Battery and battery module

Abstract

The utility model provides a battery and a battery module, the battery comprises a battery cell and a pole electrically connected with the battery cell, and one side of the pole is provided with an accommodating groove; wherein at least one through hole is formed in the bottom surface of the groove wall of the accommodating groove, and the accommodating groove comprises at least two welding areas; the tabs of the battery cell comprise at least two tab groups with the same polarity, each tab group comprises at least one layer of tabs, and the at least two tab groups penetrate through the at least one through hole and are welded with the at least two welding areas in a one-to-one correspondence manner. The battery provided by the embodiment of the utility model can reduce the current density of the pole, improve the working stability of the battery and prolong the service life of the battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and a battery module. BACKGROUND

[0002] The battery of the battery module usually comprises a shell and a battery cell, the winding core of the battery cell is installed in the shell, and the tab of the battery cell is connected with the pole after penetrating through the shell. In the related art, the multiple layers of tabs with the same polarity of the battery cell are usually welded together, and then the multiple layers of tabs welded together are welded with the pole. This way of welding the multiple layers of tabs with the same polarity and the pole together can cause the current in the pole to be too concentrated, and thus the part of the pole for connecting with the tab can be seriously heated. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a battery and a battery module, which can improve the working stability and service life of the battery.

[0004] In a first aspect, embodiments of the present application provide a battery, comprising:

[0005] a battery cell and a pole electrically connected with the battery cell, a containing groove is formed on one side of the pole;

[0006] wherein a bottom surface of a groove wall of the containing groove is provided with at least one through hole, and comprises at least two welding areas; the tab of the battery cell comprises at least two tab groups with the same polarity, each of the at least two tab groups comprises at least one layer of the tab, and the at least two tab groups pass through the at least one through hole and are welded with the at least two welding areas one by one.

[0007] In some embodiments, the bottom surface of the groove wall of the containing groove comprises two welding areas, and the through hole is located between the two welding areas; the tab of the battery cell comprises two tab groups with the same polarity, and the two tab groups pass through the through hole and are welded with the two welding areas one by one.

[0008] In some embodiments, the bottom surface of the groove wall of the containing groove comprises a plurality of through holes and a plurality of welding areas, the number of the plurality of through holes is equal to the number of the plurality of welding areas; the tab of the battery cell comprises a plurality of tab groups with the same polarity, the number of the plurality of tab groups is equal to the number of the plurality of through holes, the plurality of tab groups pass through the plurality of through holes one by one, and are welded with the plurality of welding areas one by one.

[0009] In some embodiments, the plurality of through holes and the plurality of welding areas are alternately distributed along the same direction.

[0010] In some embodiments, the bottom surface of the slot wall of the accommodating slot comprises two through holes and two welding areas, and the two welding areas are located between the two through holes; or the two through holes are located between the two welding areas.

[0011] In some embodiments, the accommodating slot is located on the side of the pole away from the battery cell.

[0012] In some embodiments, the battery further comprises a pole cover connected with the pole and covering the accommodating slot; the pole comprises an end surface located on the side of the pole away from the battery cell.

[0013] The pole cover protrudes from the end surface; or the surface of the pole cover away from the accommodating slot is flush with the end surface.

[0014] In some embodiments, the end surface is provided with a mounting slot extending along the circumference of the accommodating slot; the edge of the pole cover is mounted in the mounting slot, and the thickness of the pole cover is greater than or equal to the depth of the mounting slot.

[0015] In some embodiments, the pole comprises a first pole and a second pole, the tabs of the battery cell comprise at least two first tab groups and at least two second tab groups, the first tab group and the second tab group each comprise at least one layer of tabs, the two first tab groups pass through the at least one through hole of the first pole and are welded one-to-one with the at least two welding areas of the first pole, and the two second tab groups pass through the at least one through hole of the second pole and are welded one-to-one with the at least two welding areas of the second pole.

[0016] In some embodiments, the battery cell comprises a plurality of roll cores, and the tabs with the same polarity of each roll core form the at least two tab groups.

[0017] In some embodiments, the number of the at least two tab groups is equal to the number of the roll cores, and the at least two tab groups are connected one-to-one.

[0018] In some embodiments, the battery further comprises a shell and a cover plate, the shell and the cover plate enclose a mounting cavity, the cover plate is provided with a mounting hole penetrating the cover plate along the thickness direction of the cover plate, the battery cell is mounted in the mounting cavity, and the pole passes through the mounting hole and is connected with the cover plate.

[0019] In some embodiments, the outer periphery of the pole is provided with an abutting portion located at the end of the pole close to the battery cell, and the abutting portion abuts against the side of the cover plate facing the battery cell.

[0020] In a second aspect, the embodiments of the present application provide a battery module, which comprises the battery as described above, and the battery comprises:

[0021] The battery cell and the pole post electrically connected with the battery cell, and the pole post is provided with a receiving groove on one side;

[0022] The bottom surface of the groove wall of the receiving groove is provided with at least one through hole, and comprises at least two welding areas; the tab of the battery cell comprises at least two tab groups with the same polarity, each of the tab groups comprises at least one layer of the tab, and the at least two tab groups pass through the at least one through hole and are welded with the at least two welding areas one by one.

[0023] The battery provided by the embodiments of the present application can make the at least two tab groups pass through the through hole of the pole post and be welded with the at least two welding areas one by one by dividing the tabs with the same polarity of the battery cell into at least two tab groups, making each tab group comprise at least one layer of tab, and forming at least one through hole on the bottom surface of the groove wall of the pole post and at least two welding areas, so that the parts of the pole post connected with the tabs with the same polarity of the battery cell are dispersed to the at least two welding areas, the current in the pole post is also correspondingly shunted to the at least two welding areas of the pole post, which is beneficial to reduce the current concentration in the pole post, reduce the current density at the connection between the pole post and the tab, reduce the temperature at the connection between the pole post and the tab, and thus improve the working stability and service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows, and the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] Figure 1 The structural schematic diagram of one embodiment of the battery provided by the embodiments of the present application;

[0026] Figure 2 The partial view of the sectional view of one embodiment of the battery provided by the embodiments of the present application, wherein the sectioning surface is parallel to the thickness direction of the battery;

[0027] Figure 3 The cooperation structure schematic diagram of one embodiment of the cover plate, the pole post and the pole post cover provided by the embodiments of the present application

[0028] Figure 4 The cooperation structure schematic diagram of one embodiment of the battery cell, the cover plate, the pole post and the pole post cover provided by the embodiments of the present application; wherein, two tab groups are not bent;

[0029] Figure 5 The cooperation structure schematic diagram of one embodiment of the battery cell, the cover plate, the pole post and the pole post cover provided by the embodiments of the present application; wherein, two tab groups are not bent;Figure 4 Structure diagram of the battery after the two sets of tab groups are bent;

[0030] Figure 6 Partial view of the cross-sectional view of another embodiment of the battery provided by the embodiment of the application, wherein the cross-sectional surface is parallel to the thickness direction of the battery;

[0031] Figure 7 Structure diagram of one embodiment of the pole provided by the embodiment of the application;

[0032] Figure 8 Structure diagram of another embodiment of the pole provided by the embodiment of the application.

[0033] Battery 100; shell 110; mounting cavity 1101; shell body 111; cover plate 112; mounting hole 1121; lower plastic part 1122; light aluminum sheet 1123; upper plastic part 1124; sealing part 1125; battery cell 120; roll core 121; tab group 1220; pole 130; accommodating groove 1300; bottom surface 1301; through hole 1302; end surface 1303; mounting groove 1304; welding area 1305; abutting part 1306; pole cover 140. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and the specific direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0035] Figure 1 Structure diagram of one embodiment of the battery provided by the embodiment of the application. Figure 2 Partial view of the cross-sectional view of one embodiment of the battery provided by the embodiment of the application, wherein the cross-sectional surface is parallel to the thickness direction of the battery. As Figure 1 and Figure 2As shown, the battery 100 includes the battery cell 120 and the pole 130, the battery cell 120 is electrically connected with the pole 130, a receiving groove 1300 is arranged on one side of the pole 130, at least one through hole 1302 is arranged on the bottom surface 1301 of the groove wall of the receiving groove 1300 of the pole 130, and the bottom surface 1301 of the groove wall of the receiving groove 1300 of the pole 130 includes at least two welding areas 1305.

[0036] Among them, the tab of the battery cell 120 can include at least two tab groups 1220 with the same polarity, each tab group 1220 includes at least one layer of tabs, and the at least two tab groups 1220 pass through the at least one through hole 1302 of the pole 130 and are welded one by one with the at least two welding areas 1305 of the pole 130.

[0037] The battery 100 provided by the embodiment of the present application can make the tabs with the same polarity of the battery cell 120 into at least two tab groups 1220, make each tab group 1220 include at least one layer of tabs, and arrange at least one through hole 1302 on the bottom surface 1301 of the groove wall of the receiving groove 1300 of the pole 130, and form at least two welding areas 1305 on the bottom surface 1301, when the at least two tab groups 1220 with the same polarity of the battery cell 120 pass through the through hole 1302 of the pole 130 and are welded one by one with the at least two welding areas 1305 of the pole 130, the part of the pole 130 connected with the tabs with the same polarity of the battery cell 120 can be dispersed to the at least two welding areas 1305, and the current in the pole 130 can also be correspondingly shunted to the at least two welding areas 1305 of the pole 130, which is beneficial to reduce the current concentration in the pole 130, reduce the current density in the connection between the pole 130 and the tab, and further reduce the temperature of the connection between the pole 130 and the tab, thereby improving the working stability and service life of the battery 100.

[0038] In addition, by dividing the tabs with the same polarity of the battery cell 120 into at least two tab groups 1220 with at least one layer of tabs, it is not necessary to stack and weld all the tabs with the same polarity of the battery cell 120 together, which is beneficial to reduce the maximum length of the tab, thereby reducing the maximum resistance of the tab and improving the electrical performance of the tab.

[0039] Finally, by dividing the tabs with the same polarity of the battery cell 120 into at least two tab groups 1220 with at least one layer of tabs, the overall thickness of the tabs of the battery cell 120 in the height direction of the battery 100 can be reduced, which is beneficial to reduce the height of the battery 100.

[0040] It should be noted that the same-polarity tabs of the battery cell 120 can include two, three or more tab groups 1220, and each tab group 1220 can include one, two, three or more layers of tabs. The number of the welding areas 1305 of the pole 130 can be two, three or more, and the number of the welding areas 1305 of the pole 130 is equal to the number of the corresponding tab groups 1220.

[0041] In some embodiments, as shown in FIG. 1, the accommodation groove 1300 can be located on the side of the pole 130 away from the battery cell 120, so as to facilitate the welding of the at least two tab groups 1220 of the battery cell 120 to the at least two welding areas 1305 of the pole 130 one by one. Figures 2 to 4

[0042] The bottom surface 1301 of the groove wall of the accommodation groove 1300 of the pole 130 includes at least two welding areas 1305. Meanwhile, the same-polarity tabs of the battery cell 120 include at least two tab groups 1220, and each tab group 1220 includes at least one layer of tabs, and the at least two tab groups 1220 are welded to the at least two welding areas 1305 one by one.

[0043] It should be noted that the number of the through holes 1302 on the pole 130 can be one, and the at least two tab groups 1220 of the battery cell 120 pass through the same through hole 1302 and are welded to the at least two welding areas 1305 one by one. Alternatively, the number of the through holes 1302 can be two or more. When the number of the tab groups 1220 is equal to the number of the through holes 1302, the plurality of tab groups 1220 can pass through the plurality of through holes 1302 one by one; when the number of the tab groups 1220 exceeds the number of the through holes 1302, part of the plurality of tab groups 1220 can pass through the same through hole 1302.

[0044] In some embodiments, the plurality of layers of tabs of the tab group 1220 can be welded to each other, so as to improve the structural strength of the tab group 1220, and meanwhile, the welding of the tab group 1220 to the welding area 1305 of the pole 130 can be more simple and convenient. Specifically, the tab group 1220 can be bent to the position adhering to the welding area 1305 after passing through the through hole 1302 of the pole 130, and then the tab group 1220 can be welded to the welding area 1305.

[0045] In some embodiments, as shown in FIG. 1, the accommodation groove 1300 can be located on the side of the pole 130 away from the battery cell 120, so as to facilitate the welding of the at least two tab groups 1220 of the battery cell 120 to the at least two welding areas 1305 of the pole 130 one by one. Figures 2 to 5 ​As shown, the bottom surface 1301 of the slot wall of the accommodating slot 1300 of the pole column 130 can include two welding areas 1305 distributed on both sides of the through hole 1302. Correspondingly, the tab of the battery cell 120 includes two tab groups 1220 with the same polarity, which pass through the through hole 1302 and are welded one-to-one with the two welding areas 1305. In this way, the current in the pole column 130 can be shunted to the two welding areas 1305, thereby reducing the current density in the pole column 130 and reducing the heat and temperature generated by each welding area 1305. Wherein, after the two tab groups 1220 of the battery cell 120 pass through the same through hole 1302, they can be bent away from each other, so that the two tab groups 1220 are attached to and welded with the two welding areas 1305 on both sides of the through hole 1302.

[0046] In other embodiments, as shown in FIG. 13, the bottom surface 1301 of the slot wall of the accommodating slot 1300 of the pole column 130 can include a plurality of through holes 1302 and a plurality of welding areas 1305. The number of the plurality of through holes 1302 is equal to the number of the plurality of welding areas 1305. Correspondingly, the tab of the battery cell 120 includes a plurality of tab groups 1220 with the same polarity, and the number of the plurality of tab groups 1220 is equal to the number of the plurality of through holes 1302. The plurality of tab groups 1220 pass through the plurality of through holes 1302 one-to-one and are welded with the plurality of welding areas 1305 one-to-one, thereby shunting the current in the pole column 130 to the plurality of welding areas 1305 to reduce the current density in the pole column 130 and reduce the heat and temperature generated by each welding area 1305. Figure 6 Specifically, as shown in FIG. 12, the bottom surface 1301 of the slot wall of the accommodating slot 1300 of the pole column 130 can include two through holes 1302 and two welding areas 1305, and the two welding areas 1305 are located between the two through holes 1302. Thus, the two tab groups 1220 of the battery cell 120 can be bent towards each other after passing through the two through holes 1302 one-to-one, so that the two tab groups 1220 are attached to and welded with the two welding areas 1305 between the two through holes 1302 one-to-one.

[0047] Figure 6 Alternatively, as shown in FIG. 13, the two through holes 1302 of the pole column 130 can also be located between the two welding areas 1305. Thus, the two tab groups 1220 of the battery cell 120 can be bent away from each other after passing through the two through holes 1302 one-to-one, so that the two tab groups 1220 are attached to and welded with the two welding areas 1305 on both sides of the two through holes 1302 one-to-one.

[0048] In other embodiments, as shown in FIG. 13, the bottom surface 1301 of the slot wall of the accommodating slot 1300 of the pole column 130 can include a plurality of through holes 1302 and a plurality of welding areas 1305. The number of the plurality of through holes 1302 is equal to the number of the plurality of welding areas 1305. Correspondingly, the tab of the battery cell 120 includes a plurality of tab groups 1220 with the same polarity, and the number of the plurality of tab groups 1220 is equal to the number of the plurality of through holes 1302. The plurality of tab groups 1220 pass through the plurality of through holes 1302 one-to-one and are welded with the plurality of welding areas 1305 one-to-one, thereby shunting the current in the pole column 130 to the plurality of welding areas 1305 to reduce the current density in the pole column 130 and reduce the heat and temperature generated by each welding area 1305. Figure 7 In other embodiments, as shown in FIG. 13, the bottom surface 1301 of the slot wall of the accommodating slot 1300 of the pole column 130 can include a plurality of through holes 1302 and a plurality of welding areas 1305. The number of the plurality of through holes 1302 is equal to the number of the plurality of welding areas 1305. Correspondingly, the tab of the battery cell 120 includes a plurality of tab groups 1220 with the same polarity, and the number of the plurality of tab groups 1220 is equal to the number of the plurality of through holes 1302. The plurality of tab groups 1220 pass through the plurality of through holes 1302 one-to-one and are welded with the plurality of welding areas 1305 one-to-one, thereby shunting the current in the pole column 130 to the plurality of welding areas 1305 to reduce the current density in the pole column 130 and reduce the heat and temperature generated by each welding area 1305.

[0049] Figure 8 ​​As shown, the plurality of through holes 1302 and the plurality of welding areas 1305 of the pole 130 can also be alternately distributed in the same direction. In this way, the plurality of tab groups 1220 of the battery cell 120 can be correspondingly passed through the plurality of through holes 1302 and then bent in the same direction, so that the plurality of tab groups 1220 are correspondingly attached to and welded with the plurality of welding areas 1305.

[0050] In some embodiments, as shown in Figures 2 to 4 As shown, the shell 110 can include a housing 111 and a cover plate 112, which enclose a mounting cavity 1101. The cover plate 112 is provided with a mounting hole 1121, which penetrates the cover plate 112 along the thickness direction of the cover plate 112, and the pole 130 is connected to the cover plate 112 through the mounting hole 1121, so that the connection between the pole 130 and the shell 110 is more stable.

[0051] In this way, the tab group 1220 can be passed through the mounting hole 1121 of the cover plate 112 and at least one through hole 1302 of the pole 130, and then the part of the tab group 1220 located in the accommodating groove 1300 of the pole 130 is bent to make the tab group 1220 attached to and welded with the bottom surface 1301 of the accommodating groove 1300 of the pole 130, so that the tab group 1220 and the pole 130 are connected together.

[0052] In some embodiments, as shown in Figure 2 and Figure 3 As shown, the cover plate 112 includes a lower plastic part 1122, an aluminum sheet 1123, and an upper plastic part 1124, the aluminum sheet 1123 is arranged on the side of the lower plastic part 1122 away from the mounting cavity 1101, and the upper plastic part 1124 is arranged on the side of the aluminum sheet 1123 away from the lower plastic part 1122. The mounting hole 1121 penetrates the lower plastic part 1122, the aluminum sheet 1123, and the upper plastic part 1124.

[0053] In this way, the sealing member 1125 is arranged between the pole 130 and the aluminum sheet 1123, which is used to improve the sealing effect between the pole 130 and the inner circumferential surface of the mounting hole 1121. At the same time, the sealing member 1125 is made of rubber or other insulating materials, so as to keep the pole 130 and the aluminum sheet 1123 insulated.

[0054] In some embodiments, as shown in Figure 2As shown, a contact portion 1306 can be provided on the outer periphery of the electrode post 130. The contact portion 1306 is located at the end of the electrode post 130 near the cell 120, and the contact portion 1306 abuts against the side of the cover plate 112 facing the cell 120. Thus, the movement of the electrode post 130 relative to the cover plate 112 away from the cell 120 can be limited by the cooperation between the cover plate 112 and the contact portion 1306, making the connection between the electrode post 130 and the cover plate 112 more stable.

[0055] The contact portion 1306 extends circumferentially along the pole post 130 to further enhance the limiting effect on the pole post 130.

[0056] In some embodiments, such as Figures 1 to 5 As shown, the battery 100 can have two terminals 130, and the battery cell 120 can have two sets of tabs 1220 with opposite polarities. At least two sets of tabs 1220 of the same polarity are present, and the two sets of tabs 1220 with opposite polarities are connected to the two terminals 130 in a one-to-one correspondence. This allows the current in the two terminals 130 of the battery 100 to be evenly distributed to at least two welding areas 1305, thereby reducing heat generation in the two terminals 130.

[0057] In this configuration, one type of tab group 1220 can have a positive tab, and the terminal 130 connected to the positive tab of this tab group can be a positive terminal. The other type of tab group 1220 can have a negative tab, and the terminal 130 connected to the negative tab of this tab group can be a negative terminal.

[0058] Alternatively, the tabs of one polarity of the battery 100 can include at least two tab groups 1220, which are welded one-to-one with at least two welding areas 1305 of the corresponding terminal post 130. This can also reduce the current concentration within one terminal post 130.

[0059] Specifically, the cover plate 112 includes two mounting holes 1121, and two terminals 130 are mounted on the side of the cover plate 112 opposite to the mounting cavity 1101, with through holes 1302 of the two terminals 130 corresponding to and communicating with the two mounting holes 1121. The battery cell 120 includes two types of tab groups 1220 with opposite polarities, and the number of tab groups 1220 of the same polarity is at least two. Each tab group 1220 includes multiple layers of tabs stacked and welded together. For example... Figure 4 As shown, the two pairs of tabs 1220 of the battery cell 120, with opposite polarities, pass through the two mounting holes 1121 of the cover plate 112 and the through holes 1302 of the two terminals 130, respectively, as shown. Figure 5 As shown, the tabs 1220 of the same polarity are bent in opposite or opposite directions, so that the tabs 1220 of the same polarity are attached and welded to the welding areas 1305 of the corresponding pole post 130 in a one-to-one correspondence.

[0060] In some embodiments, the battery cell 120 may include a plurality of coils 121, with the tabs of the battery cell 120 electrically connected to the coils 121, thereby electrically connecting the coils 121 to the electrode post 130. Specifically, tabs of the same polarity for each coil 121 may form at least two tab groups 1220. This allows the current transmitted between each coil 121 and the electrode post 130 to be distributed across different welding areas 1305 of the electrode post 130, thereby reducing the current density within the electrode post 130.

[0061] The tab assembly 1220 connected to the core 121 can be located in the middle of the core 121 in the thickness direction, or it can be located closer to one side of the core 121 in the thickness direction, depending on the structure of the core 121 and the pole post 130. For example... Figures 2 to 5 As shown, there are two cores 121. The pole post 130 includes a through hole 1302, which allows two tabs 1220 of the same polarity connected to the two cores 121 to be brought close to each other, so that the two tabs 1220 can pass through the same through hole 1302 of the pole post 130 and be welded to the two welding areas 1305 of the pole post 130.

[0062] Or such as Figure 6 As shown, there are two cores 121, and the pole post 130 includes two through holes 1302, so that the tab assembly 1220 connected to the core 121 is located in the middle of the thickness direction of the core 121, so that the two tab assemblies 1220 can pass through the two through holes 1302 of the pole post 130 and be welded to the two welding areas 1305 of the pole post 130.

[0063] Furthermore, when there are two or more cores 121, each core 121 is connected to a tab, and the tabs of the same polarity connected to each core 121 are stacked to form multiple tab groups 1220. For example, 2... Figure 4 and Figure 5 As shown, the number of at least two tab groups 1220 of the battery cell 120 can be equal to the number of winding cores 121, and they can be connected one-to-one to improve the connection stability between each winding core 121 and the pole post 130.

[0064] like Figures 1 to 5 As shown, the battery 100 also includes a terminal cap 140, which is connected to the terminal 130 and covers the receiving groove 1300, thereby sealing the outer casing 110 and protecting the tab assembly 1220 inside the terminal 130. The terminal cap 140 can be welded to the terminal 130 to further improve the sealing performance between them.

[0065] In some embodiments, such asFigure 2 As shown in FIG. 1, the end face 1303 of the pole 130 is provided with a mounting groove 1304 extending along the circumferential direction of the accommodating groove 1300. The edge of the pole cover 140 is mounted in the mounting groove 1304, so that the position of the pole cover 140 and the pole 130 is relatively stable. Then, welding is performed along the edge of the pole cover 140 to weld the pole cover 140 and the pole 130 together.

[0066] Specifically, as shown in FIG. 1, the end face 1303 of the pole 130 is provided with a mounting groove 1304 extending along the circumferential direction of the accommodating groove 1300. The edge of the pole cover 140 is mounted in the mounting groove 1304, so that the position of the pole cover 140 and the pole 130 is relatively stable. Then, welding is performed along the edge of the pole cover 140 to weld the pole cover 140 and the pole 130 together. Figure 2

[0067] In some embodiments, as shown in FIG. 1, the thickness of the pole cover 140 can be greater than or equal to the depth of the mounting groove 1304, so that after the edge of the pole cover 140 is mounted in the mounting groove 1304 of the pole 130, the pole cover 140 protrudes from the end face 1303 of the pole 130, or the surface of the pole cover 140 away from the accommodating groove 1300 is flush with the end face 1303 of the pole 130.

[0068] In some embodiments, as shown in FIG. 1, the surface of the pole cover 140 towards the mounting groove 1304 of the pole 130 can be spaced apart from the tab group 1220, so as to avoid the problem that the pole cover 140 and the tab group 1220 abut, and the pole cover 140 and the pole 130 cannot be accurately positioned. Figure 2

[0069] The embodiments of the present application also provide a battery module, which comprises a battery. The specific structure of the battery is referred to the above-mentioned embodiments. Since the battery module adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0070] ​​The battery module provided in the embodiments of the present application divides the same-polarity tabs of the battery cell 120 into at least two tab groups 1220, so that each tab group 1220 includes at least one tab, and at least one through hole 1302 is formed in the bottom surface 1301 of the slot wall of the accommodating slot 1300 of the pole 130 and at least two welding areas 1305 are formed. After the at least two tab groups 1220 are welded one by one with the at least two welding areas 1305 of the pole 130, the positions where the pole 130 is connected with the same-polarity tabs of the battery cell 120 are dispersed to the at least two welding areas 1305, and the current in the pole 130 is also correspondingly shunted to the at least two welding areas 1305 of the pole 130, which is beneficial to reduce the current concentration in the pole 130, reduce the current density in the pole 130, and further reduce the temperature at the connection between the pole 130 and the tab, thereby improving the working stability and service life of the battery module.

[0071] In the embodiments of the present application, the battery module can include a plurality of batteries 100 arranged in sequence, and two end plates arranged at both ends of the arrangement direction of the plurality of batteries 100. The two end plates and the plurality of batteries 100 between the two end plates are bundled together by a steel belt to form the battery module.

[0072] The battery module in the embodiments of the present application can be used in a battery pack, which can be used in a vehicle or an energy storage system, which is not limited here.

[0073] The embodiments of the present application are described in detail above, and specific examples are applied to the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A battery, characterized by, The battery comprises: an electric core and a pole post electrically connected with the electric core, a receiving groove is formed on one side of the pole post; wherein, at least one through hole is formed on the bottom surface of the groove wall of the receiving groove, and the receiving groove comprises at least two welding areas; the tab of the electric core comprises at least two tab groups with the same polarity, each of the tab groups comprises at least one layer of the tab, and the at least two tab groups pass through the at least one through hole and are welded with the at least two welding areas one by one.

2. The battery of claim 1, wherein, The bottom surface of the groove wall of the receiving groove comprises two welding areas, and the through hole is located between the two welding areas; the tab of the electric core comprises two tab groups with the same polarity, and the two tab groups pass through the through hole and are welded with the two welding areas one by one.

3. The battery of claim 2, wherein the cathode is a lithium cobalt oxide cathode. The bottom surface of the groove wall of the receiving groove comprises a plurality of through holes and a plurality of welding areas, the number of the plurality of through holes is equal to the number of the plurality of welding areas; the tab of the electric core comprises a plurality of tab groups with the same polarity, the number of the plurality of tab groups is equal to the number of the plurality of through holes, the plurality of tab groups pass through the plurality of through holes one by one, and the plurality of tab groups are welded with the plurality of welding areas one by one.

4. The battery of claim 3, wherein the cathode is a lithium cobalt oxide cathode. The plurality of through holes and the plurality of welding areas are alternately distributed in the same direction.

5. The battery of claim 3, wherein the cathode comprises a cathode active material, a cathode binder, and a cathode conductive agent. The bottom surface of the groove wall of the receiving groove comprises two through holes and two welding areas, and the two welding areas are located between the two through holes; or, the two through holes are located between the two welding areas.

6. The battery of claim 1, wherein the cathode comprises a lithium metal oxide. The receiving groove is located on the side of the pole post away from the electric core.

7. The battery of claim 6, wherein the cathode is a lithium cobalt oxide cathode. The battery further comprises a pole post cover connected with the pole post and covering the receiving groove; the pole post comprises an end face located on the side of the pole post away from the electric core; wherein, the pole post cover protrudes from the end face; or, the surface of the pole post cover away from the receiving groove is flush with the end face.

8. The battery of claim 7, wherein the cathode comprises a lithium metal oxide. The end face is provided with a mounting groove extending along the circumference of the receiving groove; the edge of the pole post cover is mounted in the mounting groove, and the thickness of the pole post cover is greater than or equal to the depth of the mounting groove.

9. The battery according to any one of claims 1 to 8, wherein The number of the pole posts is two, the tab of the electric core comprises two kinds of tab groups with opposite polarities, the number of the tab groups with the same polarity is at least two, and the two kinds of tab groups with opposite polarities are connected with the two pole posts one by one.

10. The battery according to any one of claims 1 to 8, wherein The electric core comprises a plurality of winding cores, and the tabs with the same polarity of each winding core form the at least two tab groups.

11. The battery of claim 10, wherein the cathode comprises a lithium metal oxide. The number of the at least two tab groups is equal to the number of the winding cores, and the at least two tab groups are connected one by one.

12. The battery of any one of claims 1 to 8, wherein, The battery further comprises a shell and a cover plate, the shell and the cover plate enclose a mounting cavity, the cover plate is provided with a mounting hole penetrating the cover plate along the thickness direction of the cover plate, the electric core is mounted in the mounting cavity, and the pole post passes through the mounting hole and is connected with the cover plate.

13. The battery of claim 12, wherein the cathode comprises a lithium metal oxide. The outer periphery of the pole post is provided with an abutting portion located at the end of the pole post close to the electric core, and the abutting portion abuts against the side of the cover plate facing the electric core.

14. A battery module, characterized by The battery module comprises the battery of any one of claims 1 to 13.

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