Battery and electric device

Abstract

The utility model discloses a battery and an electric device. Comprising a plurality of single batteries, a battery box, a heat exchange plate and a first connecting piece, the battery box comprises a bottom plate and side plates arranged around the bottom plate, and the bottom plate and the side plates define a containing cavity used for containing a plurality of single batteries. The heat exchange plate is laid on the bottom plate, and the bottom plate and the heat exchange plate are made of different materials. The first connecting piece and one of the bottom plate and the heat exchange plate are made of the same material, the first connecting piece penetrates through the bottom plate and the heat exchange plate in the thickness direction of the bottom plate so as to connect the bottom plate and the heat exchange plate, and the first connecting piece is connected with the one, made of the same material, of the bottom plate and the heat exchange plate through spot welding. By adopting a combined mode of connecting by the connecting piece and welding connection, not only can the structural stability of the heat exchange plate and the bottom plate which are made of dissimilar materials be improved, but also the sealing property of the connecting part can be improved, so that the sealing property of the battery box is improved, and the negative influence on the single batteries caused by external pollutants entering the accommodating cavity is reduced; and the working stability and reliability of the battery are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery and an electrical device. Background Art

[0002] Batteries are widely used in the field of new energy, and electric vehicles have become a new development trend in the automotive industry. As the power source of electric vehicles, batteries are the core components of electric vehicles.

[0003] The sealing of the battery directly affects the working stability of the battery. How to improve the sealing of the battery is an urgent problem to be solved. Utility Model Content

[0004] In view of the above problems, the present application provides a battery and an electrical device to improve the sealing performance of the battery.

[0005] In a first aspect, the present application provides a battery comprising a plurality of battery cells, a battery box, a heat exchange plate and a first connector. The battery box comprises a bottom plate and side plates arranged around the bottom plate, the bottom plate and the side plates enclosing each other to form a receiving cavity for accommodating a plurality of battery cells. The heat exchange plate is laid on the bottom plate, and the bottom plate and the heat exchange plate are made of different materials respectively. The first connector is made of the same material as the bottom plate and one of the heat exchange plates, the first connector passes through the bottom plate and the heat exchange plate in the thickness direction of the bottom plate to connect the bottom plate and the heat exchange plate, and the first connector is connected to the bottom plate and one of the heat exchange plates made of the same material by spot welding.

[0006] The combination of connectors and welding can not only improve the structural stability of the heat exchange plate and the base plate after being connected with each other, but also effectively improve the sealing of the connection, thereby improving the sealing of the battery box, reducing the negative impact of external contaminants entering the accommodating cavity on the battery cells, and improving the working stability and reliability of the battery.

[0007] In some embodiments, the battery box is made of steel and the heat exchange plate is made of aluminum.

[0008] This solution not only improves the structural stability of the battery box but also reduces the overall weight of the battery. Furthermore, the combination of welding and fastening mentioned above also addresses, to a certain extent, the issue of poor sealing when connecting dissimilar steel and aluminum materials. Furthermore, using lighter aluminum for the heat exchange plates increases the overall energy density of the battery.

[0009] In some embodiments, the battery further comprises a limiting beam arranged in the accommodating cavity, the limiting beam comprising a limiting beam body and a limiting beam connecting edge arranged at a bottom end of the limiting beam body and extending outward relative to the limiting beam body, the first connecting piece comprising a limiting beam connecting piece made of the same material as the bottom plate, the limiting beam connecting edge, the heat exchange plate and the bottom plate being stacked in the thickness direction of the bottom plate and connected by the limiting beam connecting piece, and the limiting beam connecting piece and the bottom plate being connected by spot welding.

[0010] The limiting beam, the heat exchange plate and the bottom plate are connected by the limiting beam connecting piece, and since the limiting beam connecting piece is made of the same material as one of the heat exchange plate and the bottom plate, the sealing property at this position can be advantageously improved by continuing to perform spot welding at the position where the limiting beam connecting piece is arranged, thereby improving the working stability and reliability of the battery.

[0011] In some embodiments, the limiting beam connecting edge, the bottom plate and the heat exchange plate are each provided with a connecting hole corresponding in position, the limiting beam connecting piece is arranged in the corresponding connecting holes of the limiting beam connecting edge, the bottom plate and the heat exchange plate, and the limiting beam connecting piece and the connecting hole of the bottom plate are welded.

[0012] The hole wall of the connecting hole of the limiting beam connecting piece and the bottom plate is fully melted and combined by welding to form a welding area, and the welding area is fully filled in the gap in the connecting hole on the bottom plate by this process, thereby realizing reliable and sealed connection of the heat exchange plate and the bottom plate of different materials and reliable fixation of the limiting beam.

[0013] In some embodiments, a beam support is further included, the beam support comprising a first extending portion arranged in abutment with the inner side of the side plate and a second extending portion bent relative to the first extending portion, the first extending portion being connected with the side plate, and the second extending portion being connected with the limiting beam body.

[0014] The bottom of the limiting beam is connected with the bottom plate of the battery box by the limiting beam connecting piece, and the end of the limiting beam in the second direction is connected with the side plate of the battery box by the beam support, in other words, the limiting beam has two connection modes with the battery box, thereby the limiting beam is stably arranged in the accommodating cavity to better play a role in restraining the expansion of the battery monomer.

[0015] In some embodiments, a mounting beam arranged outside the accommodating cavity and a second connecting piece are further included, the mounting beam comprising a mounting beam body and a first mounting beam connecting edge arranged on the mounting beam body, the first mounting beam connecting edge being in abutment with the side plate, the first mounting beam connecting edge, the side plate and the first extending portion being stacked in the thickness direction of the side plate and connected by the second connecting piece, the second connecting piece being made of the same material as the side plate, and the second connecting piece and the side plate being connected by spot welding.

[0016] The second connecting piece can be used to connect the mounting beam, the side plate and the beam support, and the sealing property at the position of the second connecting piece can be improved by spot welding, thereby improving the working stability and reliability of the battery.

[0017] In some embodiments, the first mounting beam connecting edge, the side plate and the first extension are provided with connecting holes corresponding in position, the second connecting piece is arranged in the connecting holes of the first mounting beam connecting edge, the side plate and the first extension, and the second connecting piece is welded with the connecting hole of the side plate.

[0018] The hole wall of the connecting hole of the second connecting piece and the side plate is fully fused and combined to form a welding area, and the welding area is fully filled in the gap in the connecting hole of the side plate by the process, thereby realizing reliable and sealed connection between the mounting beam and the side plate of different materials.

[0019] In some embodiments, the material of the battery box is steel, and the material of the limiting beam is aluminum. In this way, the overall weight of the battery can be reduced, and the overall energy density of the battery can be improved.

[0020] In some embodiments, the mounting beam is further provided, the mounting beam is arranged outside the side plate, the mounting beam comprises a mounting beam body and a second mounting beam connecting edge arranged on the mounting beam body, the second mounting beam connecting edge is arranged on the region of the bottom plate close to the side plate, the first connecting piece comprises a mounting beam connecting piece, the second mounting beam connecting edge, the bottom plate and the heat exchange plate are stacked in the thickness direction of the bottom plate and connected by the mounting beam connecting piece, the mounting beam connecting piece and the bottom plate are made of the same material, and the mounting beam connecting piece and the bottom plate are connected by spot welding.

[0021] The mounting beam, the heat exchange plate and the bottom plate are connected by the mounting beam connecting piece, and since the mounting beam connecting piece is made of the same material as one of the heat exchange plate and the bottom plate, the sealing property at the position of the mounting beam connecting piece can be improved by spot welding, thereby improving the working stability and reliability of the battery.

[0022] In some embodiments, the second mounting beam connecting edge, the bottom plate and the heat exchange plate are provided with connecting holes corresponding in position, the mounting beam connecting piece is arranged in the connecting holes of the second mounting beam connecting edge, the bottom plate and the heat exchange plate, and the mounting beam connecting piece is welded with the connecting hole of the bottom plate.

[0023] The hole wall of the connecting hole of the mounting beam connecting piece and the bottom plate is fully fused and combined to form a welding area, and the welding area is fully filled in the gap in the connecting hole of the bottom plate by the process, thereby realizing reliable and sealed connection between the heat exchange plate and the bottom plate of different materials, and realizing reliable fixation of the mounting beam.

[0024] In some embodiments, the material of the battery box is steel, and the material of the mounting beam is aluminum.

[0025] The use of aluminum material can achieve lightweight design. Moreover, aluminum material has a higher thermal conductivity than steel material, and thus the heat exchange plate can better achieve the transfer of heat in the battery box to the outside through the aluminum mounting, thereby improving the heat dissipation performance of the battery.

[0026] The second aspect of the present application provides a power utilization device, comprising the battery as described above, and the battery is used to provide electric energy.

[0027] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application will be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the drawings.

[0029] Figure 1 is a structural schematic diagram of a vehicle of some embodiments of the present application.

[0030] Figure 2 is a structural schematic diagram of a battery device of some embodiments of the present application.

[0031] Figure 3 is an exploded view of a battery of some embodiments of the present application.

[0032] Figure 4 is a structural schematic diagram of the connection of the limiting beam and the mounting beam on the battery box of some embodiments of the present application.

[0033] Figure 5 is a structural schematic diagram of the connection of the limiting beam and the mounting beam on the battery box of some embodiments of the present application. Figure 4

[0034] Figure 6 is a front view of the battery box of some embodiments of the present application after being connected with the mounting beam.

[0035] Figure 7 is a structural schematic diagram of the connection of the limiting beam and the bottom plate of some embodiments of the present application.

[0036] Figure 8 is a structural schematic diagram of the connection of the limiting beam made of a steel rolling structure and the bottom plate of some embodiments of the present application. ​

[0037] Figure 9 is a schematic view of a structure of connection between the mounting beam and the side plate of some embodiments of the present application.

[0038] Figure 10 is another schematic view of a structure of connection between the mounting beam and the side plate of some embodiments of the present application.

[0039] Figure 11 is a schematic view of a connection state of the beam support of some embodiments of the present application.

[0040] The reference signs are as follows: 10, battery; T, battery module; 1, battery box; 1a, lower box body; 1b, upper box body; 20, vehicle; 11, bottom plate; 12, side plate; 2, heat exchange plate; 3, mounting beam; 31, mounting beam body; 32, first mounting beam connecting edge; 33, second mounting beam connecting edge; 4, limiting beam; 41, limiting beam body; 42, limiting beam connecting edge; 5, beam support; 51, first extension part; 52, second extension part; A1, limiting beam connecting part; A2, mounting beam connecting part; B, second connecting part; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0041] 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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and claims of this application as well as the above discussion of the background of the application, provide examples of the technical features of the application; the terms "comprising," "having," "including," and "containing" as used herein are meant to be open-ended terms that specifically and explicitly include other elements not specifically listed; the term "consisting essentially of, as used herein, means including, but not limited to, the elements specifically listed.

[0042] In the description of embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0043] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.

[0045] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0046] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] At present, from the development of market situation, the application of power battery is more and more widely. The power battery is not only applied to the energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0049] The applicant has found that, in the related art, in order to reduce the manufacturing cost of the battery, the battery box and the heat exchange plate are generally made of different materials. However, when the battery box and the heat exchange plate are made of different materials, the two cannot be directly welded, and therefore a connecting piece, such as a rivet, is generally used for connection. When a rivet is used for connection, a hole needs to be punched on the battery box and the heat exchange plate, and then the rivet is inserted into the hole to connect the heat exchange plate to the battery box. This connection mode causes a certain gap between the hole wall of the hole on the battery box and the circumferential surface of the rivet, resulting in poor sealing performance at the rivet connection position, which may cause external moisture, dust and other pollutants to enter the inside of the battery box through the gap, thereby affecting the working stability and reliability of the battery to some extent.

[0050] Therefore, an embodiment of the present application provides a battery, which includes a heat exchange plate and a bottom plate of a box body made of different materials, and a connecting piece made of the same material as one of the heat exchange plate and the bottom plate. The heat exchange plate and the bottom plate are connected through the connecting piece, and then welding is further performed at the connecting piece, thereby improving the sealing performance and connection stability after the connection of the different materials.

[0051] An embodiment of the present application also provides an electric device including the above battery. The electric device can be a mobile device such as a vehicle, a ship, a small airplane, etc. Taking the vehicle as an example, the vehicle of an embodiment of the present application can be a new energy vehicle. The new energy vehicle can be a pure electric vehicle, or a hybrid vehicle or a range extended vehicle.

[0052] For the convenience of description, an electric device of an embodiment of the present application is taken as a vehicle for description. It is shown in Figure 1 , Figure 1 a vehicle 20 using the battery 10 as a power source. The battery 10 is arranged in the vehicle 20. The vehicle 20 is provided with a driving motor electrically connected to the battery 10, and the battery 10 provides electric energy for the driving motor. The driving motor is connected to the wheels through a transmission mechanism to drive the vehicle to travel. Specifically, the battery 10 can be horizontally arranged at the bottom of the vehicle 20.

[0053] The battery 10 of an embodiment of the present application includes at least one battery module T. Specifically, as shown in Figure 2 the battery 10 of the embodiment includes a battery module M and a battery box 1 for accommodating the battery module T. The battery box 1 has an accommodation cavity, and the battery module T is arranged in the accommodation cavity. In the embodiment shown, Figure 2 the battery box 1 includes a lower box body 1a and an upper box body 1b which are covered with each other. The upper box body 1b and the lower box body 1a jointly define an accommodation space for accommodating the battery module T. Of course, in some other embodiments, the battery 10 can also include a cover body which is covered on the lower box body 1a. The cover body can be, for example, a plate-shaped structure. Of course, the shape of the battery box 1 can be various shapes, such as a cuboid, a cylinder, etc.

[0054] The battery module T includes a plurality of battery cells. The plurality of battery cells can be connected in series, in parallel, or in a mixed connection, where the mixed connection refers to a connection in which both series and parallel connections are present among the plurality of battery cells. The plurality of battery cells can be directly connected in series, in parallel, or in a mixed connection, and the plurality of battery cells can be accommodated in the battery case. Each of the battery cells can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cells can have a cuboid shape, a cylindrical shape, a prismatic shape, or other shapes.

[0055] Reference Figures 3 to 5 Some embodiments of the present application provide a battery including a plurality of battery cells, a battery case 1, a heat exchange plate 2, and a first connecting member. The battery case 1 includes a bottom plate 11 and side plates 12 disposed around the bottom plate 11. The bottom plate 11 and the side plates 12 enclose a receiving cavity for accommodating the plurality of battery cells. The heat exchange plate 2 is laid on the bottom plate 11. The bottom plate 11 and the heat exchange plate 2 are respectively made of different materials. The first connecting member is made of the same material as one of the bottom plate 11 and the heat exchange plate 2, and the first connecting member penetrates the bottom plate 11 and the heat exchange plate 2 in the thickness direction of the bottom plate 11 to connect the bottom plate 11 and the heat exchange plate 2, and the first connecting member and the one of the bottom plate 11 and the heat exchange plate 2 made of the same material are connected by spot welding.

[0056] Specifically, the bottom plate 11 has a substantially rectangular structure, and the length direction of the bottom plate 11 is a first direction X, and the width direction of the bottom plate 11 is a second direction Y. The first direction X is perpendicular to the second direction Y. The side plates 12 include two first side plates extending along the first direction X and two second side plates extending along the second direction Y. The two first side plates are spaced apart in the second direction Y and are respectively arranged on two long sides of the bottom plate 11, and the two second side plates are spaced apart in the first direction X and are respectively arranged on two short sides of the bottom plate 11. The bottom plate 11, the two first side plates, and the two second side plates collectively enclose a receiving cavity that is open on one side. A side of the bottom plate 11 facing the receiving cavity is referred to as an inner side, and correspondingly, a side of the bottom plate 11 facing away from the receiving cavity is referred to as an outer side. The heat exchange plate 2 is laid on the inner side of the bottom plate 11.

[0057] The first connecting member is, for example, a mechanical fastener, and more specifically, for example, a rivet. In this case, connecting holes are provided at corresponding positions of the bottom plate 11 and the heat exchange plate 2, and then the heat exchange plate 2 is fastened and connected with the bottom plate 11 by the mechanical fastener. When the first connecting member and the heat exchange plate 2 are made of the same material, a welding zone is formed in the hole wall of the connecting hole on the heat exchange plate 2 by spot welding at the first connecting member, so as to better fill the gap existing in the connecting hole on the heat exchange plate 2, and the welding zone formed by the first connecting member and the connecting hole of the heat exchange plate 2 can to some extent shield and close the gap in the connecting hole on the bottom plate 11, thus improving the sealing of the containing cavity. Alternatively, when the first connecting member and the bottom plate 11 are made of the same material, a welding zone can be formed in the hole wall of the connecting hole on the bottom plate 11 by welding, so as to better fill the gap in the connecting hole on the bottom plate 11 and better seal the containing cavity.

[0058] In summary, the combination of the connecting member connection and the welding connection can not only improve the structural stability of the heat exchange plate and the bottom plate made of different materials after being connected, but also effectively improve the sealing of the connection, so as to improve the sealing of the battery box 1, reduce the negative impact of external pollutants entering the containing cavity on the battery monomer, and improve the working stability and reliability of the battery.

[0059] In some embodiments, the material of the battery box 1 is steel, and the material of the heat exchange plate 2 is aluminum.

[0060] Specifically, the bottom plate 11 and the side plate 12 are made of steel, and the heat exchange plate 2 is made of aluminum. By using this scheme, the strength of the steel itself can be used to improve the structural stability of the battery box 1, and the lightweight characteristic of the aluminum itself can be used to realize the lightweight of the whole battery. Moreover, based on the combination of welding and fastening connection described above, the poor sealing problem of the connection of steel and aluminum dissimilar materials is also solved to some extent. In addition, the heat exchange plate 2 is made of lighter aluminum, which can improve the energy density of the whole battery.

[0061] In order to improve the sealing of the battery box 1, in some embodiments, the battery box 1 is manufactured by a stamping forming process. In this embodiment, the bottom plate 11 and the side plate 12 are of an integrated structure, which strengthens the sealing of the joint of the bottom plate 11 and the side plate 12 compared with a split structure.

[0062] Reference Figure 7In some embodiments, the battery further comprises a limiting beam 4. The limiting beam 4 is arranged in the accommodating cavity. The limiting beam 4 comprises a limiting beam body 41 and a limiting beam connecting edge 42 arranged at the bottom end of the limiting beam body 41 and extending outward relative to the limiting beam body 41, the first connecting member comprises a limiting beam connecting member A1, the limiting beam connecting member A1 is made of the same material as the bottom plate 11, the limiting beam connecting edge 42, the heat exchange plate 2 and the bottom plate 11 are stacked in the thickness direction of the bottom plate 11 and connected by the limiting beam connecting member A1, and the limiting beam connecting member A1 and the bottom plate 11 are connected by spot welding.

[0063] The length direction of the limiting beam body 41 is generally parallel to and abuts the large face of the battery monomer, which is a key component for absorbing the expansion force of the battery monomer and ensuring the stability of the battery structure. Specifically, the limiting beam body 41 has a cavity inside, and the cross section of the limiting beam body 41 is generally in the shape of a "day" character. When the battery monomer has an expansion trend, the limiting beam body 41 can deform to absorb the expansion force by using the cavity inside itself. The limiting beam connecting edge 42 is used to mount the limiting beam connecting member A1. The limiting beam body 41 extends along the second direction Y, and the size of the limiting beam body 41 in the second direction Y is substantially equal to the size of the bottom plate 11 in the second direction Y, so that the two ends of the limiting beam body 41 in the second direction Y are respectively connected with the inner side surfaces of the two first side plates. Thus, the battery box 1 and the limiting beam 4 form a frame structure, which improves the overall structural strength of the battery. The limiting beam body 41 protrudes from the surface of the heat exchange plate 2 along the height direction of the battery box 1, or along the thickness direction of the heat exchange plate 2 towards the open end of the accommodating cavity. The limiting beam body 41 has a certain height to better contact the large face of the battery monomer. The bottom surface of the limiting beam body 41 is generally planar to stably fit with the heat exchange plate 2, which improves the positional stability of the limiting beam 4. The limiting beam connecting edge 42 extends from the bottom of the limiting beam body 41 in the first direction X towards the second side plate relative to the limiting beam body 41 by a certain length to realize the connection with the bottom plate 11. Specifically, the limiting beam connecting edge 42 and the bottom plate 11 are connected by the limiting beam connecting member A1.

[0064] In this embodiment, the provision of a limiting beam can provide a certain buffering effect on battery expansion, thereby improving the positional stability of the battery cell in the accommodating cavity. Furthermore, the limiting beam connector A1 can connect the limiting beam 4, the heat exchange plate 2, and the bottom plate 11. Since the limiting beam connector A1 is made of the same material as the bottom plate 11, spot welding can be performed at the location where the limiting beam connector A1 is provided. This weld zone is formed between the limiting beam connector A1 and the bottom plate 11 at the location where the limiting beam connector A1 is connected. This weld zone further improves the sealing of the connection and enhances the stability of the limiting beam connector A1 after connection with the bottom plate 11. On the basis of the improved connection stability between the limiting beam connector A1 and the bottom plate 11, the positional stability of the limiting beam 4 is also improved, further improving the positional stability of the battery cell, thereby improving the operating stability and reliability of the battery.

[0065] It is worth noting that the spot welding here refers to the stacking of the three-layer components of the limiting beam connecting edge 42, the heat exchange plate 2 and the bottom plate 11, and the welding is achieved by applying the spot welding device to the limiting beam connecting part A1. The spot welding described in the rest of this article should also be understood in reference to this.

[0066] In some embodiments, the limiting beam connecting edge 42, the bottom plate 11 and the heat exchange plate 2 are all provided with corresponding connection holes, and the limiting beam connecting member A1 is passed through the corresponding connection holes of the limiting beam connecting edge 42, the bottom plate 11 and the heat exchange plate 2, and the limiting beam connecting member A1 is welded to the connection hole of the bottom plate 11.

[0067] Specifically, the limiting beam connector A1 and the bottom plate 11 are both made of steel, for example. During connection, the limiting beam connector A1 is sequentially passed through the limiting beam connecting edge 42, the bottom plate 11, and the connection holes of the heat exchange plate 2, thereby forming a tight connection between the limiting beam connecting edge 42, the bottom plate 11, and the heat exchange plate 2. Then, the two electrodes of the spot welding device are respectively applied to the two ends of the limiting beam connector A1, and the hole wall of the connecting hole of the limiting beam connector A1 and the bottom plate 11 are fully melted and combined through welding to form a welding area. This process is used to make the welding area fully fill the gap in the connecting hole on the bottom plate 11. In other words, the hole wall of the connecting hole on the bottom plate 11 and the peripheral wall of the limiting beam connector A1 are connected as one under the action of spot welding, thereby eliminating the gap at the connection between the limiting beam connector A1 and the connecting hole as much as possible. In this way, a reliable and sealed connection of dissimilar materials between the heat exchange plate 2 and the bottom plate 11 is achieved, and a reliable fixation of the limiting beam 4 is achieved. Especially when the limiting beam 4 and the bottom plate 11 are also made of dissimilar materials, with the help of the solution of this embodiment, a reliable and sealed connection of dissimilar materials between the limiting beam 4 and the bottom plate 11 can also be achieved.

[0068] It is worth mentioning that when the limiting beam connecting piece A1 is welded with the bottom plate 11, there is no welding relationship between the heat exchange plate 2 and the bottom plate 11, and there is also no welding relationship between the limiting beam connecting piece A1 and the heat exchange plate 2. Similarly, if the limiting beam 4 is made of aluminum material, the limiting beam 4 also has no welding relationship with the limiting beam connecting piece A1. At this time, for the limiting beam 4 and the heat exchange plate 2, the limiting beam connecting piece A1 only plays a role of fastening and connecting the two with the bottom plate 11, and the limiting beam connecting piece A1 only has a welding relationship with the bottom plate 11. And when spot welding, appropriate welding parameters (welding current, welding time, etc.) should be used to make the circumferential surface of the limiting beam connecting piece A1 and the hole wall of the connecting hole on the bottom plate 11 fully melt and combine in the whole circumferential direction, thereby forming a welding area in the whole circumferential direction. The welding area will also cover the gap of the connecting hole on the heat exchange plate 2 to some extent, thereby further improving the sealing performance of the battery box.

[0069] In some embodiments, the limiting beam connecting piece A1 is a rivet. In this way, the cost can be reduced.

[0070] In some embodiments, the limiting beam 4 is made of aluminum. In this way, the overall weight of the battery can be reduced, and the overall energy density of the battery can be improved.

[0071] In some embodiments, the number of limiting beams 4 is multiple, and the multiple limiting beams 4 are arranged at intervals in the first direction X. Some of the multiple limiting beams 4 are aluminum extruded structure beams, and the rest are steel rolled structure beams. For the steel rolled structure beam, refer to Figure 8 The limiting beam connecting piece A1 is directly connected with the bottom plate 11 through the bottom surface of the steel rolled structure beam.

[0072] Refer to Figure 11 In some embodiments, the battery further comprises a beam support 5 arranged on the inner side of the side plate 12. The beam support 5 comprises a first extension 51 arranged on the inner side of the side plate 12 and a second extension 52 bent relative to the first extension 51, and the first extension 51 is connected with the side plate 12, and the second extension 52 is connected with the limiting beam body 41.

[0073] Specifically, the beam support 5 is arranged on the inner side of the first side plate, and the beam support 5 is a sheet-shaped bent member, that is, the first extension 51 and the second extension 52 are both sheet structures, the first extension 51 is arranged on the inner side surface of the first side plate, and the second extension 52 extends a certain distance in the second direction Y relative to the first extension 51 and is attached to the part of the limiting beam body 41 close to the first side plate. The limiting beam body 41 has a pair of opposite surfaces arranged in parallel in the first direction X, and the two opposite surfaces respectively face two second side plates. The second extension 52 is attached to and connected with one of the two opposite surfaces of the limiting beam body 41.

[0074] The bottom of the limiting beam 4 is connected with the bottom plate 11 of the battery box 1 through a limiting beam connector A1, and the end of the limiting beam 4 in the second direction Y is connected with the side plate 12 of the battery box 1 through a beam support 5, in other words, the limiting beam 4 and the battery box 1 have two connection modes, so that the limiting beam 4 is stably arranged in the accommodation cavity to better play a restraining role on the expansion of the battery monomer.

[0075] In some embodiments, the second extension 52 and the surface of the limiting beam body 41 are connected by brazing.

[0076] Specifically, a certain gap is provided between the second extension 52 and the surface of the limiting beam body 41 to place the filler in the gap, and then the filler is melted by heating and sufficiently fills the gap, thereby realizing the connection between the second extension 52 and the limiting beam body 41.

[0077] Based on this scheme, the connection structure between the second extension 52 and the limiting beam body 41 can be simplified, and the second extension 52 is tightly attached to the limiting beam body 41 to reduce the space occupation in the accommodation cavity.

[0078] In some embodiments, the beam support 5 is made of aluminum material to further realize the lightweight design of the battery.

[0079] Reference Figure 10 In some embodiments, the battery further comprises a mounting beam 3 and a second connector B arranged outside the accommodation cavity. The mounting beam 3 comprises a first mounting beam connecting edge 32 arranged on the mounting beam body 31. The first mounting beam connecting edge 32 is attached to the side plate 12. The first mounting beam connecting edge 32, the side plate 12 and the first extension 51 are stacked in the thickness direction of the side plate 12 and connected by the second connector B, the second connector B and the side plate 12 are made of the same material, and the second connector B and the side plate 12 are connected by spot welding.

[0080] The mounting beam 3 is arranged outside the first side plate, the mounting beam body 31 extends in the second direction Y relative to the first side plate, the first mounting beam connecting edge 32 extends towards the top of the accommodation cavity relative to the mounting beam body 31, and the second connector B sequentially passes through the first mounting beam connecting edge 32, the side plate 12 and the first extension 51 of the beam support 5, and tightly connects the three.

[0081] In the embodiment, the mounting beam 3, the first side plate and the beam support 5 can be connected through the second connecting piece B, and by continuing to spot weld at the arranged position of the second connecting piece B, the second connecting piece B can form a welding area with the first side plate at the position connected with the first side plate. The welding area can be used to further improve the sealing of the connection, thereby improving the working stability and reliability of the battery. Further, the welding area can be used to improve the stability of the second connecting piece B after being connected with the first side plate. On the basis of improving the connection stability between the second connecting piece B and the first side plate, the position stability of the mounting beam 3 is also improved, which helps to improve the stability of the battery mounted on the vehicle chassis.

[0082] In some embodiments, the first mounting beam connecting edge 32, the side plate 12 and the first extension 51 are all provided with a corresponding connecting hole, the second connecting piece B is arranged in the connecting holes of the first mounting beam connecting edge 32, the side plate 12 and the first extension 51, the second connecting piece B is made of the same material as the side plate 12, and the second connecting piece B forms a welding area at least in the connecting hole of the side plate 12.

[0083] Specifically, the second connecting piece B and the first side plate are both made of steel material, for example. When connected, the second connecting piece B is sequentially arranged through the first mounting beam connecting edge 32, the first side plate and the first extension 51. At this time, the first mounting beam connecting edge 32, the first side plate and the first extension 51 are tightly connected. Then, the two electrodes of the spot welding device are respectively applied to the two ends of the second connecting piece B, so that the hole wall of the connecting hole of the first side plate and the peripheral wall of the second connecting piece B are sufficiently melted and combined to form a welding area. In this way, the welding area can sufficiently fill the gap in the connecting hole of the first side plate. In other words, the hole wall of the connecting hole of the first side plate and the peripheral wall of the second connecting piece B are integrally connected under the action of spot welding, so that the gap between the second connecting piece B and the connecting hole is eliminated as much as possible by the welding area. In this way, reliable and sealed connection between the mounting beam 3 and the first side plate is achieved. Especially when the mounting beam 3 and the first side plate are made of different materials, the second connecting piece B and the hole wall of the first side plate can form a welding area by the scheme of the embodiment, which can better fill the gap in the connecting hole of the first side plate and form a closed and covered connection hole on the first mounting beam connecting edge 32, thereby achieving reliable and sealed connection between the mounting beam 3 and the first side plate made of different materials.

[0084] Moreover, the beam support 5 bent in the way can also establish a connection relationship between the limiting beam 4 and the mounting beam 3, which can further improve the correlation between the parts in the battery, thereby improving the overall structural strength of the battery.

[0085] Reference Figure 6 , 9And 10, in some embodiments, the mounting beam 3 further comprises a mounting beam body 31 and a second mounting beam connecting edge 33 arranged on the mounting beam body 31, and the second mounting beam connecting edge 33 is arranged to fit the area of the bottom plate 11 close to the side plate 12. The first connecting piece comprises a mounting beam connecting piece A2. The second mounting beam connecting edge 33, the bottom plate 11 and the heat exchange plate 2 are stacked in the thickness direction of the bottom plate 11 and connected by the mounting beam connecting piece A2. The mounting beam connecting piece A2 is made of the same material as the bottom plate 11. The mounting beam connecting piece A2 and the bottom plate 11 are connected by spot welding.

[0086] Specifically, the second mounting beam connecting edge 33 extends in the second direction Y towards the inside of the accommodating cavity relative to the mounting beam body 31, the second mounting beam connecting edge 33 coincides with the part of the heat exchange plate 2 close to the first side plate in the second direction Y, and the mounting beam connecting piece A2 sequentially penetrates the second mounting beam connecting edge 33, the bottom plate 11 and the heat exchange plate 2, and tightly connects the three. And the mounting beam body 31 comprises a mounting surface for fitting the outer side surface of the first side plate, the first mounting beam connecting edge 32 is arranged at the top of the mounting surface in the height direction and extends in the same plane as the mounting surface, and the second mounting beam connecting edge 33 is arranged at the bottom of the mounting surface in the height direction and is at an angle with the mounting surface. The first mounting beam connecting edge 32, the mounting surface and the second mounting beam connecting edge 33 form an L-shaped structure which covers the outer side of the connection between the bottom plate 11 and the first side plate. Through this scheme, the mounting beam 3 is connected with the battery box 1 at both the bottom of the battery box 1 and the side of the battery box 1, improving the stability of the mounting beam 3.

[0087] In this embodiment, the mounting beam 3, the heat exchange plate 2 and the bottom plate 11 are connected by the mounting beam connecting piece A2. Since the mounting beam connecting piece A2 is made of the same material as the bottom plate 11, by continuing to spot weld at the position where the mounting beam connecting piece A2 is arranged, a welding area can be formed between the mounting beam connecting piece A2 and the bottom plate 11 at the position where they are connected. The welding area is used to further improve the sealing of the connection, which can advantageously improve the sealing of this place, thereby improving the working stability and reliability of the battery. Further, the welding area can improve the stability of the connection between the mounting beam connecting piece A2 and the bottom plate 11, and on the basis of the improved stability of the connection between the mounting beam connecting piece A2 and the bottom plate 11, the position stability of the mounting beam 3 is also improved, which helps to improve the stability of the battery mounted on the vehicle chassis.

[0088] In some embodiments, the second mounting beam connecting edge 33, the bottom plate 11 and the heat exchange plate 2 are all provided with connecting holes corresponding in position, the mounting beam connecting piece A2 is arranged to penetrate the connecting holes of the second mounting beam connecting edge 33, the bottom plate 11 and the heat exchange plate 2, and the connecting holes of the mounting beam connecting piece A2 and the bottom plate 11 are welded.

[0089] Specifically, the mounting beam connecting piece A2 and the bottom plate 11 are both made of steel material. When connected, the mounting beam connecting piece A2 is sequentially inserted through the second mounting beam connecting edge 33, the bottom plate 11 and the connecting hole of the heat exchange plate 2, at this time, the second mounting beam connecting edge 33, the bottom plate 11 and the heat exchange plate 2 are tightly connected. Then, the two electrodes of the spot welding device are respectively applied to the two ends of the mounting beam connecting piece A2, so that the mounting beam connecting piece A2 and the hole wall of the connecting hole of the bottom plate 11 are fully fused and combined to form a welding area. This process is used to fill the gap in the connecting hole of the bottom plate 11 with the welding area. In other words, the hole wall of the connecting hole of the bottom plate 11 and the peripheral wall of the mounting beam connecting piece A2 are connected as a whole under the action of spot welding, so that the gap at the connecting position of the mounting beam connecting piece A2 and the connecting hole is eliminated as much as possible by the welding area. Thus, the reliable and sealed connection of the heat exchange plate 2 and the bottom plate 11 made of different materials is achieved, and the reliable fixation of the mounting beam 3 is achieved. Especially when the mounting beam 3 and the bottom plate 11 are made of different materials, by means of the scheme of the embodiment, the mounting beam connecting piece A2 and the hole wall of the bottom plate form a welding area, which better fills the gap in the connecting hole of the bottom plate and forms a seal and cover for the connecting hole on the second mounting beam connecting edge 33, thereby achieving the reliable and sealed connection between the mounting beam 3 and the bottom plate 11 made of different materials.

[0090] It is worth noting that when the mounting beam connecting piece A2 and the bottom plate 11 are welded together, there is no welding relationship between the heat exchange plate 2 and the bottom plate 11, and there is also no welding relationship between the mounting beam connecting piece A2 and the heat exchange plate 2. Similarly, if the mounting beam 3 is made of aluminum material, there is also no welding relationship between the mounting beam 3 and the mounting beam connecting piece A2. At this time, for the mounting beam 3 and the heat exchange plate 2, the mounting beam connecting piece A2 only serves to tightly connect them with the bottom plate 11, and the mounting beam connecting piece A2 only has a welding relationship with the bottom plate 11. And when spot welding, appropriate welding parameters (welding current, welding time, etc.) should be used to make the peripheral surface of the mounting beam connecting piece A2 and the hole wall of the connecting hole on the bottom plate 11 fully melt and combine in the entire periphery, thereby forming a welding area in the entire periphery. The welding area also covers the gap of the connecting hole on the heat exchange plate 2 and the gap of the connecting hole on the second mounting beam connecting edge 33 to some extent, thereby further improving the sealing performance of the battery box 1.

[0091] In some embodiments, the mounting beam connecting piece A2 is a rivet. The use of a rivet can effectively reduce the production cost.

[0092] In some embodiments, the mounting beam 3 is made of aluminum material. The use of aluminum material can achieve lightweight design. Moreover, aluminum material has a higher thermal conductivity than steel material, so that the heat exchange plate can better achieve the transfer of heat in the battery box 1 to the outside through the aluminum mounting, thereby improving the heat dissipation performance of the battery.

[0093] In some embodiments, the mounting beam 3 comprises an aluminum profile extruded structure beam.

[0094] In some embodiments, the second connecting member B comprises a rivet to reduce cost.

[0095] Some embodiments of the present application also provide a power consuming device comprising the battery as described above, the battery being configured to provide electric power.

[0096] The structure and mounting process of the battery of one specific embodiment of the present application will be described in detail below with reference to the accompanying drawings. Figures 3 to 11

[0097] Firstly, referring to Figure 3 , the battery comprises a battery box 1, a heat exchange plate 2, a mounting beam 3, a limiting beam 4, a beam support 5 and a plurality of battery cells. The battery box 1 is made of steel material, the heat exchange plate 2, the mounting beam 3, the limiting beam 4 and the beam support 5 are all made of aluminum material.

[0098] In combination with Figure 3 and further referring to Figures 4 to 6 , the battery box 1 is made by a stamping forming process, which comprises a bottom plate 11 and side plates 12 arranged around the edges of the bottom plate 11. The side plates 12 comprise two first side plates and two second side plates, the first side plates extend along a first direction X, and the second side plates extend along a second direction Y. The first direction X is the length direction of the battery box 1, and the second direction Y is the width direction of the battery box 1. The bottom plate 11 and the side plates 12 jointly form a bottom-closed and top-open accommodating cavity. The accommodating cavity is configured to accommodate the plurality of battery cells. The heat exchange plate 2 is laid on the inner surface of the bottom plate 11.

[0099] Referring to Figure 3 , 7 ​And 8, the number of limiting beams 4 includes three, three limiting beams 4 are arranged at intervals in the first direction X. The limiting beam 4 is arranged in the accommodating cavity and connected to the surface of the heat exchange plate 2, the limiting beam 4 extends along the second direction Y, and the two ends of the limiting beam 4 in the second direction Y are connected with the first side plate through the beam support 5. The three limiting beams 4 include edge limiting beams arranged near the two second side plates and a middle limiting beam located between the two edge limiting beams in the first direction X. The edge limiting beam is an aluminum profile extruded structure beam, and the middle limiting beam is a steel roller pressed structure beam. The edge limiting beam includes a limiting beam main body 41 and a limiting beam connecting edge 42 extending towards the second side plate along the first direction X at the bottom of the limiting beam main body 41. The limiting beam connecting edge 42, the heat exchange plate 2, and the bottom plate 11 are stacked in the thickness direction of the bottom plate 11 in sequence, and a connecting hole corresponding in position is formed on the limiting beam connecting edge 42, the heat exchange plate 2, and the bottom plate 11. The limiting beam connecting piece A1 (steel rivet) passes through the connecting holes on the limiting beam connecting edge 42, the heat exchange plate 2, and the bottom plate 11, and the two ends of the limiting beam connecting piece A1 are also connected with the two electrodes of the spot welding device to realize spot welding, so that the limiting beam connecting piece A1 and the hole wall of the connecting hole of the bottom plate 11 are fully melted and combined to form a welding area. The welding area fills the gap between the circumferential surface of the limiting beam connecting piece A1 and the hole wall of the connecting hole of the bottom plate 11, and covers the gap between the circumferential surface of the limiting beam connecting piece A1 and the hole wall of the connecting hole of the heat exchange plate 2, and the gap between the circumferential surface of the limiting beam connecting piece A1 and the hole wall of the connecting hole of the limiting beam connecting edge 42, thereby improving the sealing performance of the battery box. The middle limiting beam is connected with the bottom plate 11 and the heat exchange plate 2 at the bottom through the limiting beam connecting piece A1, and three-layer spot welding is performed here. Since the middle limiting beam, the bottom plate 11, and the limiting beam connecting piece A1 are all made of steel, the hole wall of the connecting hole on the limiting beam connecting edge 42 of the middle limiting beam, the connecting hole on the bottom plate 11, and the limiting beam connecting piece A1 all form a welding area. In this way, the heat exchange plate 2 is clamped between the upper and lower two welding areas, further improving the sealing performance and connection stability at this position.

[0100] Reference Figure 3 , 9 And 11, the number of mounting beams 3 includes two, two mounting beams 3 are arranged outside the two first side plates respectively. The mounting beam 3 extends along the first direction X. The mounting beam 3 includes a mounting beam main body 31, a first mounting beam connecting edge 32, and a second mounting beam connecting edge 33.

[0101] The mounting beam body 31 includes a mounting surface for abutting the outer side of the first side plate, and the surface profile of the mounting surface is matched with the outer side of the first side plate to better abut the first side plate. The first mounting beam connecting edge 32 extends from the top of the mounting surface towards the opening end of the accommodating cavity, and the beam bracket 5 includes a first extending portion 51 and a second extending portion 52, the first extending portion 51 is arranged on the inner side of the first side plate and abuts the inner surface of the first side plate, and the second extending portion 52 extends in the second direction Y relative to the first extending portion 51, the second extending portion 52 forms an L-shaped bending member with the first extending portion 51, and the second extending portion 52 is connected with the limiting beam body 41 by brazing. The first mounting beam connecting edge 32, the first side plate, and the first extending portion 51 are sequentially stacked in the second direction Y, and the first mounting beam connecting edge 32, the first side plate, and the first extending portion 51 are all provided with connecting holes, the second connecting piece B (steel rivet) sequentially passes through the connecting holes of the first mounting beam connecting edge 32, the first side plate, and the first extending portion 51, and the two ends of the second connecting piece B also pass through the two electrodes of the connecting spot welding device to realize spot welding, so that the second connecting piece B is fully melted and combined with the hole walls of the connecting holes of the first side plate to form a welding area, the gap between the hole walls of the connecting holes of the first side plate and the circumferential surface of the second connecting piece B is filled by the welding area, and the gap between the hole walls of the connecting holes of the first mounting beam connecting edge 32 and the circumferential surface of the second connecting piece B and the gap between the hole walls of the connecting holes of the first extending portion 51 and the circumferential surface of the second connecting piece B are also covered, thereby improving the sealing performance of the battery box.

[0102] The second mounting beam connecting edge 33 extends from the bottom of the mounting surface towards the accommodating cavity in the second direction Y, and the second mounting beam connecting edge 33 overlaps with the area of the bottom plate 11 close to the first side plate, the second mounting beam connecting edge 33, the bottom plate 11, and the heat exchange plate 2 are sequentially stacked, and the second mounting beam connecting edge 33, the bottom plate 11, and the heat exchange plate 2 are all provided with position corresponding connecting holes, the mounting beam connecting piece A2 (steel rivet) sequentially passes through the connecting holes of the second mounting beam connecting edge 33, the bottom plate 11, and the heat exchange plate 2, and the two ends of the mounting beam connecting piece A2 also pass through the two electrodes of the connecting spot welding device to realize spot welding, so that the mounting beam connecting piece A2 is fully melted and combined with the hole walls of the connecting holes of the bottom plate 11 to form a welding area, the gap between the hole walls of the connecting holes of the bottom plate 11 and the circumferential surface of the mounting beam connecting piece A2 is filled by the welding area, and the gap between the hole walls of the connecting holes of the heat exchange plate 2 and the circumferential surface of the mounting beam connecting piece A2 and the gap between the hole walls of the connecting holes of the second mounting beam connecting edge 33 and the circumferential surface of the mounting beam connecting piece A2 are also covered, thereby improving the sealing performance of the battery box.

[0103] For the middle limiting beam, the two opposite surfaces of each end of the limiting beam body 41 in the first direction X are connected with the first side plate through the beam support 5, that is, the middle limiting beam is connected with the battery box 1 through four beam supports 5; for the edge limiting beam, only one side of each end of the limiting beam body 41 in the second direction Y facing the second side plate is provided with the beam support 5.

[0104] Before spot welding, the surface of the bottom plate 11, the side plate 12, the heat exchange plate 2, the mounting beam 3, the limiting beam 4 and the beam support 5 needs to be pretreated, for example, removing oil stains, oxide film and rust on the surface, so as to reduce the adverse effects on the welding process. And before spot welding, the rivets need to be installed and fixed first, and then welded.

[0105] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application and equivalent components can be substituted for those therein. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that: include: Multiple battery cells; A battery box (1) comprises a bottom plate (11) and side plates (12) arranged around the bottom plate (11), wherein the bottom plate (11) and the side plates (12) enclose a receiving cavity for receiving the plurality of battery cells; A heat exchange plate (2) is laid on the base plate (11), wherein the base plate (11) and the heat exchange plate (2) are made of different materials; and A first connecting member is made of the same material as the base plate (11) and one of the heat exchange plates (2); the first connecting member passes through the base plate (11) and the heat exchange plate (2) in the thickness direction of the base plate (11) to connect the base plate (11) and the heat exchange plate (2); and the first connecting member is connected to the base plate (11) and one of the heat exchange plates (2) made of the same material by spot welding.

2. The battery according to claim 1, characterized in that The material of the battery box (1) is steel, and the material of the heat exchange plate (2) is aluminum.

3. The battery according to claim 1, characterized in that The heat exchange plate (2) and the bottom plate (11) are stacked in the thickness direction of the bottom plate (11) and connected by the limit beam connecting member (A1), and the limit beam connecting member (A1) and the bottom plate (11) are connected by the limit beam connecting member (A1), and the limit beam connecting member (A1) and the bottom plate (11) are connected by spot welding.

4. The battery according to claim 3, characterized in that The limiting beam connecting edge (42), the bottom plate (11) and the heat exchange plate (2) are all provided with corresponding connecting holes, the limiting beam connecting member (A1) is passed through the corresponding connecting holes of the limiting beam connecting edge (42), the bottom plate (11) and the heat exchange plate (2), and the limiting beam connecting member (A1) is welded to the connecting holes of the bottom plate (11).

5. The battery according to claim 3, characterized in that The invention also includes a beam support (5), wherein the beam support (5) includes a first extension portion (51) arranged on the inner side of the side plate (12) and a second extension portion (52) bent relative to the first extension portion (51), the first extension portion (51) being connected to the side plate (12), and the second extension portion (52) being connected to the limiting beam body (41).

6. The battery according to claim 5, characterized in that The invention also includes a mounting beam (3) and a second connecting member (B) arranged on the outside of the accommodating cavity, wherein the mounting beam (3) includes a mounting beam body (31) and a first mounting beam connecting edge (32) arranged on the mounting beam body (31), the first mounting beam connecting edge (32) is fitted with the side plate (12), the first mounting beam connecting edge (32), the side plate (12) and the first extension portion (51) are stacked in the thickness direction of the side plate (12) and connected by the second connecting member (B), the second connecting member (B) and the side plate (12) are made of the same material, and the second connecting member (B) and the side plate (12) are connected by spot welding.

7. The battery according to claim 6, characterized in that The first mounting beam connecting edge (32), the side plate (12) and the first extension portion (51) are all provided with connecting holes at corresponding positions; the second connecting member (B) is passed through the connecting holes of the first mounting beam connecting edge (32), the side plate (12) and the first extension portion (51), and the second connecting member (B) is welded to the connecting hole of the side plate (12).

8. The battery according to any one of claims 3 to 7, characterized in that The material of the battery box (1) is steel, and the material of the limiting beam (4) is aluminum.

9. The battery according to claim 1, characterized in that The heat exchange plate (2) further comprises a mounting beam (3), wherein the mounting beam (3) is arranged on the outer side of the side plate (12), the mounting beam (3) comprises a mounting beam body (31) and a second mounting beam connecting edge (33) arranged on the mounting beam body (31), and the second mounting beam connecting edge (33) is arranged in a region of the bottom plate (11) close to the side plate (12), the first connecting member comprises a mounting beam connecting member (A2), the second mounting beam connecting edge (33), the bottom plate (11) and the heat exchange plate (2) are stacked in the thickness direction of the bottom plate (11) and connected by the mounting beam connecting member (A2), the mounting beam connecting member (A2) and the bottom plate (11) are made of the same material, and the mounting beam connecting member (A2) and the bottom plate (11) are connected by spot welding.

10. The battery according to claim 9, characterized in that The second mounting beam connecting edge (33), the bottom plate (11) and the heat exchange plate (2) are all provided with corresponding connection holes, the mounting beam connecting member (A2) is passed through the connection holes of the second mounting beam connecting edge (33), the bottom plate (11) and the heat exchange plate (2), and the mounting beam connecting member (A2) is welded to the connection hole of the bottom plate (11).

11. The battery according to any one of claims 6, 7, 9 and 10, characterized in that The material of the battery box (1) is steel, and the material of the mounting beam (3) is aluminum.

12. An electrical device, characterized in that: The invention comprises a battery according to any one of claims 1 to 11, wherein the battery is used to provide electrical energy.

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