Battery cell, battery, energy storage device, and electric device

Abstract

Disclosed in the present invention are a battery cell, a battery, an energy storage device, and an electric device. Electrode lead-out members of the battery cell each comprise a first portion, a middle portion, and a second portion; the second portion of a first electrode lead-out member is connected to a first tab; the second portion of a second electrode lead-out member is connected to a second tab; in a first direction, a ratio of the distance between the central axis of the first portion of the first electrode lead-out member and the central axis of the first portion of the second electrode lead-out member to the size of a first casing wall is not greater than 60%; the second portion of each electrode lead-out member comprises a body portion coinciding with the corresponding first portion in the wall thickness direction of the first casing wall, and an extension portion exceeding the first portion in the first direction; the extension portion of the first electrode lead-out member is located on the side of the body portion of the first electrode lead-out member facing the second electrode lead-out member; and the extension portion of the second electrode lead-out member is located on the side of the body portion of the second electrode lead-out member facing away from the first electrode lead-out member. The present invention has high volume energy density and high structural strength.

Description

Battery cell, battery, energy storage device and electric device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, in particular to a battery cell, a battery, an energy storage device and an electric device. BACKGROUND

[0002] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are increasingly used in the field of energy storage and the like. In new energy vehicles equipped with batteries, the batteries can be used to provide all or part of the power. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side.

[0003] The structural strength of a battery is related to the service life of the battery. Therefore, how to improve the structural strength of the battery is one of the subjects that the industry needs to research to prolong the service life of the battery. In addition, the industry continues to demand higher volumetric energy density of the battery.

[0004] SUMMARY

[0005] In view of the above, the present disclosure aims to provide a battery cell, a battery, an energy storage device and an electric device with high volumetric energy density and high structural strength.

[0006] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions.

[0007] The first aspect of the present disclosure provides a battery cell, comprising: a housing having a first housing wall and a receiving cavity; an electrode assembly arranged in the receiving cavity, the electrode assembly having at least two tabs, the at least two tabs including a first tab and a second tab; and at least two electrode leads, including a first electrode lead and a second electrode lead, each of the electrode leads being arranged on the first housing wall and aligned along a first direction, wherein each of the electrode leads includes a first portion located outside the housing, a second portion located inside the housing, and an intermediate portion connected between the first portion and the second portion, the second portion of the first electrode lead is connected to the first tab, and the second portion of the second electrode lead is connected to the second tab, a ratio of a distance between a center axis of the first portion of the first electrode lead and a center axis of the first portion of the second electrode lead to a size of the first housing wall is not greater than 60% in the first direction, the second portion of each of the electrode leads includes a body portion coinciding with the first portion in a thickness direction of the first housing wall, and an extension portion extending beyond the first portion along the first direction, the extension portion of the first electrode lead is located on a side of the body portion of the first electrode lead facing the second electrode lead, and the extension portion of the second electrode lead is located on a side of the body portion of the second electrode lead facing away from the first electrode lead.

[0008] In the technical scheme of the embodiments of the present disclosure, the extension portion of the second portion of the first electrode lead and the extension portion of the second portion of the second electrode lead extend from the body portions connected thereto to the same side, that is, the second portions of the first electrode lead and the second electrode lead are arranged in the same direction, which is conducive to reducing the distance between the first portion of the first electrode lead and the first portion of the second electrode lead, and the present disclosure further limits the range of the ratio of the distance between the center axis of the first portion of the first electrode lead and the center axis of the first portion of the second electrode lead to the size of the first housing wall, so that the first electrode lead and the second electrode lead are arranged more concentratedly, which is conducive to improving the structural strength of the first housing wall, and the continuous space of the inside and outside of the first housing wall is relatively large, which is conducive to the arrangement of other components, and further conducive to improving the volumetric energy density of the battery cell.

[0009] In some embodiments, each of the electrode leads includes an electrode terminal passing through a terminal mounting hole of the first housing wall, and a connecting tab connected to one end of the electrode terminal located in the receiving cavity, the portion of the electrode terminal located outside the housing is the first portion, the portion of the electrode terminal located in the terminal mounting hole is the intermediate portion, and the portion of the electrode terminal located inside the housing and the connecting tab form the second portion.

[0010] Thus, the electrode terminal and the adapter plate are connected to form an electrode lead-out piece for leading in or out of current. Moreover, the first electrode lead-out piece and the second electrode lead-out piece are arranged relatively concentratedly, which is conducive to improving the structural strength of the first shell wall, and moreover, the continuous space of the first shell wall is relatively large on the inside and outside, which is conducive to the arrangement of other components, and further conducive to improving the volumetric energy density of the battery monomer.

[0011] In some embodiments, the second part is a one-piece structure.

[0012] The second part is a one-piece structure, so that the structural strength of the electrode lead-out piece is high, and the time occupied by the assembly of the split structure is also reduced.

[0013] In some embodiments, one of the first tab and the second tab is a positive electrode tab, and the other is a negative electrode tab.

[0014] Thus, one of the first electrode lead-out piece and the second electrode lead-out piece is a positive electrode terminal, and the other is a negative electrode terminal. Moreover, the structural strength of the battery monomer is high, and the volumetric energy density is high.

[0015] In some embodiments, the first tab and the second tab are both positive electrode tabs, or the first tab and the second tab are both negative electrode tabs.

[0016] Thus, the first electrode lead-out piece and the second electrode lead-out piece are terminals of the same polarity, both positive electrode terminals or both negative electrode terminals. Moreover, the structural strength of the battery monomer is high, and the volumetric energy density is high.

[0017] In some embodiments, the first tab and the second tab are formed in one piece.

[0018] Thus, the first tab and the second tab are formed in one piece, which is conducive to the first electrode lead-out piece and the second electrode lead-out piece being closer, and further conducive to improving the structural strength of the first shell wall, and moreover, the continuous space of the first shell wall is larger on the inside and outside, which is conducive to the arrangement of other components, and further conducive to improving the volumetric energy density of the battery monomer.

[0019] In some embodiments, the first tab and the second tab are arranged in a spaced manner.

[0020] Thus, the first tab and the second tab do not affect each other, and the first electrode lead-out piece and the second electrode lead-out piece are connected to the first tab and the second tab respectively, so that the first electrode lead-out piece and the second electrode lead-out piece do not affect each other.

[0021] In some embodiments, the minimum distance between the second part of the first electrode lead-out piece and the second part of the second electrode lead-out piece in the first direction is not less than 5mm.

[0022] The second part of the first electrode lead-out piece protrudes beyond the edge of the first tab in the first direction near one end of the second electrode lead-out piece, so that the minimum distance between the second part of the first electrode lead-out piece and the second part of the second electrode lead-out piece in the first direction is the closest distance between the part of the first electrical connection structure formed by the first electrode lead-out piece and the first tab inside the first shell wall and the part of the second electrical connection structure formed by the second electrode lead-out piece and the second tab inside the first shell wall, and therefore, by limiting the above distance, the reliability of electrical insulation inside the first shell wall is improved, thereby reducing the mutual influence between the first electrical connection structure and the second electrical connection structure, and further improving the performance of the battery monomer.

[0023] In some embodiments, the distance between the center axis of the first part of the first electrode lead-out piece and the center axis of the first part of the second electrode lead-out piece in the first direction is not greater than 100mm.

[0024] By limiting the distance between the center axis of the first part of the first electrode lead-out piece and the center axis of the first part of the second electrode lead-out piece in the first direction, the first electrode lead-out piece and the second electrode lead-out piece are arranged more compactly, which is beneficial to improving the structural strength of the first shell wall, and the continuous space on the inside and outside of the first shell wall is larger, which is beneficial to the arrangement of other components, and further improves the volumetric energy density of the battery monomer.

[0025] In some embodiments, the minimum distance between the first part of the first electrode lead-out piece and the first part of the second electrode lead-out piece in the first direction is not less than 2mm.

[0026] In this way, the minimum distance between the first part of the first electrode lead-out piece and the first part of the second electrode lead-out piece in the first direction is limited to a range of not less than 2mm, which improves the reliability of electrical insulation between the first part of the first electrode lead-out piece and the first part of the second electrode lead-out piece, thereby reducing the probability of mutual influence between the first electrode lead-out piece and the second electrode lead-out piece, and further improving the performance of the battery monomer.

[0027] In some embodiments, the end face of the electrode terminal of each electrode lead-out piece away from the accommodation cavity is a first end face, and the end face near the accommodation cavity is a second end face, and the area of the second end face is smaller than the area of the first end face.

[0028] The first end face is an outer end face of the electrode terminal and is used for welding with the busbar structure, and the second end face is an inner end face of the electrode terminal and is used for welding with the adapter piece. During the grouping of the battery monomer, the first end face needs to be welded with another battery monomer to ensure the overcurrent, and thus a large welding area needs to be ensured. Therefore, the area of the first end face needs to be set to be relatively large, and the area of the second end face can be set to be relatively small to ensure the welding area with the adapter piece.

[0029] In some embodiments, along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 20% to 150%.

[0030] In this way, by limiting the ratio of the size of the second end face to the size of the first end face along the first direction to the range of 20% to 150%, the welding areas at the first end face and the second end face can respectively meet the respective standards, thereby improving the charging and discharging efficiency of the battery monomer.

[0031] In some embodiments, along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 25% to 100%.

[0032] During the grouping of the battery monomer, the first end face needs to be welded with another battery monomer to ensure the overcurrent, and thus a large welding area needs to be ensured. Therefore, the area of the first end face needs to be set to be relatively large, and the area of the second end face can be set to be relatively small to ensure the welding area with the adapter piece. Therefore, by limiting the ratio of the size of the second end face to the size of the first end face along the first direction to the range of 25% to 100%, the area of the first end face is greater than the area of the second end face, thereby making the welding areas at the two end connections of the electrode terminal meet the respective overcurrent standards, thereby improving the charging and discharging efficiency of the battery monomer.

[0033] In some embodiments, along the first direction, the size of the first end face is in the range of 20 mm to 50 mm, and / or the size of the second end face is in the range of 10 mm to 30 mm.

[0034] In this way, by respectively limiting the size of the first end face and the size of the second end face, the welding areas at the two end connections of the electrode terminal can more favorably meet the respective overcurrent standards, thereby improving the charging and discharging efficiency of the battery monomer.

[0035] In some embodiments, along the first direction, the size of the first end face is in the range of 25 mm to 40 mm, and / or the size of the second end face is in the range of 10 mm to 25 mm.

[0036] Therefore, by further limiting the size of the first end face and the size of the second end face, the welding area of the two ends of the electrode terminal can meet the respective overcurrent standards, thereby improving the charging and discharging efficiency of the battery monomer.

[0037] In some embodiments, the dimension of the surface of the tab facing the first shell wall along the first direction is in the range of 25mm-65mm.

[0038] Therefore, by limiting the dimension of the surface of the tab facing the first shell wall along the first direction to be in the range of 25mm-65mm, the welding area between the tab and the electrode lead can be in an appropriate range, and the space occupied is not too large, thereby facilitating the increase of the continuous space and improving the volumetric energy density of the battery monomer.

[0039] In some embodiments, the dimension of the surface of the tab facing the first shell wall along the first direction is in the range of 30mm-50mm.

[0040] Therefore, by limiting the dimension of the surface of the tab facing the first shell wall along the first direction to be in the range of 30mm-50mm, the welding area between the tab and the electrode lead can be in an appropriate range, and the space occupied is not too large, thereby facilitating the increase of the continuous space and improving the volumetric energy density of the battery monomer.

[0041] In some embodiments, along the first direction, the midpoint between the center axis of the first part of the first electrode lead and the center axis of the first part of the second electrode lead deviates from the center of the first shell wall.

[0042] Therefore, the continuous space of the first shell wall on the side opposite to the first electrode lead and the second electrode lead is larger, thereby facilitating the arrangement of other components and improving the volumetric energy density of the battery monomer.

[0043] In some embodiments, along the first direction, the distance between the midpoint between the center axis of the first part of the first electrode lead and the center axis of the first part of the second electrode lead and the center of the first shell wall is not greater than 47.5% of the size of the first shell wall.

[0044] Thus, the ratio of the distance between the midpoint between the center axes of the first part of the first electrode tab and the first part of the second electrode tab and the center of the first shell wall along the first direction and the size of the first shell wall is limited to a range of no more than 47.5%, so that the end of the first shell wall close to the deviated direction is sufficient to mount the first electrode tab and the second electrode tab, and the continuous space of the first shell wall on the side opposite to the deviated direction of the first electrode tab and the second electrode tab is larger, thereby facilitating the arrangement of other components and more facilitating the improvement of the volumetric energy density of the battery cell.

[0045] In some embodiments, the ratio of the distance between the midpoint between the center axes of the first part of the first electrode tab and the first part of the second electrode tab and the center of the first shell wall along the first direction and the size of the first shell wall is in a range of 40% to 47.5%.

[0046] Thus, the ratio of the distance between the midpoint between the center axes of the first part of the first electrode tab and the first part of the second electrode tab and the center of the first shell wall along the first direction and the size of the first shell wall is limited to a range of 40% to 47.5%, so that the end of the first shell wall close to the deviated direction is sufficient to mount the first electrode tab and the second electrode tab, and the continuous space of the first shell wall on the side opposite to the deviated direction of the first electrode tab and the second electrode tab is larger, thereby facilitating the arrangement of other components and more facilitating the improvement of the volumetric energy density of the battery cell.

[0047] In some embodiments, the distance between the center axis of the first part and the edge of the end of the extension part away from the body part of the same electrode tab along the first direction is in a range of 30mm to 80mm.

[0048] Thus, by limiting the distance between the center axis of the first part and the edge of the end of the extension part away from the body part of the same electrode tab along the first direction to a range of 30mm to 80mm, the second part of the electrode tab has a sufficiently large welding area, thereby improving the welding area of the second part and the tab, improving the reliability of the electrical connection, and improving the performance of the battery cell.

[0049] In some embodiments, the distance between the center axis of the first part and the edge of the end of the extension part away from the body part of the same electrode tab along the first direction is in a range of 40mm to 60mm.

[0050] Therefore, by limiting the distance between the center axis of the first part and the edge of the one end of the extension part away from the body part in the first direction in the electrode lead-out piece to be within the range of 40mm to 60mm, the second part of the electrode lead-out piece has a large enough welding area, so that the welding area of the second part and the tab is increased, and the reliability of the electrical connection is improved. In addition, the electrode lead-out piece does not occupy too much space in the first direction, which is beneficial to improving the volumetric energy density.

[0051] A second aspect of the present disclosure provides a battery, comprising at least one battery cell as described above.

[0052] Since the battery comprises the battery cell, the battery has all the beneficial effects of the battery cell, so that the battery has high structural strength and high volumetric energy density.

[0053] A third aspect of the present disclosure provides an energy storage device, comprising at least one battery cell as described above or the battery as described above.

[0054] Since the energy storage device comprises the battery cell or the battery, the energy storage device has all the beneficial effects of the battery cell or the battery, so that the energy storage device has high structural strength and is beneficial to reducing the accommodation space of the energy storage device for accommodating the battery cell or the battery, or the energy storage device can accommodate a battery cell or a battery with larger capacity in a limited accommodation space.

[0055] A fourth aspect of the present disclosure provides an electric device, comprising the battery cell as described above or the battery as described above for providing electrical energy.

[0056] Since the electric device comprises the battery cell or the battery, the electric device has all the beneficial effects of the battery cell or the battery, so that the electric device has high structural strength and is beneficial to reducing the accommodation space of the electric device for accommodating the battery cell or the battery, or the electric device can accommodate a battery cell or a battery with larger capacity in a limited accommodation space.

[0057] Therefore, the battery cell, the battery, the energy storage device and the electric device with high volumetric energy density and high structural strength can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0058] FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present disclosure;

[0059] FIG. 2 is a perspective exploded schematic diagram of a battery provided by some embodiments of the present disclosure;

[0060] FIG. 3 is a perspective structural schematic diagram of a battery cell provided by some embodiments of the present disclosure;

[0061] FIG. 4 is a top view of a battery cell provided by some embodiments of the present disclosure;

[0062] Fig. 5 is a sectional view at A-A in Fig. 4;

[0063] Fig. 6 is an enlarged view at A in Fig. 5;

[0064] Fig. 7 is a perspective exploded schematic view of a battery cell according to some embodiments of the present disclosure;

[0065] Fig. 8 is a partial sectional view of another structure of a battery cell according to some embodiments of the present disclosure;

[0066] Fig. 9 is a top view of still another structure of a battery cell according to some embodiments of the present disclosure;

[0067] Fig. 10 is a partial sectional view of a battery cell according to the prior art.

[0068] Explanation of Reference Numerals

[0069] 1000 vehicle; 100 battery; 10 battery case; 101 case cover; 102 case body; 200 controller; 300 motor; 20 battery cell; 1 housing; 11 first housing wall; 111 terminal mounting hole; 2 electrode assembly; 21 first tab; 22 second tab; 3a first electrode lead-out piece; 3b second electrode lead-out piece; 30 electrode terminal; 31 first portion; 3111 first end surface; 32 intermediate portion; 33 second portion; 3311 body portion; 3312 extension portion; 3313 second end surface; 311 terminal plate; 3110 through hole; 312 terminal disc; 313 connecting post; 314 adapter piece; 4 insulating structure; 5 insulating piece. DETAILED DESCRIPTION

[0070] It should be noted that the embodiments in the present disclosure and the technical features in the embodiments can be combined with each other without conflict, and the detailed description in the specific embodiments should be understood as an explanation and illustration of the purpose of the present disclosure, and should not be regarded as an improper limitation of the present disclosure.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms "include" and "have" and any variations thereof used in the specification and the above description of the drawings are intended to cover the non-exclusive inclusion.

[0072] In the description of the present disclosure, the technical terms "first", "second", "third", "fourth" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0073] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0074] In the description of the disclosure, the term“and / or” is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character“ / ” herein generally represents that the front and rear associated objects are“or” relationship.

[0075] In the description of the embodiments of the disclosure, the technical terms“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“circumferential” and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the disclosure and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, be operated or used, and therefore cannot be understood as a limitation on the embodiments of the disclosure.

[0076] In the description of the disclosure, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the disclosure can be understood according to the specific circumstances.

[0077] In the description of the disclosure, unless otherwise explicitly specified and limited, the technical term“contact” should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, which can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0078] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms“parallel” and“perpendicular” both allow a certain degree of tolerance and / or error, including approximately parallel and approximately perpendicular.

[0079] Next, the disclosure will be described in detail.

[0080] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0081] In the embodiments of the present disclosure, the battery comprises a battery cell.

[0082] The inventors of the present disclosure find that at present, the end cover of the battery cell is provided with two pole posts, the two pole posts are connected to two pole lugs respectively through two adapter pieces, the two pole lugs are arranged on the side of the two pole posts facing each other, the two adapter pieces extend from one end of the respective connecting pole post in the direction facing each other, and the end of the two adapter pieces close to each other is connected to the pole lug, that is, the two adapter pieces are arranged facing each other, so that the space occupied by the two adapter pieces in the spacing direction of the two pole posts is relatively large, the spacing between the two pole posts is relatively large, the structural strength of the end cover is relatively low, and the continuous space of the end cover is relatively small, which is not conducive to the arrangement of other parts and easily affects the volumetric energy density of the battery cell.

[0083] The inventors of the present disclosure find that changing the facing arrangement of the two adapter pieces to the forward arrangement is conducive to the close arrangement between the pole posts, and limits the spacing between the pole posts to a relatively small range, so that the pole posts are arranged more concentratedly, which is conducive to improving the structural strength of the end cover, and the continuous space of the end cover is relatively large, which is conducive to the arrangement of other parts, and further conducive to improving the volumetric energy density of the battery cell.

[0084] Based on such design concept, the inventor of the present disclosure designs a battery monomer, which comprises a shell, an electrode assembly and at least two electrode lead-out pieces, the shell has a first shell wall and a containing cavity; the electrode assembly is arranged in the containing cavity, and the electrode assembly has at least two tabs, including a first tab and a second tab; the at least two electrode lead-out pieces include a first electrode lead-out piece and a second electrode lead-out piece, which are arranged on the first shell wall and arranged along a first direction, each electrode lead-out piece includes a first part located on the outside of the shell, a second part located on the inside of the shell, and an intermediate part connected between the first part and the second part, the second part of the first electrode lead-out piece is connected with the first tab, and the second part of the second electrode lead-out piece is connected with the second tab, in the first direction, the ratio of the distance between the center axis of the first part of the first electrode lead-out piece and the center axis of the first part of the second electrode lead-out piece to the size of the first shell wall is not greater than 60%, and the second part of each electrode lead-out piece includes a body part coinciding with the first part in the thickness direction of the first shell wall and an extension part extending beyond the first part in the first direction, the extension part of the first electrode lead-out piece is located on the side of the body part of the first electrode lead-out piece facing the second electrode lead-out piece, and the extension part of the second electrode lead-out piece is located on the side of the body part of the second electrode lead-out piece away from the first electrode lead-out piece.

[0085] The extension part of the second part of the first electrode lead-out piece and the extension part of the second part of the second electrode lead-out piece of the present disclosure extend to the same side from the body part connected thereto, that is, the second part of the first electrode lead-out piece and the second part of the second electrode lead-out piece are arranged in the same direction, which is beneficial to the setting of a relatively small distance between the first part of the first electrode lead-out piece and the first part of the second electrode lead-out piece, and the present disclosure further limits the ratio of the distance between the center axis of the first part of the first electrode lead-out piece and the center axis of the first part of the second electrode lead-out piece to the size of the first shell wall to be not greater than 60%, so that the two electrode lead-out pieces are arranged more concentratedly, which is beneficial to improving the structural strength of the first shell wall, and the continuous space of the inside and outside of the first shell wall is relatively large, which is beneficial to the arrangement of other components, and further beneficial to improving the volumetric energy density of the battery monomer.

[0086] The battery monomer provided by the embodiment of the present disclosure can be used in an electric device or an energy storage device, but is not limited to this. The electric device can be, but is not limited to, a vehicle, a ship or an aircraft, etc. For example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0087] The present disclosure also provides a battery, which can include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection through a busbar.

[0088] In embodiments of the present disclosure, the plurality is two or more.

[0089] In some embodiments of the present disclosure, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0090] In some embodiments of the present disclosure, the battery can be a battery pack, and the battery pack includes a battery box and battery cells, and the battery cells or battery modules are accommodated in the battery box.

[0091] In some embodiments of the present disclosure, the battery box can be part of the chassis structure of the vehicle. For example, part of the battery box can be at least part of the floor of the vehicle, or part of the battery box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0092] The battery provided by the embodiments of the present disclosure can be used in, but is not limited to, an electric device or an energy storage device. The electric device can be, but is not limited to, a vehicle, a ship, or an aircraft, etc. For example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship, and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0093] The embodiments of the present disclosure also provide an energy storage device. The energy storage device includes a battery cell or a battery.

[0094] The energy storage device provided by the embodiments of the present disclosure can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0095] The embodiments of the present disclosure also provide an electric device. The electric device includes a battery cell or a battery for providing electric energy.

[0096] The electric device provided by the embodiments of the present disclosure can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0097] In the following embodiments, for the convenience of description, the electric device of an embodiment of the present disclosure is taken as a vehicle 1000 for example. The following is described with reference to the accompanying drawings.

[0098] FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present disclosure.

[0099] The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. As shown in FIG. 1, the vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0100] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0101] FIG. 2 is a perspective exploded schematic diagram of the battery 100 according to some embodiments of the present disclosure.

[0102] As shown in FIG. 2, the battery 100 includes a battery box 10 and at least one battery cell 20, and the battery box 10 is internally provided with an accommodating space, and the at least one battery cell 20 is accommodated in the accommodating space.

[0103] In some embodiments of the present disclosure, the battery box 10 includes a box body 102 and a box cover 101, and the box cover 101 covers the box body 102, so as to form the accommodating space between the box body 102 and the box cover 101.

[0104] The box body 102 can be a hollow structure with one end open, and the box cover 101 can be a plate-shaped structure, which is combined with the open side of the box body 102 to define the accommodating space together with the box body 102; or the box cover 101 and the box body 102 can both be hollow structures with one side open, and the open side of the box cover 101 is combined with the open side of the box body 102. Of course, the battery box 10 formed by the box cover 101 and the box body 102 can have various shapes, such as a cylinder, a cuboid, etc.

[0105] In the battery 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series or in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is placed in the accommodating space formed by the box body 102 and the box cover 101. Of course, the battery 100 can also be in the form that the multiple battery cells 20 are connected in series or in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole, and are accommodated in the accommodating space formed by the box body 102 and the box cover 101. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0106] In the embodiments of the present disclosure, the battery cell 20 can be a secondary battery, which means that the battery cell can be activated by charging after discharging to continue to be used.

[0107] The battery cell 20 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., and the embodiments of the present disclosure are not limited thereto.

[0108] The battery cell 20 can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery, for example, a hexagonal prismatic battery, etc., and the present disclosure is not particularly limited.

[0109] In the following, some embodiments of the present disclosure will be described in detail with reference to FIGS. 3 to 10.

[0110] FIG. 3 is a perspective structural schematic view of a battery cell according to some embodiments of the present disclosure; FIG. 4 is a top view of a battery cell according to some embodiments of the present disclosure; FIG. 5 is a sectional view of A-A in FIG. 4; FIG. 6 is an enlarged view of A in FIG. 5; FIG. 7 is a perspective exploded schematic view of a battery cell according to some embodiments of the present disclosure; FIG. 8 is a partial sectional view of another structure of a battery cell according to some embodiments of the present disclosure; FIG. 9 is a top view of still another structure of a battery cell according to some embodiments of the present disclosure; and FIG. 10 is a partial sectional view of a battery cell in the prior art.

[0111] In the description of the embodiments of the present disclosure, the length direction of the first shell wall is represented by the direction of the arrow X; the width direction of the first shell wall is represented by the direction of the arrow Y; and the wall thickness direction of the first shell wall is represented by the direction of the arrow Z.

[0112] The first aspect of the present disclosure provides a battery cell 20, as shown in FIGS. 3-6, comprising a housing 1, an electrode assembly 2, and at least two electrode tabs, the housing 1 having a first housing wall 11 and a receiving cavity; the electrode assembly 2 being disposed in the receiving cavity, the electrode assembly 2 having at least two tabs, the at least two tabs comprising a first tab 21 and a second tab 22; the at least two electrode tabs comprising a first electrode tab 3a and a second electrode tab 3b, each disposed on the first housing wall 11 and arranged along a first direction, each electrode tab comprising a first portion 31 located outside the housing 1, a second portion 33 located inside the housing 1, and an intermediate portion 32 connecting the first portion 31 and the second portion 33, the second portion 33 of the first electrode tab 3a being connected to the first tab 21, the second portion 33 of the second electrode tab 3b being connected to the second tab 22, in the first direction, a ratio of a distance L1 between a center axis of the first portion 31 of the first electrode tab 3a and a center axis of the first portion 31 of the second electrode tab 3b to a size L2 of the first housing wall 11 being not greater than 60%, the second portion 33 of each electrode tab comprising a body portion 3311 coinciding with the first portion 31 in a thickness direction Z of the first housing wall 11 and an extension portion 3312 extending beyond the first portion 31 along the first direction, the extension portion 3312 of the first electrode tab 3a being located on a side of the body portion 3311 of the first electrode tab 3a facing the second electrode tab 3b, the extension portion 3312 of the second electrode tab 3b being located on a side of the body portion 3311 of the second electrode tab 3b facing away from the first electrode tab 3a.

[0113] The electrode assembly 2 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 2 can be contained in the housing 1. The electrode assembly 2 includes a positive electrode sheet, a negative electrode sheet, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted into and extracted from between the positive electrode and the negative electrode. The separator is disposed between the positive electrode sheet and the negative electrode sheet, and can function to prevent short-circuiting between the positive and negative electrodes while allowing the active ions to pass through. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 2, and portions without active materials that constitute a positive electrode tab and a negative electrode tab, respectively. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body, respectively. During charging and discharging of the battery, the positive active material and the negative active material react with the electrolyte.

[0114] As shown in FIG. 3, the housing 1 has a plurality of housing walls, one of which is designated as the first housing wall 11 for ease of description. The electrode assembly 2 is located in a receiving cavity surrounded by the plurality of housing walls.

[0115] In some embodiments, the shell 1 is used to encapsulate the electrode assembly 2 and electrolyte and the like. The shell 1 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film, or the like.

[0116] In some embodiments, the shell 1 can be a sealed structure or a non-sealed structure. As an example, when the shell 1 is a non-sealed structure, the shell 1 serves to protect the electrode assembly, and a sealing bag is further included between the shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell (such as a hexagonal prismatic battery cell), and the like. In the embodiments shown in FIGS. 3-9, a square shell battery cell is taken as an example for illustration.

[0117] In some embodiments, as shown in FIGS. 3-5, the shell 1 includes a plurality of shell walls, and a portion of the shell walls enclose a space with an opening, which can be closed by another shell wall (such as the first shell wall 11) to form a receiving cavity for receiving the electrode assembly 2 and the electrolyte and the like. The shell 1 can be provided with one or more openings. The shell wall (such as the first shell wall 11) that closes the opening can also be configured as a top cover.

[0118] As shown in FIGS. 5-9, for the convenience of illustration, in the embodiments of the present disclosure, the shell wall where the first electrode lead-out member 3a and the second electrode lead-out member 3b are located is referred to as the first shell wall 11. The first electrode lead-out member 3a and the second electrode lead-out member 3b are arranged on the first shell wall 11, and the first electrode lead-out member 3a and the second electrode lead-out member 3b are connected with the tab of the electrode assembly 2 to lead the current in or out of the electrode assembly 2.

[0119] Optionally, the electrode lead-out member can be two, three, or four, or the like. The electrode lead-out member can be located at the center of the first shell wall 11, or can be located at a position deviated from the center to one end of the first shell wall 11.

[0120] The first shell wall 11 has a dimension along the length direction X greater than a dimension along the width direction Y. The first direction in which the first electrode lead 3a and the second electrode lead 3b are spaced apart can coincide with the length direction X of the first shell wall 11, can coincide with the width direction of the first shell wall 11, or can cross both the length direction X and the width direction Y of the first shell wall 11. In addition, the arrangement of the first electrode lead 3a and the second electrode lead 3b can be an arrangement in which the first electrode lead 3a and the second electrode lead 3b are aligned with each other along the first direction, i.e., the projections along the first direction are completely coincident, or can be an arrangement in which the first electrode lead 3a and the second electrode lead 3b are arranged along the first direction and are misaligned with each other along a direction perpendicular to the first direction, i.e., the projections along the first direction are partially overlapped or not overlapped. In the present disclosure, as a specific example, the arrangement in which the first electrode lead 3a and the second electrode lead 3b are aligned with each other along the first direction is described as an example, and for ease of description, the present disclosure is described as an example in which the first direction coincides with the length direction X of the first shell wall 11.

[0121] The first portion 31 is a portion of the electrode lead that protrudes outside the housing 1 beyond the outer surface of the first shell wall 11. As shown in FIG. 4, the ratio of the spacing L1 between the center axis of the first portion 31 of the first electrode lead 3a and the center axis of the first portion 31 of the second electrode lead 3b along the first direction to the dimension L2 of the first shell wall 11 is not greater than 60%, so that the first electrode lead 3a and the second electrode lead 3b are arranged relatively compactly.

[0122] For example, the ratio of the spacing L1 between the center axis of the first portion 31 of the first electrode lead 3a and the center axis of the first portion 31 of the second electrode lead 3b along the first direction to the dimension L2 of the first shell wall 11 can be, but is not limited to, 0.5%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60%.

[0123] As shown in FIG. 6, the extension part 3312 of the second part 33 of the first electrode lead-out piece 3a and the extension part 3312 of the second part 33 of the second electrode lead-out piece 3b extend from the body part 3311 connected thereto to the same side, that is, the second part 33 of the first electrode lead-out piece 3a and the second part 33 of the second electrode lead-out piece 3b are arranged in the same direction, which is advantageous for reducing the distance between the first part 31 of the first electrode lead-out piece 3a and the first part 31 of the second electrode lead-out piece 3b. Moreover, as shown in FIG. 4, the present disclosure also limits the ratio of the distance L1 between the center axis of the first part 31 of the first electrode lead-out piece 3a and the center axis of the first part 31 of the second electrode lead-out piece 3b to the size L2 of the first shell wall 11 to a certain range, so that the first electrode lead-out piece 3a and the second electrode lead-out piece 3b are arranged more concentratedly, which is advantageous for improving the structural strength of the first shell wall 11, and the continuous space on the inside and outside of the first shell wall 11 is relatively large, which is advantageous for the arrangement of other components, and further advantageous for improving the volumetric energy density of the battery monomer 20.

[0124] In some embodiments, as shown in FIG. 6 and FIG. 7, each electrode lead-out piece includes an electrode terminal 30 passing through the terminal mounting hole 111 of the first shell wall 11 and a transition piece 314 connected to one end of the electrode terminal 30 located in the accommodation cavity, the part of the electrode terminal 30 located outside the shell 1 is the first part 31, the part located in the terminal mounting hole 111 is the intermediate part 32, and the part of the electrode terminal 30 located inside the shell 1 and the transition piece 314 form the second part 33.

[0125] For example, the end of the electrode terminal 30 located in the accommodation cavity is welded with the transition piece 314. The transition piece 314 is welded with the tab.

[0126] It can be understood that the first electrode lead-out piece 3a includes an electrode terminal 30 passing through the terminal mounting hole 111 of the first shell wall 11 and a transition piece 314 connected to one end of the electrode terminal 30 located in the accommodation cavity. Similarly, the second electrode lead-out piece 3b includes an electrode terminal 30 passing through the terminal mounting hole 111 of the first shell wall 11 and a transition piece 314 connected to one end of the electrode terminal 30 located in the accommodation cavity, and the transition piece 314 of the first electrode lead-out piece 3a and the transition piece 314 of the second electrode lead-out piece 3b are arranged in the same direction.

[0127] In this way, the electrode terminal 30 and the transition piece 314 are connected to form an electrode lead-out piece for leading in or out of current. Moreover, the first electrode lead-out piece 3a and the second electrode lead-out piece 3b are arranged more concentratedly, which is advantageous for improving the structural strength of the first shell wall 11, and the continuous space on the inside and outside of the first shell wall 11 is relatively large, which is advantageous for the arrangement of other components, and further advantageous for improving the volumetric energy density of the battery monomer 20.

[0128] In some embodiments, as shown in FIG. 7, each electrode terminal 30 includes a terminal disc 312, a terminal plate 311, and a connecting post 313. The terminal disc 312 is located on the inner side of the first shell wall 11 and connected to the adapter tab 314. The terminal plate 311 is located on the outer side of the first shell wall 11. One end of the connecting post 313 is connected to the terminal disc 312 and formed as one body. The connecting post 313 passes through the terminal mounting hole 111. The terminal plate 311 is formed with a through hole 3110. The end of the connecting post 313 away from the terminal disc 312 is riveted to the terminal plate 311 through the through hole 3110. The terminal disc 312 is the part of the electrode terminal 30 that protrudes beyond the inner surface of the first shell wall 11. The adapter tab 314 is located inside the first shell wall 11. Therefore, the terminal disc 312 and the adapter tab 314 in FIG. 7 are connected to form the second part 33 in FIG. 6. The part of the adapter tab 314 in FIG. 7 that coincides with the terminal plate 311 in the wall thickness direction Z of the first shell wall 11 and the terminal disc 312 forms the body part 3311 in FIG. 6. The part of the adapter tab 314 in FIG. 7 that protrudes beyond the edge of the terminal plate 311 in the first direction is the extension part 3312 in FIG. 6. The part of the connecting post 313 in FIG. 7 that is located inside the terminal mounting hole 111 is the intermediate part 32 in FIG. 6. The part of the connecting post 313 in FIG. 7 that passes into the through hole 3110 of the terminal plate 311 is located on the outer side of the first shell wall 11 together with the terminal plate 311. That is, the structure formed by the part of the connecting post 313 in FIG. 7 that passes into the through hole 3110 of the terminal plate 311 and the terminal plate 311 is the first part 31 in FIG. 6.

[0129] The terminal plate 311 is used to electrically connect with the busbar structure, which can realize the electrical connection between the battery monomers 20. The terminal plate 311 can be made of metal, such as copper, aluminum, etc. Optionally, the terminal plate 311 is formed as a generally flat plate. The shape of the flat plate can be designed according to the situation, for example, it can be circular, square as shown in FIG. 7, etc.

[0130] The electrode terminal 30 can improve the heat dissipation, the supporting effect on the first shell wall 11, and the connection strength with the busbar structure by designing the terminal plate 311 to be larger.

[0131] The terminal disc 312 can be made of metal, such as copper, aluminum, etc. Optionally, the terminal disc 312 is formed as a generally flat plate. The shape of the flat plate can be designed according to the situation, for example, it can be circular, square as shown in FIG. 7, etc.

[0132] Since the electrode terminal 30 includes the terminal disc 312 located in the first shell wall 11, the electrode terminal 30 can be easily connected with the tab of the electrode assembly 2 through the terminal disc 312. The terminal plate 311 and the terminal disc 312 each have a high degree of freedom in shape design. Moreover, the terminal plate 311 and the terminal disc 312 respectively sandwich the first shell wall 11 from the inner and outer sides of the outer shell 1, and the bending strength of the first shell wall 11 can be improved.

[0133] As shown in FIG. 7, the terminal plate 311 and the terminal disc 312 are connected through the connecting column 313. The shape, size or number of the connecting column 313 is not limited as long as the connection of the terminal plate 311 and the terminal disc 312 can be achieved. In a specific embodiment, the connecting column 313 is cylindrical.

[0134] In some embodiments, as shown in FIG. 7, an insulating structure 4 is arranged between the terminal plate 311 and the first shell wall 11.

[0135] The insulating structure 4 and the terminal plate 311 are fixed to each other in a manner of integrally injection molding, bonding, fastening together through the connecting column 313, etc.

[0136] In some embodiments, an insulating piece 5 can also be arranged on the inner side of the first shell wall 11. The insulating piece 5 can be used to isolate the electrical connection components in the outer shell 1 from the first shell wall 11, so as to reduce the risk of short circuit. For example, the insulating piece 5 can be plastic, rubber, etc.

[0137] In some embodiments of the present disclosure, the second part 33 is an integrally formed structure.

[0138] As shown in FIG. 8, the second part 33 is an integrally formed structure, so that the structural strength of the electrode lead-out piece is high, and the time occupied by the assembly of the split structure is also reduced.

[0139] In some embodiments of the present disclosure, one of the first tab 21 and the second tab 22 is a positive electrode tab, and the other is a negative electrode tab.

[0140] In this way, one of the first electrode lead-out piece 3a and the second electrode lead-out piece 3b is a positive electrode terminal, and the other is a negative electrode terminal. Moreover, the structural strength of the battery monomer 20 is high, and the volumetric energy density is high.

[0141] In some embodiments of the present disclosure, the first tab 21 and the second tab 22 are both positive electrode tabs, or the first tab 21 and the second tab 22 are both negative electrode tabs.

[0142] In this way, the first electrode lead-out piece 3a and the second electrode lead-out piece 3b are terminals of the same polarity, both positive electrode terminals or both negative electrode terminals. Moreover, the structural strength of the battery monomer 20 is high, and the volumetric energy density is high.

[0143] In some embodiments of the present disclosure, the first tab 21 and the second tab 22 are formed integrally.

[0144] In this way, the first tab 21 and the second tab 22 are formed integrally, which is conducive to the first electrode lead-out piece 3a and the second electrode lead-out piece 3b being closer to each other, and is conducive to improving the structural strength of the first shell wall 11, and making the continuous space on the inner and outer sides of the first shell wall 11 larger, thereby facilitating the arrangement of other components, and further improving the volumetric energy density of the battery monomer 20.

[0145] In some embodiments of the present disclosure, the first tab 21 and the second tab 22 are arranged in a spaced manner.

[0146] For example, one of the first tab 21 and the second tab 22 is a positive electrode tab, and the other is a negative electrode tab, and the first tab 21 and the second tab 22 are arranged in a spaced manner.

[0147] For example, the first tab 21 and the second tab 22 are both positive electrode tabs, or the first tab 21 and the second tab 22 are both negative electrode tabs, and the first tab 21 and the second tab 22 are arranged in a spaced manner.

[0148] In this way, the first tab 21 and the second tab 22 do not affect each other, and the first electrode lead-out piece 3a and the second electrode lead-out piece 3b are connected to the first tab 21 and the second tab 22 respectively, so that the first electrode lead-out piece 3a and the second electrode lead-out piece 3b do not affect each other.

[0149] In some embodiments of the present disclosure, as shown in FIG. 6, the second part 33 of the first electrode lead-out piece 3a is arranged to extend beyond the edge of the first tab 21 along the first direction near one end of the second electrode lead-out piece 3b, and the minimum distance L3 between the second part 33 of the first electrode lead-out piece 3a and the second part 33 of the second electrode lead-out piece 3b in the first direction is not less than 5 mm.

[0150] For example, the minimum distance L3 between the second part 33 of the first electrode lead-out piece 3a and the second part 33 of the second electrode lead-out piece 3b in the first direction can be, but is not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm.

[0151] The second part 33 of the first electrode lead-out piece 3a protrudes beyond the edge of the first tab 21 in the first direction near one end of the second electrode lead-out piece 3b, so that the minimum distance L3 in the first direction between the second part 33 of the first electrode lead-out piece 3a and the second part 33 of the second electrode lead-out piece 3b is the closest distance between the part of the first electrical connection structure formed by the first electrode lead-out piece 3a and the first tab 21 inside the first shell wall 11 and the part of the second electrical connection structure formed by the second electrode lead-out piece 3b and the second tab 22 inside the first shell wall 11. Therefore, by limiting the above distance L3, the reliability of electrical insulation inside the first shell wall 11 is improved, thereby reducing the probability of mutual influence between the first electrical connection structure and the second electrical connection structure, and further improving the performance of the battery monomer 20.

[0152] In some embodiments of the present disclosure, as shown in FIG. 4, the distance L1 between the center axis of the first part 31 of the first electrode lead-out piece 3a and the center axis of the first part 31 of the second electrode lead-out piece 3b in the first direction is not greater than 100 mm.

[0153] For example, the distance L1 between the center axis of the first part 31 of the first electrode lead-out piece 3a and the center axis of the first part 31 of the second electrode lead-out piece 3b in the first direction can be, but is not limited to, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, or 100 mm.

[0154] By limiting the range of the distance L1 between the center axis of the first part 31 of the first electrode lead-out piece 3a and the center axis of the first part 31 of the second electrode lead-out piece 3b in the first direction, the first electrode lead-out piece 3a and the second electrode lead-out piece 3b are arranged relatively compactly, which is beneficial to improving the structural strength of the first shell wall 11, and the continuous space on the inside and outside of the first shell wall 11 is relatively large, which is beneficial to the arrangement of other components, and further beneficial to improving the volumetric energy density of the battery monomer 20.

[0155] In some embodiments of the present disclosure, as shown in FIG. 6, the minimum distance L4 between the first part 31 of the first electrode lead-out piece 3a and the first part 31 of the second electrode lead-out piece 3b in the first direction is not less than 2 mm.

[0156] The minimum distance L4 between the first part 31 of the first electrode lead-out piece 3a and the first part 31 of the second electrode lead-out piece 3b in the first direction being not less than 2 mm means that the distance between the edge of the first part 31 of the first electrode lead-out piece 3a near the second electrode lead-out piece 3b and the edge of the first part 31 of the second electrode lead-out piece 3b near the first electrode lead-out piece 3a is not less than 2 mm.

[0157] Exemplarily, the minimum interval L4 of the first part 31 of the first electrode lead-out piece 3a and the first part 31 of the second electrode lead-out piece 3b along the first direction can be, but is not limited to, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, or 4 mm.

[0158] Thus, the minimum interval L4 of the first part 31 of the first electrode lead-out piece 3a and the first part 31 of the second electrode lead-out piece 3b along the first direction is limited in the range of no less than 2 mm, the reliability of mutual electrical insulation between the first part 31 of the first electrode lead-out piece 3a and the first part 31 of the second electrode lead-out piece 3b is improved, thereby reducing the probability of mutual influence between the first electrode lead-out piece 3a and the second electrode lead-out piece 3b, and further improving the performance of the battery monomer 20.

[0159] In some embodiments of the present disclosure, as shown in FIG. 6, the end face of the electrode terminal 30 of each electrode lead-out piece away from the accommodating cavity is a first end face 3111, the end face of the electrode terminal 30 close to the accommodating cavity is a second end face 3313, and the area of the second end face 3313 is smaller than the area of the first end face 3111.

[0160] Specifically, as shown in FIG. 7, the electrode terminal 30 includes a terminal plate 311, a connecting column 313, and a terminal disc 312 connected in sequence. The part of the connecting column 313 in the through hole 3110 of the terminal plate 311 in FIG. 7 and the structure composed of the terminal plate 311 are the first part 31 in FIG. 6, that is, the outer end face of the connecting column 313 and the surface of the terminal plate 311 away from the accommodating cavity constitute the first end face 3111 in FIG. 6, and the area of the first end face 3111 in FIG. 7 is the area of the region surrounded by the outer edge of the surface of the terminal plate 311 away from the accommodating cavity. The second end face 3313 is the end face of the electrode terminal 30 close to the accommodating cavity, that is, the surface of the terminal disc 312 away from the connecting column 313 in FIG. 7.

[0161] The first end face 3111 is the outer end face of the electrode terminal 30, which is used for welding with the bus structure, and the second end face 3313 is the inner end face of the electrode terminal 30, which is used for welding with the adapter piece 314. Since the battery monomer 20 needs to be welded with the bus structure through the first end face 3111 to ensure overcurrent during the grouping process, a larger welding area is required, and thus the area of the first end face 3111 needs to be set relatively large, and the second end face 3313 with a smaller area can also ensure the welding area with the adapter piece 314.

[0162] In some embodiments of the present disclosure, as shown in FIG. 6, the ratio of the size L5 of the second end surface 3313 to the size L6 of the first end surface 3111 along the first direction is in the range of 20% to 150%.

[0163] It can be understood that the second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a satisfy the above size condition, i.e., the ratio of the size L5 of the second end surface 3313 of the electrode terminal 30 of the first electrode lead-out piece 3a to the size L6 of the first end surface 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a along the first direction is in the range of 20% to 150%. The second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b satisfy the above size condition, i.e., the ratio of the size L5 of the second end surface 3313 of the electrode terminal 30 of the second electrode lead-out piece 3b to the size L6 of the first end surface 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b along the first direction is in the range of 20% to 150%.

[0164] For example, the ratio of the size L5 of the second end surface 3313 to the size L6 of the first end surface 3111 of the electrode terminal 30 along the first direction can be, but is not limited to, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, 110%, 120%, 130%, 140%, or 150%.

[0165] In this way, by limiting the ratio of the size L5 of the second end surface 3313 to the size L6 of the first end surface 3111 along the first direction in the range of 20% to 150%, it is beneficial to make the solder print areas at the first end surface 3111 and the second end surface 3313 respectively reach the respective standards, thereby improving the charge and discharge efficiency of the battery monomer 20.

[0166] In some embodiments of the present disclosure, as shown in FIG. 6, the size L6 of the first end surface 3111 is greater than the size L5 of the second end surface 3313 along the first direction.

[0167] It can be understood that the second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a satisfy the above size condition, i.e., the size L6 of the first end surface 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a is greater than the size L5 of the second end surface 3313 of the electrode terminal 30 of the first electrode lead-out piece 3a along the first direction. The second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b satisfy the above size condition, i.e., the size L6 of the first end surface 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b is greater than the size L5 of the second end surface 3313 of the electrode terminal 30 of the second electrode lead-out piece 3b along the first direction.

[0168] Therefore, the area of the first end surface 3111 is greater than the area of the second end surface 3313, so that the soldering area of the two end connections of the electrode terminal 30 meets the respective overcurrent standards.

[0169] In some embodiments of the present disclosure, the ratio of the size L5 of the second end surface 3313 to the size L6 of the first end surface 3111 along the first direction is in the range of 25% to 100%.

[0170] It can be understood that the second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a meet the size condition described above, that is, the ratio of the size L5 of the second end surface 3313 of the electrode terminal 30 of the first electrode lead-out piece 3a to the size L6 of the first end surface 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a along the first direction is in the range of 25% to 100%. The second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b meet the size condition described above, that is, the ratio of the size L5 of the second end surface 3313 of the electrode terminal 30 of the second electrode lead-out piece 3b to the size L6 of the first end surface 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b along the first direction is in the range of 25% to 100%.

[0171] For example, the ratio of the size L5 of the second end surface 3313 to the size L6 of the first end surface 3111 along the first direction can be, but is not limited to, 25%, 35%, 45%, 55%, 65%, 75%, 85%, 95%, or 100%.

[0172] Since the battery monomer 20 needs to be welded with another battery monomer through the first end surface 3111 to ensure overcurrent during the grouping process, a larger soldering area is required, so the area of the first end surface 3111 needs to be set relatively large, and the area of the second end surface 3313 is set smaller to ensure the soldering area with the adapter piece 314. Therefore, by limiting the ratio of the size L5 of the second end surface 3313 to the size L6 of the first end surface 3111 along the first direction in the range of 25% to 100%, the area of the first end surface 3111 is greater than the area of the second end surface 3313, so that the soldering area of the two end connections of the electrode terminal meets the respective overcurrent standards, thereby improving the charging and discharging efficiency of the battery monomer 20.

[0173] In some embodiments of the present disclosure, the size L6 of the first end surface 3111 along the first direction is in the range of 20 mm to 50 mm, and / or the size L5 of the second end surface 3313 is in the range of 10 mm to 30 mm.

[0174] It can be understood that the second end face 3313 and the first end face 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a meet the above-mentioned size condition, that is, along the first direction, the size L6 of the first end face 3111 of the electrode terminal 30 of the first electrode lead-out piece 3a is in the range of 20mm-50mm, and / or the size L5 of the second end face 3313 of the electrode terminal 30 of the first electrode lead-out piece 3a is in the range of 10mm-30mm. The second end face 3313 and the first end face 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b meet the above-mentioned size condition, that is, along the first direction, the size L6 of the first end face 3111 of the electrode terminal 30 of the second electrode lead-out piece 3b is in the range of 20mm-50mm, and / or the size L5 of the second end face 3313 of the electrode terminal 30 of the second electrode lead-out piece 3b is in the range of 10mm-30mm.

[0175] For example, the size L6 of the first end face 3111 can be, but is not limited to, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm or 50mm. The size L5 of the second end face 3313 can be, but is not limited to, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm or 30mm.

[0176] In this way, by limiting the size L6 of the first end face 3111 and the size L5 of the second end face 3313 respectively, it is more conducive to making the welding area of the two ends of the electrode terminal 30 meet the respective overcurrent standards, thereby improving the charging and discharging efficiency of the battery monomer 20.

[0177] In some embodiments of the present disclosure, along the first direction, the size L6 of the first end face 3111 is in the range of 25mm-40mm, and / or the size L5 of the second end face 3313 is in the range of 10mm-25mm.

[0178] It can be understood that the second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the first electrode tab 3a satisfy the above-mentioned size condition, i.e., along the first direction, the size L6 of the first end surface 3111 of the electrode terminal 30 of the first electrode tab 3a is in the range of 25mm-40mm, and / or the size L5 of the second end surface 3313 of the electrode terminal 30 of the first electrode tab 3a is in the range of 10mm-25mm. The second end surface 3313 and the first end surface 3111 of the electrode terminal 30 of the second electrode tab 3b satisfy the above-mentioned size condition, i.e., along the first direction, the size L6 of the first end surface 3111 of the electrode terminal 30 of the second electrode tab 3b is in the range of 25mm-40mm, and / or the size L5 of the second end surface 3313 of the electrode terminal 30 of the second electrode tab 3b is in the range of 10mm-25mm.

[0179] In this way, by further limiting the value range of the size L6 of the first end surface 3111 and the size L5 of the second end surface 3313, it is more conducive to make the welding area of the two end connections of the electrode terminal 30 meet the respective overcurrent standards, thereby improving the charging and discharging efficiency of the battery monomer 20.

[0180] In some embodiments of the present disclosure, as shown in FIG. 6, the size L8 of the surface of the tab facing the first shell wall 11 along the first direction is in the range of 25mm-65mm.

[0181] It can be understood that both the first tab 21 and the second tab 22 satisfy the above-mentioned size condition, i.e., the size L8 of the surface of the first tab 21 facing the first shell wall 11 along the first direction is in the range of 25mm-65mm, and the size L8 of the surface of the second tab 22 facing the first shell wall 11 along the first direction is in the range of 25mm-65mm.

[0182] For example, the size L8 of the surface of the tab facing the first shell wall 11 along the first direction can be, but is not limited to, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36m, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, 63mm, 64mm, or 65mm.

[0183] Thus, by limiting the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction to the range of 25 mm to 65 mm, it is possible to keep the welding area between the tab and the electrode lead within an appropriate range without occupying too much space, thereby facilitating an increase in the continuous space and an improvement in the volumetric energy density of the battery cell 20.

[0184] In some embodiments of the present disclosure, the dimension of the surface of the tab facing the first housing wall 11 in the first direction is in the range of 30 mm to 50 mm.

[0185] It will be appreciated that both the first tab 21 and the second tab 22 satisfy the above-mentioned dimensional conditions, i.e., the dimension L8 of the surface of the first tab 21 facing the first housing wall 11 in the first direction is in the range of 30 mm to 50 mm, and the dimension L8 of the surface of the second tab 22 facing the first housing wall 11 in the first direction is in the range of 30 mm to 50 mm.

[0186] Thus, by limiting the dimension L8 of the surface of the tab facing the first housing wall 11 in the first direction to the range of 30 mm to 50 mm, it is possible to keep the welding area between the tab and the electrode lead within an appropriate range without occupying too much space, thereby facilitating an increase in the continuous space and an improvement in the volumetric energy density of the battery cell 20.

[0187] In some embodiments of the present disclosure, as shown in FIG. 9, the midpoint between the center axis of the first portion 31 of the first electrode lead 3a and the center axis of the first portion 31 of the second electrode lead 3b is disposed offset from the center of the first housing wall 11 in the first direction.

[0188] Thus, it is possible to make the continuous space of the first housing wall 11 on the side opposite to the first electrode lead 3a and the second electrode lead 3b larger, thereby facilitating the arrangement of other components and further facilitating an improvement in the volumetric energy density of the battery cell 20.

[0189] In some embodiments of the present disclosure, as shown in FIG. 9, the ratio of the distance between the midpoint between the center axis of the first portion 31 of the first electrode lead 3a and the center axis of the first portion 31 of the second electrode lead 3b and the center of the first housing wall 11 to the dimension of the first housing wall 11 is not greater than 47.5% in the first direction.

[0190] Exemplarily, the ratio of the distance L9 between the midpoint between the central axes of the first part 31 of the first electrode tab 3a and the central axes of the first part 31 of the second electrode tab 3b and the center of the first housing wall 11 to the size L2 of the first housing wall 11 along the first direction can be, but is not limited to, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, or 47.5%.

[0191] Thus, the ratio of the distance L9 between the midpoint between the central axes of the first part 31 of the first electrode tab 3a and the central axes of the first part 31 of the second electrode tab 3b and the center of the first housing wall 11 to the size L2 of the first housing wall 11 along the first direction is limited in the range of not more than 47.5%, so that the end of the first housing wall 11 close to the deviated direction is sufficient to mount the first electrode tab 3a and the second electrode tab 3b, and the continuous space of the first housing wall 11 on the side opposite to the deviated direction of the first electrode tab 3a and the second electrode tab 3b is larger, thereby facilitating the arrangement of other components and more facilitating the improvement of the volumetric energy density of the battery cell 20.

[0192] In some embodiments of the present disclosure, as shown in FIG. 9, the ratio of the distance L9 between the midpoint between the central axes of the first part 31 of the first electrode tab 3a and the central axes of the first part 31 of the second electrode tab 3b and the center of the first housing wall 11 to the size L2 of the first housing wall 11 along the first direction is in the range of 40% to 47.5%.

[0193] Exemplarily, the ratio of the distance L9 between the midpoint between the central axes of the first part 31 of the first electrode tab 3a and the central axes of the first part 31 of the second electrode tab 3b and the center of the first housing wall 11 to the size L2 of the first housing wall 11 along the first direction can be, but is not limited to, 40.2%, 40.5%, 40.7%, 41.3%, 41.5%, 41.8%, 42.1%, 42.5%, 42.6%, 43.4%, 43.5%, 43.9%, 44.4%, 44.5%, 44.8, 45.2, 45.5%, 46.3%, or 46.5%.

[0194] Therefore, the ratio of the distance L9 between the midpoint between the center axes of the first part 31 of the first electrode tab 3a and the first part 31 of the second electrode tab 3b along the first direction and the center of the first shell wall 11 to the size L2 of the first shell wall 11 is limited to the range of 40% to 47.5%, so that the end of the first shell wall 11 close to the deviated direction is sufficient to mount the first electrode tab 3a and the second electrode tab 3b, and the continuous space of the first shell wall 11 on the side opposite to the deviated direction of the first electrode tab 3a and the second electrode tab 3b is larger, thereby facilitating the arrangement of other components and further improving the volumetric energy density of the battery cell 20.

[0195] In some embodiments of the present disclosure, as shown in FIG. 6, the distance L7 between the center axis of the first part 31 and the end edge of the extension part 3312 away from the body part 3311 along the first direction in the same electrode tab is in the range of 30 mm to 80 mm.

[0196] It can be understood that the distance L7 between the center axis of the first part 31 of the first electrode tab 3a and the end edge of the extension part 3312 of the first electrode tab 3a away from the body part 3311 along the first direction is in the range of 30 mm to 80 mm. The distance L7 between the center axis of the first part 31 of the second electrode tab 3b and the end edge of the extension part 3312 of the second electrode tab 3b away from the body part 3311 along the first direction is in the range of 30 mm to 80 mm.

[0197] For example, the distance L7 between the center axis of the first part 31 and the end edge of the extension part 3312 away from the body part 3311 along the first direction in the same electrode tab can be, but is not limited to, in the range of 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, or 80 mm.

[0198] Therefore, by limiting the distance L7 between the center axis of the first part 31 and the end edge of the extension part 3312 away from the body part 3311 along the first direction in the same electrode tab to the range of 30 mm to 80 mm, it is beneficial to make the second part 33 of the electrode tab have a large enough welding area, thereby increasing the welding area of the second part 33 and the tab, improving the reliability of the electrical connection, and improving the performance of the battery cell 20.

[0199] In some embodiments of the present disclosure, the distance L7 between the center axis of the first part 31 and the end edge of the extension part 3312 away from the body part 3311 along the first direction in the same electrode tab is in the range of 40 mm to 60 mm.

[0200] It can be understood that along the first direction, the distance L7 between the center axis of the first part 31 of the first electrode tab 3a and the edge of the one end of the extension part 3312 of the first electrode tab 3a away from the body part 3311 along the first direction is in the range of 40mm-60mm. Along the first direction, the distance L7 between the center axis of the first part 31 of the second electrode tab 3b and the edge of the one end of the extension part 3312 of the second electrode tab 3b away from the body part 3311 is in the range of 40mm-60mm.

[0201] For example, in the same electrode tab, the distance between the center axis of the first part 31 and the edge of the one end of the extension part 3312 away from the body part 3311 along the first direction can be, but is not limited to, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm or 60mm.

[0202] In this way, by limiting the distance L7 between the center axis of the first part 31 and the edge of the one end of the extension part 3312 away from the body part 3311 along the first direction in the same electrode tab to the range of 40mm-60mm, it is beneficial to make the second part 33 of the electrode tab have a large enough welding area, thereby increasing the welding area of the second part 33 and the tab, thereby improving the reliability of the electrical connection, and also without occupying too much space in the first direction, which is also beneficial to improving the volumetric energy density.

[0203] In some embodiments of the present disclosure, as shown in FIG. 4, the size L2 of the first shell wall 11 along its length direction X is in the range of 170mm-1200mm.

[0204] For example, the size L2 of the first shell wall 11 along its length direction X can be, but is not limited to, 170mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm or 1200mm.

[0205] In order to verify that the size of the electrical connection area of the first shell wall 11 of the battery monomer 20 with the forwardly arranged adapter piece in the present disclosure in the first direction is reduced compared with the size of the electrical connection area of the battery monomer with the oppositely arranged adapter piece in the prior art in the first direction, the following takes the battery monomer as shown in FIG. 10 in the prior art and the battery monomer 20 as shown in FIG. 6 in the embodiment of the present disclosure as examples for reasoning verification.

[0206] Figure 6 is a battery cell 20 provided by some embodiments of the present disclosure, two adapter tabs 314 are arranged in the same direction in the battery cell 20. The size of the first end surface 3111 of the first electrode lead-out piece 3a and the second electrode lead-out piece 3b along the first direction is denoted as L6, the minimum distance between the first part 31 of the first electrode lead-out piece 3a and the first part 31 of the second electrode lead-out piece 3b along the first direction is denoted as L4, the size of the second end surface 3313 along the first direction is denoted as L5, the minimum distance between the second part 33 of the first electrode lead-out piece 3a and the second part 33 of the second electrode lead-out piece 3b along the first direction is denoted as L3, the distance between the center axis of the first part 31 and the edge of the extension part 3312 away from the body part 3311 along the first direction is denoted as L7, therefore, the total space occupied by the first electrode lead-out piece 3a and the second electrode lead-out piece 3b along the first direction is The distance between the center axis of the first part 31 of the first electrode lead-out piece 3a and the center axis of the first part 31 of the second electrode lead-out piece 3b along the first direction is

[0207] Figure 10 is a battery cell in the prior art, the electrode terminal of the battery cell is connected to the tab through an adapter tab, and two adapter tabs are arranged in opposite directions, L7' in Figure 10 denotes the distance between the center axis of the electrode terminal and the farthest end of the adapter tab along the first direction, L3' denotes the closest distance between the internal electrical connection structure, L6' denotes the size of the part of the electrode terminal outside the shell along the first direction, L8' denotes the size of the tab along the first direction, therefore, the size of the electrical connection area of the battery cell in Figure 10 along the first direction is The distance between the center axes of the two poles is 2xL7'+L3'.

[0208] Considering the process and the requirement of internal and external current overcurrent, L7>L6, L7>L5, L7'>L6', L7'>L8' are set; in order to make comparison more convenient, L7=L7', L6=L6', L3=L3' are set; it is known from the foregoing that L6>L5. The difference between the size of the electrical connection area in Figure 10 along the first direction and the size of the electrical connection area in Figure 6 along the first direction is The distance between the center axes of the two poles in Figure 10 and the distance between the center axes of the electrode terminals 30 in Figure 6 is

[0209] It can be seen that the spacing between the central axes of the electrode terminals in FIG. 10 is greater than the spacing between the central axes of the electrode terminals 30 in FIG. 6, thereby proving that the electrode terminals 30 in the embodiment of the present disclosure are more compact, which is conducive to improving the structural strength of the first shell wall 11. The difference between the size of the electrically connecting region in FIG. 10 along the first direction and the size of the electrically connecting region in FIG. 6 along the first direction is greater than 0, thereby proving that the space occupied by the first electrode lead-out 3a and the second electrode lead-out 3b in the embodiment of the present disclosure in the first direction is reduced, so that the continuous space on the inside and outside of the first shell wall 11 is relatively large, which is conducive to the arrangement of other components, thereby being conducive to improving the volumetric energy density of the battery monomer 20.

[0210] The second aspect of the present disclosure provides a battery 100 comprising at least one battery monomer 20 provided by the first aspect.

[0211] Since the battery 100 comprises the battery monomer 20, the battery 100 has all the beneficial effects possessed by the battery monomer 20, so that the structural strength of the battery 100 is high, and the volumetric energy density is high.

[0212] The third aspect of the present disclosure provides an energy storage device comprising at least one battery monomer 20 provided by the first aspect or a battery 100 provided by the second aspect.

[0213] Since the energy storage device comprises the battery monomer 20 or the battery 100, the energy storage device has all the beneficial effects possessed by the battery monomer 20 or the battery 100, so that the structural strength of the energy storage device is high, and it is conducive to reducing the accommodation space of the energy storage device for accommodating the battery monomer 20 or the battery 100, or the energy storage device can accommodate a larger capacity of the battery monomer 20 or the battery 100 in a limited accommodation space.

[0214] The fourth aspect of the present disclosure provides a power utilization device, which comprises a battery monomer 20 provided by the first aspect or a battery 100 provided by the second aspect for providing electric energy.

[0215] Since the power utilization device comprises the battery monomer 20 or the battery 100, the power utilization device has all the beneficial effects possessed by the battery monomer 20 or the battery 100, so that the structural strength of the power utilization device is high, and it is conducive to reducing the accommodation space of the power utilization device for accommodating the battery monomer 20 or the battery 100, or the power utilization device can accommodate a larger capacity of the battery monomer 20 or the battery 100 in a limited accommodation space.

[0216] In the following, specific examples of some embodiments of the present disclosure are described in conjunction with the accompanying drawings.

[0217] As a specific example, the battery cell 20 includes a housing (housing 1) having an end cover (first housing wall 11) and a receiving cavity containing an electrode assembly (electrode assembly 2), the end cover is provided with two polar posts (electrode terminals 30) distributed along the length direction (length direction X of the first housing wall 11) of the end cover, one end of each of the two polar posts in the receiving cavity is connected to two tabs (first tab 21 and second tab 22) of the electrode assembly through a jumper (jumper 314) respectively, the two jumpers extend from the end connected to the polar post to the same side, so that the jumpers are arranged in the same direction, and the ratio of the distance between the central axes of the two polar posts to the length of the end cover is not greater than 60%. Arranging the polar posts close to each other can improve the structural strength of the end cover, while leaving more space for arranging other structures on the end cover, and arranging without jumpers can further increase the space available for arranging structures on the end cover and reduce the height direction.

[0218] The various embodiments / implementation forms provided by the present disclosure can be combined with each other without producing contradictions.

[0219] The above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. Industrial applicability

[0220] The present disclosure provides a battery cell, a battery, an energy storage device and an electric device. In the battery cell, the extension part of the second part of the first electrode lead-out member and the extension part of the second part of the second electrode lead-out member extend from the body part connected thereto to the same side, i.e. the second part of the first electrode lead-out member and the second part of the second electrode lead-out member are arranged in the same direction, which is conducive to reducing the distance between the first part of the first electrode lead-out member and the first part of the second electrode lead-out member, and the present disclosure also limits the range of the ratio of the distance between the central axis of the first part of the first electrode lead-out member and the central axis of the first part of the second electrode lead-out member to the size of the first housing wall, so that the first electrode lead-out member and the second electrode lead-out member are arranged relatively concentratedly, which is conducive to improving the structural strength of the first housing wall, and the continuous space left on the inside and outside of the first housing wall is relatively large, which is conducive to the arrangement of other components, and further conducive to improving the volumetric energy density of the battery cell.

Claims

1. A single battery cell, comprising: The housing has a first housing wall and a receiving cavity; An electrode assembly is disposed within the receiving cavity, the electrode assembly having at least two tabs, the at least two tabs including a first tab and a second tab; At least two electrode leads, including a first electrode lead and a second electrode lead, both disposed on the first housing wall and arranged along a first direction. Each electrode lead includes a first part located on the outer side of the housing, a second part located on the inner side of the housing, and an intermediate part connecting the first part and the second part. The second part of the first electrode lead is connected to the first tab, and the second part of the second electrode lead is connected to the second tab. In the first direction, the ratio of the distance between the central axis of the first portion of the first electrode lead and the central axis of the first portion of the second electrode lead to the dimension of the first housing wall is not greater than 60%. The second portion of each of the electrode leads includes a body portion that coincides with the first portion in the wall thickness direction of the first housing wall and an extension portion that extends beyond the first portion in the first direction. The extension portion of the first electrode lead is located on the side of the body portion of the first electrode lead facing the second electrode lead, and the extension portion of the second electrode lead is located on the side of the body portion of the second electrode lead away from the first electrode lead.

2. The battery cell according to claim 1, wherein, Each of the electrode leads includes an electrode terminal passing through a terminal mounting hole in the first housing wall and an adapter piece connected to one end of the electrode terminal located within the receiving cavity. The portion of the electrode terminal located outside the housing is the first part, the portion located within the terminal mounting hole is the middle part, and the portion of the electrode terminal located inside the housing and the adapter piece form the second part.

3. The battery cell according to claim 1, wherein, The second part is a one-piece molded structure.

4. The battery cell according to any one of claims 1 to 3, wherein, Of the first electrode and the second electrode, one is a positive electrode and the other is a negative electrode.

5. The battery cell according to any one of claims 1 to 3, wherein, Both the first electrode and the second electrode are positive electrodes, or both the first electrode and the second electrode are negative electrodes.

6. The battery cell according to claim 5, wherein, The first electrode and the second electrode are formed as one unit.

7. The battery cell according to claim 4 or 5, wherein, The first electrode and the second electrode are spaced apart.

8. The battery cell according to claim 7, wherein, The minimum distance between the second part of the first electrode lead and the second part of the second electrode lead in the first direction is not less than 5 mm.

9. The battery cell according to any one of claims 1 to 8, wherein, Along the first direction, the distance between the central axis of the first part of the first electrode lead and the central axis of the first part of the second electrode lead is not greater than 100 mm.

10. The battery cell according to any one of claims 1 to 9, wherein, Along the first direction, the minimum distance between the first part of the first electrode lead and the first part of the second electrode lead is not less than 2 mm.

11. The battery cell according to claim 2, wherein, The end face of the electrode terminal of each electrode lead-out member that is away from the receiving cavity is the first end face, and the end face that is closer to the receiving cavity is the second end face. The area of ​​the second end face is smaller than the area of ​​the first end face.

12. The battery cell according to claim 11, wherein, Along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 20% to 150%.

13. The battery cell according to claim 11, wherein, Along the first direction, the ratio of the size of the second end face to the size of the first end face is in the range of 25% to 100%.

14. The battery cell according to any one of claims 11 to 13, wherein, Along the first direction, the size of the first end face is in the range of 20mm to 50mm, and / or the size of the second end face is in the range of 10mm to 30mm.

15. The battery cell according to any one of claims 11 to 13, wherein, Along the first direction, the size of the first end face is in the range of 25mm to 40mm, and / or the size of the second end face is in the range of 10mm to 25mm.

16. The battery cell according to claim 6, wherein, The dimension of the surface of the electrode facing the first housing wall along the first direction is in the range of 25mm to 65mm.

17. The battery cell according to claim 6, wherein, The dimension of the surface of the electrode facing the first housing wall along the first direction is in the range of 30mm to 50mm.

18. The battery cell according to any one of claims 1 to 17, wherein, Along the first direction, the midpoint between the central axis of the first portion of the first electrode lead and the central axis of the first portion of the second electrode lead is offset from the center of the first housing wall.

19. The battery cell according to claim 18, wherein, Along the first direction, the ratio of the distance between the midpoint of the central axis of the first part of the first electrode lead and the central axis of the first part of the second electrode lead and the center of the first housing wall to the size of the first housing wall is not greater than 47.5%.

20. The battery cell according to claim 18, wherein, Along the first direction, the ratio of the distance between the midpoint of the central axis of the first portion of the first electrode lead and the central axis of the first portion of the second electrode lead and the center of the first housing wall to the size of the first housing wall is in the range of 40% to 47.5%.

21. The battery cell according to any one of claims 1 to 20, wherein, In the same electrode lead-out member, the distance between the central axis of the first part and the edge of the extension part away from the body part along the first direction is in the range of 30mm to 80mm.

22. The battery cell according to any one of claims 1 to 20, wherein, In the same electrode lead-out member, the distance between the central axis of the first part and the edge of the extension part away from the body part along the first direction is in the range of 40mm to 60mm.

23. A battery, comprising: At least one battery cell according to any one of claims 1 to 22.

24. An energy storage device, comprising: At least one battery cell according to any one of claims 1 to 22 or the battery according to claim 23.

25. An electrical device comprising a battery cell of any one of claims 1 to 22 or a battery of claim 23 for providing electrical energy.

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