A battery cell and a battery

Abstract

The utility model provides a battery cell and a battery, wherein a battery cell comprises: a battery cell body, a tab assembly and protective adhesive tape, the tab assembly comprises a transfer tab and a lead-out tab, the transfer tab is connected to the battery cell body, and the transfer tab extends from the first side of the battery cell body to the outside of the battery cell body, the transfer tab forms a first angle θ, the lead-out tab is fixedly connected to one end of the transfer tab relative to the battery cell body, and the connection position of the lead-out tab and the transfer tab forms a welding portion; the protective adhesive tape covers the welding portion, and the protective adhesive tape is connected to the battery cell body, and the first angle θ is less than 90°. The present application is used to solve the technical problem that the battery in a multi-tab battery cell is too thick, which easily causes abnormal appearance after packaging, and ensures that the appearance of the battery after packaging is flat.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a battery core and a battery. Background Art

[0002] Lithium polymer batteries, also known as polymer lithium batteries, are also a type of lithium-ion batteries. They have the advantages of high energy density, long cycle life, strong temperature adaptability, etc. They are stable and reliable, and the battery thickness can be very thin. Therefore, they are widely used in electronic equipment and electric vehicles.

[0003] In a multi-electrode battery cell structure, it is necessary to connect hard pole ears to the multi-layer soft pole ears. The common process is to bend the hard pole ears and the soft pole ears respectively. In the width direction of the battery, the hard pole ears and the soft pole ears are prone to overlap. The bent connection section of the hard pole ears occupies a certain space in the thickness direction of the battery cell. When the thickness of the battery cell is small, the bent connection section of the hard pole ears will exceed the battery cell body, resulting in abnormal appearance after packaging.

[0004] Therefore, there is an urgent need to solve the technical problem that the arrangement of the tabs in multi-tab battery cells affects the battery thickness and easily causes abnormal appearance after packaging. Utility Model Content

[0005] The utility model provides an electric core and a battery, which are used to solve the technical problem that the battery in the electric core with multiple pole ears is too thick and easily causes abnormal appearance after packaging, and ensure that the appearance of the battery after packaging is flat.

[0006] In order to achieve the above object, the utility model provides a battery cell, comprising:

[0007] Battery cell body;

[0008] A tab assembly, wherein the tab assembly comprises a transfer tab and a lead-out tab, wherein the transfer tab is connected to the cell body and extends from a first side of the cell body to the outside of the cell body, wherein the transfer tab forms a first angle θ, wherein the lead-out tab is fixedly connected to one end of the transfer tab relative to the cell body, and a welding portion is formed at a connection position between the lead-out tab and the transfer tab;

[0009] Protective tape, the protective tape covers the welding portion, and the protective tape is connected to the battery cell body, and the first angle θ is less than 90°.

[0010] The utility model provides a battery cell, which improves the bending posture of the pole ear assembly and the protective tape, the protective tape covers the welding part, and is connected to the battery cell body, and the protective tape plays a role in fixing and restraining the posture of the adapter pole ear, so that the first angle θ formed by the adapter pole ear is less than 90°, so that a section where the lead-out pole ear and the adapter pole ear are connected is inclined, reducing the space occupied by the lead-out pole ear in the thickness direction of the battery, thereby solving the problem that the section where the lead-out pole ear and the adapter pole ear are connected easily causes the battery to be over-thick, ensuring the smooth appearance of the battery after packaging, and solving the problem that the appearance of the battery cell is abnormal after packaging or the sealing is damaged due to the wear of the aluminum-plastic film.

[0011] In a possible implementation, the protective tape includes:

[0012] A first protective tape, the first protective tape comprising a protective portion and connecting portions connected to both sides of the protective portion along a first direction, the protective portion at least covering a side of the welding portion facing away from the battery cell body, the connecting portion extending to the side of the welding portion and connected to the battery cell body; and / or,

[0013] A second protective adhesive tape at least covers a side of the welding portion facing the battery cell body.

[0014] In a possible implementation, the lead-out tab forms an opening with a second angle Φ facing away from the battery cell body.

[0015] In a possible implementation, along the first direction, a width V1 of the first protective tape and a width V2 of the second protective tape satisfy 1.2≤V1 / V2≤1.5; and / or,

[0016] Along the length direction of the tab assembly, the length L1 of the first protective tape and the length L2 of the second protective tape satisfy 0≤L1-L2≤3mm.

[0017] In a possible implementation, the battery cell body includes a plurality of first pole sheets and a plurality of second pole sheets that are stacked or stacked and then wound, wherein the first pole sheets and the second pole sheets are separated from each other by a diaphragm, and the diaphragm has an extended section extending to the first side of the battery cell body;

[0018] The connecting portion is connected to the extending section, or,

[0019] The connecting portion is connected to the first pole piece or the second pole piece.

[0020] In a possible implementation, the position where the connecting portion is connected to the extending section forms a connecting area;

[0021] The area S of the connection region is 3 mm2≤S≤15 mm2; and / or,

[0022] Along the length direction of the tab assembly, the length A of the connection area satisfies 1mm≤A≤2mm.

[0023] In a possible implementation, there are two tab assemblies, and the two tab assemblies are arranged at intervals along the first direction;

[0024] Along the first direction, the minimum spacing V3 between the connecting portions of the two tab assemblies satisfies V3 ≥ 6 mm; and / or,

[0025] Along the first direction, a maximum distance V4 between the connecting portions of the two electrode tab assemblies and a width V5 of the first pole piece or the second pole piece satisfy 0.7≤V4 / V5≤0.9.

[0026] In a possible implementation, the transfer tab includes a first section and a second section connected to each other, and the first angle θ is formed between the first section and the second section;

[0027] The lead-out tab includes a third section and a fourth section that are connected to each other. The third section is fixedly connected to the second section. The second angle Φ is formed between the third section and the fourth section.

[0028] In a possible implementation, the first angle θ satisfies: 30°≤θ≤60°.

[0029] The utility model also provides a battery, which comprises a shell and the above-mentioned battery core, wherein a receiving cavity is formed in the shell, the battery core is arranged in the receiving cavity, and part of the lead-out tabs extend to the outside of the shell.

[0030] The utility model provides a cell and a battery. By controlling the size of a first angle θ, the spacing T between the first side of the cell body and the first inner wall can be reduced, that is, the energy density occupied by the head top sealing space is reduced, so that the battery can be reduced in thickness while taking into account the energy density.

[0031] In addition to the technical problems solved by the embodiments of the utility model described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by a battery cell and a battery provided by the embodiments of the utility model, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the structure of an existing battery cell;

[0034] Figure 2 A schematic diagram of the structure of a battery body of a battery provided in an embodiment of the utility model;

[0035] Figure 3 A schematic diagram of the connection structure between the battery body and the tab assembly of the battery provided in an embodiment of the utility model;

[0036] Figure 4 A schematic diagram of the structure of a battery cell provided in an embodiment of the utility model;

[0037] Figure 5 A schematic diagram of the structure of a first protective adhesive tape for a battery cell provided in an embodiment of the utility model;

[0038] Figure 6 Another schematic diagram of the structure of the first protective tape of the battery cell provided by the embodiment of the utility model;

[0039] Figure 7 Another schematic diagram of the structure of the first protective tape of the battery cell provided by the embodiment of the utility model;

[0040] Figure 8 A top view of a battery cell provided in an embodiment of the utility model;

[0041] Fig. 9 A schematic structural diagram of a battery cell provided by an embodiment of the utility model from the perspective of a first side of the battery cell body;

[0042] Fig.10 A schematic structural diagram of another battery cell provided by an embodiment of the utility model from the perspective of a first side of the battery cell body;

[0043] Fig.11 A cross-sectional view of a battery provided in an embodiment of the utility model.

[0044] Description of reference numerals:

[0045] 10-battery cell body;

[0046] 11- first pole piece;

[0047] 12- second pole piece;

[0048] 13- diaphragm;

[0049] 131- extension section;

[0050] 14-Connection area;

[0051] 15- soft ear;

[0052] 16-hard pole ear;

[0053] 20- adapter tab;

[0054] 21- first paragraph;

[0055] 22-Second paragraph;

[0056] 30-lead out the pole ear;

[0057] 31- third paragraph;

[0058] 32-4th paragraph;

[0059] 40-Protective tape;

[0060] 41- first protective tape;

[0061] 42- second protective tape;

[0062] 411-Protection Department;

[0063] 412-connection part;

[0064] 50- welding part;

[0065] 60-housing;

[0066] 61-accommodating chamber;

[0067] 62-First inner wall. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0069] refer to Figure 1 As shown, the multi-electrode structure needs to connect the hard pole ear 16 to the multi-layer soft pole ear 15. The common process is to bend the hard pole ear 16 and the soft pole ear 15 once respectively, but this process will cause the hard pole ear 16 to overlap with the soft pole ear 15 in the width direction of the battery cell. Figure 1 The direction indicated by the arrow X in the figure makes the lower limit of the battery cell thickness limited by the height of the bent connecting section 161 of the hard pole ear 16. When being compatible with thinner battery cells, a great loss of energy density is required. Without losing a great deal of energy density, currently only battery cells with a thickness of more than 3.5 mm can be compatible.

[0070] Conventional folding ear method, reference Figure 1 The dotted line in the figure shows the posture before packaging. Figure 1 The solid line in the figure shows the posture after packaging. The hard pole ear 16 is welded on the soft pole ear 15, and the solder joint protection glue is pasted, and then it is folded directly in the original position. The bent connecting section 161 of the hard pole ear 16 needs to occupy a certain space in the thickness direction of the battery cell. The thickness direction of the battery cell is referenced Figure 1 In the direction indicated by the arrow Z in FIG. 1 , when the thickness of the battery cell is small, the bent connecting section 161 of the hard pole ear 16 will extend beyond the battery cell body, resulting in abnormal appearance after packaging or wear of the aluminum-plastic film, thereby damaging the sealing performance.

[0071] refer to Figure 3 As shown, in the present application, after the transfer welding, the transfer tab 20 and the lead-out tab 30 are welded and connected, and the bent transfer tab 20 is bonded to the diaphragm 13 by means of protective tape, so that the transfer tab 20 is kept in an acute angle state. In this state, the bent connection section of the lead-out tab 30 is in an inclined state, so the height it occupies is the smallest; at the same time, the material of the transfer tab 20 is relatively soft and easy to loosen, and the shrinkage of the aluminum-plastic film shell after formation will also affect the angle of the transfer tab 20 after entering the shell. After affixing the protective tape, the position of the transfer tab 20 is also fixed, which can reduce the abnormal appearance problem caused by the sliding of the bending point; and through size control, the head space of the battery can be reduced, thereby improving the energy density of the battery.

[0072] The present application solves the problem of limited applicability of thickness dimensions caused by the folding ear process, and is compatible with battery cells with a thickness of less than 1 mm. While manufacturing a multi-ear battery cell structure, it can also reduce the energy density occupied by the head top edge sealing space, so that the battery can be reduced in thickness while taking into account the energy density.

[0073] The following describes the battery cell and battery provided by the embodiments of the present utility model with reference to the accompanying drawings.

[0074] refer to Figure 2 and Figure 3As shown, the utility model provides a battery cell, comprising: a battery cell body 10, a tab assembly and a protective tape 40, the tab assembly comprising a transfer tab 20 and a lead-out tab 30, the transfer tab 20 is connected to the battery cell body 10, and the transfer tab 20 extends from a first side of the battery cell body 10 to the outside of the battery cell body 10, the transfer tab 20 forms a first angle θ, the lead-out tab 30 is fixedly connected to one end of the transfer tab 20 relative to the battery cell body 10, and the connection position of the lead-out tab 30 and the transfer tab 20 forms a welding portion 50; the protective tape 40 covers the welding portion 50, and the protective tape 40 is connected to the battery cell body 10, and the first angle θ is less than 90°.

[0075] The utility model provides a battery cell, which improves the bending posture of the pole ear assembly and the protective tape 40. The protective tape 40 covers the welding part 50 and is connected to the battery cell body 10. The protective tape 40 fixes and constrains the posture of the adapter pole ear 20, so that the first angle θ formed by the adapter pole ear 20 is less than 90°, so that a section where the lead-out pole ear 30 is connected to the adapter pole ear 20 is inclined, reducing the space occupied by the lead-out pole ear 30 in the thickness direction of the battery, thereby solving the problem that the section where the lead-out pole ear 30 is connected to the adapter pole ear 20 easily causes the battery to be too thick, ensuring the smooth appearance of the battery after packaging, and solving the problem that the appearance of the battery cell is abnormal after packaging or the aluminum-plastic film is worn and the sealing is damaged.

[0076] The opening of the transfer tab 20 forming a first angle θ faces the cell body 10 , and the protective tape 40 is connected to the cell body 10 to fix the transfer tab 20 , so that the first angle θ is less than 90°.

[0077] In a possible implementation, the lead tab 30 may be fixedly connected to the end of the adapter tab 20 opposite to the cell body 10 by welding. The welding portion 50 is a weld mark formed by welding the lead tab 30 and the adapter tab 20.

[0078] The utility model provides a battery cell, wherein the first angle θ is less than 90°, that is, the first angle θ is an acute angle, and when the battery cell is compatible with thinner ones, the energy density of the battery cell can be improved.

[0079] When the electrode is a negative electrode, the transfer tab 20 can be made of copper foil, and the lead tab 30 can be made of copper-plated nickel. The strength of the lead tab 30 is greater than that of the transfer tab 20. When the electrode is a positive electrode, the transfer tab 20 is made of aluminum foil, and the lead tab 30 can be made of aluminum foil.

[0080] In one possible implementation, reference Figure 3 , Figure 4 and Figure 5As shown, the protective tape 40 includes: a first protective tape 41, the first protective tape 41 includes a protective portion 411 and a connecting portion 412 connected on both sides of the protective portion 411 along a first direction, the protective portion 411 at least covers the side of the welding portion 50 facing away from the battery cell body 10, and the connecting portion 412 extends to the side of the welding portion 50 and is connected to the battery cell body 10.

[0081] In one possible implementation, reference Figure 3 , Figure 4 and Figure 5 As shown, the protective tape 40 includes a second protective tape 42 , and the second protective tape 42 at least covers a side of the welding portion 50 facing the battery cell body 10 .

[0082] In this example, the first direction reference Figure 5 The first direction is the length direction of the battery cell, and the first direction is the direction indicated by the arrow Y in FIG.

[0083] It is easy to understand that the first protective tape 41 and the second protective tape 42 cover the two sides of the welding part 50 respectively, which can avoid the problem of short circuit of the battery cell caused by the burrs of the welding part 50, and play an insulating protection effect. In addition, the first protective tape 41 includes a protective part 411 and a connecting part 412 connected to both sides of the protective part 411 along the first direction. The connecting part 412 extends to the side of the welding part 50 and is connected to the battery body 10. The connection between the connecting part 412 and the battery body 10 is used to fix the position of the welding part 50, thereby constraining the position of the lead-out tab 30, which helps to reduce the space occupied by the lead-out tab 30 in the thickness direction of the battery.

[0084] In a possible implementation, the first protective tape 41 and the second protective tape 42 may be high temperature resistant and burr-proof tapes, including but not limited to PI tape, PTFE tape, PET tape, UV tape, and the like.

[0085] In one possible implementation, reference Figure 5 , Figure 6 and Figure 7 As shown, in the length direction of the tab assembly, that is, the direction indicated by the arrow Z, the connecting portion 412 may extend from the top end of the protective portion 411 , or may extend from the top end and the bottom end of the protective portion 411 .

[0086] In one possible implementation, reference Figure 3 As shown, the lead-out tab 30 includes a second angle Φ formed with the opening facing away from the battery cell body 10 .

[0087] In one possible implementation, reference Figure 8As shown, along the first direction, the width V1 of the first protective tape 41 and the width V2 of the second protective tape 42 satisfy 1.2≤V1 / V2≤1.5; so that the width V1 of the first protective tape 41 is greater than the width V2 of the second protective tape 42.

[0088] In one possible implementation, V1 / V2 may be, for example, 1.2, 1.3, 1.4 or 1.5.

[0089] Along the length direction of the tab assembly, the length L1 of the first protective tape 41 and the length L2 of the second protective tape 42 satisfy 0≤L1-L2≤3mm.

[0090] In one possible implementation, the battery cell body 10 includes a plurality of first pole sheets 11 and a plurality of second pole sheets 12 that are stacked or stacked and then wound, the first pole sheets 11 and the second pole sheets 12 are separated from each other by a diaphragm 13, the diaphragm 13 has an extension section 131 extending to the first side of the battery cell body 10, and the end of the extension section 131 away from the battery cell body 10 lacks support, so the extension section 131 presents a downward sloping shape.

[0091] There are two types of connection positions between the first protective tape 41 and the cell body 10: the first type is that the connection portion 412 is connected to the extension section 131, and the connection portion 412 is connected to the extension section 131 of the diaphragm 13, so that the extension section 131 of the diaphragm 13 can bear part of the weight of the transfer tab 20 and part of the lead-out tab 30, which helps to make the first angle θ < 90°. The second type is that the connection portion 412 is connected to the first pole piece 11 or the second pole piece 12, so that the cell body 10 can bear part of the weight of the transfer tab 20 and part of the lead-out tab 30, and can also prevent the first angle θ from being deformed too much, which helps to make the first angle θ < 90°.

[0092] In a possible implementation, the connection portion 412 at least covers a portion of the heat-affected zone of the diaphragm 13 .

[0093] In a possible implementation, the first pole pieces 11 are all positive pole pieces, and the second pole pieces 12 are all negative pole pieces. Each first pole piece 11 and each second pole piece 12 is respectively connected to a corresponding transfer tab 20, wherein the transfer tab 20 correspondingly connected to the first pole piece 11 is a positive transfer tab, and the transfer tab 20 correspondingly connected to the second pole piece 12 is a negative transfer tab.

[0094] In one possible implementation, reference Fig. 9 and Fig.10As shown, the position where the connecting portion 412 is connected to the extending section 131 forms a connecting area 14; the area S of the connecting area 14 is 3㎜2≤S≤15㎜2, which can not only ensure the connection strength between the connecting portion 412 and the extending section 131, but also reduce the consumption of the first protective tape 41, avoiding excessive increase in production costs.

[0095] In one possible implementation, the area S of the connection region 14 may be, for example, 3 mm2, 5 mm2, 7 mm2, 8 mm2, 10 mm2, 12 mm2, 14 mm2 or 15 mm2.

[0096] In a possible implementation, along the length direction of the tab assembly, the length A of the connection area 14 satisfies 1mm≤A≤2mm. If the length A of the connection area 14 is too short, it will affect the stability of the connection between the connection portion 412 and the extension section 131, and the connection portion 412 may be easily loosened from the extension section 131 due to the pulling action of the transfer tab 20 and the lead tab 30; if the length A of the connection area 14 is too long, it will cause excessive consumption of the first protective tape 41, resulting in excessive cost increase. The present application can take into account the stability of the connection between the connection portion 412 and the extension section 131, and can also avoid the problem of excessive increase in production costs.

[0097] In a possible implementation, there are two pole lug assemblies, which are spaced apart along the first direction; the two pole lug assemblies are respectively connected to the first pole piece 11 and the second pole piece 12 to form a positive pole lug and a negative pole lug, respectively.

[0098] In a possible implementation, along the first direction, the minimum spacing V3 between the connection portions 412 of the two tab assemblies satisfies V3 ≥ 6 mm, thereby preventing the connection portions 412 of the two tab assemblies from overlapping and affecting the thickness of the battery.

[0099] In a possible implementation, the minimum spacing V3 between the connection portions 412 of the tab assemblies may be 6 mm, 7 mm, 8 mm, 8.5 mm, or 10 mm.

[0100] In one possible implementation, reference Figure 8 As shown, along the first direction, the maximum spacing V4 between the connection parts 412 of the two tab assemblies and the width V5 of the first pole piece 11 or the second pole piece 12 satisfy 0.7≤V4 / V5≤0.9, ensuring a certain spacing between the connection part 412 and the edge of the second pole piece 12.

[0101] In one possible implementation, V4 / V5 may be, for example, 0.7, 0.75, 0.8, 0.86, or 0.9.

[0102] In one possible implementation, reference Figure 3As shown, the transfer tab 20 includes a first section 21 and a second section 22 connected to each other, and a first angle θ is formed between the first section 21 and the second section 22 , wherein 30°≤θ≤60°.

[0103] In one possible implementation, the first angle θ can be, for example, 30°, 35°, 40°, 45° or 60°. If θ is too small, it will be difficult to process; conversely, if θ is too large, the improvement effect on the flatness of the battery appearance will not be obvious, and the lead ear 30 will easily protrude from the battery shell 60.

[0104] In one possible implementation, reference Figure 3 As shown, the lead-out tab 30 includes a third section 31 and a fourth section 32 connected to each other, the third section 31 is fixedly connected to the second section 22, and a second angle Φ is formed between the third section 31 and the fourth section 32; the thickness of the battery cell body 10 is H, and the length of the tab assembly between the first section 21 and the fourth section 32 is L3, wherein L3=H / sinθ, 0<H<3mm.

[0105] In the present application, the thickness H of the battery cell body 10 satisfies 0<H<3mm, so that the battery cell body 10 is an ultra-thin battery cell.

[0106] refer to Fig.11 As shown, the utility model further provides a battery, which includes a shell 60 and the above-mentioned battery cell. A receiving cavity 61 is formed in the shell 60, and the battery cell is arranged in the receiving cavity 61. Part of the lead-out tab 30 extends to the outside of the shell 60.

[0107] In a possible implementation, the housing 60 has a first inner wall 62 facing the first side of the cell body 10 of the cell, and a distance T between the first side of the cell body 10 and the first inner wall 62 satisfies: T=H / tanθ.

[0108] During production, the lead-out pole ear 30 is bent once to form a second angle Φ, wherein 90°≤Φ≤135°, and then the transfer pole ear 20 is bent, specifically, the transfer pole ear 20 is folded upward to form an initial angle of 90°~150°, and then the transfer pole ear 20 is bonded to the extended section 131 of the diaphragm 13 through the connecting portion 412 of the first protective tape 41, so that the posture of the transfer pole ear 20 is fixed, and the initial angle of 90°~150° formed by the upward folding of the transfer pole ear 20 is reduced to an acute angle state, that is, the first angle θ<90° is maintained, and after positioning and preheat sealing, the battery cell is placed in the accommodating cavity 61 of the shell 60. In this example, the shell 60 is an aluminum-plastic film shell, and the top wall of the shell 60 and the bottom wall of the shell 60 in the top sealing area of ​​the battery cell are attached to the connecting portion 412 of the first protective tape 41 for preheat sealing to achieve top sealing and obtain the final state.

[0109] The utility model provides a cell and a battery. When the thickness H of the cell body 10 is determined, the first angle θ is controlled to satisfy: 30°≤θ≤60°, so that the spacing T between the first side of the cell body 10 and the first inner wall 62 can be reduced, that is, the energy density occupied by the head top edge sealing space is reduced, so that the battery can reduce the thickness while taking into account the energy density.

[0110] In the description of the present invention, it should be understood that the terms used, such as “center”, “length”, “width”, “thickness”, “top”, “bottom”, “up”, “down”, “left”, “right”, “front”, “back”, “vertical”, “horizontal”, “inside”, “outside”, “axial”, “circumferential”, etc., to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the position or component referred to must have a specific direction, a specific structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0111] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0112] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or can communicate with each other; they can be directly connected, or indirectly connected through an intermediate medium, so that the internal communication of two elements or the interaction relationship between two elements can be achieved. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0113] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery cell, characterized in that: include: A battery cell body (10); A tab assembly, the tab assembly comprising a transfer tab (20) and a lead-out tab (30), the transfer tab (20) being connected to the battery cell body (10), and the transfer tab (20) extending from a first side of the battery cell body (10) to the outside of the battery cell body (10), the transfer tab (20) forming a first angle θ, the lead-out tab (30) being fixedly connected to one end of the transfer tab (20) relative to the battery cell body (10), and a welding portion (50) being formed at a connection position between the lead-out tab (30) and the transfer tab (20); A protective adhesive tape (40), the protective adhesive tape (40) covers the welding portion (50), and the protective adhesive tape (40) is connected to the battery cell body (10), and the first angle θ is less than 90°.

2. The battery cell according to claim 1, characterized in that: The protective adhesive tape (40) comprises: a first protective adhesive tape (41), the first protective adhesive tape (41) comprising a protective portion (411) and connecting portions (412) connected to both sides of the protective portion (411) along a first direction, the protective portion (411) at least covering a side of the welding portion (50) facing away from the battery cell body (10), the connecting portion (412) extending to the side of the welding portion (50) and connected to the battery cell body (10); and / or, A second protective adhesive tape (42), wherein the second protective adhesive tape (42) at least covers a side of the welding portion (50) facing the battery cell body (10).

3. The battery cell according to claim 1, characterized in that: The lead-out tab (30) forms an opening at a second angle Φ facing away from the battery cell body (10).

4. The battery cell according to claim 2, characterized in that: Along the first direction, the width V1 of the first protective tape (41) and the width V2 of the second protective tape (42) satisfy 1.2≤V1 / V2≤1.5; and / or, Along the length direction of the tab assembly, the length L1 of the first protective adhesive tape (41) and the length L2 of the second protective adhesive tape (42) satisfy the condition 0≤L1-L2≤3mm.

5. The battery cell according to claim 2, characterized in that: The battery cell body (10) comprises a plurality of first pole sheets (11) and a plurality of second pole sheets (12) which are stacked or stacked and then wound, wherein the first pole sheets (11) and the second pole sheets (12) are separated from each other by a diaphragm (13), and the diaphragm (13) has a protruding section (131) extending to a first side of the battery cell body (10); The connecting portion (412) is connected to the extending section (131), or, The connecting portion (412) is connected to the first pole piece (11) or the second pole piece (12).

6. The battery cell according to claim 5, characterized in that: The position where the connecting portion (412) is connected to the extending section (131) forms a connecting area (14); The area S of the connection area (14) is 3 mm 2 ≤S≤15㎜ 2 and / or, Along the length direction of the tab assembly, the length A of the connection area (14) satisfies 1 mm ≤ A ≤ 2 mm.

7. The battery cell according to claim 5, characterized in that: There are two pole lug assemblies, and the two pole lug assemblies are arranged at intervals along the first direction; Along the first direction, a minimum spacing V3 between the connecting portions (412) of the two tab assemblies satisfies V3 ≥ 6 mm; and / or, Along the first direction, a maximum spacing V4 between the connecting portions (412) of the two pole tab assemblies and a width V5 of the first pole piece (11) or the second pole piece (12) satisfy 0.7≤V4 / V5≤0.

9.

8. The battery cell according to claim 3, characterized in that: The transition tab (20) comprises a first section (21) and a second section (22) connected to each other, and the first angle θ is formed between the first section (21) and the second section (22); The lead-out tab (30) comprises a third section (31) and a fourth section (32) connected to each other, the third section (31) is fixedly connected to the second section (22), and the second angle Φ is formed between the third section (31) and the fourth section (32).

9. The battery cell according to claim 1, characterized in that: The first angle θ satisfies: 30°≤θ≤60°.

10. A battery, characterized in that: The battery comprises a shell (60) and a battery cell according to any one of claims 1 to 9, wherein a receiving cavity (61) is formed in the shell (60), the battery cell is arranged in the receiving cavity (61), and part of the lead-out tab (30) extends to the outside of the shell (60).

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