Tab leveling mechanism and tab leveling device

Abstract

The utility model discloses a tab flattening mechanism and a tab flattening device, and the tab flattening mechanism comprises a sleeve which is provided with an open end and a closed end; the first connecting piece is at least partially arranged in the sleeve; the first flattening piece is in sliding fit with the inner wall of the sleeve, a first elastic piece is arranged between the first flattening piece and the first connecting piece, and a plurality of first electrode lug folding parts are arranged in the circumferential direction of the first flattening piece; the second leveling piece is in sliding fit with the inner wall of the first leveling piece, a second elastic piece is arranged between the second leveling piece and the first connecting piece, and a plurality of second electrode lug folding parts are arranged in the circumferential direction of the second leveling piece; the tab folding included angle between the first tab folding part and the axis of the first leveling piece is not equal to the tab folding included angle between the second tab folding part and the axis of the second leveling piece; and in a non-working state, the first folded tab part and the second folded tab part with a smaller included angle are close to the opening end. According to the invention, the leveling concentricity of the battery cell tab can be ensured, and the yield of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery production equipment, and in particular to a tab flattening mechanism and a tab flattening device. Background Art

[0002] like Figure 1 As shown, the battery cell 100 has multiple pole ears 101 at both ends. Before welding the busbar, the pole ears 101 need to be pre-pressed. By bending the pole ears 101 multiple times, the multiple pole ears 101 of the battery cell 100 are finally flattened to form a Figure 2 Shape shown.

[0003] The tab flattening mechanism in the prior art is provided with a plurality of flattening grooves of different shapes, each of which has a different shape and corresponds to a work station. Therefore, the battery cell clamping mechanism needs to move the battery cell to different work stations so as to bend the tab multiple times, which will cause concentricity errors of the battery cell at multiple work stations, affect the flattening accuracy of the battery cell tab, and even cause the product to be scrapped, thereby reducing the battery cell yield rate.

[0004] Therefore, it is necessary to improve the existing technology and provide a new tab flattening mechanism and tab flattening device. Utility Model Content

[0005] One purpose of the present application is to provide a new technical solution for a tab flattening mechanism and a tab flattening device.

[0006] To achieve the above-mentioned purpose, according to the first aspect of the present application, a tab flattening mechanism is provided, comprising:

[0007] a sleeve having an open end and a closed end;

[0008] a first connecting member, the first connecting member being at least partially disposed inside the sleeve;

[0009] A first flattening member, wherein the first flattening member is slidably matched with the inner wall of the sleeve, a first elastic member is arranged between the first flattening member and the first connecting member, and a plurality of first folding ear portions are arranged circumferentially on the first flattening member;

[0010] A second flattening member, wherein the second flattening member is slidably matched with the inner wall of the first flattening member, a second elastic member is arranged between the second flattening member and the first connecting member, and a plurality of second folding ear portions are arranged in the circumferential direction of the second flattening member;

[0011] The folding ear angle between the first folding ear portion and the axis of the first flattening member is not equal to the folding ear angle between the second folding ear portion and the axis of the second flattening member;

[0012] In the non-working state, the one with the smaller folding ear angle between the first folding ear and the second folding ear is closer to the opening end; in the working state, the first connecting member can move toward the first flattening member and the second flattening member, and the first elastic member and the second elastic member are compressed, so that the first folding ear and the second folding ear can bend the ear of the battery cell successively.

[0013] Optionally, a first limiting portion is provided on the inner wall of the sleeve, and one end of the first flattening member away from the first elastic member can abut against the first limiting portion.

[0014] Optionally, a second limiting portion is provided on the inner wall of the sleeve, and one end of the second flattening member away from the second elastic member can abut against the second limiting portion.

[0015] Optionally, a third limiting portion is provided on the inner wall of the sleeve, and a third elastic member is provided between an end of the second flattening member away from the second elastic member and the third limiting portion.

[0016] Optionally, the tab flattening mechanism further comprises a third flattening member, the third flattening member is slidably matched with the inner wall of the second flattening member, a fourth elastic member is arranged between the third flattening member and the first connecting member, and the third flattening member is circumferentially provided with a plurality of third folded tab portions;

[0017] The folding ear angle between the first folding ear and the axis of the first flattening member is α, the folding ear angle between the second folding ear and the axis of the second flattening member is β, and the folding ear angle between the third folding ear and the axis of the third flattening member is γ, α<β<γ.

[0018] Optionally, in a non-working state, the distance between the first folding ear and the open end is d1, the distance between the second folding ear and the open end (2011) is d2, and the distance between the third folding ear and the open end is d3, d1<d2<d3; in a working state, the first connecting member can move toward the first flattening member, the second flattening member and the third flattening member, and the first elastic member, the second elastic member and the fourth elastic member are compressed, so that the first folding ear, the second folding ear and the third folding ear can bend the ear of the battery cell in turn.

[0019] Optionally, a fourth limiting portion is provided on the inner wall of the sleeve, and a fifth elastic member is provided between an end of the third flattening member away from the fourth elastic member and the fourth limiting portion.

[0020] Optionally, a second pole folding ear portion and a third pole folding ear portion are arranged between two adjacent first pole folding ear portions.

[0021] According to a second aspect of the present application, a tab flattening device is provided, comprising:

[0022] At least two tab flattening mechanisms as described in any one of the above items, the opening ends of the two tab flattening mechanisms are arranged opposite to each other;

[0023] A battery cell clamping mechanism, wherein the battery cell clamping mechanism is capable of clamping the battery cell so that the tabs at both ends of the battery cell are located between the two open ends;

[0024] At least two first driving members, each of which is connected to a first connecting member of the tab flattening mechanism, and the first driving member can drive the first connecting members of the two tab flattening mechanisms to approach each other.

[0025] Optionally, the tab flattening device further comprises a conveying mechanism, and the conveying mechanism is used to convey the battery cell to the flattening station.

[0026] Optionally, the battery cell clamping mechanism comprises a second driving member and a cylinder clamp, and the second driving member can drive the cylinder clamp to move so as to clamp the battery cell transported by the transport mechanism.

[0027] The tab flattening mechanism in the embodiment of the present application utilizes a first connecting member to push a plurality of tab flattening members that are nested in each other to bend the tab multiple times and finally flatten it, and the battery cell only needs to be kept in one station, and the folded tab portions of each tab flattening member are bent successively in the same sleeve under the action of a plurality of elastic members, and the battery cell does not need to change the station, so it will not cause concentricity error, and the tab flattening accuracy of the battery cell is high, which improves the yield rate of the battery cell and reduces the space occupied and hardware cost in the tab flattening process. The tab flattening device in the embodiment of the present application only needs one battery cell clamping mechanism to clamp the battery cell, and then uses the tab flattening mechanism to flatten it, and there is no need to set different battery cell clamping mechanisms for different flattening stations, and the structure is simple, the cost is low, and the flattening efficiency is high.

[0028] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0030] Figure 1 This is the main view of the battery cell before flattening.

[0031] Figure 2 This is the main view of the battery cell after being flattened.

[0032] Figure 3 It is a three-dimensional diagram of the tab flattening mechanism of an embodiment of the present application.

[0033] Figure 4 It is a three-dimensional diagram of the first flat piece of the embodiment of the present application.

[0034] Figure 5 It is a three-dimensional diagram of the second flat piece of the embodiment of the present application.

[0035] Figure 6 It is a three-dimensional diagram of the third flat piece of the embodiment of the present application.

[0036] Figure 7 yes Figure 3 A three-dimensional diagram of the tab flattening mechanism without the sleeve.

[0037] Figure 8 It is a front view of the tab flattening mechanism of an embodiment of the present application.

[0038] Fig. 9 is along Figure 8 Cross-sectional view along line AA.

[0039] Fig.10 It is a schematic diagram of the positional relationship between the first folded pole ear, the second folded pole ear, the third folded pole ear and the opening end of an embodiment of the present application.

[0040] Fig.11 It is a diagram showing the working principle of the tab flattening device according to an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 100, battery cell; 101, pole ear; 200, pole ear flattening mechanism; 201, sleeve; 2011, open end; 2012, closed end; 2013, first limiting portion; 2014, second limiting portion; 2015, third limiting portion; 2016, fourth limiting portion; 202, first connecting member; 203, first flattening member; 2031, first folding pole ear; 204, first elastic member; 205 , second flattening member; 2051, second folding ear; 206, second elastic member; 207, third elastic member; 208, third flattening member; 2081, third folding ear; 209, fourth elastic member; 210, fifth elastic member; 211, second connecting member; 300, battery cell clamping mechanism; 301, second driving member; 302, cylinder clamp; 400, first driving member; 500, conveying mechanism. DETAILED DESCRIPTION

[0043] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0046] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] In the following description, "connection" includes both a direct connection between the two and an indirect connection between the two via, for example, an adapter board, middleware, etc.

[0049] In the following description, "battery cell" and "tab" are only used to illustrate the working principle of the tab flattening mechanism and the tab flattening device, and should not be regarded as part of the tab flattening mechanism and the tab flattening device.

[0050] In the following description, each driving component can be driven by a variety of power sources such as a cylinder, a motor, etc.

[0051] refer to Figures 3 to 10 This embodiment provides a tab flattening mechanism 200 , including: a sleeve 201 , a first connecting member 202 , a first flattening member 203 and a second flattening member 205 .

[0052] The sleeve 201 has an open end 2011 and a closed end 2012. At least part of the first connecting member 202 is disposed inside the sleeve 201. The first flattening member 203 is slidably matched with the inner wall of the sleeve 201, a first elastic member 204 is disposed between the first flattening member 203 and the first connecting member 202, and a plurality of first folding pole ears 2031 are circumferentially disposed on the first flattening member 203. The second flattening member 205 is slidably matched with the inner wall of the first flattening member 203, a second elastic member 206 is disposed between the second flattening member 205 and the first connecting member 202, and a plurality of second folding pole ears 2051 are circumferentially disposed on the second flattening member 205.

[0053] The folding ear angle between the first folding ear portion 2031 and the axis of the first flattening member 203 is not equal to the folding ear angle between the second folding ear portion 2051 and the axis of the second flattening member 205;

[0054] In the non-working state, the one with the smaller folding ear angle between the first folding ear 2031 and the second folding ear 2051 is closer to the opening end 2011. In other words, the one with the smaller folding ear angle between the first folding ear 2031 and the second folding ear 2051 is closer to the opening end 2011. In the working state, the first connecting member 202 can move toward the first flattening member 203 and the second flattening member 205, and the first elastic member 204 and the second elastic member 206 are compressed, so that the first folding ear 2031 and the second folding ear 2051 can bend the pole ear 101 of the battery cell 100 successively.

[0055] More specifically, if Figure 3 and Fig. 9 As shown, the open end 2011 of the sleeve 201 allows multiple tabs 101 of the battery cell 100 to enter the interior of the sleeve 201, and the closed end 2012 of the sleeve 201 can be blocked by an end cover or by a bottom wall of the sleeve 201. In this article, the closed end 2012 does not necessarily completely block the sleeve 201, and a hole can also be opened on the closed end 2012 to allow gas to flow.

[0056] like Fig. 9 As shown, a portion of the first connecting member 202 is disposed inside the sleeve 201, and a portion passes through the closed end 2012 to reach the outside of the sleeve 201. In one embodiment, the first connecting member 202 is slidably matched with the inner wall of the sleeve 201, and the first connecting member 202 can also be regarded as a piston rod of the sleeve 201. The portion of the first connecting member 202 that passes through the closed end 2012 to reach the outside of the sleeve 201 is used to connect with the first driving member 400 described below. In another embodiment, the first connecting member 202 is fixedly connected to the sleeve 201 by means of interference fit, threaded connection, etc. In this case, the portion of the first connecting member 202 disposed inside the sleeve 201 can also serve as the closed end 2012, and a portion of the first connecting member 202 extends to the outside of the sleeve 201. In this case, it is still regarded as a portion of the first connecting member 202 that passes through the closed end 2012 to reach the outside of the sleeve 201. At the same time, the part of the first connecting member 202 located inside the sleeve 201 and the part located outside the sleeve 201 can be a whole, or can be two independent parts connected together. For example, the part located inside the sleeve 201 can be a bottom wall of the sleeve 201, and the part located outside the sleeve 201 itself can be a connecting member for connecting to the first driving member 400 described below.

[0057] like Figure 4 As shown, the first flattening member 203 is circumferentially provided with a plurality of first folding pole ears 2031 , and the first folding pole ears 2031 are used to perform a bending on the pole ears 101 of the battery cell 100 .

[0058] like Figure 5 As shown, the second flattening member 205 is circumferentially provided with a plurality of second folding pole ears 2051 , and the second folding pole ears 2051 are used to perform a bending on the pole ears 101 of the battery cell 100 .

[0059] like Figure 7 and Fig. 9 As shown, the first flattening member 203 is located inside the sleeve 201 and is slidably matched with the inner wall of the sleeve 201, and the second flattening member 205 is located inside the sleeve 201 and is slidably matched with the inner wall of the first flattening member 203, that is, the sleeve 201, the first flattening member 203 and the second flattening member 205 are in a coaxial nested slidable relationship. A first elastic member 204 is provided between the first flattening member 203 and the first connecting member 202, and a second elastic member 206 is provided between the second flattening member 205 and the first connecting member 202, so that when the first connecting member 202 moves toward the first flattening member 203 and the second flattening member 205, the first elastic member 204 and the second elastic member 206 can be compressed.

[0060] like Fig.10 As shown, since the axes of the first flattening member 203 and the second flattening member 205 are basically coaxial after assembly, the same axis L is used to represent them. The folding ear angle α between the first folding ear portion 2031 and the axis L is not equal to the folding ear angle β between the second folding ear portion 2051 and the axis L. The angles α and β are different, and the angles at which the pole ear 101 is bent are also different. In the non-working state, the first folding ear portion 2031 and the second folding ear portion 2051 with a smaller folding ear angle is closer to the open end 2011. In this embodiment, α<β, so the distance d1 between the first folding ear portion 2031 and the open end 2011 is smaller than the distance d2 between the second folding ear portion 2051 and the open end 2011. Wherein, d1 refers to the distance between the point closest to the opening end 2011 in the first folded pole ear 2031 and the opening end 2011, and d2 refers to the distance between the point closest to the opening end 2011 in the second folded pole ear 2051 and the opening end 2011. In other embodiments of the present application, α>β can also be made, and accordingly, the distance d1 between the first folded pole ear 2031 and the opening end 2011 is greater than the distance d2 between the second folded pole ear 2051 and the opening end 2011. In other words, the smaller the folded pole ear angle is, the closer the folded pole ear is to the opening end 2011.

[0061] like Fig. 9 and Fig.11As shown, still taking α<β as an example, in the working state, the battery cell 100 is clamped and fixed, and the first driving member 400 drives the first connecting member 202 to approach the battery cell 100, so the first connecting member 202 pushes the first flattening member 203 and the second flattening member 205 to move toward the battery cell 100 through the first elastic member 204 and the second elastic member 206. Subsequently, the first folding ear portion 2031 of the first flattening member 203 abuts against the pole ear 101, and the first connecting member 202 continues to approach the battery cell 100, the first elastic member 204 is compressed, and the first connecting member 202 moves toward the first flattening member 203, exerting pressure on the first flattening member 203, and the first folding ear portion 2031 bends the pole ear 101 once. As the first connector 202 continues to approach the battery cell 100, the second folded pole ear 2051 contacts the pole ear 101, the second elastic member 206 is compressed, the first connector 202 moves toward the second flattening member 205, and pressure is applied to the second flattening member 205, so that the second folded pole ear 2051 performs a second bend on the pole ear 101 of the battery cell 100. On the contrary, if α>β, the second folded pole ear 2051 first bends the pole ear 101 of the battery cell 100, and then the first folded pole ear 2031 performs a second bend on the pole ear 101 of the battery cell 100. Therefore, in this article, the first folding pole ear portion 2031 and the second folding pole ear portion 2051 can bend the pole ear 101 of the battery cell 100 in sequence, which means that there is a sequence in which the two fold the pole ear 101. More specifically, the folding pole ear portion with a smaller folding pole ear angle first bends the pole ear 101 of the battery cell 100, and the folding pole ear portion with a larger folding pole ear angle bends the pole ear 101 of the battery cell 100 later. It is not necessarily that the first folding pole ear portion 2031 bends the pole ear 101 first, and the second folding pole ear portion 2051 bends the pole ear 101 later. In the case where there are only two folding pole ears, β can be 90°.

[0062] In an embodiment in which the first connecting member 202 is fixedly connected to the sleeve 201, the sleeve 201 will gradually approach the battery cell 100 as the first connecting member 202 moves, and the depth of the pole ear 101 entering the interior of the sleeve 201 will become greater and greater, so that the pole ear 101 is fully retracted by the sleeve 201 during the flattening process; in an embodiment in which the first connecting member 202 is slidably matched with the inner wall of the sleeve 201, after the pole ear 101 abuts the first folded pole ear portion 2031, as the first connecting member 202 continues to approach the battery cell 100, the first connecting member 202 can push the second flattening member 205 to continue to approach the pole ear 101 through the second elastic member 206, and the second flattening member 205 pushes the sleeve 201 to move through the second limiting portion 2014 and the third elastic member 207, and the pole ear 101 enters the interior of the sleeve 201 to a greater and greater depth, so that the pole ear 101 is fully retracted by the sleeve 201 during the flattening process.

[0063] From the above description, it can be known that when flattening the pole ear 101 of the battery cell 100, the first folding pole ear portion 2031 and the second folding pole ear portion 2051 of the pole ear flattening mechanism 200 can bend the pole ear 101 successively. The pole ear 101 of the battery cell 100 only needs to be aligned with the open end 2011 of the sleeve 201. Only one workstation is required to achieve the flattening of the pole ear 101. The battery cell 100 does not need to move between multiple flattening workstations, so it will not cause concentricity errors. The battery cell pole ear flattening has high accuracy, which improves the battery cell yield and reduces the space occupancy and hardware cost in the pole ear flattening process.

[0064] like Fig. 9 As shown, the inner wall of the sleeve 201 is provided with a first limiting portion 2013 , and one end of the first flattening member 203 away from the first elastic member 204 can abut against the first limiting portion 2013 .

[0065] More specifically, in the non-working state, due to the elastic force of the first elastic member 204 , one end of the first flattening member 203 away from the first elastic member 204 can abut against the first limiting portion 2013 to prevent the first flattening member 203 from falling off. In the working state, if the first connecting member 202 is fixedly connected to the sleeve 201, since the pole ear 101 of the battery cell 100 applies pressure to the first folding ear portion 2031, the first elastic member 204 is compressed as the first connecting member 202 moves, and the end of the first flattening member 203 away from the first elastic member 204 can leave the first limiting portion 2013; if the first connecting member 202 slides with the inner wall of the sleeve 201, then in the process of bending the pole ear 101 by the second folding ear portion 2051, the third elastic member 207 or the second limiting portion 2014 described below can push the sleeve 201 to continue to move toward the battery cell 100, so that the end of the first flattening member 203 away from the first elastic member 204 can leave the first limiting portion 2013.

[0066] like Fig. 9 As shown, the inner wall of the sleeve 201 is provided with a second limiting portion 2014 , and one end of the second flattening member 205 away from the second elastic member 206 can abut against the second limiting portion 2014 .

[0067] More specifically, in the non-working state, due to the elastic force of the second elastic member 206, the end of the second flattening member 205 away from the second elastic member 206 can abut against the second limiting portion 2014 to prevent the second flattening member 205 from falling off. In the working state, since the pole ear 101 of the battery cell 100 applies pressure to the first folded pole ear portion 2031, the first elastic member 204 is compressed, and the first connecting member 202 approaches the first flattening member 203. As the first connecting member 202 moves toward the pole ear 101 of the battery cell 100, the second elastic member 206 pushes the second folded pole ear portion 2051 to abut against the pole ear 101, and the pole ear 101 applies pressure to the second folded pole ear portion 2051. In an embodiment in which the first connecting member 202 is fixedly connected to the sleeve 201, one end of the second flattening member 205 away from the second elastic member 206 can leave the second limiting portion 2014 as the sleeve 201 moves; in an embodiment in which the first connecting member 202 and the sleeve 201 are slidably matched, the first connecting member 202 pushes the second flattening member 205 through the second elastic member 206, and the second flattening member 205 pushes the sleeve 201 to move through the second limiting portion 2014 so that the pole ear 101 penetrates a greater distance into the sleeve 201. As the first connecting member 202 further approaches the pole ear 101, the first connecting member 202 will push the third flattening member 208, and the third flattening member 208 will push the sleeve 201 through the fifth elastic member 201, so that one end of the second flattening member 205 away from the second elastic member 206 can leave the second limiting portion 2014 as the sleeve 201 moves.

[0068] like Fig. 9 As shown, a third limiting portion 2015 is provided on the inner wall of the sleeve 201 , and a third elastic member 207 is provided between one end of the second flattening member 205 away from the second elastic member 206 and the third limiting portion 2015 .

[0069] More specifically, the third elastic member 207 is disposed between the third limiting portion 2015 and the second flattening member 205. Therefore, in the embodiment where the first connecting member 202 is slidably matched with the inner wall of the sleeve 201, when the distance between the second flattening member 205 and the first connecting member 202 is further reduced, the first connecting member 202 will push the third flattening member 208 to continue to move toward the pole ear 101 through the fourth elastic member 209, and the fifth elastic member 210 will push the sleeve 201 to move toward the pole ear 101, and the open end The diameter of 2011 is greater than the diameter of the battery cell 100, so that the sleeve 201 will not abut the end of the battery cell 100, and the distance that the pole ear 101 extends into the interior of the sleeve 201 is greater, and the third elastic member 207 provides a buffer for the second folded pole ear 2051; and in an embodiment in which the first connecting member 202 is fixedly connected to the sleeve 201, after the end of the second flattening member 205 away from the second elastic member 206 leaves the second limiting portion 2014, the third elastic member 207 can provide a buffer for the second folded pole ear 2051.

[0070] like Figure 6 , Figure 7 and Fig. 9 As shown, the tab flattening mechanism 200 in this embodiment further includes a third flattening member 208. The third flattening member 208 is slidably matched with the inner wall of the second flattening member 205, and a fourth elastic member 209 is disposed between the third flattening member 208 and the first connecting member 202. The third flattening member 208 is circumferentially provided with a plurality of third folded tab portions 2081.

[0071] The folding ear angle between the first folding ear 2031 and the axis of the first flattening member 203 is α, the folding ear angle between the second folding ear 2051 and the axis of the second flattening member 205 is β, and the folding ear angle between the third folding ear 2081 and the axis of the third flattening member 208 is γ, α<β<γ.

[0072] More specifically, in this embodiment, three flattening members are used to bend the tab 101 three times and finally flatten it. Figure 6 As shown, the third flattening member 208 is circumferentially provided with a plurality of third folded pole ear portions 2081 , and the third folded pole ear portions 2081 are used to bend the pole ear 101 once so that the pole ear 101 is finally flattened.

[0073] like Figure 7 and Fig. 9 As shown, the third flattening member 208 is located inside the sleeve 201 and is slidably matched with the inner wall of the second flattening member 205, that is, the sleeve 201, the first flattening member 203, the second flattening member 205 and the third flattening member 208 are coaxially nested and slidably matched. A fourth elastic member 209 is provided between the third flattening member 208 and the first connecting member 202. When the distance between the third flattening member 208 and the first connecting member 202 decreases, the fourth elastic member 209 is compressed, so that the third folding pole ear portion 2081 applies pressure to the pole ear 101 to bend it.

[0074] Since the sleeve 201, the first flattening member 203, the second flattening member 205 and the third flattening member 208 are coaxially nested, the first flattening member 203, the second flattening member 205 and the third flattening member 208 have the same axis L. The folding angle between the first folding pole ear 2031 and the axis L is α, the folding angle between the second folding pole ear 2051 and the axis L is β, and the folding angle between the third folding pole ear 2081 and the axis L is γ, α<β<γ. In other words, the pole ear 101 first undergoes the first bending at a small angle α, then the second bending at a large angle β, and finally the third bending at the maximum angle γ is flattened. In this embodiment, γ can be an angle of 90°. If the pole ear 101 needs to be bent more times, the fourth flattening member can be nested in the third flattening member 208, and so on. The more flattening members there are, the more bending times there are.

[0075] like Fig. 9 and Fig.10 As shown, in the non-working state, the distance between the first folded pole ear 2031 and the open end 2011 is d1, the distance between the second folded pole ear 2051 and the open end 2011 is d2, and the distance between the third folded pole ear 2081 and the open end 2011 is d3. Similarly, d3 refers to the distance between the point closest to the open end 2011 in the third folded pole ear 2081 and the open end 2011, and d1<d2<d3. In other words, in the case of three flattening members, the arrangement principle that the smaller the angle of the folded pole ear is, the closer the folded pole ear of the flattening member is to the open end 2011 is still followed.

[0076] In the working state, the first connecting member 202 can move toward the first flattening member 203, the second flattening member 205 and the third flattening member 208, and the first elastic member 204, the second elastic member 206 and the fourth elastic member 209 are compressed, so that the first folding ear 2031, the second folding ear 2051 and the third folding ear 2081 can bend the pole ear 101 of the battery cell 100 in turn.

[0077] More specifically, in the working state, the first connecting member 202 can move toward the first flattening member 203, the second flattening member 205, and the third flattening member 208, and the first elastic member 204, the second elastic member 206, and the fourth elastic member 209 thus push the first flattening member 203, the second flattening member 205, and the third flattening member 208 to move. The first folding pole ear portion 2031 of the first flattening member 203 first abuts against the pole ear 101, the first elastic member 204 is compressed, and the first folding pole ear portion 2031 performs a first bend on the pole ear 101. As the first connecting member 202 continues to move toward the battery cell 100, the second folding pole ear portion 2051 abuts against the pole ear 101, the first connecting member 202 moves toward the second flattening member 205, the second elastic member 206 is compressed, and the second folding pole ear portion 2051 performs a second bend on the pole ear 101 of the battery cell 100. As the first connector 202 continues to move toward the battery cell 100, the third folded pole ear portion 2081 abuts against the pole ear 101, the first connector 202 moves toward the third flattening member 208, the fourth elastic member 209 is compressed, and the third folded pole ear portion 2081 bends the pole ear 101 of the battery cell 100 for the third time to finally flatten the pole ear 101. In this embodiment, the third folded pole ear portion 2081 bends the pole ear 101 for the last time, so γ can be 90°. When more flattening members are used, the folded pole ear angle of the folded pole ear portion of the flattening member that bends the pole ear 101 for the last time can be 90°, and γ can be less than 90°.

[0078] like Fig. 9As shown, a fourth limiting portion 2016 is disposed on the inner wall of the sleeve 201 , and a fifth elastic member 210 is disposed between one end of the third flattening member 208 away from the fourth elastic member 209 and the fourth limiting portion 2016 .

[0079] More specifically, the fifth elastic member 210 is arranged between the fourth limiting portion 2016 and the third flattening member 208. Therefore, in the non-working state, the fifth elastic member 210 can keep the third flattening member 208 inside the sleeve 201, and in the working state, in an embodiment where the first connecting member 202 and the sleeve 201 are slidingly matched, when the distance between the second flattening member 205 and the first connecting member 202 becomes smaller, the fifth elastic member 210 will push the sleeve 201 toward the pole ear 101 so that the pole ear 101 enters the sleeve 201 to a greater depth; in an embodiment where the first connecting member 202 and the sleeve 201 are fixedly connected, the fifth elastic member 210 can provide buffering for the third flattening member 208.

[0080] like Figure 8 As shown, a second pole folding ear portion 2051 and a third pole folding ear portion 2081 are disposed between two adjacent first pole folding ears 2031 .

[0081] More specifically, in Figure 8 In the embodiment, when observing along the circumferential direction of the entire sleeve 201 , the first folded pole ear portion 2031 , the second folded pole ear portion 2051 and the third folded pole ear portion 2081 are arranged alternately in sequence, so that the pole ear 101 can be bent and flattened more evenly.

[0082] like Figures 1 to 9 As shown, first, the first limiting portion 2013, the second limiting portion 2014, the third limiting portion 2015 and the fourth limiting portion 2016 can be processed on the inner wall of the sleeve 201, and then the fifth elastic member 210 is installed, and then the third elastic member 207 is installed, and then the assembled first flattening member 203, the second flattening member 205 and the third flattening member 208 are installed into the sleeve 201, and then the first elastic member 204, the second elastic member 206 and the fourth elastic member 209 are installed, and then the first connecting member 202 is installed, and finally the sleeve 201 is sealed with a blocking cover, so that a part of the first connecting member 202 passes through the through hole on the blocking cover.

[0083] like Fig.11As shown, the present application also provides a tab flattening device, comprising: at least two tab flattening mechanisms 200 as described above, the open ends 2011 of the two tab flattening mechanisms 200 are arranged opposite to each other; a battery cell clamping mechanism 300, which can clamp the battery cell 100 so that the tabs 101 at both ends of the battery cell 100 are located between the two open ends 2011; at least two first driving members 400, each of the first driving members 400 is connected to the first connecting member 202 of a tab flattening mechanism 200, and the first driving member 400 can drive the first connecting members 202 of the two tab flattening mechanisms 200 to approach each other.

[0084] More specifically, the first connecting member 202 of the tab flattening mechanism 200 can be fixedly connected to the second connecting member 211 , and then the second connecting member 211 is connected to the first driving member 400 , or the first connecting member 202 can also be directly connected to the first driving member 400 .

[0085] The cell clamping mechanism 300 first clamps the cell 100 so that the tabs 101 at both ends of the cell 100 are located between the two open ends 2011. Then, the two first driving members 400 drive the first connecting members 202 of the two tab flattening mechanisms 200 to approach each other, and accordingly, the sleeve 201 also approaches the tab 101 so that the tab 101 enters the sleeve 201.

[0086] In the embodiment where the first connecting member 202 and the sleeve 201 are slidably matched, as the first driving member 400 continues to drive the first connecting member 202 to move, the pole ear 101 abuts against the first folded pole ear portion 2031 . As the first driving member 400 continues to drive the first connecting member 202 to move, under the reaction force of the pole ear 101, the first elastic member 204 is compressed, and the first connecting member 202 approaches the first folded pole ear portion 2031 of the first flattening member 203 to perform the first bend on the pole ear 101, and the first connecting member 202 pushes the second flattening member 205 and the third flattening member 208 through the second elastic member 206 and the fourth elastic member 209 respectively, the second flattening member 205 pushes the sleeve 201 through the second limiting portion 2014 and the third elastic member 207, and the third flattening member 208 pushes the sleeve 201 through the fifth elastic member 210 and the fourth limiting portion 2016, the distance that the pole ear 101 extends into the sleeve 201 increases, and the first flattening member 203 leaves the first limiting portion 2013. The first driving member 400 continues to drive the first connecting member 202 to move, and the second folded pole ear portion 2051 abuts against the pole ear 101. Under the reaction force of the pole ear 101, the second elastic member 206 is compressed, and the first connecting member 202 approaches the second flattening member 205. The second folded pole ear portion 2051 bends the pole ear 101 for the second time. At the same time, the third elastic member 207 can buffer the second flattening member 205. The first connecting member 202 pushes the third flattening member 208 to approach the pole ear 101 through the fourth elastic member 209. The third flattening member 208 pushes the sleeve 201 axially through the fifth elastic member 210 to make the pole ear 101 extend into the sleeve 201 a greater distance to avoid accidental dispersion after bending. The first driving member 400 continues to drive the first connecting member 202 to move, and the third folded pole ear portion 2081 abuts against the pole ear 101. Under the reaction force of the pole ear 101, the fourth elastic member 209 is compressed, and the first connecting member 202 approaches the third flattening member 208. The third folded pole ear portion 2081 bends the pole ear 101 for the third time and finally flattens it. At the same time, the fifth elastic member 210 provides a buffer for the third flattening member 208.

[0087] In the embodiment where the first connecting member 202 is fixedly connected to the sleeve 201, the sleeve 201 will move as the first connecting member 202 approaches the pole ear 101, so that the distance that the pole ear 101 penetrates into the sleeve 201 continues to increase. As the first driving member 400 continues to drive the first connecting member 202 to move, the pole ear 101 abuts against the first folded pole ear portion 2031. As the first driving member 400 continues to drive the first connecting member 202 to move, under the reaction force of the pole ear 101, the first elastic member 204 is compressed, and the first connecting member 202 approaches the first folded pole ear portion 2031 of the first flattening member 203 to bend the pole ear 101 for the first time, and the first flattening member 203 leaves the first limiting portion 2013. The first driving member 400 continues to drive the first connecting member 202 to move, the second folded pole ear portion 2051 abuts against the pole ear 101, under the reaction force of the pole ear 101, the second elastic member 206 is compressed, the first connecting member 202 approaches the second flattening member 205, the second folded pole ear portion 2051 performs a second bend on the pole ear 101, and the third elastic member 207 can buffer the second flattening member 205, and the second flattening member 205 leaves the second limiting portion 2014. The first driving member 400 continues to drive the first connecting member 202 to move, the third folded pole ear portion 2081 abuts against the pole ear 101, under the reaction force of the pole ear 101, the fourth elastic member 209 is compressed, the first connecting member 202 approaches the third flattening member 208, the third folded pole ear portion 2081 performs a third bend on the pole ear 101 and finally flattens it, and the fifth elastic member 210 provides buffering for the third flattening member 208.

[0088] From the above description, it can be known that during the process of flattening the pole ear 101, the pole ear flattening device only needs one clamping of the battery cell clamping mechanism 300. The first driving member 400 drives the first connecting member 202 to move to achieve three bending and flattening of the pole ear 101. The battery cell 100 does not need to change the work station, has good concentricity, high flattening accuracy, and improved yield of the battery cell 100. The number of driving mechanisms and battery cell clamping mechanisms is small, the cost is low, and the efficiency is high.

[0089] like Fig.11 As shown, the tab flattening device in this embodiment further includes a conveying mechanism 500, and the conveying mechanism 500 is used to convey the battery cell 100 to the flattening station.

[0090] More specifically, the conveying mechanism 500 can be a conveyor belt or a cylinder that pushes the battery cell tray. The battery cell 100 is placed on the battery cell tray, and then the conveying mechanism 500 conveys the battery cell 100 to the flattening station below the battery cell clamping mechanism 300, so that the battery cell clamping mechanism 300 can clamp the battery cell 100 between the two open ends 2011.

[0091] like Fig.11As shown, in the embodiment of the present application, the battery cell clamping mechanism 300 includes a second driving member 301 and a cylinder clamp 302 , and the second driving member 301 can drive the cylinder clamp 302 to move to clamp the battery cell 100 transported by the transport mechanism 500 .

[0092] More specifically, the second driving member 301 can drive the cylinder clamp 302 to approach the battery cell 100 on the conveying mechanism 500, and then the cylinder clamp 302 moves to clamp the battery cell 100. The second driving member 301 then drives the cylinder clamp 302 away from the conveying mechanism 500 to place the battery cell 100 between the two open ends 2011, and the conveying mechanism 500 continues to convey the next battery cell 100 to be flattened.

[0093] In other embodiments of the present application, the battery cell clamping mechanism 300 may adopt a multi-degree-of-freedom manipulator to clamp the battery cell 100 from the conveyor belt and then place the battery cell 100 between the two open ends 2011 .

[0094] The first driving member 400 and the second driving member 301 can be mounted on the same mounting plate.

[0095] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0096] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A tab flattening mechanism, characterized in that: include: a sleeve having an open end and a closed end; a first connecting member, the first connecting member being at least partially disposed inside the sleeve; A first flattening member, wherein the first flattening member is slidably matched with the inner wall of the sleeve, a first elastic member is arranged between the first flattening member and the first connecting member, and a plurality of first folding ear portions are arranged circumferentially on the first flattening member; A second flattening member, wherein the second flattening member is slidably matched with the inner wall of the first flattening member, a second elastic member is arranged between the second flattening member and the first connecting member, and a plurality of second folding ear portions are arranged in the circumferential direction of the second flattening member; The folding ear angle between the first folding ear portion and the axis of the first flattening member is not equal to the folding ear angle between the second folding ear portion and the axis of the second flattening member; In the non-working state, the one with the smaller folding ear angle between the first folding ear and the second folding ear is closer to the opening end; in the working state, the first connecting member can move toward the first flattening member and the second flattening member, and the first elastic member and the second elastic member are compressed, so that the first folding ear and the second folding ear can bend the ear of the battery cell successively.

2. The tab flattening mechanism according to claim 1, characterized in that: A first limiting portion is disposed on the inner wall of the sleeve, and one end of the first flattening member away from the first elastic member can abut against the first limiting portion.

3. The tab flattening mechanism according to claim 2, characterized in that: A second limiting portion is disposed on the inner wall of the sleeve, and one end of the second flattening member away from the second elastic member can abut against the second limiting portion.

4. The tab flattening mechanism according to claim 3, characterized in that: A third limiting portion is disposed on the inner wall of the sleeve, and a third elastic member is disposed between an end of the second flattening member away from the second elastic member and the third limiting portion.

5. The tab flattening mechanism according to claim 1, characterized in that: It also includes a third flattening member, the third flattening member is slidably matched with the inner wall of the second flattening member, a fourth elastic member is arranged between the third flattening member and the first connecting member, and a plurality of third folding ear portions are circumferentially arranged on the third flattening member; The folding ear angle between the first folding ear and the axis of the first flattening member is α, the folding ear angle between the second folding ear and the axis of the second flattening member is β, and the folding ear angle between the third folding ear and the axis of the third flattening member is γ, α<β<γ.

6. The tab flattening mechanism according to claim 5, characterized in that: In the non-working state, the distance between the first folding ear and the open end is d1, the distance between the second folding ear and the open end is d2, and the distance between the third folding ear and the open end is d3, d1<d2<d3; in the working state, the first connecting member can move toward the first flattening member, the second flattening member and the third flattening member, and the first elastic member, the second elastic member and the fourth elastic member are compressed, so that the first folding ear, the second folding ear and the third folding ear can bend the ear of the battery cell in turn.

7. The tab flattening mechanism according to claim 5, characterized in that: A fourth limiting portion is disposed on the inner wall of the sleeve, and a fifth elastic member is disposed between an end of the third flattening member away from the fourth elastic member and the fourth limiting portion.

8. The tab flattening mechanism according to claim 5, characterized in that: A second pole folding ear portion and a third pole folding ear portion are arranged between two adjacent first pole folding ears portions.

9. A tab flattening device, characterized in that: include: At least two tab flattening mechanisms according to any one of claims 1 to 8, wherein the opening ends of the two tab flattening mechanisms are arranged opposite to each other; A battery cell clamping mechanism, wherein the battery cell clamping mechanism is capable of clamping the battery cell so that the tabs at both ends of the battery cell are located between the two open ends; At least two first driving members, each of which is connected to a first connecting member of the tab flattening mechanism, and the first driving member can drive the first connecting members of the two tab flattening mechanisms to approach each other.

10. The tab flattening device according to claim 9, characterized in that: It also includes a conveying mechanism, which is used to convey the battery cells to the flattening station.

11. The tab flattening device according to claim 10, characterized in that: The battery cell clamping mechanism comprises a second driving member and a cylinder clamp, and the second driving member can drive the cylinder clamp to move so as to clamp the battery cell transported by the transport mechanism.

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