Battery monomer and electric equipment

Abstract

The utility model relates to a battery monomer and electric equipment. Wherein the single battery comprises a battery cell and an end cover assembly, the battery cell comprises a tab, and the tab comprises a first connecting part, a second bending part and a second connecting part which are connected in sequence; the end cover rent comprises a pole and a conductive piece, the conductive piece comprises a first conductive part, a first bending part and a second conductive part which are connected in sequence, the first connecting part is located between the first conductive part and the second conductive part, and the first connecting part of the tab is connected with the second conductive part; wherein the second conductive part is provided with an insulating part, the insulating part is provided with an abutting part, the abutting part is arranged on the side, away from the first bending part, of the second conductive part, and the abutting part abuts against the second bending part of the tab. The battery monomer can greatly reduce the occurrence of short circuit caused by the fact that the tabs are inversely inserted into the battery cells, and is favorable for reducing over-current temperature rise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer and an electric device. BACKGROUND

[0002] With the increasing competition of lithium batteries, reducing cost has become an important research and development direction, and the optimization of structure is the simplest and most direct way to reduce cost. The top cover, as the structural part with the most components of the battery, has become one of the research breakthrough directions.

[0003] At present, during the assembly of the battery, the positive and negative tabs of the battery cell are respectively welded with the corresponding conductive parts, and then the conductive parts are welded with the corresponding pole of the top cover, so as to realize the electrical connection of the tabs and the pole. After that, the work of bending the battery cell relative to the top cover is carried out, so that the top cover is placed at the end of the tab leading out of the battery cell. However, during the process of bending the battery cell relative to the top cover, i.e. the tab bending, the tab may be inserted into the inside of the battery cell, causing a short circuit. Therefore, a tab pad is generally used to guide the tab bending and maintain the tab bending state, so as to avoid the tab from being inserted into the inside of the battery cell. However, the introduced tab pad does not help the performance of the battery, and occupies a certain space. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the embodiments of the present application provide a battery monomer and an electric device to solve at least one problem in the background art.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, comprising:

[0006] The battery cell comprises a tab, and the tab comprises a first connecting part, a second bending part and a second connecting part connected in sequence.

[0007] The end cover assembly comprises a pole and a conductive part, and the conductive part comprises a first conductive part, a first bending part and a second conductive part connected in sequence. The first conductive part is connected to the pole. The first connecting part of the tab is located between the first conductive part and the second conductive part, and the first connecting part and the second connecting part of the tab are connected.

[0008] The second conductive part is provided with an insulating part, and the insulating part has an abutting part. The abutting part is arranged on the side of the second conductive part away from the first bending part, and the abutting part abuts against the second bending part of the tab.

[0009] In combination with the first aspect of the present application, in an optional implementation manner, the abutting part is a deformable structure.

[0010] In combination with the first aspect of the present application, in an optional implementation, the extension length of the abutting portion is L1, and 1 mm≤L1≤3 mm.

[0011] In combination with the first aspect of the present application, in an optional implementation, the pole column is integrally formed with the first conductive portion of the conductive member; and / or, the conductive member is an integrally formed structure; and / or, the insulating member is integrally fused with the second conductive portion of the conductive member by injection molding.

[0012] In combination with the first aspect of the present application, in an optional implementation, the insulating member further comprises a second insulating portion and a first insulating portion, the second conductive portion is connected to the first insulating portion at an end away from the first bending portion, and the abutting portion is connected to the first insulating portion at an end away from the second bending portion; the second conductive portion is connected to the second insulating portion at both sides along the width direction of the second conductive portion; both the second insulating portions extend along the length direction of the second conductive portion, and both the second insulating portions are connected to the first insulating portion.

[0013] In combination with the first aspect of the present application, in an optional implementation, the second insulating portion has a second wall and two first walls, the two first walls are oppositely arranged along the thickness direction of the second conductive portion, the two first walls are connected by the second wall, and the two first walls and the second wall form a slot, and the slot is in plug-in cooperation with the second conductive portion.

[0014] In the thickness direction of the second conductive portion, the thickness of the first wall is h1, the thickness of the abutting portion is h2, 0.1 mm≤h1≤0.2 mm, and 0.1 mm≤h2≤0.2 mm; and / or, in the width direction of the second conductive portion, the width of the first wall is L2, 2 mm

[0015] In combination with the first aspect of the present application, in an optional implementation, the conductive member further comprises a third conductive portion, the third conductive portion is located between the first connecting portion of the tab and the first conductive portion, the third conductive portion and the second conductive portion are both connected to the first bending portion, and the third conductive portion, the first connecting portion of the tab, and the second conductive portion are connected together.

[0016] In combination with the first aspect of the present application, in an optional implementation, the thickness of the third conductive portion is h, the thickness of the second conductive portion is h3, 0

[0017] In combination with the first aspect of the present application, in an optional implementation, the first bending portion is provided with a groove at at least one side along the thickness direction thereof.

[0018] In a second aspect, the embodiments of the present application provide a battery cell, which is the battery cell according to any one of the first aspect.

[0019] The battery cell provided by the embodiments of the present application has the second conductive part connected with the insulating part, and the abutting part of the insulating part can abut against the second bending part of the tab, so that the structure of the insulating part and the second conductive part replaces the tab backing plate, not only can guide the tab bending and maintain the tab bending state, thereby greatly reducing the situation that the tab is inserted into the inside of the battery cell to cause short circuit, but also the design of the second conductive part makes the pole and the tab not need to be arranged in the length direction of the cover plate, thereby greatly shortening the overcurrent path, and is beneficial to reduce the overcurrent temperature rise.

[0020] The additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are intended to provide further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their description serve to explain the present application. The drawings in the present application should not be considered as an inappropriate limitation of the present application.

[0022] Figure 1 The structural exploded view of the end cover assembly in the battery cell provided by the embodiments of the present application;

[0023] Figure 2 The three-dimensional structural view of the end cover assembly (the conductive part is in an unfolded state) in the battery cell provided by the embodiments of the present application;

[0024] Figure 3 The Figure 2 The sectional view at A-A in FIG. 5;

[0025] Figure 4 The structural view of the conductive part after bending in the battery cell provided by the embodiments of the present application;

[0026] Figure 5a The structural view of the second conductive part connected with the insulating part in the battery cell provided by the embodiments of the present application;

[0027] Figure 5b The sectional view of the second conductive part connected with the insulating part in the battery cell provided by the embodiments of the present application;

[0028] Figure 6 The three-dimensional structural view of the end cover assembly (the conductive part is in an unfolded state) in the battery cell provided by the embodiments of the present application;

[0029] Figure 7A perspective view of an insulating piece in a battery cell according to an embodiment of the present application is provided.

[0030] Figure 8 A plan view of an insulating piece in a battery cell according to an embodiment of the present application is provided.

[0031] Figure 9 A perspective view of an insulating piece in a battery cell according to another embodiment of the present application is provided.

[0032] Figure 10 A structure view of a second conductive piece and a third conductive piece in a battery cell according to an embodiment of the present application is provided.

[0033] Figure 11a A structure view of a second conductive piece and a third conductive piece in a battery cell according to an embodiment of the present application is provided.

[0034] Figure 11b A structure view of a second conductive piece and a third conductive piece in a battery cell according to an embodiment of the present application is provided.

[0035] Figure 12 A structure view of a second conductive piece and a third conductive piece in a battery cell according to an embodiment of the present application is provided. Figure 2 An enlarged view of B in FIG. 8.

[0036] Reference signs:

[0037] 10, end cover assembly; 110, pole; 111, mounting groove;

[0038] 120, cover plate; 121, first mounting hole; 122, second mounting hole;

[0039] 130, conductive piece; 131, first conductive part; 132, first bending part; 1321, groove; 133, second conductive part; 134, third conductive part;

[0040] 140, lower insulating plate; 141, third mounting hole; 142, exhaust port;

[0041] 20, insulating piece; 210, abutting part; 220, second insulating part; 221, first wall; 222, second wall; 223, insertion slot; 230, first insulating part;

[0042] 30, tab; 310, first connecting part; 320, second bending part; 330, second connecting part;

[0043] 40, battery cell. DETAILED DESCRIPTION

[0044] In order to make the technical scheme and beneficial effects of the utility model more obvious and easy to understand, the following will be described in detail by means of enumerating specific embodiments. In the drawings, the parts are not necessarily drawn to scale, and some local features can be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used in this document have the same meaning as the technical and scientific terms in the technical field to which this application belongs.

[0045] In the description of the utility model, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of the simplified description of the utility model, and does not indicate that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, that is, it cannot be understood as a limitation on the utility model.

[0046] In the utility model, the terms "first" and "second" are only used for the purpose of clear description, and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc. The meaning of "several" is at least one, such as one, two, three, etc. Except for the specific limitation.

[0047] In the utility model, unless otherwise defined, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be understood broadly. For example, "connection" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise explicitly limited, the first feature is "on", "over", "above" and "upper" of the second feature, "under", "below" and "lower" of the second feature can be the first feature and the second feature directly contact, or the first feature and the second feature indirectly contact through intermediate medium. Moreover, the first feature is "over", "above" and "upper" of the second feature can be the first feature directly above or obliquely above the second feature, or just indicate that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature is "under", "below" and "lower" of the second feature can be the first feature directly below or obliquely below the second feature, or just indicate that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0049] Embodiment one

[0050] Please refer to Figures 1 to 3 , Figure 1 The end cover assembly 10 of the battery monomer is shown in the exploded view of the battery monomer. Figure 2 It is the assembly drawing of the end cover assembly 10, wherein the conductive part 130 is shown as the unfolded schematic diagram before being bent. Figure 3 The cross-sectional structure of the end cover assembly 10 is shown in the cross-sectional structure of the end cover assembly 10.

[0051] The end cover assembly 10 comprises a pole 110, a cover plate 120, a lower insulating plate 140 and a conductive part 130, the cover plate 120 is an aluminum plate, the cover plate 120 is provided with a first mounting hole 121 and a second mounting hole 122, the first mounting hole 121 is provided for the pole 110, the second mounting hole 122 is provided for the explosion-proof valve, the number of the first mounting hole 121 is two; The cover plate 120 can also be provided with a liquid injection hole (not shown in the figure), and the liquid injection hole can be funnel-shaped, conical prism-shaped. The lower insulating plate 140 is provided with a third mounting hole 141 and an exhaust port 142, the cover plate 120 and the lower insulating plate 140 are stacked, and the positions of the first mounting hole 121 and the third mounting hole 141 correspond, and the positions of the second mounting hole 122 and the exhaust port 142 correspond. The pole 110 is provided with a mounting groove 111, the pole 110 penetrates the first mounting hole 121 and the third mounting hole 141, and one end of the pole 110 protrudes from the cover plate 120, and the other end of the pole 110 protrudes from the lower insulating plate 140, wherein the shape of the first mounting hole 121 can be set according to the shape of the pole 110, including but not limited to circular, elliptical, square.

[0052] Please refer to Figure 4 , Figure 5a and Figure 5b , Figure 4 The position relationship between the end cover assembly 10 and the battery core 40 is shown in the position relationship between the end cover assembly 10 and the battery core 40. Figure 5a and Figure 5b The position relationship between the end cover assembly 10, the insulating part 20 and the battery core 40 is shown in the position relationship between the end cover assembly 10, the insulating part 20 and the battery core 40.

[0053] The tab 30 includes a first connecting portion 310, a second bending portion 320 and a second connecting portion 330 connected in sequence, and the second connecting portion 330 of the tab 30 is led out from the main body. The conductive member 130 includes a first conductive portion 131, a first bending portion 132 and a second conductive portion 133 connected in sequence, the first conductive portion 131 is connected to the pole 110, the first connecting portion 310 of the tab 30 is located between the first conductive portion 131 and the second conductive portion 133, and the first connecting portion 310 and the second conductive portion 133 of the tab 30 are connected.

[0054] The second conductive portion 133 is connected with the insulating member 20, and the insulating member 20 has an abutting portion 210, which is arranged on the side of the second conductive portion 133 away from the first bending portion 132, and the abutting portion 210 abuts against the second bending portion 320 of the tab 30.

[0055] The above battery monomer, since the end of the second conductive portion 133 away from the first bending portion 132 is connected with the insulating member 20, and the first connecting portion 310 of the tab 30 is located between the first conductive portion 131 and the second conductive portion 133, when the tab 30 is bent, the tab 30 will be bent around the insulating member 20, which can guide the tab 30 to bend, and further reduce the risk of the tab 30 being inserted into the inside of the battery cell 40 when the tab 30 is bent. In addition, since the abutting portion 210 of the insulating member 20 and the second bending portion 320 of the tab 30 abut against each other, the risk of the tab 30 being inserted into the inside of the battery cell 40 after the tab is bent is reduced. In addition, since the second conductive portion 133 and the first connecting portion 310 of the tab 30 are welded, the first conductive portion 131 is connected to the pole 110, and the second conductive portion 133 and the first conductive portion 131 are arranged in layers, therefore, the pole 110 and the tab 30 do not need to be arranged in a staggered manner along the length direction of the cover plate 120, the center distance of the two tabs 30 on the battery cell 40 and the center distance of the two poles 110 on the cover plate 120 can be consistent, and further, the overcurrent path is greatly shortened, which is conducive to reducing the overcurrent temperature rise.

[0056] In an optional embodiment, the abutting portion 210 is a deformable structure. The material of the abutting portion 210 includes but is not limited to plastic material and rubber material. The deformable structure can absorb the error existing in the processing of the tab 30, that is, the error existing in the processing of the tab 30 can be absorbed by bending the abutting portion 210, thereby ensuring that the condition of the tab 30 being inserted into the inside of the battery cell 40 to cause short circuit does not occur, while ensuring that the second bending portion 320 of the tab 30 is not damaged.

[0057] Further, the extension length of the abutting portion 210 is L1, that is Figure 5aThe length L1 of the abutting portion 210 is greater than or equal to 1 mm and less than or equal to 3 mm, as indicated by the label L1 in FIG. 1. If the length L1 is too short, the deformation of the abutting portion 210 is not conducive, and if the length L1 is too long, the bending of the tab 30 is not conducive. Therefore, when 1 mm≤L1≤3 mm, the tab 30 is not only conducive to bending and maintaining the bent state of the tab 30, but also conducive to reducing damage to the tab 30. Specifically, the length L1 can be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.1 mm, 2.5 mm, 2.8 mm, or 3 mm.

[0058] In an optional embodiment, the pole 110 is integrally formed with the first conductive portion 131 of the conductive member 130. The welding process of the pole 110 and the conductive member 130 can be cancelled, thereby avoiding problems caused by welding slag and improving the processing efficiency of the battery cell.

[0059] In an optional embodiment, the conductive member 130 is an integrally formed structure, that is, the thicknesses of the first conductive portion 131, the first bending portion 132, and the second conductive portion 133 are consistent. For example, the first conductive portion 131, the first bending portion 132, and the second conductive portion 133 are bent by a bending process to effectively ensure the structural stability of the conductive member 130.

[0060] Specifically, while the pole 110 is integrally formed with the first conductive portion 131 of the conductive member 130, the conductive member 130 can also be designed as an integrally formed structure.

[0061] In an optional embodiment, the insulating member 20 is integrally fused with the second conductive portion 133 of the conductive member 130 by injection molding, which can improve the connection stability of the insulating member 20 and the second conductive portion 133.

[0062] Specifically, while the insulating member 20 is integrally fused with the second conductive portion 133 of the conductive member 130 by injection molding, the first conductive portion 131 can be designed as an integrally formed structure; or while the insulating member 20 is integrally fused with the second conductive portion 133 of the conductive member 130 by injection molding, the first conductive portion 131 is an integrally formed structure, and the pole 110 is integrally formed with the first conductive portion 131 of the conductive member 130.

[0063] In an optional embodiment, in order to stably connect the insulating member 20 and the second conductive portion 133, as shown in FIGS. Figure 5a and Figure 6 The insulating member 20 further includes a first insulating portion 230, an end of the second conductive portion 133 away from the first bending portion 132 is connected to the first insulating portion 230, and an end of the abutting portion 210 away from the second bending portion 320 is connected to the first insulating portion 230.

[0064] It can be understood that the first insulating part 230 connects the second conductive part 133 and the abutting part 210.

[0065] In this embodiment, since the abutting part 210 is a deformable structure made of plastic material, in order to ensure that the abutting part 210 can be deformed, the abutting part 210 will be made thinner. At this time, if the abutting part 210 and the second conductive part 133 are directly connected, the contact area of the connection is too small, and the connection is not stable. Therefore, the first insulating part 230 is designed to connect the second conductive part 133 and the abutting part 210. In this way, not only can the first insulating part 230 and the abutting part 210 be integrally formed by injection molding, which ensures the stable connection of the first insulating part 230 and the abutting part 210, but also the thickness of the first insulating part 230 can be made thicker compared to the thickness of the abutting part 210. In this way, the contact area of the connection between the first insulating part 230 and the second conductive part 133 is increased, thereby improving the stability of the connection.

[0066] Further, in order to make the connection between the insulating part 20 and the second conductive part 133 more stable, as shown in Figure 5a and Figure 6 The insulating part 20 further comprises a second insulating part 220, and the second conductive part 133 is connected with the second insulating part 220 on both sides along the width direction. Both second insulating parts 220 extend along the length direction of the second conductive part 133, and both second insulating parts 220 are connected with the first insulating part 230.

[0067] It can be understood that the two ends of the first insulating part 230 are respectively connected with the second insulating part 220, and the first insulating part 230 and the two second insulating parts 220 form a U-shaped structure. The U-shaped structure is not only connected with the two sides along the width direction of the second conductive part 133, but also connected with one side along the length direction of the second conductive part 133.

[0068] In this embodiment, on the basis of the first insulating part 230 connecting the abutting part 210 and the second conductive part 133, the first insulating part 230 is connected with the second conductive part 133 through the second insulating part 220, further increasing the contact area with the second conductive part 133, thereby improving the stability of the connection.

[0069] Specifically, referring to Figure 7 It can be understood that the second insulating part 220 has a second wall 222 and two first walls 221. The two first walls 221 are oppositely arranged along the thickness direction of the second conductive part 133, and the two first walls 221 are connected through the second wall 222. The two first walls 221 and the second wall 222 form a slot 223, and the slot 223 and the second conductive part 133 are inserted and matched.

[0070] It can be understood that the slot 223 and the side edge of the second conductive part 133 are inserted and matched, and thus designed, not only the end faces of the second wall 222 and the second conductive part 133 in the width direction are in contact, but also the two first walls 221 are respectively in contact with the two side faces of the second conductive part 133 in the thickness direction, and further, the contact area of the connection between the second insulating part 220 and the second conductive part 133 is greatly increased, so that the connection is more stable when the insulating part 20 and the second conductive part 133 are fused by injection molding.

[0071] It should be noted that in an optional embodiment, the slot 223 extends to the first insulating part 230, and the first insulating part 230 is inserted and matched with the second conductive part 133, that is, the structure of the first insulating part 230 and the second insulating part 220 can be the same, that is, the first insulating part 230 can also be inserted and matched with one side edge of the second conductive part 133 in the length direction, so that the connection firmness of the insulating part 20 and the second conductive part 133 can be improved.

[0072] Of course, considering that the second insulating part 220 has been designed to connect the first insulating part 230 and the second conductive part 133, in another optional embodiment, as shown in Figure 9 , the side of the first insulating part 230 away from the abutting part 210 is in abutment with the end of the second conductive part 133 close to the second bending part 320, that is, the first insulating part 230 is in contact with one end face of the second conductive part 133 in the length direction.

[0073] Further, in the thickness direction of the second conductive part 133, the thickness of the first wall 221, that is, Figure 7 h1 shown in the figure, the thickness of h1 ranges from greater than or equal to 0.1 mm to less than or equal to 0.2 mm; and the thickness of the abutting part 210, that is, Figure 7 h2 shown in the figure, the thickness of h2 ranges from greater than or equal to 0.1 mm to less than or equal to 0.2 mm.

[0074] It can be understood that while ensuring to increase the contact area of the connection between the second conductive part 133 and the second insulating part 220, the first wall 221 of the second insulating part 220 is prevented from being too thick to waste material, and thus 0.1 mm≤h1≤0.2 mm is designed, and specifically, the value of h1 can be 0.1 mm or 0.12 mm or 0.16 mm or 0.18 mm or 0.2 mm.

[0075] It is understandable that, while ensuring that the abutment part 210 is deformable, the structural strength of the abutment part 210 should not be too poor, that is, to prevent the abutment part 210 from easily breaking when deformed. Therefore, the design is 0.1mm≤h2≤0.2mm. Specifically, the value of h2 can be 0.1mm, 0.13mm, 0.15mm, 0.17mm, 0.18mm, or 0.2mm. The thickness h2 of the abutment part 210 can be equal to the thickness h1 of the first wall 221. Of course, the thickness h2 of the abutment part 210 can also be different from the thickness h1 of the first wall 221, depending on the design.

[0076] In the width direction of the second conductive part 133, that is Figure 8 The width of the first wall 221 in the direction of arrow s1 shown in the figure, that is... Figure 8 The dimension of L2 shown is greater than 2 mm and less than 5 mm. The width range of the first wall 221 not only ensures the firm connection between the insulating member 20 and the second conductive part 133, greatly reducing the risk of the insulating member 20 detaching from the second conductive part 133, but also meets the minimum proportion requirement, avoiding waste of materials. Specifically, the value of L2 can be 2 mm, 2.3 mm, 2.7 mm, 3.5 mm, 3.9 mm, 4.3 mm, 4.6 mm, or 5 mm.

[0077] It should be noted that when the size range of L2 is greater than 2mm and less than 5mm, the thickness range of h1 is greater than or equal to 0.1mm and less than or equal to 0.2mm, and the thickness range of h2 is greater than or equal to 0.1mm and less than or equal to 0.2mm; of course, it is also possible that only the size range of L2 is greater than 2mm and less than 5mm; or, only the thickness range of h1 is greater than or equal to 0.1mm and less than or equal to 0.2mm, and the thickness range of h2 is greater than or equal to 0.1mm and less than or equal to 0.2mm.

[0078] In one embodiment, see Figure 12 As shown, a groove 1321 is provided on at least one side of the first bending portion 132 along its thickness direction. The groove 1321 reduces the stress required during bending. Specifically, the width of the groove 1321 is greater than or equal to h5*2+1mm, where h5 is the thickness of the first conductive portion 131, i.e. Figure 4 The depth of the groove 1321 is greater than or equal to h5*1 / 2 and less than h5. The width and depth of the groove 1321 are within the range that ensures that the conductive part 130 forms the first conductive part 131, the first bent part 132 and the second conductive part 133 through the bending process.

[0079] Example 2

[0080] The basic structure of the battery cell of this embodiment is the same as that of Embodiment One, except that Figure 10 , Figure 11a , Figure 11b and Figure 12 The conductive member 130 further comprises a third conductive part 134, which is located between the first connecting part 310 of the tab 30 and the first conductive part 131, and the third conductive part 134 and the second conductive part 133 are both connected with the first bending part 132, and the third conductive part 134, the first connecting part 310 of the tab 30 and the second conductive part 133 are connected together.

[0081] It can be understood that the third conductive part 134 is located between the first conductive part 131 and the second conductive part 133, and the first connecting part 310 of the tab 30 is located between the third conductive part 134 and the second conductive part 133.

[0082] In this embodiment, the bifurcated structure formed by the second conductive part 133 and the third conductive part 134 is designed, so that the first connecting part 310 of the tab 30 is placed between the second conductive part 133 and the third conductive part 134, and the first connecting part 310 of the tab 30, the second conductive part 133 and the third conductive part 134 are connected together, which facilitates ultrasonic welding and greatly reduces the cracking phenomenon caused by direct welding of the foil.

[0083] It should be noted that the third conductive part 134 and the first bending part 132 are integrally formed, that is, the distance between the side of the third conductive part 134 facing the first conductive part 131 and the side of the second conductive part 133 away from the third conductive part 134 is equal to the thickness of the first conductive part 131.

[0084] Further, in order to ensure the firmness of the ultrasonic welding of the first connecting part 310 of the tab 30, the second conductive part 133 and the third conductive part 134 together, the thickness of the third conductive part 134, that is, h4 shown in Figure 10 , is greater than 0 mm and less than 0.2 mm. Specifically, the value of h4 can be 0.05 mm or 0.1 mm or 0.15 mm or 0.2 mm.

[0085] Further, in order to cooperate with the design of the third conductive part 134, and also to ensure the firmness of the ultrasonic welding of the first connecting part 310 of the tab 30, the second conductive part 133 and the third conductive part 134 together, the thickness of the second conductive part 133, that is, h3 shown in Figure 10 , is greater than or equal to 0.6 mm and less than or equal to 1.2 mm. Specifically, the value of h3 can be 0.6 mm or 0.7 mm or 0.8 mm or 0.9 mm or 1.0 mm or 1.1 mm or 1.2 mm.

[0086] Example Three

[0087] The embodiments of the present application also provide a battery cell, which is connected with the insulating piece 20 at the second conductive part 133, and the abutting part 210 of the insulating piece 20 can abut against the second bending part 320 of the tab 30. The battery cell not only greatly reduces the situation that the tab 30 is inserted into the inside of the battery cell 40 to cause short circuit, but also improves the safety and stability of the battery cell, and greatly shortens the overcurrent path, which is beneficial to reduce the overcurrent temperature rise.

[0088] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations of the claims. Various modifications and changes can also be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, any combination of the technical features of the above embodiments can also be made to form additional embodiments of the present application which can not be explicitly described. Therefore, the above embodiments only express several implementation manners of the present application, and do not limit the protection scope of the patent of the present application.

Claims

1. A battery cell, characterized by, The application relates to a battery cell (40) and an end cover assembly (10) thereof. The battery cell (40) comprises a tab (30), which comprises a first connecting part (310), a second bending part (320) and a second connecting part (330) connected in sequence. The end cover assembly (10) comprises a pole (110) and a conductive part (130), wherein the conductive part (130) comprises a first conductive part (131), a first bending part (132) and a second conductive part (133) connected in sequence, and the first conductive part (131) is connected to the pole (110); the first connecting part (310) of the tab (30) is located between the first conductive part (131) and the second conductive part (133), and the first connecting part (310) and the second conductive part (133) of the tab (30) are connected. The second conductive part (133) is provided with an insulating part (20), and the insulating part (20) has an abutting part (210) arranged on the side of the second conductive part (133) away from the first bending part (132), and the abutting part (210) and the second bending part (320) of the tab (30) abut.

2. The battery cell of claim 1, wherein, The abutting part (210) is a deformable structure.

3. The battery cell of claim 1, wherein, The extension length of the abutting part (210) is L1, and 1mm<=L1<=3mm.

4. The battery cell of claim 1, wherein, The pole (110) and the first conductive part (131) of the conductive part (130) are integrally formed; and / or the conductive part (130) is an integrally formed structure; and / or the insulating part (20) is integrally fused with the second conductive part (133) of the conductive part (130) through injection molding.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The insulating part (20) further comprises a second insulating part (220) and a first insulating part (230), one end of the second conductive part (133) away from the first bending part (132) is connected to the first insulating part (230), and one end of the abutting part (210) away from the second bending part (320) is connected to the first insulating part (230); the second conductive part (133) is connected to the second insulating part (220) on both sides in the width direction of the second conductive part (133); the second insulating part (220) extends along the length direction of the second conductive part (133), and the second insulating part (220) is connected to the first insulating part (230).

6. The battery cell of claim 5, wherein, The second insulating part (220) has a second wall (222) and two first walls (221), the two first walls (221) are oppositely arranged in the thickness direction of the second conductive part (133), the two first walls (221) are connected through the second wall (222), and the two first walls (221) and the second wall (222) form a slot (223); the slot (223) and the second conductive part (133) are insertedly matched. In the thickness direction of the second conductive part (133), the thickness of the first wall (221) is h1, the thickness of the abutting part (210) is h2, 0.1mm≤h1≤0.2mm, 0.1mm≤h2≤0.2mm; and / or in the width direction of the second conductive part (133), the width of the first wall (221) is L2, 2mm<L2<5mm.

7. The battery cell of claim 1, wherein, The conductive part (130) further comprises a third conductive part (134), which is located between the first connecting part (310) of the tab (30) and the first conductive part (131), the third conductive part (134) and the second conductive part (133) are both connected with the first bending part (132), and the third conductive part (134), the first connecting part (310) of the tab (30) and the second conductive part (133) are connected together.

8. The battery cell of claim 7, wherein, The thickness of the third conductive part (134) is h4, the thickness of the second conductive part (133) is h3, 0<h4<0.2mm, 0.6mm≤h3≤1.2mm.

9. The battery cell of claim 1, wherein, The first bending part (132) is provided with a groove (1321) on at least one side along its thickness direction.

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

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