Lower case body assembly of battery, battery and electrical apparatus

Abstract

A lower case body assembly of a battery, a battery and an electrical apparatus. The lower case body assembly comprises: a lower case body, an expansion beam and a heat exchange member, the expansion beam being mounted in the lower case body. A first portion of the lower surface of the expansion beam is connected to the bottom wall of the lower case body, the expansion beam and the lower case body forming a first containing cavity and a second containing cavity which are separated from each other. A second portion of the lower surface of the expansion beam and the bottom wall of the lower case body form a mounting cavity. The heat exchange member comprises heat exchange pipes and a flow collector, at least part of the flow collector being mounted in the mounting cavity.

Description

Lower case assembly of battery, battery and electric device

[0001] Cross-reference to related applications

[0002] The present application is based on the Chinese patent application No. 202420719442.0, filed on April 9, 2024, and claims the priority of the Chinese patent application No. 202420719442.0, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a lower case assembly of battery, a battery and an electric device. BACKGROUND

[0004] In general power batteries, a large amount of heat is generated in the use process of battery monomers under continuous charging and discharging, which causes the internal temperature of the battery to rise, seriously affecting the use performance and service life of the battery, and even causing a large security risk in the use process of the battery, which is not conducive to the use safety of consumers. Therefore, in the related technology, a thermal management system for cooling the battery monomers is usually arranged in the interior of the battery, the thermal management system has a current collector and a heat exchange pipe, the current collector integrates the water paths of the plurality of heat exchange pipes, and the internal temperature of the battery is reduced by heat exchange between the heat exchange pipe and the battery monomers. At the same time, the battery monomers will swell during charging and discharging, and the swelling of the battery monomers will cause the electrode assembly to be pulled and damaged, so an expansion beam is usually arranged in the case to inhibit the swelling of the battery monomers.

[0005] At present, the heat exchange pipe needs to pass through the expansion beam to communicate with the current collector, which causes the expansion beam to be unable to better resist the swelling force generated by the battery monomers, and the existence of the current collector occupies a large space and reduces the effective volume of the case.

[0006] SUMMARY

[0007] The present application provides a lower case assembly of battery, a battery and an electric device, which can improve the bonding strength of the expansion beam and the case, improve the reliability of the battery, reduce the occupation of the effective volume of the battery case by the current collector, and thus improve the space utilization rate of the interior of the battery case.

[0008] In a first aspect, the embodiments of the present application provide a lower box assembly of a battery, comprising: a lower box, an expansion beam and a heat exchange component, the expansion beam is installed in the lower box, a first part of a lower surface of the expansion beam is connected with a bottom wall of the lower box, the expansion beam and the lower box form a first accommodating cavity for accommodating battery monomers and a second accommodating cavity for accommodating electronic devices; wherein a second part of the lower surface of the expansion beam forms an installation cavity with the bottom wall of the lower box; the heat exchange component comprises a heat exchange pipe and a current collector communicating with the heat exchange pipe; wherein at least part of the current collector is installed in the installation cavity, the projection direction is perpendicular to the bottom wall, the projection plane is the bottom wall, and the part of the heat exchange pipe outside the current collector is completely in the union of the projection of the first accommodating cavity and the projection of the installation cavity on the bottom wall.

[0009] In the above technical solution, the lower surface of the expansion beam is divided into a first part and a second part, the current collector is located in the installation cavity formed by the second part and the bottom wall of the lower box, and the heat exchange pipe can communicate with the current collector without penetrating the expansion beam. On the one hand, the first part can be completely connected with the bottom wall of the lower box, the welding integrity of the expansion beam and the lower box is improved, the combination strength of the expansion beam and the lower box is improved, and the reliability of the battery is improved. On the other hand, at least part of the current collector is hidden inside the expansion beam, the occupation of the effective volume of the battery box by the current collector is reduced, and the space utilization rate inside the battery box is improved.

[0010] In some embodiments, the installation cavity is open on the side facing the first accommodating cavity.

[0011] In the above technical solution, the installation cavity is open on the side facing the first accommodating cavity, the heat exchange pipe can extend into the slot of the installation cavity to directly communicate with the current collector, and no hole needs to be punched on the expansion beam, so that the processing and assembly difficulty of the two is reduced, and the structural strength of the expansion beam itself is enhanced.

[0012] In some embodiments, the heat exchange pipe is installed on the inner side of the bottom wall, and the part of the heat exchange pipe outside the current collector is completely in the projection of the first accommodating cavity on the bottom wall.

[0013] In some embodiments, the heat exchange component further comprises a connecting pipe, the connecting pipe penetrates the bottom wall and communicates the heat exchange pipe and the current collector.

[0014] In some embodiments, the lower surface of the expansion beam comprises a first segment, a second segment and a third segment connected in sequence, the first segment forms the first part, the third segment is spaced apart from the bottom wall of the lower box, and the third segment forms the second part.

[0015] In some embodiments, the second segment forms an obtuse angle with the first segment and the third segment.

[0016] In some embodiments, the expansion beam comprises a first plate and a second plate connected in series, the first plate is located at a side close to the first accommodating cavity, the second plate is located at a side close to the second accommodating cavity, the first plate has the first segment, the second segment and the third segment.

[0017] In some embodiments, a part of the second plate is connected in series with the first segment and a bottom wall of the lower box.

[0018] In some embodiments, the expansion beam is provided with a first through hole communicated to the second accommodating cavity, a second part of a lower surface of the expansion beam is provided with a second through hole, the second through hole is communicated with the current collector by a water pipe, and the first through hole is used for the water pipe to extend into the second accommodating cavity.

[0019] In some embodiments, the expansion beam comprises a first plate and a second plate, a cavity is formed between the first plate and the second plate, and a part of the water pipe is located in the cavity.

[0020] In some embodiments, the expansion beam comprises a first expansion beam and a second expansion beam arranged at intervals, the first accommodating cavity is located between the first expansion beam and the second expansion beam, and the first expansion beam and the second expansion beam each form the mounting cavity at a side facing the first accommodating cavity.

[0021] In some embodiments, an upper surface of the current collector is connected to a second part of a lower surface of the expansion beam, and a lower surface of the current collector is connected to a bottom wall of the lower box.

[0022] In some embodiments, a part of the current collector is in the mounting cavity and another part is in the first accommodating cavity.

[0023] In the second aspect, the embodiments of the present application provide a battery, comprising:

[0024] The lower box assembly as described in any of the above embodiments;

[0025] A plurality of battery monomers, the plurality of battery monomers are installed in the first accommodating cavity.

[0026] In the above technical solution, the battery provided by the embodiments of the present application has the lower box assembly as described in any of the above embodiments, and can achieve the effects of the lower box assembly as described in any of the above embodiments.

[0027] In the third aspect, the embodiments of the present application provide a power utilization device, comprising:

[0028] The battery as described in any of the above embodiments is used to provide electric energy for the electric device.

[0029] In the above technical solution, the electric device provided by the embodiments of the present application has the battery as described in any of the above embodiments, and can achieve the effects of the battery as described in any of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0031] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0032] Fig. 2 is an exploded structural diagram of a battery provided by some embodiments of the present application;

[0033] Fig. 3 is a structural schematic diagram of a lower box assembly provided by some embodiments of the present application;

[0034] Fig. 4 is a structural schematic diagram of a lower box assembly provided by some embodiments of the present application;

[0035] Fig. 5 is a structural schematic diagram of a lower box assembly provided by some embodiments of the present application;

[0036] Fig. 6 is a structural schematic diagram of a lower box assembly provided by some embodiments of the present application;

[0037] Fig. 7 is a structural schematic diagram of a cooling water path provided by some embodiments of the present application.

[0038] Reference signs: vehicle 1, battery 10, box 11, first box body 111, lower box 1111, first expansion beam 1112, first plate 11121, first section 111211, second section 111212, third section 111213, second plate 11122, cavity 11123, second expansion beam 1113, first containing cavity 1114, second containing cavity 1115, mounting cavity 1116, second box body 112, battery monomer 12, current collector 13, water guide pipe 14, heat exchange pipe 15, connecting pipe 16, bubble layer 17, motor 20, controller 30. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, but not to describe a particular order or primary and secondary relationship.

[0041] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0044] In the present application, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0045] The battery cell mentioned in the embodiments of the present application can include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc., and the embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the embodiments of the present application are not limited thereto. The battery cell is generally classified into three types according to the packaging method: a cylindrical battery cell, a square battery cell, and a pouch battery cell, and the embodiments of the present application are not limited thereto.

[0046] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a case for packaging one or more battery cells or a plurality of battery modules. The case can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell.

[0047] The battery cell includes a housing, an electrode assembly, and an electrolyte, and the housing is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode tab, a negative electrode tab, and a separator. The battery cell mainly works by moving metal ions between the positive electrode tab and the negative electrode tab. The positive electrode tab includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector. The positive current collector that is not coated with the positive active material layer protrudes from the positive current collector that has been coated with the positive active material layer, and the positive current collector that is not coated with the positive active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode tab includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector. The negative current collector that is not coated with the negative active material layer protrudes from the negative current collector that has been coated with the negative active material layer, and the negative current collector that is not coated with the negative active material layer serves as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. In order to ensure that no fusing occurs when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0048] The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a roll type structure or a stacked type structure, and the embodiments of the present application are not limited thereto.

[0049] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. As a core component of new energy vehicles, batteries have high requirements in terms of safety and cycle life. The battery is composed of a box body and a plurality of battery monomers contained in the box body. The battery monomer is the smallest unit that constitutes the battery. During the charging and discharging process, the battery monomer will swell, and an expansion beam needs to be provided in the box body to suppress the swelling of the battery monomer. The expansion beam is a beam structure, and in order to better resist the swelling force generated by the battery monomer, the lower surface of the expansion beam is usually welded with the lower box body.

[0050] The inventors found that in general power batteries, a large amount of heat is generated in the battery monomers during continuous charging and discharging, which can cause the internal temperature of the battery to rise, seriously affecting the performance and service life of the battery, and even causing a large safety hazard during use, which is not conducive to the safety of consumers. Therefore, a thermal management system for cooling the battery monomers is usually provided inside the battery. The thermal management system in the related art has a current collector and a heat exchange pipe, which contacts the battery monomers for heat exchange, thereby reducing the internal temperature of the battery to cool the battery. However, the heat exchange pipe in the related art needs to pass through the expansion beam, reducing the area of the expansion beam welded with the lower box body, which cannot be fully welded, resulting in a reduction in the bonding strength of the expansion beam and the lower box body. At the same time, after the heat exchange pipe passes through the expansion beam, the waterway needs to be integrated with the current collector, and the presence of the current collector occupies a large space, reducing the effective volume of the box body.

[0051] Based on the above considerations, in order to improve the bonding strength of the expansion beam and the lower box body and improve the space utilization of the lower box body, the inventors have designed a lower box assembly of a battery, which includes a lower box body, an expansion beam and a heat exchange member. The expansion beam is installed in the lower box body, and a first part of the lower surface of the expansion beam is connected to the bottom wall of the lower box body. The expansion beam and the lower box body form a first accommodation cavity for accommodating battery monomers and a second accommodation cavity for accommodating electronic devices. The second part of the lower surface of the expansion beam forms a mounting cavity with the bottom wall of the lower box body. The heat exchange member includes a heat exchange pipe and a current collector communicating with the heat exchange pipe. At least part of the current collector is installed in the mounting cavity. The projection direction is perpendicular to the bottom wall, and the projection plane is the bottom wall. The part of the heat exchange pipe outside the current collector is completely within the union of the first accommodation cavity and the mounting cavity on the bottom wall.

[0052] In the lower box assembly of the battery of the structure, the lower surface of the expansion beam is divided into a first part and a second part, the current collector is located in the mounting cavity formed by the second part and the bottom wall of the lower box, and the heat exchange pipe can communicate with the current collector without penetrating the expansion beam. On the one hand, the first part can be completely connected with the bottom wall of the lower box, thereby improving the welding integrity of the expansion beam and the lower box, and thereby improving the bonding strength of the expansion beam and the box. On the other hand, at least part of the current collector is hidden inside the expansion beam, which can reduce the occupation of the current collector to the effective volume of the battery box, thereby improving the space utilization of the battery box.

[0053] The battery disclosed in the embodiments of the present application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto. The power supply system of the electric device can be composed of the lower box assembly, the battery and the like with the battery disclosed in the present application, so that the bonding strength of the expansion beam and the lower box is improved, and the space utilization of the box is improved.

[0054] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship and 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.

[0055] The following embodiments are described with reference to a vehicle as an example of an electric device of an embodiment of the present application for convenience of description.

[0056] As shown in FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1 can be provided with a motor 20, a controller 30 and a battery 10 inside. The controller 30 is used to control the power supply of the battery 10 to the motor 20. For example, the battery 10 can be arranged at the bottom, the front or the rear of the vehicle 1. The battery 10 can be used for power supply of the vehicle 1. For example, the battery 10 can be used as an operating power supply of the vehicle 1, and used for the circuit system of the vehicle 1, such as the power demand for starting, navigation and operation of the vehicle 1.

[0057] In another embodiment of the present application, the battery 10 can not only be used as an operating power supply of the vehicle 1, but also be used as a driving power supply of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0058] In order to meet different power demands, the battery 10 can include a plurality of battery cells 12, which can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a mixture of series and parallel connections.

[0059] As shown in FIG. 2, an exploded view of the structure of the battery 10 according to an embodiment of the present application is shown. The battery 10 includes a box 11 and a plurality of battery cells 12, which are accommodated in the box 11. The box 11 provides a mounting space for the battery cells 12, and can have various structures. In some embodiments, the box 11 can include a first box body 111 and a second box body 112, which are coupled to each other. The first box body 111 and the second box body 112 together define a mounting space for accommodating the battery cells 12. The second box body 112 can be a hollow structure with one end open, and the first box body 111 can be a plate structure. The first box body 111 is coupled to the open end of the second box body 112, so that the first box body 111 and the second box body 112 together define the mounting space. Alternatively, the first box body 111 and the second box body 112 can both be hollow structures with one end open, and the open end of the first box body 111 is coupled to the open end of the second box body 112. Of course, the box 11 formed by the first box body 111 and the second box body 112 can have various shapes, such as a cylindrical shape or a cuboid shape.

[0060] In the battery 10, the plurality of battery cells 12 can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a mixture of series and parallel connections among the plurality of battery cells 12. The plurality of battery cells 12 can be directly connected in series, in parallel, or in a mixed connection, and then the plurality of battery cells 12 are accommodated in the box 11. Alternatively, the plurality of battery cells 12 can be first connected in series, in parallel, or in a mixed connection to form a battery 10 module, and then a plurality of battery 10 modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 11.

[0061] The battery cell 12 refers to the smallest unit of the battery 10. During charging and discharging, the battery cell 12 can expand, and an expansion beam is provided in the box to suppress the expansion of the battery cell.

[0062] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIGS. 4, 5, and 6, which are structural schematic diagrams of a lower box assembly according to some embodiments of the present application.

[0063] The application provides a lower box assembly of a battery, comprising: a lower box 1111, an expansion beam and a heat exchange element, the expansion beam is installed in the lower box 1111, a first part of the lower surface of the expansion beam is connected with the bottom wall of the lower box 1111, the expansion beam and the lower box 1111 form a first containing cavity 1114 for containing battery monomers 12 and a second containing cavity 1115 for containing electronic devices; wherein a second part of the lower surface of the expansion beam and the bottom wall of the lower box 1111 form a mounting cavity 1116; the heat exchange element comprises a heat exchange pipe 15 and a current collector 13 communicating with the heat exchange pipe 15; wherein at least part of the current collector 13 is installed in the mounting cavity 1116, the projection direction is perpendicular to the bottom wall, the projection plane is the bottom wall, and the part of the heat exchange pipe 15 outside the current collector 13 is completely in the union of the projection of the first containing cavity 1114 and the projection of the mounting cavity 1116 on the bottom wall.

[0064] The lower box 1111 can be the first box body 111 or the second box body 112.

[0065] The first part of the lower surface of the expansion beam can be connected with the bottom wall of the lower box 1111 by welding or bonding, and the second part of the lower surface of the expansion beam can also be connected with the upper surface of the current collector 13 by welding or bonding.

[0066] The expansion beam is a beam structure, the expansion beam separates the lower box 1111 into the first containing cavity 1114 and the second containing cavity 1115, the lower surface of the expansion beam comprises a first part and a second part, the first part and the second part can be distributed along the width direction of the expansion beam, the first part is close to the second containing cavity 1115, the second part is close to the first containing cavity 1114, and the first part and the second part can extend along the length direction of the expansion beam.

[0067] The first part is connected with the bottom wall of the lower box 1111, the second part is arranged to be spaced apart from the bottom wall of the lower box 1111 to form the mounting cavity 1116, the second part forms a cavity wall of the mounting cavity 1116 with the bottom wall of the lower box 1111, and part or all of the current collector 13 is located in the mounting cavity 1116.

[0068] The mounting cavity 1116 can be a closed cavity or a groove structure with one side open.

[0069] In the embodiment, the current collector 13 is wholly or partially installed in the mounting cavity 1116, the first part of the lower surface of the expansion beam can be completely connected with the bottom wall of the lower box 1111, meanwhile, the lower surface of the current collector 13 can also be connected with the bottom wall of the lower box 1111, and the second part of the lower surface of the expansion beam can be connected with the upper surface of the current collector 13.

[0070] Exemplarily, the material of the expansion beam can be nickel-plated carbon steel such as SPCC, or stainless steel such as SUS304 or SUS316, etc. Of course, the material of the expansion beam can also be a composite material piece.

[0071] In the embodiment, the heat exchange pipe 15 is used to contact the battery monomer 12 to exchange heat with the battery monomer 12, and the current collector 13 is used to integrate the fluid in the plurality of heat exchange pipes 15 to realize heat exchange of the fluid. The end of the heat exchange pipe 15 is in communication with the current collector 13 to realize flow of the heat exchange fluid. Wherein, the fluid to be exchanged can be in liquid form, or in gas form, etc. For the purpose of simplifying the description, the fluid flowing through the heat exchange piece is taken as an example to be described hereinafter.

[0072] Wherein, the heat exchange pipe 15 can be arranged in the lower box body 1111, or arranged outside the lower box body 1111, which can be selected according to the actual structure.

[0073] In the related art, since the plurality of heat exchange pipes 15 need to pass through the expansion beam to be connected with the current collector 13 to integrate the waterway, the lower surface of the expansion beam and the bottom wall of the lower box body 1111 need to be spaced apart to form a channel for the heat exchange pipe 15 to pass through, so that the lower surface of the expansion beam cannot be completely welded with the bottom wall of the lower box body 1111, resulting in that the bonding strength of the expansion beam and the bottom wall of the lower box body 1111 is reduced, and the expansion force of the battery monomer 12 cannot be well resisted.

[0074] According to the lower box body assembly of the battery provided in the embodiment of the present application, the lower surface of the expansion beam is divided into a first part and a second part, the current collector 13 is located in the installation cavity 1116 formed by the second part and the bottom wall of the lower box body 1111, and the heat exchange pipe 15 can be in communication with the current collector 13 without penetrating the expansion beam, which on the one hand can realize complete connection between the first part and the bottom wall of the lower box body 1111, thereby improving the bonding strength of the expansion beam and the box body, and on the other hand, at least part of the current collector 13 is hidden inside the expansion beam, which can reduce the occupation of the effective volume of the battery box body by the current collector 13, thereby improving the space utilization rate inside the battery box body.

[0075] Wherein, the installation cavity 1116 at least has the following two structures:

[0076] Firstly, the installation cavity 1116 can be a closed cavity.

[0077] The collector 13 is located in the mounting cavity 1116, the lower surface of the collector 13 is in contact with the bottom wall of the lower box 1111, in the case that the heat exchange pipe 15 is located in the first containing cavity, the heat exchange pipe 15 can be in communication with the collector 13 by penetrating the cavity wall of the mounting cavity 1116, and the second part of the expansion beam needs to be perforated to realize the penetration of the heat exchange pipe 15; in the case that the heat exchange pipe 15 is externally located outside the lower box 1111, the heat exchange pipe 15 can be in communication with the collector 13 by penetrating the bottom wall of the lower box 1111, and the expansion beam does not need to be perforated.

[0078] Secondly, as shown in FIG. 4 and FIG. 6, the mounting cavity 1116 can be a groove, and the open side of the mounting cavity 1116 can be towards the first containing cavity 1114.

[0079] Part or all of the collector 13 is located in the groove, in the case that the heat exchange pipe 15 is located in the first containing cavity, the heat exchange pipe 15 can directly communicate with the collector 13 by extending into the slot of the mounting cavity 1116, without the need to perforate the expansion beam; in the case that the heat exchange pipe 15 is externally located outside the lower box, the heat exchange pipe 15 can be in communication with the collector 13 by penetrating the bottom wall of the lower box.

[0080] In the structure, the first part of the lower surface of the expansion beam and the lower surface of the collector 13 can be connected with the bottom wall of the lower box 1111, and the second part of the lower surface of the expansion beam can be connected with the upper surface of the collector 13.

[0081] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIG. 4, which is a structural schematic diagram of the lower box assembly according to some embodiments of the present application. The mounting cavity 1116 is open towards the first containing cavity 1114.

[0082] The second part of the lower surface of the expansion beam is spaced apart from the bottom wall of the lower box 1111 to form a groove, the second part of the lower surface of the expansion beam and the bottom wall of the lower box 1111 form a groove wall, the slot is towards the first containing cavity 1114, the heat exchange pipe 15 can directly communicate with the collector 13 by extending into the slot of the mounting cavity 1116, without the need to perforate the expansion beam, thereby reducing the processing and assembly difficulty, and enhancing the structural strength of the expansion beam itself.

[0083] In the embodiment, the projection of the first containing cavity 1114 and the mounting cavity 1116 on the bottom wall includes: the projection of the first containing cavity 1114 on the bottom wall, the projection of the mounting cavity 1116 on the bottom wall, and the sum of the projection of the first containing cavity 1114 and the projection of the mounting cavity 1116 on the bottom wall.

[0084] The setting position of the heat exchange pipe 15 can include at least the following two structures:

[0085] One, as shown in FIG. 4, the heat exchange pipe 15 is installed on the inner side of the bottom wall, and the part of the heat exchange pipe 15 outside the current collector 13 falls completely within the projection of the first accommodating cavity 1114 on the bottom wall.

[0086] In this embodiment, the heat exchange pipe 15 is arranged between the bottom wall of the lower box body 1111 and the battery monomer 1212, and the heat exchange pipe 15 directly contacts the battery monomer 1212 to achieve heat exchange. In the case of a closed cavity of the installation cavity 1116, the heat exchange pipe 15 can pass through the cavity wall of the installation cavity 1116 and communicate with the current collector 13. In the case of the installation cavity 1116 open to the first accommodating cavity 1114, the heat exchange pipe 15 can directly communicate with the current collector 13.

[0087] In this embodiment, the end of the heat exchange pipe 15 can directly communicate with the current collector 13, or pass through the cavity wall of the installation cavity 1116 and communicate with the current collector 13. At this time, the part of the heat exchange pipe 15 outside the current collector 13 falls completely within the projection of the first accommodating cavity 1114 on the bottom wall.

[0088] In this embodiment, by installing the heat exchange pipe 15 in the first accommodating cavity 1114, the lower box body 1111 does not need to be perforated, and the processing difficulty is reduced.

[0089] Second, as shown in FIG. 5, the heat exchange pipe 15 is installed on the outer side of the bottom wall.

[0090] In this embodiment, the heat exchange pipe 15 is arranged outside the lower box body 1111 and contacts the bottom wall of the lower box body 1111. The bottom wall of the lower box body 1111 contacts the battery monomer 1212, and the heat exchanger indirectly exchanges heat with the battery monomer 1212. One end of the heat exchange pipe 15 needs to pass through the bottom wall of the lower box body 1111 and extend into the installation cavity 1116 to communicate with the current collector 13. In the case that one end of the heat exchange pipe 15 passes through the bottom wall of the installation cavity 1116, the part of the heat exchange pipe 15 outside the current collector 13 falls within the projection of the installation cavity 1116 on the bottom wall, and the other part falls within the projection of the first accommodating cavity 1114 on the bottom wall. In the case that one end of the heat exchange pipe 15 passes through the bottom wall of the first accommodating cavity 1114 and extends into the installation cavity 1116, the part of the heat exchange pipe 15 outside the current collector 13 falls within the projection of the first accommodating cavity 1114 on the bottom wall.

[0091] In this embodiment, the heat exchange pipe 15 is arranged outside the lower box body 1111, which not only achieves the cooling of the battery monomer 1212, but also does not occupy the space of the lower box body 1111, improves the space utilization, and is convenient for assembly.

[0092] In some embodiments, as shown in FIG. 5, the heat exchange member further comprises a connecting pipe 16, which penetrates the bottom wall and communicates the heat exchange pipe 15 and the current collector 13.

[0093] The bottom wall is provided with an opening for the connection pipe 16 to pass through, one end of the connection pipe 16 communicates with the heat exchange pipe 15, and the other end communicates with the current collector 13. The fluid to be heated can be injected into the heat exchange pipe 15 through the current collector 13 and the connection pipe 16, the fluid flowing through the heat exchange pipe 15 exchanges heat with the battery monomer 1212 to achieve temperature regulation of the battery monomer 1212, and the heat-exchanged fluid flows out of the heat exchange pipe 15 and is discharged from the current collector 13 through the connection pipe 16.

[0094] The number of connection pipes 16 is not limited and can be one or more. Exemplarily, when the connection pipe 16 is one, the current collector 13 can include two independent sub-flow channels, and the heat exchange pipe 15 also has two independent sub-channels inside, one sub-flow channel corresponds to one sub-channel and is used to inject heat exchange liquid into the inlet of the heat exchange pipe 15, and the other sub-flow channel corresponds to the other sub-channel and is used to receive the heat exchange liquid discharged from the outlet of the heat exchange pipe 15.

[0095] Exemplarily, when the connection pipe 16 is two, the heat exchange pipe 15 is also two, one heat exchange pipe 15 injects heat exchange liquid into the inlet of the current collector 13 through one connection pipe 16, and the other heat exchange pipe 15 receives the heat exchange liquid discharged from the outlet of the current collector 13 through the other connection pipe 16. Of course, in other embodiments of the present application, the number of connection pipes 16 and heat exchange pipes 15 can also be different, for example, one heat exchange pipe 15 can communicate with multiple connection pipes 16, or multiple heat exchange pipes 15 can communicate with one connection pipe 16, etc. When the number of heat exchange pipes 15 and connection pipes 16 is the same and one-to-one correspondence, the structure and connection can be simplified.

[0096] Exemplarily, the number of connection pipes 16 can also be more than two, for example, it can be applicable to the case that the current collector 13 includes multiple parallel branches, each parallel branch corresponds to one or two connection pipes 16. Of course, the present application is not limited to this, in other embodiments of the present application, when the current collector 13 includes multiple parallel branches, the inlets of the multiple parallel branches can also share the same connection pipe 16, the outlets of the multiple parallel branches can also share the same connection pipe 16, or the inlets of the multiple parallel branches can also share the same sub-channel in the same connection pipe 16, and the outlets of the multiple parallel branches can also share another sub-channel in the same connection pipe 16.

[0097] Therefore, by externally arranging the heat exchange pipe 15 outside the lower box body 1111, the insulation and corrosion prevention of the heat exchange pipe 15 and the battery monomer 1212 in the lower box body 1111 do not need to be considered, thereby simplifying the insulation and corrosion prevention design of the heat exchange pipe 15, reducing the processing difficulty and production cost, solving the short circuit problem of the battery monomer 1212 and the heat exchange pipe 15, improving the reliability of the battery, and moreover, by externally arranging the heat exchange pipe 15 outside the lower box body 1111, the heat exchange pipe 15 does not occupy the space in the lower box body 1111, so that the capacity of the battery will not be reduced due to the installation of the heat exchange pipe 15, and the capacity of the battery is better guaranteed.

[0098] According to some embodiments of the present application, the heat exchange member further comprises a sealing member, which is sealingly fitted between the bottom wall of the lower box body 1111 and the heat exchange pipe 15.

[0099] In the above technical solution, by arranging the sealing member between the bottom wall of the lower box body 1111 and the connecting pipe 16, the risk of overflow of the heat exchange fluid from the fitting position of the current collector 13 and the connecting pipe 16 can be reduced, thereby improving the reliability of the battery. Moreover, the position of the sealing member is clear, so that the assembly of the sealing member is easy, thereby reducing the assembly difficulty and design difficulty.

[0100] Exemplarily, when the connecting pipe 16 is inserted into the heat exchange pipe 15, the sealing member can surround the connecting pipe 16, and the sealing member is located between the outer periphery of the connecting pipe 16 and the bottom wall of the lower box body 1111.

[0101] Exemplarily, the sealing member can be multiple and arranged in the axial direction of the connecting pipe 16. Therefore, by utilizing the axial space of the connecting pipe 16, multiple sealing members are arranged ingeniously, multiple sealing and blocking can be achieved, thereby improving the sealing effect.

[0102] According to some embodiments of the present application, as shown in FIG. 5, in the case that the heat exchange pipe 15 is externally arranged outside the lower box body 1111, the bottom wall of the lower box body 1111 is further provided with a foaming layer 17, and the heat exchange pipe 15 is located between the bottom wall of the lower box body 1111 and the foaming layer 17, so as to protect the heat exchange pipe 15.

[0103] According to some embodiments of the present application, referring to FIG. 4, the lower surface of the expansion beam comprises a first segment 111211, a second segment 111212 and a third segment 111213 connected in sequence, the first segment 111211 forms a first part, and the third segment 111213 is spaced apart from the bottom wall of the lower box body 1111, and the third segment 111213 forms a second part.

[0104] The first section 111211 is connected with the bottom wall of the lower box 1111, and the first section 111211 and the third section 111213 have a height difference, and the second section 111212 is inclined to be connected with the first section 111211 and the third section 111213 respectively.

[0105] The first section 111211 and the second section 111212 can be integrally connected or welded, and the second section 111212 and the third section 111213 can be integrally connected or welded.

[0106] The first section 111211 and the second section 111212 can be an acute angle, a right angle or an obtuse angle, and the first section 111211 and the second section 111212 can be an acute angle, a right angle or an obtuse angle. The specific relative position between the first section 111211 and the third section 111213 can be determined.

[0107] In the embodiment, the first section and the second section at different heights can be connected by the second section 111212, so that the structural strength of the expansion beam can be improved, and the stability of the expansion beam structure can be improved.

[0108] According to some embodiments of the present application, referring to FIGS. 4 and 5, the angles between the second section 111212 and the first section 111211 and the third section 111213 are all obtuse angles, so as to reduce stress concentration and facilitate processing and demolding.

[0109] According to some embodiments of the present application, referring to FIGS. 4 and 5, the expansion beam comprises a first plate 11121 and a second plate 11122 connected with each other, the first plate 11121 is located on the side close to the first accommodating cavity 1114, the second plate 11122 is located on the side close to the second accommodating cavity 1115, and the first plate 11121 has a first section 111211, a second section 111212 and a third section 111213.

[0110] In the embodiment, the first plate 11121 can be connected with the second plate 11122 by integral molding, welding or threaded connection. The first plate 11121 can be connected with the bottom wall of the lower box 1111, or a part of the first plate 11121 can be connected with the bottom wall of the lower box 1111, and the other part can be connected with the second plate 11122.

[0111] In the embodiment, the first plate 11121 close to the battery monomer 12 has a first section 111211, a second section 111212 and a third section 111213, the first section 111211 of the first plate 11121 is connected with the bottom wall of the lower box body 1111, and the third section 111213 of the first plate 11121 can be connected with the upper surface of the current collector 13. By connecting the lower surface of the first plate 11121 close to the battery monomer 12 with the bottom wall of the lower box body 1111, the expansion force of the battery monomer 12 can be constrained by the connecting force between the first plate 11121 and the bottom wall of the lower box body 1111, thereby improving the constraint effect of the expansion beam on the expansion of the battery monomer 12.

[0112] In some embodiments, the first plate 11121 has a concave-convex structure, the region of the first plate 11121 protruding towards the second side abuts against the second plate 11122 to constrain the deformation trend of the first plate 11121 and thereby constrain the expansion of the battery monomer 12, and the region of the first plate 11121 protruding towards the first accommodating cavity 1114 abuts against the battery monomer 12 to absorb the expansion of the battery monomer 12.

[0113] In some embodiments, referring to FIGS. 4 and 5, a part of the second plate 11122, the first section 111211 and the bottom wall of the lower box body 1111 are sequentially connected in layers.

[0114] In the embodiment, a part of the second plate 11122, the first section 111211 and the bottom wall of the lower box body 1111 can be connected by welding or gluing, so as to further increase the connecting strength of the expansion beam and the bottom wall of the lower box body 1111.

[0115] In some embodiments, referring to FIG. 4, the expansion beam is provided with a first through hole communicating with the second accommodating cavity 1115, and a second part of the lower surface of the expansion beam is provided with a second through hole, the second through hole being used for the communication between the water guide pipe 14 and the current collector 13, and the first through hole being used for the extension of the water guide pipe 14 into the second accommodating cavity 1115.

[0116] The second through hole and the water guide pipe 14 and the first through hole and the water guide pipe 14 can be connected by plug-in connection, gluing or welding.

[0117] In the embodiment, as shown in FIG. 7, the thermal management system comprises the header 13, the water guide pipe 14 and a plurality of heat exchange pipes 15, the ends of the plurality of heat exchange pipes 15 are communicated with the header 13, one end of the water guide pipe 14 is communicated with the header 13, and the other end extends into the second accommodating cavity 1115 through the second through hole and the first through hole in sequence. The water guide pipe 14 comprises two, one water guide pipe 14 is used for guiding water into the header 13, and the other water guide pipe 14 is used for guiding water out of the header 13. The plurality of heat exchange pipes 15 comprises two parts, one part of the heat exchange pipes 15 is communicated with the water inlet part of the header 13 for water inlet, and the other part of the heat exchange pipes 15 is communicated with the water return part of the header 13 for water return. The water inlet part of the header 13 and the water return part of the header 13 are isolated by the water inlet and return isolation plate.

[0118] In some embodiments, referring to FIG. 4, the expansion beam comprises a first plate 11121 and a second plate 11122, and a cavity 11123 is formed between the first plate 11121 and the second plate 11122, and a part of the water guide pipe 14 is located in the cavity 11123.

[0119] In the embodiment, the first plate 11121 and the second plate 11122 can have the cavity 11123 therebetween, in the case that the battery monomer 12 expands, the battery monomer 12 exerts an expansion force on the first plate 11121, the first plate 11121 bears the expansion force to have a tendency to deform towards the second plate 11122, and the cavity 11123 left between the first plate 11121 and the second plate 11122 can provide a space for the second plate 11122 to buffer the deformation to absorb the expansion of the battery monomer 12, and meanwhile, the double restraint of the first plate 11121 and the second plate 11122 can further constrain the expansion of the battery monomer 12.

[0120] In some embodiments, referring to FIG. 2, the expansion beam comprises a first expansion beam 1112 and a second expansion beam 1113 arranged at intervals, and a first accommodating cavity 1114 is located between the first expansion beam 1112 and the second expansion beam 1113, and the first expansion beam 1112 and the second expansion beam 1113 each form a mounting cavity 1116 on the side facing the first accommodating cavity 1114.

[0121] In the embodiment, the first expansion beam 1112 and the second expansion beam 1113 are connected with the bottom wall of the lower box body 1111 to constrain the expansion of the battery monomer 12.

[0122] In the embodiment, by arranging the first expansion beam 1112 and the second expansion beam 1113 at the two ends of the battery monomer 12, the deformation of the first expansion beam 1112 and the second expansion beam 1113 can absorb the expansion of the end battery monomer 12, and further improve the restraint of the expansion beam on the expansion of the battery monomer 12.

[0123] According to some embodiments of the present application, the upper surface of the current collector 13 is connected with the second part of the lower surface of the expansion beam, and the lower surface of the current collector 13 is connected with the bottom wall of the lower box 1111.

[0124] In the present embodiment, the first part of the lower surface of the expansion beam is connected with the bottom wall of the lower box 1111, the second part of the lower surface of the expansion beam is connected with the upper surface of the current collector 13, and the lower surface of the current collector 13 is connected with the bottom wall of the lower box 1111, which can further improve the bonding strength of the expansion beam and the lower box 1111.

[0125] In the present embodiment, the first part of the lower surface of the expansion beam is connected with the bottom wall of the lower box 1111, the second part of the lower surface of the expansion beam is connected with the upper surface of the current collector 13, and the lower surface of the current collector 13 is connected with the bottom wall of the lower box 1111, which can further improve the bonding strength of the expansion beam and the lower box 1111.

[0126] According to some embodiments of the present application, a part of the current collector 13 is in the mounting cavity 1116, and another part is in the first containing cavity 1114.

[0127] In the present embodiment, the size of the mounting cavity 1116 along the width direction is smaller than the size of the current collector 13 along the width direction, another part of the current collector 13 protrudes from the mounting cavity 1116 and is located in the first containing cavity 1114, and the plurality of heat exchange pipes 15 can directly communicate with the area of the current collector 13 located in the first containing cavity 1114 without passing through the expansion beam, so that the second part can be completely welded with the upper surface of the current collector 13, further improving the bonding strength of the expansion beam and the bottom wall of the lower box 1111.

[0128] According to the lower box assembly provided by the embodiments of the present application, the lower surface of the expansion beam is divided into a first part and a second part, the current collector 13 is located in the second part and forms a mounting cavity 1116 with the bottom wall of the lower box 1111, and the heat exchange pipes 15 can communicate with the current collector 13 without penetrating through the expansion beam, which can realize complete connection between the first part and the bottom wall of the lower box 1111, thereby improving the bonding strength of the expansion beam and the box; on the other hand, at least part of the current collector 13 is hidden inside the expansion beam, which can reduce the occupation of the effective volume of the battery box by the current collector 13, thereby improving the space utilization rate inside the battery box.

[0129] According to some embodiments of the present application, the present application also provides a box, which comprises the lower box assembly of the battery in any of the above embodiments.

[0130] According to the box provided by the embodiment of the application, the lower surface of the expansion beam is divided into a first part and a second part by the lower box assembly of the battery in any of the above embodiments, the current collector 13 is located in the installation cavity 1116 formed by the second part and the bottom wall of the lower box 1111, and the heat exchange pipe 15 can communicate with the current collector 13 without penetrating the expansion beam. On the one hand, the first part is connected to the bottom wall of the lower box 1111, the second part is connected to the upper surface of the current collector 13, and the lower surface of the current collector 13 is connected to the bottom wall of the lower box 1111, thereby improving the bonding strength of the expansion beam and the box. On the other hand, at least part of the current collector 13 is hidden inside the expansion beam, which can reduce the occupation of the effective volume of the battery box by the current collector 13, thereby improving the space utilization rate inside the battery box.

[0131] According to some embodiments of the application, the application also provides a battery, which comprises a plurality of battery monomers 12, a plurality of heat exchange pipes 15 and the lower box assembly of any of the above solutions, and the plurality of battery monomers 12 are installed in the first containing cavity 1114.

[0132] According to the battery provided by the embodiment of the application, the lower surface of the expansion beam is divided into a first part and a second part by the lower box assembly of the battery in any of the above embodiments, the current collector 13 is located in the installation cavity 1116 formed by the second part and the bottom wall of the lower box 1111, and the heat exchange pipe 15 can communicate with the current collector 13 without penetrating the expansion beam. On the one hand, the first part is connected to the bottom wall of the lower box 1111, the second part is connected to the upper surface of the current collector 13, and the lower surface of the current collector 13 is connected to the bottom wall of the lower box 1111, thereby improving the bonding strength of the expansion beam and the box. On the other hand, at least part of the current collector 13 is hidden inside the expansion beam, which can reduce the occupation of the effective volume of the battery box by the current collector 13, thereby improving the space utilization rate inside the battery box.

[0133] According to some embodiments of the application, the application also provides a power consuming device, which comprises the battery of any of the above solutions, and the battery is used to provide electric energy for the power consuming device.

[0134] The power consuming device can be a device or system using the battery of any of the above applications.

[0135] According to the power consuming device provided by the embodiment of the application, by arranging the battery in any of the above embodiments, the power consumption reliability and endurance of the power consuming device can be improved.

[0136] The above is only a preferred embodiment of the application and is not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A lower box assembly of a battery, characterized in that: include: lower box; an expansion beam mounted in the lower box, wherein a first portion of a lower surface of the expansion beam is connected to a bottom wall of the lower box, and the expansion beam and the lower box form a first accommodating cavity for accommodating a battery cell and a second accommodating cavity for accommodating an electronic device, respectively; wherein a second portion of the lower surface of the expansion beam and the bottom wall of the lower box form a mounting cavity; The heat exchange element comprises a heat exchange tube and a fluid collector connected to the heat exchange tube; wherein, At least part of the current collector is installed in the installation cavity, with the direction perpendicular to the bottom wall as the projection direction and the bottom wall as the projection surface. The projection of the part of the heat exchange tube located outside the current collector on the bottom wall completely falls within the union of the projections of the first accommodating cavity and the installation cavity on the bottom wall.

2. The lower box assembly of the battery according to claim 1, characterized in that: The installation cavity is open toward one side of the first accommodating cavity.

3. The lower box assembly of the battery according to claim 1 or 2, characterized in that: The heat exchange tube is installed on the inner side of the bottom wall, and the projection of the portion of the heat exchange tube located outside the current collector on the bottom wall completely falls within the projection of the first accommodating cavity on the bottom wall.

4. The lower box assembly of the battery according to any one of claims 1 or 2, characterized in that: The heat exchange tube is installed on the outer side of the bottom wall.

5. The lower box assembly of the battery according to claim 4, characterized in that: The heat exchange component further includes a connecting pipe, which passes through the bottom wall and connects the heat exchange pipe and the current collector.

6. The lower box assembly of a battery according to any one of claims 1 to 5, characterized in that: The lower surface of the expansion beam includes a first section, a second section, and a third section connected in sequence, the first section forming the first portion, the third section being spaced apart from the bottom wall of the lower box body, and the third section forming the second portion.

7. The lower box assembly of the battery according to claim 6, characterized in that: The included angles between the second section, the first section and the third section are all obtuse angles.

8. The lower box assembly of the battery according to claim 6, characterized in that: The expansion beam includes a first plate and a second plate connected to each other. The first plate is located on a side close to the first accommodating cavity, the second plate is located on a side close to the second accommodating cavity, and the first plate has the first section, the second section, and the third section.

9. The lower box assembly of the battery according to claim 8, characterized in that: A portion of the second plate is stacked and connected to the first section and the bottom wall of the lower box in sequence.

10. The lower box assembly of a battery according to any one of claims 1 to 9, characterized in that: The expansion beam is provided with a first through hole connected to the second accommodating cavity, and the second part of the lower surface of the expansion beam is provided with a second through hole. The second through hole allows the water pipe to communicate with the collector, and the first through hole allows the water pipe to extend into the second accommodating cavity.

11. The lower box assembly of the battery according to claim 10, characterized in that: The expansion beam includes a first plate and a second plate. A cavity is formed between the first plate and the second plate. A portion of the water conduit is located in the cavity.

12. The lower box assembly of a battery according to any one of claims 1 to 11, characterized in that: The expansion beam includes: a first expansion beam and a second expansion beam spaced apart from each other, the first accommodating cavity is located between the first expansion beam and the second expansion beam, and the first expansion beam and the second expansion beam each have the installation cavity formed on a side facing the first accommodating cavity.

13. The lower box assembly of a battery according to any one of claims 1 to 12, characterized in that: The upper surface of the current collector is connected to the second portion of the lower surface of the expansion beam, and the lower surface of the current collector is connected to the bottom wall of the lower box.

14. The lower box assembly of a battery according to any one of claims 1 to 13, characterized in that: A portion of the current collector is in the installation cavity, and another portion is in the first accommodation cavity.

15. A battery, characterized in that: include: The lower box assembly according to any one of claims 1 to 14; A plurality of battery cells are installed in the first receiving cavity.

16. An electrical device, characterized in that: include: The battery according to claim 15, wherein the battery is used to provide electrical energy to the electrical device.

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