Battery box and battery

Abstract

The utility model relates to a battery box and a battery. According to the battery box, a first heat exchange flow channel and a second heat exchange flow channel are formed in a bottom plate, and the first heat exchange flow channel and the second heat exchange flow channel are sequentially arranged in the width direction of the bottom plate and extend circuitously; the first end plate and the second end plate are arranged on the two opposite sides of the bottom plate in the length direction of the bottom plate, a first liquid inlet runner and a first liquid outlet runner are arranged in the first end plate, and a second liquid inlet runner and a second liquid outlet runner are arranged in the second end plate; wherein the first liquid inlet flow channel, the second heat exchange flow channel and the second liquid outlet flow channel are communicated in sequence, and the second liquid inlet flow channel, the first heat exchange flow channel and the first liquid outlet flow channel are communicated in sequence. According to the battery box and the battery provided by the invention, the existing external circuit and pipeline design is adopted, and the space utilization rate and the energy density can be improved.

Description

TECHNICAL FIELD

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

[0002] As a core component of energy storage and conversion, batteries have been widely used in new energy vehicles, energy storage power stations, ships, spacecraft and other fields.

[0003] Taking the application of batteries as power sources in the electric heavy truck industry as an example, in order to quickly adapt to more heavy truck models, the battery system of the heavy truck industry generally adopts a plurality of batteries connected in series and in parallel at present. These batteries are arranged on the battery rack of the heavy truck, and generally two batteries are arranged on the same layer, and the two batteries are arranged in a back-to-back manner.

[0004] The two batteries arranged in a back-to-back manner have the phenomenon of insufficient space utilization. Specifically, in order to ensure the assembly gap, a certain spacing is left between the two back-to-back batteries, and the spacing is generally controlled at 50 to 80 mm. If the spacing is reasonably utilized, the energy density of the entire battery system can be improved.

[0005] However, the external lines and pipelines connected with the battery rack and the batteries have been put into use at present. If a new battery is redesigned, the external lines and pipelines will inevitably be redesigned, which will increase the cost of users. If the existing external lines and pipelines are designed to be as universal as possible with the original external lines and pipelines, and the space utilization and energy density can be improved, this is a technical problem that needs to be considered by technical personnel in the industry. CONTENT OF THE INVENTION

[0006] Therefore, it is necessary to provide a battery box and a battery which can use the existing external line and pipeline design and improve the space utilization and energy density in view of the above problems.

[0007] A battery box, comprising:

[0008] a bottom plate having a first heat exchange flow channel and a second heat exchange flow channel therein, the first heat exchange flow channel and the second heat exchange flow channel being arranged and meanderingly extended in sequence along the width direction of the bottom plate; and

[0009] The first end plate and the second end plate are arranged on opposite sides of the bottom plate along the length direction of the bottom plate. The first end plate is provided with a first liquid inlet channel and a first liquid outlet channel. The second end plate is provided with a second liquid inlet channel and a second liquid outlet channel. The liquid inlet of the first liquid inlet channel and the liquid outlet of the first liquid outlet channel are arranged away from the bottom plate along the length direction of the bottom plate, and are arranged on opposite first and second ends of the first end plate along the width direction of the bottom plate. The liquid inlet of the second liquid inlet channel and the liquid outlet of the second liquid outlet channel are arranged away from the bottom plate along the length direction of the bottom plate, and are arranged on opposite first and second ends of the second end plate along the width direction of the bottom plate.

[0010] The first liquid inlet channel, the second heat exchange channel and the second liquid outlet channel are sequentially communicated, and the second liquid inlet channel, the first heat exchange channel and the first liquid outlet channel are sequentially communicated.

[0011] In some embodiments, the bottom plate has a first end surface and a second end surface arranged opposite along the length direction thereof. The first end surface is arranged towards the first end plate, and the second end surface is arranged towards the second end plate.

[0012] The outlet of the first heat exchange channel and the inlet of the second heat exchange channel are arranged on the first end surface and are close to each other along the width direction of the bottom plate. The inlet of the first heat exchange channel and the outlet of the second heat exchange channel are arranged on the second end surface and are away from each other along the width direction of the bottom plate.

[0013] In some embodiments, the first liquid inlet channel is formed by a first liquid inlet, a first liquid inlet section, a liquid inlet turning section and a liquid inlet transition section sequentially communicated in the first end plate.

[0014] The first liquid inlet section extends along the width direction of the bottom plate. The liquid inlet turning section extends downward along the thickness direction of the bottom plate relative to the first liquid inlet section. The liquid inlet transition section is arranged below the first liquid inlet section along the thickness direction of the bottom plate, and extends to the surface of the first end plate towards the first end surface along the width direction of the bottom plate, and is aligned with and communicated with the inlet of the second heat exchange channel.

[0015] In some embodiments, the first end plate comprises a first portion, a second portion and a third portion sequentially arranged along the width direction of the bottom plate.

[0016] The first part is provided with the first liquid inlet at a first end away from the second part, and has a first hole communicating with the first liquid inlet and extending to a surface of the first part facing the second part. The second part has a second hole extending inward from a surface of the second part facing the first part. The first hole and the second hole join to form the first liquid inlet section;

[0017] The surface of the second part facing the third part is provided with a first groove and a second groove. The first groove communicates with the second hole and extends downward relative to the second hole. The surface of the third part facing the second part is provided with a third groove and a fourth groove. The third groove and the first groove join to form the liquid inlet turning section. The fourth groove and the second groove are both below the first liquid inlet section and join to form the liquid inlet transition section.

[0018] In some embodiments, the first liquid outlet flow channel is formed by a liquid outlet transition section, a liquid outlet turning section, a first liquid outlet section and a first liquid outlet in the first end plate in sequence.

[0019] The liquid outlet transition section is arranged side by side with the liquid inlet transition section along the width direction of the bottom plate and is close to the first liquid inlet relative to the liquid inlet transition section. The liquid outlet transition section is aligned with and communicates with the outlet of the first heat exchange flow channel. The liquid outlet turning section extends downward relative to the liquid outlet transition section along the thickness direction of the bottom plate. The first liquid outlet section is arranged below the liquid outlet transition section along the thickness direction of the bottom plate and extends to the first liquid outlet in a direction away from the first liquid inlet along the width direction of the bottom plate.

[0020] In some embodiments, the first end plate includes a first part, a second part and a third part arranged in sequence along the width direction of the bottom plate.

[0021] The surface of the first part facing the second part is provided with a fifth groove and a sixth groove. The sixth groove extends downward relative to the fifth groove. The surface of the second part facing the first part is provided with a seventh groove and an eighth groove. The eighth groove extends downward relative to the seventh groove. The fifth groove and the seventh groove join to form the liquid outlet transition section. The sixth groove and the eighth groove join to form the liquid outlet turning section.

[0022] The third hole channel is in communication with the eighth groove and extends to the surface of the second portion facing the third portion. The third portion is provided with a fourth hole channel. The third hole channel and the fourth hole channel are both below the liquid outlet transition section and are spliced to form the first liquid outlet section. A first liquid outlet is formed at the second end of the third portion away from the second portion. The first liquid outlet is in communication with the fourth hole channel.

[0023] In some embodiments, the second end plate is provided with a second liquid inlet and a second liquid outlet at opposite first and second ends, respectively. The second end plate has a second liquid inlet section and a second liquid outlet section. The second liquid inlet is in communication with the second liquid inlet section to form the second liquid inlet channel. The second liquid outlet section is in communication with the second liquid outlet to form the second liquid outlet section.

[0024] In some embodiments, the second end plate includes a fifth portion and a sixth portion arranged opposite along the thickness direction of the bottom plate.

[0025] The second liquid inlet and the second liquid outlet are formed at the surface of the fifth portion facing away from the sixth portion. The fifth portion is provided with a ninth groove and a tenth groove at the bottom surface facing the sixth portion. The ninth groove is in communication with the second liquid inlet, and the tenth groove is in communication with the second liquid outlet. The sixth portion is recessed to form an eleventh groove and a twelfth groove at the top surface facing the fifth portion. The ninth groove and the eleventh groove are spliced to form the second liquid inlet section. The tenth groove and the twelfth groove are spliced to form the second liquid outlet section.

[0026] In some embodiments, the battery box further includes two longitudinal beams and a partition beam. The two longitudinal beams are arranged on opposite sides of the bottom plate along the width direction of the bottom plate. The two longitudinal beams, the bottom plate, the first end plate, and the second end plate jointly define a limiting space. The partition beam is arranged on the bottom plate and located between the two first end plates and the second end plate. The partition beam is connected with the two longitudinal beams. The partition beam divides the limiting space into a first limiting space and a second limiting space for limiting battery modules.

[0027] A battery, comprising:

[0028] The battery box according to any one of the preceding embodiments; and

[0029] A liquid inlet pipeline assembly includes a liquid inlet main pipeline and a liquid inlet branch pipeline. The liquid inlet main pipeline is in communication with the liquid inlet branch pipeline. The two ends of the liquid inlet branch pipeline are in communication with the liquid inlets of the first liquid inlet channel and the second liquid inlet channel, respectively.

[0030] The liquid outlet pipeline assembly includes a main liquid outlet pipe and a branch liquid outlet pipe. The main liquid outlet pipe is connected to the branch liquid outlet pipe, and the two opposite ends of the branch liquid outlet pipe are respectively connected to the outlets of the first liquid outlet channel and the second liquid outlet channel.

[0031] Two battery modules are mounted on the base plate and arranged along the length of the base plate.

[0032] In the aforementioned battery box and battery, the positions of the first liquid inlet and the first liquid outlet are the same as those of the liquid inlets and outlets of a conventional back-to-back battery, respectively. Similarly, the positions of the second liquid inlet and the second liquid outlet are the same as those of the liquid inlets and outlets of another conventional back-to-back battery. In this configuration, the battery box in this application can share the external piping design of a conventional back-to-back battery configuration, reducing the difficulty of redesigning the piping and maintaining the same cost for the user. Furthermore, when the battery box in this application is used within a battery, it can integrate two battery modules from a conventional back-to-back battery configuration. This saves space, improves space utilization, meets energy storage requirements, and increases energy density. Additionally, when the battery box in this application is used within a battery, electrical control panels can be designed on the two opposite ends of the battery box along the length of the base plate. This ensures that the external wiring of the battery box in this application is compatible with the conventional back-to-back battery configuration, eliminating the need for redesign and modification. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the connection between the battery box and external pipeline in one embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the battery structure in one embodiment of this application;

[0035] Figure 3 for Figure 2 The diagram shown is a structural schematic of the battery after the cover has been removed.

[0036] Figure 4 This is a schematic diagram of the battery box structure in one embodiment of this application;

[0037] Figure 5 for Figure 4 The diagram shows the structure of the base plate in the battery box.

[0038] Figure 6 for Figure 5 An enlarged schematic diagram of a portion of structure A in the base plate shown;

[0039] Figure 7 for Figure 5 The right view of the base plate shown;

[0040] Figure 8 Fig. 4 is an enlarged schematic view of a partial structure B in the bottom plate shown in Fig. 1; Figure 7

[0041] Figure 9 Fig. 5 is an enlarged schematic view of a partial structure C in the bottom plate shown in Fig. 1; Figure 7

[0042] Figure 10 Fig. 6 is an exploded view of a first end plate in the battery box shown in Fig. 1; Figure 4

[0043] Figure 11 Fig. 7 is an exploded view of the first end plate from another perspective shown in Fig. 6; Figure 10

[0044] Figure 12 Fig. 8 is a structural schematic view of a first portion in the first end plate shown in Fig. 6; Figure 11

[0045] Figure 13 Fig. 9 is a structural schematic view of a second portion in the first end plate shown in Fig. 6; Figure 11

[0046] Figure 14 Fig. 10 is an exploded view of a second end plate in the battery box shown in Fig. 1. Figure 4

[0047] Reference Signs:

[0048] 1000, battery;

[0049] 100, battery box; 200, battery module; 300, liquid inlet pipeline assembly; 400, liquid outlet pipeline assembly;

[0050] 10, bottom plate; 20, first end plate; 30, second end plate; 40, longitudinal beam; 50, cover; 60, partition beam; 70, first liquid inlet joint; 80, second liquid inlet joint; 90, first liquid outlet joint; 101, second liquid outlet joint; 11, first heat exchange flow channel; 111, first inlet; 112, first outlet; 12, second heat exchange flow channel; 121, second inlet; 122, second outlet; 13, first end face; 14, second end face;

[0051] ​​​​​​​21, first part; 211, first liquid inlet; 22, second part; 23, third part; 231, first liquid outlet; 24, first liquid inlet section; 241, first hole; 242, second hole; 25, liquid inlet transition section; 251, first groove; 252, third groove; 26, liquid inlet transition section; 261, second groove; 262, fourth groove; 27, liquid outlet transition section; 271, fifth groove; 272, seventh groove; 28, liquid outlet transition section; 281, sixth groove; 282, eighth groove; 29, first liquid outlet section; 291, third hole; 292, fourth hole;

[0052] 31, fifth part; 311, second liquid inlet; 312, second liquid outlet; 32, sixth part; 33, second liquid inlet section; 331, ninth groove; 332, eleventh groove; 34, second liquid outlet section; 341, tenth groove; 342, twelfth groove;

[0053] 41, first longitudinal beam; 42, second longitudinal beam; 43, first limiting space; 44, second limiting space;

[0054] 210, first battery module; 220, second battery module;

[0055] 310, main liquid inlet pipe; 320, branch liquid inlet pipe;

[0056] 410, main liquid outlet pipe; 420, branch liquid outlet pipe;

[0057] X, length direction; Y, width direction; Z, thickness direction. DETAILED DESCRIPTION

[0058] 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. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that other embodiments can be employed and structural or procedural changes can be made without departing from the scope of the present application.

[0059] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "liquid level", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation of the present application.

[0060] 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 "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0061] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, 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, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the liquid level of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the liquid level of the first feature is less than that of the second feature.

[0063] It is to be understood that when an element such as a layer, region or substrate 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 be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, when a member is referred to as being "coupled" or "connected" to another member, it can be directly coupled or connected to the other member or intervening members can be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Expressions such as "at least one of," when preceding the syllables of a list of elements, modify the entire list of elements and do not modify the elements individually.

[0064] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydraulic, thermal, wind and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0065] Taking the application of battery as power source in electric heavy truck industry as an example, in order to quickly adapt to more heavy truck models, the battery system of the current heavy truck industry generally adopts a plurality of batteries in series and parallel connection. These batteries are arranged on the battery rack of the heavy truck, and generally two batteries are arranged in the same layer, and the two batteries are arranged in a back-to-back manner.

[0066] The two batteries arranged in a back-to-back manner have the phenomenon of insufficient space utilization. Specifically, in order to ensure the assembly gap, a certain space is left between the two back-to-back batteries, which is generally controlled within 50 to 80 mm. If this space is reasonably utilized, the energy density of the whole battery system can be improved.

[0067] However, the external lines and pipelines connected with the battery rack and the battery have been put into use. If a new battery is redesigned, the external lines and pipelines will be redesigned, which will increase the cost of users. If the existing external lines and pipelines are designed to be as universal as possible with the original external lines and pipelines, and the space utilization and energy density can be improved, it is a technical problem that needs to be considered by technical personnel in the industry.

[0068] It can be understood that the two batteries arranged in a back-to-back manner are specifically arranged as follows: the battery has a front surface and a back surface, the back surfaces of the two batteries are close to each other, and the front surfaces of the two batteries are away from each other. The front surface of the battery refers to the surface provided with the electrical control panel and the pipeline, and the back surface of the battery refers to the surface facing away from the front surface. The electrical control panel refers to the panel for controlling the electrical elements inside the battery, the pipeline refers to the pipeline for circulating input and output of heat exchange medium into the battery to heat or cool the battery, and the line refers to the wire connecting the electrical control panel and the electrical elements.

[0069] Please refer to Figures 1 to 9In order to alleviate the above problems, the battery box 100 provided by the application comprises a bottom plate 10, a first end plate 20 and a second end plate 30. The bottom plate 10 has a first heat exchange flow channel 11 and a second heat exchange flow channel 12 which are independent of each other and are arranged in sequence and extend in a meandering manner along the width direction Y of the bottom plate 10. The first end plate 20 and the second end plate 30 are arranged on the opposite sides of the bottom plate 10 along the length direction X of the bottom plate 10, the first end plate 20 is provided with a first liquid inlet flow channel and a first liquid outlet flow channel, and the second end plate 30 is provided with a second liquid inlet flow channel and a second liquid outlet flow channel. The liquid inlet of the first liquid inlet flow channel and the liquid outlet of the first liquid outlet flow channel are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the first end plate 20 along the width direction Y of the bottom plate 10. The liquid inlet of the second liquid inlet flow channel and the liquid outlet of the second liquid outlet flow channel are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the second end plate 30 along the width direction Y of the bottom plate 10. The first liquid inlet flow channel, the second heat exchange flow channel 12 and the second liquid outlet flow channel are sequentially communicated, and the second liquid inlet flow channel, the first heat exchange flow channel 11 and the first liquid outlet flow channel are sequentially communicated.

[0070] The first heat exchange flow channel 11 and the second heat exchange flow channel 12 are arranged in sequence and extend in a meandering manner along the width direction Y of the bottom plate 10, which means that, for example, the first heat exchange flow channel 11 and the second heat exchange flow channel 12 each comprise straight sections, turning sections, straight sections, turning sections, … which are arranged alternately along the width direction Y of the bottom plate 10, the straight sections extend along the length direction X of the bottom plate 10, the turning sections connect between the adjacent two straight sections, and the flow directions of the heat exchange medium in the adjacent two straight sections are opposite.

[0071] As shown in the specific Figure 5 , the heat exchange medium flows in the first heat exchange flow channel in a meandering manner along the directions indicated by the arrows e and f alternately, and finally flows out along the direction indicated by the arrow g. The heat exchange medium flows in the second heat exchange flow channel in a meandering manner along the directions indicated by the arrows h and j alternately, and finally flows out along the direction indicated by the arrow k. Specifically, the first heat exchange flow channel 11 and the second heat exchange flow channel 12 can each be an “S”-shaped flow channel, a “Z”-shaped flow channel, etc.

[0072] The center axis of the bottom plate 10 extending along the length direction X thereof is defined as a reference line, in order to reduce the design difficulty, the first heat exchange flow channel 11 and the second heat exchange flow channel 12 are arranged in axial symmetry along the reference line. For example, Figure 5 and Figure 6 , in this design, the first heat exchange flow channel 11 is located on the left side of the reference line, and the second heat exchange flow channel 12 is located on the right side of the reference line.

[0073] The bottom plate 10 has a first end face 13 and a second end face 14 oppositely arranged along the length direction X of the bottom plate 10, the first end face 13 is arranged towards the first end plate 20, and the second end face 14 is arranged towards the second end plate 30. The outlet of the first heat exchange flow channel 11 and the inlet of the second heat exchange flow channel 12 are arranged on the first end face 13 and close to each other along the width direction Y of the bottom plate 10; the inlet of the first heat exchange flow channel 11 and the outlet of the second heat exchange flow channel 12 are arranged on the second end face 14 and away from each other along the width direction Y of the bottom plate 10. This design can prolong the length of the first heat exchange flow channel 11 and the second heat exchange flow channel 12, and prolong the flow time of the heat exchange medium in the first heat exchange flow channel 11 and the second heat exchange flow channel 12, so that the heat exchange effect is good.

[0074] For convenience of description, the inlet of the first heat exchange flow channel 11 is defined as the first inlet 111, the outlet of the first heat exchange flow channel 11 is defined as the first outlet 112, the inlet of the second heat exchange flow channel 12 is defined as the second inlet 121, and the outlet of the second heat exchange flow channel 12 is defined as the second outlet 122.

[0075] The outlet of the first heat exchange flow channel 11 and the inlet of the second heat exchange flow channel 12 are arranged on the first end face 13 and close to each other along the width direction Y of the bottom plate 10, and the inlet of the first heat exchange flow channel 11 and the outlet of the second heat exchange flow channel 12 are arranged on the second end face 14 and away from each other along the width direction Y of the bottom plate 10, that is, the distance between the first outlet 112 and the second inlet 121 is less than the distance between the first inlet 111 and the second outlet 122. Specifically, the first outlet 112 and the second inlet 121 are arranged close to the reference line, and the first inlet 111 and the second outlet 122 are arranged away from the reference line.

[0076] The first end plate 20 and the second end plate 30 are arranged on the opposite sides of the bottom plate 10 along the length direction X of the bottom plate 10, and the first end plate 20 and the second end plate 30 can be fixedly connected with the bottom plate 10 by welding.

[0077] The first end plate 20 is provided with a first liquid inlet flow channel and a first liquid outlet flow channel, and the second end plate 30 is provided with a second liquid inlet flow channel and a second liquid outlet flow channel. The first liquid inlet flow channel, the second heat exchange flow channel 12 and the second liquid outlet flow channel are sequentially communicated, and the second liquid inlet flow channel, the first heat exchange flow channel 11 and the first liquid outlet flow channel are sequentially communicated. Therefore, the heat exchange medium can flow through the first liquid inlet flow channel, the second heat exchange flow channel 12 and the second liquid outlet flow channel in sequence, and can flow through the second liquid inlet flow channel, the first heat exchange flow channel 11 and the first liquid outlet flow channel in sequence, so as to realize heat exchange of the battery module 200 located in the battery box 100. Optionally, the heat exchange medium can be liquid, alcohol or other liquid medium.

[0078] For the convenience of subsequent description, the inlet of the first liquid inlet flow channel is defined as the first liquid inlet 211, the inlet of the second liquid inlet flow channel is defined as the second liquid inlet 311, the outlet of the first liquid outlet flow channel is defined as the first liquid outlet 231, and the outlet of the second liquid outlet flow channel is defined as the second liquid outlet 312.

[0079] The inlet of the first liquid inlet flow channel and the outlet of the first liquid outlet flow channel are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the first end plate 20 along the width direction Y of the bottom plate 10, that is, the first liquid inlet 211 and the first liquid outlet 231 are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the first end plate 20 along the width direction Y of the bottom plate 10.

[0080] The inlet of the second liquid inlet flow channel and the outlet of the second liquid outlet flow channel are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the second end plate 30 along the width direction Y of the bottom plate 10, that is, the second liquid inlet 311 and the second liquid outlet 312 are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the second end plate 30 along the width direction Y of the bottom plate 10.

[0081] The first end of the first end plate 20 and the first end of the second end plate 30 are two same ends of the first end plate 20 and the second end plate 30 arranged along the width direction Y of the bottom plate 10, and the second end of the first end plate 20 and the second end of the second end plate 30 are the other two same ends of the first end plate 20 and the second end plate 30 arranged along the width direction Y of the bottom plate 10. Figure 5 Figure 6 For example, the first end of the first end plate 20 is the left end of the first end plate 20, the first end of the second end plate 30 is the left end of the second end plate 30, the second end of the second end plate 30 is the right end of the first end plate 20, and the second end of the second end plate 30 is the right end of the second end plate 30.

[0082] The inlet of the first liquid inlet flow channel and the outlet of the first liquid outlet flow channel are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the first end plate 20 along the width direction Y of the bottom plate 10, and the inlet of the second liquid inlet flow channel and the outlet of the second liquid outlet flow channel are arranged away from the bottom plate 10 along the length direction X of the bottom plate 10 and are arranged at the opposite first end and second end of the second end plate 30 along the width direction Y of the bottom plate 10, so that the path of the heat exchange medium flowing through the first liquid inlet flow channel, the second heat exchange flow channel 12 and the second liquid outlet flow channel, and the path of the heat exchange medium flowing through the second liquid inlet flow channel, the first heat exchange flow channel 11 and the first liquid outlet flow channel can be greatly prolonged, the time length of the heat exchange medium staying in the battery box 100 is improved, and the utilization rate of the heat exchange medium is high.

[0083] ​In the present application, the positions of the first liquid inlet 211 and the first liquid outlet 231 are the same as the positions of the liquid inlet and the liquid outlet of a conventional battery 1000 arranged back to back, and the positions of the second liquid inlet 311 and the second liquid outlet 312 are the same as the positions of the liquid inlet and the liquid outlet of another conventional battery 1000 arranged back to back. In this case, the battery box 100 in the present application can share the external pipeline design of the two conventional batteries 1000 arranged back to back, reducing the difficulty of pipeline redesign and not increasing the user cost.

[0084] In addition, when the battery box 100 in the present application is applied to the battery 1000, two battery modules 200 can be installed in the battery box 100, and the two battery modules 200 are defined as a first battery module 200 and a second battery module 200. The first battery module 200 and the second battery module 200 are arranged on the bottom plate 10 and are arranged along the length direction X of the bottom plate 10. The heat exchange medium in the first heat exchange channel 11 and the second heat exchange channel 12 can simultaneously exchange heat with the first battery module 200 and the second battery module 200.

[0085] The first battery module 200 and the second battery module 200 are arranged side by side in the same battery box 100. Compared with the conventional arrangement of the first battery module 200 and the second battery module 200 side by side in two different battery boxes 100, the spacing between the first battery module 200 and the second battery module 200 can be designed to be smaller. In this way, the space is saved, the space utilization is improved, the energy storage demand is met, and the energy density is improved.

[0086] In addition, when the battery box 100 in the present application is applied to the battery 1000, an electrical control panel can be designed on the two end faces of the battery box 100 in the present application arranged relative to the length direction X of the bottom plate 10. The electrical control panels on the two end faces control the first battery module 200 and the second battery module 200 in the battery box 100, respectively. Each electrical control panel is used to control the first battery module 200 or the second battery module 200 close to itself. In this case, the first battery module 200 or the second battery module 200 is independently controlled, and each has its own electrical control panel. The electrical function is consistent with the original battery 1000 back-to-back mode, ensuring that the external lines of the battery box 100 in the present application can be used with the conventional back-to-back connection scheme of two batteries 1000, without the need for new design and improvement.

[0087] As described above, when the battery box 100 in the present application is applied to the battery 1000, the conventional external lines and pipeline design can be shared, and the space utilization and energy density can be improved.

[0088] Please refer again to Figures 4 to 13 In some embodiments, the first liquid inlet channel is formed by the first liquid inlet 211, the first liquid inlet section 24, the liquid inlet turning section 25 and the liquid inlet transition section 26 in the first end plate 20 in sequence. The first liquid inlet section 24 extends from the first liquid inlet 211 along the width direction Y of the bottom plate 10, the liquid inlet turning section 25 extends downward along the thickness direction Z of the bottom plate 10 relative to the first liquid inlet section 24, and the liquid inlet transition section 26 is arranged below the first liquid inlet section 24 along the thickness direction Z of the bottom plate 10 and extends from the liquid inlet transition section 26 to the surface of the first end plate 20 facing the first end face 13 along the width direction Y of the bottom plate 10, and is aligned with and communicates with the inlet of the second heat exchange channel 12. In this way, the heat exchange medium is input into the second heat exchange channel 12 in sequence through the first liquid inlet 211, the first liquid inlet section 24, the first turning section and the liquid inlet transition section 26, and is output by the second liquid outlet channel after flowing through the second heat exchange channel 12.

[0089] Specifically, the first liquid inlet 211 is arranged on the top surface of the first end plate 20.

[0090] In some embodiments, the first end plate 20 includes a first portion 21, a second portion 22 and a third portion 23 arranged in sequence along the width direction Y of the bottom plate 10. The first portion 21 is provided with the first liquid inlet 211 away from the first end of the second portion 22, and the first portion 21 has a first hole 241 therein, which communicates with the first liquid inlet 211 and extends to the surface of the first portion 21 facing the second portion 22. The second portion 22 has a second hole 242 extending inward from the surface of the second portion 22 facing the first portion 21, and the first hole 241 and the second hole 242 are spliced to form the first liquid inlet section 24. The surface of the second portion 22 facing the third portion 23 is provided with a first recess 251 and a second recess 261, and the first recess 251 communicates with and extends downward relative to the second hole 242; the surface of the third portion 23 facing the second portion 22 is provided with a third recess 252 and a fourth recess 262, and the third recess 252 and the first recess 251 are spliced to form the liquid inlet turning section 25, and the fourth recess 262 and the second recess 261 are both below the first liquid inlet section 24 and are spliced to form the liquid inlet transition section 26.

[0091] It can be understood that the first end of the first portion 21 away from the first end of the second portion 22 is the first end of the first end plate 20.

[0092] The first hole 241 extends from the first liquid inlet 211 to the surface of the first portion 21 facing the second portion 22 along the width direction Y of the bottom plate 10. The second hole 242 extends inwardly in the second portion 22 from the surface of the second portion 22 facing the first portion 21 along the width direction Y of the bottom plate 10. The second hole 242 and the first hole 241 are spliced to form the first liquid inlet section 24 along the width direction Y of the bottom plate 10. The surface of the third portion 23 facing the second portion 22 is provided with a third groove 252 and a fourth groove 262. The third groove 252 and the first groove 251 are spliced to form the liquid inlet turning section 25 along the width direction Y of the bottom plate 10. The second groove 261 extends from the first groove 251 to the surface of the second portion 22 facing the first end surface 13 along the length direction X of the bottom plate 10. The fourth groove 262 extends from the third groove 252 to the surface of the third portion 23 facing the first end surface 13 along the length direction X of the bottom plate 10. The fourth groove 262 and the second groove 261 are spliced to form the liquid inlet transition section 26 along the width direction Y of the bottom plate 10.

[0093] The first portion 21, the second portion 22 and the third portion 23 can be spliced to form the first end plate 20 by welding.

[0094] The first portion 21, the second portion 22 and the third portion 23 are spliced to form the first end plate 20, which facilitates the arrangement of the first liquid inlet 211, the first liquid inlet section 24, the liquid inlet turning section 25 and the liquid inlet transition section 26 in the first end plate 20, and reduces the processing difficulty of the first liquid inlet 211, the first liquid inlet section 24, the liquid inlet turning section 25 and the liquid inlet transition section 26.

[0095] In some embodiments, the first liquid outlet channel is formed by the liquid outlet transition section 27, the liquid outlet turning section 28, the first liquid outlet section 29 and the first liquid outlet 231 in the first end plate 20 in sequence. The liquid outlet transition section 27 is arranged side by side with the liquid inlet transition section 26 along the width direction Y of the bottom plate 10 and is closer to the first liquid inlet 211 than the liquid inlet transition section 26. The liquid outlet transition section 27 is aligned with and communicates with the outlet of the first heat exchange channel 11, and extends inward from the surface of the first end plate 20 toward the first end face 13 along the width direction Y of the bottom plate 10. The liquid outlet turning section 28 extends downward relative to the liquid outlet transition section 27 along the thickness direction Z of the bottom plate 10. The first liquid outlet section 29 is arranged below the liquid outlet transition section 27 along the thickness direction Z of the bottom plate 10 and extends to the first liquid outlet 231 in a direction away from the first liquid inlet 211 along the width direction Y of the bottom plate 10. In this way, the heat exchange medium can pass through the first liquid inlet channel, the first heat exchange channel 11, the liquid outlet transition section 27, the liquid outlet turning section 28, the first liquid outlet section 29 and the first liquid outlet 231 in sequence and be output. Moreover, in this design, the first liquid outlet channel formed by the liquid outlet transition section 27, the liquid outlet turning section 28, the first liquid outlet section 29 and the first liquid outlet 231 does not interfere with the first liquid inlet channel, ensuring the reliability of heat exchange.

[0096] Specifically, the first liquid outlet 231 is arranged on the top surface of the first end plate 20.

[0097] In some embodiments, the surface of the first part 21 facing the second part 22 is provided with a fifth groove 271 and a sixth groove 281. The fifth groove 271 extends inward from the first part 21 toward the surface of the first end face 13 along the length direction X of the bottom plate 10. The sixth groove 281 extends downward relative to the fifth groove 271. The surface of the second part 22 facing the first part 21 is provided with a seventh groove 272 and an eighth groove 282. The seventh groove 272 extends inward from the second part 22 toward the surface of the first end face 13 along the length direction X of the bottom plate 10. The eighth groove 282 extends downward relative to the seventh groove 272. The fifth groove 271 and the seventh groove 272 are spliced to form the liquid outlet transition section 27 along the width direction Y of the bottom plate 10. The sixth groove 281 and the eighth groove 282 are spliced to form the liquid outlet turning section 28 along the width direction Y of the bottom plate 10. The third hole 291 is arranged in the second part 22 and communicates with the eighth groove 282 and extends to the surface of the second part 22 facing the third part 23. The fourth hole 292 is arranged in the third part 23 and extends inward from the surface of the second part 22 toward the first end face 13. The third hole 291 and the fourth hole 292 are both below the liquid outlet transition section 27 and are spliced to form the first liquid outlet section 29. The first liquid outlet 231 is arranged in the second end of the third part 23 away from the second part 22 and communicates with the fourth hole 292.

[0098] The first end plate 20 is formed by splicing the first part 21, the second part 22 and the third part 23, which facilitates the arrangement of the liquid outlet transition section 27, the liquid outlet turning section 28, the first liquid outlet section 29 and the first liquid outlet 231 in the first end plate 20, and reduces the processing difficulty of the liquid outlet transition section 27, the liquid outlet turning section 28, the first liquid outlet section 29 and the first liquid outlet 231.

[0099] In some embodiments, the second end plate 30 is provided with a second liquid inlet 311 and a second liquid outlet 312 at opposite first and second ends thereof, respectively. The second end plate 30 has a second liquid inlet section 33 and a second liquid outlet section 34. The second liquid inlet 311 and the second liquid inlet section 33 are in communication to form a second liquid inlet flow channel, and the second liquid inlet section 33 is arranged towards the second end face 14 of the bottom plate 10 at an end thereof away from the second liquid inlet 311 and is aligned with and communicates with the inlet of the first heat exchange flow channel 11. The second liquid outlet section 34 and the second liquid outlet 312 are in communication to form a second liquid outlet flow channel, and the second liquid outlet section 34 is arranged towards the second end face 14 of the bottom plate 10 at an end thereof away from the second liquid outlet 312 and is aligned with and communicates with the outlet of the second heat exchange flow channel 12. In this way, the heat exchange medium is input into the first heat exchange flow channel 11 through the second liquid inlet 311 and the second liquid inlet section 33 in sequence to perform heat exchange, and the heat exchange medium after heat exchange in the second heat exchange flow channel 12 is output to the outside through the second liquid outlet section 34 and the second liquid outlet 312 in sequence.

[0100] Specifically, the second liquid inlet 311 is arranged at the first end of the second end plate 30, the second liquid outlet 312 is arranged at the second end of the second end plate 30, the second liquid inlet section 33 extends from the second liquid inlet 311 to the surface of the second end plate 30 towards the second end face 14, and the second liquid outlet section 34 extends inwardly from the surface of the second end plate 30 towards the second end face 14 to the second liquid outlet 312.

[0101] Please refer to Figure 14 Further, in some embodiments, the second end plate 30 includes a fifth part 31 and a sixth part 32 arranged opposite along the thickness direction Z of the bottom plate 10. The surface of the fifth part 31 facing away from the sixth part 32 is provided with the second liquid inlet 311 and the second liquid outlet 312. The bottom surface of the fifth part 31 facing the sixth part 32 is provided with a ninth groove 331 and a tenth groove 341, the ninth groove 331 is in communication with the second liquid inlet 311, and the tenth groove 341 is in communication with the second liquid outlet 312. The top surface of the sixth part 32 facing the fifth part 31 is recessed to form an eleventh groove 332 and a twelfth groove 342, the ninth groove 331 and the eleventh groove 332 splice to form the second liquid inlet section 33, and the tenth groove 341 and the twelfth groove 342 splice to form the second liquid outlet section 34.

[0102] The fifth part 31 and the sixth part 32 can be spliced to form the second end plate 30 by welding.

[0103] The form of splicing the fifth part 31 and the sixth part 32 to form the second end plate 30 facilitates the arrangement of the second liquid inlet section 33 and the second liquid outlet section 34 in the second end plate 30, and reduces the processing difficulty of the second liquid inlet section 33 and the second liquid outlet section 34.

[0104] Please refer to Figures 2 to 4 In some embodiments, the battery box 100 further comprises two longitudinal beams 40 and a partition beam 60, the two longitudinal beams 40 are arranged on opposite sides of the bottom plate 10 along the width direction Y of the bottom plate 10, the two longitudinal beams 40, the bottom plate 10, the first end plate 20 and the second end plate 30 jointly define a limiting space, the partition beam 60 is arranged on the bottom plate 10 and located between the two first end plates 20 and the second end plate 30, and the partition beam 60 is connected with the two longitudinal beams 40, the partition beam 60 divides the limiting space into a first limiting space 43 and a second limiting space 44 for limiting the battery module 200.

[0105] The two longitudinal beams 40 are defined as a first longitudinal beam 41 and a second longitudinal beam 42, the first longitudinal beam 41, the second longitudinal beam 42, the first end plate 20, the partition beam 60 and the bottom plate 10 jointly define the first limiting space 43, and the first longitudinal beam 41, the second longitudinal beam 42, the second end plate 30, the partition beam 60 and the bottom plate 10 jointly define the second limiting space 44. The first battery module 200 is limited in the first limiting space 43, and the two ends of the first battery module 200 arranged oppositely along the length direction X of the bottom plate 10 are detachably connected with the first end plate 20 and the partition beam 60 respectively, and the second battery module 200 is limited in the second limiting space 44, and the two ends of the second battery module 200 arranged oppositely along the length direction X of the bottom plate 10 are detachably connected with the second end plate 30 and the partition beam 60 respectively.

[0106] The arrangement of the first longitudinal beam 41, the second longitudinal beam 42 and the partition beam 60 can position and limit the first battery module 200 and the second battery module 200, and facilitate the subsequent installation and fixation of the first battery module 200 and the second battery module 200.

[0107] For example, the first battery module 200 is connected with the first end plate 20 and the partition beam 60 by screws, and the second battery module 200 is connected with the second end plate 60 and the partition beam 60 by screws.

[0108] In some embodiments, the battery box 100 further comprises 50, which is defined with the first longitudinal beam 41, the second longitudinal beam 42, the first end plate 20, the second end plate 30 and the bottom plate 10 to form a space for accommodating the battery module 200, so as to isolate the battery module 200 from external liquid vapor and the like.

[0109] Please refer to Figure 1 , Figure 5 and Figure 6The application further provides a battery 1000, which comprises the liquid inlet pipeline assembly 300, the liquid outlet pipeline assembly 400, two battery modules 200 and the battery box 100 according to any one of the above embodiments. The liquid inlet pipeline assembly 300 comprises a liquid inlet main pipeline 310 and a liquid inlet branch pipeline 320, the liquid inlet main pipeline 310 communicates with the liquid inlet branch pipeline 320, and opposite ends of the liquid inlet branch pipeline 320 respectively communicate with the liquid inlet of the first liquid inlet flow channel and the liquid inlet of the second liquid inlet flow channel. The liquid outlet pipeline assembly 400 comprises a liquid outlet main pipeline 410 and a liquid outlet branch pipeline 420, the liquid outlet main pipeline 410 communicates with the liquid outlet branch pipeline 420, and opposite ends of the liquid outlet branch pipeline 420 respectively communicate with the liquid outlet of the first liquid outlet flow channel and the liquid outlet of the second liquid outlet flow channel. The two battery modules 200 are arranged on the bottom plate 10 and are arranged along the length direction X of the bottom plate 10. The two battery modules 200 are both heat-exchanged by the heat exchange medium in the first heat exchange flow channel 11 and the second heat exchange flow channel 12.

[0110] In this way, the heat exchange medium input through the liquid inlet main pipeline 310 is distributed into the second heat exchange flow channel 12 through the liquid inlet branch pipeline 320 through the first liquid inlet flow channel, and is distributed into the first heat exchange flow channel 11 through the second liquid inlet flow channel, and then the heat exchange medium in the first heat exchange flow channel 11 is heat-exchanged and enters the liquid outlet branch pipeline 420 through the first liquid outlet flow channel, the heat exchange medium in the second heat exchange flow channel 12 is heat-exchanged and enters the liquid outlet branch pipeline 420 through the second liquid outlet flow channel, and finally converges and outputs through the liquid outlet main pipeline 410.

[0111] The liquid inlet pipeline assembly 300 and the liquid outlet pipeline assembly 400 jointly form the external pipeline when the conventional battery 1000 is arranged back-to-back.

[0112] Specifically as shown in the figure, Figure 1 the heat exchange medium in the liquid inlet branch pipeline 320 is input into the first liquid inlet flow channel along the direction indicated by the arrow a, and after heat exchange, the heat exchange medium in the second liquid outlet flow channel is input into the liquid outlet branch pipeline 420 along the direction indicated by the arrow b; the heat exchange medium in the liquid inlet branch pipeline 320 is input into the second liquid inlet flow channel along the direction indicated by the arrow c, and after heat exchange, the heat exchange medium in the first liquid outlet flow channel is input into the liquid outlet branch pipeline 420 along the direction indicated by the arrow d. The battery 1000 in the application has the effects brought by any one of the above embodiments, and thus will not be described here.

[0113] To facilitate the first end plate 20 and the second end plate 30 to be connected with the liquid inlet pipeline assembly 300 and the liquid outlet pipeline assembly 400, the battery box 100 further comprises a first liquid inlet connector 70, a second liquid inlet connector 80, a first liquid outlet connector 90 and a second liquid outlet connector 101. The first liquid inlet connector 70 is installed at the first liquid inlet 211 and communicates with one end of the liquid inlet branch pipeline 320. The first liquid outlet connector 90 is installed at the first liquid outlet 231 and communicates with one end of the liquid outlet branch pipeline 420. The second liquid inlet connector 80 is installed at the second liquid inlet 311 and communicates with the other end of the liquid inlet branch pipeline 320. The second liquid outlet connector 101 is installed at the second liquid outlet 312 and communicates with the other end of the liquid outlet branch pipeline 420.

[0114] The battery box 100 and the battery 1000 described above, the positions of the first liquid inlet 211 and the first liquid outlet 231 are the same as the positions of the liquid inlets of a battery 1000 arranged in a back-to-back manner and the liquid inlets of another battery 1000 arranged in a back-to-back manner, respectively. In this case, the battery box 100 in the present application can share the external pipeline design of the two batteries 1000 arranged in a back-to-back manner, reducing the difficulty of pipeline redesign and not increasing the user cost. In addition, when the battery box 100 in the present application is applied to the battery 1000, two battery modules 200 in the two batteries 1000 arranged in a back-to-back manner can be integrated in the battery box 100, so that the space is saved and the space utilization is improved, and the energy storage demand is also met, and the energy density is improved. In addition, when the battery box 100 in the present application is applied to the battery 1000, an electrical control panel can be designed on the two end surfaces of the battery box 100 arranged in the length direction X of the bottom plate 10, so as to ensure that the external lines of the battery box 100 in the present application can be used for the two batteries 1000 arranged in a back-to-back manner, without the need for new design and improvement.

[0115] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as within the scope of the present application.

[0116] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery box characterized by, The battery box comprises: a bottom plate having a first heat exchange flow channel and a second heat exchange flow channel arranged therein in sequence and extending in a meandering manner along a width direction of the bottom plate; and a first end plate and a second end plate arranged on opposite sides of the bottom plate along a length direction of the bottom plate, the first end plate being provided with a first liquid inlet flow channel and a first liquid outlet flow channel therein, and the second end plate being provided with a second liquid inlet flow channel and a second liquid outlet flow channel therein; a liquid inlet of the first liquid inlet flow channel and a liquid outlet of the first liquid outlet flow channel being arranged away from the bottom plate along the length direction of the bottom plate and on opposite first and second ends of the first end plate along the width direction of the bottom plate; a liquid inlet of the second liquid inlet flow channel and a liquid outlet of the second liquid outlet flow channel being arranged away from the bottom plate along the length direction of the bottom plate and on opposite first and second ends of the second end plate along the width direction of the bottom plate; wherein the first liquid inlet flow channel, the second heat exchange flow channel and the second liquid outlet flow channel are sequentially communicated, and the second liquid inlet flow channel, the first heat exchange flow channel and the first liquid outlet flow channel are sequentially communicated.

2. The battery pack of claim 1, wherein, The bottom plate has a first end surface and a second end surface arranged oppositely along the length direction thereof, the first end surface being arranged towards the first end plate, and the second end surface being arranged towards the second end plate; an outlet of the first heat exchange flow channel and an inlet of the second heat exchange flow channel being arranged on the first end surface and moving towards each other along the width direction of the bottom plate; and an inlet of the first heat exchange flow channel and an outlet of the second heat exchange flow channel being arranged on the second end surface and moving away from each other along the width direction of the bottom plate.

3. The battery pack of claim 2, wherein, The first liquid inlet flow channel is formed by a first liquid inlet, a first liquid inlet section, a liquid inlet turning section and a liquid inlet transition section arranged in sequence in the first end plate; the first liquid inlet section extending along the width direction of the bottom plate, the liquid inlet turning section extending downwardly along a thickness direction of the bottom plate relative to the first liquid inlet section, and the liquid inlet transition section being arranged below the first liquid inlet section along the thickness direction of the bottom plate and extending to a surface of the first end plate towards the first end surface along the width direction of the bottom plate and being aligned with and communicated with the inlet of the second heat exchange flow channel.

4. The battery pack of claim 3, wherein, The first end plate comprises a first portion, a second portion and a third portion arranged in sequence along the width direction of the bottom plate; the first portion being provided with the first liquid inlet away from a first end of the second portion, the first portion having a first hole therein communicated with the first liquid inlet and extending to a surface of the first portion towards the second portion, the second portion having a second hole extending inwardly from a surface of the second portion towards the first portion, and the first hole and the second hole being jointed to form the first liquid inlet section; and the third portion being provided with the first liquid outlet away from a second end of the second portion, the third portion having a third hole therein communicated with the first liquid outlet and extending to a surface of the third portion towards the second portion, the second portion having a fourth hole extending inwardly from a surface of the second portion towards the third portion, and the third hole and the fourth hole being jointed to form the first liquid outlet section. The surface of the second part towards the third part is provided with a first groove and a second groove, the first groove is communicated with the second channel and extends downward relative to the second channel; the surface of the third part towards the second part is provided with a third groove and a fourth groove, the third groove is spliced with the first groove to form the liquid inlet transition section, and the fourth groove and the second groove are both located below the first liquid inlet section and are spliced to form the liquid inlet transition section.

5. The battery pack of claim 3, wherein, The first liquid outlet channel is formed by the liquid outlet transition section, the liquid outlet transition section, the first liquid outlet section and the first liquid outlet in the first end plate in sequence. The liquid outlet transition section is arranged side by side along the width direction of the bottom plate on one side of the liquid inlet transition section and is close to the first liquid inlet section relative to the liquid inlet transition section, the liquid outlet transition section is aligned with and communicated with the outlet of the first heat exchange channel, the liquid outlet transition section extends downward along the thickness direction of the bottom plate relative to the liquid outlet transition section, the first liquid outlet section is arranged below the liquid outlet transition section along the thickness direction of the bottom plate and extends to the first liquid outlet in the direction away from the first liquid inlet section in the width direction of the bottom plate.

6. The battery pack of claim 5, wherein, The first end plate comprises a first part, a second part and a third part arranged in sequence along the width direction of the bottom plate; The surface of the first part towards the second part is provided with a fifth groove and a sixth groove, the sixth groove extends downward relative to the fifth groove, the surface of the second part towards the first part is provided with a seventh groove and an eighth groove, the eighth groove extends downward relative to the seventh groove, the fifth groove and the seventh groove are spliced to form the liquid outlet transition section, and the sixth groove and the eighth groove are spliced to form the liquid outlet transition section. The third channel is arranged in the second part and communicated with the eighth groove and extends to the surface of the second part towards the third part, the fourth channel is arranged in the third part, and the third channel and the fourth channel are both located below the liquid outlet transition section and are spliced to form the first liquid outlet section, and the first liquid outlet is opened in the second end of the third part away from the second part, and the first liquid outlet is communicated with the fourth channel.

7. The battery pack of claim 1, wherein, The second end plate is provided with a second liquid inlet and a second liquid outlet at the first end and the second end respectively, the second end plate has a second liquid inlet section and a second liquid outlet section, the second liquid inlet is communicated with the second liquid inlet section to form the second liquid inlet channel, and the second liquid outlet section is communicated with the second liquid outlet to form the second liquid outlet section.

8. The battery pack of claim 7, wherein, The second end plate comprises a fifth part and a sixth part arranged opposite along the thickness direction of the bottom plate; The fifth part is provided with the second liquid inlet and the second liquid outlet on the surface thereof facing away from the sixth part, the fifth part is provided with a ninth groove and a tenth groove on the bottom surface thereof facing the sixth part, the ninth groove is communicated with the second liquid inlet, the tenth groove is communicated with the second liquid outlet, the sixth part is recessed to form an eleventh groove and a twelfth groove on the top surface thereof facing the fifth part, the ninth groove and the eleventh groove are spliced to form the second liquid inlet section, and the tenth groove and the twelfth groove are spliced to form the second liquid outlet section.

9. The battery pack of claim 1, wherein, The battery box further comprises two longitudinal beams and a partition beam, the two longitudinal beams are arranged on opposite sides of the bottom plate along the width direction of the bottom plate, the two longitudinal beams, the bottom plate, the first end plate and the second end plate jointly define a limiting space, the partition beam is arranged on the bottom plate and located between the two first end plates and the second end plate, and the partition beam is connected with the two longitudinal beams, the partition beam divides the limiting space into a first limiting space and a second limiting space for limiting battery modules.

10. A battery, characterized by The battery comprises: The battery box according to any one of claims 1 to 9; and The liquid inlet pipeline assembly comprises a liquid inlet main pipeline and a liquid inlet branch pipeline, the liquid inlet main pipeline is communicated with the liquid inlet branch pipeline, and opposite ends of the liquid inlet branch pipeline are respectively communicated with the liquid inlets of the first liquid inlet flow channel and the second liquid inlet flow channel; The liquid outlet pipeline assembly comprises a liquid outlet main pipeline and a liquid outlet branch pipeline, the liquid outlet main pipeline is communicated with the liquid outlet branch pipeline, and opposite ends of the liquid outlet branch pipeline are respectively communicated with the liquid outlets of the first liquid outlet flow channel and the second liquid outlet flow channel; The two battery modules are arranged on the bottom plate and arranged along the length direction of the bottom plate.

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