Battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery, the battery comprises a shell and a laminated battery cell, the shell comprises a positive electrode connecting part and a negative electrode connecting part which are arranged in an insulating manner, and the shell is provided with an accommodating space; the laminated battery cell is arranged in the accommodating space and comprises a battery cell body, a positive tab and a negative tab; the positive tab is electrically connected with the cell body and the positive connecting part, and the negative tab is electrically connected with the cell body and the negative connecting part; wherein the number of at least one of the positive tabs and the negative tabs is two, the two positive tabs are connected to different sides of the battery cell body, and / or the two negative tabs are connected to different sides of the battery cell body, so that the charge-discharge rate of the battery can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a battery. BACKGROUND

[0002] With the continuous development of the battery field, the performance requirement of the battery is also higher and higher.

[0003] The electric core inside the battery usually has two kinds of laminated core and winding core, for the laminated core, the laminated core is usually provided with a tab on a single side, the current reaches the transmission distance of each position of the laminated core through the tab, and it is difficult to quickly transmit to each position of the laminated core, and the charge-discharge rate is low. SUMMARY

[0004] The utility model discloses at least one of the technical problems in the prior art is solved, and for this purpose, the utility model provides a battery, which can improve the charge-discharge rate of the battery.

[0005] According to the battery provided by the utility model embodiment, the battery comprises a shell and a laminated core, the shell comprises a positive connection part and a negative connection part which are insulated, and is provided with an accommodating space; the laminated core is arranged in the accommodating space and comprises a core body, a positive tab and a negative tab; the positive tab is electrically connected with the core body and the positive connection part, and the negative tab is electrically connected with the core body and the negative connection part; wherein the number of at least one of the positive tab and the negative tab is two, two positive tabs are connected to different sides of the core body, and / or two negative tabs are connected to different sides of the core body.

[0006] According to the battery provided by the utility model embodiment, the battery has at least the following beneficial effects: the number of at least one of the positive tab and the negative tab of the laminated core is set to two, two positive tabs are connected to different sides of the core body and / or two negative tabs are connected to different sides of the core body, so that the current can enter the core body from the two positive tabs or the two negative tabs on different sides of the core body, which helps to shorten the transmission distance of the current on the core body, the current can be transmitted to each position of the core body more quickly, and the charge-discharge rate of the battery is improved.

[0007] According to some embodiments of the utility model, the positive tab and the negative tab are connected to different sides of the core body.

[0008] According to some embodiments of the utility model, the core body has a length direction and a width direction, the length size of the core body is greater than the width size of the core body; two positive tabs are connected to opposite sides of the core body along the width direction, and / or two negative tabs are connected to opposite sides of the core body along the length direction.

[0009] According to some embodiments of the present application, the cell body includes a first side, a second side, a third side and a fourth side, the first side and the third side are opposite, and the second side and the fourth side are opposite; the number of positive electrode ears is two, and the two positive electrode ears are defined as a first positive electrode ear and a second positive electrode ear; the number of negative electrode ears is two, and the two negative electrode ears are defined as a first negative electrode ear and a second negative electrode ear; wherein the first positive electrode ear is connected to the first side, the first negative electrode ear is connected to the second side, the second positive electrode ear is connected to the third side, and the second negative electrode ear is connected to the fourth side.

[0010] According to some embodiments of the present application, the two positive electrode ears are symmetrically connected to the opposite sides of the cell body, and / or the two negative electrode ears are symmetrically connected to the opposite sides of the cell body.

[0011] According to some embodiments of the present application, the laminated cell includes a plurality of positive electrode sheets, a plurality of negative electrode sheets and a plurality of separators, the positive electrode sheet includes a first current collecting area and a first empty foil area connected to each other, and the negative electrode sheet includes a second current collecting area and a second empty foil area connected to each other; the first current collecting area and the second current collecting area are alternately stacked, and the adjacent first current collecting area and the second current collecting area are provided with a separator for electrical isolation; a plurality of first current collecting areas, a plurality of separators and a plurality of second current collecting areas are stacked to form a cell body; a plurality of first empty foil areas are sequentially stacked to form a positive electrode ear, and a plurality of second empty foil areas are sequentially stacked to form a negative electrode ear.

[0012] According to some embodiments of the present application, a plurality of first empty foil areas are sequentially stacked and welded to form a positive electrode ear, and a plurality of second empty foil areas are sequentially stacked and welded to form a negative electrode ear; or, the laminated cell further includes a first connecting piece and a second connecting piece, the first connecting piece connects a plurality of first empty foil areas to connect a plurality of first empty foil areas to form a positive electrode ear; the second connecting piece connects a plurality of second empty foil areas to connect a plurality of second empty foil areas to form a negative electrode ear.

[0013] According to some embodiments of the present application, the positive electrode sheet further includes a third empty foil area, the third empty foil area and the first empty foil area are connected to different sides of the first current collecting area, and a plurality of third empty foil areas are sequentially stacked to form another positive electrode ear; and / or, the negative electrode sheet further includes a fourth empty foil area, the fourth empty foil area and the second empty foil area are connected to different sides of the second current collecting area, and a plurality of fourth empty foil areas are sequentially stacked to form another negative electrode ear.

[0014] According to some embodiments of the present application, the shell includes a positive shell and a negative shell, the positive shell and the negative shell are insulated and connected, and form a containing space; the positive shell and / or the negative shell is a rigid shell, the positive connecting part is located in the positive shell, and the negative connecting part is located in the negative shell.

[0015] According to some embodiments of the present invention, the battery further includes a positive electrode conductive element, with each positive electrode conductive element corresponding to a positive electrode tab, and the positive electrode conductive element is electrically connected to the positive electrode tab and the positive electrode connection portion; and / or, the battery further includes a negative electrode conductive element, with each negative electrode conductive element corresponding to a negative electrode tab, and the negative electrode conductive element is electrically connected to the negative electrode tab and the negative electrode connection portion.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 A cross-sectional structural diagram of the battery provided in an embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 A cross-sectional view of the battery from another perspective;

[0020] Figure 3 It shows Figure 1 Schematic diagram of the structure of a mid-layer laminated battery cell;

[0021] Figure 4 It shows Figure 1 Schematic diagram of the structure of the positive electrode;

[0022] Figure 5 It shows Figure 1 A schematic diagram of the structure of the negative electrode.

[0023] Figure label:

[0024] Battery 100;

[0025] Housing 110; Positive electrode housing 111; Positive electrode connection part 1111; Negative electrode housing 113; Negative electrode connection part 1131; Accommodating space 115;

[0026] 130 laminated cell; 131 cell body; 1311 on the first side; 1313 on the second side; 1315 on the third side; 1317 on the fourth side;

[0027] Positive electrode 133; First positive electrode 1331; Second positive electrode 1333;

[0028] Negative electrode 135; First negative electrode 1351; Second negative electrode 1353;

[0029] Positive electrode plate 137; First current collector region 1371; First empty foil region 1373; Third empty foil region 1375;

[0030] Negative plate 139; second current collecting area 1391; second empty foil area 1393; fourth empty foil area 1395;

[0031] Positive electrode conductive member 150; negative electrode conductive member 170; length direction X; width direction Y; thickness direction Z. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0033] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0034] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0035] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0036] In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] Please refer to Figures 1 to 3 The embodiment of the present application provides a battery 100, and the battery 100 can be a steel shell battery.

[0038] The battery 100 can have various shapes, for example, the battery 100 can be a square steel shell battery, a cylindrical steel shell battery, or a steel shell battery of other shapes.

[0039] The battery 100 includes a shell 110 and a jelly-roll cell 130.

[0040] The shell 110 includes a positive electrode connecting portion 1111 and a negative electrode connecting portion 1131 which are insulated, and is provided with a receiving space 115.

[0041] As an example, the receiving space 115 can be provided in the shell 110, and the shell wall of the shell 110 can be provided with the positive electrode connecting portion 1111 and the negative electrode connecting portion 1131 which are insulated.

[0042] The jelly-roll cell 130 is arranged in the receiving space 115, and the receiving space 115 can also be used to accommodate electrolyte to soak the cell body 131.

[0043] The jelly-roll cell 130 includes a cell body 131, a positive electrode tab 133, and a negative electrode tab 135, the positive electrode tab 133 is electrically connected to the cell body 131 and the positive electrode connecting portion 1111, the negative electrode tab 135 is electrically connected to the cell body 131 and the negative electrode connecting portion 1131, and the positive electrode connecting portion 1111 and the negative electrode connecting portion 1131 can be used as positive and negative electrode contacts for electrical connection with external electrical devices.

[0044] The number of at least one of the positive electrode tab 133 and the negative electrode tab 135 is two, two positive electrode tabs 133 are connected to different sides of the cell body 131, and / or two negative electrode tabs 135 are connected to different sides of the cell body 131, so that the current can enter the cell body 131 from the two positive electrode tabs 133 or the two negative electrode tabs 135 on different sides of the cell body 131, thereby shortening the transmission distance of the current on the cell body 131, helping the current to be transmitted more quickly to various positions of the cell body 131, improving the charge-discharge rate of the battery 100, and improving the electrical performance of the battery 100.

[0045] As an example, the jelly-roll 130 can include two positive tabs 133, which can be connected to different sides of the jelly-roll body 131. The negative tab 135 can be connected to the same side of the jelly-roll body 131 as the positive tabs 133, or the negative tab 135 can be connected to a different side of the jelly-roll body 131 than the positive tabs 133. Both of the positive tabs 133 can be electrically connected to the positive connection portion 1111, and the negative tab 135 can be electrically connected to the negative connection portion 1131. Both of the positive tabs 133 can provide a path for current to enter the jelly-roll body 131 (i.e., the positive jelly-roll body 131) from different sides of the jelly-roll body 131, so that the current can be transmitted to various locations of the jelly-roll body 131 more quickly, improving the charge-discharge rate of the battery 100.

[0046] As another example, the jelly-roll 130 can include two negative tabs 135 and one positive tab 133, which can be connected to different sides of the jelly-roll body 131. The positive tab 133 can be connected to the same side of the jelly-roll body 131 as the negative tabs 135, or the positive tab 133 can be connected to a different side of the jelly-roll body 131 than the negative tabs 135. Both of the negative tabs 135 can be electrically connected to the negative connection portion 1131, and the positive tab 133 can be electrically connected to the positive connection portion 1111. Both of the negative tabs 135 can provide a path for current to enter the jelly-roll body 131 (i.e., the negative jelly-roll body 131) from different sides of the jelly-roll body 131, so that the current can be transmitted to various locations of the jelly-roll body 131 more quickly, improving the charge-discharge rate of the battery 100.

[0047] As another example, the jelly-roll 130 can include two positive tabs 133 and two negative tabs 135, which can be connected to different sides of the jelly-roll body 131. The negative tabs 135 can be connected to the same side of the jelly-roll body 131 as the positive tabs 133, or the negative tabs 135 can be connected to a different side of the jelly-roll body 131 than the positive tabs 133. Both of the positive tabs 133 can be electrically connected to the positive connection portion 1111, and both of the negative tabs 135 can be electrically connected to the negative connection portion 1131. Both of the positive tabs 133 and both of the negative tabs 135 can provide a path for current to enter the jelly-roll body 131 (i.e., the positive jelly-roll body 131 and the negative jelly-roll body 131) from different sides of the jelly-roll body 131, so that the current can be transmitted to various locations of the jelly-roll body 131 more quickly, further improving the charge-discharge rate of the battery 100.

[0048] In some embodiments, the positive tabs 133 and the negative tabs 135 can be connected to different sides of the jelly-roll body 131, so that the positive tabs 133 and the negative tabs 135 can be better arranged at the connection locations of the jelly-roll body 131 to further improve the charge-discharge rate of the battery 100.

[0049] As an example, the cell body 131 is substantially in a square structure, and the positive tab 133 and the negative tab 135 can be connected to different sides of the cell body 131. The positive tab 133 can be connected to the center of the side of the cell body 131 to which the corresponding positive tab 133 is connected, so that the distance from the positive tab 133 to other sides of the cell body 131 is shorter, which helps to shorten the transmission distance of the current to other sides of the cell body 131, so that the current can reach the positions of the cell body 131 more quickly, further improving the charge-discharge rate of the battery 100.

[0050] Similarly, the negative tab 135 can be connected to the center of the side of the cell body 131 to which the corresponding negative tab 135 is connected, so that the distance from the negative tab 135 to other sides of the cell body 131 is shorter, which helps to shorten the transmission distance of the current to other sides of the cell body 131, so that the current can reach the positions of the cell body 131 more quickly, further improving the charge-discharge rate of the battery 100.

[0051] It should be noted that the width of the positive tab 133 can be smaller than the width of the side of the cell body 131 to which the corresponding positive tab 133 is connected, and the width of the negative tab 135 can be smaller than the width of the side of the cell body 131 to which the corresponding negative tab 135 is connected.

[0052] In some embodiments, the cell body 131 can have a length direction X and a width direction Y, and the length dimension of the cell body 131 can be greater than the width dimension of the cell body 131.

[0053] As an example, the cell body 131 is substantially in a rectangular structure, and the extension direction of the long side of the cell body 131 is substantially the length direction X, and the extension direction of the short side of the cell body 131 is substantially the width direction Y.

[0054] It can be understood that in the present embodiment, the cell body 131 can also adopt other shapes, for example, the cell body 131 can also adopt an elliptical structure, and the major axis direction of the cell body 131 is substantially the length direction X, and the minor axis direction of the cell body 131 is substantially the width direction Y.

[0055] The two positive tabs 133 can be connected to opposite sides of the cell body 131 along the width direction Y, and / or the two negative tabs 135 can be connected to opposite sides of the cell body 131 along the length direction X, so that the position distribution of each tab (i.e., the positive tab 133 and the negative tab 135) on the cell body 131 can be optimized, and each tab can be distributed at the center of the side of the cell body 131 to which the corresponding tab is connected, which helps to further shorten the transmission distance of the current to other sides of the cell body 131, further improving the charge-discharge rate of the battery 100.

[0056] It can be understood that in other embodiments, two positive tabs 133 can also be connected to opposite sides of the battery body 131 along the length direction X, and / or two negative tabs 135 are connected to opposite sides of the battery body 131 along the width direction Y.

[0057] In some embodiments, the battery body 131 can include a first side 1311, a second side 1313, a third side 1315, and a fourth side 1317. The first side 1311 and the third side 1315 can be opposite, and the second side 1313 and the fourth side 1317 can be opposite.

[0058] As an example, the battery body 131 is generally square in structure, and the first side 1311, the second side 1313, the third side 1315, and the fourth side 1317 can be sequentially connected end to end to form the four sides of the battery body 131. In this example, the square structure can be a square structure, a rectangular structure, or other quadrilateral structure.

[0059] It should be noted that in this embodiment, the battery body 131 can also have other shapes other than a square structure, and the battery body 131 can also have a fifth side, a sixth side, a seventh side, and so on.

[0060] In the jelly-roll battery 130, the number of positive tabs 133 can be two, and the number of negative tabs 135 can also be two. The two positive tabs 133 are defined as a first positive tab 1331 and a second positive tab 1333, and the two negative tabs 135 are defined as a first negative tab 1351 and a second negative tab 1353.

[0061] The first positive tab 1331 can be connected to the first side 1311, the first negative tab 1351 can be connected to the second side 1313, the second positive tab 1333 can be connected to the third side 1315, and the second negative tab 1353 can be connected to the fourth side 1317. Thus, the four tabs (i.e., the first positive tab 1331, the second positive tab 1333, the first negative tab 1351, and the second negative tab 1353) can be distributed on the four sides (i.e., the first side 1311, the second side 1313, the third side 1315, and the fourth side 1317) of the battery body 131. Each tab can be distributed at the center of the side of the battery body 131 to which the corresponding tab is connected, which helps to further shorten the transmission distance of the current to other sides of the battery body 131, and further improves the charge-discharge rate of the battery 100.

[0062] In some embodiments, the two positive tabs 133 can be symmetrically connected to opposite sides of the cell body 131, so as to shorten the distance between the two positive tabs 133, and help the current to be transmitted to the middle position of the cell body 131 between the two positive tabs 133 and the left and right sides of the arrangement direction of the two positive tabs 133, so as to improve the charge-discharge rate of the battery 100.

[0063] As an example, the two positive tabs 133 can be symmetrically connected to opposite sides of the cell body 131, and respectively connected to the center position of the side of the cell body 131 connected with the corresponding positive tab 133.

[0064] In some embodiments, the two negative tabs 135 can be symmetrically connected to opposite sides of the cell body 131, so as to shorten the distance between the two negative tabs 135, and help the current to be transmitted to the middle position of the cell body 131 between the two negative tabs 135 and the left and right sides of the arrangement direction of the two negative tabs 135, so as to improve the charge-discharge rate of the battery 100.

[0065] As an example, the two negative tabs 135 can be symmetrically connected to opposite sides of the cell body 131, and respectively connected to the center position of the side of the cell body 131 connected with the corresponding negative tab 135.

[0066] Please refer to Figures 1 to 2 In some embodiments, the laminated cell 130 can include a plurality of positive sheets 137, a plurality of negative sheets 139, and a plurality of separators (not shown in the figure).

[0067] As shown in Figure 4 The positive sheet 137 can include a first current collecting area 1371 and a first empty foil area 1373 connected with each other, and the negative sheet 139 can include a second current collecting area 1391 and a second empty foil area 1393 connected with each other.

[0068] As an example, the positive sheet 137 can include a first base material layer and a first active material coating layer, the first base material layer can include a first empty foil area 1373 and a first coating area, and the first empty foil area 1373 can extend outward from the side edge of the first coating area. The first active material coating layer can be coated on the opposite surfaces of the first coating area to connect with the first coating area to form the first current collecting area 1371.

[0069] Similarly, as shown in Figure 5As shown, the negative tab 139 can include a second substrate layer and a second active material coating layer, the second substrate layer can include a second empty foil region 1393 and a second coated region, the second empty foil region 1393 can extend outwardly from the side of the second coated region. The second active material coating layer can be coated on the opposite surfaces of the second coated region to form a second current collecting region 1391 in connection with the second coated region.

[0070] Referring to Figures 3 to 5 , the first current collecting regions 1371 and the second current collecting regions 1391 can be alternately stacked, and a separator for electrical isolation can be arranged between adjacent first current collecting regions 1371 and second current collecting regions 1391. The plurality of first current collecting regions 1371, the plurality of separators, and the plurality of second current collecting regions 1391 can be stacked to form the cell body 131.

[0071] It should be noted that the separator can adopt a sheet structure to be stacked between the first current collecting regions 1371 and the second current collecting regions 1391, so that the separator can separate the first current collecting regions 1371 and the second current collecting regions 1391, which helps to avoid short circuit. The separator can also adopt a bag structure, and the first current collecting regions 1371 or the second current collecting regions 1391 can be arranged in the bag of the separator. The bag structure of the separator can also separate the first current collecting regions 1371 and the second current collecting regions 1391, which helps to avoid short circuit.

[0072] Referring to Figures 1 to 3 , on opposite sides of the jelly-roll cell 130 along the thickness direction Z (i.e., the stacking direction of the jelly-roll cell 130), a separator or an insulating tape or other insulating structure can be arranged between the tab (the positive tab 137 or the negative tab 139) and the shell 110 to separate the tab and the shell 110.

[0073] Referring to Figures 3 to 5 , the plurality of first empty foil regions 1373 can be sequentially stacked to form a positive tab 133, and the plurality of second empty foil regions 1393 can be sequentially stacked to form a negative tab 135.

[0074] Referring to Figure 1 and Figure 4 , in some embodiments, the plurality of first empty foil regions 1373 can be sequentially stacked and welded to form a positive tab 133, which helps to improve the connection strength between the plurality of first empty foil regions 1373.

[0075] Referring to Figure 2 and Figure 5 , similarly, the plurality of second empty foil regions 1393 can be sequentially stacked and welded to form a negative tab 135, which helps to improve the connection strength between the plurality of second empty foil regions 1393.

[0076] Referring to Figures 3 to 5In some embodiments, the laminated cell 130 can further include a first connecting member and a second connecting member,

[0077] The first connecting member can connect the plurality of first empty foil regions 1373 to form one positive tab 133, thereby eliminating the need for welding the plurality of first empty foil regions 1373 and reducing the risk of poor contact between the plurality of first empty foil regions 1373 due to empty welding.

[0078] The first connecting member can be in a conductive structure, such as a metal conductor, and can directly electrically connect the plurality of first empty foil regions 1373.

[0079] As an example, the first connecting member can be in a conductive structure such as a rivet or a screw, and can be inserted into the plurality of first empty foil regions 1373 along the stacking direction of the plurality of first empty foil regions 1373 to electrically connect the plurality of first empty foil regions 1373.

[0080] The first connecting member can also be in an insulating structure to press the plurality of first empty foil regions 1373 together to form an electrical connection.

[0081] As an example, the first connecting member can be in a connecting ring, and the plurality of first empty foil regions 1373 can be stacked and clamped in the ring to press the plurality of first empty foil regions 1373 together to form an electrical connection. It can be understood that the connecting ring can be in an insulating ring or a conductive ring.

[0082] The second connecting member can be in a conductive structure or an insulating structure, and the specific arrangement and benefits can be referred to the first connecting member, which will not be repeated.

[0083] Please refer to Figure 1 , Figure 3 and Figure 4 In some embodiments, the positive tab 137 can further include a third empty foil region 1375, and the third empty foil region 1375 and the first empty foil region 1373 can be connected to different sides of the first current collecting region 1371. The plurality of third empty foil regions 1375 can be stacked to form another positive tab 133, and the two positive tabs 133 can be connected to different sides of the cell body 131.

[0084] As an example, the plurality of first empty foil regions 1373 can be stacked and connected to form a first positive tab 1331, and the plurality of third empty foil regions 1375 can be stacked to form a second positive tab 1333.

[0085] The connection method of the plurality of third empty foil regions 1375 can be referred to the connection method of the plurality of first empty foil regions 1373 in the above embodiments, which will not be repeated.

[0086] Please refer to Figure 2 ,Figure 3 and Figure 5 In some embodiments, the negative tab 139 can further include fourth hollow foil regions 1395, the fourth hollow foil regions 1395 and the second hollow foil regions 1393 can be connected to different sides of the second current collecting region 1391, and the plurality of fourth hollow foil regions 1395 are sequentially stacked to form another negative tab 135, so that the two negative tabs 135 can be connected to different sides of the battery body 131.

[0087] As an example, the plurality of second hollow foil regions 1393 can be connected to form the first negative tab 1351, and the plurality of fourth hollow foil regions 1395 can be stacked to form the second negative tab 1353.

[0088] The connection mode of the plurality of fourth hollow foil regions 1395 can refer to the connection mode of the plurality of second hollow foil regions 1393 in the above-mentioned embodiments, and will not be described again.

[0089] Please refer to Figures 1 to 2 In some embodiments, the shell 110 can further include a positive shell 111 and a negative shell 113, the positive shell 111 and the negative shell 113 can be insulatively connected and enclose the accommodation space 115.

[0090] The positive shell 111 and the negative shell 113 can have various arrangements.

[0091] As an example, the positive shell 111 can include a first connecting end and a first annular side, the first connecting end can be connected to one end of the first annular side to enclose the space inside the ring of the first annular side to form a first space. The first connecting end and the first annular side can be integrally formed. The negative shell 113 can include a second connecting end and a second annular side, the second connecting end can be connected to one end of the second annular side to enclose the space inside the ring of the second annular side to form a second space. The second connecting end and the second annular side can be integrally formed.

[0092] The end of the first annular side away from the first connecting end can be insulatively connected to the end of the second annular side away from the second connecting end, so that the first space and the second space are in communication to form the accommodation space 115. The shell 110 can further include an insulating glue, the insulating glue can be arranged between the first annular side and the second annular side to fix the first annular side and the second annular side, and insulate the first annular side and the second annular side, and can also seal the gap between the first annular side and the second annular side.

[0093] As another example, the positive shell 111 can include a first connecting end portion and a first annular side portion, the first connecting end portion can be connected to one end of the first annular side portion, and the negative shell 113 can be arranged on the other end of the first annular side portion away from the first connecting end portion, so that the first connecting end portion, the first annular side portion and the negative shell 113 can form the accommodation space 115 in the annular space of the first annular side portion. An insulating adhesive can be arranged between the first annular side portion and the negative shell to form an insulating and sealing connection.

[0094] It can be understood that in the present example, the negative shell 113 can also include a second connecting end portion and a second annular side portion, and the positive shell 111 can be arranged on the other end of the second annular side portion away from the second connecting end portion, which will not be described herein.

[0095] The positive shell 111 and / or the negative shell 113 can be a rigid shell to better accommodate the stacked electrode cells 130 in the accommodation space 115.

[0096] The rigid shell can refer to a shell that is not easy to deform or bend under stress, for example, the rigid shell can be a metal shell such as a stainless steel shell or other metal shell.

[0097] The positive connecting portion 1111 is located in the positive shell 111, and the negative connecting portion 1131 is located in the negative shell 113, so that the insulating adhesive can insulate the positive connecting portion 1111 and the negative connecting portion 1131.

[0098] It should be noted that the positive shell 111 can be made of a conductive material such as stainless steel, so the entire positive shell 111 can serve as the positive connecting portion 1111. Alternatively, the positive shell 111 can include an insulating shell and a conductive structure connected to each other, the insulating shell can be connected to the negative shell 113, and the conductive structure can serve as the positive connecting portion 1111. The arrangement of the negative shell 113 can refer to the positive shell 111, which will not be described herein.

[0099] In some embodiments, the positive tab 133 can be directly electrically connected to the positive connecting portion 1111, and the negative tab 135 can be directly electrically connected to the negative connecting portion 1131.

[0100] As an example, the positive tab 133 can be welded to the positive connecting portion 1111, and the negative tab 135 can be welded to the negative connecting portion 1131.

[0101] In some embodiments, the battery 100 can further include positive electrode conductive pieces 150, the positive electrode conductive pieces 150 and the positive electrode tabs 133 can be one-to-one corresponding, and the positive electrode conductive pieces 150 can electrically connect the positive electrode tabs 133 and the positive electrode connecting portion 1111. In this way, each of the positive electrode tabs 133 can be electrically connected to the positive electrode connecting portion through one positive electrode conductive piece 150, which can help to avoid bending of the positive electrode tabs 133, and thus can more conveniently electrically connect the positive electrode tabs 133 to the positive electrode connecting portion 1111.

[0102] The positive electrode conductive pieces 150 can be rigid structures or flexible structures.

[0103] As an example, the positive electrode conductive pieces 150 can be rigid structures, and the shapes of the positive electrode conductive pieces 150 can be pre-set to facilitate electrical connection to the positive electrode tabs 133 and the positive electrode connecting portion 1111. For example, the positive electrode conductive pieces 150 can include first and second connecting portions connected at an angle, the first connecting portion can be welded to the positive electrode tab 133, and the second connecting portion can be welded to the positive electrode connecting portion 1111, so that the positive electrode conductive piece 150 can be arranged in a bent structure without bending the positive electrode tab 133.

[0104] It should be noted that the positive electrode conductive pieces 150 can further include third and fourth connecting portions, etc., so that the positive electrode conductive pieces 150 can more conveniently electrically connect the positive electrode tabs 133 and the positive electrode connecting portion 1111.

[0105] As another example, the positive electrode conductive pieces 150 can be flexible structures, so that the positive electrode conductive pieces 150 can be bent into a desired shape to more conveniently electrically connect the positive electrode tabs 133 and the positive electrode connecting portion 1111. For example, the positive electrode conductive pieces can be copper wires or other conductive wires.

[0106] In some embodiments, the battery 100 can further include negative electrode conductive pieces 170, the negative electrode conductive pieces 170 and the negative electrode tabs 135 can be one-to-one corresponding, and the negative electrode conductive pieces 170 can electrically connect the negative electrode tabs 135 and the negative electrode connecting portion 1131. In this way, each of the negative electrode tabs 135 can be electrically connected to the negative electrode connecting portion through one negative electrode conductive piece 170, which can help to avoid bending of the negative electrode tabs 135, and thus can more conveniently electrically connect the negative electrode tabs 135 to the negative electrode connecting portion 1131.

[0107] The negative electrode conductive pieces 170 can also be rigid structures or flexible structures, and specific details can be referred to the above-described positive electrode conductive pieces 150.

[0108] The battery 100 provided by the embodiment of the present application sets the number of at least one of the positive pole ears 133 and the negative pole ears 135 of the laminated battery cell 130 to two, the two positive pole ears 133 are connected to different sides of the cell body 131 and / or the two negative pole ears 135 are connected to different sides of the cell body 131, so that the current can enter the cell body 131 from the two positive pole ears 133 or the two negative pole ears 135 on different sides of the cell body 131, which helps to shorten the transmission distance of the current on the cell body 131, the current can be transmitted to the positions of the cell body 131 more quickly, and the charge-discharge rate of the battery 100 is improved.

[0109] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized by, The shell comprises a positive electrode connecting part and a negative electrode connecting part arranged in an insulating manner, and is provided with a containing space; and The laminated battery cell is arranged in the containing space and comprises a battery cell body, a positive electrode tab and a negative electrode tab; the positive electrode tab is electrically connected to the battery cell body and the positive electrode connecting part, and the negative electrode tab is electrically connected to the battery cell body and the negative electrode connecting part; At least one of the positive electrode tab and the negative electrode tab has two numbers, two positive electrode tabs are connected to different sides of the battery cell body, and / or two negative electrode tabs are connected to different sides of the battery cell body. The positive electrode tab and the negative electrode tab are connected to different sides of the battery cell body.

2. The battery of claim 1, wherein, The battery cell body has a length direction and a width direction, and the length dimension of the battery cell body is greater than the width dimension of the battery cell body; 3. The battery of claim 2, wherein, Two positive electrode tabs are connected to opposite sides of the battery cell body along the width direction, and / or two negative electrode tabs are connected to opposite sides of the battery cell body along the length direction. The battery cell body comprises a first side, a second side, a third side and a fourth side, the first side and the third side are opposite, and the second side and the fourth side are opposite; 4. The battery of claim 2, wherein, The number of positive electrode tabs is two, and two positive electrode tabs are defined as a first positive electrode tab and a second positive electrode tab; the number of negative electrode tabs is two, and two negative electrode tabs are defined as a first negative electrode tab and a second negative electrode tab; The first positive electrode tab is connected to the first side, the first negative electrode tab is connected to the second side, the second positive electrode tab is connected to the third side, and the second negative electrode tab is connected to the fourth side. Two positive electrode tabs are symmetrically connected to opposite sides of the battery cell body, and / or two negative electrode tabs are symmetrically connected to opposite sides of the battery cell body.

5. The battery according to any one of claims 2 to 4, characterized in that, The laminated battery cell comprises a plurality of positive electrode sheets, a plurality of negative electrode sheets and a plurality of separators, the positive electrode sheet comprises a first current collecting area and a first empty foil area connected to each other, and the negative electrode sheet comprises a second current collecting area and a second empty foil area connected to each other; 6. The battery according to any one of claims 1 to 4, characterized in that, The first current collecting area and the second current collecting area are alternately stacked, and the adjacent first current collecting area and the second current collecting area are provided with the separator for electrical isolation; a plurality of first current collecting areas, a plurality of separators and a plurality of second current collecting areas are stacked to form the battery cell body; A plurality of first empty foil areas are sequentially stacked to form a positive electrode tab, and a plurality of second empty foil areas are sequentially stacked to form a negative electrode tab. A plurality of first empty foil areas are sequentially stacked to form a positive electrode tab, and a plurality of second empty foil areas are sequentially stacked to form a negative electrode tab.

7. The battery of claim 6, wherein, Alternatively, the laminated battery cell further comprises a first connecting piece and a second connecting piece, the first connecting piece connects a plurality of first empty foil areas to connect a plurality of first empty foil areas to form a positive electrode tab; and the second connecting piece connects a plurality of second empty foil areas to connect a plurality of second empty foil areas to form a negative electrode tab. ​ 8. The battery of claim 6, wherein, The positive plate further comprises third empty foil regions, the third empty foil regions and the first empty foil regions are connected to different sides of the first current collecting region, and a plurality of the third empty foil regions are sequentially stacked to form another positive tab; And / or, the negative plate further comprises fourth empty foil regions, the fourth empty foil regions and the second empty foil regions are connected to different sides of the second current collecting region, and a plurality of the fourth empty foil regions are sequentially stacked to form another negative tab.

9. The battery according to any one of claims 1 to 4, characterized in that, The shell comprises a positive shell and a negative shell, the positive shell and the negative shell are insulated and connected, and enclose the accommodation space; The positive shell and / or the negative shell is a rigid shell, the positive connecting part is located in the positive shell, and the negative connecting part is located in the negative shell.

10. The battery according to any one of claims 1 to 4, characterized in that, The battery further comprises positive conductive parts, the positive conductive parts and the positive tabs correspond one by one, and the positive conductive parts electrically connect the positive tabs and the positive connecting part; And / or, the battery further comprises negative conductive parts, the negative conductive parts and the negative tabs correspond one by one, and the negative conductive parts electrically connect the negative tabs and the negative connecting part.

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