Battery box, battery and electric device

Abstract

The utility model relates to a battery box, a battery and an electric device. The battery box comprises a lower box body which comprises a bottom plate and a middle cross beam, and the middle cross beam is arranged on the bottom plate and longitudinally extends in the width direction of the bottom plate; u-shaped grooves are formed in the two lengthwise ends of the middle cross beam, the middle cross beam and the bottom plate are welded along the inner walls of the U-shaped grooves to form U-shaped welding marks, and the middle area between the two lengthwise ends of the middle cross beam is welded and fixed to the bottom plate; and the upper cover is arranged on the bottom plate in a covering manner, so that the upper cover and the bottom plate are jointly enclosed to form an accommodating cavity for accommodating the battery module, and the middle cross beam is used for bearing the battery module in the accommodating cavity. Thus, the U-shaped welding marks can bear stress in the width direction and the length direction of the bottom plate, so that the force borne by the middle of the middle cross beam can be shared, and the situation that the stress is concentrated in the middle area of the middle cross beam, and consequently the welding marks in the middle area of the middle cross beam crack is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery box, a battery and an electric device. BACKGROUND

[0002] With the development of new energy automobile technology, the requirement for the endurance mileage of batteries is getting higher and higher, especially in the field of commercial vehicles. Therefore, the volume of the battery box needs to be increased in order to accommodate larger battery modules. For large-size battery boxes, in order to ensure that the strength meets the requirements, an intermediate cross beam needs to be welded on the bottom plate of the battery box. Since the battery modules on both sides of the intermediate cross beam are installed on the intermediate cross beam, the stress on the intermediate cross beam is large. Thus, in the long-term use process, the welding marks between the intermediate cross beam and the bottom plate of the battery box are prone to cracking, resulting in the intermediate cross beam being unable to bear the battery modules. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a battery box, a battery and an electric device which can reduce the risk of cracking of the welding marks between the cross beam and the bottom plate of the battery box and improve the connection strength of the two.

[0004] A battery box comprises:

[0005] a lower box body comprising a bottom plate and an intermediate cross beam, the intermediate cross beam being arranged on the bottom plate and extending longitudinally along the width direction of the bottom plate; a U-shaped groove is formed at each longitudinal end of the intermediate cross beam, the intermediate cross beam and the bottom plate are welded along the inner wall of the U-shaped groove to form a U-shaped welding mark, and the middle region between the longitudinal two ends of the intermediate cross beam is welded and fixed to the bottom plate; and

[0006] an upper cover arranged on the bottom plate so that the upper cover and the bottom plate jointly enclose a receiving cavity for accommodating a battery module, and the intermediate cross beam is used for bearing the battery module in the receiving cavity.

[0007] In some embodiments, each U-shaped groove has two first side walls parallel to the length direction of the intermediate cross beam and a second side wall parallel to the width direction of the intermediate cross beam, the second side wall is connected between one end of the two first side walls, and the other end of the two first side walls forms an opening.

[0008] The U-shaped welding mark extends along one of the first side walls, the second side wall and the other first side wall in sequence.

[0009] In some embodiments, each longitudinal end of the intermediate cross beam has a plurality of U-shaped grooves, and one U-shaped welding mark is formed in each U-shaped groove.

[0010] In some embodiments, the intermediate cross beam has two side edges in the width direction of the intermediate cross beam, and the two side edges are welded to the bottom plate to form strip-shaped welds which extend along the length direction of the intermediate cross beam.

[0011] In some embodiments, one side edge of the intermediate cross beam in the width direction of the intermediate cross beam has a plurality of strip-shaped welds which are arranged along the length direction of the intermediate cross beam.

[0012] The other side edge of the intermediate cross beam in the width direction of the intermediate cross beam has a plurality of strip-shaped welds which are arranged along the length direction of the intermediate cross beam.

[0013] In some embodiments, both side edges of the intermediate cross beam in the width direction of the intermediate cross beam are provided with strip-shaped grooves which extend along the length direction of the intermediate cross beam, and the strip-shaped welds are formed in the strip-shaped grooves.

[0014] In some embodiments, the battery box further comprises a plurality of welding columns, each of which is arranged through the intermediate cross beam and the bottom plate and is welded and fixed to the intermediate cross beam and the bottom plate, and the plurality of welding columns are arranged along the length direction of the intermediate cross beam.

[0015] In some embodiments, the lower box body further comprises a first end cross beam and a second end cross beam, and the first end cross beam and the second end cross beam are welded and fixed to the bottom plate and are respectively located at the two ends of the bottom plate in the length direction.

[0016] The number of the battery modules is two, one of which is carried on the first end cross beam and the intermediate cross beam, and the other of which is carried on the second end cross beam and the intermediate cross beam.

[0017] A battery comprises a battery module and a battery box as claimed in any one of the above embodiments, and the battery module is arranged in the accommodation cavity and is supported and fixed to the intermediate cross beam.

[0018] A power consumption device comprises a battery as claimed in any one of the above embodiments.

[0019] The battery box, the battery and the power consumption device, the two ends of the intermediate cross beam are provided with U-shaped grooves, and the intermediate cross beam and the bottom plate are welded in the U-shaped grooves to form U-shaped welds. That is, in addition to the welding and fixation of the intermediate region of the intermediate cross beam to the bottom plate, the longitudinal two ends of the intermediate cross beam are also fixedly connected to the bottom plate through the U-shaped welds, which greatly enhances the connection firmness of the intermediate cross beam and the bottom plate. Further, the U-shaped welds can bear the stress along the width direction and the length direction of the bottom plate, so as to share the force borne by the middle part of the intermediate cross beam, and avoid the stress concentration in the middle region of the intermediate cross beam and the cracking of the welds in the middle region of the intermediate cross beam. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic exploded view of a battery according to an embodiment of the present application;

[0021] Figure 2 is a schematic exploded view of a battery according to an embodiment of the present application; Figure 1 is a schematic exploded view of a battery according to an embodiment of the present application;

[0022] Figure 3 is a schematic view of a middle cross beam of a battery box according to an embodiment of the present application (mainly showing the side surface facing away from the bottom plate); Figure 2

[0023] Figure 4 is a schematic view of a middle cross beam of a battery box according to an embodiment of the present application (mainly showing the side surface facing away from the bottom plate); Figure 2 DETAILED DESCRIPTION

[0024] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and that the present application is not limited to the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that the 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, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0027] ​​In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixedly" are used broadly and encompass both direct and indirect mounting, connecting, and fixing, such as fixed connection, detachable connection, or integral connection; both mechanical and electrical connections; and direct and indirect connections through intermediate media. Unless specifically stated otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixedly" should be understood, to those skilled in the art, in the context of the present application.

[0028] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixedly" are used broadly and encompass both direct and indirect mounting, connecting, and fixing, such as fixed connection, detachable connection, or integral connection; both mechanical and electrical connections; and direct and indirect connections through intermediate media. Unless specifically stated otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixedly" should be understood, to those skilled in the art, in the context of the present application.

[0029] It should be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element, or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for the purpose of illustration only and are not intended to be limiting.

[0030] Please refer to Figures 1 to 4 The present application provides a battery, which includes a battery module 30 and a battery box (not labeled in the figure), and the battery module 30 is accommodated in the battery box. The battery box is used to provide a containing space for the battery module 30. The battery box can adopt various structures, and the box body can also have various shapes, such as a cuboid. In the battery module 30, a plurality of battery monomers are included, and each battery monomer can be directly connected in series or parallel or mixed connection to form the battery module 30, which is accommodated in the battery box. The battery module 30 can also include other structures, for example, the battery module 30 can also include a busbar component for realizing electrical connection between the plurality of battery monomers. Each battery monomer can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0031] The battery box includes a lower housing 10 and an upper cover 20. The lower housing 10 includes a base plate 11 and a middle crossbeam 12. The middle crossbeam 12 is disposed on the base plate 11 and extends longitudinally along the width direction of the base plate 11. U-shaped grooves 121 are provided at both ends of the longitudinal length of the middle crossbeam 12 (see...). Figure 3 and Figure 4 The intermediate crossbeam 12 and the base plate 11 are welded together along the inner wall of the U-shaped groove 121 to form a U-shaped weld mark (not shown in the figure). The middle area between the two longitudinal ends of the intermediate crossbeam 12 is welded and fixed to the base plate 11. The upper cover 20 is placed on the base plate 11 so that the upper cover 20 and the base plate 11 together form a receiving cavity. The battery module 30 is received in the receiving cavity and supported on the intermediate crossbeam 12.

[0032] Thus, U-shaped grooves 121 are formed at both ends of the intermediate crossbeam 12, and the intermediate crossbeam 12 is welded to the base plate 11 within these U-shaped grooves 121, thereby forming a U-shaped weld mark. In other words, in addition to the central area being welded and fixed to the base plate 11, the longitudinal ends of the intermediate crossbeam 12 are also fixedly connected to the base plate 11 via U-shaped weld marks, greatly strengthening the connection between the intermediate crossbeam 12 and the base plate 11. Furthermore, these U-shaped weld marks can withstand forces along the width and length directions of the base plate 11, thereby distributing the force borne by the central part of the intermediate crossbeam 12 and preventing stress concentration in the central area of ​​the intermediate crossbeam 12, which could lead to weld cracking in the central area of ​​the intermediate crossbeam 12.

[0033] Specifically, in this embodiment, each U-shaped groove 121 has two first sidewalls 1211 parallel to the length direction of the intermediate crossbeam 12 and a second sidewall 1213 parallel to the width direction of the intermediate crossbeam 12. The second sidewall 1213 connects one end of the two first sidewalls 1211, and an opening is formed between the other ends of the two first sidewalls 1211. The aforementioned U-shaped solder joint extends sequentially along one of the first sidewalls 1211, the second sidewall 1213, and the other first sidewall 1211. Thus, since the U-shaped solder joint has sections extending along the length direction of the base plate 11 and sections extending along the width direction of the base plate 11, the U-shaped solder joint can share the force along the length and width directions of the base plate 11.

[0034] It should be noted that the end of the intermediate cross beam 12 in the length direction is not limited to having one U-shaped groove 121. In other embodiments, one end of the intermediate cross beam 12 in the length direction has a plurality of U-shaped grooves 121, and the other end of the intermediate cross beam 12 in the length direction also has a plurality of U-shaped grooves 121, and a U-shaped weld is formed in each U-shaped groove 121. That is, the two longitudinal ends of the intermediate cross beam 12 have a plurality of U-shaped welds, further enhancing the connection firmness of the two longitudinal ends of the intermediate cross beam 12 and the bottom plate 11, so that the two longitudinal ends of the intermediate cross beam 12 can share more force, further avoiding stress concentration in the middle region of the intermediate cross beam 12 and avoiding cracking of the welds in the middle region of the intermediate cross beam 12. Further, the U-shaped grooves 121 at the same end of the intermediate cross beam 12 are arranged along the width direction of the intermediate cross beam 12.

[0035] Specifically Figure 3 In the embodiment shown, one end of the intermediate cross beam 12 in the length direction has two U-shaped grooves 121, and the other end of the intermediate cross beam 12 in the length direction also has two U-shaped grooves 121, and a U-shaped weld is formed in each U-shaped groove 121. That is, the two ends of the intermediate cross beam 12 in the length direction have two U-shaped grooves 121, so that the two ends of the intermediate cross beam 12 in the length direction have two U-shaped welds.

[0036] It should be noted that the number of U-shaped grooves 121 on the end of the intermediate cross beam 12 is not limited to two, and in other embodiments it can be three, four, and so on, which can be set according to specific conditions and is not limited herein.

[0037] In the embodiment of the present application, the two side edges of the intermediate cross beam 12 in the width direction thereof are welded to the bottom plate 11 to form a strip-shaped weld 125, and the strip-shaped weld 125 extends longitudinally along the length direction of the intermediate cross beam 12. In this way, the strip-shaped weld 125 in the middle region of the intermediate cross beam 12 and the U-shaped welds at the ends thereof are used together to achieve the welding and fixation of the intermediate cross beam 12 to the bottom plate 11. Moreover, the U-shaped welds at the two ends of the intermediate cross beam 12 can share the stress in the middle region of the intermediate cross beam 12, avoiding stress concentration on the strip-shaped weld 125 in the middle region of the intermediate cross beam 12, and further avoiding cracking of the strip-shaped weld 125.

[0038] Further, one side edge of the intermediate cross beam 12 in the width direction thereof has a plurality of strip-shaped welds 125 arranged along the length direction of the intermediate cross beam 12, further improving the connection firmness of the intermediate cross beam 12 to the bottom plate 11. The other side edge of the intermediate cross beam 12 in the width direction thereof has a plurality of strip-shaped welds 125 arranged along the length direction of the intermediate cross beam 12, further improving the connection firmness of the intermediate cross beam 12 to the bottom plate 11.

[0039] Further, the intermediate cross beam 12 is provided with a strip-shaped slot 123 on each of the two sides in the width direction of the intermediate cross beam 12, which extends along the length direction of the intermediate cross beam 12. The strip-shaped weld mark 125 is formed in the strip-shaped slot 123, so as to avoid the strip-shaped weld mark 125 from being exposed to contact the battery module 30 and cause damage to the battery module 30.

[0040] It can be understood that the number of the strip-shaped slots 123 on each of the two sides in the width direction of the intermediate cross beam 12 is consistent with the number of the strip-shaped weld marks 125, and one strip-shaped weld mark 125 is formed in each of the strip-shaped slots 123.

[0041] In the embodiment of the present application, the battery box further comprises a plurality of welding columns 129 (see Figure 4 ). Each of the welding columns 129 is arranged through the intermediate cross beam 12 and the bottom plate 11 and is welded and fixed with the intermediate cross beam 12 and the bottom plate 11. The plurality of welding columns 129 are arranged at intervals along the length direction of the intermediate cross beam 12. In this way, the intermediate cross beam 12 is welded and fixed with the bottom plate 11 through the U-shaped weld mark, the strip-shaped weld mark 125 and the welding column 129, which further strengthens the connection firmness of the intermediate cross beam 12 and the bottom plate 11 and avoids stress concentration on the strip-shaped weld mark 125 to cause cracking.

[0042] In the implementation, the intermediate cross beam 12 is further provided with a weight-reducing hole 127, which is arranged to reduce the weight of the intermediate cross beam 12 and is beneficial to improve the mass energy density of the battery. Alternatively, the weight-reducing hole 127 can be a plurality of holes. For example, in the embodiment shown in Figure 3 , the number of the weight-reducing holes 127 is eight.

[0043] In the embodiment of the present application, the lower box body 10 further comprises a first end cross beam 13 and a second end cross beam 14. The first end cross beam 13 and the second end cross beam 14 are both welded and fixed on the bottom plate 11 and are respectively located at the two ends of the bottom plate 11 in the length direction. The number of the battery modules 30 is two, one of which is carried on the first end cross beam 13 and the intermediate cross beam 12, and the other of which is carried on the second end cross beam 14 and the intermediate cross beam 12. In this way, since the intermediate cross beam 12 and the bottom plate 11 are welded and fixed through the U-shaped weld mark, the strip-shaped weld mark 125 and the welding column 129, the connection between the intermediate cross beam 12 and the bottom plate 11 is firm, and stress concentration is avoided, thereby greatly reducing the risk of weld mark cracking.

[0044] Further, the lower box body 10 further comprises a first side plate 15 and a second side plate 16, which are respectively fixedly connected to the two longitudinal ends of the bottom plate 11. The upper cover 20 comprises a top plate 21, a third side plate 23 and a fourth side plate 25, which are respectively fixedly connected to the two sides of the top plate 21 in the width direction. When the upper cover 20 is arranged on the lower box body 10, the top plate 21 and the bottom plate 11 are arranged opposite to each other, and the length direction of the top plate 21 is consistent with the length direction of the bottom plate 11, and the width direction of the top plate 21 is consistent with the width direction of the bottom plate 11, so that the top plate 21, the bottom plate 11, the first side plate 15, the second side plate 16, the third side plate 23 and the fourth side plate 25 jointly form the above-mentioned accommodation cavity. Further, a sealing ring 40 is arranged between the upper cover 20 and the lower box body 10, which seals the gap between the upper cover 20 and the lower box body 10.

[0045] Based on the above-mentioned battery, the application further provides a power utilization device which uses the above-mentioned battery or battery monomer as its power supply. Specifically, the power utilization device can be a vehicle, especially a commercial electric vehicle. Of course, the power utilization device can also be a ship, a spacecraft and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the application do not specially limit the above-mentioned power utilization device.

[0046] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the description.

[0047] The above-mentioned embodiments only express several implementation manners of the application, the description is more specific and detailed, however, it should not be understood as the limitation of the patent application scope. It should be pointed out that, for the ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the application, which all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A battery box characterized by, The battery box comprises: a lower box body (10) comprising a bottom plate (11) and an intermediate cross beam (12) arranged on the bottom plate (11) and extending along the width direction of the bottom plate (11); a U-shaped groove (121) is formed at each longitudinal end of the intermediate cross beam (12), and the intermediate cross beam (12) and the bottom plate (11) are welded along the inner wall of the U-shaped groove (121) to form a U-shaped welding mark, and the middle region between the two longitudinal ends of the intermediate cross beam (12) is welded and fixed to the bottom plate (11); and an upper cover (20) arranged on the bottom plate (11) to form a receiving cavity together with the bottom plate (11) for accommodating a battery module (30), and the intermediate cross beam (12) is used for bearing the battery module (30) in the receiving cavity.

2. The battery pack of claim 1, wherein, Each U-shaped groove (121) has two first side walls (1211) parallel to the length direction of the intermediate cross beam (12) and a second side wall (1213) parallel to the width direction of the intermediate cross beam (12), the second side wall (1213) is connected between one end of the two first side walls (1211), and the other end of the two first side walls (1211) forms an opening; The U-shaped welding mark extends along one of the first side walls (1211), the second side wall (1213) and the other first side wall (1211) in sequence.

3. The battery pack of claim 1, wherein, Each longitudinal end of the intermediate cross beam (12) has a plurality of U-shaped grooves (121), and a U-shaped welding mark is formed in each U-shaped groove (121).

4. The battery pack of claim 1, wherein, The two side edges of the intermediate cross beam (12) in the width direction thereof are welded to the bottom plate (11) to form a strip-shaped welding mark (125) extending along the length direction of the intermediate cross beam (12).

5. The battery pack of claim 4, wherein, One side edge of the intermediate cross beam (12) in the width direction thereof has a plurality of strip-shaped welding marks (125) arranged at intervals along the length direction of the intermediate cross beam (12); The other side edge of the intermediate cross beam (12) in the width direction thereof has a plurality of strip-shaped welding marks (125) arranged at intervals along the length direction of the intermediate cross beam (12).

6. The battery pack of claim 4, wherein, Both side edges of the intermediate cross beam (12) in the width direction thereof are provided with strip-shaped grooves (123) extending along the length direction of the intermediate cross beam (12), and the strip-shaped welding marks (125) are formed in the strip-shaped grooves (123).

7. The battery pack of claim 1, wherein, The battery box further comprises a plurality of welding columns (129), each of which is arranged through the intermediate cross beam (12) and the bottom plate (11) and is welded and fixed to the intermediate cross beam (12) and the bottom plate (11); and the plurality of welding columns (129) are arranged at intervals along the length direction of the intermediate cross beam (12).

8. The battery pack of claim 1, wherein, The lower box body (10) further comprises a first end crossbeam (13) and a second end crossbeam (14), both of which are welded and fixed on the bottom plate (11) and located at both ends of the bottom plate (11) in the length direction respectively; The number of the battery modules (30) is two, one of which is carried on the first end crossbeam (13) and the middle crossbeam (12), and the other of which is carried on the second end crossbeam (14) and the middle crossbeam (12).

9. A battery, characterized by The battery box as claimed in any one of claims 1 to 8, wherein the battery module (30) is arranged in the accommodating cavity and supported and fixed on the middle crossbeam (12).

10. An electrical device, characterized by The battery as claimed in any one of claims 9.

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