Battery cell outer tab and battery cell

Abstract

The invention relates to the technical field of batteries, and discloses an outer tab of a battery cell and the battery cell. Wherein the outer tab of the battery cell comprises a tab body, and one end of the tab body is provided with a welding area for being welded with a pole group of the battery cell; a blocking region is arranged on the tab body, and is arranged on one side, far away from a pole group of the battery cell, of the welding region; the blocking region is used for blocking the welding stress from being transmitted along the length direction of the tab body; and in the length direction of the tab body, at least part of the orthographic projection of the welding area towards the blocking area is located in the blocking area. According to the invention, the blocking area is arranged on the tab body, so that stress generated in the welding process can be prevented from being continuously transmitted on the tab body in the direction away from the pole group, and the tab body can be further prevented from being deformed under the influence of the stress.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cell external pole ear and a battery cell. Background Art

[0002] In order to ensure the stability of current flow between the outer pole ear of the battery cell and the electrode group in the battery cell, ultrasonic pressure welding is generally used to weld the inner pole ear of the battery cell on the electrode group with the outer pole ear (positive pole ear or negative pole ear) of the battery cell.

[0003] However, since the thickness of the outer pole ear of the battery cell is relatively thin, the stress generated during the welding process may cause the outer pole ear of the battery cell to deform and affect the sealing of the connection between the outer pole ear of the battery cell and the packaging film. Summary of the invention

[0004] In view of this, the present invention provides a battery cell outer tab and a battery cell to solve the problem that the outer tab is easily deformed during welding.

[0005] In a first aspect, the present invention provides a battery cell outer terminal ear, comprising:

[0006] The tab body has a welding area formed at one end for welding with the pole group of the battery cell; the tab body is provided with a barrier area, which is arranged on a side of the welding area away from the pole group of the battery cell; the barrier area is used to prevent the welding stress from being transmitted along the length direction of the tab body;

[0007] Along the length direction of the tab body, an orthographic projection of the welding area toward the blocking area is at least partially located within the blocking area.

[0008] Beneficial effect: The present invention can block the stress generated during welding from being continuously transmitted on the tab body in the direction away from the pole group by setting a barrier area on the tab body, thereby preventing the tab body from being deformed under the influence of the above stress. In this way, it helps to ensure the flatness of the outer tab of the battery cell, and ensure that the outer tab of the battery cell can be tightly connected with the packaging film of the battery cell when the battery cell is produced, avoiding unnecessary gaps between the two, which affects the sealing of the battery cell and the product yield.

[0009] In an optional embodiment, along the width direction of the tab body, at least one end of the welding area is located outside the barrier area, and the distance between the end of the welding area outside the barrier area and the end of the adjacent barrier area is W1, and the range of W1 is W1≤10mm.

[0010] Beneficial effects: To ensure that the outer pole ear of the battery cell and the inner pole ear of the battery cell can be firmly connected together, and to ensure that the current can stably flow between the outer pole ear of the battery cell and the pole group of the battery cell. It is usually necessary to reserve a relatively large welding area on the outer pole ear of the battery cell and the inner pole ear of the battery cell. At this time, if both ends of the barrier area are located outside the welding area, although this solution can use the barrier area to quickly offset the stress generated during the welding process, it will remove more metal materials from the pole ear body, so the self-strength and current carrying capacity of the pole ear body will be affected to a certain extent. Based on the above reasons, the present invention sets at least one end of the welding area on the outside of the barrier area, and controls the spacing W1 between the end of the welding area located on the outside and the end of the adjacent barrier area to within 10mm, which can ensure that the stress generated during the welding process is offset while making the pole ear body have sufficient structural strength and reduce the possibility of fracture due to stress. In addition, the pole ear body can also meet the high-rate current requirements of the battery cell.

[0011] In an optional embodiment, the number of the barrier regions is n, and the n barrier regions are arranged at intervals along the width direction of the tab body; wherein n is a positive integer ≥1.

[0012] Beneficial effect: Compared with setting a larger barrier area, setting multiple barrier areas at intervals along the width direction of the pole ear body can effectively share stress and reduce stress concentration that causes deformation, fracture and other failures of the pole ear body. In addition, by setting multiple barrier areas, it is also possible to reduce the waste of pole ear body materials and ensure the current capacity of the pole ear body. On the contrary, compared with setting multiple barrier areas, setting a larger barrier area in the width direction of the pole ear body will be easier to manufacture and process, shorten the time required to produce batteries, and improve production efficiency. In addition, when multiple barrier areas are set, since the multiple barrier areas are set at intervals, the stress generated in the welding area during the welding process may pass through the interval between two adjacent barrier areas and be transmitted to the end of the outer pole ear of the battery cell away from the pole group. Therefore, by setting a larger barrier area, the continuity of the barrier area on the pole ear body can be guaranteed, the possibility of deformation of the pole ear body away from the pole group is reduced, and the flatness of the pole ear body is guaranteed.

[0013] In an optional embodiment, along the width direction of the tab body, the size of the barrier zone is L1, the spacing between two adjacent barrier zones is L2, the size of the welding area is L3, and L3 satisfies 0.1≤L3 / (nL1+(n-1)L2)≤1.2 with L1 and L2; wherein, the range of L1 is 1mm≤L1≤150mm; the range of L2 is 1mm≤L2≤10mm; the range of (nL1+(n-1)L2) is 1mm≤(nL1+(n-1)L2)≤150mm; the range of L3 is 2mm≤L3≤100mm.

[0014] Beneficial effect: By setting the length L1 of the barrier zone, the spacing L2 between two adjacent barrier zones, and the size L3 of the welding zone according to the above parameters, on the one hand, it can prevent the size L3 of the welding zone from being too large, causing multiple barrier zones to lose the ability to offset deformation forces, affecting the sealing effect between the end of the tab body away from the pole group and the packaging film; on the other hand, it can also prevent the size L3 of the welding zone from being too small, causing excessive waste of material of the tab body, affecting the structural strength and current-carrying capacity of the tab body.

[0015] In an optional embodiment, the size of the tab body is W2, the range of W2 is 3mm≤W2≤200mm, and the size W2 of the tab body and the size L1 of the barrier area satisfy 0.1≤nL1 / W2≤0.8.

[0016] Beneficial effect: If the proportion of multiple barrier areas on the tab body is too large, the tab body will easily deform or break under the action of mechanical equipment, thereby affecting the subsequent assembly and performance of the battery cell. If the proportion of multiple barrier areas on the tab body is too small, the barrier areas are not used to offset the stress generated during welding. Furthermore, when the size L1 of the barrier area is adapted and fixed to the size L3 of the welding area, if the proportion of multiple barrier areas on the tab body is too small, this means that the tab body has a larger width. Therefore, in this case, the tab body will occupy more installation space, affecting the space utilization and energy density of the battery cell. It can be seen that by setting the size W2 of the tab body according to the above parameters, it can not only ensure that the tab body has a reasonable size, but also ensure that the tab body has good structural strength.

[0017] In an optional embodiment, n of the barrier areas are grooves, along the thickness direction of the battery cell, wherein the openings of a portion of the grooves face a first direction, and the openings of another portion of the grooves face a second direction, and the first direction is opposite to the second direction; wherein n is a positive integer ≥2.

[0018] Beneficial effects: The present invention can enhance the symmetry of the structure, reduce structural deformation or damage caused by stress concentration, and improve the overall stability of the structure by setting barrier areas on opposite sides of the tab body in the thickness direction.

[0019] In an optional implementation, the n barrier regions are through holes.

[0020] Beneficial effects: By setting a through hole on the tab body, on the one hand, the processing and manufacturing process of the outer tab of the battery cell can be simplified and the production efficiency can be improved; on the other hand, the weight of the outer tab of the battery cell can be reduced, which is conducive to achieving lightweight of the battery cell.

[0021] In an optional embodiment, along the width direction of the tab body, the distance between the end of the barrier region and the edge of the adjacent tab body is W3, and the range of W3 is 3mm≤W3≤100mm.

[0022] Beneficial effect: By setting the distance W3 between the end of the barrier zone and the edge of the adjacent tab body according to the above parameters, it is possible to avoid the deterioration of the structural strength of the tab body where the barrier zone is provided, thereby ensuring that the tab body has good structural strength.

[0023] In a second aspect, the present invention further provides a battery cell, comprising:

[0024] The electrode group is provided with an inner electrode ear of the battery cell;

[0025] A packaging film is wrapped around the outer sides of the electrode group and the electrode ears in the battery cell and forms a packaging edge around the electrode group and the electrode ears in the battery cell;

[0026] The above-mentioned outer tab of the battery cell, one end of the tab body is welded to the inner tab of the battery cell through the welding area, and the other end extends out of the packaging edge;

[0027] The insulating member is arranged on the tab body and is located on a side of the barrier region away from the tab in the battery cell along the length direction of the tab body to connect the tab body with the packaging edge.

[0028] Beneficial effects: Since the tabs are usually made of metal and have no adhesive properties, by connecting the insulating member to the tabs, on the one hand, the tabs can be firmly connected to the edge of the package; on the other hand, the gap between the tabs and the edge of the package can be effectively filled and sealed to ensure the sealing of the connection between the edge of the package and the tabs. Furthermore, by arranging the insulating member on the side of the barrier area away from the tabs in the battery cell, the ability of the barrier area to offset the stress during welding can also be utilized to avoid the stress during welding causing the insulating member and the tabs or the sealing flange to peel off and warp, causing leakage of electrolyte and affecting the sealing of the battery cell.

[0029] In an optional implementation, along the length direction of the tab body, the distance between the barrier area and the insulating member is W4, and the range of W4 is 0.3 mm≤W4≤10 mm.

[0030] Beneficial effect: By setting the distance W4 between the barrier area and the insulating member according to the above parameters, on the one hand, it is convenient to stick the insulating member on the tab body; on the other hand, it can avoid wasting space and materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a schematic diagram of the structure of an outer terminal ear of a battery cell according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

[0034] Figure 3 for Figure 2 A is a partial enlarged schematic diagram of the middle part.

[0035] Description of reference numerals:

[0036] 1. Tab body; 101. Welding area; 2. Barrier area; 3. Pole group; 301. Tab inside the battery cell; 4. Insulating part. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] In view of the problem that the outer pole ear is easily deformed during the welding process, the present invention provides an outer pole ear of a battery cell and a battery cell.

[0039] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0040] According to an embodiment of the present invention, on the one hand, Figures 1 to 3 As shown, a battery cell external tab is provided, comprising: a tab body 1. Specifically, a welding area 101 for welding with a pole group 3 of a battery cell is formed at one end of the tab body 1; a barrier area 2 is provided on the tab body 1, and the barrier area 2 is arranged on a side of the welding area 101 away from the pole group 3 of the battery cell; the barrier area 2 is used to prevent the welding stress from being transmitted along the length direction of the tab body 1; along the length direction of the tab body 1, the orthographic projection of the welding area 101 toward the barrier area 2 is at least partially located in the barrier area 2.

[0041] This embodiment, by providing a barrier area 2 on the tab body 1, can block the stress generated during the welding process from being continuously transmitted on the tab body 1 in the direction away from the pole group 3, thereby preventing the tab body 1 from being deformed under the influence of the above stress. In this way, it is helpful to ensure the flatness of the outer tab of the battery cell, and ensure that the outer tab of the battery cell can be tightly connected with the packaging film of the battery cell during the production of the battery cell, avoiding unnecessary gaps between the two, which affects the sealing and product yield of the battery cell.

[0042] It should be noted that the length direction of the tab body 1 in this embodiment is Figures 1 to 3 The direction shown in is consistent.

[0043] It should be noted that in this embodiment, the situation in which the orthographic projection of the welding area 101 toward the barrier area 2 is at least partially located in the barrier area 2 may be but is not limited to the following situations: 1. Along the width direction of the tab body 1, at least one end of the welding area 101 is located outside the barrier area 2; 2. Along the width direction of the tab body 1, both ends of the welding area 101 are not outside the barrier area 2.

[0044] According to one embodiment of the present invention, Figures 2 to 3 As shown, along the width direction of the tab body 1, at least one end of the welding area 101 is located outside the barrier area 2, and the distance between the end of the welding area 101 outside the barrier area 2 and the end of the adjacent barrier area 2 is W1, and the range of W1 is W1≤10mm. To ensure that the outer tab of the battery cell and the inner tab 301 of the battery cell can be firmly connected together, and to ensure that the current can stably flow between the outer tab of the battery cell and the electrode group 3 of the battery cell. It is usually necessary to reserve a relatively large welding area 101 on the outer tab of the battery cell and the inner tab 301 of the battery cell. At this time, if both ends of the barrier area 2 are located outside the welding area 101, although this solution can use the barrier area 2 to quickly offset the stress generated during welding, it will remove more metal materials from the tab body 1, so the self-strength and current-carrying capacity of the tab body 1 will be affected to a certain extent. Based on the above reasons, the present invention sets at least one end of the welding area 101 outside the barrier area 2, and controls the distance W1 between the end of the welding area 101 located outside and the end of the adjacent barrier area 2 to be within 10 mm, which can ensure that the stress generated during the welding process is offset, and at the same time, the tab body 1 has sufficient structural strength to reduce the possibility of fracture due to stress. In addition, the tab body 1 can also meet the high-rate overcurrent requirements of the battery cell.

[0045] It should be noted that in this embodiment, the width direction of the tab body 1 is Figures 1 to 3 The direction shown in is consistent.

[0046] According to one embodiment of the present invention, Figures 1 to 3 As shown, there are n barrier areas 2, and n barrier areas 2 are arranged at intervals along the width direction of the pole ear body 1; wherein n is a positive integer ≥ 1. Compared with setting a larger barrier area 2, setting multiple barrier areas 2 at intervals along the width direction of the pole ear body 1 can effectively share the stress and reduce the stress concentration that causes deformation, fracture and other failures of the pole ear body 1. In addition, by setting multiple barrier areas 2, the waste of materials of the pole ear body 1 can also be reduced, and the current capacity of the pole ear body 1 can be guaranteed. On the contrary, compared with setting multiple barrier areas 2, setting a larger barrier area 2 in the width direction of the pole ear body 1 will be easier to manufacture and process, shorten the time required for producing the battery cell, and improve production efficiency. In addition, when multiple barrier areas 2 are set, since the multiple barrier areas 2 are set at intervals, the stress generated in the welding area 101 during the welding process may pass through the interval between two adjacent barrier areas 2 and be transmitted to the end of the outer pole ear of the battery cell away from the pole group 3. Therefore, by providing a relatively large barrier area 2 , the continuity of the barrier area 2 on the tab body 1 can be ensured, the possibility of deformation of the tab body 1 at the end away from the pole group 3 can be reduced, and the flatness of the tab body 1 can be ensured.

[0047] It should be noted that the cross-sectional shape of the barrier area 2 in this embodiment can be, but is not limited to, a trapezoid, a parallelogram, a circle, a triangle, a rhombus, and an ellipse. In addition, when a plurality of barrier areas 2 are provided on the tab body 1, the length and shape of each barrier area 2 can be the same or different, as long as they can cooperate with each other to offset the stress generated during welding.

[0048] According to one embodiment of the present invention, Figure 3 As shown, along the width direction of the tab body 1, the size of the barrier zone 2 is L1, the spacing between two adjacent barrier zones 2 is L2, the size of the welding area 101 is L3, and L3 satisfies 0.1≤(nL1+(n-1)L2)≤1.2 with L1 and L2; wherein, the range of L1 is 1mm≤L1≤150mm; the range of L2 is 1mm≤L2≤10mm; the range of (nL1+(n-1)L2) is 1mm≤(nL1+(n-1)L2)≤150mm; the range of L3 is 2mm≤L3≤100mm. By setting the size L1 of the barrier area 2, the spacing L2 between two adjacent barrier areas 2, and the size L3 of the welding area 101 according to the above parameters, on the one hand, it is possible to prevent the size L3 of the welding area 101 from being too large, causing the multiple barrier areas 2 to lose the ability to offset the deformation force, affecting the sealing effect between the end of the tab body 1 away from the pole group 3 and the packaging film; on the other hand, it is also possible to prevent the size L3 of the welding area 101 from being too small, causing excessive waste of material of the tab body 1, affecting the structural strength and current flow capacity of the tab body 1.

[0049] According to one embodiment of the present invention, Figure 3 As shown, the size of the tab body 1 is W2, and the range of W2 is 3mm≤W2≤200mm, and the size W2 of the tab body 1 and the size L1 of the barrier area 2 satisfy 0.1≤nL1 / W2≤0.8. If the proportion of multiple barrier areas 2 on the tab body 1 is too large, the tab body 1 is easily deformed or broken under the action of mechanical equipment, thereby affecting the subsequent assembly and performance of the battery cell. If the proportion of multiple barrier areas 2 on the tab body 1 is too small, the barrier area 2 is not used to offset the stress generated during the welding process. Further, when the size L1 of the barrier area 2 is adapted and fixed to the size L3 of the welding area 101, if the proportion of multiple barrier areas 2 on the tab body 1 is too small, this indicates that the tab body 1 has a larger width. Therefore, in this case, the tab body 1 will occupy more installation space, affecting the space utilization and energy density of the battery cell. It can be seen that by setting the size W2 of the tab body 1 according to the above parameters, it can not only ensure that the tab body 1 has a reasonable size, but also ensure that the tab body 1 has a good structural strength.

[0050] According to one embodiment of the present invention, n barrier regions 2 are sinks, and along the thickness direction of the battery cell, the notches of some of the sinks face the first direction, and the notches of other sinks face the second direction, and the first direction is opposite to the second direction; wherein n is a positive integer ≥ 2. In this embodiment, by providing barrier regions 2 on opposite sides of the thickness direction of the tab body 1, the symmetry of the structure can be enhanced, the deformation or damage of the structure caused by stress concentration can be reduced, and the overall stability of the structure can be improved.

[0051] According to one embodiment of the present invention, the n barrier regions 2 are through holes. In this embodiment, by providing through holes on the tab body 1, the processing and manufacturing process of the outer tab of the battery cell can be simplified to improve production efficiency; on the other hand, the weight of the outer tab of the battery cell can be reduced, which is conducive to achieving lightweight of the battery cell.

[0052] According to one embodiment of the present invention, Figure 3 As shown, along the width direction of the tab body 1, the distance between the end of the barrier region 2 and the edge of the adjacent tab body 1 is W3, and the range of W3 is 3mm≤W3≤100mm. By setting the distance W3 between the end of the barrier region 2 and the edge of the adjacent tab body 1 according to the above parameters, the structural strength of the location where the barrier region 2 is provided on the tab body 1 can be prevented from being deteriorated, ensuring that the tab body 1 has a good structural strength.

[0053] According to an embodiment of the present invention, on the other hand, Figure 2 and Figure 3 As shown, a battery cell is also provided, comprising: a pole group 3, a packaging film, the above-mentioned battery cell outer pole ear and an insulating member 4.

[0054] Specifically, the electrode group 3 is provided with an inner electrode tab 301 of the battery cell; the packaging film is wrapped around the outer side of the electrode group 3 and the inner electrode tab 301 of the battery cell and forms a packaging edge around the electrode group 3 and the inner electrode tab 301 of the battery cell; one end of the electrode tab body 1 is welded to the inner electrode tab 301 of the battery cell through the welding area 101, and the other end extends out of the packaging edge; the insulating member 4 is arranged on the electrode tab body 1 and is located on the side of the barrier area 2 along the length direction of the electrode tab body 1 away from the inner electrode tab 301 of the battery cell to connect the electrode tab body 1 and the packaging edge.

[0055] It is understandable that, since the pole tab is usually made of metal and has no adhesiveness, by connecting the insulating member 4 to the pole tab, on the one hand, the pole tab can be firmly connected to the package edge; on the other hand, the gap between the pole tab and the package edge can be effectively filled and sealed to ensure the sealing of the connection between the package edge and the pole tab. Furthermore, the insulating member 4 is arranged on the side of the barrier region 2 away from the pole tab 301 in the battery cell, and the ability of the barrier region 2 to offset the stress during welding can also be used to avoid the stress during welding causing the insulating member 4 to peel off and warp from the pole tab or the sealing flange, causing leakage of electrolyte and affecting the sealing of the battery cell.

[0056] According to one embodiment of the present invention, Figure 3 As shown, along the length direction of the tab body 1, the distance between the barrier area 2 and the insulating member 4 is W4, and the range of W4 is 0.3mm≤W4≤10mm. By setting the distance W4 between the barrier area 2 and the insulating member 4 according to the above parameters, on the one hand, it is convenient to stick the insulating member 4 on the tab body 1; on the other hand, it can avoid wasting space and materials.

[0057] In conjunction with the following Table 1, the sealing effect of the battery cell provided by the embodiment of the present invention is verified through several groups of test examples.

[0058] Example 1

[0059] The sum of the lengths of the n blocking zones is set to 5 mm, the spacing L2 is set to 3.3 mm, the size L3 is set to 10 mm, the spacing W1 is set to 3 mm, and the size W2 is set to 30 mm;

[0060] Example 2

[0061] The sum of the lengths of the n blocking zones is set to 32 mm, the spacing L2 is set to 2 mm, the size L3 is set to 20 mm, the spacing W1 is set to 1 mm, and the size W2 is set to 40 mm;

[0062] Example 3

[0063] The sum of the lengths of the n blocking zones is set to 93 mm, the spacing L2 is set to 7 mm, the size L3 is set to 20 mm, the spacing W1 is set to 10 mm, and the size W2 is set to 150 mm;

[0064] Example 4

[0065] The sum of the lengths of the n blocking zones is set to 70 mm, the spacing L2 is set to 10 mm, the size L3 is set to 70 mm, the spacing W1 is set to 2 mm, and the size W2 is set to 100 mm;

[0066] Example 5

[0067] The sum of the lengths of the n blocking zones is set to 60 mm, the spacing L2 is set to 6 mm, the size L3 is set to 50 mm, the spacing W1 is set to 5 mm, and the size W2 is set to 80 mm;

[0068] Comparative Example 1

[0069] The sum of the lengths of the n blocking zones is set to 6 mm, the spacing L2 is set to 2.1 mm, the size L3 is set to 10 mm, the spacing W1 is set to 2 mm, and the size W2 is set to 20 mm;

[0070] Comparative Example 2

[0071] The sum of the lengths of the n blocking zones is set to 62.8 mm, the spacing L2 is set to 1.2 mm, the size L3 is set to 22 mm, the spacing W1 is set to 1 mm, and the size W2 is set to 40 mm;

[0072] Comparative Example 3

[0073] The sum of the lengths of the n blocking zones is set to 93 mm, the spacing L2 is set to 7 mm, the size L3 is set to 90 mm, the spacing W1 is set to 11 mm, and the size W2 is set to 150 mm;

[0074] Comparative Example 4

[0075] The sum of the lengths of the n blocking areas is set to 69 mm, the spacing L2 is set to 11 mm, the size L3 is set to 70 mm, the spacing W1 is set to 5 mm, and the size W2 is set to 100 mm.

[0076] Table 1

[0077]

[0078]

[0079] From the comparison between the embodiment and the comparative example in Table 1, it can be seen that when L3 / (nL1+L2) is greater than 1.2, the outer pole ear is obviously deformed after the inner pole ear and the outer pole ear are ultrasonically welded; when nL1 / W2 is greater than 0.8, the pole ear body 1 is easily deformed or broken under the action of mechanical equipment; when the spacing W1 is greater than 10mm, the outer pole ear is obviously deformed after the inner pole ear and the outer pole ear are ultrasonically welded; when the spacing L2 is greater than 10mm, the outer pole ear is obviously deformed after the inner pole ear and the outer pole ear are ultrasonically welded.

[0080] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cell outer ear, characterized in that: include: The tab body has a welding area formed at one end for welding with the pole group of the battery cell; the tab body is provided with a barrier area, which is arranged on a side of the welding area away from the pole group of the battery cell; the barrier area is used to prevent the welding stress from being transmitted along the length direction of the tab body; Along the length direction of the tab body, an orthographic projection of the welding area toward the blocking area is at least partially located within the blocking area.

2. The battery cell outer terminal ear according to claim 1, characterized in that: Along the width direction of the tab body, at least one end of the welding area is located outside the barrier area, and the distance between the end of the welding area outside the barrier area and the end of the adjacent barrier area is W1, and the range of W1 is W1≤10mm.

3. The battery cell outer terminal ear according to claim 2, characterized in that: There are n barrier regions, and the n barrier regions are arranged at intervals along the width direction of the tab body; wherein n is a positive integer ≥1.

4. The battery cell outer terminal ear according to claim 3, characterized in that: Along the width direction of the tab body, the size of the barrier zone is L1, the spacing between two adjacent barrier zones is L2, the size of the welding area is L3, and L3 satisfies 0.1≤L3 / (nL1+(n-1)L2)≤1.2 with L1 and L2; wherein, the range of L1 is 1mm≤L1≤150mm; the range of L2 is 1mm≤L2≤10mm; the range of (nL1+(n-1)L2) is 1mm≤(nL1+(n-1)L2)≤150mm; the range of L3 is 2mm≤L3≤100mm.

5. The battery cell outer terminal ear according to claim 4, characterized in that: The size of the tab body is W2, and the range of W2 is 3mm≤W2≤200mm. The size W2 of the tab body and the size L1 of the barrier area satisfy 0.1≤nL1 / W2≤0.

8.

6. The battery cell outer terminal ear according to claim 3, characterized in that: The n barrier areas are grooves, along the thickness direction of the battery cell, wherein the openings of some of the grooves face a first direction, and the openings of other parts of the grooves face a second direction, and the first direction is opposite to the second direction; wherein n is a positive integer ≥2.

7. The battery cell outer terminal ear according to claim 3, characterized in that: The n blocking areas are through holes.

8. The battery cell outer terminal ear according to any one of claims 1 to 6, characterized in that: Along the width direction of the tab body, the distance between the end of the barrier region and the edge of the adjacent tab body is W3, and the range of W3 is 3mm≤W3≤100mm.

9. A battery cell, characterized in that: include: The electrode group is provided with an inner electrode ear of the battery cell; A packaging film is wrapped around the outer sides of the electrode group and the electrode ears in the battery cell and forms a packaging edge around the electrode group and the electrode ears in the battery cell; The battery cell external tab according to any one of claims 1 to 8, wherein one end of the tab body is welded to the battery cell internal tab through the welding area, and the other end extends out of the packaging edge; The insulating member is arranged on the tab body and is located on a side of the barrier region away from the tab in the battery cell along the length direction of the tab body to connect the tab body with the packaging edge.

10. The battery cell according to claim 9, characterized in that: Along the length direction of the tab body, the distance between the barrier area and the insulating member is W4, and the range of W4 is 0.3 mm≤W4≤10 mm.

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