Battery cell

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery monomer, the battery monomer comprises a shell, a first protection sheet and a second insulation film, the shell comprises a first wall body and a second wall body which are oppositely arranged, the first wall body is provided with an anti-explosion valve, and the second wall body is provided with a pole, so that the safety of the battery monomer is improved, and the battery monomer is convenient to use. The first protection sheet covers one side, deviating from the second wall body, of the first wall body, a first avoiding hole is formed in the first protection sheet, the orthographic projection of the anti-explosion valve on the first protection sheet is located in the first avoiding hole, and the second insulation film at least covers other wall bodies, except the first wall body and the second wall body, of the shell; the probability that the first receding hole and the anti-explosion valve are staggered is reduced, and a powerful guarantee is provided for smooth explosion of the anti-explosion valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery monomer. BACKGROUND

[0002] The existing square battery monomer usually sets the pole and the explosion -proof valve on the same side, when the explosion -proof valve opens, the high -temperature high -pressure material in the battery monomer sprays from the explosion -proof valve, the high -temperature high -pressure material that sprays is easy to splash on the pole, there is bigger security risk.

[0003] In order to reduce the probability of the above -mentioned problem, when designing the battery, the pole electricity reservation space and the safety distance between the pole and the explosion -proof valve need to be considered on the same side of the battery monomer, improve the design difficulty of the battery monomer.In addition, the existing technology will be covered with insulating film on the outer wall of the battery monomer, to ensure that the explosion -proof valve can smoothly burst, usually the hole or thinning (hereinafter referred to as the avoidance area) is opened on the insulating film corresponding to the explosion -proof valve, but when the whole insulating film is covered on the outer wall of the battery monomer, the avoidance area and the explosion -proof valve are easy to dislocation, so that part of the explosion -proof valve is wrapped in the insulating film, reduce the explosion -proof valve's blast reliability.

[0004] Therefore, it is urgent to propose a kind of battery monomer to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of battery monomer, can reduce the probability that high -temperature high -pressure material that sprays from explosion -proof valve splashes on the pole, can reduce the design difficulty of the battery monomer, can also provide strong guarantee for the smooth burst of explosion -proof valve.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Battery monomer, comprising:

[0008] Shell, the shell includes oppositely arranged first wall body and second wall body, the first wall body is equipped with explosion -proof valve, and the second wall body is equipped with pole;

[0009] First protective sheet, first protective sheet covers the side of first wall body away from second wall body, first protective sheet is equipped with first avoidance hole, and the orthographic projection of explosion -proof valve on first protective sheet is located in first avoidance hole;

[0010] Second insulating film, second insulating film covers at least other wall body except first wall body and second wall body of shell.

[0011] Optionally, the battery monomer further comprises a pole group, a conductive adapter and a first insulating sheet arranged in the shell, the first insulating sheet is arranged between the pole group and the conductive adapter, the pole group is provided with a pole lug on a side facing the second wall body, the pole lug is arranged in the first insulating sheet and connected with the conductive adapter, and the pole column is arranged in the second wall body and connected with the conductive adapter.

[0012] Optionally, the first insulating sheet is provided with thickening portions on two opposite sides in the first direction, and the thickening portions protrude from a side surface of the first insulating sheet away from the pole group.

[0013] Optionally, the at least one thickening portion is provided with a hollow portion.

[0014] Optionally, the hollow portion penetrates the thickening portion in the first direction.

[0015] Optionally, the first insulating sheet is provided with a hollow area, the second wall body is provided with a first liquid injection hole, and the first liquid injection hole is arranged opposite to the hollow area.

[0016] And / or, the first insulating sheet is provided with a second liquid injection hole, the second wall body is provided with a first liquid injection hole, and the first liquid injection hole is arranged opposite to the second liquid injection hole.

[0017] Optionally, the thickness of the first protective sheet is 1mm-3mm, and the thickness of the second insulating film is 0.01mm-0.1mm.

[0018] Optionally, the first wall body is provided with a battery identification code on a side facing away from the second wall body, the first protective sheet is provided with a third avoiding hole corresponding to the position of the battery identification code, and the second wall body is provided with a first liquid injection hole.

[0019] Optionally, the shell comprises a shell body and a cover plate, the shell body is provided with an opening, the cover plate is arranged at the opening, and the cover plate is the second wall body.

[0020] Optionally, the cover plate is provided with a positive pole anti-fooling groove and a negative pole anti-fooling groove, the shape of the positive pole anti-fooling groove is different from that of the negative pole anti-fooling groove, the pole column comprises a positive pole column and a negative pole column, the bottom of the positive pole anti-fooling groove is provided with a positive pole assembly hole, the bottom of the negative pole anti-fooling groove is provided with a negative pole assembly hole, the positive pole column is arranged in the positive pole assembly hole, and the negative pole column is arranged in the negative pole assembly hole.

[0021] The beneficial effects of the utility model are as follows:

[0022] The battery monomer provided by the utility model has the first wall body and the second wall body oppositely arranged, the explosion-proof valve is arranged on the first wall body, the pole is arranged on the second wall body, the explosion-proof valve and the pole are arranged on the opposite sides of the shell, on one hand, the probability that the high-temperature and high-pressure material spouted from the explosion-proof valve splashes on the pole is reduced, and the safety of the battery monomer is improved; on the other hand, the safety distance between the pole and the explosion-proof valve is not considered when the battery monomer is designed, and therefore the design difficulty of the battery monomer is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the explosion structure schematic view of the battery monomer provided by the utility model;

[0024] Figure 2 It is the structure schematic view of the first wall body provided by the utility model;

[0025] Figure 3 It is the structure schematic view of the second wall body provided by the utility model;

[0026] Figure 4 It is the structure schematic view of the first protection piece provided by the utility model;

[0027] Figure 5 It is the structure schematic view of the battery monomer provided by the utility model;

[0028] Figure 6 It is the explosion structure schematic view of the pole and the first insulation piece provided by the utility model;

[0029] Figure 7 It is the structure schematic view of the first insulation piece provided by the utility model;

[0030] Figure 8 It is the structure schematic view of the second wall body provided by the utility model;

[0031] Figure 9 It is the structure schematic view of the second protection piece provided by the utility model;

[0032] Figure 10is a first assembly structure schematic view of the conductive adapter and the pole column provided by the utility model.

[0033] Figure 11 is a second assembly structure schematic view of the conductive adapter and the pole column provided by the utility model.

[0034] In the drawing,

[0035] D1, first direction, D2, second direction, D3, third direction,

[0036] 100, battery monomer,

[0037] 1, shell, 11, first wall body, 111, explosion-proof valve, 112, battery identification code, 12, second wall body, 121, pole column, 122, first liquid injection hole, 123, positive pole anti-fumble groove, 124, negative pole anti-fumble groove, 125, positive pole assembly hole, 126, negative pole assembly hole, 131, shell body, 132, cover plate, 21, first protective sheet, 211, first avoiding hole, 212, third avoiding hole, 22, second protective sheet, 221, positive pole anti-fumble hole, 222, negative pole anti-fumble hole, 223, second avoiding hole, 3, pole group, 31, pole lug, 4, conductive adapter, 41, first connecting part, 42, second connecting part, 43, third connecting part, 51, first insulating sheet, 511, first gap, 512, second gap, 513, hollow area, 514, second liquid injection hole, 515, thickened part, 516, hollow part, 517, support column, 52, second insulating sheet, 61, first insulating film, 611, pole group two-dimensional code, 62, second insulating film. DETAILED DESCRIPTION

[0038] The utility model will be further explained in detail below combining with the drawings and examples. It can be understood that the specific examples described here are only for explaining the utility model, and not for limiting the utility model. In addition, it should be noted that, for the convenience of description, only the part related to the utility model is shown in the drawings, not all the structures.

[0039] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0042] This embodiment provides a battery cell that can reduce the probability of high-temperature and high-pressure substances ejected from the explosion-proof valve splashing onto the terminal post, reduce the design difficulty of the battery, and provide strong protection for the successful explosion of the explosion-proof valve.

[0043] Specifically, such as Figures 1 to 4 As shown, the battery cell 100 includes a housing 1, a first protective sheet 21, and a second insulating film 62. The housing 1 includes a first wall 11 and a second wall 12 disposed opposite to each other. An explosion-proof valve 111 is provided on the first wall 11, and an electrode post 121 is provided on the second wall 12. The first protective sheet 21 covers the side of the first wall 11 away from the second wall 12. The first protective sheet 21 is provided with a first clearance hole 211. The orthogonal projection of the explosion-proof valve 111 on the first protective sheet 21 is located within the first clearance hole 211. The second insulating film 62 covers at least the other walls of the housing 1 except for the first wall 11 and the second wall 12.

[0044] Based on the above design, the shell 1 includes a first wall body 11 and a second wall body 12 arranged oppositely, the first wall body 11 is provided with the explosion-proof valve 111, and the second wall body 12 is provided with the pole 121, so that the explosion-proof valve 111 and the pole 121 are located on opposite sides of the shell 1, which reduces the probability of high-temperature and high-pressure substances sprayed from the explosion-proof valve 111 splashing onto the pole 121, and improves the safety of the battery monomer 100; on the other hand, the problem of considering the safety distance between the pole 121 and the explosion-proof valve 111 when designing the battery monomer is avoided, thereby reducing the design difficulty of the battery monomer. In addition, the battery monomer 100 further includes a first protective sheet 21 and a second insulating film 62, the first protective sheet 21 covers the side of the first wall body 11 away from the second wall body 12, and the first protective sheet 21 is provided with a first avoiding hole 211, the orthographic projection of the explosion-proof valve 111 on the first protective sheet 21 is located in the first avoiding hole 211, and the second insulating film 62 covers at least other wall bodies of the shell 1 except the first wall body 11 and the second wall body 12. Compared with using an entire second insulating film 62 to cover all wall bodies of the shell 1, the design of the first protective sheet 21 and the second insulating film 62 in a split type can reduce the probability of misalignment between the first avoiding hole 211 and the explosion-proof valve 111, and provide a strong guarantee for the smooth explosion of the explosion-proof valve 111, and improve the safety of the battery monomer 100.

[0045] Optionally, the first protective sheet 21 and the second insulating film 62 are both insulating materials, wherein the thickness of the first protective sheet 21 is 1mm-3mm, and the thickness of the second insulating film 62 is 0.01mm-0.1mm. For example, the thickness of the first protective sheet 21 can be 1mm, 1.5mm or 3mm, and the thickness of the second insulating film 62 can be 0.01mm, 0.05mm or 0.1mm. The thickness of the first protective sheet 21 is greater than that of the second insulating film 62, which can have better buffering performance and better protection for the first wall body 11.

[0046] In this embodiment, the shell 1 includes a shell body 131 and a cover plate 132, the shell body 131 is provided with an opening, and the cover plate 132 is sealed and covers the opening to form the shell 1. The cover plate 132 is the second wall body 12, and the side wall body of the shell body 131 opposite to the opening is the first wall body 11.

[0047] It should be noted that the second insulating film 62 can be a blue film or a black film. The thickness of the second insulating film 62 is 0.01mm-0.1mm. When covering the second insulating film 62, the starting part of the second insulating film 62 is attached to an outer surface (which can be a surface with a small area) of the shell body 131, and the top corner of the starting part is bent to form a triangular corner. Then, the second insulating film 62 is attached to the remaining outer surfaces of the electrode group 3 along the circumference of the shell body 131 until the end part of the second insulating film 62 is attached to the starting part of the second insulating film 62, thus completing the attachment of the second insulating film 62. The triangular bend at the apex of the starting portion of the second insulating film 62 facilitates quick and accurate location of the starting portion during application, allowing the end portion to be attached to the starting portion. Furthermore, wrinkles often appear at the apex of the starting portion, resulting in an uneven surface after the end portion is attached. The triangular bend at the apex of the starting portion avoids this problem, improving the flatness of the starting portion.

[0048] Furthermore, a second protective plate 22 is provided on the side of the cover plate 132 facing away from the shell body 131. That is, a second protective plate is provided on the side of the second wall 12 facing away from the first wall 11, and the pole post 121 passes through the second protective plate 22 to achieve insulation protection for the side of the cover plate 132 facing away from the shell body 131. In other embodiments, a second insulating film 62 can also be used to cover the cover plate 132 simultaneously.

[0049] Furthermore, the first protective piece 21 is attached to the side of the first wall 11 opposite to the second wall 12, and the second protective piece 22 is attached to the side of the second wall 12 opposite to the first wall 11, so as to fix the first protective piece 21 and the second protective piece 22.

[0050] Optionally, the side of the first wall 11 facing away from the second wall 12 is provided with a battery identification code 112 for recording information of the battery cell 100, such as... Figure 4 As shown, a third clearance hole 212 is provided on the first protective plate 21 at the position corresponding to the battery identification code 112. The shape of the third clearance hole 212 is adapted to the shape of the battery cell QR code to facilitate scanning the battery cell QR code.

[0051] Furthermore, such as Figure 8 As shown, the second wall 12 is provided with a first liquid injection hole 122, that is, the first liquid injection hole 122 and the battery identification code 112 are located on the second wall 12 and the first wall 11 respectively. Thus, when electrolyte is injected into the housing 1 through the first liquid injection hole 122, the problem of electrolyte overflow corroding the battery identification code 112 can be avoided.

[0052] Optionally, the first wall 11 and the second wall 12 are both sidewalls of the shell 1, or as shown in the image.Figure 5 As shown, the battery monomer 100 is placed vertically, so when the explosion-proof valve 111 is opened, the high-temperature and high-pressure substance in the shell 1 can be sprayed from the side of the shell 1, and when the installation space of the battery monomer 100 is limited in height (for example, on the body of an electric vehicle), compared with the high-temperature and high-pressure substance sprayed from the top of the shell 1, the structure of the high-temperature and high-pressure substance sprayed from the side of the shell 1 has higher safety. And because the explosion-proof valve 111 is located on the side wall of the shell 1, in the height direction of the battery monomer 100, the spraying space of the high-temperature and high-pressure substance is saved, and the size of the pole group 3 in this direction can be increased, achieving the effect of increasing the volume of the pole group 3, and ultimately achieving the effect of improving the energy density of the battery monomer 100.

[0053] Optionally, as shown in Figure 1 The battery monomer 100 further comprises a pole group 3 and a conductive adapter 4, both of which are arranged in the shell 1, the pole group 3 is provided with a pole lug 31 on the side facing the second wall 12, the pole lug 31 is connected with the conductive adapter 4, and the pole lug 31 is connected with the pole column 121 through the conductive adapter 4.

[0054] Further, the battery monomer 100 further comprises a first insulating sheet 51, which is clamped between the pole group 3 and the conductive adapter 4, and the pole lug 31 is arranged in the first insulating sheet 51 and connected with the conductive adapter 4, so as to realize the insulation between the conductive adapter 4 and the pole group 3.

[0055] Further, as shown in Figure 6 The side wall of the first insulating sheet 51 is provided with a notch, and the pole lug 31 is arranged in the notch. Compared with the design of opening a through hole in the first insulating sheet 51, and arranging the pole lug 31 in the through hole and connecting it with the conductive adapter 4, the design of opening a notch in the side wall of the first insulating sheet 51 and arranging the pole lug 31 in the notch and connecting it with the conductive adapter 4 has the effect of reducing the assembly difficulty of the pole lug 31, the first insulating sheet 51 and the conductive adapter 4.

[0056] Further, as shown in Figure 6 and Figure 7As shown, the number of the tab 31 is two, the two tabs 31 are arranged in the first direction D1, one of the two tabs 31 is a positive tab, and the other is a negative tab, the number of the pole group 3 is two or more, and the two or more pole groups 3 are arranged in the second direction D2 in turn, and the second direction D2 is perpendicular to the first direction D1; the notch includes two first notches 511 and two second notches 512, the two first notches 511 are arranged in the first direction D1, and each first notch 511 is arranged opposite to a corresponding second notch 512 in the second direction D2, so that the first insulating sheet 51 is approximately in the shape of a "king" character; among the two or more pole groups 3, the two tabs 31 of at least one pole group 3 are respectively arranged in a corresponding first notch 511, and the two tabs 31 of the remaining pole groups 3 are respectively arranged in a corresponding second notch 512. This structure is simple in design and can reduce the assembly difficulty of the two tabs 31 of each pole group 3, the conductive adapter 4 and the first insulating sheet 51.

[0057] In this embodiment, the number of the pole group 3 is two, and of course in other embodiments, the number of the pole group 3 can also be three, four or five. And, a corresponding through hole can be provided on the first insulating sheet 51 for the tab to pass through.

[0058] Optionally, the tab 31 includes a first tab portion, a second tab portion, and a bending portion (not shown in the figure), the first tab portion and the second tab portion are connected through the bending portion, the first tab portion is connected with the pole group 3 and arranged in the notch, and the second tab portion is connected with the side of the conductive adapter 4 away from the first insulating sheet 51. This structure design can expand the connection area of the tab 31 and the conductive adapter, thereby improving the stability and reliability of the connection between the tab 31 and the conductive adapter.

[0059] Further, as shown, Figure 1 The battery monomer 100 also includes a second insulating sheet 52, the second insulating sheet 52 covers the side of the first tab portion away from the conductive adapter 4, the side of the second tab portion away from the conductive adapter 4, and the side of the bending portion away from the conductive adapter 4, that is, the second insulating sheet 52 is approximately in the shape of an "L" character, so as to realize the insulation between the tab 31 and other components in the shell 1. Further, the second insulating sheet 52 is adhesively fixed on the side of the first tab portion away from the conductive adapter 4, the side of the second tab portion away from the conductive adapter 4, and the side of the bending portion away from the conductive adapter 4.

[0060] Further, the number of the pole 121, the conductive adapter 4 and the second insulating sheet 52 is two and one-to-one correspondence, one of the two poles 121 is a positive pole, and the positive pole corresponds to a positive tab, and the other is a negative pole, and the negative pole corresponds to a negative tab. The conductive adapter 4 corresponding to the positive pole is made of aluminum material, and the conductive adapter 4 corresponding to the negative pole is made of copper material.

[0061] Further, as shown in Figure 8 the second wall body 12 (i.e. the cover plate 132) is provided with a positive foolproof groove 123 and a negative foolproof groove 124, the shape of the positive foolproof groove 123 is different from that of the negative foolproof groove 124 (for example, part of the inner wall of the positive foolproof groove 123 protrudes in a direction away from the axis of the positive foolproof groove 123, and part of the inner wall of the negative foolproof groove 124 protrudes in a direction close to the axis of the negative foolproof groove 124), and the bottom of the positive foolproof groove 123 is provided with a positive identification, and the periphery of the negative foolproof groove 124 is provided with a negative identification, the bottom of the positive foolproof groove 123 is provided with a positive assembly hole 125, and the bottom of the negative foolproof groove 124 is provided with a negative assembly hole 126, the positive assembly hole 125, the negative assembly hole 126, the positive pole and the negative pole are substantially in the shape of a racetrack, the positive pole is inserted and fixed in the positive assembly hole 125, and the negative pole is inserted and fixed in the negative assembly hole 126, the design of the positive foolproof groove 123 and the negative foolproof groove 124 facilitates quick identification of the positive and negative poles of the battery monomer 100 during assembly.

[0062] As shown in Figure 9 the second protective sheet 22 is provided with a positive foolproof hole 221 and a negative foolproof hole 222, the positive foolproof hole 221 is arranged opposite to the positive foolproof groove 123 and has the same shape as the positive foolproof groove 123, and the negative foolproof hole 222 is arranged opposite to the negative foolproof groove 124 and has the same shape as the negative foolproof groove 124.

[0063] Optionally, as shown in Figure 7 and Figure 8 the first insulating sheet 51 is provided with a second liquid injection hole 514, and the second wall body 12 is provided with a first liquid injection hole 122, the first liquid injection hole 122 is arranged opposite to the second liquid injection hole 514, and after the assembly of the pole group 3, the first insulating sheet 51 and the shell 1 and other components is completed, electrolyte can be injected into the shell 1 through the first liquid injection hole 122 and the second liquid injection hole 514.

[0064] Further, the first insulating sheet 51 is provided with a hollow area 513, and the first liquid injection hole 122 is arranged opposite to the hollow area 513, that is, the second liquid injection hole 514 is arranged in the hollow area 513, and the design of the hollow area 513 improves the efficiency of electrolyte injection, thereby improving the production efficiency. Of course, in other embodiments, the first insulating sheet 51 can be provided with one of the second liquid injection hole 514 and the hollow area 513, which can be determined according to actual application requirements.

[0065] Optionally, as shown in Figure 7As shown, the first insulating sheet 51 has thickened portions 515 on both opposite sides in the first direction D1. That is, in the third direction D3, the size of the thickened portions 515 is larger than the size of the other parts of the first insulating sheet 51, and the thickened portions 515 protrude from the surface of the first insulating sheet 51 facing away from the electrode assembly 3. This allows them to provide insulation and limit the tab 31 in the first direction D1, preventing the tab 31 from contacting the wall of the housing 11 in the first direction D1. The thickened portions 515 can also abut against the second wall 12, forming a space to accommodate the tab 31 and the conductive adapter 4, avoiding compression of the tab 31 and the conductive adapter 4. A plastic component can also be provided below the second wall 12, through which the thickened portions 515 indirectly abut against the second wall 12.

[0066] Furthermore, the thickened portion 515 is provided with a hollow portion 516 to reduce the weight of the thickened portion 515. In this embodiment, the thickened portions 515 on both sides of the first direction D1 are provided with hollow portions 516. In other embodiments, the thickened portion 515 on one side of the first direction D1 may also be provided with a hollow portion 516.

[0067] Furthermore, the hollow portion 516 penetrates the thickened portion 515 along the first direction D1. The design of the hollow portion 516 increases the flow channel of gas inside the shell, especially realizing the flow of gas inside the shell in the first direction D1. This is beneficial for the gas between the electrode group 3 and the second wall 12 to flow through the hollow portion 516 to the explosion-proof valve 111, which is beneficial for the explosion-proof valve 111 to explode when the battery cell thermally runs away.

[0068] Furthermore, the thickened portion 515 is provided with several support columns 517 extending along the third direction D3 to improve the structural strength of the thickened portion 515.

[0069] Optionally, such as Figure 9 As shown, the second protective sheet 22 is provided with a second clearance hole 223, which is positioned directly opposite the first injection hole 122. This allows the second protective sheet 22 to be attached to the second wall 12 before injecting electrolyte into the housing 1, thus avoiding the problem of residual electrolyte corroding the surface of the second wall 12. The battery cell 100 also includes a sealing element. After the electrolyte is injected, the sealing element is inserted into the first injection hole 122 to seal the first injection hole 122.

[0070] In this embodiment, the electrode assembly 3 is a stacked electrode assembly, comprising multiple positive electrode plates, multiple negative electrode plates, and multiple separators. The positive and negative electrode plates are stacked alternately, and a separator is sandwiched between the positive and negative electrode plates. Of course, in other embodiments, the electrode assembly 3 can also be a wound electrode assembly or other forms. In this embodiment, the second insulating sheet 52 attached to the first electrode tab extends toward the electrode assembly 3 and is bonded and fixed to the separator.

[0071] Optionally, as shown in Figure 10 and Figure 11 , the conductive adapter 4 includes a first connecting part 41, a second connecting part 42 and a third connecting part 43, wherein the first connecting part 41 and the second connecting part 42 are symmetrically arranged on the opposite sides of the third connecting part 43 and are connected with the third connecting part 43, and the pole 121 is connected with the third connecting part 43, as shown in Figure 1 , Figure 6 and Figure 10 , the first connecting part 41 and the second connecting part 42 correspond to the tabs 31 on the opposite sides of the first insulating sheet 51 in the second direction D2 respectively. In addition, in the embodiment, the first connecting part 41 and the second connecting part 42 are both welded and fixed with the tabs 31, so that the thicknesses of the first connecting part 41 and the second connecting part 42 are both greater than the thickness of the third connecting part 43, and the surfaces of the first connecting part 41 and the second connecting part 42 are both frosted surfaces to improve the welding strength of the first connecting part 41 and the second connecting part 42 with the tabs 31.

[0072] As shown in Figure 1 , the battery monomer 100 further includes a first insulating film 61, among the plurality of side walls of the pole group 3, the side wall provided with the tab 31 is not covered by the first insulating film 61, and the rest of the side walls are all covered by the first insulating film 61, so as to realize the insulation between the pole group 3 and the shell 1, and also can play a protective role for the pole group 3, avoiding the problem that the pole group 3 is scratched when the pole group 3 is assembled into the shell 1.

[0073] Further, the first insulating film 61 is provided with a pole group two-dimensional code 611 recording the information of the pole group 3.

[0074] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, can make various obvious changes, re-adjustment and replacement without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery cell, characterized by The battery cell (100) comprises a shell (1), a first protective sheet (21), a second insulating film (62), a first insulating sheet (51), a pole group (3), and a conductive adapter (4). The shell (1) comprises oppositely arranged first and second wall bodies (11 and 12), the first wall body (11) is provided with an explosion-proof valve (111), and the second wall body (12) is provided with a pole post (121). The first protective sheet (21) covers the side of the first wall body (11) away from the second wall body (12), and the first protective sheet (21) is provided with a first avoidance hole (211), and the orthographic projection of the explosion-proof valve (111) on the first protective sheet (21) is located in the first avoidance hole (211). The second insulating film (62) covers at least the wall bodies of the shell (1) other than the first and second wall bodies (11 and 12).

2. The battery cell of claim 1, wherein, The battery cell (100) further comprises a pole group (3), a conductive adapter (4), and a first insulating sheet (51) arranged in the shell (1), the first insulating sheet (51) is arranged between the pole group (3) and the conductive adapter (4), one side of the pole group (3) away from the second wall body (12) is provided with a pole lug (31), the pole lug (31) penetrates the first insulating sheet (51) and is connected with the conductive adapter (4), and the pole post (121) penetrates the second wall body (12) and is connected with the conductive adapter (4).

3. The battery cell of claim 2, wherein, The first insulating sheet (51) is provided with thickening portions (515) on opposite sides in a first direction (D1), and the thickening portions (515) protrude from the side surface of the first insulating sheet (51) away from the pole group (3).

4. The battery cell of claim 3, wherein, At least one of the thickening portions (515) is provided with a hollow portion (516).

5. The battery cell of claim 4, wherein, The hollow portion (516) penetrates the thickening portion (515) along the first direction (D1).

6. The battery cell of claim 2, wherein, The first insulating sheet (51) is provided with a hollow area (513), and the second wall body (12) is provided with a first liquid injection hole (122) arranged opposite to the hollow area (513). The first insulating sheet (51) is provided with a second liquid injection hole (514), and the second wall body (12) is provided with a first liquid injection hole (122) arranged opposite to the second liquid injection hole (514).

7. The battery cell of claim 1, wherein, The thickness of the first protective sheet (21) is 1-3 mm, and the thickness of the second insulating film (62) is 0.01-0.1 mm.

8. The battery cell of claim 1, wherein, The side of the first wall body (11) away from the second wall body (12) is provided with a battery identification code (112), the first protective sheet (21) is provided with a third avoidance hole (212) corresponding to the position of the battery identification code (112), and the second wall body (12) is provided with a first liquid injection hole (122).

9. The battery cell of claim 1, wherein, The shell (1) comprises a shell body (131) and a cover plate (132), the shell body (131) is provided with an opening, the cover plate (132) is arranged at the opening, and the cover plate (132) is the second wall body (12).

10. The battery cell of claim 9, wherein, The cover plate is provided with a positive foolproof groove (123) and a negative foolproof groove (124), the shape of the positive foolproof groove (123) is different from the shape of the negative foolproof groove (124), the pole (121) comprises a positive pole and a negative pole, the bottom of the positive foolproof groove (123) is provided with a positive assembly hole (125), the bottom of the negative foolproof groove (124) is provided with a negative assembly hole (126), the positive pole is arranged in the positive assembly hole (125), and the negative pole is arranged in the negative assembly hole (126).

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