Battery device, energy storage device and electric equipment

Abstract

The utility model relates to the technical field of battery equipment, and discloses a battery device, an energy storage device and electric equipment. The battery device comprises a battery box body used for accommodating a battery monomer; the liquid cooling structure is assembled on the battery box body, at least part of the side walls of the battery monomers abut against the liquid cooling structure, the liquid cooling structure comprises a liquid cooling plate and a flow guide part, the flow guide part is connected to one end of the liquid cooling plate, the liquid cooling plate is provided with a plurality of liquid inlet flow channels and a plurality of liquid return flow channels, and the flow guide part is provided with a plurality of communication flow channels; the multiple liquid inlet flow channels communicate with the multiple communicating flow channels in a one-to-one correspondence mode, and the multiple liquid return flow channels communicate with the multiple communicating flow channels in a one-to-one correspondence mode. By applying the technical scheme, the problem that abnormal noise is generated due to vortex generated by converging and rotating flow of cooling liquid in a liquid cooling plate of a battery device in the related technology is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of battery equipment, and in particular relates to a battery device, an energy storage device and an electrical device. Background Art

[0002] In the related art, the battery device uses a liquid cooling plate to dissipate heat and cool down, and uses the circulating coolant to take away the heat generated by the battery cells during charging and discharging. In the liquid cooling plate of the battery device, during the flow of the coolant, the coolant flows in multiple liquid inlet channels, and when the coolant flows to the end of the liquid inlet channel, it converges and flows in a swirling manner to be divided into multiple liquid return channels. When the coolant converges and flows in a swirling manner, the coolant will impact the inner wall of the channel to generate eddy currents, which in turn causes abnormal noise. Utility Model Content

[0003] The purpose of the present application is to provide a battery device, an energy storage device and an electrical device, including but not limited to solving the problem of abnormal noise caused by the convergence and swirling flow of coolant in the liquid cooling plate of the battery device in the related art, which generates eddy currents.

[0004] To achieve the above object, according to a first aspect of an embodiment of the present application, a battery device is provided, comprising:

[0005] A battery box, used to accommodate battery cells;

[0006] The liquid cooling structure is assembled on the battery box, and at least part of the side wall of the battery cell abuts against the liquid cooling structure. The liquid cooling structure includes a liquid cooling plate and a guide part. The guide part is connected to one end of the liquid cooling plate. The liquid cooling plate is provided with a plurality of liquid inlet channels and a plurality of liquid return channels. The guide part is provided with a plurality of connecting channels. The plurality of liquid inlet channels are connected to the plurality of connecting channels in a one-to-one correspondence, and the plurality of liquid return channels are connected to the plurality of connecting channels in a one-to-one correspondence.

[0007] The battery device adopts a liquid cooling structure for circulating the cooling liquid, and the liquid cooling structure is arranged against at least part of the side wall of the battery cell, so that the circulating cooling liquid can take away the heat generated by the battery cell during charging and discharging, thereby achieving the purpose of heat dissipation and cooling. In the liquid cooling structure of the battery device, the liquid cooling structure includes a liquid cooling plate and a guide part connected to one end of the liquid cooling plate, the liquid cooling plate is provided with a plurality of liquid inlet channels and a plurality of liquid return channels, the guide part is provided with a plurality of connecting channels, wherein the plurality of liquid inlet channels are connected to the plurality of liquid return channels in a one-to-one correspondence through the plurality of connecting channels. In other words, each liquid inlet channel is independently connected to the corresponding liquid return channel through the corresponding connecting channel of the guide part, and the cooling liquid no longer converges when it flows to the end in each liquid inlet channel, but is directed through the connecting channel of the guide part and flows into the corresponding liquid return channel. This can reduce the possibility of coolant generating eddy currents when it converges and swirls between the inlet flow channel and the return flow channel, thereby reducing the possibility of coolant generating abnormal noise when it converges and swirls, which helps to improve the overall quietness performance of the battery device.

[0008] In some embodiments of the present application, multiple liquid inlet channels and multiple liquid return channels are symmetrically arranged relative to the middle dividing plane of the liquid cooling plate along its length direction. The structural design of the guide part of the multiple connecting channels stacked in a stepped manner is simplified, which reduces the difficulty of designing and manufacturing the guide part, improves production efficiency, and improves assembly efficiency.

[0009] In some embodiments of the present application, multiple liquid inlet channels and multiple liquid return channels are arranged alternately in sequence along the width direction of the liquid cooling plate. In this way, the heat exchange efficiency of the heat exchange between the entire liquid cooling plate and the battery cells tends to be average, and the heat dissipation and cooling effect of all battery cells is basically the same, avoiding the temperature of the battery cells cooled by the coolant flowing through the liquid inlet channel being lower than the temperature of the battery cells cooled by the coolant flowing through the liquid return channel.

[0010] In some embodiments of the present application, along the length direction of the liquid cooling plate, the plurality of liquid inlet channels and the plurality of liquid return channels are all straight channels. The straight channel liquid inlet channel can reduce the flow resistance during the flow of the coolant, so that the coolant flows smoothly, thereby maintaining the heat exchange efficiency of the heat exchange with the battery cells.

[0011] In some embodiments of the present application, along the width direction of the liquid cooling plate, multiple connecting flow channels are straight flow channels, so that the coolant can flow quickly from the liquid inlet flow channel into the liquid return flow channel; or, multiple connecting flow channels are arc-shaped flow channels, which can reduce the situation where the coolant converges and rotates between the liquid inlet flow channel and the liquid return flow channel to generate vortices, thereby reducing the possibility of abnormal noise generated by the coolant when converging and rotating.

[0012] In some embodiments of the present application, the liquid cooling plate is further provided with a liquid inlet nozzle and a liquid outlet nozzle, the liquid inlet nozzle and the liquid outlet nozzle are located at the end of the liquid cooling plate opposite to the guide portion, the liquid inlets of multiple liquid inlet channels are all connected to the liquid inlet nozzle, the liquid outlets of multiple liquid return channels are all connected to the liquid outlet nozzle, and the liquid inlet nozzle and the liquid outlet nozzle are both penetrated through the battery box. By providing a liquid inlet nozzle and a liquid outlet nozzle, the coolant can enter and exit the liquid cooling structure and circulate in the liquid cooling structure, which saves the number of liquid inlet structures and liquid outlet structures required for the liquid cooling structure, reduces the cost of components, and also saves the assembly space required for the liquid inlet structure and the liquid outlet structure.

[0013] In some embodiments of the present application, the guide portion is welded to one end of the liquid cooling plate; or, the liquid cooling plate and the guide portion are an integrally formed component.

[0014] In some embodiments of the present application, the battery box includes a box body and a box cover, the box body includes a bottom plate and a circumferential enclosure plate arranged at the edge area of ​​the bottom plate, the box cover is covered with an end of the circumferential enclosure plate away from the bottom plate to form an assembly space for accommodating battery cells, and the liquid cooling structure is arranged against the inner wall of the bottom plate. In this way, multiple battery cells are assembled into the assembly space in a positive assembly form.

[0015] In some embodiments of the present application, the battery box includes a box body and a box cover, the box body includes a bottom plate and a circumferential enclosure plate arranged at the edge area of ​​the bottom plate, the box cover is covered with an end of the circumferential enclosure plate away from the bottom plate to form an assembly space for accommodating battery cells, and the liquid cooling structure is arranged against the inner wall of the box cover. In this way, multiple battery cells are assembled into the assembly space in an inverted assembly form.

[0016] In some embodiments of the present application, the battery box includes a circumferential enclosure plate and a box cover, and the liquid cooling structure and the box cover are respectively arranged at both ends of the circumferential enclosure plate to form an assembly space for accommodating battery cells. When the outer dimensions of the battery box remain unchanged, the assembly space volume is increased, and a larger volume of battery cells can be assembled, thereby improving the battery energy density of the battery device.

[0017] According to a second aspect of an embodiment of the present application, an energy storage device is provided, wherein the energy storage device comprises the battery device as described above.

[0018] According to a third aspect of an embodiment of the present application, an electrical device is provided. The electrical device includes an electrical load; and

[0019] The electrical equipment further comprises a plurality of battery devices as described above, and the battery devices are electrically connected to the electrical load;

[0020] Alternatively, the electrical equipment further comprises an energy storage device as described above, and the energy storage device is electrically connected to the electrical load. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 An exploded schematic diagram of a battery device according to an embodiment of the present application;

[0023] Figure 2 It is a schematic diagram of the assembly structure in which the liquid cooling structure in the battery device of the embodiment of the present application is arranged against the bottom plate of the battery box;

[0024] Figure 3 for Figure 2 A top view schematic diagram of

[0025] Figure 4 for Figure 3 Schematic diagram of the left side;

[0026] Figure 5 for Figure 3 Schematic diagram from top view;

[0027] Figure 6 for Figure 5 A schematic cross-sectional view along the AA direction, wherein the hollow arrows in the figure indicate the direction of liquid flow;

[0028] Figure 7 for Figure 6 The enlarged schematic diagram of point B in the middle;

[0029] Figure 8 This is a schematic structural diagram of a flow guide portion in a battery device according to an embodiment of the present application;

[0030] Fig. 9 A schematic diagram of the assembly structure of an energy storage device according to an embodiment of the present application;

[0031] Fig.10 This is a schematic diagram of the assembly structure of an electrical equipment according to an embodiment of the present application.

[0032] Among them, the reference numerals in the figures are:

[0033] 100. Battery cell;

[0034] 200. Battery device;

[0035] 210, battery box; 211, box body; 2111, bottom plate; 2112, circumferential enclosure plate; 212, box cover; 213, assembly space;

[0036] 220, liquid cooling structure; 221, liquid cooling plate; 2211, liquid inlet channel; 2212, liquid return channel; 2213, liquid inlet nozzle; 2214, liquid outlet nozzle; 222, flow guide; 2221, connecting channel; 2222, liquid inlet end; 2223, liquid outlet end;

[0037] 230, middle face;

[0038] 300, energy storage device; 301, cabinet;

[0039] 400, electrical equipment; 410, electrical load; 420, control device; 430, vehicle frame; 440, wheels. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0041] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] At present, judging from the development of the market situation, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations (battery devices for such applications are generally referred to as energy storage batteries), but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields (battery devices for such applications are generally referred to as power batteries). With the continuous expansion of the application fields of battery devices, users' requirements for the product quality of battery devices are also constantly increasing. Among them, the product quality requirements of battery devices include but are not limited to battery life requirements, battery working safety and reliability requirements, battery device miniaturization requirements, battery device working quietness requirements, etc.

[0045] Regarding the quietness requirements of battery devices, users hope that the battery devices can always maintain a quiet effect during the charging and discharging process, reduce the noise generated by the battery devices during the charging and discharging process as much as possible, and maintain a quiet effect at the site of use. However, since the battery device is equipped with many parts that assist the battery cells in completing the charging and discharging work, these parts will generate noise during operation, thereby affecting the overall quietness performance of the battery device. Among them, current battery devices all use liquid cooling plates to dissipate heat and cool down the battery cells that are performing charging and discharging work, and use circulating coolant to take away the heat generated by the battery cells during charging and discharging, so that the battery cells can always maintain a suitable operating temperature range for charging and discharging, reducing the thermal runaway caused by the high temperature generated by the battery cells during charging and discharging.

[0046] The liquid cooling plate of the battery device is provided with multiple liquid inlet channels and multiple liquid return channels. The coolant circulates in the liquid inlet channels and the liquid return channels, thereby taking away the heat generated by the battery cells during charging and discharging. During the circulation of the coolant, when the coolant flows to the end of the liquid inlet channel, the coolant in multiple liquid inlet channels will converge, and then the converged coolant will enter the liquid return channel through a swirling flow and continue to flow. When the coolant converges and swirls, the coolant will impact the inner wall of the channel to generate eddy currents, which will then cause abnormal noise. This will become the noise generated when the battery device is operating as a whole, affecting the overall quietness of the battery device and the user experience of the battery device.

[0047] Based on the above considerations, an embodiment of the present application provides a battery device capable of improving the overall quiet performance. The battery device adopts a liquid cooling structure for circulating cooling liquid, and the liquid cooling structure is arranged against at least part of the side wall of the battery cell (i.e., abuts against each other), so that the circulating cooling liquid can take away the heat generated by the battery cell during charging and discharging, thereby achieving the purpose of heat dissipation and cooling. In the liquid cooling structure of the battery device, the liquid cooling structure includes a liquid cooling plate and a guide part connected to one end of the liquid cooling plate, the liquid cooling plate is provided with a plurality of liquid inlet channels and a plurality of liquid return channels, the guide part is provided with a plurality of connecting channels, wherein the plurality of liquid inlet channels are connected to the plurality of liquid return channels in a one-to-one correspondence through the plurality of connecting channels. In other words, each liquid inlet channel is independently connected to the corresponding liquid return channel through the corresponding connecting channel of the guide part, and the cooling liquid no longer converges when it flows to the end in each liquid inlet channel, but is directed through the connecting channel of the guide part and flows into the corresponding liquid return channel. This can reduce the possibility of coolant generating eddy currents when it converges and swirls between the inlet flow channel and the return flow channel, thereby reducing the possibility of coolant generating abnormal noise when it converges and swirls, which helps to improve the overall quietness performance of the battery device.

[0048] In order to illustrate the technical solutions provided by the embodiments of the present application, the following is a detailed description with reference to specific drawings and embodiments.

[0049] like Figures 1 to 7 As shown, according to the first aspect of the embodiment of the present application, the embodiment of the present application provides a battery device 200. The battery device 200 includes a battery case 210, a liquid cooling structure 220 and a plurality of battery cells 100. The battery case 210 is used to accommodate a plurality of battery cells 100, the liquid cooling structure 220 is assembled on the battery case 210, the liquid cooling structure 220 is arranged in contact with at least part of the outer wall of the battery cell 100, the liquid cooling structure 220 includes a liquid cooling plate 221 and a guide 222, the guide 222 is connected to one end of the liquid cooling plate 221, the liquid cooling plate 221 is provided with a plurality of liquid inlet channels 2211 and a plurality of liquid return channels 2212, the guide 222 is provided with a plurality of connecting channels 2221, the plurality of liquid inlet channels 2211 are connected to the plurality of connecting channels 2221 in a one-to-one correspondence, and the plurality of liquid return channels 2212 are connected to the plurality of connecting channels 2221 in a one-to-one correspondence.

[0050] The battery device 200 adopts a liquid cooling structure 220 for circulating cooling liquid, and when the liquid cooling structure 220 and a plurality of battery cells 100 are assembled in a battery box 210, the liquid cooling structure 220 is arranged close to at least part of the side wall of the battery cell 100, so that the circulating cooling liquid can take away the heat generated by the battery cell 100 during charging and discharging, thereby achieving the purpose of heat dissipation and temperature reduction. In the liquid cooling structure 220 of the battery device 200, the liquid cooling structure 220 includes a liquid cooling plate 221 and a guide portion 222 connected to one end of the liquid cooling plate 221, the liquid cooling plate 221 is provided with a plurality of liquid inlet channels 2211 and a plurality of liquid return channels 2212, and the guide portion 222 is provided with a plurality of connecting channels 2221, wherein the plurality of liquid inlet channels 2211 and the plurality of liquid return channels 2212 are connected in a one-to-one correspondence through the plurality of connecting channels 2221. That is to say, each liquid inlet flow channel 2211 is independently connected to the corresponding liquid return flow channel 2212 through the corresponding connecting flow channel 2221 of the guide part 222. When the coolant flows to the end in each liquid inlet flow channel 2211, it no longer converges, but is directed through the connecting flow channel 2221 of the guide part 222 and flows into the corresponding liquid return flow channel 2212. Figure 6 The hollow arrows show the flow path of the coolant in the independent circulation channel formed by each inlet channel 2211, the corresponding connecting channel 2221 and the corresponding return channel 2212. This can reduce the possibility of the coolant generating eddy currents when converging and rotating between the inlet channel 2211 and the return channel 2212, thereby reducing the possibility of abnormal noise when the coolant converges and rotates, which helps to improve the overall quietness of the battery device 200.

[0051] In the battery device 200 of some embodiments of the present application, Figure 1As shown, the battery box 210 includes a box body 211 and a box cover 212, the box cover 212 covers the open end of the box body 211, and the box body 211 and the box cover 212 cover to form an assembly space 213, and a plurality of battery cells 100 are assembled in an array and distributed in the assembly space 213, and a liquid cooling structure 220 is arranged in the assembly space 213, and at least part of the side wall of the battery cell 100 abuts against the liquid cooling structure 220, so that the liquid cooling structure 220 can perform heat exchange on the battery cell 100. Among them, the battery cell 100 is used to store electrical energy or supply power, that is, the battery cell 100 is used for charging when storing electrical energy, and the battery cell 100 is used for discharging when supplying power. In addition, the battery cell 100 can be a secondary battery, which refers to a battery cell 100 that can be used continuously by activating the active material by charging after the battery cell 100 is discharged. The battery cell 100 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0052] In some embodiments of the present application, Figure 6 and Figure 7 As shown, with respect to the center dividing plane 230 of the liquid cooling plate 221 along its length direction, a plurality of liquid inlet channels 2211 and a plurality of liquid return channels 2212 are symmetrically arranged. The center dividing plane 230 refers to a geometric plane perpendicular to the plate surface of the liquid cooling plate 221, which divides the liquid cooling plate 221 into two parts, and the distances from the two sides of the plate surface of the two parts away from the plane to the plane are equal, that is, the two sides are parallel to the plane. When the guide part 222 is assembled with the liquid cooling plate 221, as shown in FIG. Figures 6 to 8 As shown, the liquid outlets of the plurality of liquid inlet channels 2211 are connected to the liquid inlet ends 2222 of the plurality of communication channels 2221 in a one-to-one correspondence, and the liquid inlets of the plurality of liquid return channels 2212 are connected to the liquid outlet ends 2223 of the plurality of communication channels 2221 in a one-to-one correspondence. Figure 7 and Figure 8As shown, since the multiple liquid inlet channels 2211 and the multiple liquid return channels 2212 are symmetrically arranged relative to the center dividing plane 230, the multiple connecting channels 2221 of the guide portion 222 only need to be stacked in a stepped manner, so that the liquid inlet end 2222 and the liquid outlet end 2223 of each connecting channel 2221 can be respectively connected and connected with the corresponding liquid inlet channel 2211 and the corresponding liquid return channel 2212, so that each liquid inlet channel 2211, the corresponding connecting channel 2221 and the corresponding liquid return channel 2212 form an independent circulation channel, and the connecting channel 2221 of the guide portion 222 directs the coolant, thereby reducing the situation where the coolant converges and rotates between the liquid inlet channel 2211 and the liquid return channel 2212 to generate vortices, and reducing the possibility of abnormal noise generated by the coolant when converging and rotating. Furthermore, the structural design of the guide portion 222 of the plurality of communicating flow channels 2221 stacked in a stepped manner is simplified, which reduces the difficulty of designing and manufacturing the guide portion 222, improves production efficiency, and improves assembly efficiency.

[0053] In order to improve the heat dissipation and cooling efficiency of the liquid cooling structure 220 on the battery cell 100, in some embodiments of the present application, along the width direction of the liquid cooling plate 221, multiple liquid inlet channels 2211 and multiple liquid return channels 2212 are arranged alternately in sequence. During the process of the coolant flowing in the independent circulation channel formed by each liquid inlet channel 2211, the corresponding connecting channel 2221 and the corresponding liquid return channel 2212, the temperature of the coolant is continuously increased, that is, the coolant has the lowest temperature when it flows into the liquid inlet channel 2211. As the coolant flows and continuously exchanges heat with the battery cell 100, the temperature of the coolant continues to increase until the coolant flows through the liquid return channel 2212 and flows out of the liquid cooling structure 220. Therefore, the heat exchange efficiency of the coolant flowing in the liquid inlet channel 2211 and exchanging heat with the battery cell 100 is higher than the heat exchange efficiency of the coolant flowing in the liquid return channel 2212 and exchanging heat with the battery cell 100. In this embodiment, multiple liquid inlet channels 2211 and multiple liquid return channels 2212 are alternately arranged in sequence along the width direction of the liquid cooling plate 221, so that the heat exchange efficiency of the heat exchange between the entire liquid cooling plate 221 and the battery cells 100 tends to be averaged, and the heat dissipation and cooling effects of all battery cells 100 are basically the same, thereby avoiding the temperature of the battery cells 100 cooled by the coolant flowing through the liquid inlet channel 2211 being lower than the temperature of the battery cells 100 cooled by the coolant flowing through the liquid return channel 2212, thereby avoiding the situation where the battery device 200 as a whole has a local high temperature.

[0054] like Figure 6 and Figure 7As shown, in some embodiments of the present application, along the length direction of the liquid cooling plate 221, multiple liquid inlet channels 2211 and multiple liquid return channels 2212 are all straight channels. The liquid inlet channel 2211 of the straight channel and the liquid return channel 2212 of the straight channel make the coolant flow in a straight-through state, reduce the flow resistance during the flow of the coolant, and make the coolant flow smoothly, thereby maintaining the heat exchange efficiency of the heat exchange with the battery cell 100. In addition, the flow resistance encountered by the coolant in the liquid inlet channel 2211 and the liquid return channel 2212 is reduced, thereby reducing the probability of eddy currents generated by the coolant in the liquid inlet channel 2211 and the liquid return channel 2212, and then reducing the abnormal noise generated by the coolant in the liquid inlet channel 2211 and the liquid return channel 2212, which helps to improve the overall quiet performance of the battery device 200.

[0055] like Figure 7 and Figure 8 As shown, in some embodiments of the present application, along the width direction of the liquid cooling plate 221, multiple connecting channels 2221 are all straight channels. The corresponding liquid inlet channel 2211 and the liquid return channel 2212 are connected to form an independent circulation channel through the connecting channel 2221 of the straight channel, so that the coolant no longer converges when it flows to the end in each liquid inlet channel 2211, but is directed through the connecting channel 2221 of the guide part 222 and flows into the corresponding liquid return channel 2212. In this way, the coolant can be reduced to converge between the liquid inlet channel 2211 and the liquid return channel 2212 and swirl to generate eddy currents, thereby reducing the possibility of abnormal noise generated by the coolant when converging and swirling. In addition, the straight line between two points is the shortest, and the connecting channel 2221 of the straight channel enables the coolant to quickly flow from the liquid inlet channel 2211 into the liquid return channel 2212. Moreover, multiple liquid inlet channels 2211 and multiple liquid return channels 2212 are all straight channels along the length direction of the liquid cooling plate 221, and multiple connecting channels 2221 are all straight channels along the width direction of the liquid cooling plate 221. In this way, the coolant flows in the entire area covered by the liquid cooling structure 220. In other words, as long as the battery cell 100 contacts the liquid cooling structure 220, the liquid cooling structure 220 can perform heat exchange on the battery cell 100, thereby achieving heat dissipation and cooling of the battery cell 100, thereby improving the overall heat dissipation and cooling capacity of the battery device 200.

[0056] In some embodiments of the present application, the plurality of connecting flow channels 2221 are all arc-shaped flow channels. The corresponding liquid inlet flow channel 2211 and the liquid return flow channel 2212 are connected through the connecting flow channel 2221 of the arc-shaped flow channel to form an independent circulation flow channel. In the process that the coolant flows from the liquid inlet flow channel 2211 into the connecting flow channel 2221 of the arc-shaped flow channel, the coolant flows in the connecting flow channel 2221 of the arc-shaped flow channel, and the coolant is guided through the connecting flow channel 2221 of the arc-shaped flow channel and flows back and forth into the liquid return flow channel 2212, the connecting flow channel 2221 of the arc-shaped flow channel can reduce the flow resistance of the coolant, so that the coolant can reduce the eddy current generated by the confluence and rotation flow between the liquid inlet flow channel 2211 and the liquid return flow channel 2212, thereby reducing the possibility of abnormal noise generated by the coolant when converging and rotating.

[0057] like Figures 3 to 6 As shown, in some embodiments of the present application, the liquid cooling plate 221 is further provided with a liquid inlet nozzle 2213 and a liquid outlet nozzle 2214, the liquid inlet nozzle 2213 and the liquid outlet nozzle 2214 are located at the end of the liquid cooling plate 221 opposite to the guide portion 222, the liquid inlets of the plurality of liquid inlet channels 2211 are all connected to the liquid inlet nozzle 2213, the liquid outlets of the plurality of liquid return channels 2212 are all connected to the liquid outlet nozzle 2214, and the liquid inlet nozzle 2213 and the liquid outlet nozzle 2214 are both penetrated in the battery box 210. The cooling liquid flows in from the liquid inlet nozzle 2213, and then is divided into the plurality of liquid inlet channels 2211, and flows to the connecting channel 2221 and the liquid return channel 2212, and the cooling liquid exchanges heat with the battery cell 100 during the flow process, thereby achieving the purpose of heat dissipation and cooling of the battery cell 100. Furthermore, the coolant flows through a plurality of return channels 2212 and then converges and flows out from the liquid outlet 2214. By providing a liquid inlet 2213 and a liquid outlet 2214, the coolant can enter and exit the liquid cooling structure 220 and circulate in the liquid cooling structure 220, thereby saving the number of liquid inlet structures and liquid outlet structures required for the liquid cooling structure 220, reducing the cost of components and also saving the assembly space required for the liquid inlet structure and the liquid outlet structure.

[0058] In other embodiments of the present application, the liquid cooling plate 221 may also be provided with a plurality of liquid inlet nozzles 2213 and a plurality of liquid outlet nozzles 2214, wherein the plurality of liquid inlet nozzles 2213 are connected one-to-one with the plurality of liquid inlet channels 2211, and the plurality of liquid outlet nozzles 2214 are connected one-to-one with the plurality of liquid return channels 2212. In this way, an inlet nozzle 2213, an inlet channel 2211, a connecting channel 2221 and a liquid return channel 2212 form an independent circulation channel, and the coolant flows in each independent circulation channel without interfering with each other, thereby reducing the frequency of vortex formation by the coolant and reducing the occurrence of abnormal noise by the coolant.

[0059] In some embodiments of the present application, the guide portion 222 is welded to one end of the liquid cooling plate 221. In this embodiment, the liquid cooling plate 221 and the guide portion 222 are separately manufactured and formed, and then the two are welded to form a liquid cooling structure 220. When manufacturing the guide portion 222, the connecting flow channel 2221 is first extruded by extruding a profile, and then the final guide portion 222 product is formed by CNC machining. Then, the guide portion 222 is welded to the liquid cooling plate 221.

[0060] In other embodiments of the present application, the liquid cooling plate 221 and the guide part 222 are integrally formed components. For example, the liquid cooling structure 220 is cast by a casting process, so that the liquid cooling plate 221 and the guide part 222 are integrally formed, thereby avoiding leakage at the joint between the liquid cooling plate 221 and the guide part 222 due to subsequent assembly.

[0061] In some embodiments of the present application, Figures 1 to 3 As shown, the box body 211 includes a bottom plate 2111 and a circumferential enclosure plate 2112 disposed at the edge area of ​​the bottom plate 2111, and the box cover 212 covers one end of the circumferential enclosure plate 2112 away from the bottom plate 2111 (i.e., the open end formed by the circumferential enclosure plate 2112) to form an assembly space 213 for accommodating the battery cell 100, and the liquid cooling structure 220 is disposed against the inner wall of the bottom plate 2111. In this embodiment, a plurality of battery cells 100 are assembled into the assembly space 213 in a positive assembly form, the bottom of the battery cell 100 abuts against the liquid cooling structure 220, and the top of the battery cell 100 faces the box cover 212. In the embodiment of the present application, the battery cell 100 is a single-sided output electrode, that is, one end face of the output electrode is the top of the battery cell 100, and the end face opposite to the top is the bottom of the battery cell 100. The battery cells 100 are assembled in a positive assembly manner. When multiple battery cells 100 are connected in series, in parallel or in mixed connection using a bar, the connection can be completed conveniently and quickly, thereby improving the assembly efficiency. Finally, the box cover 212 is closed.

[0062] In other embodiments of the present application, the box body 211 includes a bottom plate 2111 and a circumferential enclosure plate 2112 disposed at the edge of the bottom plate 2111, the box cover 212 covers one end of the circumferential enclosure plate 2112 away from the bottom plate 2111 to form an assembly space 213 for accommodating the battery cell 100, and the liquid cooling structure 220 is disposed against the inner wall of the box cover 212. In the embodiment of the present application, the battery cell 100 is a single-sided output electrode, that is, one end face of the output electrode is the top of the battery cell 100, and the end face opposite to the top is the bottom of the battery cell 100. When the battery cells 100 are assembled in an inverted manner, a plurality of battery cells 100 are first arranged, and then the plurality of battery cells 100 are connected in series, in parallel or in a mixed manner using a bar sheet to form an integral module. The integral module formed by the series, parallel or mixed arrangement is then assembled into the assembly space 213. At this time, the top of the battery cell 100 faces the bottom plate 2111, and the bottom of the battery cell 100 faces the box cover 212. Finally, the box cover 212 is closed.

[0063] In some other embodiments of the present application, the battery case 210 includes a circumferential enclosure plate 2112 and a case cover 212, and the liquid cooling structure 220 and the case cover 212 are respectively arranged at both ends of the circumferential enclosure plate 2112 to form an assembly space 213 for accommodating the battery cell 100. That is to say, in this embodiment, the liquid cooling structure 220 is a part of the case body 211, that is, as the bottom plate of the case body 211 (that is, the liquid cooling structure 220 replaces the above-mentioned bottom plate 2111), thereby expanding the volume of the assembly space 213. When the outer dimensions of the battery case 210 remain unchanged, the volume of the assembly space 213 is increased, and a larger volume of battery cells 100 can be assembled, thereby improving the battery energy density of the battery device 200.

[0064] According to the second aspect of the embodiments of the present application, the embodiments of the present application further provide an energy storage device 300. In some embodiments, the energy storage device 300 includes the aforementioned battery device 200, that is, the energy storage device 300 uses one battery device 200 or multiple battery devices 200 in series, parallel or mixed connection, so that these battery devices 200 are used to store electrical energy or provide electrical energy.

[0065] The energy storage device 300 can be a small portable device, such as a portable energy storage battery used for outdoor travel and camping, or a portable energy storage battery used by street vendors. The energy storage device 300 can also be a large, fixed, high-power industrial-grade device, such as a large energy storage power station used by a power station, wherein the energy storage device 300 can be used for energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems, etc. The energy storage device 300 can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device 300 can store electrical energy when electricity consumption is low, and provide electrical energy to related users or electrical equipment during peak electricity consumption. Another example is an independent power supply energy storage cabinet or energy storage container used on a construction site or in a factory, or a larger, movable energy storage cabinet or energy storage container used at a large event site.

[0066] like Fig. 9 As shown, the energy storage device 300 is an energy storage cabinet, including a cabinet body 301 and a plurality of battery devices 200 , and the plurality of battery devices 200 are stacked and assembled in the cabinet body 301 .

[0067] In some embodiments, the energy storage device 300 may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0068] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for adjusting the temperature of the battery cells 100 to each battery cell 100 or each battery device 200 through a pipeline.

[0069] As an example, the main control module can be used as a battery management unit for multiple battery cells 100 or multiple battery devices 200 to monitor and manage multiple battery cells 100 or multiple battery devices 200. The main control module can monitor the current, voltage, power or temperature of multiple battery cells 100 or multiple battery devices 200. For example, the charge and discharge current, voltage, etc. of multiple battery cells 100 or multiple battery devices 200 can be controlled. The main control module includes a slave battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch and other modules.

[0070] As an example, the master control module can be used as a battery management unit of the energy storage device 300 to monitor and manage the energy storage device 300. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device 300. For example, the charging and discharging current and voltage of the energy storage device 300 can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module.

[0071] As an example, the fire protection module includes a control panel, a detector, an alarm device, etc., which are used to detect, alarm or extinguish fire in the energy storage system.

[0072] As an example, the power distribution module may be used to distribute power to modules in the energy storage device 300 that require power.

[0073] According to a third aspect of the embodiments of the present application, the embodiments of the present application further provide an electrical device 400 , which includes an electrical load 410 .

[0074] The electrical equipment 400 includes, but is not limited to, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, the electric toys may include, but are not limited to, fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. The spacecraft may include, but are not limited to, airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] In some embodiments of the present application, the electrical device 400 further includes the aforementioned energy storage device 300, that is, the electrical device 400 uses one energy storage device 300 or multiple energy storage devices 300 in series, parallel or hybrid connection. The energy storage device 300 is used to store electrical energy or to provide electrical energy to the electrical load 410, so that the electrical load 410 can operate normally.

[0076] Alternatively, in some other embodiments of the present application, the electrical device 400 further includes the aforementioned battery device 200, that is, the electrical device 400 uses one battery device 200 or multiple battery devices 200 connected in series, in parallel, or in mixed connection. The battery device 200 is used to store electrical energy or to provide electrical energy to the electrical load 410, so that the electrical load 410 operates normally.

[0077] The electric device 400 is an electric car, and is assembled with the battery device 200. Fig.10As shown, the battery device 200 is installed on the frame 430 of the electric vehicle. The electric vehicle includes a frame 430, a drive motor and a wheel 440. The battery device 200 and the drive motor are fixedly installed on the frame 430, and the wheel 440 is rotatably connected to the frame 430. In addition, the battery device 200 is electrically connected to the drive motor, and the drive motor is drivingly connected to the wheel 440. When the battery device 200 provided in the present application is used as a drive motor (the power supply drive motor is one of the power loads 410 of the power-consuming device 400), the drive motor drives the wheel 440 to rotate, so that the electric vehicle can travel normally. In addition, the electric vehicle includes a control device 420, which is installed on the frame 430, and the control device 420 is electrically connected to the battery device 200. The control device 420 is used to control and monitor the charging and discharging working state of the battery device 200. In some electric vehicles, the battery box of the battery device 200 can be used as a part of the chassis structure of the electric vehicle. For example, part of the battery box may become at least a part of the floor of the electric vehicle, or part of the battery box may become at least a part of the cross beam and the longitudinal beam of the electric vehicle.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery box, used to accommodate battery cells; A liquid cooling structure is assembled on the battery case, and at least part of the side wall of the battery cell abuts against the liquid cooling structure. The liquid cooling structure includes a liquid cooling plate and a guide portion. The guide portion is connected to one end of the liquid cooling plate. The liquid cooling plate is provided with a plurality of liquid inlet channels and a plurality of liquid return channels. The guide portion is provided with a plurality of connecting channels. The plurality of liquid inlet channels are connected to the plurality of connecting channels in a one-to-one correspondence, and the plurality of liquid return channels are connected to the plurality of connecting channels in a one-to-one correspondence.

2. The battery device according to claim 1, characterized in that: With respect to a center dividing plane of the liquid cooling plate along its length direction, the plurality of liquid inlet flow channels and the plurality of liquid return flow channels are symmetrically arranged.

3. The battery device according to claim 1, characterized in that: Along the width direction of the liquid cooling plate, the plurality of liquid inlet channels and the plurality of liquid return channels are alternately arranged in sequence.

4. The battery device according to claim 2 or 3, characterized in that: Along the length direction of the liquid cooling plate, the plurality of liquid inlet flow channels and the plurality of liquid return flow channels are all straight flow channels.

5. The battery device according to claim 4, characterized in that: Along the width direction of the liquid cooling plate, the plurality of communicating flow channels are all straight flow channels; Alternatively, the plurality of connecting flow channels are all arc-shaped flow channels.

6. The battery device according to claim 2 or 3, characterized in that: The liquid cooling plate is also provided with a liquid inlet nozzle and a liquid outlet nozzle, the liquid inlet nozzle and the liquid outlet nozzle are located at the end of the liquid cooling plate opposite to the guide portion, the liquid inlets of the plurality of liquid inlet channels are connected to the liquid inlet nozzle, the liquid outlets of the plurality of liquid return channels are connected to the liquid outlet nozzle, and the liquid inlet nozzle and the liquid outlet nozzle are both penetrated through the battery box.

7. The battery device according to claim 1, characterized in that: The guide portion is welded to one end of the liquid cooling plate; Alternatively, the liquid cooling plate and the air guide portion are integrally formed components.

8. The battery device according to claim 1, characterized in that: The battery box includes a box body and a box cover, the box body includes a bottom plate and a circumferential panel arranged in the edge area of ​​the bottom plate, the box cover is covered on one end of the circumferential panel away from the bottom plate to form an assembly space for accommodating the battery cells, and the liquid cooling structure is arranged against the inner wall of the bottom plate or the inner wall of the box cover.

9. The battery device according to claim 1, characterized in that: The battery box body includes a circumferential enclosure plate and a box cover. The liquid cooling structure and the box cover are respectively arranged at two ends of the circumferential enclosure plate to form an assembly space for accommodating the battery monomer.

10. An energy storage device, characterized in that: Comprising the battery device according to any one of claims 1 to 9.

11. An electrical device, characterized in that: Including electrical load; The electrical equipment further comprises a plurality of battery devices as claimed in any one of claims 1 to 9, wherein the battery devices are electrically connected to the electrical load; Alternatively, the electrical equipment further comprises an energy storage device as claimed in claim 10, and the energy storage device is electrically connected to the electrical load.

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