Battery device, energy storage system and electric equipment

Abstract

The invention relates to the technical field of batteries, in particular to a battery device, an energy storage system and electric equipment. According to the embodiment of the invention, when the liquid in the flow guide cavity is in contact with the bottom side of the battery monomer, the liquid can be forced to enter the flow guide channel through the inlet of the flow guide channel, and heat management is carried out on the battery monomer. In the process, the opening of the flow guide cavity is directly matched with the battery monomer, so that the liquid in the flow guide cavity can be directly contacted with the bottom side of the battery monomer, the contact area of the liquid and the battery monomer is increased, and the thermal management effect can be improved. Meanwhile, the fluid channel forcing the liquid to enter and flow out of the diversion channel through the inlet of the diversion channel is formed, so that the liquid can be better attached to the side surface of the cavity wall of the diversion channel formed by the battery monomers, the heat exchange between the liquid and the battery monomers is facilitated, and the heat management effect is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery devices, energy storage systems and electrical equipment. Background Art

[0002] Batteries are widely used in energy storage systems or electrical equipment, and the energy density requirements for batteries are getting higher and higher, which leads to higher and higher heat generation during operation. Therefore, it is necessary to improve the thermal management effect of batteries. Summary of the invention

[0003] Based on this, it is necessary to provide a battery device, an energy storage system and an electrical device to improve the thermal management effect of the battery.

[0004] According to one aspect of the present application, an embodiment of the present application provides a battery device, comprising: a plurality of battery cells, arranged at least along a first direction, a guide channel being defined between two battery cells adjacent to each other along the first direction, the bottom sides of the two battery cells defining an inlet of the guide channel, and the top sides of the two battery cells defining an outlet of the guide channel; and a wall structure, having a guide cavity, at least part of which is arranged on the bottom sides of the plurality of battery cells; the guide cavity having a liquid inlet and an opening arranged toward the plurality of battery cells; wherein the plurality of battery cells and the wall structure are matched so that the inlet of the guide channel is connected to the opening, and define a fluid channel that can force the liquid flowing into the guide cavity to flow into the guide channel through the opening.

[0005] In some embodiments, the wall structure further has a liquid inlet channel, the outlet of the liquid inlet channel is connected to the liquid inlet port; the inlet of the liquid inlet channel and the liquid inlet port are located on opposite sides of the plurality of battery cells.

[0006] In some embodiments, the plurality of battery cells have a first side and a second side disposed opposite to each other along a first direction; the inlet of the liquid inlet channel is located on the first side, and the liquid inlet port is located on the second side.

[0007] In some embodiments, at least one liquid inlet channel is provided; a plurality of guide cavities are provided; all guide cavities are arranged along the second direction; along the second direction, a liquid inlet channel is provided between at least two adjacent guide cavities; and the liquid inlets of the two adjacent guide cavities are connected to the outlet of the liquid inlet channel provided between the two adjacent guide cavities; the direction from the bottom side of the battery cell to the top side of the battery cell, the first direction, and the second direction intersect each other.

[0008] In some embodiments, the liquid inlet channel is longitudinally extended along the first direction.

[0009] In some embodiments, the multiple battery cells are arranged into at least one row along the second direction; each row of battery cells is correspondingly arranged with at least one diversion cavity; the inlet of the diversion channel defined by each row of battery cells is connected to the opening of the corresponding diversion cavity; the direction from the bottom side of the battery cell to the top side of the battery cell, the first direction and the second direction intersect each other.

[0010] In some embodiments, the opening is arranged on the bottom side of the multiple battery cells, and the orthographic projection of the opening on the reference plane is located within the range of the orthographic projection of the multiple battery cells on the reference plane; the reference plane is a plane perpendicular to the bottom side of the battery cell pointing to the top side of the battery cell.

[0011] In some embodiments, the wall structure includes a first body and a second body connected to each other; the first body includes at least a bottom wall, the bottom wall and the second body are arranged in a direction from the bottom side of the battery cell to the top side of the battery cell, and the first body and the second body define a flow guide cavity; the second body has a bearing surface arranged toward the multiple battery cells, and the bearing surface bears the multiple battery cells.

[0012] In some embodiments, the multiple battery cells have a first side and a second side arranged opposite to each other along a first direction; the second body includes at least three bearing parts arranged at intervals along the second direction, and the bearing parts extend from the first side to the second side; all the bearing parts and the first body define a plurality of guide cavities; a side surface of all the bearing parts facing the multiple battery cells constitutes at least a part of the bearing surface; the bottom side of the battery cell points to the direction of the top side of the battery cell, the first direction and the second direction intersect each other.

[0013] In some embodiments, the second body also includes a first connecting portion and a second connecting portion arranged opposite to each other along the first direction; one end of all the bearing portions along the second direction is connected to the first connecting portion, and the other end of all the bearing portions along the second direction is connected to the second connecting portion to define a plurality of flow guide cavities; a side surface of the first connecting portion, the second connecting portion and all the bearing portions facing the plurality of battery cells constitutes a bearing surface.

[0014] In some embodiments, among all the bearing parts, except the first bearing part and the last bearing part arranged along the second direction, the bearing parts are target parts; at least one target part is provided with a liquid inlet channel, and the outlet of the liquid inlet channel is connected to the liquid inlet of the corresponding guide cavity; the guide cavity corresponding to the liquid inlet channel is the guide cavity on both sides of the target part with the liquid inlet channel in the second direction.

[0015] In some embodiments, at least one supporting portion is configured as a bent portion and is connected to the bottom wall of the first body.

[0016] In some embodiments, a plurality of second bodies are provided, and all the second bodies are arranged along the second direction.

[0017] In some embodiments, the second body is an integrally formed piece.

[0018] In some embodiments, the battery device further includes a sealant disposed between the supporting surface and the plurality of battery cells.

[0019] In some embodiments, the wall structure also has a accommodating cavity, and the guide cavity and the multiple battery cells are all arranged in the accommodating cavity; a cache cavity is also defined between the wall structure and the multiple battery cells, and the cache cavity is at least arranged around the multiple battery cells, and the outlet of the cache cavity and the guide channel are connected; the battery device also includes a liquid outlet, and the interior of the liquid outlet is connected to the cache cavity.

[0020] In some embodiments, the battery device further includes a liquid inlet member, the outlet of which is communicated with the liquid inlet of the guide cavity; the liquid inlet member and the liquid outlet member are both arranged on the wall structure and located on the same side of the wall structure.

[0021] In some embodiments, the bottom side of the battery cell points toward the top side of the battery cell, and the outlet of the liquid outlet is located downstream of the inlet of the liquid inlet.

[0022] In some embodiments, large surfaces of two battery cells adjacent to each other along the first direction are arranged to face each other and define a flow guiding channel.

[0023] In some embodiments, the battery device further includes an isolating member; an isolating member is disposed between two battery cells adjacent to each other along the first direction to define a flow guiding channel.

[0024] In some embodiments, the battery device further includes an end plate; the end plates are respectively provided on both sides of the plurality of battery cells along the first direction, and a heat dissipation structure is provided on a side of the end plate away from the plurality of battery cells.

[0025] In some embodiments, the heat dissipation structure is configured as a heat dissipation fin.

[0026] In some embodiments, the heat dissipation structure is configured as a recessed portion disposed on a side of the end plate away from the plurality of battery cells.

[0027] According to another aspect of the present application, an embodiment of the present application provides an energy storage system, comprising the battery device in any of the above embodiments.

[0028] According to another aspect of the present application, an embodiment of the present application provides an electrical device, comprising the battery device in any of the above embodiments.

[0029] In the above-mentioned battery device, energy storage system and electrical equipment, the battery device at least includes a battery cell and a wall structure. By defining a flow guide channel between two battery cells adjacent to each other along a first direction, a flow guide cavity at least partially disposed on the bottom side of the battery cell is provided on the wall structure. Since the flow guide cavity has an opening connected to the inlet of the flow guide channel and the opening is disposed toward the battery cell, a fluid channel can be formed by matching a plurality of battery cells and the wall structure. Under such a fluid channel, when the liquid in the flow guide cavity contacts the bottom side of the battery cell, the liquid can be forced to enter the flow guide channel through the inlet of the flow guide channel, thereby performing thermal management on the battery cell. In this process, since the opening of the flow guide cavity directly matches the battery cell, the liquid in the flow guide cavity can directly contact the bottom side of the battery cell, thereby increasing the contact area between the liquid and the battery cell, thereby improving the thermal management effect. At the same time, since a fluid channel is formed that forces the liquid to enter and flow out of the guide channel through the inlet of the guide channel, the liquid can better fit the side of the cavity wall of the guide channel formed by the battery cell, which is beneficial to heat exchange between the liquid and the battery cell, and further beneficial to improving the thermal management effect.

[0030] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the embodiments below. The accompanying drawings are only for the purpose of illustrating the embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0032] Figure 1 is a schematic diagram of the three-dimensional structure of a battery device in some embodiments of the present application;

[0033] Figure 2 A schematic diagram of a three-dimensional structure of multiple battery cells in some embodiments of the present application;

[0034] Figure 3 Schematic diagram of the three-dimensional structure of multiple battery cells in other embodiments of the present application;

[0035] Figure 4 It is a schematic diagram of a three-dimensional structure of two adjacent battery cells cooperating with each other in some embodiments of the present application;

[0036] Figure 5 It is a schematic diagram of a three-dimensional structure of two adjacent battery cells cooperating with each other in some other embodiments of the present application;

[0037] Figure 6It is a schematic diagram of the three-dimensional structure of the wall structure in some embodiments of the present application;

[0038] Figure 7 It is a partial cross-sectional structural schematic diagram of the cooperation between the battery cell and the wall structure in some embodiments of the present application;

[0039] Figure 8 It is a partial cross-sectional structural schematic diagram of the matching of the battery cell and the wall structure in some other embodiments of the present application;

[0040] Fig. 9 for Figure 8 A schematic diagram of the structure shown in a state of use;

[0041] Fig.10 for Figure 8 A schematic diagram showing the structure shown in another state of use;

[0042] Fig.11 Schematic diagram of the three-dimensional structure of the wall structure in some other embodiments of the present application;

[0043] Fig.12 Schematic diagram of the three-dimensional structure of the wall structure in some other embodiments of the present application;

[0044] Fig.13 Schematic diagram of the three-dimensional structure of the battery device in some other embodiments of the present application;

[0045] Fig.14 Schematic diagram of the three-dimensional structure of the battery device in some other embodiments of the present application;

[0046] Fig.15 A schematic diagram of the projection relationship between a battery cell and an opening in some embodiments of the present application;

[0047] Fig.16 Schematic diagram of the projection relationship between the battery cell and the opening in some other embodiments of the present application;

[0048] Fig.17 It is a partial cross-sectional structural schematic diagram of the cooperation between the battery cell and the wall structure in some other embodiments of the present application;

[0049] Fig.18 Schematic diagram of the three-dimensional structure of a battery device in some other embodiments of the present application;

[0050] Fig.19 for Fig.18 A schematic cross-sectional structure diagram of;

[0051] Fig. 20 It is a schematic diagram of a three-dimensional structure of a part of the wall structure in some other embodiments of the present application;

[0052] Fig.21 for Fig. 20 A schematic diagram of a top view structure;

[0053] Fig. 22 This is a schematic diagram of the structure of the battery cell and the isolation member in some embodiments of the present application;

[0054] Fig.23 It is a schematic diagram of the structure of the battery cells and the isolation components in other embodiments of the present application;

[0055] Fig.24 This is a schematic diagram of a three-dimensional structure of a battery cell and an end plate in coordination with each other in some embodiments of the present application;

[0056] Fig.25 This is a schematic diagram of the three-dimensional structure of the end plate in some embodiments of the present application;

[0057] Fig.26 It is a schematic diagram of the structure of the battery cell and the supporting part in some embodiments of the present application;

[0058] Fig. 27 for Fig.26 Schematic diagram of the local enlarged structure at point A in the middle.

[0059] Description of reference numerals:

[0060] Battery device 100;

[0061] Battery cell 110, flow guiding channel p1, first side s1, second side s2, pressure relief mechanism X;

[0062] Wall structure 120, accommodating cavity Q, buffer cavity H, guide cavity D, liquid inlet w1, open port w2, liquid inlet channel p2, first body 121, bottom wall 1211, side wall 1212, top wall 1213, second body 122, bearing portion 1221, bearing surface m, first connecting portion 1222, second connecting portion 1223, target portion T, exhaust channel p3;

[0063] Seal 130;

[0064] Liquid outlet 140;

[0065] Liquid inlet 150;

[0066] End plate 160, heat dissipation structure R;

[0067] Isolation member G, convex portion U, spoiler structure V;

[0068] Reference surface E, first projection y1, second projection y2;

[0069] Coolant N;

[0070] The first direction F1, the second direction F2, and the third direction F3. DETAILED DESCRIPTION

[0071] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0072] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does 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 cannot be understood as a limitation on the present application.

[0073] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0075] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0077] According to some embodiments of this application, please refer to Figure 1 , Figure 1 1 is a schematic diagram of a three-dimensional structure of a battery device 100 in some embodiments of the present application. The present application provides a battery device 100 including a plurality of battery cells 110 and a wall structure 120. Figure 1 The plurality of battery cells 110 are briefly illustrated without being differentiated from each other.

[0078] The battery cell 110 refers to the smallest unit constituting the battery device 100. In the embodiment of the present application, the battery cell 110 may include a lithium-ion battery, a sodium-ion battery or a magnesium-ion battery device 100, etc., which is not limited in the embodiment of the present application. The battery cell 110 includes a housing, an electrode assembly and other functional components. The housing is a component for forming the internal environment of the battery cell 110. Among them, the formed internal environment can be used to accommodate the electrode assembly, the electrolyte and other components. Functional components such as electrode terminals and pressure relief mechanisms may be provided on the housing. The electrode terminal can be used to electrically connect to the electrode assembly for outputting or inputting the electrical energy of the battery cell 110. The pressure relief mechanism is used to release the internal pressure when the internal pressure or temperature of the battery cell 110 reaches a threshold value to improve the safety performance of the battery cell 110. The threshold design varies according to different design requirements. The housing may also be provided with a liquid injection hole for injecting electrolyte into the interior of the battery cell 110. The electrode assembly is a component in which an electrochemical reaction occurs in the battery cell 110. One or more electrode assemblies may be contained in the housing. The electrode assembly is mainly formed by stacking or winding the positive electrode sheet and the negative electrode sheet, and an isolation structure is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the pole ear. The positive pole ear and the negative pole ear can be located at one end of the main body or at both ends of the main body respectively, can be located at the top of the main body, or can be located at the side wall 1212 of the main body, and no specific restrictions are made here. During the charge and discharge process of the battery device 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear connects the electrode terminal to form a current loop. The isolation structure is used to isolate the positive electrode sheet and the negative electrode sheet, and prevent the electrons in the battery cell 110 from passing freely, allowing the ions in the electrolyte to flow freely between the positive electrode sheet and the negative electrode sheet. The isolation structure can be a thin film made of materials such as PE (polyethylene) and PP (polypropylene).

[0079] The plurality of battery cells 110 are arranged at least along the first direction F1. A flow guiding channel p1 is defined between two battery cells 110 adjacent to each other along the first direction F1. The bottom sides of the two battery cells 110 define an inlet of the flow guiding channel p1, and the top sides of the two battery cells 110 define an outlet of the flow guiding channel p1. Figure 4 and Figure 5 Let’s understand the diversion channel p1.

[0080] The arrangement of the plurality of battery cells 110 may be as follows: Figure 2 As shown, Figure 2is a schematic diagram of a three-dimensional structure of a plurality of battery cells 110 in some embodiments of the present application. All battery cells 110 are arranged along a first direction F1. Figure 3 As shown, Figure 3 Schematic diagram of the three-dimensional structure of multiple battery cells 110 in some other embodiments of the present application, all battery cells 110 are arranged along the first direction F1 and the second direction F2, which are not specifically limited here. The first direction F1 and the second direction F2 intersect each other.

[0081] The flow guiding channel p1 is a channel for guiding the flow of liquid and has an inlet and an outlet. The flow guiding channel p1 may be directly defined by two battery cells 110 adjacent to each other along the first direction F1, or may be defined by two battery cells 110 adjacent to each other along the first direction F1 with the aid of related components, and is not specifically limited here. Figure 4 For example, Figure 4 Schematic diagram of the three-dimensional structure of two adjacent battery cells 110 in some embodiments of the present application. Two isolation members G are arranged between two adjacent battery cells 110 along the first direction F1. The two isolation members G and the sides of the two battery cells 110 facing each other enclose and define a flow guide channel p1. Figure 5 For example, Figure 5 The schematic diagram of the three-dimensional structure of two adjacent battery cells 110 in other embodiments of the present application is a schematic diagram of the three-dimensional structure of two adjacent battery cells 110 in other embodiments of the present application. A convex portion U is provided on the side of the two adjacent battery cells 110 facing each other along the first direction F1. The side of the two adjacent battery cells 110 facing each other along the first direction F1 and the two convex portions U enclose and define a flow guide channel p1. The convex portion U and the shell of the corresponding battery cell 110 can be integrally formed.

[0082] The battery cell 110 has a bottom side and a top side that are arranged opposite to each other along the third direction F3. That is, the direction from the bottom side of the battery cell 110 to the top side of the battery cell 110 and the third direction F3 are parallel to each other. The first direction F1, the second direction F2 and the third direction F3 intersect each other. Figures 1 to 5 Taking the example, the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other. Since the bottom sides of the two battery cells 110 adjacent to each other along the first direction F1 define the inlet of the guide channel p1, and the top sides of the two battery cells 110 adjacent to each other along the first direction F1 define the outlet of the guide channel p1, that is, the inlet of the guide channel p1 and the outlet of the guide channel p1 are arranged opposite to each other along the third direction F3.

[0083] The wall structure 120 has a flow guiding cavity D, at least part of which is disposed on the bottom side of the plurality of battery cells 110. The flow guiding cavity D has a liquid inlet w1 and an opening w2 disposed toward the plurality of battery cells 110. The plurality of battery cells 110 and the wall structure 120 are matched so that the inlet of the flow guiding channel p1 is connected to the opening w2, and a fluid channel is defined that can force the liquid flowing into the flow guiding cavity D to flow into the flow guiding channel p1 through the opening w2.

[0084] Combined with reference Figure 6 , Figure 6 This is a schematic diagram of the three-dimensional structure of the wall structure 120 in some embodiments of the present application. The wall structure 120 is a structure that can play a role of separation, support, etc. The flow guide cavity D is a structure used to guide the flow of liquid, so that the liquid can be input from the liquid inlet w1 of the flow guide cavity D and output from the opening w2 of the flow guide cavity D. The opening w2 of the flow guide cavity D means that the opening w2 is in a state where it is not covered or closed by the wall structure 120. The multiple battery cells 110 and the wall structure 120 are matched, which means that the multiple battery cells 110 can be directly connected to the wall structure 120, or can be directly connected to the wall structure 120 with the help of related components, as long as the multiple battery cells 110 and the wall structure 120 can be matched.

[0085] For example, Figure 6 For example, the wall structure 120 mainly defines the flow guiding cavity D having the liquid inlet w1 and the open opening w2. Of course, the wall structure 120 can also be constructed to have a structure that can accommodate the multiple battery cells 110, which is not specifically limited here. Figure 6 For example, combined with reference Figure 7 and Figure 8 , Figure 7 1 is a partial cross-sectional structural diagram of the battery cell 110 and the wall structure 120 in some embodiments of the present application. Figure 8 The schematic diagram of the partial cross-sectional structure of the battery cells 110 and the wall structure 120 in other embodiments of the present application. When the multiple battery cells 110 and the wall structure 120 are matched, at least one of the following can be formed: Figure 7 and Figure 8 The structure shown in FIG. Figure 7 In the illustrated case, the plurality of battery cells 110 may be clamped at the opening w2. Figure 8 In the illustrated case, the plurality of battery cells 110 may be supported on the wall structure 120 , which is not specifically limited herein.

[0086] Continue with Figure 8 For example, combined with reference Fig. 9 and Fig.10 , Fig. 9 for Figure 8A schematic diagram of the structure shown in a state of use, Fig.10 for Figure 8 The schematic diagram of the structure shown in another use state, because the multiple battery cells 110 and the wall structure 120 are matched to define the aforementioned fluid channel, the coolant N entering the guide cavity D through the liquid inlet w1 of the guide cavity D can enter the guide channel p1 through the opening w2 of the guide cavity D, that is, it flows in from the bottom side of the multiple battery cells 110 and flows out from the top side of the multiple battery cells 110. Fig. 9 and Fig.10 In the figure, the flow direction of the coolant N is roughly indicated by arrows.

[0087] Thus, by defining a flow guide channel p1 between two battery cells 110 adjacent to each other along the first direction F1, a flow guide cavity D is provided on the wall structure 120, which is at least partially provided on the bottom side of the battery cell 110. Since the flow guide cavity D has an opening w2 connected to the inlet of the flow guide channel p1 and the opening w2 is provided toward the battery cell 110, a fluid channel can be formed by matching a plurality of battery cells 110 and the wall structure 120. Under such a fluid channel, when the liquid in the flow guide cavity D contacts the bottom side of the battery cell 110, the liquid can be forced to enter the flow guide channel p1 through the inlet of the flow guide channel p1, so as to perform thermal management on the battery cell 110. In this process, since the opening w2 of the flow guide cavity D directly matches the battery cell 110, the liquid in the flow guide cavity D can directly contact the bottom side of the battery cell 110, thereby increasing the contact area between the liquid and the battery cell 110, thereby improving the thermal management effect. At the same time, since a fluid channel is formed that forces the liquid to enter and flow out of the guide channel p1 through the inlet of the guide channel p1, the liquid can better fit the side of the cavity wall of the guide channel p1 formed by the battery cell 110, which is beneficial to heat exchange between the liquid and the battery cell 110, and further beneficial to improving the thermal management effect.

[0088] According to some embodiments of this application, please continue to refer to Figure 6 The wall structure 120 also has a liquid inlet channel p2, and the outlet of the liquid inlet channel p2 is connected to the liquid inlet w1. The inlet of the liquid inlet channel p2 and the liquid inlet w1 are located on opposite sides of the plurality of battery cells 110. Figure 6 In the illustrated perspective, the position of the liquid inlet channel p2 is indicated by a dotted line. It can be understood that the liquid inlet channel p2 is a channel provided in the wall structure 120 .

[0089] In this way, the liquid can be further buffered through the liquid inlet channel p2 before entering the liquid inlet w1, which is beneficial for the liquid to flow from the liquid inlet w1 into the guide cavity D in a more stable state, thereby helping to improve the stability of the fluid channel, and further helping the liquid to better fit the side of the cavity wall of the guide channel p1 formed by the battery cell 110, further improving the effect of heat exchange between the liquid and the battery cell 110.

[0090] Of course, in some other embodiments, the inlet of the liquid inlet channel p2 and the liquid inlet w1 may be located on two adjacent sides or on the same side of the plurality of battery cells 110 , which is not specifically limited herein.

[0091] According to some embodiments of this application, please continue to refer to Figure 1 , and combined with reference Figure 6 The plurality of battery cells 110 have a first side s1 and a second side s2 that are oppositely disposed along a first direction F1. The inlet of the liquid inlet channel p2 is located at the first side s1, and the liquid inlet w1 is located at the second side s2.

[0092] It should be noted that “the inlet of the liquid inlet channel p2 is located on the first side s1” and “the liquid inlet w1 is located on the second side s2” refer to the positions of the inlet of the liquid inlet channel p2 and the liquid inlet w1 relative to the multiple battery cells 110, and do not mean that the inlet of the liquid inlet channel p2 and the liquid inlet w1 are arranged on the multiple battery cells 110. The relevant parts of the first side s1 and the second side s2 involved in the following text can be understood by reference and will not be repeated.

[0093] Since the multiple battery cells 110 are arranged at least along the first direction F1, such an arrangement of the inlet of the liquid inlet channel p2 and the liquid inlet w1 of the guide cavity D can better utilize the space of the liquid inlet channel p2, help stabilize the liquid pressure in the fluid channel, and further reduce the impact of pressure fluctuations on liquid flow.

[0094] Of course, in some other embodiments, in combination with reference Figure 1 The inlet of the liquid inlet channel p2 and the liquid inlet w1 of the guide cavity D may be located at opposite sides of the plurality of battery cells 110 along the second direction F2, respectively, and no specific limitation is made herein.

[0095] According to some embodiments of this application, please refer to Fig.11 , Fig.11This is a schematic diagram of the three-dimensional structure of the wall structure 120 in some other embodiments of the present application, in which at least one liquid inlet channel p2 is provided. A plurality of guide chambers D are provided. All guide chambers D are arranged along the second direction F2. Along the second direction F2, a liquid inlet channel p2 is provided between at least two adjacent guide chambers D; and the liquid inlets w1 of the two adjacent guide chambers D are connected to the outlet of the liquid inlet channel p2 provided between the two adjacent guide chambers D. The bottom side of the battery cell 110 points to the direction of the top side of the battery cell 110, and the first direction F1 and the second direction F2 intersect each other. In the embodiment of the present application, Fig.11 For example, a direction from the bottom side of the battery cell 110 to the top side of the battery cell 110 and the third direction F3 are parallel to each other.

[0096] The liquid inlet channel p2 may be provided with one, two or other numbers, and the flow guide cavity D may be provided with two, three, four, five or other numbers, which are not specifically limited here. A liquid inlet channel p2 may be provided between every two adjacent flow guide cavities D along the second direction F2, or a liquid inlet channel p2 may be provided between two partially adjacent flow guide cavities D along the second direction F2, which are not specifically limited here.

[0097] For example, Fig.11 For example, there is one liquid inlet channel p2, two flow guide cavities D are provided, and along the second direction F2, the liquid inlet channel p2 is located between the two flow guide cavities D. Fig.12 For example, Fig.12 This is a schematic diagram of the three-dimensional structure of the wall structure 120 in some other embodiments of the present application, wherein two liquid inlet channels p2 are provided, and four guide chambers D are provided. Along the second direction F2, a liquid inlet channel p2 is provided between the first two adjacent guide chambers D, a liquid inlet channel p2 is provided between the last two adjacent guide chambers D, and no liquid inlet channel p2 is provided between the two adjacent guide chambers D in the middle.

[0098] In this way, not only can the liquid supply to the multiple flow guiding cavities D be realized within a limited space, but also the multiple battery cells 110 with different arrangements can be more flexibly arranged according to the multiple flow guiding cavities D.

[0099] Of course, in other embodiments, please continue to refer to Figure 6 There can be two liquid inlet channels p2 and one flow guide cavity D, and no specific limitation is made here.

[0100] According to some embodiments of this application, please continue to refer to Fig.12, along the second direction F2, two adjacent flow guiding cavities D constitute a flow guiding cavity group. There are multiple flow guiding cavity groups, and the flow guiding cavities D in all flow guiding cavity groups are different from each other. In the same flow guiding cavity group, a liquid inlet channel p2 is provided between two adjacent flow guiding cavities D, and the liquid inlets w1 of the two adjacent flow guiding cavities D are both connected to the outlet of the liquid inlet channel p2 provided between the two adjacent flow guiding cavities D.

[0101] Since the liquid inlet channel p2 is located between the corresponding two flow guiding cavities D, the liquid can be more evenly distributed to the flow guiding cavities D on both sides. In this way, when the liquid flows in the liquid inlet channel p2, the resistance of the flow guiding cavities D on both sides of the liquid inlet channel p2 is relatively balanced, so that the liquid flow rate entering the two flow guiding cavities D can be similar, so that the liquid entering the flow guiding channel p1 corresponding to the two flow guiding cavities D is more balanced and stable, which is further conducive to the liquid adhering to the side of the cavity wall of the flow guiding channel p1 formed by the battery cell 110 to cool the battery cell 110, and further improve the thermal management effect.

[0102] According to some embodiments of this application, please continue to refer to Figure 6 , Fig.11 and Fig.12 The liquid inlet channel p2 is longitudinally extended along the first direction F1, and the direction in which the inlet of the liquid inlet channel p2 points to the liquid inlet port w1 is parallel to the first direction F1.

[0103] This not only helps reduce liquid resistance, but also makes the design and installation of the liquid inlet channel p2 simpler and more direct, reduces the design difficulty and space occupation caused by the complex channel layout, and helps to achieve a compact design of the battery device 100.

[0104] Of course, in some other embodiments, the liquid inlet channel p2 can also be extended in a curved manner, and the direction in which the inlet of the liquid inlet channel p2 points to the liquid inlet w1 is parallel to the first direction F1. In this way, the liquid inlet channel p2 can be set longer, and the pressure fluctuation of the liquid can be further buffered. No specific limitation is made here.

[0105] According to some embodiments of this application, please continue to refer to Figure 1 , and combined with reference Fig.13 and Fig.14 , Fig.13 Schematic diagram of the three-dimensional structure of the battery device 100 in some other embodiments of the present application, Fig.14Schematic diagram of the three-dimensional structure of the battery device 100 in some embodiments of the present application, the multiple battery cells 110 are arranged in at least one row along the second direction F2. Each row of battery cells 110 is corresponding to at least one diversion cavity D. The inlet of the diversion channel p1 defined by each row of battery cells 110 is connected to the opening w2 of the corresponding diversion cavity D. The bottom side of the battery cell 110 points to the direction of the top side of the battery cell 110, the first direction F1 and the second direction F2 intersect each other. Fig.13 and Fig.14 A plurality of rows of battery cells 110 are briefly illustrated, and the battery cells 110 in each row are not distinguished and illustrated.

[0106] Among them, an inlet of the guide channel p1 is defined between every two adjacent battery cells 110 in each row of battery cells 110, and the inlet of the guide channel p1 defined by each row of battery cells 110 is composed of all "inlets of the guide channel p1 defined between every two adjacent battery cells 110".

[0107] For example, Figure 1 and Figure 6 The diagram shows a situation where a row of battery cells 110 is arranged corresponding to a flow guiding cavity D. Fig.11 and Fig.13 The diagram shows a situation where two rows of battery cells 110 are arranged in a one-to-one correspondence with two flow guide cavities D. Fig.12 and Fig.14 The diagram shows a situation where four rows of battery cells 110 are arranged in a one-to-one correspondence with four flow guiding cavities D. Of course, each row of battery cells 110 can also be arranged in a corresponding correspondence with two flow guiding cavities D, three flow guiding cavities D, or other numbers of flow guiding cavities D, which is not specifically limited here.

[0108] Since each row of battery cells 110 is provided with at least one guide cavity D, heat can be dissipated more effectively for each row of battery cells 110. At the same time, since the battery cells 110 are arranged in rows, the position and shape of the guide cavity D can be flexibly adjusted to achieve efficient use of space.

[0109] Of course, in some other embodiments, multiple rows of battery cells 110 may be arranged corresponding to one flow guiding cavity D, which is not specifically limited here.

[0110] According to some embodiments of this application, please continue to refer to Figures 11 to 14 The battery cells 110 are arranged in multiple rows, and the flow guiding cavities D are arranged in multiple rows, and all rows of battery cells 110 and all flow guiding cavities D are arranged in one-to-one correspondence.

[0111] Since all rows of battery cells 110 and all guide cavities D are arranged in one-to-one correspondence, fluid channels are defined for each row of battery cells 110 and the wall structure 120 respectively, and each fluid channel is relatively independent, which can effectively reduce the temperature imbalance caused by the difference in cooling effects of different rows of battery cells 110, thereby improving the consistency of the entire battery device 100, which is beneficial to improving the overall service life, charging and discharging efficiency and safety of the battery.

[0112] According to some embodiments of this application, please continue to refer to Figures 8 to 10 , and combined with reference Fig.15 The opening w2 is disposed on the bottom side of the battery cells 110 , and the orthographic projection of the opening w2 on the reference plane E is located within the range of the orthographic projection of the battery cells 110 on the reference plane E. The reference plane E is a plane perpendicular to the bottom side of the battery cell 110 and pointing to the top side of the battery cell 110 .

[0113] For example, Fig.15 For example, when a row of battery cells 110 is provided and one opening w2 is provided, the orthographic projection of the opening w2 on the reference plane E is the first projection y1, and the orthographic projection of the plurality of battery cells 110 on the reference plane E is the second projection y2, and the first projection y1 is located within the second projection y2. Fig.14 For example, combined with reference Fig.16 , Fig.16 It is a schematic diagram of the projection relationship between the battery cells 110 and the openings w2 in other embodiments of the present application. When there are multiple rows of battery cells 110 and multiple guide cavities D, all rows of battery cells 110 and all guide cavities D are arranged in a one-to-one correspondence, that is, all rows of battery cells 110 and all openings w2 are arranged in a one-to-one correspondence, and the first projection y1 is located within the second projection y2.

[0114] This is not only helpful in lowering the center of gravity of the entire device and improving the stability of the battery device 100 during use, but also helpful in protecting the opening w2 and improving the reliability of using the guide cavity D to dissipate heat from the battery cell 110 .

[0115] According to some embodiments of this application, please continue to refer to Figure 6 , Fig.11 and Fig.12 The wall structure 120 includes a first body 121 and a second body 122 connected to each other. The first body 121 includes at least a bottom wall 1211. The bottom wall 1211 and the second body 122 are arranged along the bottom side of the battery cell 110 and in the direction of the top side of the battery cell 110. The first body 121 and the second body 122 define a flow guide cavity D. The second body 122 has a bearing surface m disposed toward the plurality of battery cells 110, and the bearing surface m bears the plurality of battery cells 110.

[0116] In this way, using the wall structure 120 to support the battery cell 110 not only facilitates installation and maintenance, but also provides support for the battery cell 110 , thereby improving the stability of the battery cell 110 .

[0117] Of course, in other embodiments, in combination with reference Figure 7 The wall structure 120 may not carry the battery cell 110, but may hold the battery cell 110 or fix the battery cell 110 with the help of related components, which is not specifically limited here.

[0118] According to some embodiments of this application, please continue to refer to Figures 11 to 14 , the multiple battery cells 110 have a first side s1 and a second side s2 arranged opposite to each other along the first direction F1. The second body 122 includes at least three bearing portions 1221 arranged at intervals along the second direction F2, and the bearing portions 1221 extend from the first side s1 to the second side s2. All the bearing portions 1221 and the first body 121 define a plurality of flow guide cavities D. The side surfaces of all the bearing portions 1221 facing the multiple battery cells 110 constitute at least part of the bearing surface m. The bottom side of the battery cell 110 points to the direction of the top side of the battery cell 110, the first direction F1, and the second direction F2 intersect each other.

[0119] In this way, the carrying portion 1221 can not only be used to carry the battery cell 110 , but also can be used to form a required flow guiding cavity D, so that the overall structure can be more compact while being easy to install.

[0120] According to some embodiments of this application, please continue to refer to Figure 6 , Fig.11 and Fig.12 The second body 122 further includes a first connection portion 1222 and a second connection portion 1223 arranged opposite to each other along the first direction F1. One end of all the bearing portions 1221 along the second direction F2 is connected to the first connection portion 1222, and the other end of all the bearing portions 1221 along the second direction F2 is connected to the second connection portion 1223, so as to define a plurality of flow guiding cavities D. The first connection portion 1222, the second connection portion 1223 and one side surface of all the bearing portions 1221 facing the plurality of battery cells 110 constitute a bearing surface m.

[0121] In this way, the second body 122 substantially forms a frame structure, which can not only define a flow guiding cavity D with the first body 121 including at least the bottom wall 1211 and be used to carry the battery cell 110 , but also simplify the manufacturing process.

[0122] Of course, in some other embodiments, related structures may be provided at both ends of the first body 121 corresponding to the bearing portion 1221 along the second direction F2 to define a flow guiding cavity D with the bearing portion 1221. The related structure may be integrally formed with the first body 121, or may be a structure provided on the first body 121, which is not specifically limited herein.

[0123] According to some embodiments of this application, please continue to refer to Fig.11 and Fig.12 , among all the bearing parts 1221, except the first bearing part 1221 and the last bearing part 1221 arranged along the second direction F2, the bearing parts 1221 are target parts T. A liquid inlet channel p2 is arranged in at least one target part T, and the outlet of the liquid inlet channel p2 is connected to the liquid inlet w1 of the corresponding flow guiding cavity D. The flow guiding cavity D corresponding to the liquid inlet channel p2 is the flow guiding cavity D on both sides of the target part T provided with the liquid inlet channel p2 in the second direction F2.

[0124] Specifically, it can be understood in combination with the relationship between the liquid inlet channel p2 and the guide cavity D illustrated in some of the aforementioned embodiments, which will not be elaborated here. The outlet of the liquid inlet channel p2 can be arranged at one end of the corresponding bearing portion 1221 along the first direction F1, or it can be arranged at other positions of the corresponding bearing portion 1221, and no specific limitation is made here. When the outlet of the liquid inlet channel p2 is arranged at one end of the corresponding bearing portion 1221 along the first direction F1, the liquid inlet w1 of the guide cavity D can be arranged at one end of the guide cavity D along the first direction F1, and the outlet of the liquid inlet channel p2 is connected to the liquid inlet w1 of the guide cavity D.

[0125] For example, Fig.11 As an example, the case where the carrying portion 1221 located in the middle along the second direction F2 is the target portion T is illustrated. Fig.12 As an example, it is illustrated that the bearing portion 1221 adjacent to the first bearing portion 1221 and the bearing portion 1221 adjacent to the last bearing portion 1221 are both the target portion T. Fig.13 and Fig.14 , one target portion T may correspond to carrying a portion of two rows of battery cells 110 .

[0126] In this way, by setting a liquid inlet channel p2 in the carrying portion 1221 which is the target portion T, not only can the carrying portion 1221 be used to carry the battery cell 110, but also the contact portion between the battery cell 110 and the carrying portion 1221 can be heat-dissipated, and the space utilization can be further improved to obtain a more compact structure.

[0127] It should be noted that the relationship between the liquid inlet channel p2 and the flow guide cavity D shown in some of the above embodiments can be understood by referring to the matching relationship between the wall structure 120 and the plurality of battery cells 110. Figure 7 The illustrated situation can be used to understand the relationship between the liquid inlet channel p2 and the guide cavity D illustrated in some of the aforementioned embodiments, and will not be elaborated here.

[0128] According to some embodiments of this application, please continue to refer to Figure 6 , Fig.11 and Fig.12 At least one carrying portion 1221 is configured as a bent portion and connected to the bottom wall 1211 of the first body 121 .

[0129] Since the bending portion has a certain rigidity and bending resistance, the structural stability of the bearing portion 1221 constructed as a bending portion can be improved, and the reliability of the battery cell 110 can be improved. At the same time, the corresponding bearing portion 1221 is constructed as a bending portion, which is also convenient for manufacturing and installation. When the bearing portion 1221 is constructed as a bending portion and the bearing portion 1221 is the target portion T, the space defined by the bending portion and the bottom wall 1211 of the first body 121 can be used to form the liquid inlet channel p2. By controlling the shape and bending angle of the bending portion, the liquid can be more effectively guided to flow in the liquid inlet channel p2.

[0130] According to some embodiments of this application, please continue to refer to Figure 6 , Fig.11 and Fig.12 The bearing portion 1221 constructed as a bent portion is connected to the bottom wall 1211 of the first body 121 by means of a flange, and the flange and the bearing portion 1221 are an integrally formed part.

[0131] In the process of configuring the bearing portion 1221 as a bent portion, a flange can be simultaneously made, so that the bearing portion 1221 and the first body 121 can be connected by the flange, which not only further facilitates installation, but also facilitates the formation of the liquid inlet channel p2 when the bearing portion 1221 is the target portion T. The first body 121 and the flange can be connected by welding or by a seal 130 and a fastener, which is not specifically limited here.

[0132] According to some embodiments of this application, please continue to refer to Fig.12 A plurality of second bodies 122 are provided, and all second bodies 122 are arranged along the second direction F2.

[0133] When a plurality of second bodies 122 are provided and a plurality of battery cells 110 are provided in rows along the second direction F2, the second bodies 122 and each row of battery cells 110 may be provided in a one-to-one correspondence, or the like. Fig.12 and Fig.14 , the second body 122 and the two rows of battery cells 110 are arranged in one-to-one correspondence, that is, each second body 122 corresponds to two rows of battery cells 110, and the battery cells 110 corresponding to all the second bodies 122 are different. In this way, the second body 122 can be arranged accordingly according to the arrangement of the battery cells 110 and the correspondence between the battery cells 110 and the guide cavity D, and no specific limitation is made here. The two second bodies 122 adjacent to each other along the second direction F2 can be arranged at intervals or adjacent to each other. When arranged at intervals, it is conducive to installing multiple rows of battery cells 110. When arranged adjacent to each other, it is conducive to making the overall structure more compact.

[0134] In this way, the second body 122 can be flexibly arranged according to the corresponding use space, and no specific limitation is made here.

[0135] According to some embodiments of this application, please continue to refer to Figure 6 , Fig.11 and Fig.12 , the second body 122 is an integrally formed part.

[0136] In this way, the second body 122 has a certain structural strength and is easy to manufacture.

[0137] According to some embodiments of this application, please refer to Fig.17 , Fig.17 This is a partial cross-sectional structural schematic diagram of the cooperation between the battery cells 110 and the wall structure 120 in some other embodiments of the present application. The battery device 100 further includes a seal 130 , which is disposed between the bearing surface m and the plurality of battery cells 110 .

[0138] In this way, the sealing between the battery cell 110 and the bearing surface m can be improved, and it is further helpful to form a fluid channel that forces the liquid in the guide cavity D to enter the guide channel p1 through the inlet of the guide channel p1 by means of the opening w2.

[0139] It should be noted that the seal 130 may be a rubber seal 130 , a polyurethane seal 130 or the like, which can improve the sealing performance while having a certain buffering performance.

[0140] According to some embodiments of this application, please refer to Fig.18 , Fig.19 and Fig. 20 , Fig.18 Schematic diagram of the three-dimensional structure of the battery device 100 in some other embodiments of the present application, Fig.19 for Fig.18 Schematic diagram of the cross-sectional structure, Fig. 20The three-dimensional structure diagram of the partial structure of the wall structure 120 in some other embodiments of the present application, the wall structure 120 also has a receiving cavity Q, and the guide cavity D and the multiple battery cells 110 are all arranged in the receiving cavity Q. A cache cavity H is also defined between the wall structure 120 and the multiple battery cells 110, and the cache cavity H is at least arranged around the multiple battery cells 110, and the cache cavity H is connected to the outlet of the guide channel p1. The battery device 100 also includes a liquid outlet 140, and the interior of the liquid outlet 140 is connected to the cache cavity H.

[0141] For example, Figures 18 to 20 For example, when the wall structure 120 includes a first body 121 and a second body 122, the first body 121 includes a bottom wall 1211, a side wall 1212 surrounding the periphery of the bottom wall 1211, and a top wall 1213 arranged opposite to the bottom wall 1211. The top wall 1213 is connected to the side wall 1212. The bottom wall 1211, the side wall 1212 and the top wall 1213 together enclose a receiving cavity Q. Fig. 20 In the illustrated case, the top wall 1213 is not shown. The side wall 1212 can be constructed as a frame structure, and the side wall 1212 may include two side walls arranged oppositely along the first direction F1 and two side walls arranged oppositely along the second direction F2. When the plurality of battery cells 110 are matched to the wall structure 120, a cache cavity H is also defined between the wall structure 120 and the plurality of battery cells 110. The cache cavity H can be used to cache liquid. When the liquid flows out from the outlet of the guide channel p1, the liquid flows into the cache cavity H.

[0142] Exemplarily, the liquid outlet member 140 may be disposed on the side wall 1212 of the wall structure 120, and a liquid outlet channel is disposed in the liquid outlet member 140. The liquid outlet channel is connected to the buffer chamber H. The liquid outlet member 140 may be a liquid outlet joint.

[0143] In this way, by setting up the buffer cavity H, the liquid flowing out from the outlet of the guide channel p1 can flow through to cool the side of the battery cell 110 that is not involved in defining the guide channel p1, and then be discharged after being cached in the buffer cavity H, thereby being able to cool the battery cell 110 more comprehensively and improve the temperature uniformity of the battery device 100.

[0144] According to some embodiments of this application, please continue to refer to Fig. 20 The battery device 100 further includes a liquid inlet 150 , the outlet of which is connected to the liquid inlet w1 of the flow guiding cavity D. The liquid inlet 150 and the liquid outlet 140 are both disposed on the wall structure 120 and located on the same side of the wall structure 120 .

[0145] For example, Fig. 20 For example, the liquid inlet member 150 and the liquid outlet member 140 are both arranged on one side of the wall structure 120 arranged along the first direction F1. The liquid inlet member 150 may be a liquid inlet connector.

[0146] In this way, since the liquid inlet member 150 and the liquid outlet member 140 are located on the same side of the wall structure 120 , it is convenient to perform pipeline connection on the liquid inlet member 150 and the liquid outlet member 140 .

[0147] It should be noted that pump structures may be provided at the liquid inlet 150 and the liquid outlet 140 , respectively, which further facilitates the inflow and outflow of liquid.

[0148] According to some embodiments of this application, please continue to refer to Fig. 20 , the bottom side of the battery cell 110 points to the direction of the top side of the battery cell 110 , and the outlet of the liquid outlet member 140 is located downstream of the inlet of the liquid inlet member 150 .

[0149] In this way, on the one hand, the outlet of the liquid outlet 140 is located upstream of the inlet of the liquid inlet 150 in the direction of gravity, and the liquid will be more difficult to overcome gravity and flow out from the outlet of the liquid outlet 140 under the action of gravity. In this way, the liquid input through the liquid inlet 150 can flow more fully in the flow channel formed by the guide cavity D, the guide channel p1 and the buffer cavity. On the other hand, since the temperature of the hotter part of the liquid is higher, the molecular motion is intensified, the volume of this part of the liquid will expand, the density will decrease, and thus it has a tendency to flow upward. When the outlet of the liquid outlet 140 is higher, it is more conducive to improving the premature outflow of the colder part of the liquid in the buffer cavity from the outlet of the liquid outlet 140, and then the liquid in the buffer cavity can be more fully utilized to dissipate heat for the battery device 100. In addition, such a setting is also convenient for the installation of the pipeline at the liquid outlet 140 and the pipeline at the liquid inlet 150, and improves the situation where the pipeline at the liquid outlet 140 and the pipeline at the liquid inlet 150 interfere with each other.

[0150] According to some embodiments of this application, please continue to refer to Fig. 20 and Fig.21 The liquid inlet w1 of the guide cavity D and the liquid outlet 140 are respectively located on two sides of the plurality of battery cells 110 along the first direction F1.

[0151] Specifically, the liquid inlet w1 of the flow guiding cavity D is located at the first side s1 of the plurality of battery cells 110 , and the liquid outlet 140 is located at the second side s2 of the plurality of battery cells 110 .

[0152] Exemplarily, when the liquid outlet 140 and the liquid inlet 150 are both disposed on one side of the wall structure 120 close to the first side s1 of the plurality of battery cells 110, the inlet of the liquid inlet channel p2 is located on the first side s1 of the plurality of battery cells 110, and the liquid inlet w1 of the flow guide cavity D is located on the second side s2 of the plurality of battery cells 110, that is, the liquid outlet 140, the liquid inlet 150 and the inlet of the liquid inlet channel p2 are located on the same side, at this time, in combination with reference Fig.10 and Fig.21 , Fig.21 for Fig. 20 A top view of the structure. Fig.21 The second body 122 in Fig.12 The second body 122 in the figure can be understood that the liquid inlet member 150 can be connected to the inlet of the liquid inlet channel p2 through a diverter member (not shown in the figure). It can be understood that Fig.21 The arrows in the figure indicate a partial flow path of the liquid. The liquid flows into the inlet of the liquid inlet channel p2 through the liquid inlet member 150, flows into the liquid inlet w1 of the guide cavity D through the outlet of the liquid inlet channel p2, flows into the guide cavity p1 from the open port w2 of the guide cavity D, then flows into the buffer cavity from the outlet of the guide cavity p1, and then flows out from the outlet of the liquid outlet member 140.

[0153] In the process of the above-mentioned liquid flowing into the guide cavity D and flowing out from the liquid outlet 140, the liquid pressure at various locations in the guide cavity D is different, and the pressure at the liquid inlet w1 close to the guide cavity D is relatively high, and the pressure will decrease as the distance from the liquid inlet w1 of the guide cavity D increases. The distance between the inlet of the guide channel p1 and the corresponding liquid inlet w1 along the first direction F1 is recorded as the first distance. That is, when the first distance is smaller, the liquid pressure at the inlet of the guide channel p1 corresponding to the first distance will be greater, and the liquid in the guide cavity D will flow more easily into the corresponding guide channel p1. Correspondingly, the liquid pressure at various locations in the buffer cavity is also different, and the pressure close to the liquid outlet 140 is relatively high, and the pressure will decrease as the distance from the liquid outlet 140 increases. The distance between the outlet of the guide channel p1 and the liquid outlet 140 along the first direction F1 is recorded as the second distance. That is, when the second distance is smaller, the liquid pressure at the outlet of the guide channel p1 corresponding to the first distance will be greater, and the liquid at the outlet of the guide channel p1 will flow toward the liquid outlet 140 more easily.

[0154] Since the liquid inlet w1 and the liquid outlet 140 of the flow guiding cavity D are located on both sides of the plurality of battery cells 110 along the first direction F1, the corresponding flow guiding channel p1 with a larger first distance has a smaller corresponding second distance, thereby making the liquid pressure at the inlet of the flow guiding channel p1 smaller and the liquid pressure at the outlet of the flow guiding channel p1 larger. Correspondingly, the corresponding flow guiding channel p1 with a smaller first distance has a larger corresponding second distance, thereby making the liquid pressure at the inlet of the flow guiding channel p1 larger and the liquid pressure at the outlet of the flow guiding channel p1 smaller. In this way, it is beneficial to prolong the time that the liquid stays in the flow guiding channel p1, facilitate liquid cooling of the battery cells 110, and thus help improve the temperature uniformity of the battery device 100.

[0155] According to some embodiments of this application, please continue to refer to Figure 8The flow guiding channel p1 is extended along the third direction F3, and the cross-sectional area of ​​the flow guiding channel p1 is constant along the third direction F3. The cross-sectional area of ​​the flow guiding channel p1 is perpendicular to the third direction F3. The cross-sectional areas of all the flow guiding channels p1 are equal.

[0156] In this way, when the liquid inlet w1 and the liquid outlet 140 of the guide cavity D are respectively located on both sides of the multiple battery cells 110 along the first direction F1, since the guide channels p1 are consistent, the liquid flow rate and flow rate in each guide channel p1 can also tend to be consistent, which is beneficial to improving the temperature uniformity of the battery device 100.

[0157] Of course, in some other embodiments, the liquid inlet w1 of the flow guiding cavity D may also be arranged on one side of the flow guiding cavity D along the second direction F2 or at other positions, which is not specifically limited here.

[0158] According to some embodiments of this application, please continue to refer to Figure 4 , Figure 5 , Figures 7 to 10 , Fig.19 The large surfaces of two battery cells 110 adjacent to each other along the first direction F1 are arranged to face each other and define a guide channel p1.

[0159] The large surface of the battery cell 110 refers to a surface with a relatively large area in the outer shell of the battery cell 110. Figure 4 and Figure 5 The large surfaces of the battery cell 110 are two surfaces on the outer shell of the battery cell 110 that are opposite to each other along the first direction F1.

[0160] Since the large surface of the battery cell 110 is larger than the other surfaces, the heat dissipation area is also larger. Therefore, by using the large surface to define the guide channel p1, the liquid in the guide channel p1 can be further used to dissipate heat from the large surface of the battery cell 110, thereby improving the heat dissipation effect of the battery cell 110.

[0161] Of course, in some other embodiments, it may not be the large surface of the battery cell 110, but may be other side surfaces of the outer shell of the battery cell 110, and may be set in combination with the arrangement of the battery cell 110, and is not specifically limited here.

[0162] According to some embodiments of this application, please continue to refer to Figure 4 The battery device 100 further includes an isolation member G. An isolation member G is disposed between two battery cells 110 adjacent to each other along the first direction F1 to define a flow guiding channel p1.

[0163] The isolation member G can be configured as a heat insulating member, and the material of the isolation member G can be epoxy resin or fluoro rubber strip and other materials, which are not specifically limited here.

[0164] By using the isolation member G to define the flow guiding channel p1 , the manufacturing flexibility can be improved, and the outer shell of the battery cell 110 can be manufactured more easily.

[0165] Of course, in some other embodiments, in combination with reference Figure 5 As shown in some of the above embodiments, a convex portion U may be provided on the housing of the battery cell 110 to form the required flow guide channel p1. Figure 5 In the figure, only two battery cells 110 are taken as an example to illustrate the flow guiding channel p1. Among the multiple battery cells 110 arranged along the first direction F1, the battery cell 110 located in the middle is provided with convex portions U on both sides along the first direction F1. In other embodiments, the convex portion U and the isolation member G can also be combined to form the flow guiding channel p1. No specific limitation is made here.

[0166] According to some embodiments of this application, please refer to Fig. 22 , Fig. 22 The schematic diagram of the structure of the battery cell 110 and the isolation member G in some embodiments of the present application is a schematic diagram of the structure of the battery cell 110 and the isolation member G in some embodiments of the present application. The isolation member G is provided with a plurality of spoiler structures V on the side wall 1212 in the flow guide channel p1. The plurality of spoiler structures V are arranged at intervals along the direction from the bottom side of the battery cell 110 to the top side of the battery cell 110.

[0167] The flow-disturbing structure V refers to a structure in the flow path of the liquid that can change the flow state of the liquid and increase the degree of disturbance of the liquid. The flow-disturbing structure V can be a structure such as a spoiler plate or a spoiler column, and is not specifically limited here. Fig. 22 As an example, the case where the spoiler structure V is a spoiler is illustrated.

[0168] In this way, by providing the spoiler structure V, the residence time of the liquid in the flow guiding channel p1 can be prolonged, thereby facilitating heat dissipation of the battery cell 110 .

[0169] According to some embodiments of this application, please refer to Fig.23 , Fig.23 The schematic diagram of the structure of the battery cell 110 and the isolation member G in other embodiments of the present application shows that the cross-sectional area of ​​the flow guide channel p1 decreases along the direction from the bottom side of the battery cell 110 to the top side of the battery cell 110. The cross section of the flow guide channel p1 is perpendicular to the direction from the bottom side of the battery cell 110 to the top side of the battery cell 110.

[0170] The decreasing trend may be a gradual decrease or a staged decrease, which is not specifically limited here. Fig.23 As an example, it is illustrated that the cross-sectional area of ​​the flow guiding channel p1 gradually decreases along the direction from the bottom side of the battery cell 110 to the top side of the battery cell 110 .

[0171] Thus, by controlling the cross-sectional area of ​​the flow guiding channel p1 to decrease, the flow velocity of the fluid in the flow guiding channel p1 can be increased, which is conducive to the liquid flowing into the flow guiding channel p1 flowing out of the flow guiding channel p1.

[0172] According to some embodiments of this application, please refer to Fig.24 and Fig.25 , Fig.24 This is a schematic diagram of a three-dimensional structure of a battery cell 110 and an end plate 160 in some embodiments of the present application. Fig.25 Schematic diagram of the three-dimensional structure of the end plate 160 in some embodiments of the present application, the battery device 100 further includes the end plate 160. The end plates 160 are respectively provided on both sides of the plurality of battery cells 110 along the first direction F1, and a heat dissipation structure R is provided on the side of the end plate 160 away from the plurality of battery cells 110. Fig.24 A plurality of rows of battery cells 110 are briefly shown, and the battery cells 110 in each row are not distinguished and shown.

[0173] The end plate 160 may correspond to two rows of battery cells 110, one row of battery cells 110, or another number of rows of battery cells 110, which is not specifically limited here. Fig.24 As an example, the end plate 160 and two rows of battery cells 110 are shown corresponding to each other. An insulating component may be provided between the end plate 160 and the adjacent battery cells 110, or the end plate 160 is made of an insulating material. The end plate 160 and the corresponding battery cells 110 may be fixed into a group by a steel belt or other binding member.

[0174] Since the guide channel p1 is not provided on the side of the battery cell 110 adjacent to the end plate 160 facing the end plate 160 , a heat dissipation structure R is provided on the side of the end plate 160 away from the battery cell 110 , which helps to dissipate heat for the battery cell 110 adjacent to the end plate 160 , thereby further improving the temperature uniformity of the battery device 100 .

[0175] According to some embodiments of the present application, the heat dissipation structure R is configured as a heat dissipation fin.

[0176] In this way, the heat dissipation fins can increase the heat dissipation surface area, thereby helping to improve heat dissipation efficiency.

[0177] According to some embodiments of this application, please continue to refer to Fig.25 The heat dissipation structure R is configured as a recessed portion provided on a side of the end plate 160 away from the plurality of battery cells 110 .

[0178] In this way, by providing the recessed portion, it is not only helpful to increase the heat dissipation area of ​​the end plate 160, but also helpful to reduce the weight of the end plate 160, thereby facilitating the lightweighting of the entire device.

[0179] According to some embodiments of this application, please refer to Fig.26 and Fig. 27 , Fig.26 1 is a schematic diagram of the structure of the battery cell 110 and the supporting part 1221 in some embodiments of the present application. Fig. 27 for Fig.26 In the schematic diagram of the partially enlarged structure at A in the middle, the second body 122 includes a plurality of bearing parts 1221 arranged at intervals along the second direction F2. An exhaust channel p3 is provided in one of the bearing parts 1221, and a pressure relief mechanism X is provided on the bottom side of the battery cell 110. The orthographic projection of the pressure relief mechanism X on the reference plane is located within the range of the orthographic projection of the inlet of the exhaust channel p3 on the reference plane. The reference plane is perpendicular to the bottom side of the battery cell 110 and points to the direction of the top side of the battery cell 110. The exhaust channel p3 is connected to the outside of the battery device 100. That is, the inlet of the exhaust channel p3 and the pressure relief mechanism X are arranged relative to each other in the third direction F3.

[0180] In this way, by arranging the pressure relief mechanism X of the battery cell 110 at the bottom side of the battery cell 110 and using the supporting portion 1221 to form the exhaust channel p3 adapted to the pressure relief mechanism X, the contamination of the inside of the battery device 100 by the electrolyte brought out during the pressure relief process can be improved, which helps to extend the service life of the battery device 100. At the same time, because the exhaust channel p3 is arranged in the supporting portion 1221, the space utilization rate inside the battery device 100 is further improved.

[0181] It should be noted that the third direction F3 may be parallel to the direction of gravity or may not be parallel to each other. As long as the bottom side of the battery cell 110 is located below the top side of the battery cell 110 in the direction of gravity and the liquid can cool the battery cell 110, no specific limitation is made here. In the embodiment of the present application, the situation where the third direction F3 and the direction of gravity are parallel to each other is illustrated.

[0182] According to some embodiments of the present application, an energy storage system is provided, comprising the battery device 100 in any of the above embodiments.

[0183] In some embodiments, the energy storage system further includes an energy storage inverter, and the aforementioned battery device 100 is electrically connected to the energy storage inverter. The energy storage inverter can convert energy generated by solar energy, wind power generation, or fuel cells into direct current, and store it in the battery, and output the electric energy in the battery when it is needed. The energy storage system can provide users with reliable energy reserves and provide users with backup power when power is off or insufficient, which is convenient for users to use.

[0184] The advantages possessed by the above battery device 100 are also possessed by the energy storage system, and no specific limitation is made here.

[0185] According to some embodiments of the present application, an electrical device is provided, comprising the battery device 100 in any of the above embodiments.

[0186] The battery device is used as a power source for electrical equipment, which is a device that uses electrical energy as energy and realizes corresponding functions by consuming electrical energy. For example, the electrical equipment may be, but is not limited to, power tools, battery vehicles, electric vehicles, ships, spacecraft, etc.

[0187] The advantages of the above battery device 100 are also possessed by the electrical equipment, and no specific limitation is made here.

[0188] It should be noted that in Figure 1 , Fig.13 and Fig.14 In the illustrated battery device 100, relevant components in the energy storage system or relevant components in the electrical equipment can be used to form a space surrounding the battery device 100, so as to form, for example, Fig.18 The illustrated liquid flow path in the battery device 100. The battery devices 100 in different embodiments or the combination of the battery devices 100 in different embodiments can be configured according to specific usage conditions, and no specific limitation is made here.

[0189] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0190] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery device, characterized in that: include: A plurality of battery cells are arranged at least along a first direction, a guide channel is defined between two adjacent battery cells along the first direction, the bottom sides of the two battery cells define an inlet of the guide channel, and the top sides of the two battery cells define an outlet of the guide channel; and The wall structure has a flow guiding cavity, at least part of which is disposed on the bottom side of the plurality of battery cells; the flow guiding cavity has a liquid inlet and an opening disposed toward the plurality of battery cells; The plurality of battery cells and the wall structure are matched to make the inlet of the guide channel communicate with the opening, and define a fluid channel that can force the liquid flowing into the guide cavity to flow into the guide channel through the opening.

2. The battery device according to claim 1, characterized in that: The wall structure also has a liquid inlet channel, and the outlet of the liquid inlet channel is connected to the liquid inlet; The inlet of the liquid inlet channel and the liquid inlet port are located at opposite sides of the plurality of battery cells.

3. The battery device according to claim 2, characterized in that: The plurality of battery cells have a first side and a second side disposed opposite to each other along the first direction; The inlet of the liquid inlet channel is located on the first side, and the liquid inlet is located on the second side.

4. The battery device according to claim 3, characterized in that: The liquid inlet channel is provided with at least one; the flow guide cavity is provided with a plurality; All the guide cavities are arranged along the second direction; along the second direction, a liquid inlet channel is provided between at least two adjacent guide cavities; and the liquid inlets of the two adjacent guide cavities are both connected to the outlet of the liquid inlet channel provided between the two adjacent guide cavities; A direction in which the bottom side of the battery cell points to the top side of the battery cell, the first direction, and the second direction intersect each other.

5. The battery device according to any one of claims 1 to 4, characterized in that: The plurality of battery cells are arranged in at least one row along the second direction; Each row of battery cells is arranged corresponding to at least one of the diversion cavities; the inlet of the diversion channel defined by each row of battery cells is communicated with the opening of the corresponding diversion cavity; A direction in which the bottom side of the battery cell points to the top side of the battery cell, the first direction, and the second direction intersect each other.

6. The battery device according to any one of claims 1 to 4, characterized in that: The opening is provided at the bottom side of the plurality of battery cells, and the orthographic projection of the opening on the reference plane is located within the range of the orthographic projection of the plurality of battery cells on the reference plane; The reference plane is a plane perpendicular to a direction from the bottom side of the battery cell to the top side of the battery cell.

7. The battery device according to claim 6, characterized in that: The wall structure includes a first body and a second body connected to each other; The first body at least comprises a bottom wall, the bottom wall and the second body are arranged in a direction from the bottom side of the battery cell to the top side of the battery cell, and the first body and the second body define the flow guiding cavity; The second body has a carrying surface disposed toward the plurality of battery cells, and the carrying surface carries the plurality of battery cells.

8. The battery device according to claim 7, characterized in that: The plurality of battery cells have a first side and a second side disposed opposite to each other along the first direction; The second body comprises at least three bearing parts spaced apart along the second direction, the bearing parts extending from the first side to the second side; all the bearing parts and the first body define a plurality of the flow guiding cavities; a surface of one side of all the bearing parts facing the plurality of battery cells constitutes at least a part of the bearing surface; A direction in which the bottom side of the battery cell points to the top side of the battery cell, the first direction, and the second direction intersect each other.

9. The battery device according to claim 8, characterized in that: The second body further includes a first connecting portion and a second connecting portion which are arranged opposite to each other along a first direction; One end of all the bearing parts along the second direction is connected to the first connection part, and the other end of all the bearing parts along the second direction is connected to the second connection part, so as to define a plurality of the guide cavities; The first connection portion, the second connection portion, and one side surface of all the bearing portions facing the plurality of battery cells constitute the bearing surface.

10. The battery device according to claim 8, characterized in that: Among all the bearing parts, the bearing parts except the first bearing part and the last bearing part arranged along the second direction are target parts; At least one of the target parts is provided with a liquid inlet channel, the outlet of the liquid inlet channel is connected to the liquid inlet of the corresponding guide cavity; the guide cavity corresponding to the liquid inlet channel is the guide cavity on both sides of the target part provided with the liquid inlet channel in the second direction.

11. The battery device according to claim 8, characterized in that: At least one of the bearing portions is configured as a bent portion and is connected to the bottom wall of the first body.

12. The battery device according to any one of claims 1 to 4, characterized in that: The wall structure further comprises a receiving cavity, wherein the flow guiding cavity and the plurality of battery cells are both arranged in the receiving cavity; A cache cavity is further defined between the wall structure and the plurality of battery cells, the cache cavity is at least arranged around the plurality of battery cells, and the cache cavity is communicated with an outlet of the guide channel; The battery device further comprises a liquid outlet, the interior of which is communicated with the buffer cavity.

13. The battery device according to any one of claims 1 to 4, characterized in that: The battery device also includes a separator; The isolation member is disposed between two battery cells adjacent to each other along the first direction to define the flow guiding channel.

14. The battery device according to any one of claims 1 to 4, characterized in that: The battery device also includes an end plate; The end plates are respectively disposed on both sides of the plurality of battery cells along the first direction, and a heat dissipation structure is disposed on a side of the end plate away from the plurality of battery cells.

15. An energy storage system, characterized in that: Comprising a battery device as claimed in any one of claims 1 to 14.

16. An electrical equipment, characterized in that: Comprising a battery device as claimed in any one of claims 1 to 14.

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