Energy storage device based on cylindrical battery

Abstract

The invention discloses an energy storage device based on a cylindrical battery. The energy storage device comprises a box body and an energy storage module installed in the box body. The energy storage module comprises at least one energy storage unit, each energy storage unit comprises at least one cylindrical energy storage monomer, and a central through hole is formed in each cylindrical energy storage monomer; when the energy storage unit comprises at least two cylindrical energy storage single bodies, every two adjacent cylindrical energy storage single bodies are connected in series, and the center through holes of every two adjacent cylindrical energy storage single bodies are communicated. The energy storage unit forms an inner flow channel through the center through hole, and an outer flow area located outside the energy storage unit is formed in the box body. A first liquid flow guiding assembly and a second liquid flow guiding assembly which are located at the two ends of the energy storage module and used for restraining the flowing direction of liquid flow in the inner flow channel and the outer flow channel are further arranged in the box body. According to the energy storage device based on the cylindrical battery, the central through holes of the cylindrical battery monomers are utilized to construct an internal flow channel so as to improve the heat dissipation effect, and the operation safety performance can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric energy storage, and specifically relates to an energy storage device based on cylindrical batteries. Background Art

[0002] During the working process of the battery, due to the existence of ohmic heat and polarization heat, there is a problem of heat generation, especially during the process of high current charging and discharging, the heat generation phenomenon is more obvious. If this heat cannot be diffused in time, it will accumulate inside the battery, which will increase the rate of side reactions at the battery interface on the one hand, and excessive heat accumulation may cause thermal runaway of the battery on the other hand. Therefore, efficient heat dissipation measures are issues that must be considered in battery design. In addition, in the prior art, in order to prevent the problem that the heat generated during the working process of the battery cannot be discharged in time, sufficient heat dissipation channels need to be reserved between the battery cells, resulting in a reduction in the volume energy density of the energy storage pack.

[0003] In existing energy storage devices, in order to discharge the heat in the battery in time, it is necessary to independently set up a cooling channel, fit the cooling channel with the battery surface, and use the liquid medium flowing in the cooling channel to discharge the battery heat. Although the heat dissipation effect can be improved to a certain extent, the cooling channel is only in contact with the battery surface, and the heat in the center of the battery still cannot be discharged in time. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an energy storage device based on a cylindrical battery, which utilizes the central through hole of the cylindrical battery cell to construct an internal flow channel to improve the heat dissipation effect and improve the operating safety performance.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An energy storage device based on a cylindrical battery comprises a box and an energy storage module installed in the box;

[0007] The energy storage module includes at least one energy storage unit, and the energy storage unit includes at least one cylindrical energy storage monomer, and the cylindrical energy storage monomer is provided with a central through hole; when the energy storage unit includes at least two cylindrical energy storage monomers, two adjacent cylindrical energy storage monomers are connected in series, and the central through holes of the two adjacent cylindrical energy storage monomers are connected;

[0008] When there are at least two energy storage units, the energy storage units are connected in series, in parallel or in mixed connection via connecting pieces arranged at both ends of the energy storage units;

[0009] The energy storage unit forms an inner flow channel through the central through hole, and an outer flow area outside the energy storage unit is formed in the box body; the box body is also provided with a first liquid flow guide component and a second liquid flow guide component respectively located at two ends of the energy storage module for restricting the flow direction of the liquid in the inner flow channel and the outer flow area;

[0010] The first liquid flow guiding component includes a first inner connecting cavity connected to the inner flow channel and a first outer connecting cavity connected to the outer flow area, and a first inner connecting pipe and a first outer connecting pipe are respectively provided in the first inner connecting cavity and the first outer connecting cavity; the second liquid flow guiding component includes a connecting cavity for connecting the inner flow channel and the outer flow area; or, the second liquid flow guiding component includes a second inner connecting cavity connected to the inner flow channel and a second outer connecting cavity connected to the outer flow area, and a second inner connecting pipe and a second outer connecting pipe are respectively provided in the second inner connecting cavity and the second outer connecting cavity.

[0011] Furthermore, a first pole and a second pole are respectively provided on the end surfaces of both ends of the cylindrical energy storage cell, and a first connecting structure and a second connecting structure that can cooperate with each other are respectively provided on the first pole and the second pole; when the energy storage unit includes at least two cylindrical energy storage cells, the first pole and the second pole of two adjacent cylindrical energy storage cells are connected in series through the first connecting structure and the second connecting structure.

[0012] Furthermore, in the cylindrical energy storage cell, the first pole and the second pole are both coaxially arranged with the central through hole, and the first pole and the second pole are respectively provided with a first through hole and a second through hole connected with the central through hole.

[0013] Furthermore, the first connection structure includes an internal thread provided on an inner wall of the first through hole, and the second connection structure includes an external thread provided on an outer wall of the second pole and matching with the internal thread.

[0014] Furthermore, the connecting sheet is provided with a connecting through hole corresponding to the energy storage unit;

[0015] When the connecting piece is connected to the first pole, a first connecting piece matched with the internal thread is used to connect the connecting piece and the first pole, and the first connecting piece includes an external thread section matched with the internal thread and a clamping end used to clamp and fix the connecting piece on the first pole, and a first connecting through hole connected with the first through hole is provided in the first connecting piece;

[0016] When the connecting piece is connected to the second pole, the connecting piece and the second pole are connected by a second connecting piece and a third connecting piece respectively matched with the external thread, and the connecting piece is pressed and fixed between the second connecting piece and the third connecting piece.

[0017] Further, the first liquid flow guide assembly includes a first inner plate, a first middle plate and a first outer plate which are parallel to each other, the first middle plate is located between the first inner plate and the first outer plate, and the first inner plate is located on a side of the first outer plate facing the energy storage module;

[0018] A first shell is disposed outside the first inner plate, the first middle plate and the first outer plate, and the first shell forms the first inner connecting cavity and the first outer connecting cavity between the first inner plate and the first middle plate and between the first middle plate and the first outer plate, respectively.

[0019] Furthermore, a first mounting through hole is provided on the first inner plate corresponding to the first pole or the second pole of each energy storage unit, the first inner plate is sleeved outside the first pole or the second pole of the energy storage unit through the first mounting through hole, and the connecting plate is located on the side of the first inner plate facing the first outer plate.

[0020] Furthermore, a first communication channel for connecting the outer flow area with the first outer communication cavity is arranged in an array between the first inner plate and the first middle plate.

[0021] Furthermore, the second liquid flow guiding component includes a connecting cavity for connecting the inner flow channel and the outer flow area, and the second liquid flow guiding component includes an inner connecting plate and an outer connecting plate, and the inner connecting plate is located on the side of the outer connecting plate facing the energy storage module; a connecting shell is provided outside the inner connecting plate and the outer connecting plate, and the connecting shell forms the connecting cavity between the inner connecting plate and the outer connecting plate.

[0022] Furthermore, the inner connecting plate is provided with mounting through holes corresponding to the first pole or the second pole of each energy storage unit, the inner connecting plate is sleeved outside the first pole or the second pole of the energy storage unit through the mounting through holes, and the connecting plate is located on the side of the inner connecting plate facing the outer connecting plate.

[0023] Further, the second liquid flow guide assembly comprises a second inner connecting cavity communicating with the inner flow channel and a second outer connecting cavity communicating with the outer flow area, and a second inner connecting pipe and a second outer connecting pipe are respectively disposed in the second inner connecting cavity and the second outer connecting cavity;

[0024] The second liquid flow guide assembly comprises a second inner plate, a second middle plate and a second outer plate which are parallel to each other, the second middle plate is located between the second inner plate and the second outer plate, and the second inner plate is located on a side of the second outer plate facing the energy storage module;

[0025] A second outer shell is disposed outside the second inner plate, the second middle plate and the second outer plate, and the second outer shell forms the second inner connecting cavity and the second outer connecting cavity between the second inner plate and the second middle plate and between the second middle plate and the second outer plate, respectively.

[0026] Furthermore, a second mounting through hole is provided on the second inner plate corresponding to the second pole or the second pole of each energy storage unit, the second inner plate is sleeved outside the first pole or the second pole of the energy storage unit through the second mounting through hole, and the connecting plate is located on the side of the second inner plate facing the second outer plate.

[0027] Furthermore, a second communication channel for connecting the outer flow area with the second outer communication cavity is arranged in an array between the second inner plate and the second middle plate.

[0028] Furthermore, a first inner confluence area connected to the first inner connecting pipe and a first inner diversion area connected to the inner flow channel are provided in the first inner connecting cavity, and a first inner diversion component for making the liquid flow evenly flow into or out of the first inner diversion area is provided between the first inner confluence area and the first inner diversion area.

[0029] Furthermore, a first external flow zone connected to the first external connecting pipe and a first external flow zone connected to the external flow zone are provided in the first external connecting cavity, and a first external flow diversion component for making the liquid flow evenly flow into or out of the first external flow diversion zone is provided between the first external flow zone and the first external flow diversion zone.

[0030] Furthermore, a second inner confluence area connected to the second inner connecting pipe and a second inner diversion area connected to the inner flow channel are provided in the second inner connecting cavity, and a second inner diversion component for making the liquid flow evenly flow into or out of the second inner diversion area is provided between the second inner confluence area and the second inner diversion area.

[0031] Furthermore, a second external flow zone connected to the second external connecting pipe and a second external flow zone connected to the external flow zone are provided in the second external connecting cavity, and a second external flow diversion component for making the liquid flow evenly flow into or out of the second external flow diversion zone is provided between the second external flow zone and the second external flow diversion zone.

[0032] Further, the box body includes an outer shell and an upper cover covering the outer shell, and the outer shell and the upper cover are tightly matched; or, the outer shell is provided with an airtight cover, whose two ends are respectively tightly connected to the first liquid flow guide component and the second liquid flow guide component and wrapped around the outside of the energy storage module.

[0033] Furthermore, the first liquid flow guide component is located below the energy storage module, the second liquid flow guide component is located above the energy storage module, and an exhaust hole is provided on the connecting cavity or the second outer connecting cavity.

[0034] Furthermore, a first support frame and a second support frame are respectively installed on the first liquid flow guide assembly and the second liquid flow guide assembly, and a connecting rod for fixing the energy storage module is arranged between the first support frame and the second support frame.

[0035] Furthermore, a guide plate is provided in the outer flow area, and a clearance hole is provided in the guide plate corresponding to the first pole or the second pole of each of the energy storage units. The guide plate is sleeved outside the first pole or the second pole of the energy storage unit through the clearance hole, and the guide plate is also provided with an array of flow holes for liquid flow to pass through.

[0036] Furthermore, annular protrusions are provided on both sides of the guide plate at the edges around the clearance through hole, and the thickness of the annular protrusions gradually increases along the direction pointing to the center of the corresponding clearance through hole.

[0037] The beneficial effects of the present invention are:

[0038] The energy storage device based on the cylindrical battery of the present invention, when constructing the energy storage unit, connects the adjacent cylindrical energy storage monomers in series and makes the central through holes of the cylindrical energy storage monomers communicate, so that the central through hole can be used to form an inner flow channel in the energy storage unit; an outer flow area located outside the energy storage monomer is formed in the box; by respectively arranging a first liquid flow guide component and a second liquid flow guide component at both ends of the energy storage module, a first inner connecting cavity and a first outer connecting cavity arranged in the first liquid flow guide component are respectively connected to the inner flow channel and the outer flow area;

[0039] When only a connecting cavity is provided in the second liquid flow guide component, the first internal connecting pipe can be used to inject liquid cooling medium into the first internal connecting cavity, and the liquid cooling medium enters the inner flow channel of each energy storage unit through the first internal connecting cavity, enters the outer flow area after passing through the connecting cavity, and then returns to the first outer connecting cavity, and then flows out through the first outer connecting pipe; of course, the first outer connecting pipe can also be used to inject liquid cooling medium into the first outer connecting cavity, and the liquid cooling medium enters the outer flow area through the first outer connecting cavity, enters the inner flow channel of each energy storage unit after passing through the connecting cavity, and then returns to the first inner connecting cavity, and then flows out through the first internal connecting pipe;

[0040] When the second liquid flow guide assembly is provided with a second inner connecting cavity and a second outer connecting cavity which are respectively connected to the inner flow channel and the outer flow area, an inner cooling flow channel connected to the inner flow channel can be formed between the first inner connecting cavity and the second inner connecting cavity, and an outer cooling flow channel connected to the outer flow area can be formed between the first outer connecting cavity and the second outer connecting cavity. In this way, the heat inside and outside each cylindrical energy storage unit can be taken away by the liquid cooling medium in the inner cooling flow channel and the outer cooling flow channel respectively.

[0041] In summary, the energy storage device based on cylindrical batteries of the present invention constructs an inner flow channel within the energy storage cell by utilizing the central through hole of the cylindrical energy storage cell, and combines the outer flow area outside the energy storage cell. The heat generated during the charging and discharging of the cylindrical energy storage cell can be taken away by liquid cooling medium in the inner flow channel and the outer flow area at the same time, thereby effectively improving the heat dissipation performance. During the operation of the energy storage module, the liquid cooling medium in the inner flow channel and the outer flow area forms an immersion effect on each cylindrical energy storage cell, thereby further improving the operation safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0043] Figure 1 This is a schematic structural diagram of Example 1 of an energy storage device based on a cylindrical battery according to the present invention;

[0044] Figure 2 for Figure 1 AA section view;

[0045] Figure 3 for Figure 1 BB cross-sectional view;

[0046] Figure 4 for Figure 3 CC section view;

[0047] Figure 5 for Figure 3 DD cross-sectional view;

[0048] Figure 6 for Figure 3 EE cross-sectional view;

[0049] Figure 7 for Figure 2 A magnified view of the F1 region;

[0050] Figure 8 for Figure 3 A magnified image of the F2 region;

[0051] Fig. 9 It is a structural schematic diagram of the energy storage module;

[0052] Fig.10 for Fig. 9 A magnified view of the G region;

[0053] Fig.11 for Fig. 9 A magnified view of the H region;

[0054] Fig.12 for Fig. 9 A magnified view of region I;

[0055] Fig.13 Schematic diagram of the structure of a cylindrical energy storage monomer;

[0056] Fig.14 This is a schematic diagram of the structure of the cylindrical battery-based energy storage device of this embodiment after the outer shell and the upper cover are hidden;

[0057] Fig.15 It is a three-dimensional diagram of the energy storage module;

[0058] Fig.16 Temperature distribution of solid and fluid domains in the cross section of the energy storage device along the column direction; (a) solid domain; (b) fluid domain;

[0059] Fig.17 Velocity cloud diagram and vector diagram on the cross section of the energy storage device along the column direction; (a) velocity cloud diagram; (b) vector diagram;

[0060] Fig.18 Temperature distribution of solid and fluid domains in the cross section of the energy storage device along the row direction; (a) solid domain; (b) fluid domain;

[0061] Fig.19 Temperature distribution of solid and fluid domains in the cross section of the energy storage device along the layer direction; (a) solid domain; (b) fluid domain;

[0062] Fig. 20 Velocity cloud diagram and vector diagram on the cross section of the energy storage device along the layer direction; (a) velocity cloud diagram; (b) vector diagram;

[0063] Fig.21 The temperature and velocity distribution in the first external connecting cavity; (a) temperature distribution; (b) velocity distribution;

[0064] Fig. 22 This is a schematic structural diagram of Example 2 of an energy storage device based on a cylindrical battery according to the present invention;

[0065] Fig.23 for Fig. 22 JJ sectional view;

[0066] Fig.24 for Fig. 22 KK cross-sectional view;

[0067] Fig.25 for Fig.24 A magnified view of the L region;

[0068] Fig.26 for Fig.24 MM cross-sectional view;

[0069] Fig. 27 for Fig.24 NN cross-sectional view;

[0070] Fig.28 Temperature distribution of solid and fluid domains in the cross section of the energy storage device along the column direction; (a) solid domain; (b) fluid domain;

[0071] Fig.29 Velocity cloud diagram and vector diagram on the cross section of the energy storage device along the column direction; (a) velocity cloud diagram; (b) vector diagram;

[0072] Fig.30 Temperature distribution of solid and fluid domains in the cross section of the energy storage device along the row direction; (a) solid domain; (b) fluid domain;

[0073] Fig.31 Temperature distribution of solid and fluid domains in the cross section of the energy storage device along the layer direction; (a) solid domain; (b) fluid domain;

[0074] Fig.32 Velocity cloud diagram and vector diagram on the cross section of the energy storage device along the layer direction; (a) velocity cloud diagram; (b) vector diagram;

[0075] Fig.33 Temperature and velocity distribution in the first external connecting cavity; (a) temperature distribution; (b) velocity distribution.

[0076] Description of reference numerals:

[0077] 100-box; 101-housing; 102-upper cover; 103-sealed cover; 104-exhaust hole; 105-first support frame; 106-second support frame; 107-connecting rod; 110-first liquid flow guide assembly; 111-first inner connecting cavity; 112-first outer connecting cavity; 113-first inner connecting pipe; 114-first outer connecting pipe; 115-first inner side plate; 116-first middle plate; 117 - first outer plate; 118 - first outer shell; 119 - first mounting through hole; 120 - first connecting channel; 121 - inner plate through hole; 122 - middle plate through hole; 123 - first inner confluence area; 124 - first inner flow diversion area; 125 - first inner flow diversion component; 126 - first inner connecting gap; 127 - first outer flow diversion area; 128 - first outer flow diversion area; 129 - first outer flow diversion component; 130 - first outer connecting gap;

[0078] 140-second liquid flow guide assembly; 141-connecting cavity; 142-internal connecting plate; 143-external connecting plate; 144-connecting shell; 145-installing through hole; 146-second internal connecting cavity; 147-second external connecting cavity; 148-second internal connecting pipe; 149-second external connecting pipe; 150-second inner plate; 151-second middle plate; 152-second outer plate; 153-second shell; 154-second installing through hole; 155-second connecting channel; 156-second inner plate through hole; 157-second middle plate through hole; 158-second inner confluence area; 159-second inner diversion area; 160-second inner diversion assembly; 161-second inner connecting notch; 162-second outer diversion area; 163-second outer diversion area; 164-second outer diversion assembly; 165-second outer connecting notch;

[0079] 200-energy storage module; 210-energy storage unit; 211-cylindrical energy storage monomer; 212-center through hole; 213-first pole; 214-second pole; 215-first through hole; 216-second through hole; 217-connecting through hole; 218-first connecting piece; 218a-external thread section; 218b-pressing end; 219-first connecting through hole; 220-second connecting piece; 221-third connecting piece; 222-inner flow channel; 223-outer flow area; 224-guide plate; 225-gap through hole; 226-flow hole; 227-annular protrusion; 228-connecting piece. DETAILED DESCRIPTION

[0080] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0081] Example 1

[0082] like Figure 1 As shown, the energy storage device based on cylindrical batteries in this embodiment includes a box body 100 and an energy storage module 200 installed in the box body.

[0083] like Figure 9-15As shown, the energy storage module of this embodiment includes at least one energy storage unit 210, and the energy storage unit 210 includes at least one cylindrical energy storage monomer 211, and a central through hole 212 is provided in the cylindrical energy storage monomer 211, and a first pole 213 and a second pole 214 are respectively provided on the end surfaces of both ends of the cylindrical energy storage monomer 211, and a first connection structure and a second connection structure that can cooperate with each other are respectively provided on the first pole 213 and the second pole 214. In the cylindrical energy storage monomer 211 of this embodiment, the first pole 213 and the second pole 214 are both coaxially arranged with the central through hole 212, and the first pole 213 and the second pole 214 are respectively provided with a first through hole 215 and a second through hole 216 that are connected to the central through hole 212. Based on this structure, the first connection structure of this embodiment includes an internal thread provided on the inner wall of the first through hole 215, and the second connection structure includes an external thread provided on the outer wall of the second pole 214 that can cooperate with the internal thread. In this way, when the energy storage unit 210 includes at least two cylindrical energy storage monomers 211, the two adjacent cylindrical energy storage monomers 211 are connected in series, and the central through holes 212 of the two adjacent cylindrical energy storage monomers 211 are connected. Specifically, in this embodiment, the first pole 213 and the second pole 214 of the two adjacent cylindrical energy storage monomers 211 are connected in series through the first connection structure and the second connection structure, and the central through holes 212 of the two adjacent cylindrical energy storage monomers 211 are connected. That is, in this embodiment, the two cylindrical energy storage units 211 belonging to the same energy storage unit 210 are threadedly connected and matched through the internal thread respectively arranged on the inner wall of the first through hole 215 of one of the cylindrical energy storage monomers 211 and the external thread respectively arranged on the outer wall of the second pole 214 of the other cylindrical energy storage monomer 211, and the central through holes 212 of the two cylindrical energy storage monomers 211 are connected. Specifically, in this embodiment, each energy storage unit 210 includes three cylindrical energy storage monomers 211, and the three cylindrical energy storage monomers 211 are connected in series. Of course, in some other implementations, only one cylindrical energy storage cell 211 may be provided in each energy storage unit 210 , or two, four or more cylindrical energy storage cells 211 may be provided, which will not be described in detail.

[0084] Specifically, when there are at least two energy storage units 210, the spacing between the central axes of two adjacent energy storage units 210 is greater than the outer diameter of the cylindrical energy storage unit 211, so as to avoid contact between the outer shells of the cylindrical energy storage unit 211, and the energy storage units 210 are connected in series, in parallel, or in a mixed connection via connecting pieces 228 provided at both ends thereof. That is, according to the design requirements for the output voltage and current of the energy storage device, the energy storage units 210 can be connected in series, in parallel, or in a mixed connection via the connecting piece 228, which will not be repeated here. Specifically, in order to prevent the connecting piece 228 from blocking the central through hole 212, the present embodiment is provided with a connecting through hole 217 on the connecting piece 228 and the corresponding energy storage unit 210. Specifically, as Fig.10 As shown, when the connecting piece 228 is connected to the first pole 213, the first connecting member 218 matched with the internal thread is used to connect and fix the connecting piece 228 to the first pole 213. At this time, the inner diameter of the connecting through hole 217 corresponding to the connecting piece 228 and the first pole 213 is greater than or equal to the inner diameter of the first through hole 215 and smaller than the outer diameter of the first pole 213. In this way, the first connecting member 218 of this embodiment includes an external thread section 218a matched with the internal thread and a pressing end 218b for pressing and fixing the connecting piece 228 on the first pole 213. The first connecting member 218 is provided with a first connecting through hole 219 connected with the first through hole 215. In this way, the connecting piece 228 and the first connecting member 218 can be prevented from blocking the internal flow channel. When the connecting piece 228 is connected to the second pole 214, the second connecting piece 220 and the third connecting piece 221 respectively matched with the external thread are used to realize the connection between the connecting piece 228 and the second pole 214. At this time, the inner diameter of the connecting through hole 217 corresponding to the connecting piece 228 and the second pole 214 is greater than or equal to the outer diameter of the second pole 214, and the connecting piece 228 is pressed and fixed between the second connecting piece 220 and the third connecting piece 221. Fig.11 As shown. The energy storage device of this embodiment includes 40 energy storage units 210, and the 40 energy storage units 210 are arranged in a rectangular array of 4 times 10. Of course, in some other embodiments, the number of energy storage units 210 can be set according to actual use requirements, such as the number of energy storage units 210 can be set to 1, 2, ..., 41 or more.

[0085] like Figure 2-8 As shown, the energy storage unit 210 of this embodiment forms an inner flow channel 222 through the central through hole 212, and an outer flow area 223 located outside the energy storage unit 210 is formed in the box 100. The box 100 of this embodiment is also provided with a first liquid flow guide assembly 110 and a second liquid flow guide assembly 140 located at both ends of the energy storage module 200 for restricting the flow direction of the liquid in the inner flow channel 222 and the outer flow area 223. Figure 7-8As shown, in this embodiment, the first liquid flow guiding component 110 includes a first inner connecting cavity 111 communicating with the inner flow channel 222 and a first outer connecting cavity 112 communicating with the outer flow area 223, and a first inner connecting pipe 113 and a first outer connecting pipe 114 are respectively provided in the first inner connecting cavity 111 and the first outer connecting cavity 112. The second liquid flow guiding component 140 of this embodiment includes a connecting cavity 141 for connecting the inner flow channel 222 and the outer flow area 223. During use, the first inner connecting pipe 113 can be used as a liquid inlet pipe, and the first outer connecting pipe 114 can be used as a liquid return pipe, so that the liquid flows into the inner flow channel 222 through the first inner connecting pipe 113 and then enters the connecting cavity 141, and then flows out through the first outer connecting pipe 114 after entering the outer flow area 223 through the connecting cavity 141. Of course, the first inner connecting pipe 113 can also be used as a liquid outlet pipe, and the first outer connecting pipe 114 can be used as a liquid inlet pipe. In this way, the liquid flows through the first outer connecting pipe 114 into the outer flow area 223 and then flows into the connecting cavity 141, and then flows out of the first inner connecting pipe 113 through the inner flow channel 222.

[0086] In the preferred implementation of this embodiment, a guide plate 224 is provided in the outer flow area 223, and a clearance hole 225 is provided in the guide plate 224 corresponding to the first pole 213 or the second pole 214 of each energy storage unit 210. The guide plate 224 is sleeved outside the first pole 213 or the second pole 214 of the energy storage unit 210 through the clearance hole 225, and the guide plate 224 is also provided with an array of flow holes 226 for liquid flow to pass through, and the liquid flow in the outer flow area 223 is guided by the flow holes 226, and the flow velocity of the liquid flow in the outer flow area 223 is made more uniform. The two sides of the guide plate 224 of this embodiment are provided with annular protrusions 227 at the edges around the clearance hole 225, and the thickness of the annular protrusions 227 gradually increases along the direction pointing to the center of the corresponding clearance hole 225.

[0087] Specifically, Figure 7-8As shown, the first liquid flow guide assembly 110 of this embodiment includes a first inner plate 115, a first middle plate 116 and a first outer plate 117 which are parallel to each other. The first middle plate 116 is located between the first inner plate 115 and the first outer plate 117. The first inner plate 115 is located on the side of the first outer plate 117 facing the energy storage module 200. Specifically, the first inner plate 115, the first middle plate 116 and the first outer plate 117 are provided with a first outer shell 118. The first outer shell 118 forms a first inner connecting cavity 111 and a first outer connecting cavity 112 between the first inner plate 115 and the first middle plate 116 and between the first middle plate 116 and the first outer plate 117, respectively. In this embodiment, the first outer shell 118 is provided in two sections, wherein one section of the first outer shell 118 is located between the first inner plate 115 and the first middle plate 116 and is provided as a whole with the first middle plate 116, and the first inner plate 115 covers the first outer shell 118. Another section of the first shell 118 is located between the first middle plate 116 and the first outer plate 117 and is integrated with the first outer plate 117, and the first middle plate 116 covers the section of the first shell 118. Of course, in some other embodiments, the first shell 118 can also be set as one section and integrated with the first outer plate 117, the first middle plate 116 is fixedly installed in the middle of the first shell 118, and the first inner plate 115 is covered on the first shell 118, which will not be repeated. The first inner plate 115 of this embodiment is provided with a first mounting through hole 119 corresponding to the first pole 213 or the second pole 214 of each energy storage unit 210, and the first inner plate 115 is sleeved on the outside of the first pole 213 or the second pole 214 of the energy storage unit 210 through the first mounting through hole 119, and the connecting piece 228 is located on the side of the first inner plate 115 facing the first outer plate 117. In this embodiment, a first connecting channel 120 for connecting the outer flow area 223 with the first outer connecting cavity 112 is arranged in an array between the first inner plate 115 and the first middle plate 116. The first inner plate 115 and the first middle plate 116 are respectively provided with inner plate through holes 121 and middle plate through holes 122 corresponding to the first connecting channel 120. In this way, the first outer connecting cavity 112 can be connected with the outer flow area 223 through the first connecting channel 120. In a preferred implementation of the present embodiment, a first inner confluence area 123 communicating with the first inner connecting pipe 113 and a first inner flow diversion area 124 communicating with the inner flow channel 222 are provided in the first inner connecting cavity 111, and a first inner flow diversion component 125 for making the liquid flow evenly flow into or out of the first inner flow diversion area 124 is provided between the first inner confluence area 123 and the first inner flow diversion area 124, and a first inner connecting notch 126 communicating with the first inner confluence area 123 and the first inner flow diversion area 124 is provided at intervals on the first inner flow diversion component 125, such as Figure 5As shown, in this way, the flow rate of the liquid flow can be made more uniform in different inner flow channels 222, thereby improving the temperature uniformity effect. In a preferred implementation of this embodiment, a first external connecting cavity 112 is provided with a first external external flow area 127 connected to the first external connecting pipe 114 and a first external flow area 128 connected to the external flow area 223, and a first external flow diversion component 129 is provided between the first external flow area 127 and the first external flow diversion area 128 for making the liquid flow flow uniformly into or out of the first external flow diversion area 128. The first external flow diversion component 129 of this embodiment is provided with a first external connecting notch 130 connecting the first external flow area 127 and the first external flow diversion area 128 at intervals, as shown in FIG. Figure 6 As shown, in this way, the liquid flow can be more evenly distributed in the outer flow area 223, thereby improving the temperature uniformity effect.

[0088] like Figure 2-3 As shown, the second liquid flow guide assembly 140 of this embodiment includes a connecting cavity 141 for connecting the inner flow channel 222 and the outer flow area 223, and the second liquid flow guide assembly 140 includes an inner connecting plate 142 and an outer connecting plate 143, and the inner connecting plate 142 is located on the side of the outer connecting plate 143 facing the energy storage module 200. A connecting shell 144 is provided outside the inner connecting plate 142 and the outer connecting plate 143, and the connecting shell 144 forms a connecting cavity 141 between the inner connecting plate 142 and the outer connecting plate 143. The connecting shell 114 of this embodiment is integrated with the inner connecting plate 142, and the outer connecting plate 143 covers the connecting shell 114. In this embodiment, the inner connecting plate 142 is provided with a mounting through hole 145 corresponding to the first pole 213 or the second pole 214 of each energy storage unit 210. The inner connecting plate 142 is sleeved outside the first pole 213 or the second pole 214 of the energy storage unit 210 through the mounting through hole 145, and the connecting piece 228 is located on the side of the inner connecting plate 142 facing the outer connecting plate 143.

[0089] Specifically, the housing 100 of the present embodiment includes a housing 101 and an upper cover 102 covering the housing 101. The housing 101 and the upper cover 102 of the present embodiment are tightly matched, so that an outer flow area 223 can be formed outside the energy storage unit 210 of the energy storage module 200. Of course, in some other embodiments, a closed cover 103 can also be provided in the housing 101, the two ends of which are tightly connected to the first liquid flow guide assembly 110 and the second liquid flow guide assembly 140 respectively and wrapped outside the energy storage module 200. In the present embodiment, the first liquid flow guide assembly 110 is located below the energy storage module 200, the second liquid flow guide assembly 140 is located above the energy storage module 200, and the connecting cavity 141 is provided with an exhaust hole 104. Specifically, the exhaust hole 104 of the present embodiment is provided on the outer connecting plate 143. The exhaust hole 104 discharges the gas generated during the operation of the energy storage module 200 out of the housing 100.

[0090] The first liquid flow guide assembly 110 and the second liquid flow guide assembly 140 are also respectively mounted with a first support frame 105 and a second support frame 106, and a connecting rod 107 for fixing the energy storage module 200 is arranged between the first support frame 105 and the second support frame 106 to improve the overall structural strength of the energy storage module 200. In this embodiment, the first support frame 105 and the connecting shell 144 are integrated, and the second support frame 106 and the first shell 118 are separately arranged.

[0091] In the energy storage device based on cylindrical batteries in this embodiment, the energy storage module includes 4 rows and 10 columns of energy storage units 210, each of which includes 3 cylindrical energy storage cells 211, that is, the energy storage module has a three-layer structure. The capacity of the energy storage device is 70Ah, and the density of the cylindrical energy storage cell is 2000kg / m 3 , specific heat capacity 1000J / (kg·K), thermal conductivity is anisotropic: radial is 1W / (m·K), axial and tangential are 20W / (m·K), the heat generation power of the cylindrical energy storage unit is constant at 7W, the flow rate of the liquid inlet pipe is 1m / s, the liquid inlet temperature is 20℃, the return liquid pressure is 0, the starting temperature is 20℃, the energy storage device is fully charged and discharged at 0.5C, and the temperature and liquid flow rate of the energy storage device are simulated, such as Figure 17-21 The simulation results show that the energy storage device based on the cylindrical battery in this embodiment can give full play to the unique advantage that the liquid temperature control medium can flow through the inside of the cylindrical energy storage unit, which can not only effectively control the temperature rise, but also achieve a maximum temperature difference of 2-3°C in the entire energy storage device in terms of temperature consistency.

[0092] Example 2

[0093] like Figure 22-27As shown, the energy storage device based on the cylindrical battery of this embodiment includes a box body 100 and an energy storage module 200 installed in the box body. The energy storage module 200 of this embodiment includes at least one energy storage unit 210, and the energy storage unit 210 includes at least one cylindrical energy storage monomer 211, and a central through hole 212 is provided in the cylindrical energy storage monomer 211. When the energy storage unit 210 includes at least two cylindrical energy storage monomers 211, the two adjacent cylindrical energy storage monomers 211 are connected in series, and the central through holes 212 of the two adjacent cylindrical energy storage monomers 211 are connected. When the energy storage unit 210 is set to at least two, the spacing between the central axes of the two adjacent energy storage units 210 is greater than the outer diameter of the cylindrical energy storage monomer 211 to avoid contact between the outer shells of the cylindrical energy storage monomers 211 of the adjacent energy storage units 210. The energy storage units 210 are connected in series, in parallel, or in mixed connection through the connecting pieces 228 arranged at both ends thereof. The energy storage unit 210 forms an inner flow channel 222 through the central through hole 211, and an outer flow area 223 located outside the energy storage unit 210 is formed in the box 100. The box 100 is also provided with a first liquid flow guide assembly 110 and a second liquid flow guide assembly 140 respectively located at both ends of the energy storage module for restricting the flow direction of the liquid in the inner flow channel and the outer flow area.

[0094] In this embodiment, the first liquid flow guiding assembly 110 includes a first inner communicating cavity 111 communicating with the inner flow channel 222 and a first outer communicating cavity 112 communicating with the outer flow area 223, and a first inner connecting pipe 113 and a first outer connecting pipe 114 are respectively provided in the first inner communicating cavity 111 and the first outer communicating cavity 112. The second liquid flow guiding assembly 140 in this embodiment includes a second inner communicating cavity 146 communicating with the inner flow channel 222 and a second outer communicating cavity 147 communicating with the outer flow area 223, and a second inner connecting pipe 148 and a second outer connecting pipe 149 are respectively provided in the second inner communicating cavity 146 and the second outer communicating cavity 147. In this way, an inner cooling channel connected to the inner flow channel 222 can be formed between the first inner connecting cavity 111 and the second inner connecting cavity 146, and the liquid inlet pipe of the inner cooling channel can be the first inner connecting pipe 113, and the liquid outlet pipe can be the second inner connecting pipe 148; of course, in some other embodiments, the liquid inlet pipe of the inner cooling channel can also be the second inner connecting pipe 148, and the liquid outlet pipe can also be the first inner connecting pipe 113. An outer cooling channel connected to the outer flow area 223 is formed between the first outer connecting cavity 112 and the second outer connecting cavity 147, and the liquid inlet pipe of the outer cooling channel can be the first outer connecting pipe 114, and the liquid outlet pipe can be the second outer connecting pipe 149; of course, in some other embodiments, the liquid inlet pipe of the outer cooling channel can also be the second outer connecting pipe 149, and the liquid outlet pipe can also be the first outer connecting pipe 114.

[0095] Specifically, the first liquid flow guide assembly 110 of this embodiment includes a first inner plate 115, a first middle plate 116 and a first outer plate 117 which are parallel to each other. The first middle plate 116 is located between the first inner plate 115 and the first outer plate 117. The first inner plate 115 is located on the side of the first outer plate 117 facing the energy storage module 200. Specifically, the first inner plate 115, the first middle plate 116 and the first outer plate 117 are provided with a first outer shell 118. The first outer shell 118 forms a first inner connecting cavity 111 and a first outer connecting cavity 112 between the first inner plate 115 and the first middle plate 116 and between the first middle plate 116 and the first outer plate 117, respectively. In this embodiment, the first inner plate 115 is provided with a first mounting through hole 119 corresponding to the first pole 213 or the second pole 214 of each energy storage unit 210. The first inner plate 115 is sleeved outside the first pole 213 or the second pole 214 of the energy storage unit 210 through the first mounting through hole 119, and the connecting piece 228 is located on the side of the first inner plate 115 facing the first outer plate 117. In this embodiment, a first connecting channel 120 for connecting the outer flow area 223 with the first outer connecting cavity 112 is arranged in an array between the first inner plate 115 and the first middle plate 116. The first inner plate through hole 121 and the first middle plate through hole 122 are respectively provided on the first inner plate 115 and the first middle plate 116 corresponding to the first connecting channel 120. In this way, the first outer connecting cavity 112 can be connected with the outer flow area 223 through the first connecting channel 120. In a preferred implementation of the present embodiment, a first inner converging area 123 connected to the first inner connecting pipe 113 and a first inner diverting area 124 connected to the inner flow channel 222 are provided in the first inner connecting cavity 111, and a first inner diverting component 125 for making the liquid flow evenly flow into or out of the first inner diverting area 124 is provided between the first inner converging area 123 and the first inner diverting area 124, and first inner connecting notches 126 connecting the first inner converging area 123 and the first inner diverting area 124 are arranged at intervals on the first inner diverting component 125. In this way, the flow rate of the liquid can be made more uniform in different inner flow channels 222, thereby improving the temperature equalization effect. In a preferred implementation of the present embodiment, a first external connecting cavity 112 is provided with a first external external flow zone 127 connected to the first external connecting pipe 114 and a first external flow zone 128 connected to the external flow zone 223, and a first external flow diversion component 129 is provided between the first external flow zone 127 and the first external flow diversion component 128 for making the liquid flow evenly flow into or out of the first external flow diversion component 128. The first external connecting notches 130 connecting the first external flow zone 127 and the first external flow diversion component 128 are arranged at intervals on the first external flow diversion component 129 of the present embodiment. In this way, the liquid flow can be more evenly distributed in the external flow zone 223, thereby improving the temperature equalization effect.

[0096] Specifically, Figure 18-21As shown, the second liquid flow guide assembly 140 includes a second inner plate 150, a second middle plate 151 and a second outer plate 152 which are parallel to each other. The second middle plate 151 is located between the second inner plate 150 and the second outer plate 152. The second inner plate 150 is located on the side of the second outer plate 152 facing the energy storage module 200. The second inner plate 150, the second middle plate 151 and the second outer plate 152 are provided with a second outer shell 153. The second outer shell 153 forms a second inner connecting cavity 146 and a second outer connecting cavity 147 between the second inner plate 150 and the second middle plate 151 and between the second middle plate 151 and the second outer plate 152, respectively. The second outer shell 153 of this embodiment is divided into two sections, wherein one section of the second outer shell 153 is located between the second inner plate 150 and the second middle plate 151 and is integrated with the second middle plate 151, and the second inner plate 150 covers the second outer shell 153. Another section of the second outer shell 153 is located between the second middle plate 151 and the second outer plate 152 and is integrated with the second middle plate 151, and the second outer plate 152 covers the section of the second outer shell 153. Specifically, the second inner plate 150 is provided with a second mounting through hole 154 corresponding to the second pole 213 or the second pole 214 of each energy storage unit 210, and the second inner plate 150 is sleeved outside the second pole 213 or the second pole 214 of the energy storage unit 210 through the second mounting through hole 154, and the connecting piece 228 is located on the side of the second inner plate 150 facing the second outer plate 152. Specifically, a second connecting channel 155 for connecting the outer flow area 223 with the second outer connecting cavity 147 is arranged in an array between the second inner plate 150 and the second middle plate 151. Specifically, a second inner plate through hole 156 and a second middle plate through hole 157 are arranged on the second inner plate 150 and the second middle plate 151 corresponding to the second connecting channel 155. In this way, the second outer connecting cavity 147 can be connected with the outer flow area 223 through the second connecting channel 155.

[0097] In a preferred implementation of the present embodiment, a second inner confluence area 158 communicating with the second inner connecting pipe 148 and a second inner flow diversion area 159 communicating with the inner flow channel 222 are provided in the second inner connecting cavity 146, and a second inner flow diversion component 160 for making the liquid flow evenly flow into or out of the second inner flow diversion area 159 is provided between the second inner confluence area 158 and the second inner flow diversion area 159. Specifically, a second inner connecting notch 161 connecting the second inner confluence area 158 and the second inner flow diversion area 159 is provided at intervals on the second inner flow diversion component 160. In a preferred implementation of the present embodiment, a second outer flow diversion area 162 communicating with the second outer connecting pipe 149 and a second outer flow diversion area 163 communicating with the outer flow area 223 are provided in the second outer connecting cavity 147, and a second outer flow diversion component 164 for making the liquid flow evenly flow into or out of the second outer flow diversion area 163 is provided between the second outer flow diversion area 162 and the second outer flow diversion area 163. Specifically, the second external flow splitting component 164 is provided with second external connecting notches 165 connecting the second external flow splitting area 162 and the second external flow splitting area 163 at intervals.

[0098] Specifically, the box body 100 of the present embodiment includes an outer shell 101 and an upper cover 102 covering the outer shell 101. In the present embodiment, a closed cover 103 is arranged in the outer shell 101, and the two ends of the closed cover 103 are respectively connected to the first liquid flow guide component 110 and the second liquid flow guide component 140 and wrapped around the outside of the energy storage module 200. The closed cover 103 forms an outflow area 223 located outside the energy storage unit 210 in the energy storage device 200.

[0099] In this embodiment, the first liquid flow guide assembly 110 is located below the energy storage module 200, the second liquid flow guide assembly 140 is located above the energy storage module 200, and the second external communication cavity 147 is provided with an exhaust hole 104. Specifically, the exhaust hole 104 of this embodiment is arranged on the second outer plate 152. The exhaust hole 104 discharges the gas generated during the operation of the energy storage module 200 out of the box body 100. In this embodiment, the second internal connecting pipe 148 and the second external connecting pipe 149 both extend to the bottom of the energy storage module 200, so that liquid inlet and outlet can be achieved on the same side of the energy storage module 200.

[0100] The other implementations of this embodiment are the same as those of Embodiment 1 and are not described one by one.

[0101] In this embodiment, the “liquid flow” is formed by a liquid temperature control medium in the corresponding inner flow channel 222 and outer flow channel 223 , and the liquid temperature control medium is made of an insulating liquid material (such as fluorinated liquid).

[0102] In the energy storage device based on cylindrical batteries in this embodiment, the energy storage module includes 4 rows and 10 columns of energy storage units 210, each of which includes 3 cylindrical energy storage cells 211, that is, the energy storage module is a three-layer structure, in which the first row and the first column have no energy storage units. The capacity of the energy storage device is 70Ah, and the density of the cylindrical energy storage cell is 2000kg / m 3 , specific heat capacity 1000J / (kg·K), thermal conductivity is anisotropic: radial is 1W / (m·K), axial and tangential are 20W / (m·K), the heat generation power of the cylindrical energy storage unit is constant at 7W, the flow rate of the liquid inlet pipe is 1m / s, the liquid inlet temperature is 20℃, the return liquid pressure is 0, the starting temperature is 20℃, the energy storage device is fully charged and discharged at 0.5C, and the temperature and liquid flow rate of the energy storage device are simulated, such as Figure 28-33 The simulation results show that the energy storage device based on the cylindrical battery in this embodiment can give full play to the unique advantage that the liquid temperature control medium can flow through the inside of the cylindrical energy storage unit, which can not only effectively control the temperature rise, but also can achieve the temperature consistency within 0.5°C in the entire energy storage device.

[0103] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. An energy storage device based on cylindrical batteries, Features: It includes a box body and an energy storage module installed in the box body; The energy storage module includes at least one energy storage unit, and the energy storage unit includes at least one cylindrical energy storage monomer, and the cylindrical energy storage monomer is provided with a central through hole; when the energy storage unit includes at least two cylindrical energy storage monomers, two adjacent cylindrical energy storage monomers are connected in series, and the central through holes of the two adjacent cylindrical energy storage monomers are connected; When there are at least two energy storage units, the energy storage units are connected in series, in parallel or in mixed connection via connecting pieces arranged at both ends of the energy storage units; The energy storage unit forms an inner flow channel through the central through hole, and an outer flow area outside the energy storage unit is formed in the box body; the box body is also provided with a first liquid flow guide component and a second liquid flow guide component respectively located at two ends of the energy storage module for restricting the flow direction of the liquid in the inner flow channel and the outer flow area; The first liquid flow guiding component includes a first inner connecting cavity connected to the inner flow channel and a first outer connecting cavity connected to the outer flow area, and a first inner connecting pipe and a first outer connecting pipe are respectively provided in the first inner connecting cavity and the first outer connecting cavity; the second liquid flow guiding component includes a connecting cavity for connecting the inner flow channel and the outer flow area; or, the second liquid flow guiding component includes a second inner connecting cavity connected to the inner flow channel and a second outer connecting cavity connected to the outer flow area, and a second inner connecting pipe and a second outer connecting pipe are respectively provided in the second inner connecting cavity and the second outer connecting cavity.

2. The energy storage device based on cylindrical batteries according to claim 1, Features: The end surfaces of both ends of the cylindrical energy storage monomer are respectively provided with a first pole and a second pole, and the first pole and the second pole are respectively provided with a first connecting structure and a second connecting structure that can cooperate with each other; when the energy storage unit includes at least two cylindrical energy storage monomers, the first pole and the second pole of two adjacent cylindrical energy storage monomers are connected in series through the first connecting structure and the second connecting structure.

3. The energy storage device based on cylindrical batteries according to claim 2, Features: In the cylindrical energy storage cell, the first pole and the second pole are both coaxially arranged with the central through hole, and the first pole and the second pole are respectively provided with a first through hole and a second through hole connected with the central through hole.

4. The energy storage device based on cylindrical batteries according to claim 3, Features: The first connection structure includes an internal thread provided on the inner wall of the first through hole, and the second connection structure includes an external thread provided on the outer wall of the second pole and matched with the internal thread.

5. The energy storage device based on cylindrical batteries according to claim 4, Features: The connecting sheet is provided with a connecting through hole corresponding to the energy storage unit; When the connecting piece is connected to the first pole, a first connecting piece matched with the internal thread is used to connect the connecting piece and the first pole, and the first connecting piece includes an external thread section matched with the internal thread and a clamping end used to clamp and fix the connecting piece on the first pole, and a first connecting through hole connected with the first through hole is provided in the first connecting piece; When the connecting piece is connected to the second pole, the connecting piece and the second pole are connected by a second connecting piece and a third connecting piece respectively matched with the external thread, and the connecting piece is pressed and fixed between the second connecting piece and the third connecting piece.

6. The energy storage device based on cylindrical batteries according to claim 1, Features: The first liquid flow guide assembly includes a first inner plate, a first middle plate and a first outer plate which are parallel to each other, the first middle plate is located between the first inner plate and the first outer plate, and the first inner plate is located on a side of the first outer plate facing the energy storage module; A first shell is disposed outside the first inner plate, the first middle plate and the first outer plate, and the first shell forms the first inner connecting cavity and the first outer connecting cavity between the first inner plate and the first middle plate and between the first middle plate and the first outer plate, respectively.

7. The energy storage device based on cylindrical batteries according to claim 6, Features: A first mounting through hole is provided on the first inner plate corresponding to the first pole or the second pole of each energy storage unit, the first inner plate is sleeved outside the first pole or the second pole of the energy storage unit through the first mounting through hole, and the connecting piece is located on the side of the first inner plate facing the first outer plate.

8. The energy storage device based on cylindrical batteries according to claim 6, Features: A first communication channel for connecting the outer flow area with the first outer communication cavity is arranged in an array between the first inner plate and the first middle plate.

9. The energy storage device based on cylindrical batteries according to claim 1, Features: The second liquid flow guiding component includes a connecting cavity for connecting the inner flow channel and the outer flow area, and the second liquid flow guiding component includes an inner connecting plate and an outer connecting plate, and the inner connecting plate is located on the side of the outer connecting plate facing the energy storage module; a connecting shell is provided outside the inner connecting plate and the outer connecting plate, and the connecting shell forms the connecting cavity between the inner connecting plate and the outer connecting plate.

10. The energy storage device based on cylindrical batteries according to claim 9, Features: The inner connecting plate is provided with mounting through holes corresponding to the first pole or the second pole of each energy storage unit, the inner connecting plate is sleeved outside the first pole or the second pole of the energy storage unit through the mounting through holes, and the connecting piece is located on the side of the inner connecting plate facing the outer connecting plate.

11. The energy storage device based on cylindrical batteries according to claim 1, Features: The second liquid flow guide assembly comprises a second inner connecting cavity communicating with the inner flow channel and a second outer connecting cavity communicating with the outer flow area, and a second inner connecting pipe and a second outer connecting pipe are respectively disposed in the second inner connecting cavity and the second outer connecting cavity; The second liquid flow guide assembly comprises a second inner plate, a second middle plate and a second outer plate which are parallel to each other, the second middle plate is located between the second inner plate and the second outer plate, and the second inner plate is located on a side of the second outer plate facing the energy storage module; A second outer shell is disposed outside the second inner plate, the second middle plate and the second outer plate, and the second outer shell forms the second inner connecting cavity and the second outer connecting cavity between the second inner plate and the second middle plate and between the second middle plate and the second outer plate, respectively.

12. The energy storage device based on cylindrical batteries according to claim 11, Features: A second mounting through hole is provided on the second inner plate corresponding to the second pole or the second pole of each energy storage unit, the second inner plate is sleeved outside the first pole or the second pole of the energy storage unit through the second mounting through hole, and the connecting piece is located on the side of the second inner plate facing the second outer plate.

13. The energy storage device based on cylindrical batteries according to claim 11, Features: A second communication channel for connecting the outer flow area with the second outer communication cavity is arranged in an array between the second inner plate and the second middle plate.

14. The energy storage device based on cylindrical batteries according to claim 1, Features: A first inner confluence area connected to the first inner connecting pipe and a first inner diversion area connected to the inner flow channel are provided in the first inner connecting cavity, and a first inner diversion component for making the liquid flow evenly flow into or out of the first inner diversion area is provided between the first inner confluence area and the first inner diversion area.

15. The energy storage device based on cylindrical batteries according to claim 1, Features: A first external flow zone connected to the first external connecting pipe and a first external flow zone connected to the external flow zone are provided in the first external connecting cavity, and a first external flow diversion component for making the liquid flow evenly flow into or out of the first external flow diversion zone is provided between the first external flow zone and the first external flow diversion zone.

16. The energy storage device based on cylindrical batteries according to claim 1, Features: A second inner confluence area connected to the second inner connecting pipe and a second inner diversion area connected to the inner flow channel are provided in the second inner connecting cavity, and a second inner diversion component for making the liquid flow evenly flow into or out of the second inner diversion area is provided between the second inner confluence area and the second inner diversion area.

17. The energy storage device based on cylindrical batteries according to claim 1, Features: A second external flow zone connected to the second external connecting pipe and a second external flow zone connected to the external flow zone are provided in the second external connecting cavity, and a second external flow diversion component for making the liquid flow evenly flow into or out of the second external flow diversion zone is provided between the second external flow zone and the second external flow diversion zone.

18. The energy storage device based on cylindrical batteries according to claim 1, Features: The box body includes an outer shell and an upper cover covering the outer shell, and the outer shell and the upper cover are tightly matched; or, the outer shell is provided with an airtight cover whose two ends are respectively tightly connected to the first liquid flow guide component and the second liquid flow guide component and wrapped around the outside of the energy storage module.

19. The energy storage device based on cylindrical batteries according to claim 1, Features: The first liquid flow guide component is located below the energy storage module, the second liquid flow guide component is located above the energy storage module, and an exhaust hole is provided on the connecting cavity or the second outer connecting cavity.

20. The cylindrical battery-based energy storage device according to claim 1, Features: A first support frame and a second support frame are respectively installed on the first liquid flow guide assembly and the second liquid flow guide assembly, and a connecting rod for fixing the energy storage module is arranged between the first support frame and the second support frame.

21. The cylindrical battery-based energy storage device according to claim 1, Features: A guide plate is provided in the outer flow area, and a clearance hole is provided on the guide plate corresponding to the first pole or the second pole of each energy storage unit. The guide plate is sleeved outside the first pole or the second pole of the energy storage unit through the clearance hole, and the guide plate is also provided with an array of flow holes for liquid flow to pass through.

22. The energy storage device based on cylindrical batteries according to claim 21, Features: Annular protrusions are arranged on both sides of the guide plate at the edges around the clearance through hole, and the thickness of the annular protrusions gradually increases along the direction pointing to the center of the clearance through hole.

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