Battery cell, battery pack, electrical device, and energy storage device

Abstract

A battery cell (100), a battery pack, an electrical device, and an energy storage device, relating to the technical field of batteries. The battery cell (100) comprises a case (1), bare cells (2), poles (3), and adapter pieces (4). The case (1) is provided with an accommodating cavity (1a), and the bare cells (2) are arranged in the accommodating cavity (1a); the arrangement direction of a plurality of tabs (21) of the same bare cell (2) is a first direction; the poles (3) are mounted on the case (1); the adapter pieces (4) are respectively connected to the tabs (21) and the poles (3); positions where the tabs (21) are connected to the adapter pieces (4) are first positions (4a), and positions where the poles (3) are connected to the adapter pieces (4) are second positions (4b); the arrangement direction of the bare cells (2) and the adapter pieces (4) is a second direction; and in the second direction, the second positions (4b) are located on the side of the first positions (4a) close to cell bodies of the bare cells (2). According to the battery cell (100), the second positions (4b) are provided on the side of the first positions (4a) close to the cell bodies, such that the space occupied by the poles (3) overlaps the space of the tabs (21) protruding from the cell bodies (22), thereby facilitating shortening of the length of the battery cell (100) in the second direction, and thus facilitating improvement of the energy density of the battery cell (100).

Description

Battery monomer, battery pack, electric device and energy storage device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202420696468.8, filed on April 7, 2024, entitled "Battery monomer, battery pack, electric device and energy storage device", the contents of which are hereby incorporated by reference in its entirety into the present disclosure. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery monomer, a battery pack, an electric device and an energy storage device. BACKGROUND

[0004] With the development of the new energy industry, the requirement for the energy density of batteries is getting higher and higher. In the related art, the energy density of the battery monomer needs to be improved.

[0005] SUMMARY

[0006] To solve the above technical problems, the present disclosure provides a battery monomer, a battery pack, an electric device and an energy storage device to improve the energy density of the battery monomer.

[0007] The present disclosure is implemented by the following technical solutions.

[0008] A first aspect of the embodiments of the present disclosure provides a battery monomer, comprising:

[0009] a housing having a receiving cavity;

[0010] a bare cell disposed in the receiving cavity, and the arrangement direction of a plurality of tabs of the same bare cell is a first direction;

[0011] a pole installed on the housing;

[0012] a jumper, the jumper is connected with the tab and the pole respectively, the position where the tab is connected with the jumper is a first position, the position where the pole is connected with the jumper is a second position, the arrangement direction of the bare cell and the jumper is a second direction, and the second position is located on the side of the first position close to the cell body of the bare cell along the second direction.

[0013] In the embodiment of the present disclosure, the second position is arranged on the side close to the main body of the battery cell of the first position along the second direction, so that the space occupied by the pole post overlaps with the space in which the tab protrudes from the main body of the battery cell along the second direction. In the process of installing the pole post, the pole post can be installed by using the space in which the tab protrudes from the main body of the battery cell along the second direction, which is beneficial to reduce the length of the battery cell along the second direction. On the one hand, under the condition that the length of the main body of the battery cell along the second direction is unchanged, the length of the battery cell along the second direction in the embodiment of the present disclosure is smaller, which is beneficial to improve the energy density of the battery cell. On the other hand, under the condition that the length of the battery cell along the second direction is unchanged, the length of the main body of the battery cell along the second direction in the embodiment of the present disclosure is larger, which is also beneficial to improve the energy density of the battery cell.

[0014] In an embodiment, along the first direction, the tab is arranged on the side away from the other pole post of the corresponding pole post.

[0015] In the embodiment of the present disclosure, the tab is arranged on the side away from the other pole post of the corresponding pole post, so that the pole post is located between the positive tab and the negative tab along the first direction, which is beneficial to increase the distance between the positive tab and the negative tab, and then beneficial to reduce the risk of short circuit caused by the overlap of the positive tab and the negative tab, and beneficial to improve the safety performance of the battery cell.

[0016] In an embodiment, the shell comprises:

[0017] a housing;

[0018] an end cover mounted on the shell, the end cover and the shell surrounding a receiving cavity, the end cover comprising a first cover body and a second cover body connected to each other, the first cover body and the second cover body being arranged alternately along the first direction, the pole post being mounted on the first cover body, the tab being located in the space surrounded by the second cover body and the housing, and along the second direction, the first cover body being located on the side close to the receiving cavity of the second cover body.

[0019] In the embodiment of the present disclosure, the first cover body is located on the side close to the receiving cavity of the second cover body along the second direction, and the first cover body is closer to the main body of the battery cell than the second cover body. On the one hand, the first cover body closer to the main body of the battery cell is beneficial to the protrusion of the pole post from the first cover body, which is convenient for the current in the battery cell to be led out from the pole post. On the other hand, the first cover body closer to the main body of the battery cell can use the space in which the tab protrudes from the main body of the battery cell along the second direction, so that the space occupied by the pole post overlaps with the space in which the tab protrudes from the main body of the battery cell along the second direction. In the process of installing the pole post, the pole post can be installed by using the space in which the tab protrudes from the main body of the battery cell along the second direction, which is beneficial to reduce the length of the battery cell along the second direction, and under the condition that the length of the battery cell along the second direction is unchanged, it is beneficial to improve the energy density of the battery cell. Under the condition that the length of the battery cell along the second direction is unchanged, the length of the main body of the battery cell along the second direction can be increased, which is also beneficial to improve the energy density of the battery cell.

[0020] In an embodiment, a distance from a surface of the first cover body on a side away from the accommodation cavity to the cell body is a first distance, and a distance from a surface of the second cover body on a side away from the accommodation cavity to the cell body is a second distance, and the first distance is less than or equal to the second distance.

[0021] In an embodiment of the present disclosure, the first distance is less than or equal to the second distance, so that the surface of the pole post on the side away from the accommodation cavity does not protrude from the surface of the second cover body on the side away from the accommodation cavity in the second direction, which is conducive to making full use of the space in which the tab protrudes from the cell body to install the pole post, thereby further reducing the length of the battery monomer in the second direction. Under the condition that the length of the battery monomer in the second direction is unchanged, the length of the cell body in the second direction can be further increased, which is conducive to improving the energy density of the battery monomer.

[0022] In an embodiment, a distance from a surface of the first cover body on a side away from the accommodation cavity to the cell body is a third distance, and the third distance is less than the first distance.

[0023] In an embodiment of the present disclosure, the third distance is less than the first distance, so that the pole post protrudes from the first cover body, which is convenient for the current in the battery monomer to be led out from the pole post, and is conducive to improving the practicability of the battery monomer.

[0024] In an embodiment, the shell includes a first side plate and a second side plate arranged in a cross manner, the first side plate, the second side plate, and the end cover enclose the accommodation cavity, the first side plate is arranged to extend in the first direction, and the first side plate has a groove in a coverage range of the first cover body, so that the first cover body is located in the groove.

[0025] In an embodiment of the present disclosure, the groove of the first side plate is used to accommodate the first cover body closer to the cell body. On the one hand, the groove of the first side plate is conducive to reducing the amount of material of the first side plate, thereby being conducive to reducing the production cost of the battery monomer. On the other hand, the first cover body is located in the groove, so that the shape of the end cover is adapted to the shape of the shell, which is conducive to improving the sealing performance of the shell, thereby being conducive to improving the service life of the battery monomer.

[0026] In an embodiment, the number of bare cells is at least two, the arrangement direction of the at least two bare cells is a third direction, the third direction intersects the first direction, the adapter piece includes a first connecting piece and a plurality of second connecting pieces arranged in the third direction, the plurality of second connecting pieces are connected to the first connecting piece in the first direction, the first position is located at the second connecting piece, and the second position is located at the first connecting piece.

[0027] In an embodiment of the present disclosure, the plurality of second connecting pieces are arranged at intervals, and no corresponding material needs to be filled between the plurality of second connecting pieces, which is conducive to reducing the amount of material of the adapter piece, thereby being conducive to reducing the production cost of the adapter piece.

[0028] In an embodiment, the first connecting piece has an adapter slot, and the adapter slot is recessed towards the accommodating cavity. An end of the pole post close to the accommodating cavity is embedded in the adapter slot.

[0029] In the embodiments of the present disclosure, the end of the pole post close to the accommodating cavity is embedded in the adapter slot and mutually embedded with the adapter slot, which is conducive to improving the connection strength and stability of the pole post and the first connecting piece, and in turn is conducive to improving the quality of the battery monomer.

[0030] The second aspect of the embodiments of the present disclosure provides a battery pack, comprising:

[0031] The battery monomer of any one of the preceding embodiments;

[0032] A box body, and the battery monomer is arranged in the box body.

[0033] The third aspect of the embodiments of the present disclosure provides a battery pack, comprising:

[0034] The battery pack of any one of the preceding embodiments;

[0035] A power consumption main body, and the battery pack is arranged in the power consumption main body, and the battery pack provides power for the power consumption main body.

[0036] The fourth aspect of the embodiments of the present disclosure provides a battery pack, comprising:

[0037] The battery pack of any one of the preceding embodiments;

[0038] An energy storage main body, and the battery pack is arranged in the energy storage main body, and the battery pack can store power generated by the energy storage main body.

[0039] Inventive effects:

[0040] In the embodiments of the present disclosure, the second position is arranged on the side close to the battery monomer main body of the first position along the second direction, so that the space occupied by the pole post overlaps with the space of the tab protruding from the battery monomer main body along the second direction. In the process of installing the pole post, the pole post can be installed by using the space of the tab protruding from the battery monomer main body along the second direction, which is conducive to reducing the length of the battery monomer along the second direction. On the one hand, under the condition that the length of the battery monomer main body along the second direction is unchanged, the length of the battery monomer along the second direction in the embodiments of the present disclosure is smaller, which is conducive to improving the energy density of the battery monomer. On the other hand, under the condition that the length of the battery monomer along the second direction is unchanged, the length of the battery monomer main body along the second direction in the embodiments of the present disclosure is larger, which is also conducive to improving the energy density of the battery monomer. BRIEF DESCRIPTION OF DRAWINGS

[0041] Various other advantages and benefits will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not intended to limit the present disclosure. Furthermore, the same reference numbers in different drawings identify the same components. In the drawings:

[0042] Fig. 1 is a structural schematic diagram of a battery cell in an embodiment of the present disclosure;

[0043] Fig. 2 is an exploded schematic diagram of Fig. 1;

[0044] Fig. 3 is a structural schematic diagram of the battery cell from another perspective in an embodiment of the present disclosure;

[0045] Fig. 4 is a structural schematic diagram of a section at A-A in Fig. 3;

[0046] Fig. 5 is an enlarged structural schematic diagram of B in Fig. 4.

[0047] Fig. 6 is a structural schematic diagram of a jumper in an embodiment of the present disclosure.

[0048] Explanation of Reference Signs

[0049] 100, battery cell; 1, shell; 1a, accommodating cavity; 11, end cover; 111, first cover body; 112, second cover body; 12, shell body; 121, first side plate; 121a, groove; 122, second side plate; 2, bare cell; 21, tab; 22, cell body; 3, pole; 4, jumper; 4a, first position; 4b, second position; 41, first connecting piece; 41a, jumper groove; 42, second connecting piece. DETAILED DESCRIPTION

[0050] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.

[0051] 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 present disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure; the terms "comprising" and "having," and any variations thereof, are intended to cover not exclusively including.

[0052] In the description of the embodiments of the disclosure, the technical terms "first", "second", "third" 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 embodiments of the disclosure, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0053] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of the disclosure, the term "and / or" is only a description of 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 alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are "or" relationship.

[0055] In the description of the embodiments 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 mechanical connection, or it can be electrical connection; 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 embodiments of the disclosure can be understood according to the specific circumstances.

[0056] In the description of the embodiments 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.

[0057] As part of the inventive concept of the disclosure, before describing the embodiments of the disclosure, the reason why the energy density of the battery cell needs to be improved in the related art is analyzed, and the technical solution of the embodiments of the disclosure is obtained through reasonable analysis.

[0058] In the related art, the pole posts and the tabs of the battery monomer are arranged along the second direction, and the pole posts and the tabs are staggered along the second direction, which results in less space shared by the pole posts and the tabs along the second direction, and then the pole posts and the tabs occupy a larger space of the battery monomer in the second direction, so that the length of the battery main body along the second direction is shorter, which is not conducive to improving the energy density of the battery monomer.

[0059] In the embodiment of the present disclosure, the second position is arranged on the side close to the battery main body of the first position along the second direction, so that the space of the tab protruding from the battery main body can be used in the process of installing the pole post, and then the length of the battery main body along the second direction can be correspondingly lengthened, which is conducive to improving the energy density of the battery monomer.

[0060] The scheme of the embodiment of the present disclosure can be applied to, but is not limited to, a battery monomer, a battery pack, a power consumption device, and an energy storage device.

[0061] The embodiment of the present disclosure provides an energy storage device, which comprises a battery pack and an energy storage main body. The battery pack is arranged on the energy storage main body, and the battery pack can store the power generated by the energy storage main body.

[0062] The battery pack of the energy storage device can be, but is not limited to, an energy storage container, an energy storage cabinet, etc.

[0063] The embodiment of the present disclosure provides a power consumption device, which comprises a battery pack and a power consumption main body. The battery pack is arranged on the power consumption main body, and the battery pack provides power for the power consumption main body.

[0064] The power consumption device 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 car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0065] In the following embodiments, for the convenience of description, the power consumption device of an embodiment of the present disclosure is taken as a vehicle for example. The vehicle 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 electric automobile, or a range extended automobile, etc. The vehicle is internally provided with a battery pack, which can be arranged at the bottom, the head, or the tail of the vehicle. The battery pack can be used for power supply of the vehicle, for example, the battery pack can be used as an operating power source of the vehicle. The vehicle can include a power consumption main body, which includes a controller and a motor. The controller is used to control the battery pack to supply power to the motor, for example, to meet the working power demand of the vehicle during starting, navigation, and driving.

[0066] In an embodiment of the present disclosure, the battery pack can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0067] The battery pack provided by the embodiments of the present disclosure comprises a battery cell 100 and a box. The battery cell 100 is arranged in the box.

[0068] The box refers to a structure having a containing space, and the battery cell 100 is arranged in the box to contain the battery cell 100 of the battery pack.

[0069] The battery cell 100 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 battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the present disclosure is not particularly limited.

[0070] The number of the battery cell 100 can be multiple, and the multiple battery cells 100 can be connected in series, in parallel or in a mixed manner. The mixed manner refers to that the multiple battery cells 100 are connected in series and in parallel. The multiple battery cells 100 can be directly connected in series, in parallel or in a mixed manner to form a battery pack. Of course, the multiple battery cells 100 can be connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel or in a mixed manner to form a battery pack. The battery pack can further comprise other structures, for example, the battery pack can further comprise a busbar component for realizing the electrical connection between the multiple battery cells 100.

[0071] The battery cell 100 refers to a unit capable of realizing the mutual conversion between chemical energy and electrical energy.

[0072] In the embodiments of the present disclosure, the battery cell 100 can be a secondary battery, which refers to a battery cell 100 that can be activated by charging after discharging to continue to be used.

[0073] In the embodiments of the present disclosure, the battery cell 100 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.

[0074] The battery cell 100 of the embodiments of the present disclosure, please refer to FIG. 1-5, comprising a shell 1, a bare cell 2, a pole 3 and a adapter sheet 4. The shell 1 has a containing cavity 1a, the bare cell 2 is arranged in the containing cavity 1a, the arrangement direction of the multiple tabs 21 of the same bare cell 2 is the first direction, the pole 3 is installed on the shell 1, the adapter sheet 4 is connected with the tab 21 and the pole 3 respectively, the position where the tab 21 is connected with the adapter sheet 4 is the first position 4a, the position where the pole 3 is connected with the adapter sheet 4 is the second position 4b, the arrangement direction of the bare cell 2 and the adapter sheet 4 is the second direction, the second position 4b is located on the side of the cell main body 22 of the bare cell 2 close to the first position 4a along the second direction.

[0075] Exemplarily, the material of the shell 1 is not limited, and can be steel or aluminum, for example.

[0076] Exemplarily, the material of the pole 3 is not limited, and can be copper or aluminum, for example.

[0077] Exemplarily, the material of the tab 21 is not limited, and can be copper or aluminum, for example.

[0078] Exemplarily, the material of the adapter plate 4 is not limited, and can be copper or aluminum, for example.

[0079] Exemplarily, the structure of the battery cell 100 is not limited, and can be a square shell battery cell or a blade-shaped battery cell, for example.

[0080] It should be noted that the first direction is the direction indicated by R1 in FIG. 2, and the second direction is the direction indicated by R2 in FIG. 2.

[0081] It should be noted that the tab 21 includes a positive tab and a negative tab, and the pole 3 includes a positive pole and a negative pole.

[0082] In the embodiment of the present disclosure, by setting the second position 4b to the side of the first position 4a close to the cell body 22 along the second direction, the space occupied by the pole 3 overlaps with the space of the tab 21 protruding from the cell body 22 along the second direction. In the process of installing the pole 3, the tab 21 can be used to install the pole 3, which is protruding from the cell body 22 along the second direction, and is conducive to reducing the length of the battery cell 100 along the second direction. On the one hand, under the condition that the length of the cell body 22 along the second direction is unchanged, the length of the battery cell 100 along the second direction is smaller, which is conducive to improving the energy density of the battery cell 100; on the other hand, under the condition that the length of the battery cell 100 along the second direction is unchanged, the length of the cell body 22 along the second direction is larger, which is also conducive to improving the energy density of the battery cell 100.

[0083] It can be understood that, for two battery cells 100 with the same length, the bare cell 2 of the battery cell 100 according to the embodiment of the present disclosure is longer along the second direction, which is conducive to improving the energy density of the battery cell 100. For two bare cells 2 with the same length, the length of the battery cell 100 according to the embodiment of the present disclosure is shorter along the second direction, and under the condition that the internal space of the battery pack box is unchanged, the box can accommodate more battery cells 100, which is conducive to improving the energy density of the battery pack.

[0084] In an embodiment, referring to FIGS. 2, 4 and 5, along the first direction, the tab 21 is arranged on the side of the corresponding pole 3 away from the other pole 3.

[0085] In the embodiments of the present disclosure, the tab 21 is arranged on the side of the corresponding pole 3 away from the other pole 3, so that the pole 3 is located between the positive tab 21 and the negative tab 21 along the first direction, which is beneficial to increase the distance between the positive tab 21 and the negative tab 21, thereby reducing the risk of short circuit caused by the overlap of the positive tab 21 and the negative tab 21, and improving the safety performance of the battery monomer 100.

[0086] It can be understood that the positional relationship between the tab 21 and the pole 3 along the first direction is not limited.

[0087] Exemplarily, the pole 3 can be arranged on the side of the corresponding tab 21 away from the other tab 21, and the tab 21 is located between the positive pole 3 and the negative pole 3 along the first direction.

[0088] Exemplarily, the pole 3 and the tab 21 are arranged alternately along the first direction.

[0089] In an embodiment, referring to FIGS. 1-5, the shell 1 includes a housing 12 and an end cover 11. The end cover 11 is mounted on the shell 1, and the end cover 11 and the shell 1 enclose a receiving cavity 1a. The end cover 11 includes a first cover body 111 and a second cover body 112 connected to each other, and the first cover body 111 and the second cover body 112 are arranged alternately along a first direction. The pole 3 is mounted on the first cover body 111, and the tab 21 is located in the space enclosed by the second cover body 112 and the housing 12. Along a second direction, the first cover body 111 is located on the side of the second cover body 112 close to the receiving cavity 1a.

[0090] In the embodiments of the present disclosure, the first cover body 111 is located on the side of the second cover body 112 close to the receiving cavity 1a along the second direction, and the first cover body 111 is closer to the core body 22 than the second cover body 112. On the one hand, the first cover body 111 closer to the core body 22 is beneficial to the pole 3 protruding from the first cover body 111, which facilitates the current in the battery monomer 100 to be conducted from the pole 3. On the other hand, the first cover body 111 closer to the core body 22 can utilize the space in which the tab 21 protrudes from the core body 22 along the second direction, so that the space occupied by the pole 3 overlaps with the space in which the tab 21 protrudes from the core body 22 along the second direction. In the process of mounting the pole 3, the pole 3 can be mounted by utilizing the space in which the tab 21 protrudes from the core body 22, which is beneficial to reducing the length of the battery monomer 100 along the second direction. Under the condition that the length of the battery monomer 100 along the second direction is unchanged, increasing the length of the core body 22 along the second direction is also beneficial to improving the energy density of the battery monomer 100.

[0091] It can be understood that the arrangement relationship of the first cover body 111 and the second cover body 112 along the second direction is not limited. Exemplarily, along the second direction, the first cover body 111 is located in the same plane as the second cover body 112.

[0092] It can be understood that the arrangement relationship of the first cover body 111 and the second cover body 112 along the second direction is not limited. Exemplarily, along the second direction, the first cover body 111 is located in the same plane as the second cover body 112.

[0093] Exemplarily, referring to FIG. 1 and FIG. 2, the end cover 11 includes one first cover body 111 and two second cover bodies 112. Along the first direction, the two ends of the first cover body 111 are connected with the second cover bodies 112 respectively. Along the second direction, the first cover body 111 is located at the side of the second cover body 112 close to the accommodation cavity 1a, so that the two ends of the end cover 11 are convex outward along the first direction, and the middle part is concave inward.

[0094] Exemplarily, the end cover 11 includes two first cover bodies 111 and one second cover body 112. Along the first direction, the two ends of the second cover body 112 are connected with the first cover bodies 111 respectively. Along the second direction, the first cover bodies 111 are located at the side of the second cover body 112 close to the accommodation cavity 1a, so that the two ends of the end cover 11 are concave inward along the first direction, and the middle part is convex outward.

[0095] Exemplarily, the end cover 11 includes two first cover bodies 111 and one second cover body 112. Along the first direction, the two ends of the second cover body 112 are connected with the first cover bodies 111 respectively. Along the second direction, the first cover bodies 111 are located at the side of the second cover body 112 close to the accommodation cavity 1a, so that the two ends of the end cover 11 are concave inward along the first direction, and the middle part is convex outward.

[0096] Exemplarily, the end cover 11 includes two first cover bodies 111 and one second cover body 112. Along the first direction, the two ends of the second cover body 112 are connected with the first cover bodies 111 respectively. Along the second direction, the first cover bodies 111 are located at the side of the second cover body 112 close to the accommodation cavity 1a, so that the two ends of the end cover 11 are concave inward along the first direction, and the middle part is convex outward.

[0097] In an embodiment, referring to FIG. 4 and FIG. 5, the distance from the surface of the pole 3 away from the accommodation cavity 1a to the cell body 22 is a first distance, and the distance from the surface of the second cover body 112 away from the accommodation cavity 1a to the cell body 22 is a second distance. The first distance is less than or equal to the second distance.

[0098] In the embodiment of the present disclosure, the first distance is less than or equal to the second distance, so that the surface of the pole 3 away from the accommodation cavity 1a does not protrude from the surface of the second cover 112 away from the accommodation cavity 1a in the second direction, which is beneficial to fully utilize the space of the tab 21 protruding from the battery body 22 to install the pole 3, thereby further reducing the length of the battery monomer 100 in the second direction. Under the condition that the length of the battery monomer 100 in the second direction is unchanged, the length of the battery body 22 in the second direction can be further increased, which is beneficial to improve the energy density of the battery monomer 100.

[0099] It can be understood that the size relationship between the first distance and the second distance is not limited, and the first distance can also be greater than the second distance. The surface of the pole 3 away from the accommodation cavity 1a can protrude from the surface of the second cover 112 away from the accommodation cavity 1a in the second direction.

[0100] In an embodiment, referring to FIGS. 4 and 5, the distance from the surface of the first cover 111 away from the accommodation cavity 1a to the battery body 22 is a third distance, and the third distance is less than the first distance.

[0101] In the embodiment of the present disclosure, the third distance is less than the first distance, so that the pole 3 protrudes from the first cover 111, which is convenient for the current in the battery monomer 100 to be led out from the pole 3, and is beneficial to improve the practicability of the battery monomer 100.

[0102] It can be understood that the size relationship between the third distance and the first distance is not limited, and the third distance can also be greater than or equal to the first distance.

[0103] In an embodiment, referring to FIGS. 1 and 2, the shell 12 includes a first side plate 121 and a second side plate 122 arranged in a cross manner, and the first side plate 121, the second side plate 122 and the end cover 11 surround to form the accommodation cavity 1a. The first side plate 121 is arranged to extend in the first direction, and the first side plate 121 has a groove 121a in the coverage range of the first cover 111, so that the first cover 111 is located in the groove 121a.

[0104] In the embodiment of the present disclosure, the groove 121a of the first side plate 121 is used to accommodate the first cover 111 closer to the battery body 22. On the one hand, the groove 121a of the first side plate 121 is beneficial to reduce the amount of material of the first side plate 121, thereby being beneficial to reduce the production cost of the battery monomer 100; on the other hand, the first cover 111 is located in the groove 121a, so that the shape of the end cover 11 is adapted to the shape of the shell 12, which is beneficial to improve the sealing performance of the shell 1, thereby being beneficial to improve the service life of the battery monomer 100.

[0105] It can be understood that the first side plate 121 can also not be provided with the groove 121a within the coverage range of the first cover body 111. Exemplarily, the first side plate 121 protrudes from the first cover body 111 in the second direction within the coverage range of the first cover body 111.

[0106] In an embodiment, referring to FIGS. 2 and 6, the number of bare cells 2 is at least two, the arrangement direction of the at least two bare cells 2 is a third direction, the third direction intersects the first direction, the adapter piece 4 includes a first connecting piece 41 and a plurality of second connecting pieces 42 arranged at intervals in the third direction, the plurality of second connecting pieces 42 are connected to the first connecting piece 41 in the first direction, the first position 4a is located at the second connecting piece 42, and the second position 4b is located at the first connecting piece 41.

[0107] It should be noted that the direction represented by R3 in FIG. 2 is the third direction.

[0108] Exemplarily, as shown in FIGS. 2 and 6, the number of bare cells 2 is two, the adapter piece 4 includes one first connecting piece 41 and two second connecting pieces 42 arranged at intervals in the third direction, and the two second connecting pieces 42 are connected to the first connecting piece 41 in the first direction.

[0109] In the embodiment of the present disclosure, the plurality of second connecting pieces 42 are arranged at intervals, and it is not necessary to fill corresponding materials between the plurality of second connecting pieces 42, which is beneficial to reduce the amount of material of the adapter piece 4, and in turn beneficial to reduce the production cost of the adapter piece 4.

[0110] It can be understood that the number of second adapter pieces 4 is not limited. Exemplarily, the adapter piece 4 includes one first connecting piece 41 and one second connecting piece 42, the one second connecting piece 42 is arranged in extension in the third direction, and the one second connecting piece 42 is connected to the one first connecting piece 41 in the first direction.

[0111] In an embodiment, referring to FIG. 6, the first connecting piece 41 has an adapter groove 41a, the recess direction of the adapter groove 41a is toward the accommodation cavity 1a, and one end of the pole 3 close to the accommodation cavity 1a is embedded with the adapter groove 41a.

[0112] In the embodiment of the present disclosure, one end of the pole 3 close to the accommodation cavity 1a is located in the adapter groove 41a and embedded with the adapter groove 41a, which is beneficial to improve the connection strength and stability of the pole 3 and the first connecting piece 41, and in turn beneficial to improve the quality of the battery monomer 100.

[0113] It can be understood that the first connecting piece 41 can also not be provided with the adapter groove 41a. Exemplarily, the surface of the first connecting piece 41 away from the accommodation cavity 1a in the second direction is a plane, and the second position 4b is formed on the plane.

[0114] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the present disclosure. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, comprising: a housing having a receiving cavity; A bare battery cell is disposed in the accommodating cavity, wherein the arrangement direction of the multiple tabs of the same bare battery cell is a first direction; a pole, mounted on the housing; The adapter plate is respectively connected to the pole ear and the pole, the position where the pole ear is connected to the adapter plate is the first position, the position where the pole is connected to the adapter plate is the second position, the arrangement direction of the bare battery cell and the adapter plate is the second direction, and the second position is located along the second direction on the side of the battery body of the bare battery cell close to the first position.

2. The battery cell according to claim 1, wherein: Along the first direction, the electrode tab is arranged on a side of the corresponding electrode facing away from the other electrode.

3. The battery cell according to claim 1 or 2, wherein: The housing comprises: case; An end cover is installed on the outer shell, and the end cover and the outer shell enclose the accommodating cavity. The end cover includes a first cover body and a second cover body connected to each other, and the first cover body and the second cover body are alternately arranged along the first direction. The pole is installed on the first cover body, and the pole ear is located in the space enclosed by the second cover body and the shell. Along the second direction, the first cover body is located on the side of the second cover body close to the accommodating cavity.

4. The battery cell according to claim 3, wherein: The distance from the surface of the pole facing away from the accommodating cavity to the battery cell body is a first distance, and the distance from the surface of the second cover facing away from the accommodating cavity to the battery cell body is a second distance, and the first distance is less than or equal to the second distance.

5. The battery cell according to claim 4, wherein: A distance between a surface of the first cover body facing away from the accommodating cavity and the battery cell body is a third distance, and the third distance is smaller than the first distance.

6. The battery cell according to any one of claims 3 to 5, wherein: The shell includes a first side plate and a second side plate arranged crosswise, the first side plate, the second side plate and the end cover enclose the accommodating cavity, the first side plate extends along the first direction, and the first side plate has a groove within the coverage range of the first cover body so that the first cover body is located in the groove.

7. The battery cell according to any one of claims 1 to 6, wherein: The number of the bare cells is at least two, and the arrangement direction of the at least two bare cells is a third direction, which intersects with the first direction. The adapter plate includes a first connecting plate and a plurality of second connecting plates arranged at intervals along the third direction, and the plurality of second connecting plates are connected to the first connecting plate along the first direction. The first position is located on the second connecting plate, and the second position is located on the first connecting plate.

8. The battery cell according to claim 7, wherein: The first connecting piece has a transfer groove, the recessed direction of the transfer groove faces the accommodating cavity, and one end of the pole close to the accommodating cavity is engaged with the transfer groove.

9. A battery pack comprising: The battery cell according to any one of claims 1 to 8; A box body, wherein the battery cell is arranged in the box body.

10. An electrical device comprising: The battery pack according to claim 9; The battery pack is provided on the power-consuming main body, and provides power to the power-consuming main body.

11. An energy storage device comprising: The battery pack according to claim 9; The energy storage body, the battery pack is arranged in the energy storage body, and the battery pack can store the electricity generated by the energy storage body.

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