Battery module, battery pack and energy storage system

Abstract

The utility model discloses a battery module, a battery pack and an energy storage system, and relates to the technical field of batteries. The battery module comprises a busbar support and a battery cell, the busbar support is in contact with the battery cell, the busbar support comprises a support and a flow guide pipe, the support is provided with a flow guide groove and a through hole, the through hole and an anti-explosion valve of the battery cell are oppositely arranged, so that electrolyte discharged from the anti-explosion valve is collected by the flow guide groove, and the flow guide pipe is communicated with the flow guide groove. And the flow guide pipe is used for discharging the electrolyte from a reasonable position, so that the safety of the battery in the use process is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module, a battery pack and an energy storage system. Background Art

[0002] During the use of the battery cell, due to factors such as battery overcharging and short circuit, heat is generated inside the battery cell. The electrolyte inside the battery cell is prone to produce gas due to side reactions under the action of heat, resulting in increased pressure inside the battery cell. The gas accumulates inside the battery cell, causing the pressure inside the battery cell to gradually increase, which can easily cause the battery cell shell to rupture under the action of internal pressure, affecting the safety of the battery cell during use. In order to ensure the safety of the battery cell during use, an explosion-proof valve is usually set on the battery cell, so that when the pressure inside the battery cell reaches a certain level, the gas inside the battery cell is discharged from the explosion-proof valve to achieve pressure relief inside the battery cell.

[0003] Electrolyte is contained inside the battery cell. When the gas inside the battery cell is discharged from the explosion-proof valve, the gas is likely to carry part of the electrolyte with it and be discharged from the explosion-proof valve. The flow direction of the electrolyte discharged from the explosion-proof valve is not restricted. When the electrolyte contacts structures such as the battery cell top cover, explosion-proof valve and blue film, it is easy to cause corrosion of the above-mentioned structures and affect the service life of the battery cell; when the electrolyte contacts the charged pole, bus or circuit board, it is easy to cause a short circuit or cause the electrolyte to be ignited, affecting the safety of the battery during use. Utility Model Content

[0004] The present application provides a battery module, a battery pack and an energy storage system, which collects electrolyte discharged from an explosion-proof valve by arranging a guide groove and a through hole on a bus bracket, and discharges the electrolyte from a reasonable position by arranging a guide pipe, thereby improving the safety of the battery during use.

[0005] In the first aspect, the present application provides a battery module, including a busbar bracket and a battery cell, wherein the busbar bracket is in contact with the battery cell, and the busbar bracket includes: a bracket having a guide groove and a through hole, wherein the through hole penetrates the bottom wall of the guide groove, and the through hole and the explosion-proof valve of the battery cell are arranged relative to each other; a guide tube, wherein the guide tube has a liquid receiving port and a liquid discharge port, wherein the liquid receiving port is connected to the guide groove, and in the height direction of the battery module, the height of the liquid receiving port is greater than the height of the liquid discharge port.

[0006] The battery module provided in the present application includes a bus bracket and a battery cell. The bus bracket is arranged on the battery cell. The bus bracket includes a connected bracket and a guide tube. The bracket has a guide groove and a through hole. The through hole and the explosion-proof valve of the battery cell are arranged relative to each other, so that the electrolyte sprayed from the explosion-proof valve can enter the guide groove through the through hole, so that the guide groove can collect the electrolyte discharged from the explosion-proof valve. The guide tube is connected with the guide groove, so that the electrolyte collected by the guide groove can enter the guide tube, and the electrolyte in the guide groove can be discharged in time, thereby avoiding the electrolyte in the guide groove from accumulating too much in the guide groove, and the electrolyte in the guide groove is prevented from erupting along with the gas at the explosion-proof valve, or flowing back at the through hole.

[0007] The flow guide tube has a liquid receiving port and a liquid discharge port. The liquid receiving port is connected to the flow guide groove. In the height direction of the battery module, the height of the liquid receiving port is greater than the height of the liquid discharge port, so that the electrolyte at the liquid receiving port can flow smoothly to the liquid discharge port for discharge under the action of gravity. At the same time, the liquid discharge port and the liquid receiving port are arranged at intervals. The liquid discharge port is away from the bracket in the height direction of the battery module, so that the liquid discharge port is away from the bus and the conductive structure of the battery cell. The liquid discharge port is used to discharge the electrolyte collected by the flow guide groove from the bus bracket, so that the electrolyte is discharged from a reasonable position, which is conducive to improving the safety of the battery during use.

[0008] In a possible implementation, the aperture of the through hole remains unchanged or decreases in a first direction, and the first direction is the direction of the explosion-proof valve toward the through hole. By making the aperture of the through hole in the first direction remain unchanged or decrease in a sequential manner, the aperture of the through hole remains unchanged or decreases in a sequential manner in the direction of the explosion-proof valve toward the through hole. When the electrolyte discharged from the explosion-proof valve passes through the through hole along the first direction and enters the guide groove, the gas pressure on the electrolyte in the discharge path is relatively small, so that the electrolyte discharged from the explosion-proof valve can smoothly pass through the through hole along the first direction; when the aperture of the through hole decreases in a sequential manner in the first direction, if the electrolyte in the guide groove passes through the through hole in the direction of the through hole toward the explosion-proof valve, the electrolyte will be subjected to a relatively large gas pressure due to the smaller aperture of the opening of the through hole on the side close to the guide groove, and it is difficult for the electrolyte in the guide groove to flow back at the through hole, which is conducive to realizing the anti-backflow function at the through hole and improving the safety of the battery during use.

[0009] In a possible embodiment, the bottom wall of the guide groove has a convex portion, the convex portion is located in the guide groove, and the through hole passes through the convex portion. By making the bottom wall of the guide groove have a convex portion, and the through hole passes through the convex portion, the opening of the through hole in the guide groove is located at the convex portion, and the convex portion protrudes from the bottom wall of the guide groove, so that the opening of the through hole at the convex portion is spaced apart from the bottom wall of the guide groove. Since the electrolyte in the guide groove begins to accumulate at the bottom wall of the guide groove, the electrolyte in the guide groove is prevented from contacting with the opening of the through hole in the guide groove, causing the electrolyte in the guide groove to flow back at the through hole, which is beneficial to improving the safety of the battery during use.

[0010] In a possible implementation, the height of the protrusion protruding from the bottom wall is greater than or equal to half of the depth of the guide groove. By making the height of the protrusion protruding from the bottom wall greater than or equal to half of the depth of the guide groove, the ratio of the height of the protrusion protruding from the bottom wall of the guide groove to the depth of the guide groove is within a reasonable range, and there is a reasonable spacing distance between the opening of the through hole located at the protrusion and the bottom wall of the guide groove, making it difficult for the electrolyte in the guide groove to contact the opening of the through hole at the protrusion, avoiding the electrolyte accumulated in the guide groove from flowing back at the through hole, which is beneficial to improving the safety of the battery during use.

[0011] In a possible embodiment, there is a gap between at least one side wall of the guide groove and the convex portion. By providing a gap between at least one side wall of the guide groove and the convex portion, the accumulation of electrolyte at the contact position between the convex portion and the side wall of the guide groove is reduced. Since the opening of the through hole located at the guide groove is located at the convex portion, the electrolyte accumulated at the convex portion is prevented from flowing back in the through hole, which is beneficial to improving the safety of the battery during use. At the same time, the interval between the convex portion and the side wall of the guide groove provides a flow channel for the flow of electrolyte on the bottom wall of the guide groove, avoiding the accumulation of electrolyte in the guide groove, which is beneficial to the timely discharge of the electrolyte in the guide groove.

[0012] In a possible implementation, the area of ​​the through hole is greater than or equal to the area of ​​the explosion-proof valve. By making the area of ​​the through hole greater than or equal to the area of ​​the explosion-proof valve, the edge of the through hole can enclose the explosion-proof valve of the battery cell, ensuring that the electrolyte discharged from the explosion-proof valve can completely pass through the through hole into the guide groove, thereby improving the collection capacity of the through hole and the guide groove for the electrolyte.

[0013] In a possible implementation, the guide groove includes a first guide groove and a second guide groove, the first guide groove is connected to the second guide groove, the first guide groove extends along the second direction, the second guide groove extends along the third direction, the second direction and the third direction have an angle, and the second direction and the third direction are both perpendicular to the first direction. A battery module generally includes a plurality of battery cells, and the arrangement of a plurality of battery cells in an array has reduced the space occupied by the plurality of battery cells. By making the guide groove include a first guide groove and a second guide groove, the extension directions of the first guide groove and the second guide groove are both perpendicular to the first direction, and the extension directions of the first guide groove and the second guide groove have an angle, the folding degree of the first guide groove and the second guide groove structure is improved, which is conducive to the miniaturization of the busbar bracket and the battery module, and also makes the setting mode of the first guide groove and the second guide groove more compatible with the arrangement mode of the battery cells, which is convenient for the correspondence between the guide groove and the explosion-proof valve of the battery cells.

[0014] In a possible implementation, the through hole is located in the first guide groove, and the bottom wall of the second guide groove has a flow guide hole, and the flow guide hole is connected to the liquid receiving port of the flow guide tube. By making the through hole located in the first guide groove and the flow guide hole on the bottom wall of the second guide groove, a spacing distance is provided between the through hole and the flow guide hole, which avoids the structural strength of the bracket at the location where the through hole and the flow guide hole are set to be too low, which is conducive to ensuring the stability of the bracket structure; at the same time, space is provided for the setting of the flow guide tube, avoiding interference between the flow guide tube and the battery cell.

[0015] In a possible embodiment, the number of the first guide grooves is at least two, the at least two first guide grooves are parallel, the second guide groove is connected to one end of the at least two first guide grooves, and the at least two first guide grooves are located on the same side of the second guide grooves. By making the number of the first guide grooves at least two, the second guide groove is connected to one end of the at least two first guide grooves, and since the first guide groove has a through hole and the second guide groove has a guide hole, the first guide groove is used to collect the electrolyte, and the second guide groove is used to collect the electrolyte collected by the first guide groove. When a plurality of first guide grooves need to be arranged in large numbers of battery cells, it is not necessary to set a guide tube in correspondence with the number of first guide grooves so that the electrolyte in the first guide groove can be discharged, which is conducive to reducing the number of guide tubes set and simplifying the manufacturing cost of the bus bracket. At the same time, all the first guide grooves are located on the same side of the second guide groove, which is conducive to improving the folding degree of the first guide groove and the second guide groove, and realizing the miniaturization of the bus bracket.

[0016] In a possible implementation, the second direction is perpendicular to the third direction, and the projection length of the distance between the centers of the two through holes in two adjacent first guide grooves in the third direction is equal to the spacing distance of the explosion-proof valves of the two adjacent battery cells in the third direction. By making the projection length of the distance between the centers of the two through holes in two adjacent first guide grooves in the third direction equal to the spacing distance of the explosion-proof valves of the two adjacent battery cells in the third direction, the through holes of the two adjacent first guide grooves can be opposite to the explosion-proof valves of the battery cells, thereby improving the collection efficiency of the busbar support for the electrolyte discharged from the battery cells.

[0017] In a possible implementation, the second guide groove is located at the edge of the bracket in the second direction, and the flow guide tube is connected to the edge of the bracket. By making the second guide groove located at the edge of the bracket in the second direction and the flow guide tube connected to the edge of the bracket, the flow guide tube is located outside the battery cell. Compared with the flow guide tube being located in the center area of ​​the battery cell, the flow guide tube is farther from the conductive area of ​​the battery cell, which is beneficial to improving the safety of the battery during use; at the same time, it also avoids interference between the flow guide tube and the battery cell, and provides a storage space for the battery cell.

[0018] In a possible embodiment, the guide groove extends along the second direction, the bottom wall of the guide groove has a guide hole, the guide hole is connected to the liquid receiving port of the guide tube, the guide hole is located at the end of the guide groove in the second direction, and the guide hole and the through hole are arranged at intervals. By making the guide groove extend along the second direction and the guide hole located at the end of the guide groove in the second direction, the guide hole and the through hole are both located in the extension direction of the guide groove, which is conducive to simplifying the setting method of the guide groove and the guide tube; the guide hole and the through hole are arranged at intervals to avoid the structural strength of the bracket at the setting position of the through hole and the guide hole being too low, which is conducive to ensuring the stability of the bracket structure.

[0019] In a possible embodiment, the battery module further includes a busbar, the bracket has a receiving hole, the receiving hole passes through the bracket, the busbar is located in the receiving hole, and the receiving hole and the guide groove are spaced apart. By making the bracket have a receiving hole and the busbar is located in the receiving hole, the inner wall of the receiving hole can protect and limit the busbar, and the receiving hole and the guide groove are spaced apart, which avoids the structural strength of the bracket at the position where the receiving hole and the through hole are set to be too low, which is conducive to ensuring the stability of the bracket structure, and also makes the busbar and the guide groove spaced apart, which avoids the electrolyte at the guide groove from contacting the busbar, thereby improving the safety of the battery module during use.

[0020] In a possible embodiment, the bracket includes a substrate and at least two enclosure plates, the receiving hole passes through the substrate, one side of the at least two enclosure plates is connected to the substrate, the gap between two adjacent enclosure plates forms the guide groove, and the enclosure plate is provided between the through hole and the receiving hole. By making the bracket include a substrate and at least two enclosure plates, one side of at least two enclosure plates is connected to the substrate, and the gap between two adjacent enclosure plates forms the guide groove, the thickness of the bracket in the first direction is increased, which is beneficial to improving the structural strength of the bracket; the enclosure plate is provided between the through hole and the receiving hole, so that the enclosure plate can block the electrolyte in the guide groove and prevent the electrolyte from contacting the bus at the receiving hole, which is beneficial to improving the safety of the battery module during use.

[0021] In a possible implementation, the number of the flow guide tubes is at least two, and the at least two flow guide tubes are spaced apart in a direction perpendicular to the height of the battery module. By making the number of the flow guide tubes at least two, and the at least two flow guide tubes spaced apart in a direction perpendicular to the height of the battery module, the electrolyte in the flow guide groove can be split and discharged from different flow guide tubes, which is beneficial to the heat dispersion of the electrolyte and improves the safety of the battery module during use.

[0022] In a possible implementation, the flow guide tube extends along the height direction of the battery module. By extending the flow guide tube along the height direction of the battery module, it is helpful to reduce the friction force on the electrolyte during the flow in the flow guide tube, so as to facilitate the smooth discharge of the electrolyte.

[0023] In a possible implementation, the explosion-proof valve is provided on the top surface of the battery cell, the bracket is in contact with the top surface of the battery cell, the bottom surface of the battery cell is disposed opposite to the top surface of the battery cell, and the drain port is spaced apart from the bottom surface of the battery cell. By providing a space between the drain port and the bottom surface of the battery cell, the drain port is prevented from being blocked, which facilitates the smooth discharge of the electrolyte from the guide tube.

[0024] In a possible implementation, the battery module further includes a cover plate, the cover plate is connected to the bracket, and the cover plate closes the opening of the guide groove. By making the battery module further include a cover plate, and the cover plate closes the opening of the guide groove, the cover plate further restricts the flow direction of the electrolyte, which is conducive to ensuring that the electrolyte can be collected by the guide groove.

[0025] In a second aspect, the present application further provides a battery pack, comprising the battery module and a shell as described in any one of the embodiments of the first aspect, wherein the shell encloses the battery module. The beneficial effects of this embodiment are similar to those of the above embodiments, and will not be described in detail in this embodiment.

[0026] In a third aspect, the present application further provides an energy storage system, comprising the battery pack and a power converter as described in the second aspect above, wherein the power converter is used to convert the AC power output by the external AC power source into DC power and output it to the battery pack. The beneficial effects in this embodiment are similar to those in the above embodiment, and will not be described in detail in this embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the structure of a battery module provided in an embodiment of the present application;

[0028] Figure 2 yes Figure 1 An exploded view of a battery module provided in the illustrated embodiment;

[0029] Figure 3 It is a schematic structural diagram of a busbar bracket and a busbar provided in an embodiment of the present application;

[0030] Figure 4 is a schematic structural diagram of a busbar support provided in an embodiment of the present application;

[0031] Figure 5 yes Figure 4 A schematic diagram of the structure of the busbar support provided in the embodiment shown in the figure without a cover plate;

[0032] Figure 6 yes Figure 5 A top view of the busbar support provided in the illustrated embodiment;

[0033] Figure 7 is a top view of a busbar support having at least two second guide grooves provided in an embodiment of the present application;

[0034] Figure 8 is a top view of a busbar support provided in an embodiment of the present application having only a first guide groove;

[0035] Fig. 9 yes Figure 1 A cross-sectional view of the busbar support provided in the embodiment shown at AA;

[0036] Fig.10 It is a schematic structural diagram of a busbar support with a protrusion and a battery cell provided in an embodiment of the present application;

[0037] Fig.11 yes Fig.10 A schematic diagram of the structure of the busbar support and the busbar support in the battery cell provided in the embodiment shown in the figure without the enclosure plate;

[0038] Fig.12 yes Fig.10 The embodiment shown is a cross-sectional view of the busbar support and the battery cell at position BB. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0040] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0041] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0042] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0043] It should be understood that the term "and / or" used in this article is only a description of the same field of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0044] The word "if" as used herein may be interpreted as "when" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0045] It should be understood that the terms “first”, “second”, etc. used in the present application are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying an order.

[0046] In the description of the present application, the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships 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 referred device or element 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.

[0047] In the description of this application, it should be noted that due to manufacturing errors or assembly errors, there are some angular deviations in the design that should be vertical or parallel. For example, the deviation is within 15 degrees, which also falls within the vertical or parallel described in this embodiment.

[0048] When used in this application, “within the range of…”, unless it is separately specified that an end value is not included, it is assumed that both end values ​​of the range are included. For example, in the range of 1 to 5, the two values ​​1 and 5 are included.

[0049] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a conflicting connection or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] It should be understood that in this application, "electrical connection" can be understood as the physical contact and electrical conduction of components; it can also be understood as the form in which different components in the circuit structure are connected through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit signals. "Connection" and "connected" can both refer to a mechanical connection relationship or a physical connection relationship. For example, A is connected to B or A is connected to B, which means that there is a fastening member (such as a screw, bolt, rivet, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0051] During the use of the battery cell, as the battery cell is charged and discharged, the positive and negative electrodes in the battery cell will undergo chemical reactions, causing the ions in the electrolyte in the battery cell to transfer charge. These chemical reactions and ion transfer processes will cause heat to be generated inside the battery cell, triggering side reactions in the electrolyte, causing the electrolyte to decompose and produce gas, which increases the pressure inside the battery cell. When the battery is overcharged and short-circuited, the voltage in the battery cell continues to rise, and a high amount of heat is generated inside the battery cell. This heat will accelerate the occurrence of side reactions in the electrolyte, causing the electrolyte to decompose quickly and produce a large amount of gas. The gas accumulates inside the battery cell, and the pressure inside the battery cell gradually increases, which can easily cause the battery cell shell to rupture under the action of the internal gas pressure, affecting the safety of the battery cell during use.

[0052] In order to ensure the safety of battery cells during use, an explosion-proof valve is usually provided on the battery cells. When the gas pressure inside the battery cell is lower than the opening pressure of the explosion-proof valve, the explosion-proof valve remains closed, so that the battery cell has better sealing. When the gas pressure inside the battery cell reaches or exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve opens under the pressure of the gas inside the battery cell, and discharges the gas inside the battery cell from the explosion-proof valve to the outside of the battery cell, thereby achieving pressure relief inside the battery cell.

[0053] The battery cell contains electrolyte. When the gas inside the battery cell is discharged from the explosion-proof valve, the gas is likely to carry part of the electrolyte with it and be discharged from the explosion-proof valve. The electrolyte discharged from the explosion-proof valve is ejected along with the gas, so that the flow direction of the electrolyte is not restricted. If the electrolyte contacts the battery cell top cover, explosion-proof valve, blue film and other structures, it is easy to cause corrosion of the above structures, affecting the service life of the battery cell; if the electrolyte contacts the charged pole, bus or circuit board, it is also easy to cause a short circuit, or cause the electrolyte to be ignited, affecting the safety of the battery during use.

[0054] This application provides a battery module 400, see Figure 1 and Figure 2 , Figure 1 4 shows a schematic diagram of the structure of a battery module 400 provided in an embodiment of the present application. Figure 2 Shows Figure 1The embodiment shown is an exploded view of a battery module 400. The battery module 400 includes a busbar support 100, at least two battery cells 200 and a busbar 300, wherein the battery cell 200 has a pole 202, and the busbar 300 is electrically connected to the poles 202 of two adjacent battery cells 200, so that the two adjacent battery cells 200 are connected in series.

[0055] The bus bracket 100 includes a connected bracket 10 and a guide tube 20. The bracket 10 encloses the bus 300, contacts the battery cell 200, and is fixed relative to the battery cell 200 to achieve protection and positioning of the bus 300 by the bracket 10, thereby improving the stability of the position of the bus 300 relative to the battery cell 200.

[0056] See also Figure 4 , Figure 5 and Figure 6 , Figure 4 1 shows a schematic structural diagram of a busbar support 100 provided in an embodiment of the present application. Figure 5 Shows Figure 4 The busbar support 100 provided in the embodiment shown is a schematic structural diagram without the cover plate 18. Figure 6 Shows Figure 5 A top view of a busbar support 100 provided in the illustrated embodiment. The support 10 has a guide groove 11 and a through hole 12, the through hole 12 penetrates the bottom wall of the guide groove 11, the lower surface of the bottom wall of the guide groove 11 is in contact with the surface where the explosion-proof valve 201 of the battery cell 200 is located, and the through hole 12 and the explosion-proof valve 201 of the battery cell 200 are arranged relative to each other, so that after the explosion-proof valve 201 is opened, the through hole 12 can connect the internal space of the guide groove 11 and the explosion-proof valve 201 in the open state. When the explosion-proof valve 201 is opened, the discharge of the gas in the explosion-proof valve 201 has a certain pressure, so that the electrolyte discharged from the explosion-proof valve 201 can pass through the through hole 12 under the action of pressure, and the electrolyte enters the guide groove 11, so that the electrolyte can be collected by the guide groove 11.

[0057] The flow guide tube 20 is connected to the flow guide groove 11, and the electrolyte collected by the flow guide groove 11 can be discharged from the bus support 100 through the flow guide tube 20. The flow guide tube 20 has a liquid receiving port 21 and a liquid discharge port 22. The liquid receiving port 21 is connected to the flow guide groove 11, and the electrolyte collected by the flow guide groove 11 can be discharged from the bus support 100 through the flow guide tube 20. Figure 4 , Figure 5 and Figure 6 In the Z direction), the height of the liquid receiving port 21 is greater than the height of the liquid discharging port 22, so that the electrolyte entering the guide tube 20 can flow from the liquid receiving port 21 to the liquid discharging port 22, which is conducive to the smooth discharge of the electrolyte in the guide tube 20.

[0058] The liquid receiving port 21 is connected to the bracket 10, and the liquid discharge port 22 and the liquid receiving port 21 are spaced apart so that the liquid discharge port 22 is away from the bracket 10, and the electrolyte discharge position is away from the bracket 10. The bracket 10 is used to support the bus 300, so that the electrolyte discharge position can be away from the bus 300 and other conductive structures, and the electrolyte is discharged from a reasonable position, which is conducive to improving the safety of the battery during use.

[0059] In one embodiment, the battery module 400 includes a dummy battery cell 203, which is made of a non-conductive material, and the material of the dummy battery cell 203 can be plastic. The dummy battery cell 203 is arranged in the battery module 400 together with the battery cell 200 to fill the internal space of the battery module 400 and improve the compactness of each structure of the battery module 400. The dummy battery cell 203 and the battery cell 200 support the busbar bracket 100 together, which is conducive to ensuring the stability of the position of the busbar bracket 100 and saving the manufacturing cost of the battery module 400. The dummy battery cell 203 and the battery cell 200 are arranged in an array, and the drainage port 22 of the guide tube 20 is located at the dummy battery cell 203. The drain port 22 of the flow guide tube 20 should be away from the conductive structure of the battery module 400, which includes but is not limited to the pole 202, the bus 300 and the circuit board, so that the electrolyte is discharged from the bus support 100 from a reasonable position, avoiding the electrolyte discharged from the flow guide tube 20 from contacting the conductive structure of the battery module 400, causing the electrolyte to cause a short circuit in the battery, or the electrolyte to be ignited, which is conducive to improving the safety of the battery during use. Exemplarily, the drain port 22 of the flow guide tube 20 is located at least one of the tail of the battery module 400, the side of the battery module 400, the dummy battery 203 and the fire protection module.

[0060] The guide groove 11 has an opening, and the inner wall of the guide groove 11 opposite to the opening is the bottom wall of the guide groove 11. The direction from the bottom wall of the guide groove 11 to the opening of the guide groove 11 is the first direction (eg Figure 1 , Figure 2 and Figures 4 to 6 The first direction is perpendicular to the horizontal plane, and the opening of the guide groove 11 is located on the side of the bottom wall of the guide groove 11 away from the ground, so that the bottom wall of the guide groove 11 can carry the electrolyte, and the guide groove 11 can accommodate a certain volume of electrolyte, which prevents the electrolyte collected by the guide groove 11 from easily flowing out from the opening of the guide groove 11, which is beneficial to improving the collection capacity of the guide groove 11 for the electrolyte.

[0061] The side walls of the guide groove 11 enclose the opening of the guide groove 11, and the side walls of the guide groove 11 are connected to the bottom wall of the guide groove 11. The side walls of the guide groove 11 have a certain height in the first direction relative to the bottom wall of the guide groove 11, so that the guide groove 11 has a certain depth in the first direction, which prevents the electrolyte collected by the guide groove 11 from easily flowing out of the opening of the guide groove 11, and improves the electrolyte collection capacity of the guide groove 11. The depth of the guide groove 11 can be set according to actual needs to avoid the problem that the depth of the guide groove 11 is too small compared to the discharge pressure of the electrolyte, resulting in the electrolyte at the explosion-proof valve 201 flowing directly from the opening of the guide groove 11 to the outside of the guide groove 11. The side walls of the guide groove 11 should be able to block the electrolyte and improve the electrolyte collection capacity of the guide groove 11.

[0062] The present application provides a battery module 400, which includes a bus support 100, a battery cell 200 and a bus 300. The bus support 100 is arranged on the battery cell 200. The bus support 100 is not only used to support the bus 300, but also used to collect the electrolyte discharged from the explosion-proof valve 201 of the battery cell 200, and discharge the collected electrolyte from a reasonable position, thereby reasonably utilizing the existing structure and space of the battery, realizing the constraint on the flow direction of the electrolyte, and compared with setting an additional structure to collect the electrolyte discharged from the explosion-proof valve 201, the number of parts of the battery module 400 is reduced, and the manufacturing cost and occupied space of the battery module 400 are reduced, which is conducive to improving the integration of the battery structure and realizing the miniaturization of the battery.

[0063] The busbar bracket 100 includes a connected bracket 10 and a guide tube 20. The bracket 10 has a guide groove 11 and a through hole 12. The through hole 12 and the explosion-proof valve 201 of the battery cell 200 are arranged relative to each other, so that the electrolyte sprayed from the explosion-proof valve 201 can enter the guide groove 11 through the through hole 12. The guide groove 11 collects the electrolyte discharged from the explosion-proof valve 201. The guide tube 20 is connected to the guide groove 11, so that the electrolyte collected by the guide groove 11 can enter the guide tube 20, and the electrolyte in the guide groove 11 can be discharged in time, avoiding excessive accumulation of electrolyte in the guide groove 11, and the electrolyte in the guide groove 11 is prevented from erupting with the gas at the explosion-proof valve 201, or flowing back at the through hole 12.

[0064] The guide tube 20 has a liquid receiving port 21 and a liquid discharge port 22. The liquid receiving port 21 is connected to the guide groove 11. In the height direction of the battery module 400, the height of the liquid receiving port 21 is greater than the height of the liquid discharge port 22, so that the electrolyte at the liquid receiving port 21 can flow smoothly to the liquid discharge port 22 for discharge under the action of gravity. At the same time, the liquid discharge port 22 and the liquid receiving port 21 are arranged at intervals. The liquid discharge port 22 is away from the bracket 10 in the height direction of the battery module 400, so that the liquid discharge port 22 is away from the bus 300 and the conductive structure of the battery cell 200. The liquid discharge port 22 is used to discharge the electrolyte collected by the guide groove 11 from the bus bracket 100, so that the electrolyte is discharged from a reasonable position, which is conducive to improving the safety of the battery during use.

[0065] For a possible implementation, see Figure 1 and Figure 2 The number of the guide tubes 20 is at least two. By increasing the number of the guide tubes 20, the electrolyte in the guide groove 11 can be discharged from at least two guide tubes 20, thereby improving the discharge efficiency of the electrolyte in the guide groove 11 and avoiding the accumulation of electrolyte in the guide groove 11.

[0066] At least two flow guide tubes 20 are perpendicular to the height direction of the battery module 400 (eg Figure 1 and Figure 2 The two guide tubes 20 are arranged at intervals in the direction of the Z direction in the flow guide groove 11, so that the electrolyte in the flow guide groove 11 can be split and discharged from different flow guide tubes 20. The electrolyte discharged by the explosion-proof valve 201 usually has a certain temperature. The splitting of the electrolyte in the flow guide groove 11 is conducive to the heat dispersion of the electrolyte. The electrolyte is discharged after the heat is dispersed, which is conducive to improving the safety of the battery module 400 during use.

[0067] The spacing distance between two adjacent flow guide tubes 20 can be set according to actual needs, so that there is a sufficient spacing distance between the two adjacent flow guide tubes 20 to meet the demand for electrolyte heat dispersion.

[0068] For a possible implementation, see Figure 1 and Figure 2 , the flow guide tube 20 extends along the height direction of the battery module 400, the liquid receiving port 21 of the flow guide tube 20 is located on one side of the liquid discharge port 22 of the flow guide tube 20 in the height direction of the battery module 400, and the height of the liquid receiving port 21 is greater than the height of the liquid discharge port 22. Under the action of gravity, the electrolyte in the flow guide tube 20 can flow from the liquid receiving port 21 to the liquid discharge port 22, so that the electrolyte in the bus support 100 can be smoothly discharged from the liquid discharge port 22. Compared with the angle between the extension direction of the flow guide tube 20 and the height direction of the battery module 400, the friction force on the electrolyte during the flow in the flow guide tube 20 is smaller, which is more conducive to the smooth discharge of the electrolyte.

[0069] At the same time, the flow guide tube 20 can extend along the side wall of the battery cell 200 , thereby reducing the volume of the battery module 400 in a direction perpendicular to the height direction of the battery module 400 , which is conducive to miniaturization of the battery module 400 .

[0070] In one embodiment, see Figure 1 and Figure 5 , an explosion-proof valve 201 is provided on the top surface of the battery cell 200, and the bracket 10 is fitted with the top surface of the battery cell 200 so that the through hole 12 corresponds to the explosion-proof valve 201 on the top surface of the battery cell 200. The bottom surface of the battery cell 200 and the top surface of the battery cell 200 are arranged opposite to each other, the liquid receiving port 21 of the flow guide tube 20 is close to the top surface of the battery cell 200, and the liquid discharge port 22 of the flow guide tube 20 is close to the bottom surface of the battery cell 200. There is a spacing distance between the liquid discharge port 22 and the bottom surface of the battery cell 200, which prevents the liquid discharge port 22 from being blocked, and is conducive to the smooth discharge of electrolyte from the flow guide tube 20. Exemplarily, the battery module 400 is mounted on the mounting surface, the bottom surface of the battery cell 200 is fitted with the mounting surface, and there is a spacing distance between the liquid discharge port 22 and the mounting surface, which prevents the liquid discharge port 22 from being blocked by the mounting surface.

[0071] For a possible implementation, see Figure 3 and Figure 4 , Figure 3 The structure diagram of the busbar bracket 100 and the busbar 300 provided in the embodiment of the present application is shown. The bracket 10 has a receiving hole 15, the receiving hole 15 passes through the bracket 10, the busbar 300 is located in the receiving hole 15, and the inner wall of the receiving hole 15 surrounds the busbar 300, so that the inner wall of the receiving hole 15 can protect and limit the busbar 300.

[0072] The accommodation hole 15 and the guide groove 11 are arranged at intervals, so that the bus bar 300 and the guide groove 11 are arranged at intervals, avoiding contact between the bus bar 300 and the electrolyte in the guide groove 11, which is beneficial to improving the safety of the battery module 400 during use. The through hole 12 is located on the bottom wall of the guide groove 11, so that the accommodation hole 15 and the through hole 12 are arranged at intervals, avoiding that the structural strength of the bracket 10 at the arrangement position of the accommodation hole 15 and the through hole 12 is too low, which is beneficial to ensure the stability of the bracket 10 structure.

[0073] In one embodiment, the bracket 10 includes a substrate 16 and at least two enclosing plates 17, the receiving hole 15 passes through the substrate 16, the busbar 300 passes through the substrate 16 at the receiving hole 15, and the side of the busbar 300 close to the battery cell 200 is connected to the pole 202 of the battery cell 200. The substrate 16 has a first surface 161 and a second surface 162 opposite to each other, the second surface 162 of the substrate 16 contacts the battery cell 200, and the side of the busbar 300 close to the second surface 162 is electrically connected to the pole 202 of the battery cell 200. The side of the busbar 300 close to the first surface 161 can be located in the receiving hole 15, or it can protrude from the first surface 161, so that the side of the busbar 300 close to the first surface 161 is located outside the receiving hole 15.

[0074] At least two enclosed plates 17 are located on the first surface 161 of the substrate 16, one side of at least two enclosed plates 17 is connected to the substrate 16, and the gap between two adjacent enclosed plates 17 forms a guide groove 11, so that the guide groove 11 is located on the first surface 161 of the substrate 16. The substrate 16 forms the bottom wall of the guide groove 11, and the at least two enclosed plates 17 form the side walls of the guide groove 11. Compared with setting the guide groove 11 on the substrate 16, the bracket 10 is increased in the first direction (such as Figure 3 and Figure 4 The thickness in the Z direction) is beneficial to improving the structural strength of the bracket 10; at the same time, the height of the enclosing plate 17 protruding from the base plate 16 is the depth of the guide groove 11, which simplifies the setting method of the guide groove 11 and makes the depth of the guide groove 11 more controllable.

[0075] There is an enclosure plate 17 between the through hole 12 and the receiving hole 15. The electrolyte at the explosion-proof valve 201 is discharged from the through hole 12. The bus 300 is arranged at the receiving hole 15. There is an enclosure plate 17 between the through hole 12 and the receiving hole 15, so that the enclosure plate 17 can block the electrolyte in the guide groove 11 and prevent the electrolyte from contacting the bus 300 at the receiving hole 15, which is beneficial to improving the safety of the battery module 400 during use.

[0076] Exemplarily, at least two enclosing plates 17 are parallel to the height direction of the battery module 400, and the direction from the substrate 16 to the at least two enclosing plates 17 is a first direction. The first direction is parallel to the height direction of the battery module 400, which is conducive to simplifying the arrangement of the at least two enclosing plates 17 on the substrate 16.

[0077] For a possible implementation, see Figure 4 and Figure 5 , Figure 5 Shows Figure 4The busbar support 100 provided in the embodiment shown is a schematic diagram of a structure without a cover plate 18. The battery module 400 further includes a cover plate 18, which is connected to the support 10 and closes the opening of the guide groove 11. The cover plate 18 is located on the support 10 in the first direction (eg Figure 4 and Figure 5 On one side of the guide groove 11 (in the Z direction), the through hole 12 penetrates the bottom wall of the guide groove 11 along the first direction, and the electrolyte enters the guide groove 11 along the first direction, so that the cover plate 18 is blocked in the discharge direction of the electrolyte. The cover plate 18 further restricts the flow direction of the electrolyte, avoiding the electrolyte from easily flowing to the outside of the guide groove 11 when the side wall height of the guide groove 11 is insufficient or the discharge pressure of the electrolyte is too high, which is beneficial to ensure that the electrolyte can be collected by the guide groove 11.

[0078] The guide groove 11 is connected to the guide pipe 20, and the guide pipe 20 connects the external space and the guide groove 11. The cover plate 18 closes the guide groove 11, so that the guide groove 11 is connected to the external space only through the guide pipe 20, maintaining the air pressure balance in the guide groove 11, which is beneficial for the electrolyte collected in the guide groove 11 to be discharged only through the guide pipe 20, making it easy to control the discharge position of the electrolyte.

[0079] For a possible implementation, see Figure 5 and Figure 6 The guide groove 11 includes a first guide groove 111 and a second guide groove 112. The first guide groove 111 is connected to the second guide groove 112. The first guide groove 111 is connected to the second guide groove 112. Figure 5 and Figure 6 The second guide groove 112 extends in the third direction (such as Figure 5 and Figure 6 The second direction and the third direction are perpendicular to the first direction (such as Figure 5 The second direction and the third direction have an included angle to improve the folding degree of the first guide groove 111 and the second guide groove 112 structure. Compared with the first guide groove 111 and the second guide groove 112 extending in the same direction, the length of the guide groove 11 in the extending direction is reduced, and the bracket 10 does not need to increase more space to set the guide groove 11, which improves the utilization rate of the support space of the bus 300 by the bracket 10, which is conducive to miniaturization of the bus bracket 100.

[0080] The battery module 400 usually has a plurality of battery cells 200, and the plurality of battery cells 200 are arranged in an array to reduce the space occupied by the plurality of battery cells 200, so that the extension directions of the first guide groove 111 and the second guide groove 112 have an angle, so that the setting mode of the first guide groove 111 and the second guide groove 112 is more adapted to the arrangement mode of the plurality of battery cells 200, so that the guide groove 11 and the explosion-proof valves 201 of the plurality of battery cells 200 can correspond to each other, thereby improving the collection efficiency of the bus bracket 100 for the electrolyte discharged from the explosion-proof valves 201 of the battery cells 200.

[0081] The bottom wall of the guide groove 11 has a guide hole 14, which is connected to the guide tube 20. The guide hole 14 penetrates the bottom wall of the guide groove 11 along the first direction, so that the guide groove 11 and the guide tube 20 are connected in the first direction. In the first direction, the electrolyte in the guide groove 11 is more likely to flow to the guide tube 20. The electrolyte in the guide groove 11 can flow from the bottom wall of the guide groove 11 to the drain port 22 of the guide tube 20, so that the electrolyte can be smoothly discharged from the bus bracket 100.

[0082] In one embodiment, the through hole 12 is located in the first guide groove 111, and the bottom wall of the second guide groove 112 is provided with a guide hole 14, which penetrates the bottom wall of the second guide groove 112, and the guide hole 14 is connected to the guide pipe 20, so that the first guide groove 111 is directly connected to the explosion-proof valve 201, the second guide groove 112 is directly connected to the guide pipe 20, and the second guide groove 112 can be indirectly connected to the explosion-proof valve 201 through the first guide groove 111. When the electrolyte is discharged from the explosion-proof valve 201, the electrolyte enters the first guide groove 111 through the through hole 12, and flows from the first guide groove 111 to the second guide groove 112. After the electrolyte enters the second guide groove 112, it enters the guide pipe 20 through the guide hole 14, and is discharged from the bus support 100 by the guide pipe 20.

[0083] When the explosion-proof valve 201 is opened, the through hole 12 is connected to the opened explosion-proof valve 201, so that the first guide groove 111 is at least partially arranged opposite to the battery core 200, and the guide hole 14 is connected to the liquid receiving port 21 of the guide tube 20, so that the second guide groove 112 is at least partially arranged opposite to the guide tube 20, and the through hole 12 and the guide hole 14 are respectively located in the first guide groove 111 and the second guide groove 112, and there is a spacing distance between the through hole 12 and the guide hole 14, which simplifies the setting method of the first guide groove 111 and the second guide groove 112, avoids the structural strength of the bracket 10 at the setting position of the through hole 12 and the guide hole 14 being too small, and is conducive to ensuring the stability of the structure of the bracket 10.

[0084] The flow guide hole 14 and the through hole 12 are arranged at intervals, so that the flow guide tube 20 is arranged at intervals from the through hole 12, which provides space for the arrangement of the flow guide tube 20 and avoids interference between the flow guide tube 20 and the battery cell 200; at the same time, compared with the partial overlap of the through hole 12 and the flow guide hole 14, the through hole 12 and the flow guide hole 14 have a spacing distance so that the edge of the through hole 12 is used to enclose the explosion-proof valve 201, thereby improving the sealing degree of the bracket 10 to the explosion-proof valve 201, avoiding the leakage of the electrolyte discharged from the explosion-proof valve 201 from the overlapping part of the through hole 12 and the flow guide hole 14, and improving the collection capacity of the electrolyte by the flow guide tube 20, which is beneficial to improving the safety of the battery during use.

[0085] Exemplarily, the number of through holes 12 is at least two, and at least two through holes 12 are arranged at intervals in the extension direction of the first guide groove 111. Each through hole 12 corresponds to a single explosion-proof valve 201, and the interval between two adjacent through holes 12 is set according to actual needs, so that two adjacent through holes 12 can correspond to the explosion-proof valves 201 of two adjacent battery cells 200 respectively. It can be understood that the extension direction of the first guide groove 111 is also set according to actual needs. When the explosion-proof valves 201 of at least two battery cells 200 are arranged in a straight line, the first guide groove 111 extends in a straight line direction. The busbar bracket 100 can collect the electrolyte discharged from the explosion-proof valves 201 of multiple battery cells 200 at the same time, which improves the collection efficiency of the busbar bracket 100 for the electrolyte.

[0086] For a possible implementation, see Figure 6 The number of the first guide grooves 111 is at least two, the number of the second guide grooves 112 is at least one, and the second guide groove 112 is connected to one end of at least two first guide grooves 111, so that the first guide grooves 111 are used to collect electrolytes, and the second guide grooves 112 are used to collect electrolytes collected by the first guide grooves 111. The second guide grooves 112 are connected to the flow guide tube 20, so that the electrolytes collected by the second guide grooves 112 are discharged from the flow guide tube 20. Compared with not setting the second guide grooves 112, it is not necessary to set the flow guide tubes 20 in correspondence with the number of the first guide grooves 111 so that all the electrolytes in the first guide grooves 111 can be discharged, which is conducive to reducing the number of flow guide tubes 20, simplifying the manufacturing cost of the busbar bracket 100, and realizing the miniaturization of the busbar bracket 100.

[0087] The second guide groove 112 is connected to one end of at least two first guide grooves 111, and the guide tube 20 is communicated with the second guide groove 112, so that the guide tube 20 is located at one end of the first guide groove 111. The first guide groove 111 is used to correspond to the explosion-proof valve 201 of the battery cell 200, thereby avoiding interference between the guide tube 20 and the battery cell 200 when the bus bracket 100 is set on the battery cell 200, providing an accommodation space for the battery cell 200, and helping to simplify the setting method of the bus bracket 100 on the battery cell 200.

[0088] At least two first guide grooves 111 may be located on different sides of the second guide groove 112, and at least two first guide grooves 111 may also be located on the same side of the second guide groove 112. When all the first guide grooves 111 are located on the same side of the second guide groove 112, the length of the guide groove 11 in the extension direction of the first guide groove 111 is reduced, and the space of the bracket 10 on the side where the first guide groove 111 is provided in the second guide groove 112 is fully utilized, which is conducive to miniaturization of the bracket 10. At the same time, when the busbar bracket 100 is arranged on at least two battery cells 200, the guide tube 20 connected to the second guide groove 112 can be located outside the at least two battery cells 200. Compared with the guide tube 20 being located in the middle of at least two battery cells 200, the discharge position of the electrolyte by the guide tube 20 is farther from the conductive area of ​​the battery cell 200, which is conducive to improving the safety of the battery during use.

[0089] In one embodiment, the number of the first guide grooves 111 is at least two, and at least two first guide grooves 111 are along the second direction (eg Figure 6 The at least two first guide grooves 111 are arranged in parallel, and the adjacent two first guide grooves 111 extend in a third direction (such as Figure 6 The third direction is perpendicular to the second direction. The number of the second guide groove 112 is one, and the second guide groove 112 extends straight along the third direction. At least two first guide grooves 111 are located on the same side of the second guide groove 112 in the second direction.

[0090] In one embodiment, the third direction is perpendicular to the second direction, and two adjacent first guide grooves 111 both have through holes 12. The projection length of the centers of two different through holes 12 located in the two adjacent first guide grooves 111 in the third direction is equal to the spacing distance between the explosion-proof valves 201 of two adjacent battery cells 200 in the third direction, so that the through holes 12 of the two adjacent first guide grooves 111 can be opposite to the explosion-proof valves 201 of the battery cells 200, thereby improving the collection efficiency of the bus bracket 100 for the electrolyte discharged from the battery cells 200.

[0091] For a possible implementation, see Figure 6 The second guide groove 112 is located at the edge of the bracket 10 in the second direction, and the flow guide tube 20 is connected to the edge of the bracket 10, so that the flow guide tube 20 is located outside the battery cell 200. Compared with the flow guide tube 20 being located in the central area of ​​the battery cell 200, the flow guide tube 20 is farther from the conductive area of ​​the battery cell 200, which is beneficial to improving the safety of the battery during use; at the same time, it also avoids interference between the flow guide tube 20 and the battery cell 200, and provides a storage space for the battery cell 200. Exemplarily, the second guide groove 112 extends straight along the third direction at the edge of the bracket 10 in the second direction.

[0092] For a possible implementation, see Figure 7 , Figure 7 A top view of a busbar support 100 provided in an embodiment of the present application having at least two second guide grooves 112 is shown. The number of the second guide grooves 112 is at least two, and the number of the first guide grooves 111 is at least one. The first guide groove 111 is connected to one end of the at least two second guide grooves 112, so that the first guide groove 111 is used to collect electrolyte, and the second guide groove 112 is used to discharge the electrolyte in the first guide groove 111 in time. The second guide groove 112 is connected to the guide tube 20, and the second guide groove 112 and the guide tube 20 are arranged in a one-to-one correspondence, so that the number of the guide tube 20 is at least two, and at least two guide tubes 20 can discharge the electrolyte in time, which is conducive to improving the discharge efficiency of the electrolyte in the first guide groove 111 and avoiding the accumulation of electrolyte in the first guide groove 111.

[0093] The first guide groove 111 is connected to one end of at least two second guide grooves 112, and the flow guide tube 20 is in communication with the second guide groove 112, so that the flow guide tube 20 can be arranged at intervals from the first guide groove 111. The first guide groove 111 is used to correspond to the explosion-proof valve 201 of the battery cell 200, avoiding interference between the flow guide tube 20 and the battery cell 200 when the busbar bracket 100 is arranged on the battery cell 200, providing an accommodation space for the battery cell 200, and being conducive to simplifying the arrangement of the busbar bracket 100 on the battery cell 200. Exemplarily, the two ends of the second guide groove 112 are respectively connected to the first guide groove 111 and the flow guide tube 20.

[0094] In one embodiment, the number of the first guide groove 111 is one, and one first guide groove 111 is arranged along the second direction (eg Figure 7 The number of the second guide grooves 112 is at least two, and at least two second guide grooves 112 are arranged along the third direction (such as Figure 7 The first guide groove 111 is provided in a straight line (in the X direction in the figure), at least two second guide grooves 112 are arranged in parallel and spaced apart, two adjacent second guide grooves 112 are spaced apart in the second direction, and at least two second guide grooves 112 are located on the same side of the first guide groove 111 in the third direction. When the busbar support 100 is arranged on the battery cell 200, the electrolyte flows along the second direction after entering the first guide groove 111, and a plurality of second guide grooves 112 are arranged in communication in the second direction, so that the electrolyte can be discharged in time.

[0095] For a possible implementation, see Figure 8 , Figure 8 FIG. 1 shows a top view of the busbar support 100 provided in the embodiment of the present application, which only has the first guide groove 111. The guide groove 11 is arranged along the second direction (eg Figure 8The guide groove 11 extends in the Y direction (in the Y direction), the bottom wall of the guide groove 11 has a guide hole 14, the guide hole 14 is connected to the liquid receiving port 21 of the guide tube 20, the guide hole 14 is located at the end of the guide groove 11 in the second direction, and the guide hole 14 and the through hole 12 are arranged at intervals, so that the guide hole 14 and the through hole 12 are both located in the extension direction of the guide groove 11, which is conducive to simplifying the arrangement of the bracket 10 and the guide tube 20. The guide hole 14 and the through hole 12 are arranged at intervals to avoid the structural strength of the bracket 10 at the arrangement position of the through hole 12 and the guide hole 14 being too low, which is conducive to ensuring the stability of the structure of the bracket 10.

[0096] The guide hole 14 can be located at one end of the guide groove 11 in the second direction, so that a single guide groove 11 is connected to a single guide tube 20; or the guide hole 14 can be located at both ends of the guide groove 11 in the second direction, so that the two ends of the single guide groove 11 are respectively connected to two guide tubes 20, so that the electrolyte in the guide groove 11 can be discharged from the two guide tubes 20, thereby achieving heat dispersion of the electrolyte and improving the safety of the battery module 400 during use.

[0097] For a possible implementation, see Fig. 9 , Fig. 9 Shows Figure 1 The cross-sectional view of the busbar support 100 provided in the embodiment shown is taken at AA. The direction of the explosion-proof valve 201 toward the through hole 12 is the first direction (eg Fig. 9 In the first direction, the aperture of the through hole 12 remains unchanged or decreases successively.

[0098] The two ends of the through hole 12 are respectively a first opening 121 and a second opening 122. The first opening 121 is located in the guide groove 11. The edge of the second opening 122 encloses the explosion-proof valve 201 of the battery cell 200. The electrolyte discharged from the explosion-proof valve 201 enters the guide groove 11 along the first direction from the second opening 122 toward the first opening 121, so that the area of ​​the first opening 121 is less than or equal to the area of ​​the second opening 122.

[0099] When the area of ​​the first opening 121 is equal to the area of ​​the second opening 122, the aperture of the through hole 12 remains unchanged in the direction from the second opening 122 to the first opening 121, which is beneficial to simplify the setting method of the through hole 12, making the production and manufacturing of the bus bracket 100 simpler; at the same time, when the electrolyte enters the through hole 12, the electrolyte will not be blocked by the inner wall of the through hole 12, and the process of the electrolyte passing through the through hole 12 is smoother, which is beneficial for the electrolyte to enter the guide groove 11.

[0100] When the area of ​​the first opening 121 is smaller than the area of ​​the second opening 122, the aperture of the through hole 12 gradually decreases in the direction from the second opening 122 to the first opening 121, and the shape of the through hole 12 is funnel-shaped. When the electrolyte at the explosion-proof valve 201 is discharged from the second opening 122 to the first opening 121, the gas pressure to which the electrolyte at the explosion-proof valve 201 is subjected during the discharge process gradually decreases, so that the electrolyte at the explosion-proof valve 201 can be smoothly discharged from the second opening 122 to the first opening 121. After the electrolyte enters the guide groove 11, the aperture of the through hole 12 gradually increases in the direction from the first opening 121 to the second opening 122. The aperture of the first opening 121 is smaller than that of the second opening 122, so that the electrolyte in the guide groove 11 is blocked by the gas pressure in the through hole 12 at the first opening 121, and the electrolyte in the guide groove 11 is not easy to flow back from the first opening 121 to the second opening 122, which is conducive to realizing the anti-backflow function at the through hole 12 and improving the safety of the battery during use.

[0101] In one embodiment, the area of ​​the through hole 12 is greater than or equal to the area of ​​the explosion-proof valve 201, so that the area of ​​the second opening 122 is greater than or equal to the area of ​​the explosion-proof valve 201, so that the edge of the second opening 122 can enclose the explosion-proof valve 201 of the battery cell 200, ensuring that the electrolyte discharged from the explosion-proof valve 201 can completely pass through the through hole 12 into the guide groove 11, thereby improving the collection capacity of the guide groove 11 for the electrolyte.

[0102] For a possible implementation, see Fig.10 and Fig.11 , Fig.10 The structure diagram of the busbar support 100 and the battery cell 200 provided with the protrusion 13 according to the embodiment of the present application is shown. Fig.11 Shows Fig.10 The busbar support 100 and the battery cell 200 provided in the illustrated embodiment are schematic diagrams of the structure in which the busbar support 100 is not provided with the enclosure plate 17. The bottom wall of the guide groove 11 has a convex portion 13, the convex portion 13 protrudes from the bottom wall of the guide groove 11, the convex portion 13 is located in the guide groove 11, and the convex portion 13 does not extend from the opening of the guide groove 11, so that the convex portion 13 is completely accommodated in the guide groove 11.

[0103] The through hole 12 is located at the convex portion 13, and the through hole 12 passes through the convex portion 13. The convex portion 13 has a first opening 121 of the through hole 12. Since the convex portion 13 is completely accommodated in the guide groove 11, it is ensured that the first opening 121 is located in the guide groove 11. Compared with the convex portion 13 protruding from the guide groove 11 and the first opening 121 being located outside the guide groove 11, the electrolyte discharged from the explosion-proof valve 201 is more easily collected by the guide groove 11, avoiding the electrolyte from flowing to the outside of the guide groove 11, which is beneficial to ensuring the collection effect of the guide groove 11 on the electrolyte.

[0104] The convex portion 13 protrudes from the bottom wall of the guide groove 11, so that the first opening 121 located at the convex portion 13 and the bottom wall of the guide groove 11 have a spacing distance. The spacing distance between the first opening 121 and the bottom wall of the guide groove 11 should be greater than the height of the electrolyte that can be accumulated at the bottom of the guide groove 11, thereby preventing the electrolyte accumulated in the guide groove 11 from flowing back at the through hole 12, that is, preventing the electrolyte from flowing back at the self-explosion-proof valve 201, which is beneficial to improving the safety of the battery during use.

[0105] The surface of the protrusion 13 facing away from the bottom wall of the guide groove 11 is located in the guide groove 11 , and one end opening of the through hole 12 is located on the surface of the protrusion 13 facing away from the bottom wall to ensure that the first opening 121 of the through hole 12 is located in the guide groove 11 .

[0106] Exemplarily, the bracket 10 includes a substrate 16 and a convex portion 13, the convex portion 13 is located on a first surface 161 of the substrate 16, and the convex portion 13 is located on the substrate 16 in a first direction (eg Fig.10 and Fig.11 The protrusion 13 is located on one side on the Z direction in the direction of the projection 13, and the protrusion 13 protrudes from the first surface 161 of the substrate 16 along the first direction. The through hole 12 penetrates the protrusion 13 and the substrate 16 simultaneously along the first direction, so that the first opening 121 of the through hole 12 is located on the surface of the protrusion 13 facing away from the substrate 16, and the second opening 122 of the through hole 12 is located on the second surface 162. The direction from the protrusion 13 to the substrate 16 and the direction in which the through hole 12 penetrates the protrusion 13 and the substrate 16 are both the first direction, which is conducive to simplifying the setting method of the protrusion 13 and the through hole 12, so that the production and manufacturing of the bus bracket 100 are simpler. The protrusion 13 and the substrate 16 can be two independent components, and the protrusion 13 and the substrate 16 are connected and fixed; or, the protrusion 13 and the substrate 16 can be an integrated structure, which is not limited in the present application.

[0107] For a possible implementation, see Fig.10 The convex portion 13 is located on the bottom wall of the guide groove 11, and the first opening 121 of the through hole 12 is located on the surface of the convex portion 13 facing away from the bottom wall. The number of the side walls of the guide groove 11 is at least two, and the side walls of at least two guide grooves 11 jointly enclose the opening of the guide groove 11. The convex portion 13 is spaced apart from the side wall of at least one guide groove 11, so that the convex portion 13 does not contact the side wall of at least one guide groove 11.

[0108] When the protrusion 13 contacts the side wall of the flow guide groove 11, the surface of the protrusion 13 facing away from the bottom wall of the flow guide groove 11 contacts the side wall of the flow guide groove 11, and the electrolyte is easily accumulated at the position where the surface contacts the side wall, so that the electrolyte accumulates on the surface of the bottom wall of the flow guide groove 11 facing away from the protrusion 13, causing the electrolyte to easily flow back at the first opening 121. By spacing the protrusion 13 from at least one side wall, the accumulation of electrolyte on the surface of the bottom wall of the protrusion 13 facing away from the flow guide groove 11 is avoided, which is conducive to reducing the possibility of electrolyte backflow. At the same time, a gap is provided between the protrusion 13 and the side wall of the flow guide groove 11, providing a flow channel for the flow of electrolyte on the bottom wall of the flow guide groove 11, avoiding the accumulation of electrolyte in the flow guide groove 11, and facilitating the timely discharge of electrolyte in the flow guide groove 11.

[0109] For a possible implementation, see Fig.10 and Fig.11 The number of the protrusions 13 is at least two, each protrusion 13 has a single through hole 12, and the single through hole 12 of each protrusion 13 is used to communicate with a single explosion-proof valve 201. A single battery cell 200 is usually provided with a single explosion-proof valve 201, so that the protrusions 13, the through holes 12, the explosion-proof valve 201 and the battery cell 200 are arranged in a one-to-one correspondence.

[0110] At least two protrusions 13 are arranged at intervals, so that the two through holes 12 on two adjacent protrusions 13 are arranged at intervals, avoiding the two adjacent protrusions 13 being too close to each other, causing the electrolyte to flow back at the two through holes 12 on the two adjacent protrusions 13, which is beneficial to ensuring the collection capacity of the guide groove 11 for the electrolyte.

[0111] For a possible implementation, see Fig.12 , Fig.12 Shows Fig.10 The embodiment shown is a cross-sectional view of the busbar support 100 and the battery cell 200 at BB. The protrusion 13 is located on the bottom wall of the guide groove 11, and the first opening 121 of the through hole 12 is located on the surface of the protrusion 13 facing away from the bottom wall. The height of the protrusion 13 protruding from the bottom wall is h, and the depth of the guide groove 11 is H, H / 2≤h<H, so that the height of the protrusion 13 protruding from the bottom wall is greater than or equal to half of the depth of the guide groove 11 and less than the depth of the guide groove 11. The height of the protrusion 13 protruding from the bottom wall is the minimum distance from the surface of the protrusion 13 facing away from the bottom wall to the bottom wall of the guide groove 11, and the depth of the guide groove 11 is the minimum distance from the edge of the opening of the guide groove 11 to the bottom wall of the guide groove 11.

[0112] By making the convex portion 13 and the guide groove 11 satisfy the above relationship, the ratio of the height of the convex portion 13 protruding from the bottom wall of the guide groove 11 to the depth of the guide groove 11 is within a reasonable range, and there is a certain distance between the surface of the convex portion 13 facing away from the bottom wall and the bottom wall of the guide groove 11, that is, the first opening 121 and the bottom wall of the guide groove 11 are in the first direction (such as Fig.12 The first opening 121 has a certain distance from the bottom wall of the guide groove 11 in the Z direction, and the spacing distance between the first opening 121 and the bottom wall of the guide groove 11 should be greater than the height of the electrolyte that can be accumulated at the bottom of the guide groove 11, so as to avoid the electrolyte accumulated in the guide groove 11 from flowing back at the through hole 12, which is beneficial to improving the safety of the battery during use. At the same time, the first opening 121 has a certain distance from the opening of the guide groove 11 in the first direction, so that the electrolyte discharged from the first opening 121 is more easily collected by the guide groove 11, and the electrolyte is prevented from flowing to the outside of the guide groove 11, which is beneficial to ensure the collection effect of the guide groove 11 on the electrolyte.

[0113] The present application also provides a battery pack, comprising a shell and the battery module 400 described in any one of the above embodiments, wherein the shell encloses the battery module 400 so that the shell protects the battery module 400 .

[0114] It can be understood that the battery pack in this embodiment has the battery module 400 in the above embodiment. Therefore, the battery pack in this embodiment has all the technical effects of the battery module 400 in the above embodiment. Since the technical effects of the battery module 400 have been fully explained in the above embodiment, they will not be repeated here.

[0115] This application also provides an energy storage system, see Figure 1 , including a power converter and the battery pack described in the above embodiment, the power converter is used to convert the AC power output by the external AC power source into DC power and output it to the battery pack.

[0116] It can be understood that the energy storage system in this embodiment has the battery pack in the above-mentioned embodiment. Therefore, the energy storage system in this embodiment has all the technical effects of the battery pack in the above-mentioned embodiment. Since the technical effects of the battery pack have been fully explained in the above-mentioned embodiment, they will not be repeated here.

[0117] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery module, characterized in that: The invention comprises a busbar support and a battery cell, wherein the busbar support is in contact with the battery cell, and the busbar support comprises: A bracket, comprising a guide groove and a through hole, wherein the through hole penetrates the bottom wall of the guide groove, and the through hole and the explosion-proof valve of the battery cell are arranged opposite to each other; The flow guide tube has a liquid receiving port and a liquid discharge port, the liquid receiving port is connected to the flow guide groove, and in the height direction of the battery module, the height of the liquid receiving port is greater than the height of the liquid discharge port.

2. The battery module according to claim 1, characterized in that: In a first direction, the aperture of the through hole remains unchanged or decreases successively, and the first direction is the direction in which the explosion-proof valve faces the through hole.

3. The battery module according to claim 1 or 2, characterized in that: The bottom wall of the guide groove has a convex portion, the convex portion is located in the guide groove, and the through hole passes through the convex portion.

4. The battery module according to claim 3, characterized in that: The height of the protrusion protruding from the bottom wall is greater than or equal to half the depth of the guide groove.

5. The battery module according to claim 3 or 4, characterized in that: There is a gap between at least one side wall of the guide groove and the protrusion.

6. The battery module according to any one of claims 1 to 5, characterized in that: The area of ​​the through hole is greater than or equal to the area of ​​the explosion-proof valve.

7. The battery module according to any one of claims 1 to 6, characterized in that: The guide groove includes a first guide groove and a second guide groove, the first guide groove is connected to the second guide groove, the first guide groove extends along a second direction, the second guide groove extends along a third direction, the second direction and the third direction have an angle, and the second direction and the third direction are both perpendicular to the height direction of the battery module.

8. The battery module according to claim 7, characterized in that: The through hole is located in the first guide groove, and a flow guide hole is provided on the bottom wall of the second guide groove. The flow guide hole is communicated with the liquid receiving port of the flow guide pipe.

9. The battery module according to claim 8, characterized in that: The number of the first guide grooves is at least two, the at least two first guide grooves are parallel, the second guide groove is connected to one end of the at least two first guide grooves, and the at least two first guide grooves are located on the same side of the second guide groove.

10. The battery module according to claim 9, characterized in that: The second direction is perpendicular to the third direction, and a projection length of a distance between centers of two through holes in two adjacent first guide grooves in the third direction is equal to a spacing distance between explosion-proof valves of two adjacent battery cells in the third direction.

11. The battery module according to any one of claims 8 to 10, characterized in that: The second guide groove is located at an edge of the bracket in the second direction, and the guide pipe is connected to the edge of the bracket.

12. The battery module according to any one of claims 1 to 6, characterized in that: The guide groove extends along the second direction, the bottom wall of the guide groove has a guide hole, the guide hole is connected to the liquid receiving port of the guide tube, the guide hole is located at the end of the guide groove in the second direction, and the guide hole and the through hole are arranged at intervals.

13. The battery module according to any one of claims 1 to 12, characterized in that: The battery module further includes a bus bar, the bracket has a receiving hole, the receiving hole penetrates the bracket, the bus bar is located in the receiving hole, and the receiving hole and the guide groove are arranged at intervals.

14. The battery module according to claim 13, characterized in that: The bracket includes a base plate and at least two enclosing plates, the accommodating hole passes through the base plate, one side of the at least two enclosing plates is connected to the base plate, the gap between two adjacent enclosing plates forms the guide groove, and the enclosing plate is provided between the through hole and the accommodating hole.

15. The battery module according to any one of claims 1 to 14, characterized in that: The number of the flow guide tubes is at least two, and at least two of the flow guide tubes are spaced apart in a direction perpendicular to the height of the battery module.

16. The battery module according to any one of claims 1 to 15, characterized in that: The flow guide pipe extends along the height direction of the battery module.

17. The battery module according to any one of claims 1 to 16, characterized in that: The explosion-proof valve is arranged on the top surface of the battery core, the bracket is in contact with the top surface of the battery core, the bottom surface of the battery core is arranged opposite to the top surface of the battery core, and the drain port is spaced apart from the bottom surface of the battery core.

18. The battery module according to any one of claims 1 to 17, characterized in that: The battery module also includes a cover plate, which is connected to the bracket and closes the opening of the guide groove.

19. A battery pack, characterized in that: It comprises the battery module and a shell as described in any one of claims 1 to 18, wherein the shell encloses the battery module.

20. An energy storage system, characterized in that: It comprises the battery pack and the power converter as described in claim 19 above, wherein the power converter is used to convert the AC power output by an external AC power source into DC power and output it to the battery pack.

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