Battery

Abstract

The invention provides a battery. The battery comprises a shell, a cover body, a battery cell, a pole assembly and an insulating glue layer, the cover body is buckled on the shell; the battery cell is located in a cavity defined by the shell and the cover body, and a first tab of the battery cell is conductively connected with the shell; a pole assembly arranged on the shell in a penetrating manner is connected with a second tab of the battery cell; the pole assembly comprises a connecting sheet and a pole; the insulating rubber layer is arranged between the connecting sheet and the side wall of the shell; a first hole is formed in the side wall of the shell, a second hole is formed in the insulating glue layer, the pole penetrates through the overlapping area of the first hole and the second hole, at least part of the connecting piece is exposed in the overlapping area of the first hole and the second hole, and the connecting piece exposed in the overlapping area is connected with the second tab through a first welding mark. The projection of the first welding mark does not coincide with the projection of the pole. Through the mode, compared with a riveting mode, the welding connection mode is low in cost, and the problem of poor air tightness or short circuit of the battery caused by riveting can be avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0002] With the rapid development of battery technology, batteries are used in more and more scenarios, especially in metal-packaged batteries (steel shell batteries or aluminum shell batteries, etc.). The poles with opposite polarity to the shell in metal-packaged batteries are usually processed by riveting structures, but the process of this setting is relatively complicated and costly, and deviations in dimensional matching during riveting may cause poor airtightness or short circuit problems in metal-packaged batteries. Summary of the invention

[0003] In view of this, the present application provides a battery to solve the problem of complex and high cost of battery pole processing, as well as the problem of poor battery airtightness or short circuit.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A battery comprising:

[0006] A shell and a cover body buckled on the shell;

[0007] A battery cell is located in a cavity enclosed by the shell and the cover, and a first electrode tab of the battery cell is conductively connected to the shell;

[0008] A pole assembly is provided on the housing and connected to the second pole lug of the battery cell, wherein the pole assembly comprises a connecting piece and a pole;

[0009] An insulating rubber layer, disposed between the connecting piece and the side wall of the housing;

[0010] A first hole is formed on the side wall of the shell, a second hole is formed on the insulating rubber layer, the pole passes through the first hole and the second hole, at least a part of the connecting piece is exposed in the overlapping area of ​​the first hole and the second hole, and the connecting piece exposed in the overlapping area of ​​the first hole and the second hole is connected to the second pole ear through a first weld mark; and in the width direction of the shell, the projection of the first weld mark and the projection of the pole do not overlap.

[0011] Optional, including:

[0012] Pole lead-out piece;

[0013] An insulating layer, disposed between the pole lead-out piece and the side wall of the shell;

[0014] The pole lead-out piece and the insulating layer are both provided with avoidance holes for avoiding the pole, the pole lead-out piece is connected to the pole, and the pole lead-out piece covers the first weld mark, or the first weld mark is exposed in the avoidance hole.

[0015] Optional, including:

[0016] Pole lead-out piece;

[0017] An insulating layer, disposed between the pole lead-out piece and the side wall of the shell;

[0018] The pole is formed on the pole lead-out piece, and the pole extends inward from the outer side of the shell and is connected to the connecting piece.

[0019] Optionally, at least one of the first hole, the second hole, the opening of the pole lead-out plate and the opening of the insulating layer is a waist-shaped hole; and a ratio of the length to the width of the waist-shaped hole is greater than or equal to 1.5.

[0020] Optional,

[0021] In the protruding direction of the pole, the contour of the connecting piece overlaps with the side wall, and the width of the overlapping position is D, where D satisfies: D ≥ 0.5 mm; and / or,

[0022] The battery further includes a reinforcing sheet located outside the shell, and the first electrode tab, the shell and the reinforcing sheet are welded together.

[0023] Optionally, a nickel-plated layer is provided on a side of the side wall close to the insulating adhesive layer, and a thickness of the nickel-plated layer is L, wherein L satisfies: 0.5 μm≤L≤3 μm.

[0024] Optionally, a non-linear groove portion is provided on the cover body and is on a plane perpendicular to the cover body.

[0025] Optional,

[0026] The groove portion is located at the edge area of ​​the cover body; and / or,

[0027] The depth of the groove portion is greater than half the thickness of the cover body; and / or,

[0028] The shape of the groove portion is a curve, an S-shape, a circle, or an arc.

[0029] Optionally, it includes an insulating sheet arranged between the body of the battery cell and the pole ear of the battery cell, and the insulating sheet is provided with an avoidance groove for avoiding the pole ear.

[0030] Optionally, the side wall is connected to the first pole tab of the battery cell via a second weld mark, and a cross-sectional dimension of the second weld mark tapers from the side wall toward the first pole tab.

[0031] Optionally, the cover body is connected to the side wall of the shell by a third weld, and the outline of the cover body exceeds the side wall by a dimension H, wherein H satisfies: H≤0.3 mm.

[0032] Optionally, the shell includes a protrusion, and the pole assembly is located in the protrusion.

[0033] The battery provided by the present application is provided with a first hole in the side wall of the shell, a second hole in the insulating rubber layer, and the pole passes through the first hole and the second hole. In this way, when the connecting piece is insulated and connected to the side wall of the shell through the insulating rubber layer, at least part of the connecting piece will be exposed in the overlap area, and then the connecting piece exposed in the overlap area of ​​the first hole and the second hole will be connected to the second pole ear through the first welding mark, and in the width direction of the shell, the projection of the first welding mark and the projection of the pole do not overlap. In this way, the connection of the pole assembly and the second pole ear can be achieved by welding. Compared with the riveting connection method, the welding connection method is simpler and has a lower cost, and can avoid the problem of poor air tightness or short circuit of the battery caused by dimensional deviation during riveting. Moreover, the projection of the first welding mark and the projection of the pole do not overlap, thereby preventing the welding of the pole ear and the connecting piece and the pole from affecting each other in the length direction of the battery cell, ensuring that the two do not interfere with each other. At the same time, it means that the welding of the pole ear and the connecting piece and the position of the pole are arranged along the width direction, making full use of the space in the width direction of the battery cell, avoiding occupying the space in the length direction of the battery, and effectively improving the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application 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 only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 An exploded view of a battery provided in an embodiment of the present application;

[0036] Figure 2 A transverse cross-sectional view of a battery with an insulating layer and a terminal lead-out plate provided with avoidance holes;

[0037] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0038] Figure 4 In one implementation method, the lower insulating layer and the pole lead-out piece are provided with an explosion avoidance hole Figure 1 ;

[0039] Figure 5 In one implementation method, the lower insulating layer and the pole lead-out piece are provided with an explosion avoidance hole Figure 2 ;

[0040] Figure 6 An exploded view of another implementation method in which the lower insulating layer and the pole lead-out sheet are provided with avoidance holes;

[0041] Figure 7 It is a schematic diagram of the structure of the pole assembly;

[0042] Figure 8 It is a schematic diagram of the structure of the insulating sheet;

[0043] Fig. 9 A side view of a battery with an insulating layer and a terminal lead-out plate provided with an avoidance hole;

[0044] Fig.10 A transverse cross-sectional view of a battery with an insulating layer and a terminal lead-out plate provided with avoidance holes;

[0045] Fig.11 for Fig.10 Enlarged view of point B.

[0046] exist Figure 1-Figure 11 middle:

[0047] 1-shell, 2-cover, 3-cell, 4-pole assembly, 5-insulating rubber layer, 6-first hole, 7-second hole, 8-pole lead sheet, 9-insulating layer, 10-avoidance hole, 11-insulating sheet, 12-grooved portion, 13-first weld mark, 14-second weld mark;

[0048] 101 - side wall, 301 - first pole ear, 302 - second pole ear, 401 - connecting piece, 402 - pole column, 1101 - avoidance groove. DETAILED DESCRIPTION

[0049] The present application provides a battery.

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] like Figures 1 to 11As shown, the present application provides a battery, which may be a metal-packaged battery. Metal-packaged batteries are a common packaging method for lithium-ion batteries. Common metal-packaged batteries include steel shell batteries, aluminum shell batteries, and the like. The battery mainly includes a shell 1, a cover 2, a battery cell 3, a pole assembly 4, and an insulating rubber layer 5. Among them, the cover 2 is buckled on the shell 1, and the cover 2 and the shell 1 together form a receiving cavity for accommodating components such as the battery cell 3; the battery cell 3 is located in the cavity enclosed by the shell 1 and the cover 2. Usually, the battery cell 3 is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a diaphragm disposed between the positive electrode sheet and the negative electrode sheet, that is, the battery cell 3 can be either a wound battery cell or a laminated battery cell, and the first pole ear 301 of the battery cell 3 is conductively connected to the shell 1, that is, the shell 1 has the same polarity as the first pole ear 301; the pole assembly 4 is passed through the shell, and the pole assembly 4 is connected to the second pole ear 302 of the battery cell 3, and the pole Component 4 includes a connecting piece 401 and a pole 402, wherein the connecting piece 401 is used to connect to the second pole ear 302, and the pole 402 protrudes from the shell 1 to lead the polarity of the second pole ear 302 to the outside of the shell 1; the insulating rubber layer 5 is arranged between the connecting piece 401 and the side wall 101 of the shell 1 to achieve an insulating connection between the connecting piece 401 and the side wall 101 of the shell 1. Since the shell 1 has the same polarity as the first pole ear 301, and the connecting piece 401 has the same polarity as the second pole ear 302, the insulating rubber layer 5 is arranged to avoid short circuit between the first pole ear 301 and the second pole ear 302.

[0052] Among them, the side wall 101 of the shell 1 is provided with a first hole 6, the insulating rubber layer 5 is provided with a second hole 7, and the overlapping area of ​​the first hole 6 and the second hole 7 is larger than the cross-sectional size of the pole 402. The pole 402 passes through the first hole 6 and the second hole 7, and at least part of the connecting piece 401 is exposed in the overlapping area of ​​the first hole 6 and the second hole 7. The connecting piece 401 exposed in the overlapping area of ​​the first hole 6 and the second hole 7 is connected to the second pole ear 302 through the first weld mark 13, and in the width direction of the shell 1, the projection of the first weld mark 13 and the projection of the pole 402 do not overlap.

[0053] Specifically, during the process of assembling the battery, the insulating rubber layer 5 is set on the side wall 101 of the shell 1, the battery cell 3 and the pole assembly 4 are placed inside the shell 1, one side of the connecting piece 401 is abutted against the second pole ear 302 of the battery cell 3 and the other side is bonded to the insulating rubber layer 5, the pole 402 passes through the overlapping area of ​​the first hole 6 and the second hole 7 and protrudes from the side of the shell 1. Since the overlapping area of ​​the first hole 6 and the second hole 7 is larger than the cross-sectional size of the pole 402, when the pole 402 passes through the overlapping area, at least a part of the connecting piece 401 will be exposed in the overlapping area of ​​the first hole 6 and the second hole 7, and since the connecting piece 401 and the second pole ear 302 are abutted, the connecting piece 401 and the second pole ear 302 exposed in the overlapping area are welded together by welding, so as to facilitate the welding of the pole assembly 4 and the connecting piece 401. Furthermore, since the welding position is exposed in the overlapping area, whether there is a welding leak can be determined by checking whether the appearance of the first weld mark 13 after welding is complete, thereby ensuring that the connecting piece 401 and the second electrode tab 302 can be welded together.

[0054] It should be noted that the polarities of the first pole ear 301 and the second pole ear 302 are not limited here. For example, the first pole ear 301 can be a negative pole ear, and the corresponding second pole ear 302 is a positive pole ear. In this case, the polarity of the shell 1 is the same as the polarity of the negative pole ear; of course, the first pole ear 301 can also be a positive pole ear, and the corresponding second pole ear 302 is a negative pole ear. In this case, the polarity of the shell 1 is the same as the polarity of the positive pole ear.

[0055] It should also be noted that the formation method of the first weld mark 13 is not limited here, and the first weld mark 13 can be formed by laser welding, resistance welding, cold metal transition welding, stir friction welding, etc.

[0056] It should also be noted that the connection relationship between the connecting piece 401 and the pole 402 is not limited here. The connecting piece 401 and the pole 402 can be an integral structure, or a separate structure connected by welding or the like.

[0057] For example, the thickness direction of the housing 1 can be Figure 1 The direction is indicated by the double-headed arrow Y.

[0058] The battery of the above structure is provided with a first hole 6 on the side wall 101 of the shell 1, and a second hole 7 on the insulating rubber layer 5, and the overlapping area of ​​the first hole 6 and the second hole 7 is larger than the cross-sectional size of the pole 402. In this way, when the connecting piece 401 is insulated and connected to the side wall 101 of the shell 1 through the insulating rubber layer 5, the pole 402 passes through the overlapping area of ​​the first hole 6 and the second hole 7, so that at least part of the connecting piece 401 is exposed in the overlapping area, and then the connecting piece 401 exposed in the overlapping area is connected to the second pole ear 302 through the first weld mark 13. In this way, the connection between the pole assembly 4 and the second pole ear 302 can be achieved by welding. Compared with the riveting connection method, the welding connection method has a simpler process and lower cost, and can avoid the problem of poor battery air tightness or short circuit caused by dimensional deviation during riveting.

[0059] In addition, the battery of this structure has a first hole 6 formed in the side wall of the shell 1, a second hole 7 formed in the insulating rubber layer 5, and the pole 402 passes through the first hole 6 and the second hole 7. In this way, when the connecting piece 401 is insulated and connected to the side wall of the shell 1 through the insulating rubber layer 5, at least part of the connecting piece 501 will be exposed in the overlapping area, and then the connecting piece 401 exposed in the overlapping area of ​​the first hole 6 and the second hole 7 will be connected to the second pole lug 302 through the first weld mark 13, and in the width direction of the shell 1, the projection of the first weld mark 13 and the projection of the pole 402 do not overlap. In this way, the connection between the pole assembly 4 and the second pole lug 302 can be achieved by welding. Compared with the riveting connection method, the welding connection method has a simpler process and lower cost, and can avoid the problem of poor battery air tightness or short circuit caused by dimensional deviation during riveting. Furthermore, the projection of the first weld mark 13 and the projection of the pole 402 do not overlap, thereby preventing the welding of the second pole ear 302 and the connecting piece 401 and the pole 402 from affecting each other in the length direction of the battery cell 3, ensuring that the two do not interfere with each other. At the same time, it means that the welding of the second pole ear 302 and the connecting piece 401 and the position of the pole 402 are arranged along the width direction, making full use of the space in the width direction of the battery cell 1, avoiding occupying the space in the length direction of the battery, and effectively improving the energy density of the battery.

[0060] In some embodiments, Figures 1 to 5As shown, the battery includes a pole lead-out piece 8 and an insulating layer 9. The pole lead-out piece 8 is used to connect with the protruding end of the pole 402 to increase the contact area of ​​the pole 402, so as to facilitate connection with the connecting end of the electrical equipment; the insulating layer 9 is arranged between the pole lead-out piece 8 and the side wall 101 of the shell 1. Since the pole lead-out piece 8 and the pole 402 have the same polarity, the insulating layer 9 is arranged to avoid the connection contact between the pole lead-out piece 8 and the shell 1 to avoid short circuit. Specifically, the pole lead-out piece 8 and the insulating layer 9 are both provided with a avoidance hole 10 for avoiding the pole 402, the pole lead-out piece 8 is connected to the pole 402, and the pole lead-out piece 8 covers the first weld mark 13. That is to say, the avoidance hole 10 only allows the pole 402 to protrude from the side wall 101 of the shell 1, so that the connection area between the pole lead-out piece 8 and the connecting component of the electrical equipment can be increased, so as to facilitate the connection between the pole lead-out piece 8 and the lead-out end of the electrical equipment and ensure the stability of the connection.

[0061] In other embodiments, Figure 6 and 9 As shown in Figures 1 to 11, the battery also includes a pole lead-out sheet 8 and an insulating layer 9, and the insulating layer 9 is arranged between the pole lead-out sheet 8 and the side wall 101 of the housing 1; wherein, the pole lead-out sheet 8 and the insulating layer 9 are both provided with a avoidance hole 10 for avoiding the pole 402, the pole lead-out sheet 8 is connected to the pole 402, and the first weld mark 13 is exposed in the avoidance hole 10, that is, at least part of the connecting sheet 401 is exposed in the overlapping area of ​​the first hole 6, the second hole 7, the avoidance hole 10 of the pole lead-out sheet 8 and the avoidance hole 10 of the insulating layer 9. With such an arrangement, after the insulating layer 9 and the pole lead-out sheet 8 are installed, the connecting sheet 401 and the second pole lug 302 can be connected together by welding, so that the insulating layer 9 and the pole lead-out sheet 8 do not need to be installed after the welding position of the connecting sheet 401 and the second pole lug 302 is cooled, thereby reducing the waiting time for welding cooling, thereby improving the assembly efficiency of the battery.

[0062] In some embodiments, the battery includes a pole lead-out sheet 8 and an insulating layer 9, wherein the insulating layer 9 is disposed between the pole lead-out sheet 8 and the side wall of the shell 1; wherein the pole 402 is formed on the pole lead-out sheet 8, and the pole 402 extends inward from the outside of the shell 1 and is connected to the connecting sheet 401. In other words, the pole lead-out sheet 8 and the pole 402 are integrally formed, and one end of the pole 402 away from the pole lead-out sheet 8 is connected to the connecting sheet 401. With such a configuration, the polarity of the first pole piece of the battery cell 3 can also be led out, and in this solution, when thermal runaway occurs inside the battery, the temperature inside the battery rises and the insulating layer 9 is melted, so that the high-pressure gas can be released from this position to the outside of the battery, thereby preventing the battery from exploding and improving the safety of the battery.

[0063] In some embodiments, in the protruding direction of the pole 402, the size of the first weld mark 13 is less than or equal to the size of the pole 402. In other words, the height of the first weld mark 13 does not exceed the protruding end of the pole 402, so that the sharp part of the end of the first weld mark 13 can be prevented from protruding, so as to prevent the first weld mark 13 from interfering with the installation of the connection end of the subsequent electrical equipment. And it can also prevent the end of the first weld mark 13 from scratching other parts.

[0064] In some embodiments, at least one of the first hole 6, the second hole 7, the opening of the pole lead-out sheet 8, and the opening of the insulating layer 9 is a waist-shaped hole. In this way, by setting at least one of the first hole 6 and the second hole 7 as a waist-shaped hole, and setting the pole 402 at one end in the length direction of the waist-shaped hole, and setting the first weld mark 13 at the other end in the length direction of the waist-shaped hole, the distance between the pole 402 and the first weld mark 13 can be increased, thereby reducing the thermal effect of the first weld mark 13 on the pole 402 during welding, and even avoiding the deformation of the pole 402 due to heat during welding. And at least one of the opening of the pole lead-out sheet 8 and the opening of the insulating layer 9 is set as a waist-shaped hole, so as to facilitate the pole 402 to pass through the pole lead-out sheet 8 and the insulating layer 9, so as to facilitate the connection between the pole 402 and the pole lead-out sheet 8.

[0065] In addition, at least one of the first hole 6 , the second hole 7 , the opening of the pole lead-out plate 8 and the opening of the insulating layer 9 may also be in the shape of a polygonal hole, a circular hole, an elliptical hole, a special-shaped hole or the like.

[0066] In some embodiments, the ratio of the length to the width of the waist-shaped hole is greater than or equal to 1.5. Exemplarily, the ratio of the length to the width of the waist-shaped hole can be: 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.5, 3, 4, 5, etc. Here, by setting the ratio of the length to the width of the waist-shaped hole in the above range, the distance between the first weld mark 13 and the pole 402 can be further increased, and the influence of the first weld mark 13 on the pole 402 when it is formed can be further reduced, thereby improving the stability of the pole 402 structure.

[0067] In addition, the ratio of the length to the width of the waist-shaped hole can also be greater than 1 and less than 1.5.

[0068] In some embodiments, in the direction in which the pole 402 protrudes, the contour of the connecting piece 401 overlaps with the side wall 101, which can ensure the airtightness of the connection between the connecting piece 401 and the side wall 101, and avoid air leakage from the connection position between the connecting piece 401 and the side wall 101. And the width of the overlapping position is D, where D satisfies: D ≥ 0.5mm. Here, ensuring that the above-mentioned overlapping position is within the above-mentioned range can increase the contact area between the connecting piece 401 and the side wall 101, improve the stability of the connection between the connecting piece 401 and the side wall 101, and thus improve the stability of the battery structure.

[0069] Illustratively, the width of the overlapping position may be 0.5 mm, 0.6 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 3 mm, 5 mm, 10 mm, and the like.

[0070] In some embodiments, the battery further includes a reinforcing sheet (not shown) located outside the shell 1, and the first pole tab 301, the shell 1 and the reinforcing sheet are welded together. Specifically, the reinforcing sheet is provided to make the first pole tab 301 and the shell 1 welded more tightly, thereby preventing the first pole tab 301 from having a leaky weld or a cold weld.

[0071] Furthermore, in some embodiments, a groove is opened in the shell 1 (not shown in the figure), the reinforcement sheet is located in the groove, and the reinforcement sheet does not protrude from the notch of the groove. This arrangement is to prevent the reinforcement sheet from exceeding the edge of the shell 1 later, thereby avoiding the size of the battery from increasing, thereby avoiding affecting the energy density of the battery.

[0072] In some embodiments, since the shell 1 of the battery is usually made of stainless steel or aluminum, the bonding stability between the insulating adhesive layer 5 and the side wall 101 of the shell 1 is poor, and there is a risk that the connecting piece 401 falls off from the side wall 101. Therefore, a nickel plating layer is provided on the side of the side wall 101 close to the insulating adhesive layer 5, so that the bonding stability between the insulating adhesive layer 5 and the side wall 101 of the shell 1 and the connecting piece 401 can be ensured, and the risk of the connecting piece 401 falling off from the side wall 101 is reduced. And the thickness of the nickel plating layer is L, where L satisfies: 0.5μm≤L≤3μm. Such a setting can avoid the nickel plating layer being too thin and not having the effect of improving the bonding ability, and can also avoid the nickel plating layer being too thick to avoid increasing the ineffective thickness of the battery, so that the stability of the connection between the connecting piece 401 and the side wall 101 through the insulating adhesive layer 5 can be further ensured, and the probability of the connecting piece 401 falling off from the side wall 101 can be further reduced.

[0073] Illustratively, the thickness of the nickel plating layer may be 0.5 μm, 0.6 μm, 0.7 μm, 0.9 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 2.8 μm, 2.9 μm, 3 μm, and the like.

[0074] In some embodiments, a groove 12 is provided on the cover body 2, and the thickness of the groove 12 is smaller than the thickness of the rest of the battery, so that when the battery has thermal runaway, high-pressure gas can quickly rush out from the groove 12, quickly relieve the pressure of the battery, and avoid battery explosion.

[0075] Furthermore, the groove 12 is non-linear, that is, the shape of the groove 12 is curved. This arrangement can facilitate pressure relief on the groove 12 when thermal runaway occurs in the battery, shorten the pressure relief time, improve the pressure relief efficiency, and improve the safety of the battery.

[0076] Furthermore, on a plane perpendicular to the cover 2, the depth of the groove 12 is greater than half the thickness of the cover 2. This arrangement can further improve the exhaust efficiency when the battery has thermal runaway, and further improve the safety of the battery.

[0077] In some embodiments, when the battery cell 3 in the battery has thermal runaway, the temperature in the battery rises and the pressure at the edge of the battery is relatively high, that is, the edge of the cover 2 will first generate relatively high pressure. Here, by locating the groove portion 12 in the edge area of ​​the cover 2, the pressure can be released as quickly as possible when the battery has thermal runaway, thereby further improving the safety of the battery during use.

[0078] Furthermore, the shape of the groove portion 12 can be one of curve, S-shape, circle, arc or a combination thereof. By setting the shape of the groove portion 12 to the above-mentioned type, when thermal runaway occurs in the battery, the groove portion 12 with the above-mentioned shape is easier to release pressure than the linear groove portion 12. That is to say, under the same pressure, the groove portion 12 with the above-mentioned shape can be broken through by gas more quickly, thereby improving the pressure release efficiency of the groove portion 12 and improving the safety of the battery.

[0079] In some embodiments, the battery includes an insulating sheet 11 disposed between the body of the battery cell 3 and the tab of the battery cell 3, and the insulating sheet 11 is provided with a circumvention groove 1101 for circumventing the tab. Since the battery housing 1 and the first tab 301 have the same polarity, such a configuration can prevent the end of the second tab of the battery cell 3 from being connected to the battery housing 1, prevent a short circuit between the positive and negative electrodes of the battery cell 3, and improve the safety of the battery cell 3.

[0080] In some embodiments, the side wall 101 is connected to the first pole lug 301 of the battery cell 3 through the second weld mark 14, and the side wall 101 forms the second pole of the battery. The cross-sectional size of the second weld mark 14 gradually decreases from the side wall 101 to the first pole lug 301, which can improve the stability of the connection between the side wall 101 and the first pole lug 301 by the second weld mark 14, avoid the problem of welding leakage, and improve the stability of the connection between the side wall 101 and the first pole lug 301.

[0081] In some embodiments, the cover 2 is connected to the side wall 101 of the shell 1 by a third weld, and the outline of the cover 2 exceeds the side wall 101 by a dimension H, where H satisfies: H≤0.3mm. Here, the outline of the cover 2 is ensured to exceed the side wall 101 of the shell 1 to ensure that when the cover 2 and the shell 1 are welded, the cover 2 is welded to the shell 1, and the outline of the cover 2 exceeds the dimension of the side wall 101 within the above range, which can avoid the cover 2 being too large, reduce the volume of the battery, avoid excessive increase in the energy density of the battery, and make the size of the battery regular.

[0082] In some embodiments, the housing 1 includes a protrusion (not shown in the figure), and the pole assembly 4 is located in the protrusion. Since the first pole ear 301 and the pole assembly 4 need to be insulated from the housing 1 and the pole assembly 4 needs to protrude from the housing 1, compared with the lead-out method of the second pole ear 302, the lead-out method of the first pole ear 301 requires a larger space for the pole assembly 4, while the lead-out method of the second pole ear 302 requires a smaller space. By providing the protrusion to increase the space for the lead-out component of the first pole ear 301, that is, the second pole ear 302, the connecting piece 401 and the pole 402 are all located in the protrusion, which can improve the energy density of the battery.

[0083] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0084] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0085] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0086] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0087] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0088] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery, characterized in that: include: A shell and a cover body buckled on the shell; A battery cell is located in a cavity enclosed by the shell and the cover, and a first electrode tab of the battery cell is conductively connected to the shell; A pole assembly is provided on the housing and connected to the second pole lug of the battery cell, wherein the pole assembly comprises a connecting piece and a pole; An insulating rubber layer, disposed between the connecting piece and the side wall of the housing; A first hole is formed on the side wall of the shell, a second hole is formed on the insulating rubber layer, the pole passes through the first hole and the second hole, at least a part of the connecting piece is exposed in the overlapping area of ​​the first hole and the second hole, and the connecting piece exposed in the overlapping area of ​​the first hole and the second hole is connected to the second pole ear through a first weld mark; and in the width direction of the shell, the projection of the first weld mark and the projection of the pole do not overlap.

2. The battery according to claim 1, characterized in that include: Pole lead-out piece; An insulating layer, disposed between the pole lead-out piece and the side wall of the shell; The pole lead-out piece and the insulating layer are both provided with avoidance holes for avoiding the pole, the pole lead-out piece is connected to the pole, and the pole lead-out piece covers the first weld mark, or the first weld mark is exposed in the avoidance hole.

3. The battery according to claim 1, characterized in that include: Pole lead-out piece; An insulating layer, disposed between the pole lead-out piece and the side wall of the shell; The pole is formed on the pole lead-out piece, and the pole extends inward from the outer side of the shell and is connected to the connecting piece.

4. The battery according to claim 2 or 3, characterized in that: At least one of the first hole, the second hole, the opening of the pole lead-out plate and the opening of the insulating layer is a waist-shaped hole; and a ratio of the length to the width of the waist-shaped hole is greater than or equal to 1.

5.

5. The battery according to claim 1, characterized in that In the protruding direction of the pole, the contour of the connecting piece overlaps with the side wall, and the width of the overlapping position is D, where D satisfies: D ≥ 0.5 mm; and / or, The battery further includes a reinforcing sheet located outside the shell, and the first electrode tab, the shell and the reinforcing sheet are welded together.

6. The battery according to claim 1, characterized in that A nickel-plated layer is disposed on a side of the side wall close to the insulating adhesive layer, and the thickness of the nickel-plated layer is L, wherein L satisfies: 0.5 μm≤L≤3 μm.

7. The battery according to claim 1, characterized in that The cover body is provided with a non-linear groove portion, which is on a plane perpendicular to the cover body.

8. The battery according to claim 7, characterized in that The groove portion is located at the edge area of ​​the cover body; and / or, The depth of the groove portion is greater than half the thickness of the cover body; and / or, The shape of the groove portion is a curve, an S-shape, a circle, or an arc.

9. The battery according to claim 1, characterized in that It comprises an insulating sheet arranged between the body of the battery core and the pole ear of the battery core, and the insulating sheet is provided with an avoidance groove for avoiding the pole ear.

10. The battery according to claim 1, characterized in that The side wall is connected to the first pole tab of the battery cell through a second weld mark, and the cross-sectional size of the second weld mark gradually decreases from the side wall to the first pole tab.

11. The battery according to claim 1, characterized in that The cover body is connected to the side wall of the shell through a third weld, and the outline of the cover body exceeds the side wall by a dimension H, wherein H satisfies: H≤0.3 mm.

12. The battery according to claim 1, characterized in that The housing includes a protrusion, and the pole assembly is located in the protrusion.

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