Tab welding protection sheet and battery

Abstract

The utility model provides a tab welding protection sheet and a battery, the tab welding protection sheet comprises at least two sub-protection sheets arranged along a first direction, and two adjacent sub-protection sheets are connected through a connecting part; the size of the connecting part in the second direction is smaller than that of the sub-protection sheets in the second direction and / or the connecting part is of a curved surface structure, so that the connecting part can be of a buffer structure or a buffer opening is formed between every two adjacent sub-protection sheets by specially limiting the size and / or the structural morphology of the connecting part; the buffering structure or the buffering opening can provide a certain buffering space for welding impact force, the welding impact force is prevented from reaching the protection sub-pieces, and then the two protection sub-pieces are protected against deformation or upwarp under welding impact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a tab welding protection sheet and a battery. BACKGROUND

[0002] The adapter piece is used to connect the tab of the battery cell and the pole of the top cover assembly. When the adapter piece is directly ultrasonically welded with the tab, the tab is easy to be broken by vibration and easy to be adhered to the welding head. In order to reduce the probability of the tab being broken by vibration or adhered to the welding head when the adapter piece is ultrasonically welded with the tab, a welding protection sheet is usually arranged between the welding head and the tab to protect the tab from being broken by vibration or adhered to the welding head. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a tab welding protection sheet and a battery to solve or partially solve the problems in the background art.

[0004] To achieve the above purpose, the first aspect of the present application provides a tab welding protection sheet, comprising at least two sub-protection sheets arranged along a first direction, each of the sub-protection sheets being used to connect with a tab, and two adjacent sub-protection sheets being connected through a connecting part, the size of the connecting part in a second direction being smaller than the size of the sub-protection sheet in the second direction and / or the connecting part being a curved surface structure, and the first direction intersecting with the second direction.

[0005] Optionally, the connecting part comprises at least one connecting sub-part, and the at least one connecting sub-part is arranged along the second direction or spaced apart.

[0006] Optionally, the ratio of the sum of the sizes of the connecting sub-parts in the second direction to the size of the sub-protection sheet in the second direction is 1:10-5:10.

[0007] Optionally, the ratio of the size of the connecting sub-part in the first direction to the size of the tab welding protection sheet in the first direction is 0.1:10-2:10.

[0008] Optionally, at least one buffer opening is arranged between two adjacent sub-protection sheets, the buffer opening and the connecting sub-part are arranged alternately in the second direction, and the size of the buffer opening in the first direction is smaller than or equal to the size of the connecting sub-part in the first direction.

[0009] Optionally, the connecting part is provided with two connecting sub-parts, the buffer opening is provided with one, the two connecting sub-parts are respectively located on both sides of the buffer opening, and the sizes of the two connecting sub-parts in the second direction are different.

[0010] Optionally, the connecting sub-part is provided with one, the buffer opening is provided with two, and the two buffer openings are respectively located on the two sides of the connecting sub-part, and the sizes of the two buffer openings in the second direction are different.

[0011] Optionally, the connecting sub-part is provided with at least two, the buffer opening is provided with at least two, and the connecting sub-part and the buffer opening are staggered.

[0012] Optionally, in a plane perpendicular to the tab welding protection sheet, the cross-sectional shape of the connecting part is at least one of an arc shape, a semicircular shape, a triangular shape, and a Z shape.

[0013] The second aspect of the application provides a battery comprising the tab welding protection sheet of any one of the first aspect, at least two battery cells, and an adapter sheet, each of the battery cells comprises a tab, the tab is located between the adapter sheet and the tab welding protection sheet, and is connected with the adapter sheet and the tab welding protection sheet, and each of the sub-protection sheets of the tab welding protection sheet is connected with a tab.

[0014] Optionally, a top cover is further included, the top cover is connected with the adapter sheet, and the ratio of the size of the tab welding protection sheet in the first direction to the size of the top cover in the first direction is 0.7:1-0.9:1.

[0015] As can be seen from the above, the tab welding protection sheet and the battery provided by the application, the tab welding protection sheet comprises at least two sub-protection sheets arranged along a first direction, and two adjacent sub-protection sheets are connected through a connecting part, and the size of the connecting part in a second direction is smaller than the size of the sub-protection sheet in the second direction and / or the connecting part is a curved surface structure, thus, by limiting the size and / or structure of the connecting part, the connecting part itself can serve as a buffer structure or there is a buffer opening between the two adjacent sub-protection sheets, the buffer structure or the buffer opening can provide a certain buffer space for the welding impact force, so as to avoid the welding impact force affecting the sub-protection sheet, and further to protect the two sub-protection sheets from being deformed or warped under the impact of welding. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0017] Figure 1 A first structure schematic diagram of the tab welding protection sheet of the embodiment of the application is shown;

[0018] Figure 2 Fig. 2 shows a second structural schematic diagram of the tab welding protection sheet according to an embodiment of the present application;

[0019] Figure 3 Fig. 3 shows a third structural schematic diagram of the tab welding protection sheet according to an embodiment of the present application;

[0020] Figure 4 Fig. 4 shows a fourth structural schematic diagram of the tab welding protection sheet according to an embodiment of the present application;

[0021] Figure 5 Fig. 5 shows a fifth structural schematic diagram of the tab welding protection sheet according to an embodiment of the present application;

[0022] Figure 6 Fig. 6 shows a sixth structural schematic diagram of the tab welding protection sheet according to an embodiment of the present application;

[0023] Figure 7 Fig. 7 shows a seventh structural schematic diagram of the tab welding protection sheet according to an embodiment of the present application;

[0024] Figure 8 Fig. 8 shows an eighth structural schematic diagram of the tab welding protection sheet according to an embodiment of the present application;

[0025] Figure 9 Fig. 9 shows a structural schematic diagram of a battery according to an embodiment of the present application.

[0026] In the figure: 1, tab welding protection sheet; 11, sub protection sheet; 12, connecting part; 121, connecting subpart; 13, buffer opening; 2, battery cell; 21, tab; 211, welding mark area; 3, adapter sheet; 4, top cover. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with specific embodiments and with reference to the drawings.

[0028] It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by those skilled in the art to which the present application belongs, unless otherwise defined. The terms "first", "second", and similar terms used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] The tab is used to connect the tab of the battery cell and the pole of the top cover assembly. When the tab and the tab are directly ultrasonically welded, the tab is easy to be broken and easy to be adhered to the welding head. In order to reduce the probability of the tab being broken or adhered to the welding head when the tab and the tab are ultrasonically welded, a welding protection sheet is usually arranged between the welding head and the tab to protect the tab from being broken or adhered to the welding head when the tab and the tab are ultrasonically welded.

[0030] In the prior art, a welding protection sheet is usually arranged for each tab to effectively protect the tab. However, for a battery with a narrow width, due to space limitations, two welding protection sheets cannot be simultaneously accommodated in the width direction of the battery. Therefore, for such a narrow battery, an integrated welding protection sheet is usually used to simultaneously protect two tabs.

[0031] In actual use, although an integrated welding protection sheet is used to simultaneously protect two tabs, the welding of the two tabs and the tab and the protection sheet is carried out separately, that is, one of the tabs is first welded with the tab and the protection sheet, and then the other tab is welded with the tab and the protection sheet.

[0032] However, it is found in actual use that during the welding of one of the tabs, the tab and the protection sheet, the part of the protection sheet connected to the other tab is very easy to be warped or deformed, which causes adverse effects on the welding of the other tab, and the deformation of the protection sheet after welding is very serious.

[0033] Therefore, how to avoid the deformation or warping of the integrated protection sheet is a problem to be solved.

[0034] Based on this, the present application provides a tab welding protection sheet.

[0035] Figure 1A first structural schematic diagram of the tab welding protection sheet 1 of the embodiment of the application is shown, Figure 2 A second structural schematic diagram of the tab welding protection sheet 1 of the embodiment of the application is shown.

[0036] Referring to Figure 1 and Figure 2 As shown, the tab welding protection sheet 1 includes at least two sub-protection sheets 11 arranged along a first direction (i.e. the direction shown by Q in Figure 1 Each sub-protection sheet 11 is used to connect with a tab 21, and adjacent two sub-protection sheets 11 are connected through a connecting part 12, the size of the connecting part 12 in a second direction is smaller than the size of the sub-protection sheet 11 in the second direction and / or the connecting part 12 is a curved surface structure, and the first direction intersects the second direction.

[0037] Specifically, the first direction can be the width direction of the tab welding protection sheet 1, and the second direction can be the length direction of the tab welding protection sheet 1.

[0038] Each sub-protection sheet 11 is used to connect with a tab 21, and in specific implementation, the sub-protection sheet 11 at least covers the welding mark area 211 of the corresponding tab 21, so as to ensure that the sub-protection sheet 11 can play a protection role on the tab 21 during welding.

[0039] Among them, the tab 21 includes a plurality of stacked sub-tabs with the same polarity, and the tab 21 can be a positive tab or a negative tab.

[0040] In the jelly-roll battery cell, the battery cell is formed by stacking a positive plate, a separator, a negative plate, a separator, a positive plate, a separator, a negative plate, and so on, each positive plate includes a positive sub-tab extending outward, each negative plate includes a negative sub-tab extending outward, a plurality of positive sub-tabs are stacked to form a positive tab, and a plurality of negative sub-tabs are stacked to form a negative tab, and the positive tab or the negative tab is the tab 21 connected with the sub-protection sheet 11 in the application.

[0041] In the jelly-roll battery cell, the battery cell is formed by stacking a positive plate, a separator, a negative plate, and so on, each positive plate includes a positive sub-tab extending outward, each negative plate includes a negative sub-tab extending outward, a plurality of positive sub-tabs are stacked to form a positive tab, and a plurality of negative sub-tabs are stacked to form a negative tab, and the positive tab or the negative tab is the tab 21 connected with the sub-protection sheet 11 in the application.

[0042] The two adjacent sub-protection pieces 11 are connected by the connecting part 12, and the sub-protection piece 11 and the connecting part 12 can be formed as an integral structure for actual use. The connecting part 12 is arranged to connect the two sub-protection pieces 11 to form an integral structure for actual use, and to increase the structural strength of the entire tab welding protection piece 1 to avoid tearing the tab welding protection piece 1 during welding.

[0043] The size of the connecting part 12 in the second direction is smaller than the size of the sub-protection piece 11 in the second direction, and / or the connecting part 12 is a curved surface structure, that is, the size of the connecting part 12 in the second direction can be smaller than the size of the sub-protection piece 11 in the second direction, or only a curved surface structure, or both.

[0044] Referring to Figure 2 , the connecting part 12 is a curved surface structure, which means that the cross-sectional shape of the connecting part 12 is at least one of arc, semicircle, triangle and Z shape in the plane perpendicular to the tab welding protection piece 1. Compared with the flat structure, this kind of curved surface structure has better deformability, and when subjected to extrusion or impact caused by welding, this kind of curved surface structure can provide a certain buffering effect by moderate deformation to prevent the welding impact force from reaching the sub-protection piece 11, thereby protecting the two sub-protection pieces 11 from being deformed or warped under the impact of welding.

[0045] In specific implementation, when the welding head is first applied to one of the sub-protection pieces 11, the welding impact force will cause the curved surface structure between the two sub-protection pieces 11 to deform, so that the deformation of the curved surface structure absorbs part of the impact force, so that the impact force hardly reaches the other sub-protection piece 11, thereby protecting the other sub-protection piece 11 from being deformed or warped.

[0046] Referring to Figure 1 , the size of the connecting part 12 in the second direction is smaller than the size of the sub-protection piece 11 in the second direction, that is, the length of the connecting part 12 in the second direction is smaller than the length of the sub-protection piece 11 in the second direction, so that due to the shorter connecting part 12, there must be a part without connection between the two adjacent sub-protection pieces 11, and this part without connection forms a buffer opening 13 between the two sub-protection pieces 11. The existence of the buffer opening 13 provides a certain buffer space for the welding impact force, avoiding the welding impact force from reaching the sub-protection piece 11, thereby protecting the two sub-protection pieces 11 from being deformed or warped under the impact of welding.

[0047] In addition, the existence of the buffer opening 13 can also reduce the weight of the entire welding protection piece, facilitating the actual use of the welding protection piece.

[0048] In addition, the existence of the buffer opening 13 also facilitates the installation and use of the subsequent battery. Exemplarily, the position of the buffer opening 13 corresponds to the position of the liquid injection hole of the battery, so that the existence of the buffer opening 13 enables the welding protection sheet to avoid the liquid injection hole and avoid affecting the liquid injection.

[0049] In the present application, the tab welding protection sheet 1 includes at least two sub-protection sheets 11 arranged along the first direction, and adjacent two sub-protection sheets 11 are connected through a connecting portion 12. The size of the connecting portion 12 in the second direction is smaller than the size of the sub-protection sheet 11 in the second direction, and / or the connecting portion 12 is a curved surface structure. In this way, by limiting the size and / or structure of the connecting portion 12, the connecting portion 12 itself can be a buffer structure or there is a buffer opening 13 between the adjacent two sub-protection sheets 11. The buffer structure or the buffer opening 13 can provide a certain buffer space for the welding impact force, so as to prevent the welding impact force from reaching the sub-protection sheet 11, thereby protecting the two sub-protection sheets 11 from being deformed or warped under the impact of welding.

[0050] Figure 3 A third structural schematic diagram of the tab welding protection sheet 1 of the embodiment of the present application is shown.

[0051] In some embodiments, referring to Figure 1 , Figure 2 and Figure 3 , the connecting portion 12 includes at least one connecting sub-portion 121, and the at least one connecting sub-portion 121 extends or is arranged at intervals along the second direction.

[0052] Specifically, as shown in Figure 1 and Figure 2 , when the connecting portion 12 includes only one connecting sub-portion 121, the connecting sub-portion 121 extends along the second direction. When only one connecting sub-portion 121 is arranged, the weight of the entire tab welding protection sheet 1 can be reduced as much as possible under the premise of ensuring the structural stability, so as to facilitate the actual use.

[0053] As shown in Figure 3 , when the connecting portion 12 includes a plurality (two or more) of connecting sub-portions 121, the plurality of connecting sub-portions 121 are arranged at intervals along the second direction, so that the structural stability of the tab welding protection sheet 1 can be further improved. At the same time, the interval arrangement of the connecting sub-portions 121 enables the buffer opening 13 between adjacent two connecting sub-portions 121, and the existence of the buffer opening 13 can also provide a buffer space for the welding impact force, so as to protect the two sub-protection sheets 11 from being deformed or warped under the impact of welding.

[0054] In some embodiments, continuing to refer to Figure 1 and Figure 3the sum of the sizes of all the connecting sub-sections 121 in the second direction (i.e. Figure 1 L1in the middle, or Figure 3 L2+L3in the middle) to the size of the sub-protection sheet 11 in the second direction (i.e. Figure 1 L in the middle) is 1:10-5:10.

[0055] Specifically, when the ratio of the sum of the sizes of all the connecting sub-sections 121 in the second direction to the size of the sub-protection sheet 11 in the second direction is 1:10-5:10, the total size of all the connecting sub-sections 121 in the second direction is moderate, which can not only ensure the overall strength of the tab welding protection sheet 1, but also play a good buffering role to ensure that the sub-protection sheet 11 will not be deformed or warped.

[0056] When the ratio of the sum of the sizes of all the connecting sub-sections 121 in the second direction to the size of the sub-protection sheet 11 in the second direction is less than 1:10, the total size of all the connecting sub-sections 121 in the second direction is too small to ensure the overall strength of the tab welding protection sheet 1, which is prone to cause the tab welding protection sheet 1 to tear during welding.

[0057] When the ratio of the sum of the sizes of all the connecting sub-sections 121 in the second direction to the size of the sub-protection sheet 11 in the second direction is greater than 5:10, the total size of all the connecting sub-sections 121 in the second direction is too large, so that there is less part between the two sub-protection sheets 11 without connection, that is, the buffering opening 13 formed between the two sub-protection sheets 11 is small, so that the buffering opening 13 cannot provide effective buffering space, and thus cannot effectively buffer the welding impact force, so as to fail to effectively protect the sub-protection sheet 11.

[0058] Exemplarily, the ratio of the sum of the sizes of all the connecting sub-sections 121 in the second direction to the size of the sub-protection sheet 11 in the second direction can be 1:10, 2:10, 3:10, 4:10, 5:10, etc.

[0059] In some embodiments, continuing to refer to Figure 1 shown, the ratio of the size of the connecting sub-section 121 in the first direction (i.e. Figure 1 D1in the middle) to the size of the tab welding protection sheet 1 in the first direction (i.e. Figure 1 D in the middle) is 0.1:10-2:10.

[0060] Specifically, when the ratio of the size of the connecting sub-portion 121 in the first direction to the size of the tab welding protection sheet 1 in the first direction is 0.1:10-2:10, the size of the connecting sub-portion 121 in the first direction is moderate, so that the connecting sub-portion 121 can play a role in enhancing the overall strength of the tab welding protection sheet 1, and will not occupy too much space, ensuring that the setting of the connecting sub-portion 121 will not affect the welding between the two sub-protection sheets 11 and the tab 21 and the adapter sheet 3.

[0061] When the ratio of the size of the connecting sub-portion 121 in the first direction to the size of the tab welding protection sheet 1 in the first direction is less than 0.1:10, the size of the connecting sub-portion 121 in the first direction is too small to ensure the overall strength of the tab welding protection sheet 1, which is prone to cause the tab welding protection sheet 1 to tear during welding.

[0062] When the ratio of the size of the connecting sub-portion 121 in the first direction to the size of the tab welding protection sheet 1 in the first direction is greater than 2:10, the size of the connecting sub-portion 121 in the first direction is too large, and under the condition that the overall size of the tab welding protection sheet 1 is certain, the connecting sub-portion 121 with too large size causes the size of the two sub-protection sheets 11 to be too small, so that the welding tool during welding cannot be placed, thereby causing the welding to be ineffective.

[0063] Exemplarily, the ratio of the size of the connecting sub-portion 121 in the first direction to the size of the tab welding protection sheet 1 in the first direction can be 0.1:10, 0.5:10, 1:10, 1.5:10, 2:10, etc.

[0064] In some embodiments, continuing to refer to Figure 1 and Figure 2 As shown, at least one buffer opening 13 is provided between the two adjacent sub-protection sheets 11, the buffer opening 13 and the connecting sub-portion 121 are arranged alternately in the second direction, and the size of the buffer opening 13 in the first direction is less than or equal to the size of the connecting sub-portion 121 in the first direction.

[0065] Specifically, the provision of the buffer opening 13 provides a certain buffer space for the welding impact force, avoiding the welding impact force reaching the sub-protection sheet 11, thereby protecting the two sub-protection sheets 11 from being deformed or warped under the impact of welding. In addition, the presence of the buffer opening 13 also facilitates the subsequent installation and use of the battery. Exemplarily, the position of the buffer opening 13 corresponds to the position of the liquid injection hole of the battery, so that the presence of the buffer opening 13 enables the welding protection sheet to avoid the liquid injection hole, avoiding affecting the liquid injection.

[0066] The buffer openings 13 and the connecting sub-portions 121 are arranged alternately in the second direction. In the second direction, the arrangement of the connecting sub-portions 121 improves the structural stability of the tab welding protection sheet 1, the arrangement of the buffer openings 13 improves the buffering effect of the tab welding protection sheet 1 on the welding impact force, thereby avoiding the tab welding protection sheet 1 from being warped or deformed, and the alternating arrangement of the buffer openings 13 and the connecting sub-portions 121 enables the tab welding protection sheet 1 to have good structural stability and deformation resistance.

[0067] Figure 4 FIG. 4 shows a fourth structural schematic diagram of the tab welding protection sheet 1 according to an embodiment of the present application, Figure 5 FIG. 5 shows a fifth structural schematic diagram of the tab welding protection sheet 1 according to an embodiment of the present application, Figure 6 FIG. 6 shows a sixth structural schematic diagram of the tab welding protection sheet 1 according to an embodiment of the present application.

[0068] In some embodiments, as shown in FIGS. 1 to 6, Figure 4 、 Figure 5 and Figure 6 two connecting sub-portions 121 are arranged on both sides of the buffer opening 13, and the two connecting sub-portions 121 have different sizes in the second direction.

[0069] Specifically, since the welding area is located in the middle region of the two sub-protection sheets 11 during actual welding, the middle region of the sub-protection sheet 11 may be subjected to a greater welding impact force. Therefore, the buffer opening 13 located in the middle position of the tab welding protection sheet 1 can more effectively absorb and buffer the welding impact force, thereby preventing the other sub-protection sheet 11 from being subjected to a greater welding impact force when one sub-protection sheet 11 is welded, and protecting the sub-protection sheet 11 from being warped or deformed.

[0070] The two connecting sub-portions 121 are arranged on both sides of the buffer opening 13, so as to improve the overall structural strength and stability of the tab welding protection sheet 1.

[0071] The two connecting sub-portions 121 have different sizes in the second direction. In this way, for the entire tab welding protection sheet 1, the different sizes of the connecting sub-portions 121 on both sides facilitate the alignment and installation of the tab welding protection sheet 1 during actual use, thereby preventing mistakes.

[0072] The buffer opening 13 can be a rectangular buffer opening 13 or an elliptical buffer opening 13. For example, Figure 5As shown, when the buffer opening 13 is an elliptical buffer opening 13, the middle region of the buffer opening 13, i.e., the opening size close to the welding region, is larger, which can effectively provide buffering and reduce the warping of the sub-protection sheet 11, while the opening size of the two sides away from the welding region is smaller, which can ensure the strength of the tab welding protection sheet 1 during welding, avoiding the fracture of the tab welding protection sheet 1 caused by ultrasonic welding.

[0073] As shown in Figure 4 and Figure 5 , the connecting sub 121 can be a planar structure. As shown in Figure 6 , the connecting sub 121 can also be an arc-shaped structure. When the connecting sub 121 is an arc-shaped structure, the arc-shaped structure has better deformability, and when subjected to the impact caused by welding, the arc-shaped structure can provide a certain buffering effect through moderate deformation to avoid the welding impact force reaching the sub-protection sheet 11, thereby protecting the two sub-protection sheets 11 from being deformed or warped under the impact of welding. In this way, the arc-shaped structure and the buffer opening 13 act together to buffer the welding impact force, thereby better protecting the sub-protection sheet 11 from being deformed or warped.

[0074] Figure 7 A seventh structure diagram of the tab welding protection sheet 1 of the embodiment of the application is shown.

[0075] In some embodiments, as shown in Figure 7 , the connecting sub 121 is provided with one, and the buffer opening 13 is provided with two, the two buffer openings 13 are respectively located on the two sides of the connecting sub 121, and the sizes of the two buffer openings 13 in the second direction are different.

[0076] Specifically, since the welding region is located in the middle region of the two sub-protection sheets 11 during actual welding, the middle region of the sub-protection sheet 11 may be subjected to a greater welding impact, and therefore the connecting sub 121 located in the middle position of the tab welding protection sheet 1 can better improve the structural strength of the tab welding protection sheet 1 and avoid tearing of the tab welding protection sheet 1 during welding.

[0077] The two buffer openings 13 are respectively located on the two sides of the connecting sub 121 to improve the buffering performance of the tab welding protection sheet 1 and further reduce the weight thereof.

[0078] The sizes of the two buffer openings 13 in the second direction are different, so that for the entire tab welding protection sheet 1, the different sizes of the buffer openings 13 on the two sides facilitate the alignment and installation during actual use, thereby preventing mistakes.

[0079] Figure 8 An eighth structure diagram of the tab welding protection sheet 1 of the embodiment of the application is shown.

[0080] In some embodiments, referring to Figure 8 , the connector portions 121 are provided at least two, and the buffer openings 13 are provided at least two, the connector portions 121 and the buffer openings 13 are staggered.

[0081] Specifically, the connector portions 121 and the buffer openings 13 are staggered, so that in the second direction, the arrangement of the connector portions 121 improves the structural stability of the tab welding protection sheet 1, the arrangement of the buffer openings 13 improves the buffering effect of the tab welding protection sheet 1 on the welding impact force, thereby avoiding the tab welding protection sheet 1 from being warped or deformed, and the alternating arrangement of the buffer openings 13 and the connector portions 121 enables the tab welding protection sheet 1 to have good structural stability and deformation resistance.

[0082] Figure 9 A structural schematic diagram of a battery of an embodiment of the present application is shown.

[0083] Referring to Figure 9 , the present application also provides a battery comprising the tab welding protection sheet 1 of any of the above embodiments, at least two battery cells 2, and a transition sheet 3, each battery cell 2 comprises a tab 21, the tab 21 is located between the transition sheet 3 and the tab welding protection sheet 1, and is connected with the transition sheet 3 and the tab welding protection sheet 1, and each sub-protection sheet 11 of the tab welding protection sheet 1 is connected with a tab 21.

[0084] Specifically, one side of each sub-protection sheet 11 of the tab welding protection sheet 1 is connected with a tab 21, and the sub-protection sheet 11 covers at least the welding mark area 211 of the tab 21, so as to ensure that the welding can be effectively performed.

[0085] In actual welding, the tab welding protection sheet 1, the tab 21, and the transition sheet 3 are sequentially overlapped, then the side of the transition sheet 3 not connected with the tab 21 is placed on the welding table, and the welding head applies pressure to the side of the tab welding protection sheet 1 not connected with the tab 21 for ultrasonic welding, so as to weld the tab welding protection sheet 1, the tab 21, and the transition sheet 3 together, which realizes welding and protects the tab 21 from being damaged and adhered to the welding head.

[0086] In some embodiments, continuing to refer to Figure 9 , the battery further comprises a top cover 4, the top cover 4 is connected with the transition sheet 3, and the ratio of the size of the tab welding protection sheet 1 in the first direction (i.e., D2 shown in 9) to the size of the top cover 4 in the first direction (i.e., D3 shown in 9) is 0.7:1-0.9:1. Figure 9

[0087] ​Specifically, when the ratio of the size of the tab welding protection sheet 1 in the first direction to the size of the top cover 4 in the first direction is 0.7:1~0.9:1, the size of the tab welding protection sheet 1 in the first direction is moderate, which can effectively protect the tab 21 and will not affect the subsequent installation of the top cover 4.

[0088] When the ratio of the size of the tab welding protection sheet 1 in the first direction to the size of the top cover 4 in the first direction is less than 0.7:1, the size of the tab welding protection sheet 1 in the first direction is too small, which is not conducive to the use of the welding tool and cannot effectively protect the tab 21.

[0089] When the ratio of the size of the tab welding protection sheet 1 in the first direction to the size of the top cover 4 in the first direction is greater than 0.9:1, the size of the tab welding protection sheet 1 in the first direction is too large, which is not conducive to the subsequent installation of the top cover 4.

[0090] The tab welding protection sheet 1 and the battery provided by the present application, the tab welding protection sheet 1 comprises at least two sub-protection sheets 11 arranged along the first direction, and the adjacent two sub-protection sheets 11 are connected through a connecting part 12, and the size of the connecting part 12 in the second direction is smaller than the size of the sub-protection sheet 11 in the second direction and / or the connecting part 12 is a curved surface structure, so that by specially limiting the size and / or structure of the connecting part 12, the connecting part 12 itself can be a buffer structure or there is a buffer opening 13 between the adjacent two sub-protection sheets 11, the buffer structure or the buffer opening 13 can provide a certain buffer space for the welding impact force, so as to avoid the welding impact force reaching the sub-protection sheet 11, thereby protecting the two sub-protection sheets 11 from being deformed or warped under the impact of welding.

[0091] It should be understood by those skilled in the art that the above discussion of any of the embodiments is only exemplary and is not intended to imply that the scope (including claims) of the present application is limited to these examples; the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of the different aspects of the present application as described above. In order to be brief, they are not provided in detail.

[0092] The embodiments of the present application are intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tab welding protection sheet, characterized by, The connecting part includes at least one connecting sub-part, and the at least one connecting sub-part extends or is arranged in the second direction.

2. The tab-welding protection sheet according to claim 1, characterized by The ratio of the sum of the sizes of the connecting sub-parts in the second direction to the size of the sub-protection piece in the second direction is 1:10-5:

10.

3. The tab-welding protection sheet according to claim 2, characterized by The ratio of the size of the connecting sub-part in the first direction to the size of the tab welding protection piece in the first direction is 0.1:10-2:

10.

4. The tab-welding protection sheet according to claim 2, characterized by At least one buffer opening is arranged between the two adjacent sub-protection pieces, the buffer opening and the connecting sub-part are arranged alternately in the second direction, and the size of the buffer opening in the first direction is less than or equal to the size of the connecting sub-part in the first direction.

5. The tab-welding protection sheet according to claim 2, characterized by The connecting sub-part is provided with two, the buffer opening is provided with one, and the two connecting sub-parts are respectively located on both sides of the buffer opening.

6. The tab-welding protection sheet according to claim 5, characterized by The connecting sub-part is provided with one, and the buffer opening is provided with two, and the two buffer openings are respectively located on both sides of the connecting sub-part.

7. The tab-welding protection sheet according to claim 5, characterized by The connecting sub-part is provided with at least two, and the buffer opening is provided with at least two, and the connecting sub-part and the buffer opening are staggered.

8. The tab-welding protection sheet according to claim 5, characterized by In the plane perpendicular to the tab welding protection piece, the cross-sectional shape of the connecting part is at least one of arc, semicircle, triangle and Z shape.

9. The tab-welding protection sheet according to claim 1, characterized by The connecting part includes at least one connecting sub-part, and the at least one connecting sub-part extends or is arranged in the second direction.

10. A battery, characterized by The ratio of the size of the connecting sub-part in the first direction to the size of the tab welding protection piece in the first direction is 0.1:10-2:

10.

11. The battery of claim 10, wherein, At least one buffer opening is arranged between the two adjacent sub-protection pieces, the buffer opening and the connecting sub-part are arranged alternately in the second direction, and the size of the buffer opening in the first direction is less than or equal to the size of the connecting sub-part in the first direction. The connecting sub-part is provided with two, the buffer opening is provided with one, and the two connecting sub-parts are respectively located on both sides of the buffer opening. The connecting sub-part is provided with one, and the buffer opening is provided with two, and the two buffer openings are respectively located on both sides of the connecting sub-part. The connecting sub-part is provided with at least two, and the buffer opening is provided with at least two, and the connecting sub-part and the buffer opening are staggered. In the plane perpendicular to the tab welding protection piece, the cross-sectional shape of the connecting part is at least one of arc, semicircle, triangle and Z shape. The connecting part includes at least one connecting sub-part, and the at least one connecting sub-part extends or is arranged in the second direction. The ratio of the size of the connecting sub-part in the first direction to the size of the tab welding protection piece in the first direction is 0.1:10-2:

10. At least one buffer opening is arranged between the two adjacent sub-protection pieces, the buffer opening and the connecting sub-part are arranged alternately in the second direction, and the size of the buffer opening in the first direction is less than or equal to the size of the connecting sub-part in the first direction. The connecting sub-part is provided with two, the buffer opening is provided with one, and the two connecting sub-parts are respectively located on both sides of the buffer opening. The connecting sub-part is provided with one, and the buffer opening is provided with two, and the two buffer openings are respectively located on both sides of the connecting sub-part. The connecting sub-part is provided with at least two, and the buffer opening is provided with at least two, and the connecting sub-part and the buffer opening are staggered. In the plane perpendicular to the tab welding protection piece, the cross-sectional shape of the connecting part is at least one of arc, semicircle, triangle and Z shape.

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