Battery monomer and electric equipment

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery monomer, electric equipment and an end cover assembly, which comprises an end cover, an insulating plate and a pole, the electrode assembly comprises a main body and a tab protruding out of the main body; the switching piece is connected with the pole lug and the pole column; a limiting piece is arranged on at least one side, in the width direction of the end cover, of the switching piece, and the limiting piece is connected to one side, deviating from the end cover, of the insulating plate; in the thickness direction of the end cover, the distance between the surface, facing the body, of the limiting piece and the body is a first distance a, the distance between the surface, deviating from the body, of the switching piece and the body is a second distance b, and the first distance a is smaller than the second distance b. By arranging the limiting piece on the insulating plate to limit the switching piece, the switching piece and the tab can be welded, so that the switching piece is not easy to move, the welding quality is improved, the switching piece can be ensured to be always in the range of the insulating plate during mounting, the mounting is convenient, and the yield is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery field especially relates to a battery monomer and electric equipment. BACKGROUND

[0002] In prior art, the pole lug of the battery cell and the pole column on the cover plate need to be electrically connected, so when the lithium ion battery is produced, the pole lug of the battery cell and the adapter piece are welded first, and then the adapter piece and the pole column on the cover plate are welded, but since the pole lug of the battery cell has a certain length and is flexible, if the adapter piece and the pole column are welded by positioning the adapter piece and the pole column with the main body of the battery cell, the adapter piece may exceed the range of the plastic or the cover plate after welding, so that the cover plate cannot be sealed and installed on the shell subsequently. SUMMARY

[0003] The battery monomer and electric equipment provided by the embodiment of the utility model solve at least the problem that the adapter piece is easy to move and the welding quality is poor and the yield is low in the prior art.

[0004] In a first aspect, the utility model provides a battery monomer, including: the end cover subassembly, including end cover, insulating plate and pole column, the pole column sets up in the end cover, the insulating plate is connected to the end cover, and the insulating plate is set on the pole column, electrode subassembly, including main body and the pole lug of protruding in the main body, the pole lug is located between the main body and the insulating plate, adapter piece, connects the pole lug and the pole column, wherein at least one side of the adapter piece along the first direction is provided with a limiting piece, the limiting piece is connected to the side of the insulating plate away from the end cover, in the second direction, the distance between the surface of the main body to the main body of the limiting piece is the first distance a, the distance between the surface of the main body to the main body of the adapter piece is the second distance b, the first distance a is less than the second distance b, the second direction is the thickness direction of the end cover, and the first direction is the width direction of the end cover.

[0005] In an embodiment of the utility model, the adapter piece and the limiting piece abut.

[0006] In an embodiment of the utility model, the adapter piece is provided with two, two the adapter piece polarity is opposite, and two the adapter piece is spaced apart along the third direction;At least one side of two the adapter piece along the first direction is provided with a limiting piece, and the third direction is the length direction of the end cover.

[0007] In one embodiment of the utility model, the sum of the size of the limiting piece and the adapter piece in the first direction is not more than the size of the insulating plate in the first direction, and / or the size of the limiting piece in the third direction is not more than the size of the adapter piece in the third direction, and / or the size of the limiting piece in the third direction is 20mm to 80mm, the size of the limiting piece in the first direction is 5mm to 10mm, and the third direction is the length direction of the end cover.

[0008] In one embodiment of the utility model, the insulating plate is provided with a liquid injection hole, the liquid injection hole is located between the exhaust structure provided on the turnover plate and the liquid injection mounting hole provided on the end cover, the liquid injection mounting hole is a through hole provided on the end cover corresponding to the position of the liquid injection hole and penetrating the liquid injection hole, the tab includes a first connecting part and a bending part connected in sequence, the end cover assembly further includes a turnover plate, the first connecting part is connected with the adapter piece, and both the first connecting part and the adapter piece are located between the insulating plate and the turnover plate, one end of the turnover plate along the third direction is foldably connected with the insulating plate, the third direction is the length direction of the end cover, wherein the bending part is located on one side of the turnover plate along the first direction, and the limiting piece is arranged between one end of the turnover plate away from the bending part and the insulating plate, and the limiting piece and the turnover plate abut.

[0009] In one embodiment of the utility model, the limiting piece is provided with a first buckle, the turnover plate is provided with a second buckle corresponding to the first buckle, and the first buckle and the second buckle are clamped.

[0010] In one embodiment of the utility model, one end of the turnover plate away from the bending part of the tab is provided as a thickened part, the thickened part abuts against the limiting piece, and the thickened part abuts against the main body.

[0011] In one embodiment of the utility model, the insulating plate is provided with a liquid injection hole, the liquid injection hole is located between the exhaust structure provided on the turnover plate and the liquid injection mounting hole provided on the end cover, the liquid injection mounting hole is a through hole provided on the end cover corresponding to the position of the liquid injection hole and penetrating the liquid injection hole, the tab includes a first connecting part and a bending part connected in sequence, the first connecting part of the tab is connected with the adapter piece, wherein the liquid injection hole is located on the side of the first connecting part away from the bending part, in the first direction, the distance between the liquid injection hole and the side edge of the insulating plate close to the bending part is a third distance c, the distance between the liquid injection hole and the side edge of the insulating plate away from the bending part is a fourth distance d, the third distance c is greater than the fourth distance d, and 10mm≤c≤55mm, 5mm≤d≤25mm.

[0012] In one embodiment of this utility model, the injection hole is located between the venting structure and the adapter plate; in the third direction, the distance between the injection hole and the adapter plate is a fifth distance L, 6mm≤L≤13mm.

[0013] Secondly, this utility model also provides an electrical device, including the aforementioned battery cell.

[0014] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0015] The battery cell and electrical equipment of this utility model limit the position of the adapter piece by setting a limiting member on at least one side of the adapter piece on the insulating plate. This prevents the adapter piece from going beyond the edge of the insulating plate during welding, avoids poor welding quality, and improves the yield rate. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of a battery cell assembly structure in an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Side view;

[0019] Figure 3 This is a schematic diagram of the structure of the battery cell after assembly in an embodiment of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of a battery cell after assembly of another flip plate in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the plastic material in the relevant technology;

[0022] Figure 6 This is a schematic diagram of the structure of the lower plastic in an embodiment of this utility model;

[0023] Figure 7 This is a schematic diagram of the lower plastic structure of a battery cell in an embodiment of this utility model;

[0024] Figure 8 This is a schematic diagram showing the interference between the adapter plate and the pre-welding limiting component and the adapter plate in this utility model.

[0025] The above figures include the following reference numerals:

[0026] 1 - end cover; 2 - insulating plate; 21 - turnover plate; 23 - exhaust structure; 3 - pole; 4 - adapter piece; 5 - tab; 51 - first connecting part; 52 - bending part; 53 - thickening part; 6 - limiting piece; 7 - liquid injection hole; 71 - liquid leakage structure; 81 - first buckle; 82 - second buckle; 83 - third buckle; 84 - fourth buckle; 9 - explosion-proof valve piece; 10 - main body. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0029] Unless specifically stated otherwise, the relative arrangement of parts and steps illustrated in these embodiments and the numerical expressions and values are not limiting of the scope of the utility model. At the same time, it should be understood that the size of each part shown in the drawings is not drawn in proportion. The technology, method and equipment known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] As shown in Figure 1 and Figure 2 , it is the state of the end cover assembly and the main body 10 of the electrode assembly without being folded relative to each other, and it is also the placement state of the adapter piece 4 and the pole 3 in the end cover assembly after welding in the battery monomer production process, wherein the pole 3 is welded with the adapter piece 4, and the tab 5 of the electrode assembly is welded with the adapter piece 4.

[0031] As shown in Figure 3 and Figure 4 , it is the state of the end cover assembly and the main body 10 of the electrode assembly after being folded relative to each other, that is, the relative position of the end cover assembly and the main body 10 of the electrode assembly in the battery monomer.

[0032] The utility model provides a kind of battery monomer, comprising: end cover assembly, electrode assembly, adapter sheet and shell.

[0033] End cover assembly can include end cover 1, insulating plate 2 and pole 3, the effect of end cover 1 is that the opening of shell is blocked, to make end cover 1 and shell have the space that can accommodate electrode assembly.

[0034] The above-mentioned insulating plate 2 is connected to end cover 1, specifically, insulating plate 2 is arranged at the side of end cover 1 close to main body 10, and generally has the effect of isolating main body 10 and end cover 1 of electrode assembly.Usually can be plastic material, so it can also be called lower plastic part, or lower plastic plate.

[0035] Since pole 3 needs to be electrically connected with the tab 5 of electrode assembly, when pole 3 is arranged on end cover 1, pole mounting hole needs to be arranged on end cover 1, so that the tab 5 of electrode assembly can be electrically connected through pole mounting hole and pole 3.It is preferred that pole 3 and pole mounting hole form a plug-in fit, so that end cover 1 can be sleeved on pole 3;Correspondingly, in order to avoid the influence of insulating plate 2 on the electrical connection of tab 5 and pole 3, the insulating plate 2 is provided with a relief through hole at the position corresponding to the pole mounting hole, and it is preferred that the relief through hole of the insulating plate 2 and the pole 3 form a plug-in fit, so that the insulating plate 2 can be sleeved on the pole 3.

[0036] For the above-mentioned electrode assembly, it can include main body 10 and tab 5 protruding from main body 10.Tab 5 is usually bendable, and tab 5 is led out from the main body 10 of electrode assembly.

[0037] In the prior art, when adapter sheet 4 and pole 3 need to be welded, end cover assembly and main body 10 of electrode assembly are generally placed in the relative position as shown in Figure 1 And Figure 2 At this time, the tab 5 of electrode assembly is in a natural straight state, and the end face of end cover and main body 10 leading out tab 5 of electrode assembly is arranged perpendicular to each other, so that the inventor finds that if the relative position between main body 10 of electrode assembly and end cover assembly is used as the welding position of tab 5 and pole 3, there will be a problem that adapter sheet 4 may exceed the range of lower plastic or cover plate after welding of adapter sheet 4 and pole 3 is completed, which further makes the cover plate unable to be sealed and installed on the shell subsequently.

[0038] To this end, the embodiment proposes that at least one side of the adapter piece 4 in the first direction is provided with a limiting piece 6, and the limiting piece 6 is connected to the side of the insulating plate 2 away from the end cover 1; in the second direction, the distance between the surface of the main body 10 and the limiting piece 6 is a first distance a, and the distance between the surface of the main body 10 and the adapter piece 4 away from the main body 10 is a second distance b, the first distance a is less than the second distance b, and the second direction is the thickness direction of the end cover 1, and the first direction is the width direction of the end cover 1.

[0039] At the adapter piece 4 and the pole 3 welding station, on the basis that the relative position of the end cover assembly and the main body 10 of the electrode assembly has been determined, since the first distance a is less than the second distance b, that is, the limiting piece 6 protrudes from the side of the pole 3 in contact with the adapter piece 4, therefore, if there is a risk that the adapter piece 4 exceeds the insulating plate 2, the adapter piece 4 will first contact the limiting piece 6 when the adapter piece 4 and the pole 3 are pressed down for welding (see Figure 8 Therefore, whether the limiting piece 6 and the adapter piece 4 interfere can be used to determine whether there is a risk that the adapter piece 4 exceeds the insulating plate 2, thereby avoiding the problem that the adapter piece 4 exceeds the insulating plate 2 is found only at the end of welding, facilitating timely correction of the welding position of the adapter piece 4 and the pole 2, and avoiding waste of materials.

[0040] It should be noted that the limiting piece 6 can be provided on any one side of the adapter piece 4 in the first direction, or the limiting piece 6 can be provided on both sides of the adapter piece 4 in the first direction. It should also be noted that the limiting piece 6 can be connected to the insulating plate 2 by clamping or gluing, or the limiting piece 6 and the insulating plate 2 can be integrally formed for easy manufacturing, so that the limiting piece 6 is also manufactured at the same time as the insulating plate 2 by injection molding. Of course, the limiting piece 6 can be a structure fixed on the end cover 1, but since the material of the end cover 1 is generally metal, in order to avoid the problem of short circuit, an insulating layer can be provided on the limiting piece 6.

[0041] In addition, it should be noted that in order to avoid the setting of the limiting piece 6 affecting the closing of the end cover and the shell, the sum of the sizes of the limiting piece 6 and the adapter piece 4 in the first direction does not exceed the size of the insulating plate 2 in the first direction.

[0042] In some optional embodiments, as shown in Figures 3-4 The adapter piece 4 and the limiting piece 6 abut.

[0043] It can be understood that in the first direction, the adapter piece 4 and the limiting piece 6 abut, that is, at the adapter piece 4 and the pole 3 welding station, on the basis that the relative position of the end cover assembly and the main body 10 of the electrode assembly has been determined, the welding position of the adapter piece 4 and the pole 3 can be further positioned by the abutment of the adapter piece 4 and the limiting piece 6 in the first direction, thereby ensuring that the adapter piece 4 does not exceed the insulating plate 2.

[0044] It should be noted that since positioning can be achieved as long as the adapter piece 4 and the limiting piece 6 abut, the limiting piece 6 can be arranged on one side of the adapter piece 4 in the first direction, and the limiting piece 6 and the bent part 52 of the tab 5 are located on the same side; or the limiting piece 6 can be arranged on one side of the adapter piece 4 in the first direction, and the limiting piece 6 and the bent part 52 of the tab 5 are located on both sides along the first direction; of course, the limiting piece 6 can also be arranged on both sides of the adapter piece 4 along the first direction, and the two ends of the adapter piece 4 along the first direction abut the two limiting pieces 6, respectively.

[0045] In some optional embodiments, the tab 5 is provided with two, the polarities of the two tabs 5 are opposite and are arranged at intervals along the third direction, and the two tabs 5 are both led out from the main body 10; the end cover is provided with two polar opposite polar posts 5, and the two polar posts 5 are arranged at intervals along the third direction. Preferably, the two polar posts 5 are both insulated from the end cover 1. In order to connect the tab 5 and the polar post 5 corresponding in polarity, the adapter piece 4 is provided with two, the two adapter pieces 4 are arranged at intervals along the third direction, that is, the positive polarity tab 5 is connected through the positive polarity adapter piece 4 and the positive polarity polar post 5, and the negative polarity tab 5 is connected through the negative polarity adapter piece 4 and the negative polarity polar post 5, wherein the third direction is the length direction of the end cover 1.

[0046] In this way, in order to ensure that the limiting piece 6 can limit the two adapter pieces 4, the limiting piece 6 can be designed to be arranged on at least one side of the two adapter pieces 4 along the first direction.

[0047] It can be understood that the limiting piece 6 can limit the positive polarity adapter piece 4, or the negative polarity adapter piece 4, that is, the length of the limiting piece 6 along the third direction is at least greater than the interval distance between the two adapter pieces 4.

[0048] In this embodiment, the positioning of the two adapter pieces 4 is achieved by one limiting piece 6, simplifying the positioning process before the adapter piece 4 and the polar post 3 are welded.

[0049] In some other optional embodiments, the adapter piece 4 is provided with two, the two adapter pieces 4 are arranged at intervals along the third direction, and the limiting piece 6 is arranged on at least one side of each adapter piece 4 along the first direction.

[0050] It can be understood that the first case is that the limiting member 6 located at one side of the positive polarity adapter piece 4 and the limiting member 6 located at one side of the negative polarity adapter piece 4 are arranged on the same side; the second case is that the limiting member 6 located at one side of the positive polarity adapter piece 4 and the limiting member 6 located at one side of the negative polarity adapter piece 4 are arranged on different sides, respectively on the two sides along the first direction; and the third case is that the limiting member 6 is arranged on both sides of the positive polarity adapter piece 4, and the limiting member 6 is arranged on both sides of the negative polarity adapter piece 4.

[0051] It should be noted that when the limiting member 6 is arranged on at least one side of each adapter piece 4 along the first direction, the number of limiting members 6 arranged on any one side of the adapter piece 4 along the first direction is not limited, and can be one or two or three arranged at intervals.

[0052] It should be further noted that when the limiting member 6 is arranged on at least one side of each adapter piece 4 along the first direction, the size of the limiting member 6 in the third direction is not more than the size of the adapter piece 4 in the third direction, in order to avoid excessive length of the limiting member 6, causing waste of raw materials.

[0053] In some optional embodiments, considering that the existing square lithium ion battery monomer for electric vehicles has a length of 100-500mm, a width of 50-200mm, and a height of 10-100mm.

[0054] The size of the limiting member 6 in the third direction of the present embodiment is 20-80mm; and the size of the limiting member 6 in the first direction is 5-10mm. The adapter piece 4 can be effectively limited without affecting other components, specifically, the size of the limiting member 6 in the third direction can be 20mm, 30mm, 40mm, 50mm, 60mm, 70mm or 80mm; and the size of the limiting member 6 in the first direction can be 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0055] In some optional embodiments, in order to prevent the tab 5 from being inserted into the inside of the electrode assembly in reverse, as shown in Figure 3 and Figure 4 The tab 5 includes a first connecting portion 51 and a bending portion 52 connected in sequence, and the first connecting portion 51 of the tab 5 is connected with the adapter piece 4. As shown in Figures 5-7 The end cover assembly further includes a turnover plate 21, one end of the turnover plate 21 along the third direction is reversibly connected with the insulating plate 2, and the first connecting portion 51 of the tab 5 and the adapter piece 4 are both located between the insulating plate 2 and the turnover plate 21.

[0056] In this embodiment, the tab 5 can be bent around the turnover plate 21, so that the tab 5 can be guided to bend between the turnover plate 21 and the insulating plate 2 through the turnover plate 21 when the tab 5 is bent, thereby preventing the tab 5 from being inserted into the interior of the electrode assembly in reverse, and preventing the tab 5 from being inserted into the interior of the electrode assembly in reverse by maintaining the bent state of the tab 5 after the bending of the tab 5 is completed.

[0057] Further, when only one electrode assembly is arranged in the shell, in order to prevent the end cover assembly from tilting downward, the limiting member 6 is arranged between the end of the turnover plate 21 away from the bent portion 52 and the insulating plate 2, and the limiting member 6 and the turnover plate 21 abut.

[0058] In this embodiment, when only one electrode assembly is arranged in the shell, in the first direction, the bent portion 52 of the tab 5 at one side of the main body 10 can support the end cover assembly, and the limiting member 6 at the other side of the main body 10 can support the turnover plate 21, thereby supporting the end cover assembly, so that the problem of the end cover assembly tilting downward when the end cover assembly and the shell are closed is solved.

[0059] It should be noted that, as shown in Figure 4 , the tab 5 also includes a root portion connected to the bent portion 52, and when only one electrode assembly is arranged in the shell, the end of the turnover plate 21 along the first direction is located between the first connecting portion 51 and the root portion of the tab 5. Therefore, the other end of the turnover plate 21 along the first direction has a spacing from the end surface of the main body 10 from which the tab 5 is led out, so that if the end of the turnover plate 21 between the first connecting portion 51 and the root portion of the tab 5 is tilted, the end cover assembly will be tilted. Therefore, the end of the turnover plate 21 away from the bent portion 52 of the tab 5 is designed as a thickened portion 53, so that after the end cover assembly and the shell are closed, the thickened portion 53 abuts against the limiting member 6, and the thickened portion 53 abuts against the main body 10. Not only can the limiting member 6 limit the position of the adapter plate 4, but also the position of the main body 10 relative to the insulating plate 2 and the adapter plate 4 can be fixed.

[0060] Further, in order to detachably connect the turnover plate 21 and the insulating plate 2, as shown in Figure 5 , although in the related art, the insulating plate 2 is provided with an exhaust structure 23 corresponding to the explosion-proof valve plate 9, and the insulating plate 2 is provided with a fourth buckle 84 on both sides of the exhaust structure 23, and the end of the turnover plate 21 along the third direction is provided with a third buckle 83 for buckling with the fourth buckle 84. However, in order to simplify the structure of the insulating plate 2, as shown in Figure 6 , the limiting member 6 is designed, and the limiting member 6 is provided with a first buckle 81; the turnover plate 21 is provided with a second buckle 82 corresponding to the first buckle 81, and the first buckle 81 and the second buckle 82 are buckled.

[0061] It should be noted that the first buckle 81 here can be a bayonet, and the second buckle 82 can be a hook.

[0062] In some alternative embodiments, such as Figure 5 As shown, the insulating plate 2 is provided with an injection hole 7, an exhaust structure 23, and a clearance through hole for the electrode post 3 to pass through. The injection hole 7 is located between the exhaust structure 23 and the clearance through hole, and the center point of the injection hole 7 is located on the center line of the insulating plate 2 that is parallel to its length direction. Thus, the inventors found that after the adapter piece 4 and the electrode post 3 are welded, the electrode tab 5 and the electrode post 3 are misaligned in the third direction, and the injection hole 7 is easily covered by the electrode tab 5, which in turn affects the injection.

[0063] Therefore, in order to improve the injection efficiency and avoid the tab 5 obstructing the injected electrolyte, the injection hole 7 can be located as far away from the tab 5 as possible. That is, as follows... Figure 7 As shown, the injection hole 7 is located on the side of the first connecting part 51 away from the bending part 52, that is, the injection hole 7 is set off the center line on the insulating plate 2.

[0064] Specifically, in the first direction, the distance between the injection hole 7 and the edge of the insulating plate 2 near the bending portion 52 is the third distance c; the distance between the injection hole 7 and the edge of the insulating plate 2 away from the bending portion 52 is the fourth distance d; the third distance c is greater than the fourth distance d, and 10mm≤c≤55mm, 5mm≤d≤25mm.

[0065] Specifically, the value of the third distance c can be 10mm or 16mm or 20mm or 24mm or 30mm or 35mm or 40mm or 47mm or 50mm or 55mm; the value of the fourth distance d can be 5mm or 8mm or 12mm or 16mm or 19mm or 23mm or 25mm.

[0066] Furthermore, in the third direction, the distance L between the injection hole 7 and the adapter piece 4 is the fifth distance, which satisfies the following condition: 6mm ≤ L ≤ 13mm. Specifically, the value of L can be 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, or 13mm.

[0067] This allows for the use of square lithium-ion battery cells in electric vehicles, enabling the battery cell to increase the injection speed during the liquid injection process, thereby improving the liquid injection efficiency of the battery cell.

[0068] In addition, since the flip plate 21 is located between the injection hole 7 and the main body 10 after installation, it will block the electrolyte during injection. Therefore, a leakage structure 71 can be provided on the flip plate 21 at the position corresponding to the injection hole 7 to facilitate the electrolyte to enter the main body 10 during injection and further improve the injection efficiency.

[0069] For purposes of the description hereinafter, spatial

[0070] In addition, it should be noted that the use of "first", "second", etc. to describe a component should be understood in terms of that component being distinguished from another component that is also described with "first", "second", etc. terminology, unless otherwise stated, and is not meant to imply that the components so described must be in a certain order, or placed next to, or on, one another, in a specific order, and that the described components must wear a certain label. Thus the use of "first", "second", etc. terminology is only made for the purpose of distinguishing between two components from each other.

[0071] The preferred embodiments of the present application are described above in detail. The present application, however, is not limited to only the above embodiments. It will be appreciated by persons skilled in the art that changes are possible in form and details without departing from the spirit and essential characteristics of the present application. The embodiments described above are merely exemplary and are not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall within the scope of the present application.

Claims

1. A battery cell, characterized by, The utility model relates to a battery terminal structure, including: An end cover assembly includes an end cover (1), an insulating plate (2) and a pole (3), the pole (3) is arranged in the end cover (1), the insulating plate (2) is connected to the end cover (1), and the insulating plate (2) is sleeved on the pole (3); An electrode assembly includes a main body (10) and a tab (5) protruding from the main body (10); the tab (5) is located between the main body (10) and the insulating plate (2); An adapter plate (4) connects the tab (5) and the pole (3); Wherein, at least one side of the adapter plate (4) in the first direction is provided with a limiting piece (6), the limiting piece (6) is connected to the side of the insulating plate (2) away from the end cover (1); in the second direction, the distance between the surface of the main body (10) and the limiting piece (6) is the first distance a, the distance between the surface of the main body (10) and the adapter plate (4) away from the main body (10) is the second distance b, the first distance a is less than the second distance b, the second direction is the thickness direction of the end cover (1), and the first direction is the width direction of the end cover (1).

2. The battery cell of claim 1, wherein, The adapter plate (4) and the limiting piece (6) abut.

3. The battery cell of claim 1, wherein, The adapter plate (4) is provided with two, the two adapter plates (4) are opposite in polarity, and the two adapter plates (4) are spaced apart in the third direction; at least one side of the two adapter plates (4) in the first direction is provided with a limiting piece (6), and the third direction is the length direction of the end cover (1).

4. The battery cell of claim 1, wherein, The sum of the size of the limiting piece (6) and the size of the adapter plate (4) in the first direction does not exceed the size of the insulating plate (2) in the first direction; And / or, the size of the limiting piece (6) in the third direction does not exceed the size of the adapter plate (4) in the third direction; And / or, the size of the limiting piece (6) in the third direction is 20mm to 80mm; the size of the limiting piece (6) in the first direction is 5mm to 10mm, and the third direction is the length direction of the end cover (1).

5. The battery cell according to any one of claims 1 to 4, characterized in that, The tab (5) includes a first connecting part (51) and a bending part (52) connected in sequence; The end cover assembly further includes a turnover plate (21), the first connecting part (51) and the adapter plate (4) are connected, and the first connecting part (51) and the adapter plate (4) are located between the insulating plate (2) and the turnover plate (21); One end of the turnover plate (21) in the third direction is foldably connected with the insulating plate (2); the third direction is the length direction of the end cover (1); Wherein, the bending part (52) is located on one side of the turnover plate (21) in the first direction; the limiting piece (6) is arranged between the end of the turnover plate (21) away from the bending part (52) and the insulating plate (2), and the limiting piece (6) and the turnover plate (21) abut.

6. The battery cell of claim 5, wherein, The limiting piece (6) is provided with a first buckle (81); the turnover plate (21) is provided with a second buckle (82) corresponding to the first buckle (81), and the first buckle (81) and the second buckle (82) are clamped.

7. The battery cell of claim 5, wherein, One end of the turnover plate (21) away from the bending part (52) of the tab (5) is provided as a thickened part (53), the thickened part (53) abuts against the limiting piece (6), and the thickened part (53) abuts against the main body (10).

8. The battery cell of any one of claims 1 to 4, wherein, The insulating plate (2) is provided with a liquid injection hole (7), the liquid injection hole (7) is located between the exhaust structure (71) provided on the turnover plate (21) and the liquid injection mounting hole provided on the end cover (1), the liquid injection mounting hole is a through hole provided on the end cover (1) corresponding to the position of the liquid injection hole (7) and penetrating through the liquid injection hole (7); The tab (5) includes a first connecting part (51) and a bending part (52) connected in sequence, the first connecting part (51) of the tab (5) is connected with the adapter sheet (4); Wherein, the liquid injection hole (7) is located on the side of the first connecting part (51) away from the bending part (52); in the first direction, the distance between the liquid injection hole (7) and the side edge of the insulating plate (2) close to the bending part (52) is a third distance c; the distance between the liquid injection hole (7) and the side edge of the insulating plate (2) away from the bending part (52) is a fourth distance d; the third distance c is greater than the fourth distance d, and 10mm≤c≤55mm, 5mm≤d≤25mm.

9. The battery cell of claim 8, wherein, The liquid injection hole (7) is located between the exhaust structure (71) and the adapter sheet (4); in the third direction, the distance between the liquid injection hole (7) and the adapter sheet (4) is a fifth distance L, 6mm≤L≤13mm.

10. An electric device, characterized by The battery cell includes the battery cell as claimed in any one of claims 1 to 9. The battery cell includes the battery cell as claimed in any one of claims 1 to 9.

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