Battery cell, battery module and battery pack

Abstract

The utility model provides a battery cell, a battery module and a battery pack, the battery cell comprises: a shell having a first side surface, the size of the first side surface perpendicular to the height direction of the shell being defined as the width Dmm of the first side surface; the insulating film wraps the outer side of the shell, a first hollowed-out area is formed in the part, arranged on the first side face, of the insulating film, the part, exposed out of the first hollowed-out area, of the shell is used for being directly connected with the insulating connecting piece, and the area of the first hollowed-out area ranges from 2.5 Dmm < 2 > to 13.5 Dmm < 2 >. According to the battery cell, the battery module and the battery pack provided by the invention, on the basis of ensuring that the battery cell can be reliably connected with the insulating connecting piece, the problem of insulation failure of the battery cell caused by large-area exposure of the shell through the first hollow area can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and in particular to a battery cell, a battery module and a battery pack. BACKGROUND

[0002] In order to meet the good insulation performance in the battery module, the square shell battery cell usually has an insulating film (or called blue film) attached to the outside of the shell.

[0003] In the battery module including the square shell battery cell, it is necessary to bond an insulating connector for fixing the battery cell to the side wall of the battery cell. When the insulating connector is bonded to the insulating film on the battery cell, the connection strength between the insulating connector and the insulating film is low, which causes the structural strength of the battery module to be unable to meet the test requirements when the battery module is subjected to vibration impact related tests. At the same time, due to the low strength of the insulating film itself, after being subjected to vibration impact, the insulating film has a risk of being separated from the shell, which also causes the battery module to be unable to meet the test requirements. SUMMARY

[0004] Therefore, the present application aims to provide a battery cell, a battery module and a battery pack to at least partially solve the problem of low connection strength between the insulating connector and the battery cell with the insulating film attached thereto.

[0005] To achieve the above object, the present application provides a battery cell in a first aspect, comprising: a shell having a first side face, wherein the dimension of the first side face perpendicular to the height direction of the shell defines the width Dmm of the first side face; and an insulating film attached to the outside of the shell, wherein the part of the insulating film arranged on the first side face is formed with a first hollow area, and the part of the shell exposed through the first hollow area is used for direct connection with the insulating connector, and the area of the first hollow area is 2.5Dmm 2 to 13.5Dmm 2 .

[0006] Optionally, 2mm≤Dmm≤8mm.

[0007] Optionally, 2.8mm≤Dmm≤3.2mm.

[0008] Optionally, the area of the first hollow area is 2.5Dmm 2 , 4.5Dmm 2 , 7.5Dmm 2 or 13.5Dmm 2 .

[0009] Optionally, in the direction perpendicular to the first side face, the first hollow area is a rectangle in the orthographic projection of the shell, the dimension of the rectangle along the height direction of the shell defines the length of the rectangle, and the ratio of the width to the length of the rectangle is 0.3 to 3.

[0010] Optionally, the length of the rectangle is 5mm to 15mm.

[0011] Optionally, the width of the rectangle is 0.5Dmm to 0.9Dmm.

[0012] Optionally, the width of the rectangle is greater than the length of the rectangle.

[0013] Optionally, the first hollowed-out area extends to the top and / or bottom of the first side in the height direction of the shell.

[0014] Optionally, the top of the shell is connected with a cover plate assembly, and the edge of the first hollowed-out area coincides with the top edge of the first side.

[0015] Based on the same inventive concept, the second aspect of the present application further provides a battery module comprising the battery cell as described in the first aspect.

[0016] Optionally, the battery module comprises an insulating connecting piece, and the insulating connecting piece is bonded to the part of the shell exposed through the first hollowed-out area.

[0017] Optionally, in the direction perpendicular to the first side, the orthographic projection of the first hollowed-out area on the first side is located inside the orthographic projection of the insulating connecting piece on the first side.

[0018] Optionally, the battery module comprises at least two battery cells, the stacking direction of the at least two battery cells is perpendicular to the height direction of the shell, the first side of each of the at least two battery cells is located on the same side, and the at least two battery cells are connected to the same insulating connecting piece.

[0019] Based on the same inventive concept, the third aspect of the present application further provides a battery pack comprising the battery module as described in the second aspect.

[0020] As can be seen from the above, the battery cell, the battery module and the battery pack provided by the present application have the following advantages. The first hollowed-out area is arranged on the insulating film of the first side of the cladding shell, which can make the insulating connecting piece directly connected to the surface of the shell through the first hollowed-out area when the battery cell is connected to the insulating connecting piece, thereby helping to improve the connection strength of the battery cell and the insulating connecting piece. At the same time, according to the width Dmm of the first side, the area of the first hollowed-out area is limited to 2.5Dmm 2 to 13.5Dmm 2 , which can ensure that the battery cell can be reliably connected to the insulating connecting piece, and can also avoid the problem of insulation failure of the battery cell due to the large-area exposure of the shell through the first hollowed-out area. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 A perspective view of the battery cell of the embodiment of the application is shown in FIG. 1.

[0023] Figure 2 A partial view of the battery module of the embodiment of the application is shown in FIG. 2.

[0024] Figure 3 A random vibration simulation diagram of the battery pack of the embodiment of the application with the first-order Z-direction main frequency of 87.5 Hz is shown in FIG. 3.

[0025] Figure 4 A side view of the battery cell of the embodiment of the application is shown in FIG. 4.

[0026] Legend of reference signs:

[0027] 100, housing; 110, first side; 120, top;

[0028] 200, insulating film; 210, first hollowed-out area;

[0029] 300, insulating connecting piece;

[0030] 400, cover plate assembly. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be further described in detail below with reference to the specific embodiments and the drawings.

[0032] It should be noted that: unless otherwise specified, the relative arrangement, numerical expression and numerical value of the components set forth in these embodiments do not limit the scope of the application.

[0033] At the same time, it should be understood that, in order to facilitate the description, the size of each part shown in the drawings is not drawn according to the actual proportional relationship.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting on the application or its application or uses.

[0035] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] The applicant's research found that the connection strength achieved by directly bonding the insulating connector 300 to the cell casing 100 is greater than the connection strength achieved by bonding the insulating connector 300 to the insulating film 200. In other words, in the battery module, directly connecting the insulating connector 300 to the casing 100 allows the structural strength of the battery module to meet the vibration and shock test requirements.

[0037] Understandably, the larger the bonding area between the insulating connector 300 and the housing 100, the higher the connection strength that can be achieved between them. However, if a large area of ​​the housing 100 of the battery cell is exposed in order to facilitate bonding with the insulating connector 300, it may lead to the risk of insulation failure of the battery cell.

[0038] To address the aforementioned issues, embodiments of this application provide battery cells. Figure 1 A 3D schematic diagram of the battery cell was displayed. Figure 2 A partial schematic diagram of the battery module is shown. (For example...) Figure 1 and Figure 2 The battery cell includes: a housing 100 having a first side surface 110, wherein the first side surface 110 is perpendicular to the height direction of the housing 100 (e.g., ...). Figure 2 The dimension perpendicular to the Z direction (i.e., the dimension along the first side 110) Figure 2 The dimension in the X direction is defined as the width Dmm of the first side surface 110; the insulating film 200 covers the outside of the housing 100, and the portion of the insulating film 200 disposed on the first side surface 110 forms a first hollow area 210. The portion of the housing 100 exposed through the first hollow area 210 is used for direct connection with the insulating connector 300. The area of ​​the first hollow area 210 is 2.5Dmm. 2 Up to 13.5Dmm 2 .

[0039] Exemplarily, the insulating connecting member 300 can be a tape, a bandage coated with adhesive, or a rigid structure coated with adhesive, etc.

[0040] Exemplarily, the shell 100 has two narrow sides (i.e., the sides with smaller surface area in the square shell cell) distributed along the length direction (i.e., the Y direction in Figure 1

[0041] Exemplarily, the shell 100 also has a bottom side, and two wide sides (i.e., the sides with larger surface area in the square shell cell) distributed along the thickness direction (i.e., the X direction in Figure 1

[0042] Exemplarily, the top 120 of the shell 100 is also provided with an opening, and the cell includes a cover plate assembly 400 covering the opening.

[0043] Exemplarily, the insulating connecting member 300 and the shell 100 can be directly connected by adhesion or hot melt connection, etc.

[0044] Exemplarily, the area of the first hollowed-out area 210 can be 2.5D mm 2 , 3D mm 2 , 3.5D mm 2 , 4D mm 2 , 4.5D mm 2 , 5D mm 2 , 5.5D mm 2 , 6D mm 2 , 6.5D mm 2 , 7D mm 2 , 7.5D mm 2 , 8D mm 2 , 8.5D mm 2 , 9D mm 2 , 9.5D mm 2 , 10D mm 2 , 10.5D mm 2 , 11D mm 2 , 11.5D mm 2 , 12D mm 2 , 12.5D mm 2 , 13D mm 2 , or 13.5D mm 2 .

[0045] Exemplarily, the shell 100 can be a metal shell, such as an aluminum shell.

[0046] ​​Exemplarily, the orthographic projection of the first hollowed-out area 210 on the shell 100 can be circular, semicircular, polygonal, or irregular.

[0047] When the battery cell of the present embodiment is connected with the insulating connector 300, a part of the insulating connector 300 is connected with the outer surface (i.e., the surface away from the shell 100) of the insulating film 200 covering the first side surface 110, and another part of the insulating connector 300 is connected directly with the surface of the shell 100 through the first hollowed-out area 210 and the insulating film 200. In combination with the foregoing, it can be known that the direct connection of the insulating connector 300 and the shell 100 can achieve a higher connection strength, and thus it can be ensured that the insulating connector 300 can achieve reliable connection with the battery cell.

[0048] On this basis, the present embodiment further limits the area of the first hollowed-out area 210 to 2.5Dmm 2 to 13.5Dmm 2 , according to the width Dmm of the first side surface 110, so as to avoid that the area of the first hollowed-out area 210 is too small, the connection area of the insulating connector 300 and the shell 100 is too small, and thus the connection strength of the insulating connector 300 and the battery cell is generally low.

[0049] Specifically, Table 1 is the test analysis result obtained by the applicant through random vibration test on the battery pack assembled after the battery cell with the area of the first hollowed-out area 210 being 110mm 2 .

[0050] Table 1

[0051]

[0052] As can be seen from Table 1, after the battery pack is subjected to vibration of 0.388MPa in the X direction (i.e., the stacking direction of the battery cell in the battery pack, that is, the thickness direction of the shell 100), 0.417MPa in the Y direction (i.e., the length direction of the shell 100), and 1.023MPa in the Z direction (i.e., the height direction of the shell 100), the insulating connector 300 can still maintain reliable connection with the battery cell, meeting the test requirements of the vibration impact test.

[0053] In combination with Figure 3 , Figure 3 , the simulation diagram of the random vibration of the battery pack with the first-order Z direction main frequency of 87.5Hz is shown. The first side surface 110 and the insulating connector 300 are located on one side of the battery pack in the X direction, and it can be seen that no large deformation occurs at this position. That is, it is proved that the insulating connector 300 can maintain reliable connection with the battery cell, meeting the test requirements of the vibration impact test.

[0054] Meanwhile, the area of the first hollowed-out area 210 is limited within the above range, and the first hollowed-out area 210 can be easily covered by the insulation connecting piece 300, so as to ensure the insulation performance of the battery cell. Avoiding the area of the first hollowed-out area 210 being too large, so that after the insulation connecting piece 300 is connected with the battery cell, a larger area of the shell 100 is still exposed through the first hollowed-out area 210.

[0055] The battery cell provided by the embodiment can set the first hollowed-out area 210 on the insulation film 200 of the first side surface 110 of the shell 100, so that when the battery cell is connected with the insulation connecting piece 300, the insulation connecting piece 300 is directly connected with the surface of the shell 100 through the first hollowed-out area 210, thereby helping to improve the connection strength of the battery cell and the insulation connecting piece 300. Meanwhile, according to the width Dmm of the first side surface 110, the area of the first hollowed-out area 210 is limited to 2.5Dmm 2 to 13.5Dmm 2 On the basis of ensuring that the battery cell can be reliably connected with the insulation connecting piece 300, the problem of insulation failure of the battery cell caused by the large-area exposure of the shell 100 through the first hollowed-out area 210 can also be avoided.

[0056] In some embodiments, 2mm≤Dmm≤8mm.

[0057] For example, Dmm can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm.

[0058] For the first side surface 110 with too large width, if the area of the first hollowed-out area 210 is still limited to 2.5Dmm 2 to 13.5Dmm 2 , the area of the first hollowed-out area 210 can be too large, and the battery cell can still have the problem of insulation failure if the size of the insulation connecting piece 300 is small. For the first side surface 110 with too small width, even if the area of the first hollowed-out area 210 is limited to 2.5Dmm 2 to 13.5Dmm 2 , the actual area of the shell 100 exposed through the first hollowed-out area 210 is very small, and it is also difficult to more obviously improve the connection strength of the battery cell and the insulation connecting piece 300.

[0059] In order to avoid the above problems, the embodiment limits Dmm to 2mm to 8mm, which can not only ensure that the area of the shell 100 exposed through the first hollowed-out area 210 is sufficient to form a more reliable connection structure between the battery cell and the insulation connecting piece 300, but also further reduce the risk of insulation failure of the battery cell.

[0060] In some embodiments, 2.8mm≤Dmm≤3.2mm.

[0061] Exemplarily, Dmm can be 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, or 3.2 mm.

[0062] To further prevent the problems of insufficient connection strength between the battery cell and the insulating connector 300 or insulation failure of the battery cell, the present embodiment limits Dmm to 2.8 mm to 3.2 mm, so as to further ensure that the battery cell and the insulating connector 300 can form a reliable connection structure after the insulating connector 300 is directly connected with the shell 100 exposed through the first hollow area 210, and prevent the problem of insulation failure of the battery cell.

[0063] In some embodiments, the area of the first hollow area 210 is 2.5Dmm 2 , 4.5Dmm 2 , 7.5Dmm 2 , or 13.5Dmm 2 .

[0064] The applicant found that there are many size specifications of the first side surface 110 of the square shell battery cell, but the area size of the first hollow area 210 does not need to be too strict, as long as the first hollow area 210 meets the functional requirements, that is, to ensure that the part of the shell 100 exposed through the first hollow area 210 can be reliably connected with the insulating connector 300, and to avoid large-area exposure of the shell 100.

[0065] Therefore, the relationship between the area of the first hollow area 210 and the width Dmm of the first side surface in the present embodiment is classified into four kinds of 2.5Dmm 2 , 4.5Dmm 2 , 7.5Dmm 2 , or 13.5Dmm 2 , so as to reduce the design difficulty of the first hollow area 210 under the premise of meeting the functional requirements of the first hollow area 210, which is helpful for mass production.

[0066] As Figure 4 , Figure 4 shown is a side view of the battery cell, in some embodiments, along the direction perpendicular to the first side surface 110 (such as the Y direction in Figure 4 , the orthogonal projection of the first hollow area 210 on the shell 100 is a rectangle, the size of the rectangle along the height direction of the shell 100 (such as the Z direction in Figure 4 ) is defined as the length Hmm of the rectangle, and the ratio of the width Lmm of the rectangle to the length Hmm is 0.3 to 3.

[0067] Exemplarily, L / H can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.3, 1.5, 1.8, 2, 2.3, 2.5, 2.8, or 3.

[0068] In the process of covering the shell 100 with the insulating film 200, i.e., when the insulating film 200 is in a flat state, the insulating film 200 can be cut. After the cutting, the insulating film 200 can be covered outside the shell 100, and after the insulating film 200 is attached to the outer surface of the shell 100, the cut parts can be spliced to form the first hollow area 210.

[0069] As can be seen from the foregoing, the first hollow area 210 is formed by splicing the cutting patterns formed at different positions on the insulating film 200. The first hollow area 210 is designed as a rectangle, which can facilitate the size design of the cutting pattern. After the insulating film 200 is covered on the shell 100, it is ensured that the different cutting patterns can be spliced to form the first hollow area 210 meeting the design requirements, so that the shell 100 with a preset area is exposed through the first hollow area 210, and thus it is ensured that the insulating connecting piece 300 can form a reliable connection with the battery cell.

[0070] As Figure 4 In some embodiments, the length Hmm of the rectangle is 5 mm to 15 mm.

[0071] For example, Hmm can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm.

[0072] Generally, the length Hmm of the first hollow area 210 corresponds to the width hmm of the insulating connecting piece 300. If the length Hmm of the first hollow area 210 is too large, a wider insulating connecting piece 300 is needed to cover the first hollow area 210, which can ensure the insulation performance of the battery cell, but can also cause interference between the insulating connecting piece 300 and other structures or devices in the battery module, or increase the material cost of the insulating connecting piece 300, which is not conducive to mass production.

[0073] However, if the length Hmm of the first hollow area 210 is too small, in order to make the area of the first hollow area 210 meet the above range, the width Lmm of the first hollow area 210 needs to be very large. It is likely that even if the first hollow area 210 extends to the edge of the first side surface 110 along the width direction, the area of the first hollow area 210 is still insufficient to meet the requirements, which can result in that it is difficult to ensure that the connection strength between the insulating connecting piece 300 and the battery cell meets the test requirements of the vibration impact test.

[0074] In summary, the length Hmm of the first hollowed-out area 210 is limited to the range of 5mm to 15mm in this embodiment, which can ensure reliable connection between the insulating connecting piece 300 and the battery cell, and also enable the insulating connecting piece 300 to cover the first hollowed-out area 210 more easily, thereby reducing the exposed area of the shell 100 and improving the insulation performance of the battery cell.

[0075] As Figure 4 In some embodiments, the width Lmm of the rectangle is 0.5Dmm to 0.9Dmm.

[0076] For example, the Lmm can be 0.5Dmm, 0.6Dmm, 0.7Dmm, 0.8Dmm or 0.9Dmm.

[0077] If the width Lmm of the first hollowed-out area 210 is too large, it is likely that the area of the insulating film 200 on both sides of the first hollowed-out area 210 in the width direction is small, and accordingly, it is difficult for the insulating film 200 at this position to form reliable adhesion with the first side surface 110, and the insulating film 200 around the first hollowed-out area 210 and the shell 100 can be separated from each other. If the width Lmm of the first hollowed-out area 210 is too small, it is also difficult to ensure reliable connection between the battery cell and the insulating connecting piece 300.

[0078] Therefore, the width Lmm of the first hollowed-out area 210 is limited to the range of 0.5Dmm to 0.9Dmm in this embodiment, which can ensure that the insulating film 200 around the first hollowed-out area 210 can form reliable adhesion with the first side surface 110, and also ensure reliable connection between the battery cell and the insulating connecting piece 300.

[0079] As Figure 4 In some embodiments, the width Lmm of the rectangle is greater than the length Hmm of the rectangle.

[0080] In general, when the insulating connecting piece 300 is connected with the battery cell, the insulating connecting piece 300 extends from one side edge of the first side surface 110 to the other side edge. Since the first hollowed-out area 210 does not exceed the two side edges of the first side surface 110 in the width direction, even if the width of the first hollowed-out area 210 is large, the insulating connecting piece 300 can easily cover the entire area of the first hollowed-out area 210 in the width direction.

[0081] In combination with the foregoing, when the length Hmm of the first hollowed-out area 210 is small, the width Hmm of the insulating connecting piece 300 can also be designed to be small, which helps to reduce the preparation cost of the insulating connecting piece 300 and is conducive to mass production.

[0082] As Figure 4 In some embodiments, the first hollowed-out area 210 extends to the top 120 and / or the bottom of the first side surface 110 in the height direction of the shell 100.

[0083] Extending the first hollowed-out area 210 to the top 120 or the bottom of the first side surface 110 can make it easier to position the cutting pattern when cutting the insulating film 200, which helps to improve the dimensional accuracy and positional accuracy of the first hollowed-out area 210, ensures that the connecting area between the shell 100 exposed through the first hollowed-out area 210 and the insulating connecting piece 300 meets the requirements, and further ensures that the connecting strength between the battery cell and the insulating connecting piece 300 meets the test requirements of the vibration impact test.

[0084] As Figure 1 and Figure 4 In some embodiments, the top 120 of the shell 100 is connected with a cover plate assembly 400, and the edge of the first hollowed-out area 210 coincides with the top edge of the first side surface 110.

[0085] When the edge of the first hollowed-out area 210 coincides with the top edge of the first side surface 110, the first hollowed-out area 210 corresponds to the shoulder of the battery cell. On the one hand, it can reduce the cutting difficulty of the insulating film 200; on the other hand, there may be a structure protruding from the first side surface 110 at the connection between the cover plate assembly 400 and the shell 100, and if the protruding structure interferes with the insulating film 200, it will affect the fitting quality of the insulating film 200 and the surface of the shell 100. The first hollowed-out area 210 of the present embodiment can avoid the connection between the cover plate assembly 400 and the shell 100, thereby reducing the risk of the insulating film 200 being separated from the surface of the shell 100 due to the structure protruding from the first side surface 110, and helping to improve the fitting quality of the insulating film 200 and the surface of the shell 100.

[0086] Based on the same inventive concept, in combination with the description of the battery cell in the above various embodiments, the present embodiment provides a battery module, which has the corresponding technical effects of the battery cell in the above various embodiments, which will not be described here.

[0087] A battery module comprising the battery cell as described in the above various embodiments.

[0088] As Figure 2 In some embodiments, the battery module comprises an insulating connecting piece 300, and the insulating connecting piece 300 is bonded to the part of the shell 100 exposed through the first hollowed-out area 210.

[0089] The beneficial effects of bonding the insulating connecting piece 300 to the shell 100 are the same as those of directly connecting the insulating connecting piece 300 to the shell 100, which will not be described here.

[0090] As Figure 2In some embodiments, the first hollow area 210 is located inside the projection of the insulating connector 300 on the first side 110 in a direction perpendicular to the first side 110.

[0091] In the present embodiment, the first hollow area 210 is located inside the projection of the insulating connector 300 on the first side 110, i.e., the insulating connector 300 connected to the battery cell can completely cover the first hollow area 210 of the battery cell, so as to further improve the insulation performance of the battery cell and avoid insulation failure of the battery cell.

[0092] As shown in FIG. 1, Figure 2 In some embodiments, the battery module includes at least two battery cells, the stacking direction (e.g., the X direction in FIG. 1) of the at least two battery cells is perpendicular to the height direction of the shell 100, the first side 110 of each of the at least two battery cells is located on the same side, and the at least two battery cells are connected to the same insulating connector 300. Figure 2 In the present embodiment, the first hollow area 210 is located inside the projection of the insulating connector 300 on the first side 110, i.e., the insulating connector 300 connected to the battery cell can completely cover the first hollow area 210 of the battery cell, so as to further improve the insulation performance of the battery cell and avoid insulation failure of the battery cell.

[0093] Figure 2 As shown in FIG. 1, Figure 2 In the present embodiment, the first hollow area 210 is located inside the projection of the insulating connector 300 on the first side 110, i.e., the insulating connector 300 connected to the battery cell can completely cover the first hollow area 210 of the battery cell, so as to further improve the insulation performance of the battery cell and avoid insulation failure of the battery cell.

[0094] When the same insulating connector 300 is connected to the at least two battery cells, the at least two battery cells can be connected together by the insulating connector 300 to form an integral whole due to the large connection strength between the insulating connector 300 and the battery cells, and the integral whole has large structural strength and can meet the test requirements of the vibration impact test.

[0095] Based on the same inventive concept, the battery module described in each of the above embodiments has the corresponding technical effects of the battery module described in each of the above embodiments, which will not be described here.

[0096] A battery pack includes the battery module described in each of the above embodiments.

[0097] ​It is noted that some embodiments have been described as to what is presently considered to be a practical application of the present application. Other embodiments are within the scope of the following claims. In some cases, an act or step can be performed in a different order from the order described in the embodiments. Additionally, iterations of a process can not be explicitly shown or described. In certain instances, multitasking and parallel processing can be advantageous. Other embodiments can be within the scope of the following claims.

[0098] Each of the various embodiments in the present application is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between various embodiments can be mutually referred to.

[0099] The description of the present application is given for the purpose of exemplification and description and is not intended to be exhaustive or to limit the application to the precise form disclosed. Many modifications and variations are possible in light of the above teachings. Embodiments are chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated.

[0100] Those of ordinary skill in the art will appreciate that the above discussion of various embodiments is for illustrative purposes only and is not intended to limit the scope of the application. The technical features of the above embodiments or between different embodiments can be combined, steps can be implemented in any order, and there are many other changes to the aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in detail.

[0101] Although the present application has been described in connection with certain specific embodiments thereof, many modifications, changes, variations and substitutions will now occur to those skilled in the art to which the present application pertains without departing from the spirit and scope of the application as set forth in the following claims.

[0102] The embodiments of the present application are intended to cover all such modifications, changes, variations and substitutions as come within the scope of the application. Accordingly, the application is not to be limited by the above description but is only limited by the following claims.

Claims

1. An electric cell, characterized by, Comprising: a shell having a first side, a dimension of the first side perpendicular to a height direction of the shell defines a width Dmm of the first side; An insulating film is wrapped outside the shell, a part of the insulating film provided on the first side surface is formed with a first hollow area, the part of the shell exposed through the first hollow area is used for direct connection with an insulating connector, and the area of the first hollow area is 2.5Dmm 2 to 13.5Dmm 2 .

2. The electric cell of claim 1, wherein, 2mm≤Dmm≤8mm.

3. The electric cell of claim 1, wherein, 2.8mm≤Dmm≤3.2mm.

4. The electric cell of claim 1, wherein, The first hollowed-out area is 2.5D mm 2 , 4.5D mm 2 , 7.5D mm 2 or 13.5D mm 2 .

5. The electric cell of claim 1, wherein, In a direction perpendicular to the first side, the first hollowed-out region is a rectangle in a projection of the shell, a dimension of the rectangle along the height direction of the shell defines a length of the rectangle, a ratio of a width of the rectangle to the length is 0.3 to 3.

6. The electric cell of claim 5, wherein, The length of the rectangle is 5mm to 15mm.

7. The electric cell of claim 5, wherein, The width of the rectangle is 0.5Dmm to 0.9Dmm.

8. The electric cell of claim 1, wherein, The first hollowed-out region extends to a top and / or a bottom of the first side along the height direction of the shell.

9. The electric cell of claim 8, wherein, A top of the shell is connected with a cover plate assembly, an edge of the first hollowed-out region coincides with a top edge of the first side.

10. A battery module, characterized by Comprising the battery cell as claimed in any one of claims 1 to 9.

11. The battery module of claim 10, wherein, The battery module comprises an insulating connector, the insulating connector is bonded with a part of the shell exposed through the first hollowed-out region.

12. The battery module of claim 10, wherein, In a direction perpendicular to the first side, a projection of the first hollowed-out region on the first side is inside a projection of the insulating connector on the first side.

13. The battery module of claim 10, wherein, The battery module comprises at least two battery cells, a stacking direction of the at least two battery cells is perpendicular to the height direction of the shell, the first side of each of the at least two battery cells is on the same side, and the at least two battery cells are connected to the same insulating connector.

14. A battery pack, characterized by Comprising the battery module as claimed in any one of claims 10 to 13.

Images