Energy storage lower box body and energy storage device

Abstract

The invention relates to the technical field of energy storage equipment, in particular to an energy storage lower box body and an energy storage device. An energy storage lower box body in the energy storage device comprises a bottom bracket and a liquid cooling plate, the liquid cooling plate comprises a first plate body and a second plate body, the first plate body is located above the second plate body, the first plate body comprises a center part and an edge part arranged on the peripheral side of the center part, and the center part is sunken downwards relative to the edge part; the lower end face of the first plate body forms a first convex end face, the upper end face of the second plate body is provided with a downwards-sunken flow channel groove, the first convex end face and the upper end face of the second plate body are fixed in a sealed mode, the first convex end face and the flow channel groove jointly define a cooling flow channel, and the edge portion is fixedly connected with the bottom bracket. The bottom bracket can drive the edge part to move relative to the central part, but as the edge part is not provided with a cooling flow channel, the normal use of the cooling flow channel cannot be influenced by deformation and deviation of the edge part, the protection on the cooling flow channel is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and particularly to an energy storage lower box body and an energy storage device. Background Art

[0002] An energy storage device is a device for storing electrical energy, designed to release the stored energy when power supply is needed. The energy storage device includes an energy storage component, an energy storage lower box body, an energy storage upper box body, and a control and management system. The energy storage lower box body is used to accommodate the energy storage component and dissipate heat from the energy storage component. The energy storage upper box body is covered above the energy storage lower box body to fix the energy storage device in the energy storage lower box body. The control and management system is responsible for monitoring and controlling the flow, storage, and release of energy in the energy storage component.

[0003] In the prior art, the energy storage lower box body includes a liquid cooling plate and a support frame. The support frame is composed of several support cross beams, support longitudinal beams, and reinforcing beams and other components. To strengthen the structural strength of the energy storage lower box body, components such as the support cross beams, support longitudinal beams, and reinforcing beams need to be welded and fixed to the liquid cooling plate to form an integral body. Since components such as the support cross beams, support longitudinal beams, and reinforcing beams are welded and fixed to the areas of the liquid cooling plate where the cooling channels are arranged respectively, when the energy storage lower box body is subjected to collision or impact, components such as the support cross beams, support longitudinal beams, and reinforcing beams will drive the parts of the liquid cooling plate fixed to the support cross beams, support longitudinal beams, and reinforcing beams to move, resulting in different degrees of deviation, and further damaging the cooling channels in the liquid cooling plate, leading to the scrapping of the energy storage lower box body.

[0004] Therefore, it is urgent to invent an energy storage lower box body and an energy storage device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy storage lower box body and an energy storage device to realize the fixed connection between the area of the liquid cooling plate where the cooling channels are not arranged and the bottom bracket, and improve the protection of the cooling channels.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] An energy storage lower box body, comprising:

[0008] A bottom bracket;

[0009] A liquid cooling plate, the bottom bracket is used to support the liquid cooling plate. The liquid cooling plate includes a first plate body and a second plate body. The first plate body is located above the second plate body. The first plate body includes a central part and an edge part arranged on the periphery of the central part. The central part is recessed downward relative to the edge part, so that the lower end surface of the first plate body forms a first convex end surface. The second plate body is provided with a downwardly recessed flow channel groove. The first convex end surface is hermetically fixed to the upper end surface of the second plate body. The first convex end surface and the flow channel groove together enclose a cooling channel;

[0010] The edge part is fixedly connected to the bottom bracket.

[0011] As an alternative, the liquid cooling plate further includes:

[0012] Two docking joints, one end of each docking joint is fixedly connected to the end face of the central part, the other end of each docking joint passes through the side wall of the central part in the up and down direction and is fixedly connected to the side wall, the flow channels of each docking joint are communicated with the cooling flow channel, and the flow channels of the two docking joints are respectively communicated with the input end and the output end of the cooling circulation driving device.

[0013] As an alternative, each docking joint includes:

[0014] A first fixing part, the first fixing part extends in the horizontal direction, the first fixing part passes through the side wall of the central part in the up and down direction, and the first fixing part is fixedly connected to the side wall by welding; and

[0015] A second fixing part, connected to an axial end of the first fixing part, the second fixing part extends in the vertical direction, and the second fixing part is fixedly connected to the upper end face of the central part by welding;

[0016] A first through hole extending along the axial direction thereof is provided in the first fixing part, a second through hole extending along the axial direction thereof is provided in the second fixing part, and the first through hole and the second through hole are mutually communicated to form the flow channel.

[0017] As an alternative, a circumferentially extending welding ring is provided on the outer peripheral wall of the axial direction of the first fixing part, and the welding ring abuts against and is fixedly connected to the side wall of the central part by welding;

[0018] An axially outwardly extending annular plugging convex platform is provided on the end face of the second fixing part axially away from the first fixing part, the second through hole is located at the axial center of the annular plugging convex platform, a plugging hole is provided in the central part, the annular plugging convex platform is in plugging fit with the plugging hole, and the end face of the second fixing part axially away from the first fixing part is fixedly connected to the upper end face of the central part by welding.

[0019] As an alternative, the liquid cooling plate further includes:

[0020] An electrical fixing bracket, the electrical fixing bracket is fixedly connected to the upper end face of the central part, and the electrical fixing bracket is used for clamping and fixing electrical components.

[0021] As an alternative, the bottom bracket includes:

[0022] A support frame, the support frame being of a rectangular frame structure, and the support frame being fixedly connected to the edge portion;

[0023] Reinforcing beams and blind rivets. A plurality of the reinforcing beams are respectively fixed in the rectangular frame of the support frame along the transverse and longitudinal directions by the blind rivets, and the reinforcing beams are used to support the second plate body.

[0024] As an alternative, the energy storage lower box body further includes:

[0025] Structural adhesive. The upper end surface of each reinforcing beam is covered with the structural adhesive, and the structural adhesive fills the gap between the lower end surface of the second plate body and the upper end surface of the reinforcing beam.

[0026] As an alternative, the energy storage lower box body further includes:

[0027] Foamed insulation layer, and the foamed insulation layer covers the lower part of the bottom bracket.

[0028] As an alternative, the energy storage lower box body further includes:

[0029] Rivnut; and

[0030] Bolts. The rivnut fixedly connects the edge portion and the bottom bracket from above, and the bolts fixedly connect the edge portion and the bottom bracket from below, and the rivnut and the bolts do not interfere with each other.

[0031] An energy storage device, including an energy storage member, an energy storage upper box body, a control and management system, and the energy storage lower box body as described above. The energy storage lower box body and the energy storage upper box body jointly enclose a storage space for accommodating the energy storage member. The energy storage member has a first state for storing energy and a second state for releasing energy, and the control and management system is used to control the energy storage member to switch between the first state and the second state.

[0032] Advantages of the present invention:

[0033] The energy storage lower box body provided by the present invention splits the first plate body in the liquid cooling plate into a central part and an edge part located on the periphery of the central part, making the central part recess downward relative to the edge part, forming a first convex end face on the lower end face of the central part. Combining with the flow channel groove recessed downward on the upper end face of the second plate body, using the sealing and fixing of the first convex end face and the upper end face of the second plate body, the first convex end face and the flow channel groove jointly enclose a cooling flow channel, enabling the liquid cooling plate to have a liquid cooling and heat dissipation function. By fixedly connecting the edge part with the bottom bracket for supporting the liquid cooling plate, when the energy storage lower box body is collided or impacted, the bottom bracket will drive the edge part to move. However, since there is no cooling flow channel in the area where the edge part is located, the deformation and offset generated by the edge part will not affect the normal use of the cooling flow channel, improving the protection of the cooling flow channel.

[0034] The present invention also provides an energy storage device. By applying the above-mentioned energy storage lower box body, when the energy storage lower box body in the energy storage device is collided or impacted, the bottom bracket will drive the edge part to move. However, since there is no cooling flow channel in the area where the edge part is located, the deformation and offset generated by the edge part will not affect the normal use of the cooling flow channel, improving the protection of the cooling flow channel, and further improving the service life of the energy storage device. Brief Description of the Drawings

[0035] Figure 1 is an exploded view of the structure of the energy storage lower box body provided by an embodiment of the present invention;

[0036] Figure 2 is an exploded view of the structure of the liquid cooling plate provided by an embodiment of the present invention;

[0037] Figure 3 is a partial cross-sectional view of the docking joint and the liquid cooling plate provided by an embodiment of the present invention;

[0038] Figure 4 is an exploded view of the structure of the bottom bracket provided by an embodiment of the present invention.

[0039] In the figure:

[0040] 1000, energy storage lower box body;

[0041] 100, liquid cooling plate; 110, first plate body; 111, central part; 1111, insertion hole; 112, edge part; 120, second plate body; 121, flow channel groove; 130, docking joint; 131, first fixing part; 1311, welding ring; 132, second fixing part; 1321, annular insertion boss; 133, flow-through channel; 140, electrical fixing bracket;

[0042] 200, bottom bracket; 210, support frame; 211, support cross beam; 212, support longitudinal beam; 220, strengthening beam; 230, blind rivet;

[0043] 300, rivet nut;

[0044] 400, bolt. Specific embodiments

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0046] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0048] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0049] This embodiment provides an energy storage device. The energy storage device is used to store electric energy and release the stored electric energy when power supply is needed. Specifically, the energy storage device includes an energy storage component, an upper energy storage box body, a control and management system, and a lower energy storage box body. The lower energy storage box body and the upper energy storage box body jointly enclose a storage space, and the storage space is used to accommodate the energy storage component. The energy storage component has a first state for storing energy and a second state for releasing energy, and the control and management system is used to control the energy storage component to switch between the first state and the second state.

[0050] The existing energy storage lower box body includes a liquid cooling plate and a support frame. The support frame is composed of several support cross beams, support longitudinal beams, reinforcing beams and other components. In order to strengthen the structural strength of the existing energy storage lower box body, components such as the support cross beams, support longitudinal beams and reinforcing beams need to be welded and fixed to the liquid cooling plate to form an integral whole. Since components such as the support cross beams, support longitudinal beams and reinforcing beams are welded and fixed to the areas of the liquid cooling plate where the cooling channels are arranged respectively, when the existing energy storage lower box body is collided or impacted, components such as the support cross beams, support longitudinal beams and reinforcing beams will drive the parts of the liquid cooling plate fixed to the support cross beams, support longitudinal beams and reinforcing beams to move, generating different degrees of deviation, and then damaging the cooling channels in the liquid cooling plate, resulting in the scrapping of the existing energy storage lower box body.

[0051] To solve the above problems, as Figure 1 and Figure 2 shown, this embodiment provides an energy storage lower box body 1000. The energy storage lower box body 1000 includes a liquid cooling plate 100 and a bottom bracket 200. Among them, the bottom bracket 200 is used to support the liquid cooling plate 100. The liquid cooling plate 100 includes a first plate body 110 and a second plate body 120. The first plate body 110 is located above the second plate body 120. The first plate body 110 includes a central part 111 and an edge part 112 arranged on the periphery of the central part 111. The central part 111 is recessed downward relative to the edge part 112, so that the lower end surface of the first plate body 110 forms a first convex end surface. The second plate body 120 is provided with a downwardly recessed flow channel groove 121. The first convex end surface is hermetically fixed to the upper end surface of the second plate body 120. The first convex end surface and the flow channel groove 121 jointly enclose a cooling channel. The edge part 112 is fixedly connected to the bottom bracket 200.

[0052] The energy storage lower box body 1000 splits the first plate body 110 in the liquid cooling plate 100 into a central part 111 and an edge part 112 located on the periphery of the central part 111, makes the central part 111 recessed downward relative to the edge part 112, forms a first convex end surface on the lower end surface of the central part 111, combines with the opening of the downwardly recessed flow channel groove 121 on the upper end surface of the second plate body 120, and uses the hermetic fixation of the first convex end surface and the upper end surface of the second plate body 120 to make the first convex end surface and the flow channel groove 121 jointly enclose a cooling channel, so that the liquid cooling plate 100 has the liquid cooling and heat dissipation function. By fixedly connecting the edge part 112 to the bottom bracket 200 for supporting the liquid cooling plate 100, when the energy storage lower box body 1000 is collided or impacted, the bottom bracket 200 will drive the edge part 112 to move. However, since there is no cooling channel in the area where the edge part 112 is located, the deformation and deviation generated by the edge part 112 will not affect the normal use of the cooling channel, improving the protection of the cooling channel. By applying the above energy storage lower box body 1000, the service life of the energy storage lower box body 1000 is greatly improved, and then the service life of the energy storage device is improved.

[0053] It should be noted that in this embodiment, the liquid cooling plate 100 is made of an aluminum alloy material, and the first plate body 110 is formed by rolling, so that the central portion 111 is recessed downward relative to the edge portion 112. The aluminum alloy material has good thermal conductivity and ductility, which is convenient for rolling the first plate body 110 and improving the heat transfer efficiency between the subsequent first plate body 110 and the energy storage component.

[0054] In this embodiment, the liquid cooling plate 100 further includes two docking joints 130. One end of each docking joint 130 is fixedly connected to the end face of the central portion 111, and the other end of each docking joint 130 passes through the side wall of the central portion 111 in the up and down direction and is fixedly connected to the side wall. The flow-through channels 133 of each docking joint 130 are all communicated with the cooling flow channel, and the flow-through channels 133 of the two docking joints 130 are respectively communicated with the input end and the output end of the cooling circulation driving device. By arranging two docking joints 130 in the liquid cooling plate 100, one end of each docking joint 130 is fixedly connected to the end face of the central portion 111, and the other end of each docking joint 130 passes through the side wall of the central portion 111 in the up and down direction and is fixedly connected to the side wall, realizing the stable fixation of the docking joint 130 and the first plate body 110. By ensuring that the flow-through channels 133 in each docking joint 130 are all communicated with the cooling flow channel, and the flow-through channels 133 of the two docking joints 130 are respectively communicated with the input end and the output end of the cooling circulation driving device, the circulating flow of the cooling medium between the cooling circulation driving device and the cooling flow channel can be realized.

[0055] Specifically, any one of the two docking joints 130 is an inlet liquid docking joint, and the other is an outlet liquid docking joint. The inlet liquid docking joint is connected to the output end of the cooling circulation driving device, and the outlet liquid docking joint is connected to the input end of the cooling circulation driving device. The cooling medium that has absorbed heat in the cooling flow channel flows into the cooling circulation driving device along the outlet liquid docking joint. The cooling circulation driving device cools down the coolant that has absorbed heat, and then inputs the cooled cooling medium into the cooling flow channel along the inlet liquid docking joint to absorb the heat of the energy storage component again, realizing the circulating liquid cooling heat dissipation of the energy storage component.

[0056] Combined with Figure 3The specific structure of the docking joint 130 will be described. Each docking joint 130 includes a first fixing portion 131 and a second fixing portion 132. Among them, the first fixing portion 131 extends in the horizontal direction. The first fixing portion 131 passes through the side wall of the central portion 111 in the up-and-down direction and is welded and fixed to the side wall. The second fixing portion 132 is connected to one axial end of the first fixing portion 131. The second fixing portion 132 extends in the vertical direction and is welded and fixed to the upper end surface of the central portion 111. A first through hole extending along its axis is provided in the first fixing portion 131, and a second through hole extending along its axis is provided in the second fixing portion 132. The first through hole and the second through hole communicate with each other and form a flow-through channel 133. By splitting the docking joint 130 into a first fixing portion 131 extending in the horizontal direction and a second fixing portion 132 extending in the vertical direction, connecting the second fixing portion 132 to one axial end of the first fixing portion 131, setting the docking joint 130 into an L-shaped structure, passing the first fixing portion 131 through and welding and fixing it at the vertical side wall of the central portion 111, and welding and fixing the second fixing portion 132 to the upper end surface of the central portion 111, the flow-through channel 133 with an L-shaped structure is formed by the first through hole extending along the axis in the first fixing portion 131 and the second through hole extending along the axis in the second fixing portion 132, realizing the stable fixation of the docking joint 130 with an L-shaped flow-through channel 133 to the first plate body 110.

[0057] To further improve the welding efficiency between the docking joint 130 and the first plate body 110, a circumferentially extending welding ring 1311 is provided on the outer peripheral wall of the axial direction of the first fixing portion 131. The welding ring 1311 is welded and fixed to the side wall of the central portion 111. An axially outwardly extending annular plugging boss 1321 is provided on the end surface of the second fixing portion 132 axially away from the first fixing portion 131. The second through hole is located at the axial center of the annular plugging boss 1321. A plugging hole 1111 is provided in the central portion 111. The annular plugging boss 1321 is in plugging fit with the plugging hole 1111. The end surface of the second fixing portion 132 axially away from the first fixing portion 131 is welded and fixed to the upper end surface of the central portion 111. By providing a circumferentially extending welding ring 1311 on the outer peripheral wall of the axial direction of the first fixing portion 131 and making the welding ring 1311 abut against and be welded and fixed to the side wall of the central portion 111, the side walls of the first fixing portion 131 and the central portion 111 can be quickly positioned. By providing an annular plugging boss 1321 on the end surface of the second fixing portion 132 axially away from the first fixing portion 131 and making the annular plugging boss 1321 in plugging fit with the plugging hole 1111 at the central portion 111, the second fixing portion 132 and the central portion 111 can be quickly positioned, so as to realize the quick positioning and fixation of the docking joint 130 to the first plate body 110 and improve the subsequent welding efficiency between the docking joint 130 and the first plate body 110.

[0058] In addition, for the convenience of positioning and fixing the electrical components in the energy storage device within the lower energy storage box body 1000, the liquid cooling plate 100 further includes an electrical fixing frame 140. The electrical fixing frame 140 is fixedly connected to the upper end surface of the central portion 111 and is used for clamping and fixing the electrical device. It should be noted that in this embodiment, the liquid cooling plate 100 includes three electrical fixing frames 140. The three electrical fixing frames 140 are fixedly spaced along the longitudinal direction of the liquid cooling plate 100 on the upper end surface of the central portion 111, and each electrical fixing frame 140 is correspondingly arranged with an electrical component. In other embodiments, the specific number of the electrical fixing frames 140 can also be adjusted according to the specific number of the electrical components, and no specific limitation is made in this embodiment.

[0059] Combined with Figure 4 The specific structure of the bottom bracket 200 will be described. The bottom bracket 200 includes a support frame 210, a reinforcing beam 220, and a blind rivet 230. Among them, the support frame 210 is a rectangular frame structure, and the support frame 210 is fixedly connected to the edge portion 112. A plurality of reinforcing beams 220 are respectively fixed in the rectangular frame of the support frame 210 along the horizontal and vertical directions through the blind rivet 230. The reinforcing beam 220 is used to support the second plate body 120. By splitting the bottom bracket 200 into the support frame 210 and the reinforcing beam 220, and setting the support frame 210 as a rectangular frame structure and fixedly connecting the support frame 210 to the edge portion 112, the fixed connection between the liquid cooling plate 100 and the bottom bracket 200 is realized. By using the blind rivet 230 to fix a plurality of reinforcing beams 220 in the rectangular frame along the horizontal and vertical directions respectively, and supporting the second plate body 120 by the reinforcing beam 220, it is possible to improve the structural strength of the bottom bracket 200 while realizing the support for the liquid cooling plate 100 and enhancing the protection of the liquid cooling plate 100. It should be noted that the specific structure and fixing principle of the blind rivet 230 both belong to the prior art, and the specific structure and usage method of the blind rivet 230 will not be elaborated here.

[0060] Specifically, the support frame 210 includes two relatively arranged support cross beams 211 and two relatively arranged support longitudinal beams 212. Among them, each support cross beam 211 extends along the horizontal direction, and each support longitudinal beam 212 extends along the vertical direction. The two relatively arranged support cross beams 211 and the two relatively arranged support longitudinal beams 212 are welded and fixed together to jointly form a rectangular frame structure. It should be noted that in this embodiment, the support cross beam 211, the support longitudinal beam 212, and the reinforcing beam 220 are all made of aluminum alloy material. In other embodiments, the support cross beam 211, the support longitudinal beam 212, and the reinforcing beam 220 can also be made of other metal materials, and no specific limitation is made in this embodiment.

[0061] In an alternative embodiment, the lower energy storage box body 1000 further includes structural adhesive. Each upper end surface of the reinforcing beams 220 is covered with structural adhesive, and the structural adhesive fills the gap between the lower end surface of the second plate body 120 and the upper end surface of the reinforcing beam 220. By covering each upper end surface of the reinforcing beams 220 with structural adhesive, the structural adhesive is clamped in the gap between the upper end surface of the second plate body 120 and the upper end surface of the reinforcing beam 220, which can not only bond and fix the second plate body 120 above the reinforcing beam 220, but also provide buffering for the collision between the reinforcing beam 220 and the liquid cooling plate 100 under the working conditions of the lower energy storage box body 1000 being collided or impacted, further improving the protection of the liquid cooling plate 100. It should be noted that in this embodiment, the structural adhesive is made of polyurethane resin. In other embodiments, the structural adhesive can also be made of other resin materials, which is not specifically limited in this embodiment.

[0062] As Figure 1 shown, the lower energy storage box body 1000 further includes rivet nuts 300 and bolts 400. The rivet nuts 300 fixedly connect the edge portion 112 and the bottom bracket 200 from above, and the bolts 400 fixedly connect the edge portion 112 and the bottom bracket 200 from below, and the rivet nuts 300 and the bolts 400 do not interfere with each other. It should be noted that in this embodiment, the lower energy storage box body 1000 includes 62 rivet nuts 300 and 18 bolts 400. The 62 rivet nuts 300 fixedly connect the edge portion 112 with the support cross beam 211 and the support longitudinal beam 212 from above, and the 18 bolts 400 fixedly connect the edge portion 112 with the support cross beam 211 and the support longitudinal beam 212 from below. In other embodiments, the specific numbers of the rivet nuts 300 and the bolts 400 can also be adjusted according to actual needs. The specific structures and fixing principles of the rivet nuts 300 and the bolts 400 both belong to the prior art, and the specific structures and usage methods of the rivet nuts 300 and the bolts 400 will not be elaborated here.

[0063] In addition, in this embodiment, the lower energy storage box body 1000 further includes a foamed heat insulation layer, and the foamed heat insulation layer covers the lower part of the bottom bracket 200. By covering the lower part of the bottom bracket 200 with the foamed heat insulation layer, the overall heat insulation performance of the lower energy storage box body 1000 can be ensured, the generation of condensation on the lower energy storage box body 1000 can be reduced and lowered. In addition, the foamed heat insulation layer can also solve the problem of uneven temperature of the lower energy storage box body 1000. It should be noted that in this embodiment, the foamed heat insulation layer is a polyurethane foamed heat insulation layer. After the assembly and fixation of the bottom bracket 200 and the liquid cooling plate 100 are completed, the polyurethane foamed heat insulation layer is sprayed on the lower end surface of the bottom bracket 200.

[0064] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Energy storage lower box, characterized in that: include: Bottom bracket (200); A liquid cooling plate (100), wherein the bottom bracket (200) is used to support the liquid cooling plate (100), wherein the liquid cooling plate (100) comprises a first plate body (110) and a second plate body (120), wherein the first plate body (110) is located above the second plate body (120), wherein the first plate body (110) comprises a central portion (111) and an edge portion (112) arranged on the periphery of the central portion (111), wherein the central portion (111) is recessed downward relative to the edge portion (112) so that the lower end surface of the first plate body (110) forms a first convex end surface, and the second plate body (120) is provided with a downward recessed flow channel groove (121), wherein the first convex end surface is sealed and fixed to the upper end surface of the second plate body (120), and wherein the first convex end surface and the flow channel groove (121) together form a cooling flow channel; The edge portion (112) is fixedly connected to the bottom bracket (200).

2. The energy storage lower box according to claim 1, characterized in that: The liquid cooling plate (100) further comprises: Two butt joints (130), one end of each butt joint (130) is fixedly connected to the end face of the central portion (111), the other end of each butt joint (130) passes through the side wall of the central portion (111) in the up-down direction and is fixedly connected to the side wall, the flow passage (133) of each butt joint (130) is connected to the cooling flow channel, and the flow passages (133) of the two butt joints (130) are respectively connected to the input end and the output end of the cooling circulation drive device.

3. The energy storage lower box according to claim 2, characterized in that: Each of the butt joints (130) comprises: A first fixing portion (131), wherein the first fixing portion (131) extends in a horizontal direction. The first fixing portion (131) passes through the side wall of the central portion (111) along the up-down direction, and the first fixing portion (131) is fixed to the side wall by welding; and A second fixing portion (132) connected to one axial end of the first fixing portion (131), the second fixing portion (132) extending in a vertical direction, and the second fixing portion (132) being fixed to an upper end surface of the central portion (111) by welding; The first fixing portion (131) is provided with a first through hole extending along its axial direction, and the second fixing portion (132) is provided with a second through hole extending along its axial direction. The first through hole and the second through hole are in communication with each other and constitute the flow passage (133).

4. The energy storage lower box according to claim 3 is characterized in that: A circumferentially extending welding ring (1311) is provided on the axial outer peripheral wall of the first fixing portion (131), and the welding ring (1311) abuts against the side wall of the central portion (111) and is fixed by welding; The end face of the second fixing portion (132) axially away from the first fixing portion (131) is provided with an annular plug-in boss (1321) extending axially outward, the second through hole is located at the axial center of the annular plug-in boss (1321), the central portion (111) is provided with a plug-in hole (1111), the annular plug-in boss (1321) is plug-fitted with the plug-in hole (1111), and the end face of the second fixing portion (132) axially away from the first fixing portion (131) is welded and fixed to the upper end face of the central portion (111).

5. The energy storage lower box according to any one of claims 1 to 4, characterized in that: The liquid cooling plate (100) further comprises: An electrical fixing frame (140) is fixedly connected to the upper end surface of the central portion (111), and the electrical fixing frame (140) is used to clamp and fix electrical components.

6. The energy storage lower box according to any one of claims 1 to 4, characterized in that: The bottom bracket (200) comprises: A support frame (210), the support frame (210) being a rectangular frame structure, the support frame (210) being fixedly connected to the edge portion (112); A reinforcing beam (220) and a blind rivet (230), wherein a plurality of the reinforcing beams (220) are respectively fixed in the rectangular frame of the support frame (210) in the transverse direction and the longitudinal direction by means of the blind rivets (230), and the reinforcing beam (220) is used to support the second plate body (120).

7. The energy storage lower box according to claim 6, characterized in that: The energy storage lower box also includes: Structural adhesive, the upper end surface of each reinforcing beam (220) is covered with the structural adhesive, and the structural adhesive fills the gap between the lower end surface of the second plate body (120) and the upper end surface of the reinforcing beam (220).

8. The energy storage lower box according to any one of claims 1 to 4, characterized in that: The energy storage lower box also includes: A foam insulation layer, the foam insulation layer covers the bottom of the bottom bracket (200).

9. The energy storage lower box according to any one of claims 1 to 4, characterized in that: The energy storage lower box also includes: A blind rivet nut (300); and The bolt (400) fixes the edge portion (112) and the bottom bracket (200) from above, and the bolt (400) fixes the edge portion (112) and the bottom bracket (200) from below, and the rivet nut (300) and the bolt (400) do not interfere with each other.

10. An energy storage device, characterized in that It comprises an energy storage component, an upper energy storage box, a control management system and an energy storage lower box as claimed in any one of claims 1 to 9, wherein the lower energy storage box and the upper energy storage box together form a storage space, the storage space is used to accommodate the energy storage component, the energy storage component has a first state for storing energy and a second state for releasing energy, and the control management system is used to control the energy storage component to switch between the first state and the second state.

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