the cell coating 100, which is an integral membrane, also includes an overlapping cover film 50 connected to the second side membrane 40. The dashed line S4 indicates the boundary line and connection position between the second side membrane 40 and the overlapping cover film 50. After the dashed line S4 is bent on both sides, it forms an edge corresponding to the intersection line between the second side membrane 240 and the top surface 210. After the cell coating 100 wraps the cell body 200 once through the top membrane 10, the first side membrane 20, the bottom membrane 30, and the second side membrane 40, the overlapping cover film 50 is attached to the side of the top membrane 10 facing away from the top surface 210. Therefore, the overlapping cover film 50, the top membrane 10, the top surface 210, and the bottom surface 230 are arranged sequentially along the height direction of the cell. This arrangement makes the cell coating 100 more firmly and reliably cover the cell body 200. The top cover and the bottom surface 230 can press the overlapping cover film 50 and the top membrane 10 tightly to prevent the top membrane 10 from lifting.

[0070] Furthermore, such as Figure 1 and Figure 4 As shown, the cell coating 100 includes a fifth film edge 13, which is formed on the side of the top film 10 that is relatively far from the second side film 40 and extends along the electrode opposing direction. The fifth film edge 13 is formed by a closed boundary during the aforementioned cutting and forming process of the cell coating 100. When the top film 10 is applied to the top surface 210 of the cell body 200, the fifth film edge 13 is located on the top surface 210 of the cell body 200, and the distance from the top through-hole 60 to the fifth film edge 13 is greater than or equal to 2 mm. Figure 2 As shown, preferably, the fifth membrane edge 13 is located at the intersection of the top surface 210 and the second side surface 240, that is, the fifth membrane edge 13 extends along the edge between the top surface 210 and the second side surface 240, and the distance from the first hole group 61 to the fifth membrane edge 13 and the distance from the second hole group 62 to the fifth membrane edge 13 are within the range of... Figure 2 and Figure 5 The dimension H is used to represent it.

[0071] With this configuration, when cutting the coated substrate to obtain the cell coating 100, there is a distance greater than or equal to 2 mm between the fifth film edge 13 and the top through hole 60 formed before cutting the coated substrate. This distance can prevent the coated substrate from undergoing excessive stretching or shearing deformation during the cutting process. There is enough film material between the fifth film edge 13 and the top through hole 60 to overcome the tension force exerted on the coated substrate by the cutting tool, thereby maintaining the shape and size of the top through hole 60. After the fifth film edge 13 is cut, the shape of the top through hole 60 can still maintain the shape and size before cutting the fifth film edge 13, avoiding the expansion of the top through hole 60.

[0072] Further, see again Figure 1 The cell coating 100 also includes a seventh film edge 51, which is formed on the side of the overlapping cover film 50 that is relatively far from the second side film 40 and extends along the electrode opposing direction. The seventh film edge 51 is formed by the closed boundary during the cutting and forming process of the aforementioned cell coating 100. The fifth film edge 13 and the seventh film edge 51 are two opposite sides of the closed boundary that are spaced apart along a predetermined flat direction. After the cell coating 100 wraps the cell body 200 once, the seventh film edge 51 is located on the side of the top film 10 that is away from the top surface 210, while the first film edge 11 avoids all the top through holes 60, that is, all the top through holes 60 are not covered by the overlapping cover film 50.

[0073] Preferably, such as Figure 2 and Figure 3 As shown, the dimension of the overlapping cover film 50 in the preset flat direction is the width of the overlapping cover film 50, which is less than 2 mm. The dashed line S4 forms a folded edge 52, which extends along the edge between the top surface 210 and the second side surface 240. This arrangement ensures that the overlapping cover film 50 completely avoids the top through-hole 60, and the seventh film edge 51 is located between the top through-hole 60 and the folded edge 52, preventing the effective bonding area between the top surface 210 and the top cover plate from being reduced due to the overlapping cover film 50 covering the top through-hole 60.

[0074] Further, see Figures 1-2 , Figures 3-4 To ensure that all top through-holes 60 are not covered by the overlapping cover film 50, the distance F from the center of the top through-hole 60 to the crease S1 is greater than 1 mm and less than or equal to half the thickness of the cell body 200. The distance from the center of the top through-hole 60 to the crease S1 is less than the distance from the center of the top through-hole 60 to the fifth film edge 13. The top through-holes 60 are not centered in the thickness direction of the cell body 200 and are offset towards the crease S1. With this configuration, all top through-holes 60 are located on the top surface 210 of the cell body 200 and will not be offset to the first side surface 220.

[0075] In other embodiments, see Figure 4 and Figure 5 In the integrated membrane cell coating 100, the overlapping cover film 50 is eliminated. After the cell coating 100 wraps the cell body 200 around once, the top film 10 and the top surface 210 are bonded together and their edges correspond one-to-one. The first side film 20 and the first side surface 220 are bonded together and their edges correspond one-to-one. The bottom film 30 and the bottom surface 230 are bonded together and their edges correspond one-to-one. The second side film 40 and the second side surface 240 are bonded together and their edges correspond one-to-one. The cell coating 100 also includes a sixth film edge 41, which is formed on the side of the second side film 40 that is relatively far from the bottom film 30 and extends along the electrode opposing direction. The sixth film edge 41 is formed by the closed boundary during the cutting and forming process of the aforementioned cell coating 100. After the cell coating 100 wraps the cell body 200 around once, a film edge seam is formed between the fifth film edge 13 and the sixth film edge 41. The film edge seam is located at the intersection line between the top surface 210 and the second side surface 240, that is, the film edge seam extends along the edge between the top surface 210 and the second side surface 240.

[0076] It should be noted that in the embodiment where the cell coating 100 is an integral membrane structure, the top membrane 10, the first side membrane 20, the bottom membrane 30, and the second side membrane 40 are arranged sequentially along a preset flat direction and connected in pairs, and the cell coating 100 wraps around the cell body 200 to form a cell unit 300 with the cell body 200, the bottom through hole 70 can be centrally opened in the bottom membrane 30 in the thickness direction of the cell body 200, in which case the distance from the bottom through hole 70 to the first side membrane 20 is equal to the distance from the bottom through hole 70 to the second side membrane 40, or it can be non-centrally opened in the bottom membrane 30 in the thickness direction of the cell body 200, in which case the distance from the bottom through hole 70 to the first side membrane 20 is greater than or less than the distance from the bottom through hole 70 to the second side membrane 40.

[0077] for Figure 1 and Figure 4The cell coating 100 shown has a first side film 20 connected between the top film 10 and the bottom film 30, and a second side film 40 connected to the bottom film 30. In some other embodiments not shown in the figure, the first side film 20 is connected between the top film 10 and the bottom film 30, while the second side film 40 is connected to the top film 10. In addition, the cell coating 100 may include or omit an overlapping cover film 50, which is connected to the second side film 40. After the cell coating 100 is wrapped around the cell body 200 once, the overlapping cover film 50 is attached to the side of the bottom film 30 facing away from the bottom surface 230. As long as the first side film 20 and the second side film 40 can completely cover the first side 220 and the second side 240, and the cell coating 100 avoids forming a splicing gap at the first side 220 or the second side 240, it is acceptable.

[0078] In some embodiments, the battery further includes a positive electrode tab and a negative electrode tab respectively disposed on the positive and negative terminals, the positive and negative electrode tabs being at unequal heights along the cell height direction. See also Figure 7 See also Figures 8-11 The battery also includes a positive electrode cover plate 250 and a negative electrode cover plate 260 respectively covering the positive terminal and the negative terminal. The positive electrode cover plate 250 is provided with a first electrode tab mounting position for connecting the positive electrode tab, and the negative electrode cover plate 260 is provided with a second electrode tab mounting position for connecting the negative electrode tab. The first electrode tab mounting position and the second electrode tab mounting position are offset in the cell height direction.

[0079] The positive electrode tab and the first electrode tab mounting position are welded, fastened, or spliced ​​together; the negative electrode tab and the second electrode tab mounting positions are welded, fastened, or spliced ​​together. Optionally, in the cell height direction, the first electrode tab mounting position is not centrally located on the positive electrode cover plate 250, and the second electrode tab mounting position is also not centrally located on the negative electrode cover plate 260 in the cell height direction. Specifically, the first electrode tab mounting position is biased towards the end of the positive electrode cover plate 250 closest to the top membrane 10 in the cell height direction, and the second electrode tab mounting position is biased towards the end of the negative electrode cover plate 260 closest to the bottom membrane 30; or, the first electrode tab mounting position is biased towards the end of the positive electrode cover plate 250 closest to the bottom membrane 30 in the cell height direction, and the second electrode tab mounting position is biased towards the end of the negative electrode cover plate 260 closest to the top membrane 10.

[0080] With this configuration, the tabs of any two adjacent cell units 300 are misaligned in the cell height direction and form a misalignment offset. That is, the tabs of multiple cell units 300 are no longer arranged in a straight line along the thickness direction of the cell body 200. The misalignment offset increases the distance between the tabs of two adjacent cell units 300, thereby reducing the possibility of creepage short circuit between the tabs of two cell bodies 200.

[0081] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. A cell coating (100), characterized in that, Includes a top membrane (10) and a bottom membrane (30), and has adhesive through holes, wherein: The adhesive through hole includes a top through hole (60) formed in the top membrane (10), and the top through hole (60) is biased towards one end of the top membrane (10) along the preset electrode opposing direction; and / or, The bonding through hole includes a bottom through hole (70) formed in the bottom membrane (30), and the bottom through hole (70) is biased towards one end of the bottom membrane (30) along the electrode opposing direction.

2. The cell coating (100) as described in claim 1, characterized in that, The bonding through hole includes the top through hole (60), and there are multiple top through holes (60), which are arranged in a queue at intervals along the electrode opposing direction.

3. The cell coating (100) as described in claim 2, characterized in that, The plurality of top through holes (60) are divided into a first hole group (61) and a second hole group (62). The two ends of the top membrane (10) are respectively a first membrane edge (11) and a second membrane edge (12) arranged opposite to each other along the electrode opposing direction, wherein: The minimum distance between the first group of holes (61) and the second group of holes (62) is a1, the minimum distance between the first membrane edge (11) and the top through hole (60) is a2, and the minimum distance between the second membrane edge (12) and the top through hole (60) is a3, where a1 > a2 and a1 > a3; and / or, The distance a from any one of the first pores (61) to the edge of the first membrane (11) i None of them are equal to the distance a from any one of the second pore groups (62) to the edge of the second membrane (12). j .

4. The cell coating (100) as described in claim 1, characterized in that, The bonding through hole includes the bottom through hole (70), and there are multiple bottom through holes (70), which are arranged in a row at intervals along the electrode opposing direction.

5. The cell coating (100) as described in claim 4, characterized in that, The plurality of bottom through holes (70) are divided into a third hole group (71) and a fourth hole group (72). The two ends of the bottom membrane (30) are respectively the third membrane edge (31) and the fourth membrane edge (32) arranged opposite to each other along the electrode opposing direction, wherein: The minimum distance between the third pore group (71) and the fourth pore group (72) is b1, the minimum distance between the third membrane edge (31) and the bottom through hole (70) is b2, and the minimum distance between the fourth membrane edge (32) and the bottom through hole (70) is b3, where b1 > b2 and b1 > b3; and / or, The distance b from any one of the third pores (71) to the edge of the third membrane (31) m None of them are equal to the distance b from any one of the fourth pore groups (72) to the edge of the fourth membrane (32). n .

6. The cell coating (100) as described in any one of claims 1 to 5, characterized in that, Both the top through hole (60) and the bottom through hole (70) are edge-closed through holes.

7. The cell coating (100) as described in claim 6, characterized in that, The cell coating (100) is an integral membrane structure and also includes a first side membrane (20) and a second side membrane (40). The first side membrane (20) is connected between the top membrane (10) and the bottom membrane (30), and the second side membrane (40) is connected to the top membrane (10) or the bottom membrane (30).

8. The cell coating (100) as described in claim 7, characterized in that, The second side film (40) is connected to the bottom film (30), and the cell coating (100) includes a fifth film edge (13), which is formed on the side of the top film (10) that is relatively away from the second side film (40) and extends along the electrode opposing direction; the bonding through hole includes the top through hole (60), and the distance from the top through hole (60) to the fifth film edge (13) is greater than or equal to 2 mm.

9. A battery, characterized in that, Includes a top cover plate, a bottom carrier plate, and a cell unit (300) located between the top cover plate and the bottom carrier plate. The battery cell unit (300) includes a battery cell body (200) and a battery cell coating (100) as described in any one of claims 1 to 8, wherein the battery cell coating (100) covers the battery cell body (200). The battery cell body (200) includes a top surface (210) and a bottom surface (230) disposed opposite to each other. The top film (10) and the bottom film (30) are respectively attached to the top surface (210) and the bottom surface (230), wherein: The adhesive through-hole includes the top through-hole (60), and the portion of the top surface (210) exposed through the top through-hole (60) is bonded to the top cover plate; and / or, The adhesive through hole includes the bottom through hole (70), and the portion of the bottom surface (230) exposed through the bottom through hole (70) is bonded to the bottom carrier plate.

10. The battery as claimed in claim 9, characterized in that, The cell coating (100) is an integral membrane structure, and also includes a first side membrane (20) and a second side membrane (40). The first side membrane (20) is connected between the top membrane (10) and the bottom membrane (30) and is attached to the first side (220) of the cell body (200). The second side membrane (40) is connected to the bottom membrane (30) and is attached to the second side (240) of the cell body (200).

11. The battery as claimed in claim 10, characterized in that, The cell coating (100) further includes an overlapping cover film (50) connected to the second side film (40), the overlapping cover film (50) being attached to the side of the top film (10) facing away from the top surface (210) and avoiding the top through-hole (60); and / or, The distance from the center of the top through hole (60) to the first side (220) is less than or equal to the distance from the center of the top through hole (60) to the second side (240).

12. The battery as claimed in claim 9, characterized in that, The cell body (200) further includes a positive terminal portion and a negative terminal portion disposed opposite to each other along the electrode opposing direction. The battery also includes a positive electrode tab and a negative electrode tab respectively disposed on the positive terminal portion and the negative terminal portion. The positive electrode tab and the negative electrode tab are not at the same height in the cell height direction. The cell height direction is perpendicular to the electrode opposing direction and the thickness direction of the cell body (200).

13. A vehicle, characterized in that, Includes the battery as described in any one of claims 9 to 12.

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