Battery cell and battery module

Abstract

The invention relates to the technical field of energy storage equipment, in particular to a battery cell and a battery module, and the battery cell comprises a shell, a pole group and an insulating part. The insulating part is arranged at the opening of the shell, the insulating part is provided with A protruding parts which protrude towards the first end face, each protruding part is provided with a second end face, the second end faces abut against the first end face of the pole group so that the compression amount of the pole group at the first end face can be H0, each protruding part is provided with a first inclined side face which is obliquely arranged towards the first end face, and the first inclined side face abuts against the second end face of the pole group. A first receding space is defined by the first inclined side face and the inner wall of the shell jointly, the corner of the first end face is located in the first receding space, the included angle between the first inclined side face and the first end face is an acute angle alpha, the height of each protruding part in the direction perpendicular to the first end face is H1, the sum of the areas of the second end faces of the A protruding parts is S0, and the A is larger than or equal to 1. The length L of the first end surface meets the following condition: beta = 90 degrees-alpha;

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage devices, and particularly relates to a battery cell and a battery module. BACKGROUND

[0002] The cover plate structure of the battery cell generally comprises a top cover, a pole and an insulating piece. The insulating piece can prevent the top cover made of metal material from being in conduction with the pole. The insulating piece is attached to the inner side of the top cover, and the side of the insulating piece away from the top cover abuts against the end face of the pole group. In the process of the pole group entering the shell, the insulating piece needs to abut against the end face of the pole group to push the pole group into the shell. When the finished battery cell is in the environment of vibration, impact and the like, the pole group moves in the shell, and the acting force between the insulating piece and the pole group also increases. In the above case, the corner of the pole group is often pressed by the insulating piece, which affects the process yield and safety performance of the battery cell. SUMMARY

[0003] An object of the present application is to provide a battery cell which can help to avoid the corner of the pole group from being pressed, and has higher process yield and safety performance.

[0004] To achieve the above object, the present application adopts the following technical scheme:

[0005] The present application provides a battery cell, comprising:

[0006] a shell;

[0007] a pole group arranged in the shell, the pole group comprising a first end face;

[0008] an insulating piece arranged at the opening of the shell, the insulating piece having A protruding parts protruding towards the first end face, each of the protruding parts having a second end face abutting against the first end face to make the compression amount of the pole group at the first end face H0, each of the protruding parts having a first inclined side surface inclined towards the first end face, the first inclined side surface and the inner wall of the shell together forming a first avoiding space, the corner of the first end face being located in the first avoiding space, the included angle between the first inclined side surface and the first end face being an acute angle a, the height of the protruding part in the direction perpendicular to the first end face being H1, the sum of the areas of the second end faces of the A protruding parts being S0, and the length of the first end face being L, satisfying: β = 90° - a, H0 < H1 < L, and S0 < L.

[0009] Optionally, the sum S0 of the areas of the second end faces of the A protruding parts satisfies: 500mm 2 ≤ S0 ≤ 7000mm 2 .

[0010] Optionally, an included angle α between the first inclined side surface and the first end surface satisfies: 83°≤α≤87°.

[0011] Optionally, a height H1 of the protruding portion in a direction perpendicular to the first end surface satisfies: 5mm≤H1≤8.5mm.

[0012] Optionally, a compression amount H0 of the pole group at the first end surface satisfies: 1.5mm≤H0≤2.5mm.

[0013] Optionally, a length L of the first end surface satisfies: 375mm≤L≤580mm.

[0014] Optionally, the insulating member has two protruding portions, and the two protruding portions are respectively arranged at two ends of the insulating member in a length direction of the insulating member, and the first inclined side surface of the two protruding portions is respectively a side surface of the two ends of the insulating member in the length direction of the insulating member.

[0015] Optionally, each of the first avoiding spaces has two corner portions of the pole groups, and a minimum distance between the first inclined side surface and the two corner portions of the adjacent pole groups is consistent.

[0016] Optionally, an edge of the second end surface is arranged as a chamfered edge.

[0017] Optionally, each of the protruding portions further has a second inclined side surface, the second inclined side surface is arranged to be inclined towards the first end surface, the second inclined side surface and an inner wall of the shell collectively form a second avoiding space, and an edge of the first end surface is at least partially located in the second avoiding space.

[0018] Another object of the present application is to provide a battery module, which can help to avoid the corner portion of the pole group being crushed, and has higher process yield and safety performance.

[0019] To achieve the above object, the present application adopts the following technical solutions:

[0020] The present application provides a battery module, which comprises a module shell and at least one above-mentioned battery cell, and the at least one battery cell is located in the module shell.

[0021] The present application has the following beneficial effects:

[0022] The application provides an electric core, which comprises a shell, a pole group and an insulating piece. The pole group is arranged in the shell and comprises a first end face. The insulating piece is arranged at an opening of the shell and has A protruding parts which are arranged protruding towards the first end face. Each protruding part has a second end face which abuts against the first end face so that the compression amount of the pole group at the first end face is H0. Each protruding part has a first inclined side face which is arranged inclined towards the first end face. The first inclined side face and the inner wall of the shell jointly form a first avoiding space. The corner of the first end face is located in the first avoiding space. The included angle between the first inclined side face and the first end face is an acute angle α. The height of the protruding part along the direction perpendicular to the first end face is H1. The sum of the areas of the second end faces of the A protruding parts is S0. The length of the first end face is L. The following conditions are met: β = 90° - α, S0 > L*H0, H1 > H0, and 0 < α < 90°. By arranging the first inclined side face of the protruding part inclined, the corner of the pole group can be avoided, the corner of the pole group is prevented from being pressed by the insulating piece, and the process yield and safety performance of the electric core are improved.

[0023] The application further provides a battery module which comprises a module shell and at least one electric core. The at least one electric core is located in the module shell. The battery module can help to avoid the corner of the pole group from being pressed, and has higher process yield and safety performance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 FIG. 1 is a partial structure schematic diagram of the electric core from a first perspective according to an embodiment of the application;

[0025] Fig. 2 FIG. 2 is a partial structure schematic diagram of the electric core from a second perspective according to an embodiment of the application;

[0026] Fig. 3 FIG. 3 is a structure schematic diagram of the first top cover and the insulating piece according to an embodiment of the application.

[0027] In the drawings:

[0028] 2, pole group; 21, first end face; 22, pole lug;

[0029] 3, insulating piece; 31, protruding part; 311, second end face; 312, first inclined side face; 313, chamfer;

[0030] 4, first top cover; 5, second top cover; 6, end plate;

[0031] 100, first avoiding space. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for the convenience of description.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0035] The cover plate structure of the battery cell generally includes a top cover, a pole and an insulating piece. The insulating piece can prevent the top cover and the pole of the cover plate structure from being in conductive short circuit. The insulating piece is attached to the inner side of the top cover, and the side of the insulating piece away from the top cover abuts against the end face of the pole group. In the process of the pole group entering the shell, the insulating piece needs to abut against the end face of the pole group to push the pole group into the shell. When the finished battery cell is in the environment of vibration, impact and the like, and the pole group moves in the shell, the acting force between the insulating piece and the pole group will also increase. In the above case, the corner of the pole group is often pressed by the insulating piece, which affects the process yield and safety performance of the battery cell.

[0036] Therefore, the present embodiment provides a battery cell to solve the above problems, which can help to avoid the corner of the pole group 2 being pressed, and has higher process yield and safety performance.

[0037] As Figs. 1-3As shown, the battery cell of the embodiment includes a shell, a pole group 2 and an insulating piece 3. The pole group 2 is arranged in the shell, and the pole group 2 includes a first end face 21. The insulating piece 3 is arranged at an opening of the shell, and the insulating piece 3 has A protruding portions 31 protruding towards the first end face 21. Each protruding portion 31 has a second end face 311 abutting against the first end face 21, so that a compression amount H0 of the pole group 2 at the first end face 21 is obtained, i.e., the compression amount H0 of the pole group 2 is the compression amount of the pole group 2 at the end of the first end face 21.

[0038] Each protruding portion 31 has a first inclined side face 312 inclined towards the first end face 21, and the first inclined side face 312 and an inner wall of the shell jointly define a first avoiding space 100 in which a corner of the first end face 21 is located. By inclining the first inclined side face 312 of the protruding portion 31, the corner of the pole group 2 can be avoided, so that the corner of the pole group 2 is not damaged by the insulating piece 3, which helps to improve the process yield and safety performance of the battery cell.

[0039] An included angle between the first inclined side face 312 and the first end face 21 is an acute angle α, β = 90°-α, a height of the protruding portion 31 along a direction perpendicular to the first end face 21 is H1, i.e., a height of the first inclined side face 312 along a direction perpendicular to the first end face 21 is H1. A sum of areas of the second end faces 311 of the A protruding portions 31 is S0, i.e., if A is 2, a sum of an area of the second end face 311 of one protruding portion 31 and an area of the second end face 311 of the other protruding portion 31 is S0. A length of the first end face 21 is L, i.e., a dimension of the first end face 21 along a length direction of the insulating piece 3 is L. The above parameters jointly satisfy

[0040] To The value of the first compression amount H0 at the first end surface 21 of the pole group 2 is limited, which limits the value of each parameter to some extent. It is known that if the compression amount H0 of the pole group 2 at the first end surface 21 is too large, the pressing between the pole group 2 and the insulating piece 3 is too deep. Not only the deformation of the first end surface 21 of the pole group 2 will increase, but also the shortest distance between the first inclined side surface 312 and the corner of the first end surface 21 of the pole group 2 will decrease with the increase of the pressing depth between the pole group 2 and the insulating piece 3. Not only the deformation of the corner of the pole group 2 will occur, but also the distance between the first inclined side surface 312 and the corner of the pole group 2 will be so small that the corner of the pole group 2 will be deformed under pressure. If the compression amount H0 of the pole group 2 at the first end surface 21 is too small, the pressing force between the pole group 2 and the insulating piece 3 is insufficient, and the fixing effect of the insulating piece 3 on the pole group 2 is easy to fail. When the battery cell is shaken violently, the pole group 2 is easy to move in the shell of the battery cell. And because the pole lug 22 of the pole group 2 is connected to the output end on the top cover for conduction, the body of the pole group 2 will move greatly relative to the pole lug 22, causing the pole lug 22 to be deformed or even torn.

[0041] Moreover, for the sum S0 of the areas of the second end surfaces 311 of the A protrusions 31, if S0 is too large, the first avoiding space 100 will be small when the length and width of the insulating piece 3 are unchanged, causing the first inclined side surface 312 to be too close to the corner of the pole group 2, and the corner of the pole group 2 is still easy to be pressed. Or the accommodation space reserved for the pole lug 22 by the insulating piece 3 will be too small, causing the pole lug 22 to be too narrow for conduction, or the distance between the pole lug 22 and the protrusion 31 is too close, and when there is a machining error and an assembly error, the pole lug 22 is easy to contact the protrusion 31, and the pole lug 22 is easy to be deformed or damaged. If S0 is too small, the contact area between the insulating piece 3 and the pole group 2 is insufficient, and when the compression depth is unchanged, the smaller the contact area between the insulating piece 3 and the pole group 2, the more likely the fixing effect of the insulating piece 3 on the pole group 2 will fail. When the battery cell is shaken violently, the pole group 2 is easy to move in the shell of the battery cell. And because the pole lug 22 of the pole group 2 is connected to the output end on the top cover for conduction, the body of the pole group 2 will move greatly relative to the pole lug 22, causing the pole lug 22 to be deformed or even torn.

[0042] If the height H1 of the protrusion 31 in the direction perpendicular to the first end face 21 is too large, the distance between the edge of the second end face 311 and the corner of the pole group 2 will be larger when the inclination angle of the first inclined side face 312 is unchanged, and the corner of the pole group 2 is not easily crushed. However, if H1 is too large, the insulating piece 3 is too thick, and the insulating piece 3 occupies too much space in the electric core, which is not conducive to improving the volume energy density of the electric core. If H1 is too small, the distance between the edge of the second end face 311 and the corner of the pole group 2 will be too small when the inclination angle of the first inclined side face 312 is unchanged, and the corner of the pole group 2 is still easily crushed. Moreover, the thickness of the insulating piece 3 is too low, which will also affect the structural strength of the insulating piece 3.

[0043] If the length L of the first end face 21 of the pole group 2 is too large, the distance between the edge of the second end face 311 of the insulating piece 3 and the corner of the first end face 21 will increase when the size of the insulating piece 3 is unchanged, and the corner of the pole group 2 is not easily crushed. However, the area of the second end face 311 of the protrusion 31 of the insulating piece 3 needs to be increased accordingly to ensure that the insulating piece 3 can fix the pole group 2. If the length L of the first end face 21 of the pole group 2 is too small, the distance between the edge of the second end face 311 of the insulating piece 3 and the corner of the first end face 21 will decrease, and the corner of the pole group 2 is easily crushed.

[0044] As shown in Fig. 2 If the included angle a between the first inclined side face 312 and the first end face 21 is too large, the value of b will be too small, the inclination of the first inclined side face 312 is too low, and the distance between the side between the first inclined side face 312 and the second end face 311 and the corner of the first end face 21 will be too small, and the corner of the pole group 2 is still easily crushed. If the included angle a between the first inclined side face 312 and the first end face 21 is too small, the value of b will be too large, the inclination of the first inclined side face 312 is too large, which will affect the structural strength of the protrusion 31 to some extent, and when the overall size of the insulating piece 3 is unchanged, the inclination of the first inclined side face 312 is too large, the area of the second end face 311 of the protrusion 31 will be too small accordingly, although it can ensure that the corner of the pole group 2 is not crushed, but the contact area between the insulating piece 3 and the pole group 2 is too small, and the fixing effect of the insulating piece 3 on the pole group 2 is easily invalid. When the electric core is shaken violently, the pole group 2 is easily moved in the shell of the electric core. And because the pole lug 22 of the pole group 2 is connected with the output end on the top cover to conduct, the body of the pole group 2 will have a large movement relative to the pole lug 22, causing the pole lug 22 to deform or even tear.

[0045] It can be seen that the above-mentioned multiple parameters jointly affect the degree of crushing of the corner of the pole group 2 of the electric core, whether the pole group 2 can be fixed by the insulating piece 3, and the volume energy density of the electric core and other key factors of the quality of the electric core, and when the above-mentioned several key performances of the electric core are satisfied, , the above-mentioned several key performances of the electric core can be balanced.

[0046] Optionally, the insulation piece 3 has two protrusions 31, which are respectively arranged at two ends of the insulation piece 3 along the length direction of the insulation piece 3, and the first inclined side surface 312 of each of the two protrusions 31 is the side surface of the two ends of the insulation piece 3 along the length direction of the insulation piece 3. That is, along the thickness direction of the insulation piece 3, the end surface of the protrusion 31 opposite to the second end surface 311 is flush with the end surface of the insulation piece 3 facing the top cover, and the thickness of the protrusion 31 is the maximum thickness of the insulation piece 3.

[0047] Optionally, each of the first inclined side surfaces 312 has a minimum distance to the corner of the two adjacent pole groups 2, and the edge between the second end surface 311 and the first inclined side surface 312 is parallel to the side edge of the first end surface 21 of the pole group 2 at one end of the pole group 2 along the length direction of the pole group 2, so that each corner of the pole group 2 is not crushed, and the situation that two corners in the same first avoiding space 100 are crushed and not crushed does not occur.

[0048] Optionally, the sum S0 of the areas of the second end surfaces 311 of the A protrusions 31 satisfies: 500mm 2 ≤ S0 ≤ 7000mm 2 If S0 is greater than 7000mm 2 , the first avoiding space 100 will be smaller when the length and the width of the insulation piece 3 are unchanged, so that the first inclined side surface 312 is too close to the corner of the pole group 2, and the corner of the pole group 2 is still easily crushed. Or on the premise of ensuring that the first avoiding space 100 is large enough, the insulation piece 3 will reserve a small accommodation space for the tab 22, which will cause the tab 22 to be too narrow and the electric conduction to be insufficient, or the distance between the tab 22 and the protrusion 31 is too close, and when there is a machining error and an assembly error, the tab 22 is easily in contact with the protrusion 31, and the tab 22 is easily deformed or damaged. If S0 is less than 500mm 2 , the contact area between the insulation piece 3 and the pole group 2 is insufficient, and when the compression depth is unchanged, the smaller the contact area between the insulation piece 3 and the pole group 2 is, the smaller the fixing effect of the insulation piece 3 on the pole group 2 is. When the battery is subjected to severe shaking, the pole group 2 is easily moved in the shell of the battery. And because the tab 22 of the pole group 2 is connected to the output end on the top cover for conduction, the body of the pole group 2 will have a large movement relative to the tab 22, causing the tab 22 to be deformed or even torn.

[0049] Optionally, the included angle a between the first inclined side surface 312 and the first end surface 21 satisfies: 83°≤a≤87°, that is, β satisfies 3°≤β≤7°. If a is greater than 87°, β is less than 3°, the inclination of the first inclined side surface 312 is too low, the distance between the side edge between the first inclined side surface 312 and the second end surface 311 and the corner of the first end surface 21 is too small, and the corner of the pole group 2 is still prone to be crushed. If a is less than 83°, β is greater than 7°, the inclination of the first inclined side surface 312 is too large, when the overall size of the insulating piece 3 is unchanged, the inclination of the first inclined side surface 312 is too large, the area of the second end surface 311 of the protruding portion 31 is correspondingly too small, although it can be ensured that the corner of the pole group 2 is not crushed, but the contact area between the insulating piece 3 and the pole group 2 is too small, and the fixing effect of the insulating piece 3 on the pole group 2 is prone to fail. When the battery cell is subjected to severe shaking, the pole group 2 is prone to move in the shell of the battery cell. And because the pole lug 22 of the pole group 2 is connected in conduction with the output end on the top cover, the body of the pole group 2 will have a large movement relative to the pole lug 22, causing the pole lug 22 to be deformed or even torn.

[0050] Optionally, the height H1 of the protruding portion 31 in the direction perpendicular to the first end surface 21 satisfies: 5mm≤H1≤8.5mm. If H1 is greater than 8.5mm, when the inclination angle of the first inclined side surface 312 is unchanged, the distance between the edge of the second end surface 311 and the corner of the pole group 2 will be large, and the corner of the pole group 2 is not prone to be crushed. But H1 is too large, causing the insulating piece 3 to be too thick, and the insulating piece 3 occupies too much space in the battery cell, which is not conducive to improving the volume energy density of the battery cell. If H1 is less than 5mm, when the inclination angle of the first inclined side surface 312 is unchanged, the distance between the edge of the second end surface 311 and the corner of the pole group 2 will be too small, and the corner of the pole group 2 is still prone to be crushed, and the thickness of the insulating piece 3 is too low, which will also affect the structural strength of the insulating piece 3.

[0051] Optionally, the compression amount H0 of the pole group 2 at the first end face 21 satisfies: 1.5mm≤H0≤2.5mm. If the compression amount H0 of the pole group 2 at the first end face 21 is greater than 2.5mm, the pressing between the pole group 2 and the insulating piece 3 is too deep, not only the deformation of the first end face 21 of the pole group 2 is increased, but also the shortest distance between the first inclined side face 312 and the corner of the first end face 21 of the pole group 2 is reduced with the increase of the pressing depth between the pole group 2 and the insulating piece 3, not only the deformation of the corner of the pole group 2 is increased, but also the corner of the pole group 2 is deformed under the pressure when the distance between the first inclined side face 312 and the corner of the pole group 2 is small enough. If the compression amount H0 of the pole group 2 at the first end face 21 is less than 1.5mm, the pressing between the pole group 2 and the insulating piece 3 is not enough, and the fixing of the pole group 2 by the insulating piece 3 is easily failed. When the battery cell is shaken violently, the pole group 2 is easily moved in the shell of the battery cell. And because the tab 22 of the pole group 2 is connected to the output terminal on the top cover for conduction, the body of the pole group 2 is easily moved relative to the tab 22, which causes the deformation or even tearing of the tab 22.

[0052] Optionally, the length L of the first end face 21 satisfies: 375mm≤L≤580mm. If the length L of the first end face 21 of the pole group 2 is greater than 580mm, the distance between the edge of the second end face 311 of the insulating piece 3 and the corner of the first end face 21 is increased when the size of the insulating piece 3 is unchanged, and the corner of the pole group 2 is not easily pressed. But the area of the second end face 311 of the protruding part 31 of the insulating piece 3 needs to be increased correspondingly to ensure that the insulating piece 3 can fix the pole group 2. If the length L of the first end face 21 of the pole group 2 is less than 375mm, the distance between the edge of the second end face 311 of the insulating piece 3 and the corner of the first end face 21 is reduced, and the corner of the pole group 2 is easily pressed.

[0053] In order to verify whether the battery cell can prevent the corner of the pole group 2 from being pressed and can ensure that the pole group 2 is fixed and not easily moved, has higher process yield and safety performance, the embodiment provides twelve groups of examples and three groups of comparative examples of battery cells with different sizes, as shown in the following Table 1 and Table 2, and the battery cells are tested. The specific detection contents include whether the first end face 21 and the tab 22 of the pole group 2 are abnormal after the pole group 2 is assembled into the shell, whether the pole group 2 is moved in the vibration test, whether the tab 22 is torn, and whether the corner of the pole group 2 is pressed after the assembled battery cell is subjected to the vibration test and CT detection.

[0054] As shown in the following Table 1 and Table 2, the same points of the twelve groups of examples and the three groups of comparative examples of battery cells provided by the embodiment are that the following conditions are met: 500mm 2 ≤S0≤7000mm 2, 3°≤β≤7°, 5mm≤H1≤8.5mm, 1.5mm≤H0≤2.5mm, 375mm≤L≤580mm.

[0055] As shown in Table 1 below, the twelve groups of the battery cells also satisfy It is detected that the first end surface 21 and the tab 22 of the pole group 2 of the twelve groups of the battery cells do not have abnormalities after the pole group 2 is assembled into the shell, and the pole group 2 of the battery cell after the assembly is completed does not move in the vibration test, the tab 22 is not torn, and the corner of the pole group 2 is not crushed. It can be seen that when the battery cell satisfies the above-mentioned more optimal value range, not only the corner of the pole group 2 is not crushed, but also the insulating piece 3 can fix the pole group 2, the pole group 2 does not move, and the insulating piece 3 does not crush the first end surface 21 of the pole group 2, the tab 22 is not torn, and the battery cell has a higher process yield.

[0056] Table 1

[0057]

[0058]

[0059] Table 2

[0060]

[0061] As shown in Table 2 above, the battery cell of the comparative example 1 has The value of 1.36 is less than the minimum value 1.4 of the more optimal value range. It is detected that the corner of the pole group 2 of the battery cell does not have a crush, that is, the first avoiding space 100 has an avoiding effect, but the insulating piece 3 of the battery cell cannot well fix the pole group 2. In the experiment, five battery cells are extracted for vibration test and CT detection, and two of them have a phenomenon that the position of the pole group 2 obviously moves, and the tab 22 is torn.

[0062] As shown in Table 2 above, the battery cell of the comparative example 2 has The value of 1.37 is still less than the minimum value 1.4 of the more optimal value range. It is detected that the corner of the pole group 2 of the battery cell does not have a crush, that is, the first avoiding space 100 has a good avoiding effect, but the insulating piece 3 of the battery cell cannot well fix the pole group 2. In the experiment, five battery cells are extracted for vibration test and CT detection, and one of them has a phenomenon that the position of the pole group 2 obviously moves, and the tab 22 is torn. Compared with the battery cell of the comparative example 1, the process yield of the battery cell of the comparative example 2 is improved.

[0063] As shown in Table 2 above, the battery cell of the comparative example 3 has The value of the first inclination side 312 is 4.55, which is greater than the maximum value 4.5 of the more optimal value range. It is detected that after the group of cells is put into the shell, the corner of the group of cells 2 has slight pressure marks, that is, the first avoiding space 100 has a certain avoiding effect, but it cannot completely solve the problem of pressure marks. However, after the group of cells is subjected to the vibration test and CT detection, the group of cells 2 does not appear to be dislocated, and the tab 22 is not torn. Although the group of cells has slight pressure marks on the corner of the group of cells 2 after being put into the shell, compared with the group of cells without the first inclination side 312 on the protruding part 31 of the insulating part 3, the pressure marks of the group of cells are slight. It can be seen that the setting of the first inclination side 312 has a certain effect on relieving the problem of pressure marks on the corner of the group of cells 2. When the value of the first inclination side 312 further meets the value range of 1.4-4.5, it can be ensured that the group of cells 2 is smoothly put into the shell, the first end face 21 of the group of cells 2 and the tab 22 are all normal, and the group of cells after assembly does not dislocate in the vibration test, the tab 22 is not torn, the corner of the group of cells 2 is not pressed, and the group of cells has higher process yield and safety performance.

[0064] In order to prevent the edge of the first end face 21 from being pressed, the edge of the second end face 311 is optionally chamfered 313, which can further increase the avoiding space and prevent the edge of the second end face 311 from being too sharp to press the edge or corner of the first end face 21.

[0065] Optionally, in the embodiment, the edge between the first inclination side 312 and the second end face 311 is chamfered 313, which can further increase the first avoiding space 100 and increase the distance between the edge of the second end face 311 and the corner of the group of cells 2. Moreover, the angle of the edge of the second end face 311 near the corner of the group of cells 2 can be further increased to further avoid pressing the position near the corner of the group of cells 2.

[0066] Optionally, in the embodiment, the remaining edges of the second end face 311 are also chamfered 313 to avoid other side edges of the first end face 21 of the group of cells 2 to prevent the side edges of the first end face 21 of the group of cells 2 from being pressed.

[0067] Optionally, in other embodiments, each protruding part 31 also has a second inclination side, which is inclined towards the first end face 21, and the second inclination side and the inner wall of the shell together form a second avoiding space, and the edge of the first end face 21 is at least partially located in the second avoiding space. Optionally, the two sides adjacent to the first inclination side 312 can be set as the second inclination side.

[0068] ​Optionally, the battery cell further comprises a first top cover 4 arranged outside the insulating member 3, and the insulating member 3 is used to separate the first top cover 4 from the pole group 2. Optionally, in the embodiment, the battery cell further comprises a second top cover 5 and an end plate 6 arranged at the other end opening of the shell, and the end plate 6 is arranged inside the second top cover 5 to press against the pole group 2. Of course, in other embodiments, the same insulating member 3 and top cover can also be arranged at the other end of the battery cell, i.e. the insulating member 3 with the protrusion 31 is arranged at both ends of the pole group 2 to press against the pole group 2. Optionally, in the embodiment, the two output terminals of the positive and negative poles are arranged on the first top cover 4 and the second top cover 5 respectively, i.e. the pole group 2 is a two-end tab 22. Of course, in other embodiments, the two output terminals can also be arranged on the same top cover.

[0069] The embodiment also provides a battery module, which comprises a module shell and at least one battery cell as described above, and the at least one battery cell is arranged in the module shell. Optionally, the battery module comprises a plurality of battery cells arranged in sequence along the thickness direction of the battery cells.

[0070] The pole group 2 of the battery cell of the battery module can be smoothly arranged in the shell, the first end surface 21 and the tab 22 of the pole group 2 are normal, the pole group 2 will not move in the vibration after the assembly is completed, the tab 22 will not be torn, the corner of the pole group 2 will not be crushed, and the battery cell has higher process yield and safety performance.

[0071] Obviously, the above-described embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or modifications can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An electric cell, characterized by, The application relates to a battery module, comprising: a shell; a pole group (2) arranged in the shell, the pole group (2) comprising a first end face (21); The insulating piece (3) is provided at the opening of the shell, has A protrusions (31) provided protruding towards the first end face (21), each of the protrusions (31) has a second end face (311) abutting against the first end face (21) to make the compression amount of the pole group (2) at the first end face (21) be H0, each of the protrusions (31) has a first inclined side face (312) provided inclined towards the first end face (21), the first inclined side face (312) and the inner wall of the shell together enclose a first avoiding space (100), the corner of the first end face (21) is located in the first avoiding space (100), the included angle between the first inclined side face (312) and the first end face (21) is an acute angle α, the height of the protrusion (31) along the direction perpendicular to the first end face (21) is H1, the sum of the areas of the second end faces (311) of the A protrusions (31) is S0, the length of the first end face (21) is L, and β = 90°-α, 2. The electric cell of claim 1, wherein, The sum S0 of the areas of the second end faces (311) of the A protrusions (31) satisfies: 500 mm 2 ≤ S0 ≤ 7000 mm 2 .

3. The electric cell of claim 1, wherein, an included angle alpha between the first inclined side face (312) and the first end face (21) satisfies 83 DEG <= alpha <= 87 DEG.

4. The electric cell of claim 1, wherein, a height H1 of the protruding part (31) in a direction perpendicular to the first end face (21) satisfies 5 mm <= H1 <= 8.5 mm.

5. The electric cell of claim 1, wherein, a compression amount H0 of the pole group (2) at the first end face (21) satisfies 1.5 mm <= H0 <= 2.5 mm.

6. The electric cell of claim 1, wherein, a length L of the first end face (21) satisfies 375 mm <= L <= 580 mm.

7. The cell of any of claims 1-6, wherein, the insulating part (3) has two protruding parts (31), the two protruding parts (31) are respectively arranged at two ends of the insulating part (3) in a length direction of the insulating part (3), and the first inclined side face (312) of the two protruding parts (31) is respectively a side face of the two ends of the insulating part (3) in the length direction of the insulating part (3).

8. The cell of any of claims 1-6, wherein, each first avoiding space (100) has two corner portions of the pole groups (2), and a minimum distance between each first inclined side face (312) and the two corner portions of the adjacent pole groups (2) is consistent.

9. The cell of any of claims 1-6, wherein, an edge of the second end face (311) is arranged as a chamfer (313); and / or, each protruding part (31) further has a second inclined side face, the second inclined side face is arranged to be inclined towards the first end face (21), the second inclined side face and an inner wall of the shell jointly form a second avoiding space, and an edge of the first end face (21) is at least partially located in the second avoiding space.

10. A battery module, characterized by The application further relates to a battery module, comprising a module shell and at least one battery cell as claimed in any one of claims 1-9, and the at least one battery cell is located in the module shell.

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