Battery monomer, battery device and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell, a plurality of first pole columns and an electrode assembly, and the first pole columns are all mounted on the shell; the electrode assembly is arranged in the shell, the electrode assembly comprises a body part and first tabs arranged on the body part, the number of the first tabs is smaller than that of the first pole columns, and at least one first tab is connected with at least two first pole columns. According to the battery monomer provided by the invention, the at least one first tab is connected with the plurality of first poles, so that the current flowing through the first tab is shunted to the corresponding plurality of first poles, and the temperature rise speed of the plurality of first poles is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to a battery monomer, a battery device, and a power consumption device. BACKGROUND

[0002] With the increasing emphasis on environmental protection, new energy vehicles have rapidly risen in the vehicle industry due to their energy-saving and environmentally-friendly advantages. New energy vehicles use batteries as power supply equipment. The battery includes a shell, an electrode assembly is arranged in the shell, the electrode assembly is provided with a tab, the shell is provided with a pole, and the pole is connected with the tab. With the demand for high energy density of the battery, the thickness of the tab is gradually reduced, which leads to a relatively fast temperature rise speed of the pole, thereby increasing the risk of thermal runaway of the battery. UTILITY MODEL CONTENT

[0003] The purpose of the embodiments of the present application is to provide a battery monomer, which aims to solve the technical problem of a fast temperature rise speed of a pole of a battery monomer in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0005] In a first aspect, a battery monomer is provided, comprising:

[0006] a shell;

[0007] a plurality of first poles, each of the plurality of first poles being mounted on the shell;

[0008] an electrode assembly arranged in the shell, the electrode assembly comprising a body portion and a first tab arranged on the body portion, the number of the first tabs being less than the number of the first poles, and at least one first tab being connected with at least two first poles.

[0009] In the battery monomer provided by the embodiments of the present application, since the number of the first tabs is less than the number of the first poles, at least one first tab is connected with at least two first poles. At the first tab connecting the at least two first poles, the current flowing through the first tab is distributed to the plurality of first poles, so that the current density borne by each first pole is reduced, thereby reducing the heat generated by the current passing through the first pole in the same time period, i.e. reducing the temperature rise speed of the first pole, and reducing the risk of thermal runaway of the battery monomer.

[0010] In a possible design, the body portion has a first end face, the first tab protrudes from the first end face in a first direction, in a second direction, the maximum dimension of the first tab is L1, the dimension of the body portion is L2, 0.1≤L1 / L2≤1, and the second direction is perpendicular to the first direction.

[0011] In this configuration, in the second direction, the maximum size of the first electrode is greater than or equal to 0.1 times the size of the main body, thereby increasing the cross-sectional area of ​​the first electrode and thus increasing the current carrying capacity of the first electrode.

[0012] In one possible design, 0.5 ≤ L1 / L2 ≤ 1.

[0013] In this configuration, the maximum dimension of the first electrode in the second direction is greater than or equal to 0.5 times the dimension of the main body, thereby making the cross-sectional area of ​​the first electrode larger and further improving the current carrying capacity of the first electrode.

[0014] In one possible design, in the first direction, the first electrode protrudes from the first end face by a dimension of H1, where 0.2≤H1 / L1≤0.9.

[0015] In this configuration, since 0.2≤H1 / L1, the first electrode tab has sufficient welding space. Since H1 / L1≤0.9, the size redundancy of the first electrode tab can be reduced, thereby reducing the space occupied by the first electrode tab in the housing.

[0016] In one possible design, 0.5 ≤ H1 / L1 ≤ 0.8.

[0017] In this configuration, since 0.5≤H1 / L1, the first electrode tab has sufficient welding space, which facilitates the connection operation between the first electrode tab and the first electrode post; since H1 / L1≤0.8, the deformation of the first electrode tab is reduced to a certain extent, thereby reducing the probability of the first electrode tab excessively compressing the body part.

[0018] In one possible design, the battery cell also includes a first adapter piece, which includes a first connection area and a second connection area. The first connection area is connected to the first electrode tab, and the number of second connection areas is the same as the number of first electrode posts. The second connection areas are connected to the first electrode posts in a one-to-one correspondence.

[0019] In this configuration, the first tab and the first pole are connected by a first adapter piece, which reduces the difficulty of connection operation and improves production efficiency.

[0020] In one possible design, a first tab connects two first pole posts, and a first adapter includes a first connection area and two second connection areas, with the first connection area located between the two second connection areas.

[0021] In this configuration, since the first connection area is located between the two second connection areas, the second connection area is located at the edge of the first adapter piece, which facilitates the connection operation between the second connection area and the first pole.

[0022] In a possible design, the body part is provided with a first tab, the first tab is centrally arranged on the body part in the second direction; and a plurality of first poles are arranged at intervals and symmetrically relative to a central section perpendicular to the second direction.

[0023] In this arrangement, the first tab is centrally arranged on the body part, which can improve the current distribution uniformity of the body part. The plurality of first poles are symmetrically arranged, so that the current can flow more uniformly from the first tab into each first pole, reducing the risk of excessively high local current density.

[0024] In a possible design, the battery monomer further includes a second pole, the body part is provided with a second tab, the second tab is opposite in polarity to the first tab, and the second tab is connected to the second pole.

[0025] In this arrangement, the battery monomer forms a current loop through the first tab, the first pole, the second tab, and the second pole.

[0026] In a possible design, the shell has a first wall and a second wall, the first pole is mounted on the first wall, the second pole is mounted on the second wall, the first tab is arranged at one end of the body part opposite the first wall, and the second tab is arranged at one end of the body part opposite the second wall.

[0027] In this arrangement, the distance between the first tab and the first pole is relatively short, and the distance between the second tab and the second pole is relatively short, facilitating the connection between the first tab and the first pole and the connection between the second tab and the second pole.

[0028] In a possible design, the number of second poles is a plurality, and at least one second tab is connected to at least two second poles.

[0029] In this arrangement, the current of at least one second tab is shunted to at least two second poles, so that the current density borne by each second pole is reduced, thereby reducing the heat generated by the current passing through each second pole in the same time period, i.e., reducing the temperature rise speed of each second pole, and reducing the risk of thermal runaway of the battery monomer.

[0030] In a possible design, the shell includes a shell body and an end cover, the end cover covers an opening of the shell body, and the plurality of first poles are arranged on the end cover.

[0031] In this arrangement, the first poles are arranged on the end cover, and the end cover and the shell body are independent structures, so the installation of the first poles can be performed before the end cover is mounted on the shell, facilitating the installation of the first poles.

[0032] In a second aspect, a battery device is provided, comprising a plurality of the battery cell provided in the first aspect.

[0033] Since the battery device comprises the battery cell, at least all the advantages of the battery cell are provided, which will not be repeated here.

[0034] In a third aspect, a power consuming device is provided, comprising the battery device provided in the second aspect.

[0035] Since the power consuming device comprises the battery device, at least all the advantages of the battery device are provided, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0037] Figure 1 is a structural schematic diagram of the battery cell provided by the embodiments of the present application;

[0038] Figure 2 is an exploded view of the battery cell provided by the embodiments of the present application;

[0039] Figure 3 is a partial schematic diagram of another exploded view of the battery cell provided by the embodiments of the present application;

[0040] Figure 4 is a partial schematic diagram of another exploded view of the battery cell provided by the embodiments of the present application;

[0041] Figure 5 is a structural schematic diagram of the first adapter provided by the embodiments of the present application;

[0042] Figure 6 is a structural schematic diagram of the first pole provided by the embodiments of the present application;

[0043] Figure 7 is a structural schematic diagram of another first pole provided by the embodiments of the present application;

[0044] Figure 8 is a distribution schematic diagram of the first pole on the first wall provided by the embodiments of the present application;

[0045] Figure 9 is another distribution schematic diagram of the first pole on the first wall provided by the embodiments of the present application;

[0046] Figure 10is a schematic view of relative position relationship of an electrode assembly, a first wall and a second wall provided by an embodiment of the present application;

[0047] Figure 11 is a schematic view of relative position relationship of an electrode assembly, a first wall and a second wall provided by another embodiment of the present application;

[0048] Figure 12 is a schematic view of relative position relationship of an electrode assembly, a first wall and a second wall provided by yet another embodiment of the present application;

[0049] Figure 13 is an exploded view of a battery device provided by an embodiment of the present application;

[0050] Figure 14 is a structural schematic view of an electric device provided by an embodiment of the present application.

[0051] The label details involved in the above-mentioned drawings are as follows:

[0052] 1 - battery monomer; 11 - shell; 111 - first wall; 112 - inner cavity; 113 - end cover; 114 - housing; 115 - second wall; 12 - first pole column; 13 - electrode assembly; 131 - body part; 1311 - first pole piece; 132 - first pole lug; 133 - second pole lug; 14 - first adapter piece; 141 - first connecting area; 142 - second connecting area; 15 - second pole column; 16 - second adapter piece; 161 - third connecting area; 162 - fourth connecting area;

[0053] 21 - battery device; 211 - battery monomer assembly; 212 - box body; 2121 - first box body; 2122 - second box body; 22 - control mechanism; 23 - driving mechanism. DETAILED DESCRIPTION

[0054] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0055] In the description of embodiments of the present application, the term "a plurality of" refers to two or more (including two).

[0056] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] It should be understood that the orientations or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structures or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0058] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0059] With the gradual enhancement of people's environmental protection consciousness, the new energy industry is rapidly rising, providing a broad space for the application and development of battery devices. The battery device includes a battery monomer, the battery monomer includes a shell and an electrode assembly, the shell is provided with a pole, and the electrode assembly is provided with a tab, and the tab is electrically connected with the pole. In some cases, the pole has the problem of fast temperature rise speed (referred to as temperature rise). Factors such as the battery being in a large current charging and discharging state, poor heat dissipation, and the thickness of the tab being thinned will cause the pole to have a fast temperature rise. Exemplarily, with the further increase of the demand for the energy density of the battery device, the thickness of the tab is further reduced, for example, a copper foil with a thickness of 5 μm or 4.5 μm is used to make the tab of the negative electrode, which reduces the cross-sectional area of the tab and increases the resistance. According to the deformation formula Q = I 2 × R of the Joule law, where Q represents heat, I represents current, and R represents resistance, it can be known from the above heat formula that in the case of constant current, the greater the resistance, the higher the heat, that is, the use of thinner tabs will cause the heat to rise, and in addition, the thinner the tab, the smaller the heat dissipation area, which will also cause the temperature of the pole connected with the tab to rise.

[0060] Based on the above considerations, in order to solve the above problem of fast temperature rise of the pole, the application provides a battery monomer. The battery monomer comprises a tab and a pole, and at least one tab is connected to a plurality of poles. Since the current flows through one tab to a plurality of poles, the current density on each pole decreases, that is, the heat generated by the current passing through the pole in the same time period is reduced, thereby reducing the temperature rise speed of the pole and reducing the risk of thermal runaway of the battery monomer.

[0061] The battery monomer provided by the application will be explained in detail below.

[0062] In the present embodiment, the length direction is the same direction as the length direction of the battery monomer, the width direction is the same direction as the width direction of the battery monomer, and the height direction is the same direction as the height direction of the battery monomer. As shown in Figure 1 The length direction of the battery monomer 1 is the X direction, the width direction is the Y direction, and the height direction is the Z direction.

[0063] As shown in Figure 1 and Figure 2 The battery monomer 1 provided by the application comprises an outer shell 11, an electrode assembly 13 and a plurality of first poles 12, the plurality of first poles 12 are mounted on the outer shell 11, the electrode assembly 13 is arranged in the outer shell 11, the electrode assembly 13 comprises a body part 131 and a first tab 132 arranged on the body part 131, the number of the first tabs 132 is less than the number of the first poles 12, and at least one first tab is connected to at least two first poles 12.

[0064] In the present embodiment, the battery monomer 1 can be a secondary battery, which refers to a battery monomer 1 that can be activated by charging after discharging to continue to be used.

[0065] The battery monomer 1 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The present application is not limited thereto.

[0066] The battery monomer 1 can be a cylindrical battery monomer 1, a prismatic battery monomer 1, a soft package battery monomer 1 or other shaped battery monomer 1, the prismatic battery monomer 1 comprises a square shell battery monomer 1, a blade-shaped battery monomer, a multi-prismatic battery, for example, a hexagonal prism battery, etc.

[0067] The shell 11 is configured to provide an inner cavity 112, which is configured to accommodate at least the electrode assembly 13. The shell 11 can have various structural shapes, such as a cylindrical shape, a prismatic shape, etc. For example, the shell 11 can have a cuboid shape. The first pole 12 can be arranged on a first wall 111 of the shell 11, which can be any one of the wall panels of the shell 11. For example, when the shell 11 has a cuboid shape, the shell 11 has six wall panels, including two end wall panels arranged in the height direction of the battery cell 1, and four side wall panels connected between the two end wall panels. The first wall 111 can be one of the end wall panels or one of the side wall panels.

[0068] The electrode assembly 13 includes a positive electrode sheet, a negative electrode sheet, and a separator film arranged between the positive electrode and the negative electrode to prevent short circuiting between the positive electrode and the negative electrode. The type of the separator film is not particularly limited in the embodiments of the present application, and any known porous separator film having good chemical stability and mechanical stability can be used. The positive electrode sheet includes a positive electrode main body and a positive electrode tab, and the negative electrode sheet includes a negative electrode main body and a negative electrode tab. The positive electrode main body is at least partially coated with a positive electrode active material, and the negative electrode main body is at least partially coated with a negative electrode active material.

[0069] The main body 131 includes the positive electrode main body, the negative electrode main body, and the separator film. The first tab 132 can be a positive electrode tab, or the first tab 132 can be a negative electrode tab. When the number of the first tabs 132 is plural, all the first tabs 132 are tabs of the same polarity.

[0070] In some embodiments, the material of the positive electrode main body can be aluminum, and the material of the negative electrode main body can be copper.

[0071] In some embodiments, the battery cell 1 further includes an electrolyte, which functions to conduct ions between the positive electrode sheet and the negative electrode sheet. The type of the electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0072] In some embodiments, the main body 131 has a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0073] In other embodiments, the main body 131 has a stack structure. For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be arranged alternately in layers. For example, a plurality of separator films can be arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0074] The first pole 12 is arranged on the shell 11. When the first tab 132 is a positive electrode tab, the first pole 12 is a positive pole. When the first tab 132 is a negative electrode tab, the first pole 12 is a negative pole.

[0075] The number of the first lugs 132 is at least one, or in other words, the number of the first lugs 132 can be one or more. The number of the first poles 12 is greater than the number of the first lugs 132, and the number of the first poles 12 is at least two. When the number of the first lugs 132 is one, the number of the first poles 12 can be two or more; when the number of the first lugs 132 is two, the number of the first poles 12 can be three or more.

[0076] At least one of the first lugs 132 is connected to at least two of the first poles 12, or in other words, when the number of the first lugs 132 is one, the first lug 132 is connected to a plurality of the first poles 12. When the number of the first lugs 132 is a plurality, each of the first lugs 132 can be connected to two or more of the first poles 12, or some of the first lugs 132 are connected to a plurality of the first poles 12, and the rest of the first lugs 132 are connected to one of the first poles 12 one by one. It is worth noting that when the number of the first lugs 132 is a plurality, different first lugs 132 are connected to different first poles 12.

[0077] Taking the number of the first lugs 132 as three and the number of the first poles 12 as six as an example for further illustration. In one example, one of the first lugs 132 is connected to two of the six first poles 12, another of the first lugs 132 is connected to two of the remaining four first poles 12, and the third of the first lugs 132 is connected to the remaining two first poles 12; in this arrangement, there are three first lugs 132 connected to at least two first poles 12. In another example, one of the first lugs 132 is connected to four of the six first poles 12, and the rest of the first poles are connected to the first lugs 132 one by one; in this arrangement, there is one first lug 132 connected to at least two first poles 12. In yet another example, one of the first lugs 132 is connected to three of the six first poles 12, another of the first lugs 132 is connected to two of the remaining three first poles 12, and the third of the first lugs 132 is connected to the remaining one first pole 12; in this arrangement, there are two first lugs 132 connected to at least two first poles 12.

[0078] In the battery monomer 1 provided by the embodiment of the application, the number of the first tabs 132 is less than the number of the first poles 12, at least one first tab 132 is connected with at least two first poles 12, and the current flowing through the first tab 132 is distributed to the at least two first poles 12 at the first tab 132 connected with the at least two first poles 12, so that the current density borne by each of the first poles 12 in the plurality of first poles 12 connected with the first tab 132 is reduced, the heat generated by the current flowing through the first poles 12 in the same time period is reduced, that is, the speed of temperature rise of the first poles is reduced, and the risk of thermal runaway of the battery monomer is reduced.

[0079] As shown in Figure 2 In a possible design, the shell 11 includes a shell body 114 and an end cover 113, the end cover 113 covers the opening of the shell body 114, and the plurality of first poles 12 are arranged on the end cover 113.

[0080] The shell body 114 has an inner cavity 112, and the shell body 114 has an opening that is in communication with the inner cavity 112 and is used for allowing the electrode assembly 13 to enter the inner cavity 112. The end cover 113 covers the opening and is connected with the shell body 114, and the end cover 113 is used for sealing the opening to form a sealed cavity for the inner cavity 112.

[0081] In this arrangement, the plurality of first poles 12 are arranged on the end cover 113, and in the assembly process of the battery monomer 1, the plurality of first poles 12 can be first arranged on the end cover 113, and then the end cover 113 on which the plurality of first poles 12 are arranged is connected with the shell body 114. In this assembly mode, the assembly space of the first poles 12 is relatively larger, the installation of the first poles 12 on the shell 11 is facilitated, and the assembly efficiency of the battery monomer 1 is improved.

[0082] In a possible design, the plurality of first poles 12 form a plurality of first pole assemblies, each first pole assembly includes at least two first poles, the first pole assembly is arranged one by one with the first tab 132, and the first tab 132 is connected with all the first poles 12 in the corresponding first pole assembly. It should be noted that the plurality of first poles 12 form the plurality of first pole assemblies, so as to facilitate the distinction of the first poles 12 connected with different first tabs 132, and the relative position relationship or the connection relationship between the plurality of first poles 12 in the same first pole assembly is not limited.

[0083] In the case that the number of the first tabs 132 is multiple, the multiple first poles 12 form multiple first pole assemblies, one first pole assembly includes two or more first poles 12, and the number of the first poles 12 included in each first pole assembly can be the same or different. For example, in the case that the number of the first poles 12 is nine, the nine first poles can be divided into three groups, i.e., three first pole assemblies, in the case that the three first pole assemblies include the same number of first poles 12, each first pole assembly includes three first poles 12. In the case that the three first pole assemblies include different numbers of first poles 12, one first pole assembly includes two first poles 12, another first pole assembly includes three first poles 12, and the third first pole assembly includes four first poles 12; in another example, one of the first pole assemblies includes five first poles 12, and the other two first pole assemblies each include two first poles 12.

[0084] The number of the first pole assemblies is the same as the number of the first tabs 132, and the first pole assemblies are arranged one by one corresponding to the first tabs 132, and each first tab 132 is connected to all the first poles 12 in the corresponding first pole assembly. For example, in the case that the number of the first tabs 132 is three, the number of the first pole assemblies is three, one first pole assembly includes two first poles 12, another first pole assembly includes three first poles 12, and the third first pole assembly includes four first poles 12, one first tab 132 is connected to two first poles 12 in one first pole assembly, another first tab 132 is connected to three first poles 12 in another first pole assembly, and the third first tab 132 is connected to four first poles 12 in the third first pole assembly. In another example, in the case that the number of the first tabs 132 is three, the number of the first pole assemblies is three, and each first pole assembly includes three first poles 12, each first tab 132 is connected to three first poles 12 in the corresponding first pole assembly.

[0085] One first tab 132 is connected to multiple first poles 12 in the opposite first pole assembly, or in other words, multiple first poles 12 in one first pole assembly are connected to the same first tab 132. For example, in the case that the first tab 132 is a positive tab, all the first poles 12 in the first pole assembly are positive poles, and in the battery monomer 1, the number of the positive tabs is one and the number of the positive poles is multiple, and the multiple positive poles are connected to the same positive tab. In the case that the first tab 132 is a negative tab, the first poles 12 are negative poles, and in the battery monomer 1, the number of the negative tabs is one and the number of the negative poles is multiple, and the multiple negative poles are connected to the same negative tab.

[0086] In this configuration, since there are multiple first terminals 12 connected to each first tab 132, the current of each first tab 132 is diverted to the corresponding multiple first terminals 12, thereby reducing the current density borne by each first terminal 12 in the battery cell 1. This reduces the heat generated by the current passing through each first terminal 12 in the same time period, which in turn reduces the rate of temperature rise of each first terminal 12 and lowers the risk of thermal runaway of the battery cell 1.

[0087] like Figure 3 As shown, in one possible design, the body portion 131 has a first end face, and the first electrode tab 132 protrudes from the first end face in a first direction. In a second direction, the maximum dimension of the first electrode tab 132 is L1, and the dimension of the body portion 131 is L2, where 0.1 ≤ L1 / L2 ≤ 1. The second direction is perpendicular to the first direction. For example, the ratio of the maximum dimension of the first electrode tab 132 in the second direction to the maximum dimension of the body portion 131 in the second direction can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1, etc.

[0088] The first direction can be either the length or width direction of the battery cell 1, and the first end face is one of the two ends of the body portion 131 in the first direction. If the first direction is the length direction of the battery cell 1, the second direction can be the width direction of the battery cell; if the first direction is the width direction of the battery cell 1, the second direction can be the length direction of the battery cell. The first direction is the normal to the first end face. The first tab 132 is typically a sheet-like structure. One end of the first tab 132 is connected to the body portion 131 in the first direction, and the other end extends outward along the first direction to the outside of the body portion 131. The thickness direction of the first tab 132 is perpendicular to the first direction, and the second direction is perpendicular to both the first direction and the thickness direction of the first tab 132. When the first tab 132 is a rectangular sheet-like structure, the area of ​​the cross-section of the first tab 132 is the product of its dimension in the second direction and its dimension in the thickness direction.

[0089] In one specific example, the first direction is the length direction of the battery cell 1, the second direction is the width direction of the battery cell 1, and the first end face is the end face of the body portion 131 at one end in the length direction. In this example, the dimension of the body portion 131 in the second direction can also be referred to as the width of the body portion 131. The maximum dimension of the first tab 132 in the second direction can also be referred to as the width of the first tab 132.

[0090] 0.1≤L1 / L2, i.e. the width of the first tab 132 is equal to or greater than one-tenth of the width of the body portion 131. In this arrangement, the width of the first tab 132 is relatively large. With the thickness of the first tab 132 unchanged, the greater the width of the first tab 132, the greater the cross-section of the first tab 132, thereby increasing the flow area of the first tab 132 to improve the current carrying capacity of the first tab 132.

[0091] L1 / L2≤1, i.e. the width of the first tab 132 is less than or equal to the width of the body portion 131. In this arrangement, the width of the first tab 132 is not greater than the width of the body portion 131, thereby preventing the size of the first tab 132 from being redundant to some extent, thereby reducing the deformation of the first tab 132 due to size redundancy to some extent, thereby reducing the extrusion of the first tab 132 on the body portion 131.

[0092] In one possible design, 0.5≤L1 / L2≤1. The maximum dimension of the first tab 132 in the second direction is equal to or greater than one-half of the dimension of the body portion 131 in the second direction. In the case where the second direction is the width direction of the battery monomer 1, the width of the first tab 132 is equal to or greater than one-half of the width of the body portion 131. Exemplarily, the maximum dimension of the first tab 132 in the second direction is equal to or greater than 0.5, 0.6, 0.7, 0.8, 0.9 or 1 times, etc. of the maximum dimension of the body portion 131 in the second direction. In this arrangement, the maximum dimension of the first tab 132 in the second direction is relatively larger, thereby making the space occupied by the first tab 132 at the end of the body portion 131 relatively larger. Since the space between the end of the body portion 131 and the shell 11 is used to accommodate the first tab 132, the greater the width of the first tab 132, the greater the utilization rate of the space between the end of the body portion 131 and the shell 11. In addition, since the width of the first tab 132 is relatively larger, the heat dissipation area of the first tab 132 is relatively larger, thereby making the heat dissipation effect of the first tab 132 relatively better, which can reduce the risk of local overheating. The increase in the width of the first tab 132 can reduce the resistance of the first tab 132, thereby reducing the heat generation of the first tab 132, thereby making the safety performance of the battery monomer 1 higher. The relatively larger width of the first tab 132 also makes the structural strength of the first tab 132 higher, reducing the risk of breakage of the first tab 132, thereby improving the reliability and durability of the battery monomer 1. The relatively larger width of the first tab 132 makes the area of the first tab 132 for connecting the first pole 12 relatively larger, which facilitates the connection of the first tab 132 to the plurality of first poles 12.

[0093] In a possible design, in the first direction, the first tab 132 protrudes from the first end face by a dimension H1, and 0.2≤H1 / L1≤0.9. Exemplarily, the ratio of the dimension by which the first tab 132 protrudes from the first end face in the first direction to the maximum dimension of the first tab 132 in the second direction can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc.

[0094] The dimension by which the first tab 132 protrudes from the first end face in the first direction is the distance between the end of the first tab 132 away from the body portion 131 in the first direction and the first end face of the body portion 131 when the first tab 132 is not connected to the first pole 12 and the first tab 132 is not bent relative to the body portion 131.

[0095] In an example, the first direction is the length direction of the battery monomer 1, and the dimension by which the first tab 132 protrudes from the first end face in the first direction can also be referred to as the length of the first tab 132. The edges extending in the length direction and the edges extending in the width direction of the first tab 132 define a first surface, and in the assembled battery monomer 1, the first surface is bent and opposite to the first wall 111. The area of the first surface of the first tab 132 is related to the area of the region of the first tab 132 for connecting to the first pole 12. Since the maximum dimension L1 of the first tab 132 in the second direction is related to the dimension L2 of the body portion 131 in the second direction, when the maximum dimension L1 of the first tab 132 in the second direction is unchanged, the smaller the dimension by which the first tab 132 protrudes from the first end face in the first direction, the relatively smaller the area of the region of the first tab 132 for connecting to the first pole 12. 0.2≤H1 / L1 can make the first tab 132 relatively more convenient to connect to the first pole 12. The larger the dimension by which the first tab 132 protrudes from the first end face in the first direction, the relatively larger the region of the end of the body portion 131 covered by the first tab 132 after being bent, but the weight of the first tab 132 will also be relatively larger, and the first tab 132 will have a certain degree of extrusion on the end face of the body portion 131. H1 / L1≤0.9 can reduce the degree of extrusion of the first tab 132 on the body portion 131 and improve the use stability of the battery monomer 1.

[0096] In a possible design, 0.5≤H1 / L1≤0.8. Exemplarily, the ratio of the dimension by which the first tab 132 protrudes from the first end face in the first direction to the maximum dimension in the second direction can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, etc.

[0097] 0.5≤H1 / L1, that is, the dimension of the first tab 132 in the first direction protruding from the first end surface is more than half of the maximum dimension of the first tab 132 in the second direction, so that the first tab 132 has sufficient welding space, facilitating the connection operation between the first tab 132 and the first pole 12. H1 / L1≤0.8, that is, the dimension of the first tab 132 in the first direction is less than 0.8 times the maximum dimension of the first tab 132 in the second direction, so as to reduce the weight of the first tab 132, to a certain extent, to reduce the degree of deformation of the first tab 132 in the direction of the end of the body part 131 after bending, so as to reduce the degree of extrusion of the first tab 132 to the body part 131 to a certain extent.

[0098] The first tab 132 is connected with the first pole 12, and the first tab 132 is electrically connected with the first pole 12, that is, the current can be transmitted between the first tab 132 and the first pole 12. The first tab 132 and the first pole 12 can be directly connected or indirectly connected. In the case of direct connection between the first tab 132 and the first pole 12, the first tab 132 and the first pole 12 can be connected by welding, and specifically can be connected by ultrasonic welding. In the case of indirect connection between the first tab 132 and the first pole 12, as shown in Figure 3 and Figure 4 The battery monomer 1 further comprises a first adapter sheet 14, and the first adapter sheet 14 is connected with the first tab 132 and the first pole 12 respectively, and the first tab 132 is connected with the first pole 12 through the first adapter sheet 14.

[0099] In the case of connection between the first tab 132 and the first pole 12 through the first adapter sheet 14, the number of the first adapter sheet 14 can be one or more. Exemplarily, as shown in Figure 3 the number of the first adapter sheet 14 is one, and the first adapter sheet 14 is connected with a plurality of first poles 12 respectively. As shown in Figure 4 the number of the first adapter sheet 14 is the same as the number of the first pole 12, and the first adapter sheet 14 is connected with the first pole 12 one by one, and part of the area of the first adapter sheet 14 is connected with the first tab 132, and part of the area of the first adapter sheet 14 is connected with the corresponding first pole 12.

[0100] In an example, as shown in Figure 3 and Figure 5 The battery monomer 1 further comprises a first adapter sheet 14, and the first adapter sheet 14 comprises a first connecting area 141 and a second connecting area 142, the first connecting area 141 is connected with the first tab 132, and the number of the second connecting area 142 is equal to the number of the first pole 12, and the second connecting area 142 is connected with the first pole 12 one by one.

[0101] Exemplarily, when one first tab 132 is connected with two first poles 12, the first adapter piece 14 comprises one first connecting area 141 and two second connecting areas 142, the two second connecting areas 142 are connected with the two first poles 12 respectively, and the first connecting area 141 is connected with the first tab 132.

[0102] The plurality of first poles 12 are spaced apart in a first direction, which can be the length direction of the battery monomer 1 or the width direction of the battery monomer 1. When the number of the first adapter pieces 14 is plural, the plurality of first adapter pieces 14 are spaced apart in the first direction between the body part 131 and the first wall 111, and there is at least a certain assembly gap between two adjacent first adapter pieces 14, which makes the space between the body part 131 and the first wall 111 for accommodating the plurality of first adapter pieces 14 relatively larger.

[0103] When the number of the first adapter pieces 14 is one and the first tab 132 is connected with the plurality of first poles 12 through one first adapter piece 14, the space between the first wall 111 and the body part 131 can be used to accommodate the first adapter piece 14, and the area of the first adapter piece 14 except the second connecting area 142 is the first connecting area 141, that is, because there is no assembly gap between two adjacent first adapter pieces 14 between the first wall 111 and the body part 131, the area of the first connecting area 141 on the first adapter piece 14 can be relatively larger, that is, the connecting area of the first adapter piece 14 and the first tab 132 is relatively larger, thereby improving the connection strength and stability between the first adapter piece 14 and the first tab 132.

[0104] When the shell 11 comprises the end cover 113 and the shell body 114, and the plurality of first poles 12 are installed on the end cover 113, during the assembly process of the battery monomer 1, the operation process of connecting the first adapter piece 14 with the plurality of first poles 12, the end cover 113 is in a state of being separated from the shell body 114, so that the connection operation space of the first adapter piece 14 and the first pole 12 is relatively larger, and when the first adapter piece 14 is connected with the first tab 132, one connection operation can realize the connection of the first adapter piece 14 and the first tab 132, and the operation steps are less. In summary, the first tab 132 is connected with the first pole 12 through one first adapter piece 14, which reduces the connection operation difficulty and improves the production efficiency.

[0105] In a possible design, one first tab 132 is connected with two first poles 12, and one first adapter piece 14 comprises one first connecting area 141 and two second connecting areas 142, and the first connecting area 141 is located between the two second connecting areas 142.

[0106] In the arrangement, the first lug 132 is provided with two first poles 12, and the number of the first poles 12 is relatively small when the width of the first wall is unchanged, so that the interval between the two first poles 12 can be relatively large, so that the heat dissipation effect of the two first poles 12 is relatively good. Since the number of the second connecting areas 142 is two, and the two second connecting areas 142 are respectively located at the two ends of the first adapter piece 14, so that the operation space is larger when the second connecting areas 142 are connected with the first poles 12, and the connection operation of the second connecting areas 142 with the first poles 12 is easy to operate.

[0107] In a possible design, as shown in Figure 3 and Figure 4 , the body part 131 is provided with a first lug 132, which is centrally arranged in the body part 131 along the second direction; a plurality of first poles 12 are arranged symmetrically with respect to the center section W along the second direction.

[0108] The second direction is the normal direction of the center section W, and the first direction is parallel to the center section W.

[0109] The first lug 132 is centrally arranged in the body part 131 along the second direction, that is, the distance between the two side edges of the first lug 132 in the second direction and the center section W is equal. The distance between one side edge of the first lug 132 in the second direction and one side edge of the body part 131 in the second direction is equal to the distance between the other side edge of the first lug 132 in the second direction and the other side edge of the body part 131 in the second direction. For example, as shown in Figure 4 , taking the second direction as the left-right direction, the distance between the left side of the first lug 132 and the left side of the body part 131 is a first distance W1, and the distance between the right side of the first lug 132 and the right side of the body part 131 is a second distance W2, and the first distance is equal to the second distance.

[0110] The plurality of first poles 12 are arranged symmetrically with respect to the center section W of the body part 131 along the second direction on the shell 11. For example, as shown in Figure 8 , when the number of the first poles 12 is two, the two first poles 12 are respectively located on the two sides of the center section W and are symmetrically arranged with respect to the center section W. As shown in Figure 9As shown, when the number of the first poles 12 is three, one of the first poles 12 is centrally arranged on the first wall 111, that is, the distance between the two ends of the first pole 12 in the second direction and the central section W is equal. The other two first poles 12 are respectively located on the two sides of the centrally arranged first pole 12, and the distance between the two adjacent first poles 12 is equal, so that an odd number of first poles 12 are arranged on the first wall 111 and symmetrically spaced relative to the central section W.

[0111] In this arrangement, since the first lug 132 is centrally arranged on the body part 131, the first lug 132 is centrally arranged on the pole piece connected thereto in the laminated body part 131, so that the current density uniformity of the pole piece is improved, that is, the current density uniformity of the body part 131 is improved. Specifically, as shown, Figure 6 As shown, the body part 131 is in a laminated structure, the first lug 132 is centrally arranged on the first pole piece 1311, and the first direction is the length direction of the battery monomer 1, and the second direction is the width direction of the battery monomer 1. For example, the width of the first lug 132 is L1, the width of the first pole piece 1311 is L2, the length of the first pole piece 1311 is L3, and in the width direction of the first pole piece 1311, the distance between one side of the first lug 132 and one side of the first pole piece 1311 and the distance between the other side of the first lug 132 and the other side of the first pole piece 1311 are equal, both being L4. When the first lug 132 is centrally arranged on the body part 131, L4 = (L2-L1) / 2. In the first pole piece 1311, the longest current transmission path is C1, C1 2 =L4 2 +L3 2 As shown, Figure 7 When the first lug 132 is not centrally arranged, that is, the first lug 132 is arranged close to one side of the first pole piece 1311 and away from the other side, the distance between one side of the first lug 132 and one side of the first pole piece 1311 is L5, and the distance between the other side of the first lug 132 and the other side of the first pole piece 1311 is L6. L5 < L4, and L6 > L4 > L5. In the first pole piece 1311, the longest current transmission path is C2, C2 2 =L6 2 +L3 2 Since L4 < L6, C1 < C2.

[0112] As can be seen from the above, when the first lug 132 is centrally arranged, the longest current transmission path C1 is relatively smaller, that is, the transmission distance of the electrons is shorter, so that the resistance can be reduced. Lower resistance can reduce the energy loss of the battery monomer 1 during charging and discharging, and can reduce heat generation, so that the battery monomer 1 can be safely charged at a higher current, and the charging speed is improved.

[0113] As shown in Figure 8 and Figure 9 , the plurality of first poles 12 are symmetrically arranged on the shell 11 relative to the central section W of the second direction, that is, at least one first pole 12 is arranged on each side of the central section W, that is, the positions of the first poles 12 in the second direction are relatively uniform. Since the number of the first lug 132 is one, the plurality of first poles 12 are all connected to the same first lug 132. The plurality of first poles 12 are arranged at intervals on the shell 11, facilitating the connection operation of the first poles 12 and the first lug 132, and the plurality of first poles 12 are arranged at intervals, facilitating the heat dissipation of the first poles 12, so as to improve the heat dissipation efficiency of the first poles 12.

[0114] In a possible design, as shown in Figure 10 , the battery monomer 1 further comprises a second pole 15, and the body part 131 is provided with a second lug 133, the second lug 133 is opposite in polarity to the first lug 132, and the second lug 133 is connected to the second pole 15.

[0115] One of the second lug 133 and the first lug 132 is a positive lug, and the other is a negative lug. In one case, the first lug 132 is a positive lug, and all the first poles 12 are positive poles. The second lug 133 is a negative lug, and all the second poles 15 are negative poles. In another case, the first lug 132 is a negative lug, and all the first poles 12 are negative poles. The second lug 133 is a positive lug, and all the second poles 15 are positive poles.

[0116] In this arrangement, the battery monomer 1 forms a current loop through the first lug 132, the first pole 12, the second lug 133 and the second pole 15.

[0117] In a possible design, the shell 11 has a first wall 111 and a second wall 115, the first pole 12 is mounted on the first wall 111, and the second pole 15 is mounted on the second wall 115. The first lug 132 is arranged at one end of the body part 131 opposite the first wall 111, and the second lug 133 is arranged at one end of the body part 131 opposite the second wall 115.

[0118] The first wall 111 can be any side wall panel of the shell 11, and the second wall 115 is a wall panel different from the first wall 111. In this arrangement, the second pole 15 and the first pole 12 are arranged on different wall panels of the shell 11, so that the shell 11 has relatively more space to mount the first pole 12 and the second pole 15.

[0119] Since the first pole post 12 is arranged on the first wall 111, the first tab 132 is arranged opposite to the first pole post 12, and the distance between the first pole post 12 and the first tab 132 is relatively short, facilitating the connection between the first pole post 12 and the first tab 132. Since the second pole post 15 is arranged on the second wall 115, the second tab 133 is arranged opposite to the second pole post 15, and the distance between the second tab 133 and the second pole post 15 is relatively short, facilitating the connection between the second tab 133 and the second pole post 15.

[0120] In a possible design, the second wall 115 is arranged opposite to the first wall 111. For example, the first wall 111 and the second wall 115 can be arranged opposite to each other in the length direction of the battery monomer 1, or can be arranged opposite to each other in the width direction of the battery monomer 1.

[0121] In this arrangement, the first tab 132 and the second tab 133 are arranged at opposite ends of the body part 131, facilitating the preparation of the electrode assembly. Moreover, the first pole post 12 and the second pole post 15 are located at opposite ends of the shell 11, facilitating the installation of the first pole post 12 and the second pole post 15 on the shell 11.

[0122] In a possible design, the number of the second pole posts 15 is plural, and at least one second tab 133 is connected to at least two second pole posts 15.

[0123] At least one second tab 133 is connected to at least two second pole posts 15, that is, in the case where the number of the second tabs 133 is one, the second tab 133 is connected to a plurality of second pole posts 15. In the case where the number of the second tabs 133 is plural, each first tab can be connected to two or more second pole posts 15, or some of the second tabs 133 are connected to a plurality of second pole posts 15, and the other second tabs 133 are connected to one second pole post 15 one by one. It should be noted that, in the case where the number of the second tabs 133 is plural, different second tabs 133 are connected to different second pole posts 15.

[0124] In this arrangement, at least one first tab 132 is connected to at least two first pole posts 12, and at least one second tab 133 is connected to at least two second pole posts 15, so that the temperature rise speed of the first pole post 12 and the second pole post 15 is reduced. Since one of the first pole post 12 and the second pole post 15 is a positive pole post, and the other is a negative pole post, the temperature rise speed of the positive pole post and the negative pole post is reduced. In the case where the number of the negative pole posts is plural, one negative tab is connected to a plurality of negative pole posts, which not only reduces the temperature rise of the negative pole post, but also reduces the risk of lithium precipitation to a certain extent.

[0125] In one possible design, the plurality of second poles 15 form a plurality of second pole assemblies, each second pole assembly includes at least two second poles 15, and each second pole assembly is in one-to-one correspondence with one second tab 133, and the second tab 133 is connected with all the second poles 15 in the corresponding second pole assembly.

[0126] When the number of second tabs 133 is more than one, the plurality of second poles 15 form a plurality of second pole assemblies, one second pole assembly includes two or more second poles 15, and the number of second poles 15 included in each second pole assembly can be the same or different. For example, when the number of second poles 15 is nine, the nine second poles can be divided into three groups, i.e., three second pole assemblies, and when the three second pole assemblies include the same number of second poles 15, each second pole assembly includes three second poles 15. When the three second pole assemblies include different numbers of second poles 15, one second pole assembly includes two second poles 15, another second pole assembly includes three second poles 15, and the third second pole assembly includes four second poles 15. In another example, one of the second pole assemblies includes five second poles 15, and the other two second pole assemblies each include two second poles 15.

[0127] The number of second pole assemblies is the same as the number of second tabs 133, and each second pole assembly is in one-to-one correspondence with one second tab 133, and the second tab 133 is connected with all the second poles 15 in the corresponding second pole assembly. For example, when the number of second tabs 133 is three, the number of second pole assemblies is three, one second pole assembly includes two second poles 15, another second pole assembly includes three second poles 15, and the third second pole assembly includes four second poles 15, one of the second tabs 133 is connected with the two second poles 15 in one second pole assembly, another second tab 133 is connected with the three second poles 15 in another second pole assembly, and the third second tab 133 is connected with the four second poles 15 in the third second pole assembly. In another example, when the number of second tabs 133 is three, the number of second pole assemblies is three, and each second pole assembly includes three second poles 15, each second tab 133 is connected with the three second poles 15 in the corresponding second pole assembly.

[0128] A second tab 133 is connected to a plurality of second terminals 15 within an opposing second terminal assembly; or, in other words, a plurality of second terminals 15 within a second terminal assembly are all connected to the same second tab 133. For example, when the second tab 133 is a positive tab, all second terminals 15 within the second terminal assembly are positive terminals. In the battery cell 1, there is one positive tab and a plurality of positive terminals, with the plurality of positive terminals connected to the same positive tab. When the second tab 133 is a negative tab, the second terminal 15 is a negative terminal. In the battery cell 1, there is one negative tab and a plurality of negative terminals, with the plurality of negative terminals connected to the same negative tab.

[0129] In this configuration, since there are multiple second terminals 15 connected to each second tab 133, the current of each second tab 133 is diverted to the corresponding multiple second terminals 15, thereby reducing the current density borne by each second terminal 15 in the battery cell 1. This reduces the heat generated by the current passing through each second terminal 15 in the same time period, which in turn reduces the rate of temperature rise of each second terminal 15 and lowers the risk of thermal runaway of the battery cell 1.

[0130] like Figure 11 As shown, in one configuration, the battery cell 1 further includes a second adapter piece 16. The second adapter piece 16 includes a third connection area 161 and two fourth connection areas 162. The two fourth connection areas 162 are located on both sides of the third connection area 161 in the width direction. The second adapter piece 16 is connected to the second electrode tab 133 through the third connection area 161. The second adapter piece 16 is connected to one of the second electrode posts 15 through one of the fourth connection areas 162. The second adapter piece 16 is connected to the other second electrode post 15 through one of the fourth connection areas 162.

[0131] When there is only one second adapter piece 16 and the second electrode 133 is connected to multiple second pole pieces 15 through one second adapter piece 16, the space between the second wall 115 and the main body 131 can be used to accommodate the second adapter piece 16. The area on the second adapter piece 16 other than the fourth connection area 162 is the third connection area 161. That is, since there is no need to set an assembly gap between two adjacent second adapter pieces 16 between the second wall 115 and the main body 131, the area of ​​the third connection area 161 on the second adapter piece 16 can be relatively larger. That is, the connection area between the second adapter piece 16 and the second electrode 133 is relatively larger, thereby improving the connection strength and connection stability between the second adapter piece 16 and the second electrode 133.

[0132] like Figure 12As shown, in some other arrangements, the second tabs 133 and the second poles 15 can be the same in number and connected one by one. In the case where the number of second tabs 133 is one, the number of second poles 15 is one, and the second tab 133 is connected to the second pole 15. In the case where the number of second tabs 133 is multiple, and the number of second poles 15 is multiple, the multiple second tabs 133 and the multiple second poles 15 are connected one by one.

[0133] In the case where the number of second tabs 133 is multiple, the current of the body part 131 flows to the multiple second tabs 133 respectively, that is, is divided at the second tabs 133, so that the current density of the second poles 15 is reduced, thereby reducing the heat generated by the current passing through the second poles 15 in the same time period, that is, reducing the speed of temperature rise of the second poles 15, and reducing the risk of thermal runaway of the battery monomer 1.

[0134] In one specific embodiment of the present application, the battery monomer 1 comprises a shell 11, an electrode assembly 13, a first adapter sheet 14, a second adapter sheet 16, a first pole 12 and a second pole 15, the number of first poles 12 is two, the number of second poles 15 is two, the first pole 12 is a negative pole, and the second pole 15 is a positive pole. The first direction is the length direction of the battery monomer 1, the second direction is the width direction of the battery monomer 1, the wall plates at both ends of the shell 11 in the first direction are respectively a first wall 111 and a second wall 115, two first poles 12 are arranged on the first wall 111 in the second direction, and two second poles 15 are arranged on the second wall 115 in the second direction. The two first poles 12 are symmetrically arranged relative to the center section W, and the two second poles 15 are symmetrically arranged relative to the center section W.

[0135] The electrode assembly 13 includes a body portion 131, a first tab 132, and a second tab 133. The body portion 131 includes positive electrode sheets, negative electrode sheets, and separators. The positive electrode sheets and the negative electrode sheets are each a plurality of sheets. The plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked with the separators disposed therebetween. The body portion 131 has the first tab 132 disposed at one end thereof facing the first wall 111. The first tab 132 is a negative tab. The second tab 133 is a positive tab. The body portion 131 has the second tab 133 disposed at one end thereof facing the second wall 115. The second tab 133 is connected to the positive electrode sheets. The number of the first tabs 132 is one. The first tab 132 is centrally disposed on the body portion 131 in the second direction. The number of the second tabs 133 is one. The second tab 133 is centrally disposed on the body portion 131 in the second direction. The first adapter tab 14 includes one first connection region 141 and two second connection regions 142. The two second connection regions 142 are disposed on both sides of the first connection region 141 in the second direction. The first adapter tab 14 is connected to the first tab 132 via the first connection region 141. The first adapter tab 14 is connected to one of the first poles 12 via one of the second connection regions 142. The first adapter tab 14 is connected to the other of the first poles 12 via the other of the second connection regions 142. The second adapter tab 16 includes one third connection region 161 and two fourth connection regions 162. The two fourth connection regions 162 are disposed on both sides of the third connection region 161 in the second direction. The second adapter tab 16 is connected to the second tab 133 via the third connection region 161. The second adapter tab 16 is connected to one of the second poles 15 via one of the fourth connection regions 162. The second adapter tab 16 is connected to the other of the second poles 15 via the other of the fourth connection regions 162.

[0136] The application also provides a battery device including a plurality of the battery cell provided by the embodiments.

[0137] As shown in Figure 13 The battery device 21 can include one or more battery cell assemblies 211 for providing voltage and capacity. The battery cell assembly 211 can include a plurality of battery cells connected in series, in parallel, or in a mixed connection via a busbar.

[0138] In some embodiments, the battery cell assembly 211 is generally formed by arranging a plurality of battery cells 1.

[0139] As an example, the battery cell assembly 211 can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0140] In some embodiments, the battery device 21 may be a battery pack, which includes a housing 212 and one or more battery cell assemblies 211, the battery cell assemblies 211 being housed in the housing 212.

[0141] As an example, the battery cell assembly 211 can be a battery module, and the battery cell assembly 211 can be housed in the housing 212 by fixing the battery module in the housing 212.

[0142] As an example, the battery cell assembly 211 can also be housed in the housing 212 by directly fixing multiple battery cells to the housing 212.

[0143] As an example, such as Figure 13 As shown, the housing 212 may include a first housing 2121 and a second housing 2122. The first housing 2121 and the second housing 2122 are fastened together to form a closed space inside the housing 212 to house the battery cell assembly 211. Here, "closed" refers to covering or closing, which can be sealed or not sealed. The first housing 2121 may be a top cover or a bottom plate.

[0144] As an example, the housing 212 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 212 forms an enclosed space to house the battery cell assembly 211.

[0145] In some embodiments, the housing 212 may be part of the vehicle's chassis structure. For example, a portion of the housing 212 may be at least a portion of the vehicle's floor, or a portion of the housing 212 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0146] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0147] This application provides an electrical device including the aforementioned battery device. The battery device is used to store or provide electrical energy.

[0148] like Figure 14As shown, for the convenience of description, the vehicle is taken as an example of the power utilization device in this example, and the vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a plug-in hybrid automobile, etc. The vehicle can be provided with a driving mechanism 23, a control mechanism 22, and a battery device 21, the driving mechanism 23 can be a motor, etc., and the control mechanism 22 is used to control the battery device 21 to supply power to the driving mechanism 23. For example, the battery device 21 can be arranged at the bottom, the front, or the rear of the vehicle. The battery device 21 can be used to supply power to other equipment of the vehicle, for example, the battery device 21 can be used as an operating power source of the vehicle, and is used for the circuit system of the vehicle, for example, for the power demand of the vehicle during starting, navigation, and operation. In another example, the battery device 21 can not only be used as an operating power source of the vehicle, but also can be used as a driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving force for the vehicle. The vehicle in this example adopts the above-mentioned battery device 21, and by improving the reliability of the battery device 21, the reliability of the power utilization device can be improved.

[0149] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing; a plurality of first poles, each of the first poles being mounted on the housing; an electrode assembly disposed in the housing, the electrode assembly comprising a body portion and a first tab disposed on the body portion, the number of the first tabs being less than the number of the first poles, at least one of the first tabs being connected to at least two of the first poles.

2. The battery cell of claim 1, wherein, The body portion has a first end face, the first tab protrudes from the first end face in a first direction, in a second direction, the maximum dimension of the first tab is L1, the dimension of the body portion is L2, 0.1≤L1 / L2≤1, the second direction being perpendicular to the first direction.

3. The battery cell of claim 2, wherein, 0.5≤L1 / L2≤1.

4. The battery cell according to claim 2 or 3, wherein In the first direction, the dimension of the first tab protruding from the first end face is H1, 0.2≤H1 / L1≤0.

9.

5. The battery cell of claim 4, wherein the cathode comprises a lithium metal oxide. 0.5≤H1 / L1≤0.

8.

6. The battery cell of any one of claims 1 to 5, wherein, The battery cell further comprises a first adapter tab, the first adapter tab comprising a first connecting region and a second connecting region, the first connecting region being connected to the first tab, the number of the second connecting regions being the same as the number of the first poles, each of the second connecting regions being connected to one of the first poles.

7. The battery cell of claim 6, wherein the cathode comprises a lithium metal oxide. One of the first tabs is connected to two of the first poles, one of the first adapter tabs comprises one of the first connecting regions and two of the second connecting regions, the first connecting region being located between the two of the second connecting regions.

8. The battery cell of any one of claims 2 to 5, wherein, The body portion is provided with one of the first tabs, in the second direction, the first tab is centrally disposed on the body portion; the plurality of the first poles are spaced apart and symmetrically disposed with respect to a central cross section, the central cross section being perpendicular to the second direction.

9. The battery cell of any one of claims 1 to 8, wherein, The battery cell further comprises a second pole, the body portion is provided with a second tab, the second tab being opposite in polarity to the first tab, the second tab being connected to the second pole.

10. The battery cell of claim 9, wherein, The housing has a first wall and a second wall, the first poles being mounted on the first wall, the second poles being mounted on the second wall, the first tab being disposed on one end of the body portion opposite to the first wall, the second tab being disposed on one end of the body portion opposite to the second wall.

11. The battery cell according to claim 9 or 10, wherein The number of the second poles is a plurality, at least one of the second tabs being connected to at least two of the second poles.

12. The battery cell of any one of claims 1 to 11, wherein, The housing comprises a housing body and an end cover, the end cover being covered on an opening of the housing body, the plurality of the first poles being disposed on the end cover.

13. A battery device characterized by comprising: The battery device comprises a plurality of the battery cells as claimed in any one of claims 1 to 12.

14. An electrical device, comprising: The battery device as claimed in claim 13.

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