Tab and battery

Abstract

This utility model relates to the field of battery technology, providing a connecting piece and a battery. The connecting piece includes: a terminal post connecting portion and a tab connecting portion; the terminal post connecting portion is adapted to connect with the terminal post of the battery, the terminal post connecting portion has a support platform, the support surface of the support platform abuts against the terminal post, the side of the terminal post connecting portion away from the support surface is pressed against the electrode assembly and insulated from the electrode assembly, the terminal post connecting portion is supported between the electrode assembly and the terminal post; the tab connecting portion is adapted to connect with the tab of the battery, along the length direction of the electrode assembly, the tab connecting portion is connected to the first end of the terminal post connecting portion; the first end of the terminal post connecting portion is disposed away from the outer side of the electrode assembly compared to the second end of the terminal post connecting portion. The connecting piece provided by this utility model can support the electrode assembly at the end when the battery is inverted, thereby increasing the contact area between the top cover assembly and the electrode assembly, ensuring the spacing between the electrode assembly and the top cover assembly, ensuring good maintenance of the tab shape, and ensuring battery safety when the battery thermal runaway temperature rises.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a connecting piece and a battery. Background Technology

[0002] In traditional square lithium batteries, the tabs of multiple electrode groups are welded to multiple connecting pieces, which are then welded to the terminals of the top cover. An insulating film is then wrapped around the outside of the electrode groups, and the battery is installed to seal them.

[0003] To improve battery pack energy density, the need for inverted battery installation was proposed during battery layout optimization. When the battery is inverted, the internal electrode assembly absorbs electrolyte and experiences significant gravity, which is even greater under vibration conditions. Currently, besides the central support of the electrode assembly in the top cover, the supports on both sides of the top cover are weak. The electrode assembly is prone to tilting and stress, leading to misalignment of internal electrode plates and short circuits. Simultaneously, the contact area between the top cover and the electrode assembly is too small, resulting in excessive localized pressure. Under vibration conditions, the top cover is prone to cracking and damage, failing to support the electrode assembly. This inability to limit the electrode assembly's movement causes it to buckle and pull, leading to internal short circuits and ultimately affecting the safety of the battery cells. Utility Model Content

[0004] This invention provides a connecting piece and a battery to solve the problem in the prior art where the electrolyte in the inverted cell increases the weight of the electrode assembly, and the top cover cannot effectively support the electrode assembly, which easily leads to battery failure.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, the present invention provides a connecting piece, comprising: a terminal connecting portion adapted to be connected to the terminal of the battery, the terminal connecting portion having a support platform, the support surface of the support platform abutting against the terminal, the side of the terminal connecting portion away from the support surface pressing against the electrode group and being insulatedly connected to the electrode group, and the terminal connecting portion being supported between the electrode group and the terminal.

[0007] A tab connection portion is adapted to be connected to the tab of the battery, and along the length direction of the electrode group, the tab connection portion is connected to the first end of the terminal connection portion;

[0008] Along the length of the electrode group, the first end of the electrode post connection portion is positioned away from the outer side of the electrode group compared to the second end of the electrode post connection portion.

[0009] According to the present invention, the support platform is a groove, and the groove is a square groove.

[0010] According to the connecting piece provided by this utility model, the groove opening of the square groove is arranged facing the pole group;

[0011] Alternatively, the groove opening of the square groove is oriented towards the pole group, and the groove opening has an opening along the length of the pole group, the opening being located at the first end of the pole post connection.

[0012] According to the connecting piece provided by this utility model, the distance between the side of the pole connecting part and the groove wall of the square groove is w, and w satisfies: 0.5mm≤w≤50mm.

[0013] According to the connecting piece provided by this utility model, along the height direction of the electrode group, the thickness of the electrode tab connecting part is h, where h satisfies: 0.5mm≤h≤5mm;

[0014] The height of the support platform is h1, and h1 satisfies: 2mm≤h1≤10mm.

[0015] According to the connecting piece provided by this utility model, the ratio of the height of the support platform to the thickness of the electrode connecting part is within the range of: 0.2≤h1 / h≤5.

[0016] According to the present invention, a connecting piece is provided in which, along the length direction of the electrode assembly, the first end of the electrode post connecting part is bent and connected to the electrode lug connecting part to form a bent part, and a groove is formed between the first end of the electrode post connecting part and the bent part on the side away from the electrode assembly. The groove includes a first sidewall and a second sidewall, the first sidewall being disposed near the support platform and the second sidewall being disposed near the bent part.

[0017] The distance between the first sidewall and the second sidewall is w2, and w2 satisfies: w2≥1mm.

[0018] According to the connecting piece provided by this utility model, along the length and width directions of the pole group, the distance between the pole post connecting part and the first insulating member protruding from both ends of the top cover assembly is E, where E satisfies: 0.3mm≤E≤20mm.

[0019] Secondly, this utility model provides a battery, including: an electrode assembly, a casing, a top cover assembly, an insulating sheet, and a connecting piece as described above;

[0020] The pole group is located inside the housing, and the top cover assembly is fixed to the opening end of the housing;

[0021] The connecting piece is connected to the pole post of the top cover assembly and the pole lug of the pole group respectively, and the insulating piece is sandwiched between the pole post connecting part and the pole group.

[0022] According to the present invention, the insulating sheet has an insulating layer, a first adhesive layer and a second adhesive layer.

[0023] The insulating layer is sandwiched between the first adhesive layer and the second adhesive layer, with the first adhesive layer facing the electrode connection portion and the second adhesive layer facing the electrode assembly.

[0024] And / or, the thickness of the insulating sheet is h3, where h3 satisfies: 0.03mm≤h3≤20mm;

[0025] And / or, the insulating sheet pressed onto the periphery of the pole connection has an arc-shaped chamfer, the radius of the arc-shaped chamfer is R, and R satisfies: 0.5mm≤R≤20mm.

[0026] The connecting piece and battery provided by this utility model, by setting a support platform at the terminal connection part and having the support surface of the support platform abut against the terminal post, and pressing the side of the terminal connection part away from the support surface onto the electrode assembly and insulatingly connecting it to the electrode assembly, allows the connecting piece to connect the electrode lugs and the terminal post of the electrode assembly respectively, while the terminal connection part can also support the electrode assembly. When the battery is inverted and the weight of the electrode assembly is large, the terminal connection part can support the electrode assembly at the end of the electrode assembly, serving as a strong supplement to the support provided by the top cover assembly in the middle of the electrode assembly. This provides good support for the electrode assembly, increasing the contact area between the top cover assembly and the electrode assembly, dispersing the local pressure of the top cover assembly, and ensuring the spacing between the electrode assembly and the top cover assembly, thus ensuring the good maintenance of the lug shape. Furthermore, when the battery thermal runaway temperature rises and the insulation of the top cover assembly softens, the terminal connection part is not affected by the temperature rise and still provides stable support for the electrode assembly, ensuring the unobstructed venting channel of the explosion-proof valve and ensuring the safety of the battery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is an exploded view of a battery using existing technology.

[0029] Figure 2 This is a three-dimensional structural diagram of a battery using existing technology.

[0030] Figure 3 This is a top view of the connecting piece provided by this utility model.

[0031] Figure 4 This utility model provides Figure 3 AA sectional view.

[0032] Figure 5This is a three-dimensional structural diagram of the first connecting piece provided by this utility model.

[0033] Figure 6 This is a three-dimensional structural diagram of the second type of connecting piece provided by this utility model.

[0034] Figure 7 This is an exploded view of the battery provided by this utility model.

[0035] Figure 8 This is a top view of the battery provided by this utility model.

[0036] Figure 9 This utility model provides Figure 8 BB cross-sectional view.

[0037] Figure 10 This is one of the schematic diagrams of the battery assembly provided by this utility model.

[0038] Figure 11 This is the second schematic diagram of the battery assembly provided by this utility model.

[0039] Figure label:

[0040] 1. Connecting piece; 11. Pole post connecting part; 12. Pole lug connecting part; 13. Bending part; 111. Support platform; 112. Groove part; 1111. Support surface; 1121. First side wall; 1122. Second side wall;

[0041] 2. Electrode group; 21. Electrode ear;

[0042] 3. Shell;

[0043] 4. Top cover assembly; 41. First insulating component; 42. Cover body; 43. Terminal post; 44. Second insulating component;

[0044] 5. Insulating sheet;

[0045] 100. Standard connecting piece. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0049] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] The following is combined with Figures 1 to 11The connecting piece and battery provided in this utility model embodiment will be described in detail through specific embodiments and application scenarios.

[0052] Firstly, such as Figure 3 and Figure 4 As shown, this embodiment provides a connecting piece 1, including: a pole connecting part 11 and a pole tab connecting part 12.

[0053] The terminal connection 11 is adapted to be connected to the terminal 43 of the battery. The terminal connection 11 has a support platform 111. The support surface 1111 of the support platform 111 abuts against the terminal 43. The side of the terminal connection 11 away from the support surface 1111 is pressed against the electrode group 2 and is insulated from the electrode group 2. The terminal connection 11 is supported between the electrode group 2 and the terminal 43.

[0054] The tab connection portion 12 is adapted to be connected to the tab 21 of the battery. Along the length direction of the electrode group 2, the tab connection portion 12 is connected to the first end of the terminal connection portion 11.

[0055] Along the length of the pole group 2, the first end of the pole post connecting part 11 is disposed away from the outer side of the pole group 2 compared to the second end of the pole post connecting part 11.

[0056] Understandably, in existing technologies, traditional square lithium-ion batteries typically employ a scheme of two electrode groups 2 and two connecting pieces 1. The two electrode groups 2 are arranged side by side, and the tabs 21 of the two electrode groups 2 are welded to the two connecting pieces 1 respectively. The connecting pieces 1 are then welded to the base plate of the terminal post 43 of the top cover assembly 4.

[0057] like Figure 1 and Figure 2 As shown, the battery top cover assembly 4 includes a cover body 42, a first insulating member 41, a second insulating member 44, and a terminal post 43. Both the first insulating member 41 and the second insulating member 44 are located on the side of the cover body 42 facing the electrode group 2. The terminal post 43 passes through a through hole in the cover body 42. The first insulating member 41 protrudes from both ends of the cover body 42, and the second insulating member 44 has an outward protrusion in the middle of the cover body 42, which abuts against the middle of the electrode group 2. An explosion-proof valve is provided on the cover body 42 corresponding to the outward protrusion, and an exhaust channel is provided on the outward protrusion for the explosion-proof valve to exhaust air. The top cover assembly 4 covers the housing 3, encapsulating the two electrode groups 2 within the housing.

[0058] When the battery is inverted, rotated 180°, the two electrode groups 2 are positioned on top of the top cover assembly 4. The top cover assembly 4 only contacts the two electrode groups 2 through its central protrusion. Gaps exist between the bent portions of the conventional connecting piece 100 and between the conventional connecting piece 100 and the electrode groups 2. This results in a small contact area between the top cover assembly 4 and the electrode groups 2 after assembly, and gaps remain between them. Consequently, the top cover assembly 4 cannot adequately support the electrode groups 2, making them prone to wobbling.

[0059] like Figure 1 As shown, the conventional connecting piece 100 in the prior art has a relatively small height. After the conventional connecting piece 100 is connected to the pole post 43 and the pole lug 21 respectively, the upper side of the conventional connecting piece 100 is connected to the pole post 43, and there is a gap between the lower side and the pole group 2.

[0060] The connecting piece 1 in this embodiment includes a pole post connecting portion 11 and a tab connecting portion 12. Since the tab 21 is closer to the inner side of the pole post 43 along the length direction of the pole group 2, the tab connecting portion 12 is located inside the pole post connecting portion 11. A support platform 111 is provided on the pole post connecting portion 11, and the support platform 111 extends the height of the connecting piece 1 along the height direction of the pole group 2. The support surface 1111 of the support platform 111 abuts against the pole post 43, and the other side of the pole post connecting portion 11 is insulated from the pole group 2. In the area between the pole post 43 and the pole group 2, the support platform 111 provides good support for the pole post 43 and the pole group 2. In addition to the support position of the pole group 2 in the middle of the top cover assembly 4, the connecting piece 1 in this embodiment also provides support for the pole group 2 on both sides. The connecting piece 1 increases the contact area between the top cover assembly 4 and the pole group 2, and also disperses the pressure on the pole group 2 in the length direction, avoiding excessive pressure on the middle of the pole group 2. Especially under vibration conditions, the contact between the connecting piece 1 and the pole group 2 and the pole post 43 can limit the pole group 2, prevent the pole group 2 from being pulled and jumping, and ensure the normal use of the second insulating part 44 of the top cover assembly 4.

[0061] Furthermore, because the pressure of the protruding portion of the second insulating member 44 in the middle region of the electrode assembly 2 is dispersed, the shape of the gap area between the electrode assembly 2 and the top cover assembly 4 is well maintained, preventing the electrode assembly 2 from further compressing and bending the tab 21 when the support is poor, thus ensuring the reliable stability of the tab 21's shape. Moreover, when the battery thermal runaway temperature rises above 120°C, the second insulating member 44 of the top cover assembly 4 softens, weakening its supporting effect on the electrode assembly 2. The connecting piece 1 can then support the electrode assembly 2 and the top cover assembly 4 from both ends, avoiding the safety risk caused by blockage of the explosion-proof valve's exhaust channel.

[0062] In one example, this embodiment has two terminals 43 on the top cover assembly 4, namely a positive terminal and a negative terminal, which are respectively located at both ends of the top cover assembly 4. Two connecting pieces 1 are provided at both ends of the electrode group 2, one corresponding to the positive terminal and the other to the negative terminal. The terminal connection portion 11 of the two connecting pieces 1 faces outwards from the electrode group 2, and the tab connection portion 12 faces inwards from the electrode group 2.

[0063] Optionally, the support platform 111 can be a solid platform or a thin-walled structure formed by stamping. The support surface 1111 can be square, circular, or polygonal. In this embodiment, the base plate of the pole post 43 has a square structure, and the support surface 1111 of the support platform 111 is also set to be square to maximize the electrical connection with the pole post 43.

[0064] Since a direct connection between pole group 2 and pole post connection 11 would cause a short circuit, the contact between pole post connection 11 and pole group 2 needs to be insulated. Specifically, a gasket, coating, or insulating film can be used to achieve an insulated connection between pole post connection 11 and pole group 2.

[0065] The connecting piece 1 provided by this utility model has a support platform 111 provided in the electrode connection part 11, and the support surface 1111 of the support platform 111 abuts against the electrode 43. The side of the electrode connection part 11 away from the support surface 1111 is pressed against the electrode group 2 and insulated from the electrode group 2. This allows the connecting piece 1 to connect the electrode tab 21 of the electrode group 2 and the electrode 43 respectively, while the electrode connection part 11 can also support the electrode group 2. When the battery is inverted and the weight of the electrode group 2 is large, the electrode connection part 11 can support the end of the electrode group 2. As a top cover assembly 4, The middle part of the electrode assembly 2 provides strong support, which not only increases the contact area between the top cover assembly 4 and the electrode assembly 2 and disperses the local pressure on the top cover assembly 4, but also ensures the spacing between the electrode assembly 2 and the top cover assembly 4, ensuring the good maintenance of the shape of the tab 21. Furthermore, when the battery thermal runaway temperature rises and the second insulating part 44 of the top cover assembly 4 softens, the electrode post connection part 11 is not affected by the temperature rise and still provides stable support for the electrode assembly 2, ensuring the unobstructed exhaust channel of the explosion-proof valve and ensuring the safety of the battery.

[0066] like Figure 3 As shown, the support platform 111 in this embodiment is a groove, and the groove is a square groove.

[0067] Understandably, in this embodiment, the support platform 111 is a groove that protrudes from the pole post connection 11 toward the pole group 2 to form a support surface 1111. The hollow design of the support platform 111 can reduce the weight of the connecting piece 1. Furthermore, in order to form a square support surface 1111, the groove in this embodiment is a square slot. Square slots can be processed by stamping, which is easy to process and efficient.

[0068] like Figure 5 As shown, the opening end of the square groove in this embodiment is oriented towards the pole group 2.

[0069] It is understood that the square groove in this embodiment is located inside the pole post connecting part 11, that is, the pole post connecting part 11 has an edge on the periphery of the support platform 111.

[0070] like Figure 6 As shown, the groove opening of the square groove faces the pole group 2. Along the length direction of the pole group 2, the groove opening has an opening located at the first end of the pole post connector 11 away from the pole tab connector 12.

[0071] It is understandable that, along the length of the pole group 2, the square groove in this embodiment extends through the side of the pole post connecting part 11, that is, the pole post connecting part 11 does not have an edge in the area of ​​the support platform 111 near the outer side of the pole group 2.

[0072] like Figure 3 As shown, in this embodiment, the distance between the side of the pole connection 11 and the wall of the square groove is w, and w satisfies: 0.5mm≤w≤50mm.

[0073] Understandably, the distance between the side of the pole post connector 11 and the wall of the square groove can be either along the length of the pole group 2 or along the width of the pole group 2. The range of W needs to be within a certain range to ensure both the stamping process and that the pole post connector 11 will not be deformed under pressure.

[0074] Specifically, the distance w between the side of the pole connector 11 and the wall of the square groove can be 0.5mm, 27.5mm, or 50.5mm.

[0075] like Figure 4 As shown, in this embodiment, the thickness of the tab connection portion 12 along the height direction of the electrode group 2 is h, and h satisfies: 0.5mm≤h≤5mm.

[0076] The height of the support platform 111 is h1, and h1 satisfies: 2mm≤h1≤10mm.

[0077] Understandably, the thickness h of the tab connection 12 refers to the height between the two sides of the tab connection 12. h needs to be set within a suitable range to meet the support strength requirements while controlling the weight and material usage. The height h1 of the support platform 111 refers to the height between the support surface 1111 and the side of the pole connection 11 facing the support surface 1111. h1 needs to be set within a suitable range to ensure that there is sufficient clearance between the pole group 2 and the top cover assembly 4 to form an exhaust channel for the explosion-proof valve, while also saving internal battery space as much as possible to avoid waste.

[0078] Specifically, the thickness h of the tab connection 12 can be 0.5mm, 2.75mm, or 5mm. The height h1 of the support platform 111 can be 2mm, 6mm, or 10mm.

[0079] like Figure 4 As shown, the ratio of the height of the support platform 111 to the thickness of the tab connection portion 12 in this embodiment satisfies the following range: 0.2≤h1 / h≤5.

[0080] Understandably, for the support platform 111 formed by the stamping process, the ratio h1 / h of the height of the support platform 111 to the thickness of the tab connection 12 needs to be set within a suitable range. It is necessary to form a support platform 111 with a certain height for support, and it is also necessary to ensure that the support platform 111 is stamped and has a certain structural strength within the height range that the stamping process can achieve.

[0081] Specifically, the ratio of the height of the support platform 111 to the thickness of the tab connection 12 can be 0.2, 2.6, or 5.

[0082] like Figure 4 As shown, along the length of the pole assembly 2, the first end of the pole post connecting part 11 is bent and connected to the pole ear connecting part 12 to form a bent part 13, and a groove part 112 is formed between the first end of the pole post connecting part 11 and the bent part 13 on the side away from the pole assembly 2. The groove part 112 includes a first side wall 1121 and a second side wall 1122. The first side wall 1121 is disposed near the support platform 111, and the second side wall 1122 is disposed near the bent part 13.

[0083] The distance between the first sidewall 1121 and the second sidewall 1122 is w2, and w2 satisfies: w2≥1mm.

[0084] Understandably, the pole post connector 11 and the tab connector 12 are bent to form a bend 13, so that the pole post connector 11 and the tab connector 12 are not at the same height. The tab connector 12 is closer to the top cover assembly 4. The bend creates more connection space for the tab connector 12 to connect with the tab 21. The tab connector 12 presses against the tab 21 from the side closer to the top cover assembly 4, providing more clearance for the height of the tab 21 and ensuring the reliability of the connection between the tab connector 12 and the tab 21.

[0085] Optionally, the bent portion 13 of the tab connector 12 and the pole connector 11 can be connected by a smooth arc transition.

[0086] Since the first end of the pole post connector 11 is adjacent to the support platform 111 and the bending portion 13, the support platform 111 and the bending portion 13 form a groove 112 on the side of the pole post connector 11 away from the pole group 2. The connection between the groove 112 and the support platform 111 forms a first sidewall 1121, and the connection between the groove 112 and the bending portion 13 forms a second sidewall 1122. The distance w2 between the first sidewall 1121 and the second sidewall 1122 must meet certain distance requirements so that the appropriate conforming punch can perform stamping processing.

[0087] Specifically, the distance w2 between the first sidewall 1121 and the second sidewall 1122 can be 1mm, 2mm, or 3mm, as long as it satisfies the connection between the pole post connector 11 and the pole tab connector 12.

[0088] like Figure 11 As shown, along the length and width directions of the pole group 2, the distance between the pole post connecting part 11 and the first insulating member 41 protruding from the top cover assembly 4 in this embodiment is E, and E satisfies: 0.3mm≤E≤20mm.

[0089] Understandably, the top cover assembly 4 has first insulating members 41 at both ends, which surround the periphery of the pole post connection portion 11. The distance E between the pole post connection portion 11 and the top cover assembly 4 surrounding the pole post connection portion 11 can be either the distance between the pole post connection portion 11 and the first insulating member 41 in the length direction of the pole group 2 or the distance in the width direction of the pole group 2. E needs to meet a certain range to ensure that the pole post connection portion 11 can be installed into the installation space formed by the first insulating member 41, and to maximize the area of ​​the support surface 1111 of the support platform 111 to form effective support for the pole post 43.

[0090] Specifically, the distance E between the pole post connector 11 and the top cover assembly 4 surrounding the pole post connector 11 can be 0.3 mm, 10.15 mm, or 20 mm.

[0091] Secondly, such as Figure 7 As shown, this embodiment provides a battery, including: an electrode assembly 2, a housing 3, a top cover assembly 4, an insulating sheet 5, and a connecting piece 1 as described above.

[0092] The pole group 2 is located inside the housing 3, and the top cover assembly 4 is fixed to the open end of the housing 3; the connecting piece 1 is connected to the pole post 43 of the top cover assembly 4 and the pole lug 21 of the pole group 2 respectively, and the insulating piece 5 is sandwiched between the pole post connecting part 11 and the pole group 2.

[0093] Specifically, since the battery includes a connecting piece 1, and the specific structure of the connecting piece 1 is as described in the above embodiments, the battery shown in this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects achieved by all the technical solutions of the above embodiments, which will not be described in detail here.

[0094] Understandably, in this embodiment, an insulating sheet 5 is provided between the contact surfaces of the terminal connection 11 and the electrode assembly 2 to prevent short circuits caused by contact between the connecting piece 1 and the electrode assembly 2. Furthermore, the insulating sheet 5 also protects the electrode assembly 2, preventing metal slag generated during welding of the support platform 111 and the base plate of the terminal 43 from falling into the battery and causing a short circuit. The insulating sheet 5 is made of insulating material and needs to be resistant to electrolyte.

[0095] Specifically, the insulating sheet 5 can be made of materials such as PP, PET, PE, MPP, ABS, or fluororubber.

[0096] like Figure 10 and Figure 11 As shown, in practical applications, the electrode group 2 and the top cover assembly 4 are first placed on the same plane, with the two electrode groups 2 located on opposite sides of the top cover assembly 4. Next, the electrode tabs 21 of the electrode group 2 are welded to the electrode tab connecting portion 12. Then, the support platform 111 of the electrode post connecting portion 11 is assembled and welded to the base plate of the electrode post 43, and an insulating sheet 5 is applied between the electrode group 2 and the electrode post connecting portion 11. Finally, the electrode group 2 is assembled and installed into the housing 3 to complete the encapsulation of the electrode group 2.

[0097] In this embodiment, the battery provides a support platform 111 on the connecting piece 1 to provide polarity support for the electrode group 2 at the end of the electrode group 2. This increases the support surface area 1111 between the electrode group 2 and the top cover assembly 4, ensuring stable support for the electrode group 2, ensuring smooth exhaust passage of the explosion-proof valve, and protecting the normal state of the tab 21.

[0098] The insulating sheet 5 in this embodiment has an insulating layer, a first adhesive layer, and a second adhesive layer.

[0099] An insulating layer is sandwiched between a first adhesive layer and a second adhesive layer. The first adhesive layer is disposed facing the electrode connection portion 11, and the second adhesive layer is disposed facing the electrode assembly 2.

[0100] Understandably, in this embodiment, the insulating sheet 5 is connected to the electrode assembly 2 and the electrode post connection portion 11 via adhesive backing. The first adhesive backing layer is used to bond the electrode post connection portion 11 and the insulating layer, and the second adhesive backing layer is used to bond the electrode assembly 2 and the insulating layer. In this embodiment, the first and second adhesive backing layers can firmly connect the insulating layer to the electrode post connection portion 11 and the electrode assembly 2.

[0101] Both the first and second adhesive layers need to be resistant to electrolytes. Specifically, the first and second adhesive layers can be acrylic pressure-sensitive adhesives.

[0102] like Figure 8 and Figure 9 As shown, the thickness of the insulating sheet 5 in this embodiment is h3, and h3 satisfies: 0.03mm≤h3≤20mm.

[0103] Understandably, the thickness h3 of the insulating sheet 5 refers to the height between the two sides of the insulating sheet 5. h3 needs to meet a certain range so that it can not be broken down under voltage and has a stable insulation effect, but it cannot take up too much battery space and cause waste.

[0104] Specifically, the thickness h3 of the insulating sheet 5 can be 0.03mm, 10.015mm, or 20mm.

[0105] like Figure 11 As shown, in this embodiment, the insulating sheet 5 is pressed onto the periphery of the pole connection portion 11 and has an arc-shaped chamfer. The radius of the arc-shaped chamfer is R, and R satisfies: 0.5mm≤R≤20mm.

[0106] Understandably, the radius R of the chamfer needs to meet a certain range. It is necessary to ensure that the corner of the insulating sheet 5 is smoothly transitioned after the chamfer and will not pierce the pole group 2, and that the insulating sheet 5 can still cover the pole group 2 so that the pole post connection part 11 can effectively support the pole group 2.

[0107] Specifically, the radius R of the curved chamfer can be 0.5mm, 10.25mm, or 20mm.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A connecting piece, used in a battery, characterized in that, include: A terminal connection portion is adapted to be connected to the terminal of the battery. The terminal connection portion has a support platform. The support surface of the support platform abuts against the terminal. The side of the terminal connection portion away from the support surface is pressed against the electrode group and is insulated from the electrode group. The terminal connection portion is supported between the electrode group and the terminal. A tab connection portion is adapted to be connected to the tab of the battery, and along the length direction of the electrode group, the tab connection portion is connected to the first end of the terminal connection portion; Along the length of the electrode group, the first end of the electrode post connection portion is positioned away from the outer side of the electrode group compared to the second end of the electrode post connection portion.

2. The connecting piece according to claim 1, characterized in that, The support platform is a groove, and the groove is a square groove.

3. The connecting piece according to claim 2, characterized in that, The opening end of the square groove is oriented towards the pole group; Alternatively, the groove opening of the square groove is oriented towards the pole group, and the groove opening has an opening along the length of the pole group, the opening being located at the first end of the pole post connection.

4. The connecting piece according to claim 3, characterized in that, The distance between the side of the pole connector and the wall of the square groove is w, where w satisfies: 0.5mm≤w≤50mm.

5. The connecting piece according to claim 1, characterized in that, Along the height direction of the electrode group, the thickness of the electrode tab connection is h, where h satisfies: 0.5mm≤h≤5mm; The height of the support platform is h1, and h1 satisfies: 2mm≤h1≤10mm.

6. The connecting piece according to claim 5, characterized in that, The ratio of the height of the support platform to the thickness of the electrode connection part is within the range of: 0.2≤h1 / h≤5.

7. The connecting piece according to claim 1, characterized in that, Along the length of the electrode assembly, the first end of the electrode post connecting part is bent and connected to the electrode lug connecting part to form a bent part, and a groove is formed between the first end of the electrode post connecting part and the bent part on the side away from the electrode assembly. The groove includes a first sidewall and a second sidewall. The first sidewall is disposed near the support platform, and the second sidewall is disposed near the bent part. The distance between the first sidewall and the second sidewall is w2, and w2 satisfies: w2≥1mm.

8. The connecting piece according to claim 1, characterized in that, Along the length and width directions of the electrode group, the distance between the electrode post connection and the first insulating member protruding from both ends of the top cover assembly is E, where E satisfies: 0.3mm≤E≤20mm.

9. A battery, characterized in that, include: The electrode assembly, housing, top cover assembly, insulating sheet, and connecting piece as described in any one of claims 1 to 8; The pole group is located inside the housing, and the top cover assembly is fixed to the opening end of the housing; The connecting piece is connected to the pole post of the top cover assembly and the pole lug of the pole group respectively, and the insulating piece is sandwiched between the pole post connecting part and the pole group.

10. The battery according to claim 9, characterized in that, The insulating sheet has an insulating layer, a first adhesive layer, and a second adhesive layer; The insulating layer is sandwiched between the first adhesive layer and the second adhesive layer, with the first adhesive layer facing the electrode connection portion and the second adhesive layer facing the electrode assembly. And / or, the thickness of the insulating sheet is h3, where h3 satisfies: 0.03mm≤h3≤20mm; And / or, the insulating sheet pressed onto the periphery of the pole connection has an arc-shaped chamfer, the radius of the arc-shaped chamfer is R, and R satisfies: 0.5mm≤R≤20mm.

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