Battery, electrical device and energy storage device

Abstract

A battery, an electrical device and an energy storage device. The battery comprises a case body (1), at least one battery cell module (2) and at least one connecting member (3); an accommodating space (11) is formed in the case body (1); the accommodating space (11) is used for accommodating battery cells (21); each battery cell module (2) comprises at least two battery cells (21); each battery cell (21) comprises a casing (211) and an electrode assembly (212) accommodated in the casing (211); each electrode assembly (212) comprises a positive electrode sheet (2121), a negative electrode sheet (2122) and a separator (2123) which are stacked in a first direction; the at least two battery cells (21) of each battery cell module (2) are arranged in the first direction; the connecting member (3) is connected to the battery cells (21) adjacent in the first direction and, when the battery cells (21) swell, is used for applying to the battery cells (21) adjacent in the first direction pulling forces towards each other in the first direction.

Description

Battery, power utilization 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. 202421276119.7, filed on June 5, 2024, entitled “Battery, power utilization device and energy storage device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

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

[0004] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used, and batteries are also increasingly used in the field of energy storage and the like.

[0005] In a battery, there is a case where a battery monomer expands in volume during a charge and discharge cycle, which may have an impact on the performance and cycle life of the battery. Therefore, how to reduce the expansion of the battery monomer is one of the research topics in the industry.

[0006] SUMMARY

[0007] To solve the above technical problems, the present disclosure provides a battery, a power utilization device and an energy storage device capable of reducing the expansion and deformation of a battery monomer.

[0008] The present disclosure is implemented by the following technical solutions.

[0009] A first aspect of the present disclosure provides a battery, comprising: a box body, wherein an accommodation space is formed in the box body, and the accommodation space is used to accommodate a battery monomer; at least one battery monomer module, wherein each battery monomer module comprises at least two battery monomers, each battery monomer comprises a shell and an electrode assembly accommodated in an accommodation cavity of the shell, the electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a separator arranged in a first direction in a stacked manner, and at least two battery monomers of each battery monomer module are arranged in the first direction; and at least one connecting piece, wherein the connecting piece connects the battery monomers adjacent in the first direction, and is used to apply a pulling force along the first direction towards each other to the battery monomers adjacent in the first direction in the case of expansion of the battery monomers.

[0010] Since the battery includes the connecting pieces connecting the adjacent battery monomers, when the battery monomers expand, the connecting pieces can exert pulling force on the adjacent battery monomers towards each other, thereby limiting the expansion of the battery monomers to a certain extent, reducing the possibility of structural deformation of the box caused by the expansion of the battery monomers, improving the reliability and stability of the battery, and being conducive to improving the performance and service life of the battery.

[0011] In addition, since the battery monomers adjacent in the first direction are connected to each other by the connecting pieces, no additional fixing beams, pressing plates or other structures need to be arranged in the box, the overall weight of the battery can be effectively reduced, the space utilization in the box is improved, and the energy density of the battery is improved.

[0012] In some embodiments, the shell includes a plurality of shell walls, the shell walls include a first shell wall, the first shell wall is the shell wall with the largest area among the plurality of shell walls; the battery monomers are arranged in the containing space in a manner that the first shell wall is parallel to the bottom plate of the box.

[0013] Therefore, the battery monomers are arranged in a large-face-down flat-lying manner in the box, which is suitable for a narrow thickness direction (first direction) and a relatively spacious horizontal direction (third direction) installation space. In addition, the flat-lying arranged battery monomers are less likely to spread the thermal runaway when thermal runaway occurs, and have higher reliability and better stability.

[0014] In some embodiments, the shell wall further includes a second shell wall; the connecting piece connects the adjacent second shell walls of the battery monomers adjacent in the first direction.

[0015] Therefore, when the battery monomers expand, the connecting piece can exert pulling force on the adjacent second shell walls towards each other, so that the first shell wall with the largest area in the shell wall can be close to each other, thereby effectively reducing the expansion degree of the battery monomers in the first direction and improving the reliability of the battery.

[0016] In some embodiments, the connecting piece includes a first connecting piece and a second connecting piece, at least the first connecting piece is arranged on the battery monomer; the battery monomers adjacent in the first direction are connected by cooperation of the first connecting piece and the second connecting piece.

[0017] Therefore, the adjacent battery monomers in each battery monomer module can be connected to each other by cooperation of the first connecting piece and the second connecting piece in a simple structure and an easy way, the connection strength between the battery monomers adjacent in the first direction is improved, and the deformation degree of the battery monomers is reduced.

[0018] In some embodiments, the first connecting member comprises a protruding structure arranged on the battery cell; and the second connecting member comprises a winding member wound around the protruding structure arranged on the battery cell adjacent to the battery cell in the first direction.

[0019] Thus, the battery cells adjacent to each other in the first direction can be connected through the cooperation of the protruding structure and the winding member, and the structure is simple, the design is ingenious, and the connection strength is high and the stability is good.

[0020] In some embodiments, the winding member comprises any one of a strap or a clamp.

[0021] Thus, reliable connection of the adjacent battery cells can be achieved with a simple structure, and the strap and the clamp are low in cost, which is conducive to controlling the production cost.

[0022] In some embodiments, a through hole is formed on the shell, the protruding structure is formed in an integral structure with the shell, and a recessed space is formed on the side of the protruding structure facing the accommodation cavity, and the recessed space is in communication with the accommodation cavity through the through hole.

[0023] Thus, while the connection of the battery cells adjacent to each other in the first direction is achieved through the cooperation of the protruding structure and the winding member, the space in the battery cell can also be appropriately increased through the recessed space in the protruding structure, so that more electrolyte can be accommodated in the battery cell to improve the energy density of the battery. In addition, more gas generated during the electrochemical reaction can also be accommodated in the battery cell, thereby further reducing the possibility of swelling of the battery cell.

[0024] In some embodiments, the protruding structure extends in a second direction perpendicular to the first direction; and the first connecting member further comprises a limiting portion formed on the side of the protruding structure away from the battery cell in the second direction, and the limiting portions of the battery cells adjacent to each other extend away from each other in the first direction, and the limiting portion is used to limit the winding member from falling off the protruding structure.

[0025] Thus, the possibility of the winding member falling off the protruding structure of the adjacent battery cell can be reduced, and the connection reliability and stability of the connecting member can be further improved, so that the connecting member can better inhibit the swelling and deformation of the battery cell, thereby being conducive to improving the performance and use cycle life of the battery.

[0026] In some embodiments, one of the battery cells adjacent to each other in the first direction is provided with the first connecting member, and the other battery cell is provided with the second connecting member; and the first connecting member and the second connecting member are engaged with each other.

[0027] The snap connection has simple structure, is easy to install and disassemble, has high connection strength and good stability, can bear large pressure and vibration, and thus is favorable for improving the connection reliability between the battery monomers adjacent in the first direction and better inhibiting the expansion deformation degree of the battery monomers.

[0028] In some embodiments, the first connecting piece comprises a clamping hole, and the second connecting piece comprises a clasp.

[0029] Thus, the snap connection of the battery monomers adjacent in the first direction can be realized in a simple and fast manner. In addition, the quick positioning of the two adjacent battery monomers can be realized through the cooperation of the clamping hole and the clasp, and thus the assembly is more favorable.

[0030] In some embodiments, a pressure detection element is arranged between the first connecting piece and the second connecting piece cooperating with each other.

[0031] When the battery monomers expand, the connecting pieces will exert a pulling force on the battery monomers adjacent in the first direction towards each other, and the battery monomers will also exert a reverse force on the connecting pieces in the opposite direction of the pulling force. Therefore, a certain compression force exists between the first connecting piece and the second connecting piece. Therefore, the pressure detection element arranged between the first connecting piece and the second connecting piece can effectively detect the compression force between the first connecting piece and the second connecting piece, so that the expansion deformation degree of the battery monomers can be judged through the compression force, and the user can conveniently perform expansion monitoring and management.

[0032] In some embodiments, the connecting pieces connect the battery monomers adjacent in the first direction through an adhesive.

[0033] Thus, the battery monomers adjacent in the first direction can be connected through the adhesive, and the structure is simple and easy to assemble, which is favorable for reducing the production cost.

[0034] In some embodiments, the breaking strength of the connecting piece is greater than 8 MPa, and the breaking elongation of the connecting piece is greater than 10%.

[0035] Thus, when the battery monomers adjacent in the first direction expand, the connecting pieces are not prone to breaking, so that the connection strength between the battery monomers adjacent in the first direction can be better improved, and the expansion deformation degree of the battery monomers can be better limited.

[0036] In some embodiments, the connecting pieces connect the battery monomers adjacent in the first direction through welding.

[0037] Thus, the battery monomers adjacent in the first direction can be connected through welding, and the structure is simple and easy to assemble, which is favorable for reducing the production cost.

[0038] In some embodiments, the breaking strength of the connecting piece is greater than 8 MPa, and the breaking elongation of the connecting piece is greater than 10%.

[0039] In this way, when the battery monomers adjacent in the first direction expand, the connecting piece is less likely to break, thereby better improving the connecting strength between the battery monomers adjacent in the first direction and better limiting the degree of expansion and deformation of the battery monomers.

[0040] In some embodiments, the number of the battery monomer modules is multiple, and the multiple battery monomer modules are arranged in a third direction to form a battery monomer group; the third direction is perpendicular to the first direction and a second direction perpendicular to the first direction.

[0041] In this way, the battery monomer modules are grouped in the third direction, thereby increasing the energy density of the battery.

[0042] In some embodiments, the number of the battery monomer groups is multiple, and the multiple battery monomer groups are arranged in the second direction.

[0043] In this way, the energy density of the battery is further increased.

[0044] A second aspect of the present disclosure provides a power-using device, which comprises the battery of the first aspect of the present disclosure for providing electric energy.

[0045] The power-using device provided by the embodiments of the present disclosure has the battery which is less likely to expand and has good performance, thereby reducing the time spent on maintenance and having high reliability.

[0046] A third aspect of the present disclosure provides an energy storage device, which comprises the battery of the first aspect of the present disclosure for storing or providing electric energy.

[0047] The energy storage device provided by the embodiments of the present disclosure has the battery which is less likely to expand and has good performance, thereby reducing the time spent on maintenance and having high reliability.

[0048] Innovative effect

[0049] According to the present disclosure, the battery can improve the connecting strength between the battery monomers adjacent in the first direction through the connecting piece and reduce the degree of expansion and deformation of the battery monomers to a certain extent, thereby being beneficial to improving the performance and cycle life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0050] 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 with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the present disclosure. Identical reference numerals have been used, where possible, to designate identical elements common to the figures. In the drawings:

[0051] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present disclosure;

[0052] FIG. 2 is a perspective exploded schematic diagram of a box according to some embodiments of the present disclosure;

[0053] FIG. 3 is a perspective structural schematic diagram of a plurality of battery cell groups according to some embodiments of the present disclosure;

[0054] FIG. 4 is a perspective exploded schematic diagram of a battery cell according to some embodiments of the present disclosure;

[0055] FIG. 5 is a partial planar structural schematic diagram of an electrode assembly according to some embodiments of the present disclosure;

[0056] FIG. 6 is a planar structural schematic diagram of a battery cell module according to some embodiments of the present disclosure;

[0057] FIG. 7 is a planar structural schematic diagram of the battery cell module shown in FIG. 6 from another perspective;

[0058] FIG. 8 is a planar structural schematic diagram of another battery cell module according to some embodiments of the present disclosure;

[0059] FIG. 9 is a planar structural schematic diagram of the battery cell module shown in FIG. 8 from another perspective;

[0060] FIG. 10 is a planar structural schematic diagram of yet another battery cell module according to some embodiments of the present disclosure.

[0061] Legend of Reference Numerals

[0062] 1 - box; 1a - cover; 1b - bottom plate; 11 - containing space; 2 - battery cell module; 21 - battery cell; 211 - housing; 211a - containing cavity; 211b - housing wall; 2111 - first housing wall; 2112 - second housing wall; 212 - electrode assembly; 2121 - positive electrode sheet; 2122 - negative electrode sheet; 2123 - separator; 2124 - tab; 213 - pole; 3 - connecting member; 31 - first connecting member; 311 - protruding structure; 311a - limiting portion; 312 - clamping hole; 32 - second connecting member; 321 - winding member; 322 - clasp; 4 - busbar component; 5 - pressure detecting element; 6 - adhesive member; 7 - heat exchange assembly; 10 - battery cell group; 100 - battery; 200 - controller; 300 - motor; 1000 - vehicle. Detailed Implementation

[0063] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0064] 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 “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion.

[0065] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0066] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0067] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0068] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0069] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0070] In the description of the embodiments of the present disclosure, unless explicitly defined and limited otherwise, the technical term "contacting" should be understood broadly, which can be direct contact or contact through an intermediate medium layer, and can be contact between two elements in contact without interaction force, or contact between two elements in contact with interaction force.

[0071] Next, the present disclosure will be described in detail.

[0072] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only used in 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.

[0073] During the charging and discharging cycle of the battery cell in the battery, the internal electrode assembly, electrolyte and the like will undergo an electrochemical reaction, which will cause the electrode assembly to expand outward, and thus cause the battery cell to expand and deform. If the expansion and deformation of the battery cell cannot be effectively limited, the box containing the battery cell may be structurally deformed or bulged, thereby causing the air-tight seal of the battery to fail, making it easier for external moisture or impurities to enter the interior of the battery, adversely affecting the performance and service life of the battery.

[0074] In the related art, a plurality of fixed beams are usually arranged in the box, and a limiting structure such as a pressing plate is covered on the battery cell, and the fixed beams and the pressing plate are used to resist the expansion force of the battery cell to reduce the possibility of structural deformation of the battery cell and the box. However, the fixed beams and the pressing plate are arranged in the box, which introduces too many profiled beams and plates, not only making assembly difficult, but also occupying too much space in the box, resulting in a smaller space utilization rate in the box, which is not conducive to improving the energy density of the battery.

[0075] The battery provided by the embodiment of the present disclosure can be used in, but is not limited to, an electric device such as an energy storage power supply system, a vehicle, a ship or an aircraft, and an energy storage device such as an energy storage container or an energy storage cabinet.

[0076] Since the battery includes the connecting member connecting the adjacent battery cells, when the battery cells expand, the connecting member can apply a pulling force to the adjacent battery cells towards each other, thereby limiting the expansion of the battery cells to a certain extent, reducing the possibility of structural deformation of the box due to the expansion of the battery cells, and improving the reliability and stability of the battery, which is conducive to improving the performance and cycle life of the battery.

[0077] In addition, since the adjacent battery cells in the first direction are connected to each other by the connecting member, the box does not need to be provided with additional fixing beams, pressing plates or other structures, which can effectively reduce the overall weight of the battery and improve the space utilization in the box, thereby being conducive to improving the energy density of the battery.

[0078] The battery provided by the embodiment of the present disclosure can be used in, but is not limited to, an electric device such as an energy storage power supply system, a vehicle, a ship or an aircraft, and an energy storage device such as an energy storage container or an energy storage cabinet.

[0079] The embodiment of the present disclosure provides an electric device including the above-mentioned battery for providing electric energy, which includes but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, 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 aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0080] In the following embodiments, for the convenience of description, the electric device of the embodiment of the present disclosure is taken as a vehicle 1000 for example. The following will be described with reference to the accompanying drawings.

[0081] FIG. 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid electric vehicle, or a range extended electric vehicle, 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 source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0082] In some embodiments of the present disclosure, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0083] In the following, some embodiments of the present disclosure will be described in detail with reference to FIGS. 2-10.

[0084] FIG. 2 is a perspective exploded schematic diagram of a box according to some embodiments of the present disclosure. FIG. 3 is a perspective structural schematic diagram of a plurality of battery cell groups according to some embodiments of the present disclosure. FIG. 4 is a perspective exploded schematic diagram of a battery cell according to some embodiments of the present disclosure. FIG. 5 is a partial planar structural schematic diagram of an electrode assembly according to some embodiments of the present disclosure. FIG. 6 is a planar structural schematic diagram of a battery cell module according to some embodiments of the present disclosure. FIG. 7 is a planar structural schematic diagram of the battery cell module shown in FIG. 6 from another perspective. FIG. 8 is a planar structural schematic diagram of another battery cell module according to some embodiments of the present disclosure. FIG. 9 is a planar structural schematic diagram of the battery cell module shown in FIG. 8 from another perspective. FIG. 10 is a planar structural schematic diagram of still another battery cell module according to some embodiments of the present disclosure.

[0085] In some embodiments of the present disclosure, for the convenience of description, a first direction, a second direction, and a third direction are set, which are perpendicular to each other, but those skilled in the art should understand that the embodiments of the present disclosure are not limited to the case that the three directions are perpendicular to each other. For the convenience of description, as shown by the arrows in FIGS. 2-10, the direction in which the arrow X is located is the first direction, the direction in which the arrow Y is located is the second direction, and the direction in which the arrow Z is located is the third direction. Sometimes, the direction along which the arrow X points in the first direction is also referred to as “upward”, and the opposite direction is referred to as “downward”.

[0086] A first aspect of the present disclosure provides a battery 100, which comprises a box 1, at least one battery cell module 2, and at least one connecting piece 3. The box 1 is internally formed with an accommodation space 11 for accommodating battery cells 21, each battery cell module 2 comprises at least two battery cells 21, each battery cell 21 comprises a shell 211 and an electrode assembly 212 accommodated in an accommodation cavity 211a of the shell 211, the electrode assembly 212 comprises a positive electrode sheet 2121, a negative electrode sheet 2122, and a separator 2123 arranged in a stack along a first direction, and the at least two battery cells 21 of each battery cell module 2 are arranged along the first direction. The connecting piece 3 connects the battery cells 21 adjacent along the first direction, for applying a pulling force along the first direction towards each other to the battery cells 21 adjacent along the first direction in the case of swelling of the battery cells 21.

[0087] As shown in FIG. 2, the box 1 is an accommodation structure of the battery cells 21, and the box 1 comprises a cover 1a and a bottom plate 1b, the cover 1a is covered above the bottom plate 1b, so as to form the accommodation space 11 of the battery cells 21 between the bottom plate 1b and the cover 1a.

[0088] In the embodiments of the present disclosure, the box 1 is generally in the shape of a cuboid. In some other embodiments, the box 1 can also be in any other suitable shape such as a square, a cylinder, etc., and the embodiments of the present disclosure do not specifically limit the shape of the box 1 as long as the box 1 can accommodate the battery cells 21.

[0089] The battery cell 21 refers to a basic unit capable of realizing mutual conversion between chemical energy and electrical energy, and can be used to manufacture the battery cell module 2 or the battery 100, so as to supply power to an electric device or an energy storage device.

[0090] In the embodiments of the present disclosure, the battery cell 21 is a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging of the battery cell.

[0091] The battery cell 21 can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc., and the embodiments of the present disclosure are not limited thereto.

[0092] As shown in FIG. 4, the battery cell 21 comprises a shell 211 and an electrode assembly 212.

[0093] The shell 211 is an external protective shell of the battery cell 21, and an accommodation cavity 211a is formed inside the shell 211 for packaging the electrode assembly 212 and components such as electrolyte. The shell 211 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), or an aluminum-plastic film, etc.

[0094] The electrode assembly 212 is a component in which electrochemical reactions occur in the battery cell 21. The electrode assembly 212 is generally arranged in a stacked manner in the thickness direction (first direction) of the battery cell 21.

[0095] The electrode assembly 212 includes a positive electrode sheet 2121, a negative electrode sheet 2122, and a separator 2123. During charging and discharging of the battery cell 21, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode sheet 2121 and the negative electrode sheet 2122. The separator 2123 is provided between the positive electrode sheet 2121 and the negative electrode sheet 2122, and can function to prevent short-circuiting of the positive and negative electrode sheets while allowing the active ions to pass through.

[0096] In some embodiments, the positive electrode sheet 2121 can include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0097] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is provided on either one or both of the two surfaces of the positive electrode current collector.

[0098] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, nickel, or titanium, or the like can be employed. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0099] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each of them. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone only one kind, or two or more kinds can be used in combination. Among them, examples of the lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0100] In some embodiments, the positive electrode sheet 2121 can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. When the foamed metal is used as the positive electrode, the surface of the foamed metal can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal, which is lithium metal and / or a lithium-rich material.

[0101] In some embodiments, the negative electrode sheet 2122 can include a negative electrode current collector.

[0102] As an example, the negative electrode current collector can employ a metal foil, foamed metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, nickel, carbon, or titanium, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foamed alloy, etc. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0103] In some embodiments, the separator 2123 is a separator film. The present disclosure does not have a particular limitation on the type of separator film, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be used.

[0104] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic.

[0105] In some embodiments, the separator 2123 is a solid-state electrolyte.

[0106] In some embodiments, the electrode assembly 212 is a roll structure. The positive electrode sheet and the negative electrode sheet are rolled to form the roll structure.

[0107] In some embodiments, the electrode assembly 212 is a stack structure.

[0108] As an example, a plurality of positive electrode sheets 2121 and a plurality of negative electrode sheets 2122 can be alternately stacked.

[0109] As an example, a plurality of positive electrode sheets 2121 can be provided, and the negative electrode sheet 2122 is folded to form a plurality of folded segments which are stacked. One positive electrode sheet 2121 is interposed between adjacent folded segments.

[0110] As an example, the positive electrode sheet 2121 and the negative electrode sheet 2122 are each folded to form a plurality of folded segments arranged in a stack.

[0111] As an example, as shown in FIG. 5, a plurality of separators 2123 can be provided, each provided between any adjacent positive electrode sheet 2121 or negative electrode sheet 2122.

[0112] As an example, the separators 2123 can be provided continuously, by being folded or wound between any adjacent positive electrode sheet 2121 or negative electrode sheet 2122.

[0113] In some embodiments, the battery cell 21 further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not specifically limited in the present disclosure and can be selected as desired. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0114] In some embodiments, the electrode assembly 212 is provided with a tab 2124, which can conduct current out of or into the electrode assembly 212. The tab 2124 includes a positive electrode tab and a negative electrode tab.

[0115] In the battery 100, the battery cells 21 can be multiple, which can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that some of the battery cells 21 are connected in series and some are connected in parallel. The multiple battery cells 21 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 21 can be placed in the accommodation space 11 formed by the bottom plate 1b and the cover 1a. Of course, the battery cells 21 can also be in the form of a battery cell module 2, where the multiple battery cells 21 are first connected in series, in parallel, or in a mixed connection, and the multiple battery cell modules 2 are then connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the accommodation space formed by the bottom plate 1b and the cover 1a. The battery 100 can further include other structures, for example, as shown in FIG. 3, the battery 100 can further include a busbar 4, which connects the pole 213 of the battery cell 21 of adjacent battery cells 21 or of the battery cell 21 of adjacent battery cell modules 2, for realizing electrical connection between the multiple battery cells 21 or the multiple battery cell modules 2. The busbar 4 can also be referred to as a connecting tab.

[0116] In the embodiments of the present disclosure, the battery cell module 2 refers to a single physical module including at least two battery cells 21 arranged in a first direction to provide higher voltage and capacity.

[0117] The first direction refers to the direction in which the positive electrode sheet 2121, the negative electrode sheet 2122, and the separator 2123 of the electrode assembly 212 are arranged in a stack, and the first direction can also be referred to as the thickness direction of the battery cell 21. In the specific examples shown in FIGS. 5 to 10, the up-down direction in the figures is the first direction.

[0118] The connecting piece 3 refers to a structure for connecting two objects or two structures.

[0119] When the adjacent battery monomers 21 expand, they will move away from each other along the first direction under the action of the expansion force. Since the battery 100 of the embodiment of the present disclosure includes the connecting piece 3, and the connecting piece 3 can connect the adjacent battery monomers 21 along the first direction, when the battery monomers 21 expand, the battery monomers 21 moving away from each other will exert a pulling force on the connecting piece 3 connecting them, and the connecting piece 3 will exert a reverse pulling force on the adjacent battery monomers 21 along the first direction, thereby limiting the expansion of the battery monomers 21 to a certain extent, reducing the possibility of structural deformation of the box 1 due to the expansion of the battery monomers 21, and improving the reliability and stability of the battery 100, which is conducive to improving the performance and service life of the battery 100.

[0120] In addition, since the adjacent battery monomers 21 along the first direction are connected to each other through the connecting piece 3, there is no need to set additional fixing beams, pressing plates and other structures in the box, which can effectively reduce the overall weight of the battery 100 and improve the space utilization rate in the box 1, thereby being conducive to improving the energy density of the battery 100.

[0121] In some embodiments of the present disclosure, the shell 211 includes a plurality of shell walls 211b, and the shell walls 211b include a first shell wall 2111, which is the shell wall with the largest area among the plurality of shell walls 211b. The battery monomer 21 is arranged in the accommodation space 11 in a manner that the first shell wall 2111 is parallel to the bottom plate 1b of the box 1.

[0122] The shell wall 211b is an external protection structure of the battery monomer 21, and the plurality of shell walls 211b surround to form the shell 211, and an accommodation cavity 211a for accommodating the electrode assembly 212, electrolyte and the like is formed inside.

[0123] As shown in FIG. 4, the embodiment of the present disclosure takes a square cell as an example, which includes two shell walls 211b arranged opposite along the second direction, two shell walls 211b arranged opposite along the third direction, and two shell walls 211b arranged opposite along the first direction, wherein the two shell walls 211b arranged opposite along the first direction are the first shell wall 2111, which can also be referred to as the large face of the battery monomer 21, i.e., the surface with the largest area.

[0124] As shown in FIG. 3, the battery cells 21 are arranged in a large surface downward lying manner in the box body 1, that is, in the embodiment of the present disclosure, the first direction in which the battery cells 21 in each battery cell module 2 are arranged is parallel to the direction of gravity, and the battery 100 composed of the battery cells 21 arranged in the lying manner is more suitable for an installation space which is narrow in the thickness direction (the first direction) and spacious in the horizontal direction (the third direction).

[0125] In addition, when the battery cells 21 arranged in the lying manner occur thermal runaway, the eruption material generated by the thermal runaway does not erupt upward, but erupts laterally, thereby not easily affecting the surrounding battery cells, so that the spread of thermal runaway is not easy to occur, and the reliability is higher and the stability is better.

[0126] In some embodiments of the present disclosure, the shell wall 211b further comprises a second shell wall 2112. The connecting piece 3 connects the adjacent second shell walls 2112 of the adjacent battery cells 21 along the first direction.

[0127] The second shell wall 2112 refers to the shell wall 211b other than the first shell wall 2111, that is, the shell wall 211b other than the shell wall 211b with the largest area (the large surface of the battery cell 21) is referred to as the second shell wall 2112. Exemplarily, when the battery cell 21 further comprises a top cover, if the top cover is not the surface with the largest area, the top cover can also be referred to as the second shell wall 2112.

[0128] As shown in FIGS. 3, 6 to 10, when the battery cells 21 in each battery cell module 2 are arranged along the first direction, the adjacent battery cells 21 are usually arranged side by side with the first shell walls 2111 facing each other, and the second shell walls 2112 are located around the first shell walls 2111. Moreover, in the case of expansion of the battery cell 21, the electrode assembly 212 usually expands along the stacking direction thereof (i.e., the first direction), and therefore, the first shell wall 2111 of the battery cell 21 is most likely to expand and deform.

[0129] In the embodiment of the present disclosure, the connecting piece 3 connects the adjacent second shell walls 2112 of the adjacent battery cells 21 along the first direction, thereby being able to exert a pulling force on the adjacent second shell walls 2112 towards each other, so as to drive the first shell walls 2111 to be able to approach and adhere to each other, and further being able to effectively reduce the expansion degree of the battery cell 21 along the first direction, and improve the reliability of the battery 100.

[0130] The connecting member 3 can connect only one set of adjacent second case walls 2112 of the battery monoblocs 21 adjacent in the first direction, or can connect multiple sets of adjacent second case walls 2112 of the battery monoblocs 21 adjacent in the first direction. Taking the prismatic battery monobloc of the present disclosure as an example, two battery monoblocs 21 arranged side by side in the first direction include four sets of adjacent second case walls 2112, and each set of adjacent second case walls 2112 can be connected by the connecting member 3, so as to better limit the degree of swelling deformation of the battery monoblocs 21. In some other embodiments, only one, two or three sets of adjacent second case walls 2112 can be connected by the connecting member 3.

[0131] When multiple sets of adjacent second case walls 2112 of the battery monoblocs 21 adjacent in the first direction are connected by the connecting member 3, the types of the connecting member 3 connecting each set of adjacent second case walls 2112 can be the same or different.

[0132] Those skilled in the art should understand that when the adjacent second case walls 2112 connected by the connecting member 3 are the case walls 211b containing the pole 213, the connecting position of the connecting member 3 should avoid the position of the pole 213.

[0133] In some embodiments of the present disclosure, the connecting member 3 includes a first connecting member 31 and a second connecting member 32, and at least the first connecting member 31 is provided on the battery monobloc 21. The battery monoblocs 21 adjacent in the first direction are connected by the cooperation of the first connecting member 31 and the second connecting member 32.

[0134] Therefore, the adjacent battery monoblocs 21 in each battery monobloc module 2 can be connected to each other by the cooperation of the first connecting member 31 and the second connecting member 32 in a simple structure and an easy way, the connection strength between the battery monoblocs 21 adjacent in the first direction is improved, and the degree of swelling deformation of the battery monoblocs 21 is reduced.

[0135] For example, the cooperation of the first connecting member 31 and the second connecting member 32 includes, but is not limited to, a clamping cooperation, a plug-in cooperation, a binding cooperation, a threaded cooperation, etc.

[0136] In some embodiments of the present disclosure, as shown in FIGS. 6 and 7, the first connecting member 31 includes a protruding structure 311 provided on the battery monobloc 21. The second connecting member 32 includes a winding member 321 wound around the protruding structure 311 provided on the battery monoblocs 21 adjacent in the first direction.

[0137] The protruding structure 311 refers to a region on the surface of an object that is higher or more protruding than the surrounding region. In the embodiments of the present disclosure, the protruding structure 311 is formed on each of the second housing walls 2112 of the two battery cells 21 adjacent in the first direction to be connected. The protruding structure 311 can be formed in an integral structure with the second housing wall 2112, or can be formed in a separate structure from the second housing wall 2112 and then assembled together.

[0138] The winding member 321 refers to a component capable of winding around the outer periphery of the protruding structure 311 on the adjacent second housing wall 2112 to connect the two protruding structures 311 of the adjacent second housing walls 2112 together.

[0139] Exemplarily, the protruding structure 311 can be generally in the shape of a rectangular block, and the winding member 321 can be generally in the shape of a band or a strip.

[0140] In this way, the battery cells adjacent in the first direction can be connected through the cooperation of the protruding structure 311 and the winding member 321, which is simple in structure, ingenious in design, and high in connection strength and stability.

[0141] In the embodiments of the present disclosure, each of the battery cells 21 adjacent in the first direction is provided with two protruding structures 311, the two protruding structures 311 are arranged on the same housing wall 211b and are spaced apart in the third direction, that is, the housing walls 211b adjacent to each other of the battery cells 21 adjacent in the first direction are provided with a total of four protruding structures 311, and each two protruding structures 311 are arranged correspondingly. The number of winding members 321 is two, and each winding member 321 winds around the outer periphery of the two protruding structures 311 arranged correspondingly to connect the adjacent battery cells 21.

[0142] In some other embodiments, only one winding member 321 can be used to wind around the outer periphery of the four protruding structures 311 of the battery cells 21 adjacent in the first direction to connect the adjacent battery cells 21.

[0143] In some other embodiments, the battery cells 21 adjacent in the first direction can also be provided with more (more than two) or fewer (one) protruding structures 311 or more winding members 321.

[0144] When the protruding structures 311 are arranged on each group of adjacent housing walls 211b of the battery cells 21 adjacent in the first direction, the number of protruding structures 311 on each group of adjacent housing walls 211b can be the same or different.

[0145] The number of the protruding structures 311 and the wrapping member 321 is not specifically limited in the embodiments of the present disclosure, as long as the battery cells 21 adjacent in the first direction within the battery cell module 2 can be stably connected.

[0146] In some embodiments of the present disclosure, the wrapping member 321 includes any one of a bandage or a clamp.

[0147] The bandage is a band-shaped member capable of being wrapped. The clamp is a connecting device capable of clamping two components to be connected.

[0148] The embodiments of the present disclosure can wrap the protruding structures 311 of the battery cells 21 adjacent in the first direction by the bandage or the clamp, so that the reliable connection of the adjacent battery cells 21 can be achieved with a simple structure, and the cost of the bandage and the clamp is relatively low, which is conducive to controlling the production cost.

[0149] Of course, those skilled in the art should understand that in some other embodiments, the wrapping member 321 can also be any other suitable type of wrapping member.

[0150] In some embodiments of the present disclosure, a through hole is formed on the housing 211, the protruding structures 311 are formed in an integral structure with the housing 211, and the protruding structures 311 are formed with a recessed space on the side facing the accommodation cavity 211a, and the recessed space is in communication with the accommodation cavity 211a through the through hole.

[0151] In this way, while the connection of the battery cells 21 adjacent in the first direction is achieved by the cooperation of the protruding structures 311 and the wrapping member 321, the space in the battery cell 21 can also be appropriately increased by the recessed space in the protruding structure 311, so that more electrolyte can be accommodated in the battery cell 21, thereby improving the energy density of the battery 100.

[0152] In addition, more gas generated during the electrochemical reaction can also be accommodated in the battery cell 21, thereby further reducing the possibility of swelling of the battery cell 21.

[0153] Of course, those skilled in the art should understand that in some other embodiments, the protruding structures 311 can also be in a split structure with the housing 211 and then assembled together, as long as the recessed space of the protruding structures 311 can be in communication with the accommodation cavity 211a of the housing 211.

[0154] In some embodiments of the present disclosure, the protruding structure 311 extends along a second direction perpendicular to the first direction. The first connecting member 31 further comprises a limiting portion 311a formed on a side of the protruding structure 311 away from the battery monomer 21 along the second direction, and the limiting portions 311a of the battery monomers 21 adjacent to each other along the first direction extend away from each other along the first direction, and the limiting portions are used to limit the winding member 321 from falling off the protruding structure 311.

[0155] The limiting portion 311a refers to a component capable of playing a certain displacement limiting role.

[0156] In the embodiments of the present disclosure, the protruding structure 311 provided with the limiting portion 311a is generally in the shape of an inverted "L". By providing the limiting portion 311a, the possibility of the winding member 321 falling off the protruding structure 311 of the battery monomer 21 adjacent to each other along the first direction can be reduced, and the connection reliability and stability of the connecting member 3 can be further improved, so that the connecting member 3 can better inhibit the degree of swelling and deformation of the battery monomer 21, thereby reducing the possibility of structural deformation of the box body 1, and being beneficial to improve the performance and use cycle life of the battery 100.

[0157] Exemplarily, in some other embodiments, no limiting portion 311a can be formed on the protruding structure 311, and a concave-convex structure can be provided on the outer peripheral surface of the protruding structure 311, so as to increase the friction between the winding member 321 and the outer peripheral surface of the protruding structure 311, and reduce the possibility of the winding member 321 falling off the protruding structure 311.

[0158] Exemplarily, the protruding structure 311 can be provided in the shape of a wedge, and the smaller end of the wedge-shaped protruding structure 311 is connected with the shell wall 211b of the battery monomer 21, and the larger end is provided away from the shell wall 211b, so that the possibility of the winding member 321 wound on the outer peripheral surface of the protruding structure 311 falling off can also be reduced.

[0159] The embodiments of the present disclosure do not specifically limit the shape of the protruding structure 311, as long as the winding member 321 is not easy to fall off.

[0160] In some embodiments of the present disclosure, as shown in FIGS. 8 and 9, one of the battery monomers 21 adjacent to each other along the first direction is provided with the first connecting member 31, and the other battery monomer 21 is provided with the second connecting member 32. The first connecting member 31 and the second connecting member 32 are engaged with each other.

[0161] The structure of the engagement connection is simple, easy to install and disassemble, and has high connection strength and good stability, and can withstand large pressure and vibration, thereby being beneficial to improve the connection reliability between the battery monomers 21 adjacent to each other along the first direction, and better inhibit the degree of swelling and deformation of the battery monomers 21.

[0162] Exemplarily, the first connecting piece 31 and the second connecting piece 32 can be formed in an integral structure with the battery monomer 21, or can be in a split structure with the battery monomer 21 and then assembled together.

[0163] In some embodiments of the present disclosure, the first connecting piece 31 comprises a clamping hole 312, and the second connecting piece 32 comprises a clamping buckle 322.

[0164] Therefore, the clamping connection of the battery monomers 21 adjacent in the first direction can be achieved in a simple and fast manner.

[0165] In addition, the clamping hole 312 and the clamping buckle 322 can be matched to realize the quick positioning of the two adjacent battery monomers 21, thereby facilitating the assembly.

[0166] Exemplarily, the clamping hole 312 can be a through hole or a blind hole.

[0167] The shape of the clamping hole 312 and the clamping buckle 322 is not specifically limited in the embodiments of the present disclosure, as long as the clamping hole 312 and the clamping buckle 322 can be clamped and matched with each other.

[0168] In the embodiments of the present disclosure, each of the battery monomers 21 adjacent in the first direction is provided with one clamping hole 312 and one clamping buckle 322, and the clamping hole 312 and the clamping buckle 322 are arranged on the same shell wall 211b of the battery monomer 21, and the two battery monomers 21 are clamped and connected through the matching of the two groups of clamping holes 312 and clamping buckles 322.

[0169] In some other embodiments, one of the battery monomers 21 adjacent in the first direction can be provided with only a clamping hole 312, and the other battery monomer 21 can be provided with only a clamping buckle, and the two battery monomers 21 are clamped and connected through the matching of the clamping hole 312 and the clamping buckle 322.

[0170] The arrangement manner and the number of the clamping hole 312 and the clamping buckle 322 are not specifically limited in the embodiments of the present disclosure, as long as the clamping connection between the two battery monomers 21 adjacent in the first direction can be realized.

[0171] In some embodiments of the present disclosure, the pressure detection element 5 is arranged between the first connecting piece 31 and the second connecting piece 32 matched with each other.

[0172] The pressure detection element 5 refers to an electronic component capable of detecting pressure.

[0173] When the battery monomer expands, the connecting piece 3 will exert a pulling force on the battery monomers 21 adjacent in the first direction towards each other, and the battery monomers 21 will also exert a counterforce on the connecting piece 3 in the opposite direction of the pulling force, so that the first connecting piece 31 and the second connecting piece 32 will have a certain compression force between each other. Therefore, by arranging the pressure detection element 5 between the first connecting piece 31 and the second connecting piece 32, the compression force between the first connecting piece 31 and the second connecting piece 32 can be effectively detected, so that the degree of expansion and deformation of the battery monomer 21 can be judged by the compression force, facilitating the user to monitor and manage the expansion.

[0174] Exemplarily, the pressure detection element 5 is arranged between the surfaces of the first connecting piece 31 and the second connecting piece 32 facing each other, so that when the battery monomer 21 expands and deforms, the compression force between the first connecting piece 31 and the second connecting piece 32 can be detected.

[0175] The pressure detection element 5 includes but is not limited to a pressure sensor.

[0176] In some embodiments of the present disclosure, as shown in FIG. 10, the connecting piece 3 connects the battery monomers 21 adjacent in the first direction through the adhesive 6.

[0177] The adhesive 6 has adhesion and is a kind of adhesive that connects the same or two or more homogeneous or heterogeneous structures (or materials) together by interfacial action (chemical force or physical force).

[0178] The adhesive 6, for example, includes an adhesive tape including but not limited to a double-sided tape, and an adhesive layer including but not limited to a high-temperature resistant glue and the like.

[0179] In some embodiments, the connecting piece 3 may, for example, include a plate-shaped connecting piece or a strip-shaped connecting piece, and the plate-shaped or strip-shaped connecting piece 3 is provided with the adhesive 6 at both ends in the first direction and adheres to the adjacent casing walls 211b of the battery monomers 21 adjacent in the first direction through the adhesive 6. Therefore, the connecting piece 3 can connect the battery monomers 21 adjacent in the first direction by means of adhesion, and the structure is simple, easy to assemble, and conducive to reducing production costs.

[0180] In some other embodiments, the adhesive 6 can also be prearranged on the casing wall 211b of the battery monomer 21, and then the connecting piece 3 is adhered to the casing wall 211b of the battery monomer 21 adjacent in the first direction.

[0181] The plate-shaped or strip-shaped connecting piece 3 is easy to process and occupies less space, which is more conducive to improving the space utilization rate in the box 1 of the battery 100.

[0182] The material of the connecting piece 3 includes but is not limited to metal, alloy, polymer, rubber and the like.

[0183] In some embodiments of the present disclosure, the connecting piece 3 connects the battery monomers 21 adjacent in the first direction by welding.

[0184] Therefore, the battery monomers 21 adjacent in the first direction can also be connected by welding, which is simple in structure and easy to assemble, and is conducive to reducing production costs.

[0185] The specific welding methods include but are not limited to laser filler welding, laser traditional welding, arc welding, etc.

[0186] In some embodiments of the present disclosure, the breaking strength of the connecting piece 3 is greater than 8 MPa, and the breaking elongation of the connecting piece 3 is greater than 10%.

[0187] The breaking strength refers to the maximum stress when the material breaks. The breaking strength can be measured by the tensile strength test method.

[0188] The breaking elongation refers to the percentage of the length of the material elongation to the original length when the material breaks under the action of tensile force. The breaking elongation can be measured according to the national standard GB / T 228.1-2021.

[0189] The connecting piece 3 has appropriate breaking strength and breaking elongation, which is not easy to break and damage when the battery monomer 21 expands and deforms, thereby better improving the connection strength between the battery monomers 21 adjacent in the first direction, and better limiting the degree of expansion and deformation of the battery monomer 21.

[0190] In some embodiments of the present disclosure, as shown in FIG. 3, the number of battery monomer modules 2 is multiple, and the multiple battery monomer modules 2 are arranged in a third direction to form a battery monomer group 10. The third direction is perpendicular to the first direction and the second direction perpendicular to the first direction.

[0191] Therefore, the battery monomer modules 2 are grouped in the third direction, and the energy density of the battery 100 is increased.

[0192] The embodiments of the present disclosure do not specifically limit the number of battery monomer modules 2 in the battery monomer group 10.

[0193] In some embodiments of the present disclosure, the number of battery monomer groups 10 is multiple, and the multiple battery monomer groups 10 are arranged in the second direction.

[0194] Therefore, the energy density of the battery 100 is further increased.

[0195] As shown in FIG. 3, the two battery cell groups 10 can be arranged back to back along the second direction, that is, the battery cells 21 in the two battery cell groups 10 have the shell walls 211b of the pole sides facing away from each other along the second direction, and the heat exchange assembly 7 is arranged between the two battery cell groups 10, so that the heat management of the two battery cell groups 10 can be realized at the same time, so that the battery cells 21 in the battery cell groups 10 can all work in the normal temperature range, which is beneficial to improve the service life and charge-discharge performance of the battery 100.

[0196] Exemplarily, the heat exchange assembly 7 includes but is not limited to a water-cooled plate, a heating film, a PTC heating body, etc., and the heat exchange medium flowing into the water-cooled plate can be a low-temperature medium for heat dissipation or a high-temperature medium for heating.

[0197] The second aspect of the present disclosure provides a power utilization device, which comprises the battery 100 of the first aspect of the present disclosure for providing electric energy.

[0198] The power utilization device provided by the embodiments of the present disclosure adopts the battery 100 which is not prone to swelling and has good performance, so that the time spent on maintenance is reduced, and the reliability is high.

[0199] The third aspect of the present disclosure provides an energy storage device, which comprises the battery 100 of the first aspect of the present disclosure for storing or providing electric energy.

[0200] The energy storage device provided by the embodiments of the present disclosure adopts the battery 100 which is not prone to swelling and has good performance, so that the time spent on maintenance is reduced, and the reliability is high.

[0201] Hereinafter, specific examples of some embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0202] As a specific example, the battery 100 comprises a plurality of battery cell modules 2, each battery cell module 2 comprises at least two battery cells 21, the battery cells 21 are arranged in groups along the first direction and are placed horizontally, a connecting piece 3 is arranged on the shell wall 211b of the battery cell 21, and the connecting piece 3 connects the battery cells 21 in the upper and lower layers along the first direction.

[0203] The connecting piece 3 includes the following three forms:

[0204] Form one: the adjacent second shell walls 2112 of the adjacent battery cells 21 along the first direction are connected with the connecting piece 3 and the battery cells 21 in the upper and lower layers by means of gluing or welding.

[0205] Form two: the protruding structure 311 is arranged on the adjacent second shell wall 2112 of the adjacent battery monomer 21 along the first direction, and the protruding structures 311 of the upper and lower two layers of battery monomers 21 are bound by the winding member 321 such as a band or a hoop.

[0206] Form three: the card hole 312 and the buckle 322 are arranged on the adjacent second shell wall 2112 of the adjacent battery monomer 21, and the upper and lower two layers of battery monomers 21 are connected by the cooperation of the card hole 312 and the buckle 322.

[0207] Therefore, the upper and lower two layers of battery monomers 21 in the flat lying battery can be connected by the connecting member 3, the overall structural strength is improved, the degree of expansion and deformation of the battery monomer 21 is reduced, the deformation resistance is improved, and the performance and service life of the flat lying battery 100 are improved.

[0208] The above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; 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 comprising: a case in which a receiving space for receiving battery cells is formed; at least one battery cell module each including at least two battery cells each including a case and an electrode assembly received in a receiving cavity of the case, the electrode assembly including a positive electrode sheet, a negative electrode sheet, and a separator arranged in a stack in a first direction, the at least two battery cells of each battery cell module being arranged in the first direction; and at least one connector connecting the battery cells adjacent in the first direction to apply a pulling force toward each other in the first direction to the battery cells adjacent in the first direction in case of swelling of the battery cells. 2.The battery according to claim 1, wherein the case includes a plurality of case walls including a first case wall that is the case wall having the largest area among the plurality of case walls, the battery cells are arranged in the receiving space with the first case wall parallel to a floor of the case. 3.The battery according to claim 1 or 2, wherein the case walls further include a second case wall, the connector connects adjacent second case walls of the battery cells adjacent in the first direction. 4.The battery according to any one of claims 1 to 3, wherein the connector includes a first connector and a second connector, at least the first connector being provided to the battery cells, the battery cells adjacent in the first direction are connected by cooperation of the first connector and the second connector. 5.The battery according to claim 4, wherein the first connector includes a protruding structure provided to the battery cell, the second connector includes a winding member wound around the protruding structure provided to the battery cells adjacent in the first direction. 6.The battery according to claim 5, wherein the winding member includes any one of a strap or a clamp. 7.The battery according to claim 5 or 6, wherein a through hole is formed in the case, the protruding structure is formed in an integrated structure with the case, and a recessed space is formed in a side of the protruding structure facing the receiving cavity, the recessed space being communicated with the receiving cavity through the through hole. 8.The battery according to any one of claims 5 to 7, wherein the protruding structure extends in a second direction perpendicular to the first direction, the first connector further includes a limiting portion formed in a side of the protruding structure facing away from the battery cell in the second direction, and the limiting portions of the battery cells adjacent in the first direction extend away from each other in the first direction, the limiting portions being for limiting the winding member from being detached from the protruding structure. 9.The battery according to claim 4, wherein one of the battery cells adjacent in the first direction is provided with the first connector, and the other battery cell is provided with the second connector. ​ The first connecting member and the second connecting member are engaged with each other.

10. The battery according to claim 9, wherein The first connecting member includes a clamping hole, and the second connecting member includes a clasp.

11. The battery according to claim 4, wherein A pressure detecting element is provided between the first connecting member and the second connecting member which are engaged with each other.

12. The battery according to any one of claims 1 to 3, wherein The connecting member connects the battery cells adjacent in the first direction by an adhesive.

13. The battery according to claim 12, wherein The breaking strength of the connecting member is greater than 8 MPa, and the breaking elongation of the connecting member is greater than 10%.

14. The battery according to any one of claims 1 to 3, wherein The connecting member connects the battery cells adjacent in the first direction by welding.

15. The battery according to claim 14, wherein The breaking strength of the connecting member is greater than 8 MPa, and the breaking elongation of the connecting member is greater than 10%.

16. The battery according to any one of claims 1 to 15, wherein The number of the battery cell modules is plural, and the plural battery cell modules are arranged in a third direction to form a battery cell group. The third direction is perpendicular to the first direction and a second direction perpendicular to the first direction.

17. The battery according to claim 16, wherein The number of the battery cell groups is plural, and the plural battery cell groups are arranged in the second direction.

18. An electric device, the electric device including the battery according to any one of claims 1 to 17 for supplying electric power.

19. An energy storage device, the energy storage device including the battery according to any one of claims 1 to 17 for storing or supplying electric power.

Images