Battery monomer and battery pack

Abstract

The utility model provides a battery monomer and a battery pack, and relates to the technical field of batteries. The single battery comprises a shell with a containing cavity, a first cover plate connected with one end of the shell, a second cover plate connected with the other end of the shell, and an electrode assembly arranged in the containing cavity. The first cover plate is provided with a pole electrically connected with the electrode assembly, the second cover plate is provided with an anti-explosion valve, the first cover plate and the second cover plate are oppositely arranged, the electrode assembly comprises a plurality of battery cells which are arranged in an arrayed mode, and the electrode assembly and the first side wall of the shell jointly define an exhaust channel which is arranged in an extending mode. When the battery monomer provided by the utility model is subjected to thermal runaway, high-temperature and high-pressure gas can quickly reach the explosion-proof valve for pressure relief under the guidance of the exhaust channel, and the risk of short circuit is lower.

Description

TECHNICAL FIELD

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

[0002] The information disclosed in this Background section is only for the purpose of enhancing the understanding of the general background of the present disclosure and does not necessarily represent the prior art known to those skilled in the art.

[0003] The battery monomer is an important component of the battery pack. With the development of battery technology, the size of the battery monomer is becoming larger and larger, which leads to a longer exhaust path. If the pressure is not released in time, or if the insulation of the pole is lost during pressure release, a short circuit will occur, which will easily lead to thermal runaway of the battery monomer, and even spread to the entire battery pack to cause thermal runaway. Therefore, how to provide an effective exhaust path to enhance the safety of the battery monomer is a problem to be solved. UTILITY MODEL CONTENT

[0004] Therefore, the purpose of the present application is to provide a battery monomer and a battery pack, which aims to solve the technical problem of how to provide an effective exhaust path to enhance the safety of the battery monomer.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] In a first aspect, the embodiments of the present application provide a battery monomer having a first direction, a second direction and a third direction intersecting with each other, the battery monomer comprising:

[0007] a housing having a receiving cavity;

[0008] a first cover plate connected to one end of the housing along the third direction to cover the receiving cavity, the first cover plate being provided with a pole;

[0009] a second cover plate connected to the other end of the housing along the third direction to cover the receiving cavity, the second cover plate and the first cover plate being oppositely arranged along the third direction, the second cover plate being provided with an explosion-proof valve;

[0010] an electrode assembly arranged in the receiving cavity and electrically connected to the pole, the electrode assembly comprising a plurality of battery cells arranged along the second direction, the housing having a first side wall oppositely arranged along the first direction, the electrode assembly and the first side wall jointly defining an exhaust passage, the exhaust passage being arranged along the third direction.

[0011] In one of the embodiments of the first aspect, the second cover plate is provided with a protrusion, the protrusion is protruded in a direction away from the electrode assembly, so that an exhaust groove is formed on a side of the second cover plate facing the electrode assembly, and the explosion-proof valve is arranged on the protrusion, and the exhaust groove is communicated with the exhaust channel.

[0012] In one of the embodiments of the first aspect, the number of the exhaust channels is two, and the two exhaust channels are arranged in the first direction.

[0013] In one of the embodiments of the first aspect, the dimension of the electrode assembly in the first direction is height, and the height of part of the plurality of electrode assemblies increases in the second direction in a stepped manner, so that the electrode assembly and the first side wall jointly define the exhaust channel.

[0014] In one of the embodiments of the first aspect, the electrode assembly is provided with an adhesive layer on at least one side in the first direction, the adhesive layer extends in the second direction and is connected with each of the electrode assemblies.

[0015] In one of the embodiments of the first aspect, the electrode assembly comprises an electrode body and a tab connected with each other, the tab is located on a side of the electrode body close to the pole in the third direction, and the pole is arranged through the first cover plate and is electrically connected with each of the tabs.

[0016] In one of the embodiments of the first aspect, the battery monomer further comprises an insulation film located in the accommodating cavity, the insulation film is wrapped on the outer circumferential side of the electrode assembly, and the insulation film and the first side wall jointly define the exhaust channel.

[0017] In one of the embodiments of the first aspect, the battery monomer has a first central axis and a second central axis perpendicular to each other, the first central axis is parallel to the first direction, the second central axis is parallel to the second direction, and the electrode assembly is symmetrically arranged with respect to the first central axis and the second central axis respectively.

[0018] In one of the embodiments of the first aspect, the battery monomer further comprises a connecting sheet located in the accommodating cavity, the connecting sheet is located between the electrode assembly and the first cover plate in the third direction, and the connecting sheet is electrically connected with the pole and each of the electrode assemblies respectively.

[0019] In the second aspect, the embodiments of the present application provide a battery pack comprising the battery monomer of any one of the embodiments of the first aspect.

[0020] The beneficial effects of the present application are as follows:

[0021] The battery cell provided in this application features an extended venting channel defined by the electrode assembly and the first sidewall of the casing. This venting channel allows high-temperature, high-pressure gas to be quickly guided to the explosion-proof valve for depressurization. Simultaneously, because the first cover plate is connected to one end of the casing and the second cover plate is connected to the other end, with the electrode post mounted on the first cover plate and the explosion-proof valve on the second cover plate, the explosion-proof valve and the electrode post are positioned far apart, reducing the possibility of short circuits during the depressurization of high-temperature, high-pressure gas. Therefore, the safety of the battery cell is effectively enhanced.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This application shows a three-dimensional exploded view of a single battery cell in some embodiments;

[0025] Figure 2 This application shows a schematic diagram of the structure of a single battery cell from one perspective in some embodiments;

[0026] Figure 3 It shows Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0027] Figure 4 This paper shows a schematic diagram of the housing structure from one perspective in some embodiments of this application;

[0028] Figure 5 It shows Figure 4 Schematic diagram of the cross-sectional structure at point BB;

[0029] Figure 6 This application shows a three-dimensional exploded view of a battery cell in some other embodiments;

[0030] Figure 7 A schematic diagram of the battery cell from one perspective is shown in some other embodiments of this application;

[0031] Figure 8 It shows Figure 7 A schematic diagram of the cross-sectional structure at point CC.

[0032] Main element symbol explanation:

[0033] 100 - battery cell; 110 - shell; 111 - accommodating cavity; 112 - first side wall; 113 - first opening; 114 - second opening; 115 - corner; 116 - second side wall; 120 - first cover plate; 140 - second cover plate; 141 - exhaust groove; 142 - protruding part; 150 - electrode assembly; 151 - battery cell body; 1511 - battery cell body; 1512 - tab; 160 - pole; 170 - explosion-proof valve; 181 - exhaust passage; 182 - insulating film; 183 - connecting piece; x - first direction; y - second direction; z - third direction; J - first central axis; K - second central axis. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described below in detail, 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, for the purpose of explanation, and are not to be understood as a limitation of the present application.

[0035] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In addition, the terms "first", "second" are only for the purpose of description, 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 "a plurality of" is two or more, unless otherwise specifically limited.

[0037] In this application, unless specifically defined otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected 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 meaning of the above terms in this application can be understood according to the specific circumstances.

[0038] In this application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature can be above, above and above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature can be below, below and below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0039] As shown in Figure 1 and Figure 2 The first aspect, the embodiments of the present application provide a battery monomer 100, which relates to the technical field of battery, and is mainly applied to a battery pack, so as to be applied to an electric device such as a new energy vehicle, a ship and a spacecraft in the form of a battery pack, or to an energy storage device such as an energy storage container and an energy storage power station. Of course, the battery monomer 100 can also be directly applied to an electric device or an energy storage device without adopting the form of a battery pack, and the application scene of the battery monomer 100 is not specifically limited here.

[0040] As shown in Figures 3 to 5 The battery monomer 100 provided by the embodiment has first direction x, second direction y and third direction z intersecting with each other, and comprises a shell 110, a first cover plate 120, a second cover plate 140 and an electrode assembly 150.

[0041] The shell 110 has a containing cavity 111, a first cover plate 120 is connected to one end of the shell 110 along the third direction z to cover the containing cavity 111, the first cover plate 120 is provided with a pole column 160, a second cover plate 140 is connected to the other end of the shell 110 along the third direction z to cover the containing cavity 111, the second cover plate 140 and the first cover plate 120 are oppositely arranged along the third direction z, the second cover plate 140 is provided with an explosion-proof valve 170, an electrode assembly 150 is arranged in the containing cavity 111 and electrically connected with the pole column 160, the electrode assembly 150 comprises a plurality of battery cells 151 arranged along the second direction y, the shell 110 has a first side wall 112 oppositely arranged along the first direction x, the electrode assembly 150 and the first side wall 112 jointly define an exhaust passage 181, and the exhaust passage 181 is arranged along the third direction z.

[0042] It can be understood that the battery monomer 100 provided by the embodiment can guide the high-temperature and high-pressure gas to quickly reach the explosion-proof valve 170 for pressure relief through the exhaust passage 181, because the electrode assembly 150 and the first side wall 112 of the shell 110 jointly define the exhaust passage 181 arranged along the third direction z. At the same time, because the first cover plate 120 is connected to one end of the shell 110, the second cover plate 140 is connected to the other end of the shell 110, the pole column 160 is arranged on the first cover plate 120, and the explosion-proof valve 170 is arranged on the second cover plate 140, the explosion-proof valve 170 and the pole column 160 are away from each other, so that the possibility of short circuit when the high-temperature and high-pressure gas is relieved is reduced. Therefore, the safety of the battery monomer 100 is effectively enhanced.

[0043] Exemplarily, the pole column 160 can be a positive pole column or a negative pole column, which is not specifically limited here. The number of battery cells 151 can be two, three, four, five, six, seven, eight, nine, ten, etc., which is not specifically limited here.

[0044] As shown in FIG. 1, Figures 1 to 3 In one embodiment, the second cover plate 140 is provided with a protruding portion 142, the protruding portion 142 is arranged in a direction away from the electrode assembly 150, so that the side of the second cover plate 140 facing the electrode assembly 150 forms an exhaust groove 141, the explosion-proof valve 170 is arranged on the protruding portion 142, and the exhaust groove 141 is in communication with the exhaust passage 181.

[0045] It can be understood that, since the second cover plate 140 is provided with the exhaust groove 141 on the side facing the electrode assembly 150, the exhaust groove 141 is in communication with the exhaust channel 181, and the position of the explosion-proof valve 170 corresponds to the exhaust groove 141, so that when the battery monomer 100 is in thermal runaway, the high-temperature and high-pressure gas can quickly reach the exhaust groove 141 through the exhaust channel 181, and then be discharged through the explosion-proof valve 170 to achieve pressure relief. In this process, through the arrangement of the exhaust groove 141, the high-temperature and high-pressure gas can be more smoothly discharged through the explosion-proof valve 170.

[0046] Further, the second cover plate 140 is provided with a plurality of strip-shaped exhaust grooves on the side facing the electrode assembly 150, each adjacent two strip-shaped exhaust grooves are arranged at intervals, one end of each strip-shaped exhaust groove is in communication with the exhaust groove 141, and the other end of each strip-shaped exhaust groove is in communication with the exhaust channel 181. In this way, when the battery monomer 100 is in thermal runaway, the strip-shaped exhaust groove can improve the flow rate of the gas to guide the high-temperature and high-pressure gas to quickly enter the exhaust groove 141 from the exhaust channel 181 to be discharged through the explosion-proof valve 170.

[0047] As shown in Figure 2 , Figure 3 , Figure 7 and Figure 8 , in one embodiment, the number of exhaust channels 181 is two, and the two exhaust channels 181 are arranged at intervals along the first direction x.

[0048] It can be understood that, by arranging two exhaust channels 181 at intervals along the first direction x, each exhaust channel 181 can disperse the high-temperature and high-pressure gas to the explosion-proof valve 170, thereby improving the pressure relief efficiency when the battery monomer 100 is in thermal runaway and enhancing the safety of the battery monomer 100.

[0049] In another embodiment, the number of exhaust channels 181 is one, three, four, etc., and the number of exhaust channels 181 is not specifically limited here.

[0050] As shown in Figure 2 , Figure 3 , Figure 7 and Figure 8 , in one embodiment, the size of the cell 151 along the first direction x is the height, and the heights of part of the cells 151 in the plurality of cells 151 increase in a stepped manner along the direction close to the first side wall 112, so that the electrode assembly 150 and the first side wall 112 jointly define the exhaust channel 181.

[0051] It can be understood that, due to the fact that the heights of the partial cells 151 in the plurality of cells 151 increase in a stepped manner along the second direction y and the plurality of cells 151 are arranged along the second direction y, the exhaust passage 181 can be formed, so as to facilitate rapid pressure relief when the battery monomer 100 is in thermal runaway.

[0052] In another embodiment, the shell 110 has a second side wall 116 oppositely arranged along the second direction y, the second side wall 116 and the first side wall 112 enclose at least two corners 115, the dimension of the cell 151 along the first direction x is the height, the heights of the partial cells 151 in the plurality of cells 151 decrease in a stepped manner along the second direction y, so that the electrode assembly 150 and the first side wall 112 jointly define the exhaust passage 181, and the electrode assembly 150 and the second side wall 116 jointly define the exhaust passage 181, that is, each corner 115 has two exhaust passages 181 that are in communication with each other.

[0053] In an embodiment, the electrode assembly 150 is provided with an adhesive layer on at least one side along the first direction x, the adhesive layer is arranged to extend along the second direction y and is connected with each cell 151.

[0054] Exemplarily, the adhesive layer can be formed by coating adhesive on the electrode assembly 150, or a tape is selected as the adhesive layer, and the type of the adhesive layer is not specifically limited here.

[0055] It can be understood that, by using the adhesive layer to be connected with each cell 151, the plurality of cells 151 can be fixedly bonded, so that the plurality of cells 151 can be stably arranged in the accommodating cavity 111 along the second direction y, thereby facilitating stable pressure relief when the battery monomer 100 is in thermal runaway.

[0056] As shown in FIG. 1, Figures 1 to 3 In an embodiment, the cell 151 includes a cell body 1511 and a tab 1512 connected with each other, the tab 1512 is located on the side of the cell body 1511 close to the pole 160 along the third direction z, and the pole 160 is arranged to pass through the first cover plate 120 and is electrically connected with each tab 1512.

[0057] Exemplarily, the tab 1512 can be a positive tab or a negative tab, when the tab 1512 is the positive tab, the pole 160 is a positive pole, and when the tab 1512 is the negative tab, the pole 160 is a negative pole, and the type of the tab 1512 is not specifically limited here.

[0058] Understandably, since the tab 1512 is located on the side of the cell body 1511 along the third direction z that is closer to the pole post 160, that is, on the side of the cell body 1511 along the third direction z that is farther away from the explosion-proof valve 170, the explosion-proof valve 170 and the tab 1512 are far apart from each other, which reduces the possibility of short circuit caused by gas impacting the tab 1512 when depressurizing high-temperature and high-pressure gas.

[0059] like Figures 1 to 3 As shown, in one embodiment, the battery cell 100 further includes an insulating film 182 located in the receiving cavity 111. The insulating film 182 wraps around the outer periphery of the electrode assembly 150 to achieve insulation between the housing 110 and the electrode assembly 150. At the same time, the insulating film 182 and the first sidewall 112 jointly define an exhaust channel 181, that is, the first sidewall 112 indirectly defines the exhaust channel 181 with the electrode assembly 150 through the insulating film 182.

[0060] Of course, in the above embodiment, the first sidewall 112 can also directly define the exhaust channel 181 together with the electrode assembly 150.

[0061] like Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, in one embodiment, the battery cell 100 has a first central axis J and a second central axis K that are perpendicular to each other. The first central axis J is parallel to a first direction x, and the second central axis K is parallel to a second direction y. The electrode assembly 150 is symmetrically arranged about the first central axis J and the second central axis K, respectively.

[0062] It is understandable that when there are two exhaust channels 181, and the two exhaust channels 181 are located on two opposite sides of the electrode assembly 150 along the first direction x, by symmetrically arranging the electrode assembly 150 about the first central axis J and the second central axis K, the exhaust pressure in the two opposite exhaust channels 181 along the first direction x of the electrode assembly 150 can be relatively balanced, thereby achieving stable pressure relief when the battery cell 100 experiences thermal runaway.

[0063] Of course, an exhaust channel 181 can also be formed without using a symmetrical approach to achieve the discharge of high-temperature and high-pressure gas. No specific restrictions are placed on the shape or structure of the electrode assembly 150 here.

[0064] like Figure 1 and Figure 6As shown, in one embodiment, the battery monomer 100 further comprises a connecting piece 183 located in the accommodating cavity 111, the connecting piece 183 is located between the electrode assembly 150 and the first cover plate 120 along the third direction z, and the connecting piece 183 is electrically connected with the pole 160 and each battery cell 151 respectively to realize the electrical connection between each battery cell 151 and the pole 160.

[0065] It can be understood that, since the connecting piece 183 is located between the electrode assembly 150 and the first cover plate 120 along the third direction z, the explosion-proof valve 170 and the connecting piece 183 are far away from each other, which reduces the possibility of breaking the electrical connection between the electrode assembly 150 and the pole 160 due to the impact of the high-temperature and high-pressure gas on the connecting piece 183 when the high-temperature and high-pressure gas is discharged, and improves the service life of the battery monomer 100.

[0066] As shown in Figure 1 and Figure 6 As shown, in one embodiment, the shell 110 is provided with a first opening 113 and a second opening 114, the first opening 113 and the second opening 114 are oppositely arranged along the third direction z, the first cover plate 120 is welded with the shell 110 to close the first opening 113, and the second cover plate 140 is welded with the shell 110 to close the second opening 114.

[0067] It can be understood that the above structure means that the second cover plate 140 and the shell 110 are two independent parts, that is, the shell 110 and the second cover plate 140 are separately arranged, and when the battery monomer 100 is manufactured, the exhaust groove 141 can be processed on the second cover plate 140 first, and then the second cover plate 140 is welded on the shell 110 to close the second opening 114, which reduces the processing difficulty of the exhaust groove 141.

[0068] Of course, for the above embodiment, the second cover plate 140 and the shell 110 can be integrally formed to form an outer shell, compared with the separate arrangement of the shell 110 and the second cover plate 140, the outer shell integrally formed has higher structural strength and stability.

[0069] In a second aspect, the embodiments of the present application provide a battery pack, comprising a battery box and the battery monomer 100 in any of the embodiments of the first aspect, the battery monomer 100 is arranged in the interior of the battery box, and the explosion-proof valve 170 is arranged on one side of the battery box along the third direction z.

[0070] It can be understood that, for the convenience of description, the battery pack is taken as an example applied in a new energy vehicle here, when the battery monomer 100 occurs thermal runaway, the exhaust passage 181 can guide the high-temperature and high-pressure gas to dissipate to the two opposite sides of the battery box along the third direction z, thereby reducing the risk of the high-temperature and high-pressure gas dissipating to the top of the battery box along the second direction y and endangering the safety of the people in the vehicle.

[0071] It should be understood that, due to the battery pack provided by the present embodiment, the battery cell 100 in any embodiment of the first aspect described above is provided, thus having all the beneficial effects of the battery cell 100, which will not be repeated here.

[0072] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific feature, structure, material or characteristic described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the features of different embodiments or examples described in the present specification and the features of different embodiments or examples, without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A battery cell, characterized by, The battery cell has a first direction (x), a second direction (y) and a third direction (z) intersecting with each other, and comprises: a housing (110) having a receiving cavity (111); a first cover plate (120) connected to one end of the housing (110) along the third direction (z) to cover the receiving cavity (111), the first cover plate (120) being provided with a pole (160); a second cover plate (140) connected to the other end of the housing (110) along the third direction (z) to cover the receiving cavity (111), the second cover plate (140) and the first cover plate (120) being oppositely arranged along the third direction (z), the second cover plate (140) being provided with an explosion-proof valve (170); an electrode assembly (150) arranged in the receiving cavity (111) and electrically connected to the pole (160), the electrode assembly (150) comprising a plurality of battery cells (151) arranged along the second direction (y), the housing (110) having a first side wall (112) oppositely arranged along the first direction (x), the electrode assembly (150) and the first side wall (112) jointly defining an exhaust passage (181) extending along the third direction (z).

2. The battery cell of claim 1, wherein, The second cover plate (140) is provided with a protruding portion (142) protruding in a direction away from the electrode assembly (150) to form an exhaust groove (141) on a side of the second cover plate (140) facing the electrode assembly (150), the explosion-proof valve (170) being arranged on the protruding portion (142), the exhaust groove (141) being in communication with the exhaust passage (181).

3. The battery cell of claim 1, wherein, The number of the exhaust passages (181) is two, and the two exhaust passages (181) are arranged at intervals along the first direction (x).

4. The battery cell of claim 1, wherein, The dimension of the battery cell (151) along the first direction (x) is a height, and the heights of some of the battery cells (151) among the plurality of battery cells (151) increase in a stepped manner along the second direction (y) to jointly define the exhaust passage (181) with the first side wall (112).

5. The battery cell of claim 1, wherein, At least one side of the electrode assembly (150) along the first direction (x) is provided with an adhesive layer extending along the second direction (y) and connected to each of the battery cells (151).

6. The battery cell of claim 1, wherein, The battery cell (151) comprises a battery cell body (1511) and a tab (1512) connected to each other, the tab (1512) being located on a side of the battery cell body (1511) close to the pole (160) along the third direction (z), the pole (160) penetrating the first cover plate (120) and being electrically connected to each of the tabs (1512).

7. The battery cell according to any one of claims 1 to 6, characterized in that, The battery cell further comprises an insulation film (182) located in the accommodating cavity (111), the insulation film (182) being wrapped on the outer circumferential side of the electrode assembly (150), and the insulation film (182) and the first side wall (112) jointly defining the exhaust passage (181).

8. The battery cell of any one of claims 1 to 6, wherein, The battery cell has a first central axis (J) and a second central axis (K) perpendicular to each other, the first central axis (J) being parallel to the first direction (x), and the second central axis (K) being parallel to the second direction (y), and the electrode assembly (150) is symmetrically arranged with respect to the first central axis (J) and the second central axis (K) respectively.

9. The battery cell of any one of claims 1 to 6, wherein, The battery cell further comprises a connecting piece (183) located in the accommodating cavity (111), the connecting piece (183) being located between the electrode assembly (150) and the first cover plate (120) along the third direction (z), and the connecting piece (183) being electrically connected with the pole column (160) and each of the battery cells (151) respectively.

10. A battery pack, characterized by, A battery cell according to any one of claims 1 to 9. A battery cell according to any one of claims 1 to 9.

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