Open type immersion overflow battery pack

Abstract

The invention discloses an open type immersion overflow battery pack which comprises a pack shell and a battery assembly installed in the pack shell, and the battery assembly comprises a plurality of battery monomers arranged at intervals; the wrapping shell is of an open structure with an opening in the top surface, a lower gap is formed between the battery assembly and the bottom surface of the wrapping shell and forms a lower liquid inlet area, and an upper overflow area is formed between the opening in the top surface of the wrapping shell and the top surface of the battery assembly; a middle channel for communicating the lower liquid inlet area with the upper overflow area is arranged between the battery monomers, and a side channel for communicating the lower liquid inlet area with the upper overflow area is arranged between the periphery of the battery assembly and the package shell; the lower liquid inlet area is provided with a flow distribution flow direction control assembly used for conducting liquid inlet flow distribution on the middle channel and the side channels. And a liquid inlet corresponding to the lower liquid inlet area is formed in the ladle shell. According to the open type immersion overflow battery pack, temperature control is achieved in an immersion mode, and the open type immersion overflow battery pack has the advantages of being high in heat exchange efficiency and good in temperature consistency.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric energy storage, and specifically relates to an open flooded battery pack. Background Art

[0002] At present, with the continuous improvement of my country's energy consumption structure, the energy storage battery industry has shown explosive development, and the safety and stability of energy storage systems have attracted more and more attention. In the process of charging and discharging, energy storage batteries will generate a lot of heat due to the existence of ohmic heat and polarization heat. If this heat cannot be diffused in time, on the one hand, it will accumulate inside the battery and increase the speed of the side reactions at the interface of the energy storage battery. On the other hand, excessive heat accumulation may cause thermal runaway of the battery. Therefore, efficient heat dissipation measures must be considered in the design of energy storage batteries.

[0003] At present, there are two main heat dissipation methods for energy storage systems: air cooling and liquid cooling. Among them, air cooling mainly uses air conditioning for refrigeration, and the cooling medium is air. It has low energy efficiency, large equipment footprint, and poor temperature consistency of energy storage batteries. Liquid cooling uses a cooling plate with water as the cooling medium. The heat is exchanged between the cooling medium flowing in the cooling plate and the energy storage battery. The heat needs to pass through the battery shell and the cooling plate and finally transfer to the cooling medium. The cooling medium then dissipates the heat through the radiator. There are many heat transfer links, large thermal resistance, low heat exchange efficiency, and high requirements for radiator performance. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an open flooded battery pack, which achieves temperature control by immersion and has the advantages of high heat exchange efficiency and good temperature consistency.

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

[0006] An open flooded battery pack comprises a pack housing and a battery assembly mounted in the pack housing, wherein the battery assembly comprises a plurality of battery cells arranged at intervals;

[0007] The outer shell is an open structure with an opening on the top surface, a lower gap is provided between the battery assembly and the bottom surface of the outer shell to form a lower liquid inlet area, and an upper overflow area is formed between the top surface opening of the outer shell and the top surface of the battery assembly;

[0008] A middle channel for connecting the lower liquid inlet area and the upper overflow area is provided between the battery cells, and a side channel for connecting the lower liquid inlet area and the upper overflow area is provided between the periphery of the battery assembly and the outer shell;

[0009] The lower liquid inlet area is provided with a flow diversion direction control component for diverting the liquid inlet to the middle channel and the side channel; and a liquid inlet is provided on the outer shell corresponding to the lower liquid inlet area.

[0010] Furthermore, the overflow height of the upper overflow area is higher than the top surface height of the battery assembly.

[0011] Furthermore, a top cover plate is installed at the top opening of the package shell, and the top cover plate is set to a hollow structure to form a top overflow hole for overflow of the temperature control medium.

[0012] Furthermore, an explosion-proof valve is provided on the top surface of the battery cell, and the top overflow hole is staggered with the explosion-proof valve.

[0013] Furthermore, the battery assembly includes two end pressure plates respectively located on both sides, the battery cell is located between the two end pressure plates, and the middle channel is formed between the end pressure plates and the adjacent battery cells; the middle channel is provided with partition strips for providing a set spacing between the battery cells and between the end pressure plates and the adjacent battery cells.

[0014] Furthermore, the package shell includes a bottom flow channel plate and a side plate assembly surrounding the battery assembly; the lower liquid inlet area is located between the battery assembly and the bottom flow channel plate, and the side channel is located between the side plate assembly and the battery assembly.

[0015] Furthermore, the bottom flow channel plate and the side panel assembly are integrally formed; or, the bottom flow channel plate and the side panel assembly are separately arranged, and the side panel assembly includes a panel located at the front end, a back panel located at the rear end and side panels located on both sides; the bottom flow channel plate is fixedly connected to the back panel and the two side panels, the two ends of the back panel are respectively fixedly connected to the rear ends of the two side panels, and the panel is fixedly connected to the battery assembly; connecting plates are respectively provided on both sides of the panel, and the connecting plates are fixedly connected to the corresponding side panels.

[0016] Furthermore, a positioning clip is provided at the rear end of the bottom flow channel plate.

[0017] Furthermore, a snap-on connection structure is used to achieve fixed connection between the bottom flow channel plate and the back plate, between the bottom flow channel plate and the side plate, between the back plate and the side plate, and between the connecting plate and the side plate.

[0018] Furthermore, the snap-on connection structure includes several groups of clips spaced apart between two adjacent plates, each group includes two clips, the two clips belonging to the same group are respectively arranged on two adjacent plates, and the two clips belonging to the same group are connected and fixed by a clip block.

[0019] Furthermore, the clip includes a card column and a limit head, the outer diameter of the limit head is larger than the outer diameter of the card column, the card column is fixedly connected to the corresponding plate or is integrally formed, a limit slot is formed between the limit head and the corresponding plate, an embedded slot is provided on the card block corresponding to the card column, and the thickness of the card block is equal to or slightly larger than or slightly smaller than the width of the limit slot.

[0020] Furthermore, the battery assembly includes two end pressure plates located on both sides respectively, and a connecting seat located in front of the battery assembly is installed on the end pressure plates, and the panel is fixedly connected to the connecting seat.

[0021] Furthermore, the panel is provided with a handle; the number of the handles is two and they are respectively located on two sides of the panel; the handle is fixedly mounted on the panel, or the handle is detachably mounted on the panel.

[0022] Furthermore, a circuit board is installed between the panel and the battery assembly.

[0023] Furthermore, bottom diversion channels are respectively provided on both sides of the bottom flow channel plate, and middle diversion holes for allowing the temperature control medium to enter the middle channel are respectively provided on the side walls facing each other of the two bottom diversion channels, and side diversion holes connected to the side channels are respectively provided on the side walls opposite to each other of the two bottom diversion channels.

[0024] Furthermore, support ribs for supporting the battery assembly are provided at intervals on the bottom flow channel plate and are located between the two bottom shunt channels; a middle shunt channel is formed between two adjacent support ribs, and the middle shunt holes connected to each of the middle shunt channels are respectively provided on the side walls facing each other.

[0025] Furthermore, a rear shunt hole communicating with the side channel is provided on a side wall of one of the middle shunt channels located at the rear end of the bottom flow channel plate.

[0026] Furthermore, a liquid inlet diverter cover and a liquid inlet diverter channel connected to the liquid inlet diverter cover are provided at the front end of the bottom flow channel plate, the two bottom diverter channels are both connected to the liquid inlet diverter channel, and the liquid inlet is connected to the liquid inlet diverter cover.

[0027] Furthermore, a front diversion hole communicating with the side channel is provided on the top surface of the liquid inlet diversion cover.

[0028] Furthermore, an overflow control frame is provided on the top of the battery assembly, and the overflow control frame divides the upper overflow area into a middle overflow area connected to the middle channel, and a side overflow area connected to the side channel is formed between the overflow control frame and the outer shell.

[0029] Furthermore, the overflow control frame includes a front baffle and a rear baffle respectively located at the front and rear sides of the battery assembly, and side baffles are respectively provided between the two ends of the front baffle and the rear baffle.

[0030] Furthermore, a consolidation assembly is provided between the two end pressure plates, and the consolidation assembly includes a binding belt that is bound between the two end pressure plates and bypasses the top surface and the bottom surface of the battery assembly.

[0031] Furthermore, the consolidation assembly also includes connecting belts located on the front side and the rear side of the battery assembly, and the two ends of the connecting belts are respectively fixedly connected to the two end pressure plates.

[0032] Furthermore, at least two connecting strips are respectively provided on the front side and the rear side of the battery assembly, and connecting strips are respectively provided on the front side and the rear side of the battery assembly, and the connecting strips are connected to all connecting strips located on the front side or the rear side of the battery assembly.

[0033] Furthermore, load-bearing members are respectively provided on the front and rear sides of the top surface of the battery assembly.

[0034] Furthermore, an overflow control frame is provided on the top of the battery assembly, and the overflow control frame includes a front baffle and a rear baffle respectively located on the front and rear sides of the battery assembly, and side baffles are respectively provided between the two ends of the front baffle and the rear baffle; the front baffle is integrated with the load-bearing member located on the front side of the top surface of the battery assembly, and the rear baffle is integrated with the load-bearing member located on the rear side of the top surface of the battery assembly.

[0035] Furthermore, the outer shell includes a bottom flow channel plate and a side plate assembly surrounding the battery assembly; load-bearing screws penetrating through the end pressure plates are respectively provided between the two ends of the load-bearing member and the bottom flow channel plate.

[0036] Furthermore, a connecting piece threadedly connected to the load-bearing screw rod is provided at the top of the connecting piece, the connecting piece extends upward and out of the outer shell, and a screw hole for installing a load-bearing lifting ring is provided on the top surface of the connecting piece.

[0037] Furthermore, the package shell includes a bottom flow channel plate and a side plate assembly surrounding the battery assembly; a top cover plate is installed at the top opening of the package shell, and cover plate through holes are provided on the top cover plate corresponding to the connecting parts one by one, and the connecting parts extend to the top of the top cover plate through the corresponding cover plate through holes, and a clamping nut is provided on the connecting parts for clamping and fixing the top cover plate on the side plate assembly.

[0038] Furthermore, the side panel assembly is provided with a first sealing strip located below the top cover plate, and the edges around the top cover plate are provided with a second sealing strip.

[0039] Furthermore, a series-parallel connector is provided between two adjacent battery cells; the series-parallel connector includes a connector body, the connector body includes two parallel connecting bars arranged opposite to each other, a bendable and deformable connecting bridge is provided between the two parallel connecting bars, and the parallel connecting bars are provided with a pole lug connecting piece for connecting to the pole lugs of the battery cells.

[0040] Furthermore, the battery cell is provided with at least four pole tabs, and the number of the pole tab connecting pieces provided on each of the parallel connection bars is equal to half the number of the pole tabs of the battery cell.

[0041] The beneficial effects of the present invention are:

[0042] The open type flooded battery pack of the present invention is provided with a gap between the battery assembly and the bottom surface of the pack shell to form a lower liquid inlet area, and an opening is provided on the top surface of the pack shell to form an upper overflow area, and a middle channel and a side channel connected in parallel are provided between the lower liquid inlet area and the upper overflow area, the middle channel is formed between the battery cells, and the side channel is formed between the battery assembly and the side wall of the pack shell; thus, a temperature control medium is introduced into the lower liquid inlet area through the liquid inlet, and the temperature control medium is respectively It flows to the upper overflow area through the middle channel and the side channels; when the liquid level of the temperature control medium in the outer shell exceeds the overflow height of the upper overflow area, the temperature control medium overflows outward through the top opening of the outer shell, so that the temperature control medium can immerse the battery assembly, and the uniform temperature control and temperature control are achieved by the flowing temperature control medium. Through the diversion effect of the diversion flow control component, the flow rate and flow velocity of the temperature control medium in each middle channel and side channel can be balanced, thereby improving the heat exchange efficiency and having the advantage of good temperature consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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:

[0044] Figure 1 A front view of an embodiment of an open flooded battery pack of the present invention;

[0045] Figure 2 for Figure 1 AA section view;

[0046] Figure 3 for Figure 2 A magnified view of area B;

[0047] Figure 4 for Figure 2 A magnified view of region C;

[0048] Figure 5 It is a structural schematic diagram of the card block;

[0049] Figure 6 for Figure 2 DD cross-sectional view;

[0050] Figure 7 for Figure 6 A magnified view of the E region;

[0051] Figure 8 for Figure 2 FF cross-sectional view;

[0052] Fig. 9 for Figure 8 A magnified view of the G region;

[0053] Fig.10 This is a front isometric view of the open flooded battery pack of this embodiment;

[0054] Fig.11 It is a rear axonometric view of the open flooded battery pack of this embodiment;

[0055] Fig.12 for Fig.11 Schematic diagram of the structure after the top cover is hidden;

[0056] Fig.13 is an axonometric view of a battery assembly;

[0057] Fig.14 is a schematic diagram of the structure of the bottom flow channel plate;

[0058] Fig.15 It is a structural diagram of the series-parallel connection components.

[0059] Description of reference numerals:

[0060] 30-battery assembly; 31-battery monomer; 32-lower liquid inlet area; 33-upper overflow area; 33a-middle overflow area; 33b-side overflow area; 34-middle channel; 35-end pressure plate; 36a-average temperature liquid inlet pipe; 36b-temperature control liquid inlet pipe; 37-separator; 38-side channel; 39-liquid inlet; 40-top cover; 41-top overflow hole; 42-bottom flow channel plate; 43-panel; 44-back plate; 45-side plate; 46-connecting plate; 47-clip; 47a-clip column; 47b-limiting head; 47c-limiting card slot; 48-card block; 48a-embedded card slot; 49-positioning clip; 50-connecting seat; 51-circuit board; 52-handle; 53-bottom shunt channel; 53a-top Connecting hole; 53b-make way gap; 54-middle diversion hole; 55-side diversion hole; 56-support rib; 57-middle diversion channel; 58-rear diversion hole; 59-liquid inlet diversion cover; 60-liquid inlet diversion channel; 61-front diversion hole; 62-overflow control frame; 62a-front baffle; 62b-rear baffle; 62c-side baffle; 63-binding belt; 64-connecting belt; 65-connecting strip; 66-load-bearing member; 67-load-bearing screw; 68-connecting member; 69-lower connecting member; 70-tightening nut; 71-first sealing strip; 72-second sealing strip; 73-series-parallel connecting member; 74-parallel strip; 75-connecting bridge; 76-ear connecting piece; 77-third sealing strip; 78-slot 79-fourth sealing strip. DETAILED DESCRIPTION

[0061] 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.

[0062] like Figure 1-15As shown, the open immersion overflow battery pack of this embodiment includes a pack shell and a battery assembly 30 installed in the pack shell. In this embodiment, the pack shell is an open structure with an opening on the top surface. There is a lower gap between the battery assembly 30 and the bottom surface of the pack shell and forms a lower liquid inlet area 32. An upper overflow area 33 is formed between the top surface opening of the pack shell and the top surface of the battery assembly 30. In this embodiment, the overflow height of the upper overflow area 33 is higher than the top surface height of the battery assembly 30, so that the battery assembly 30 can be completely immersed in the temperature control medium. In the preferred implementation of this embodiment, a top cover plate 40 is installed at the top surface opening of the pack shell. The top cover plate 40 is set as a hollow structure to form a top overflow hole 41 for overflow of the temperature control medium. By setting the top cover plate 40, the battery assembly 30 can be protected. Specifically, an explosion-proof valve is provided on the top surface of the battery cell 31, and the top overflow hole 41 is staggered with the explosion-proof valve. In this way, when the battery cell 31 experiences thermal runaway and the explosion-proof valve opens, the top overflow hole 41 is staggered with the explosion-proof valve, and the top cover plate 40 can block the substances ejected from the explosion-proof valve.

[0063] like Figure 2 ,6,8, in this embodiment, the battery assembly 30 includes a plurality of battery cells 31 arranged at intervals, and a middle channel 34 for connecting the lower liquid inlet area 32 and the upper overflow area 33 is provided between the battery cells 31. In order to facilitate the assembly and fixation of the battery assembly 30, the battery assembly 30 of this embodiment also includes two end pressure plates 35 located on both sides, respectively, and the battery cell 31 is located between the two end pressure plates 35, and a middle channel 34 is formed between the end pressure plates 35 and the adjacent battery cells 31. In the preferred implementation of this embodiment, a separator bar 37 is provided at intervals in the middle channel 34 for providing a set spacing between the battery cells 31 and between the end pressure plate 35 and the adjacent battery cells 31. The separator bar 37 can, on the one hand, provide the middle channel 34 with a set width, and on the other hand, is also used to withstand the pressure between the battery cells 31 and between the battery cells 31 and the end pressure plate 35 after the battery assembly 30 is assembled.

[0064] In this embodiment, a side channel 38 for connecting the lower liquid inlet area 32 and the upper overflow area 33 is provided between the periphery of the battery assembly 30 and the outer shell. Figure 7 The lower liquid inlet area 32 of this embodiment is provided with a flow direction control component for diverting the liquid inlet to the middle channel 34 and the side channel 38. Of course, a liquid inlet 39 is provided on the outer shell of this embodiment corresponding to the lower liquid inlet area 32. The liquid inlet 39 is used to connect the liquid inlet pipe to inject the temperature control medium into the lower liquid inlet area 32. Specifically, the liquid inlet of this embodiment is connected to the temperature equalizing liquid inlet pipe 36a and the temperature control liquid inlet pipe 36b, as shown in FIG. Figure 1-3 shown.

[0065] In this embodiment, the housing includes a bottom flow channel plate 42 and a side panel assembly surrounding the battery assembly 30. The lower liquid inlet area 32 is located between the battery assembly 30 and the bottom flow channel plate 42, and the side channel 38 is located between the side panel assembly and the battery assembly 30. Specifically, in this embodiment, the bottom flow channel plate 42 and the side panel assembly are separately arranged. The side panel assembly includes a panel 43 located at the front end, a back panel 44 located at the rear end, and side panels 45 located on both sides. The bottom flow channel plate 42 is fixedly connected to the back panel 44 and the two side panels 45, the two ends of the back panel 44 are respectively fixedly connected to the rear ends of the two side panels 45, the panel 43 is fixedly connected to the battery assembly 30, and the two sides of the panel 43 of this embodiment are respectively provided with connecting plates 46, and the connecting plates 46 are fixedly connected to the corresponding side panels 45. Of course, in some other embodiments, the bottom flow channel plate 42 can also be integrally formed with the side panel assembly 30, which will not be repeated. In this embodiment, the outer shell is provided with reinforcing ribs for enhancing the structural strength, and the reinforcing ribs can be formed in various existing ways, such as reinforcing strips protruding outward or reinforcing grooves recessed inward, etc., which will not be described in detail. Specifically, in this embodiment, reinforcing ribs are respectively provided on the back plate 44 and the side plate 45.

[0066] In this embodiment, the bottom channel plate 42 and the back plate 44, the bottom channel plate 42 and the side plate 45, the back plate 44 and the side plate 45, and the connecting plate 46 and the side plate 45 are all fixedly connected by a snap-on connection structure. Figure 4-5 As shown, the snap-on connection structure of this embodiment includes several groups of clips 47 arranged at intervals between two adjacent plates, each group includes two clips 47, and the two clips 47 belonging to the same group are respectively arranged on the two adjacent plates, and the two clips 47 belonging to the same group are connected and fixed by a clamping block 48. In the preferred implementation of this embodiment, the clip 47 includes a clamping column 47a and a limiting head 47b, the outer diameter of the limiting head 47b is larger than the outer diameter of the clamping column 47a, the clamping column 47a is fixedly connected or integrally formed with the corresponding plate, a limiting clamping groove 47c is formed between the limiting head 47b and the corresponding plate, and an embedded clamping groove 48a is provided on the clamping block 48 corresponding to the clamping column 47a, and the thickness of the clamping block 48a is equal to or slightly larger than or slightly smaller than the width of the limiting clamping groove 47c. In this way, by respectively arranging the clips 47 at the connecting edges of the two adjacent plates, the connection and fixation between the two adjacent plates can be realized by using the clamping block 48 to be embedded in the clip 47, and the connection operation is more convenient and quick compared with the traditional threaded connection, riveting and other processes.

[0067] In the preferred implementation of this embodiment, a positioning clip 49 is provided at the rear end of the bottom flow channel plate 42 for installation and positioning of the battery pack of this embodiment. Figure 4 shown.

[0068] like Fig.12As shown, in this embodiment, a connection seat 50 located in front of the battery assembly 30 is installed on the end pressure plate 35, and the panel 43 is fixedly connected to the connection seat 50, that is, the panel 43 is fixedly connected to the battery assembly 30 through the connection seat 50. In this embodiment, a circuit board 51 is installed between the panel 43 and the battery assembly 30, that is, the circuit board 51 is also immersed in the temperature control medium, which can achieve the technical purpose of temperature control of the circuit board 51.

[0069] In this embodiment, a handle 52 is provided on the panel 43. In this embodiment, two handles 52 are provided and are respectively located on both sides of the panel 43. In some embodiments, the handle 52 is fixedly mounted on the panel 43; in other embodiments, the handle 52 can also be detachably mounted on the panel 43. In this embodiment, the handle 52 is connected to the connecting seat 50, so that the force applied to the handle 52 can be transmitted to the connecting seat 50 without being borne by the panel 43, thereby avoiding deformation of the panel 43 due to the force. By providing the handle 52, it is easy to move the battery pack, so as to facilitate the installation, inspection and maintenance of the battery pack.

[0070] In the flow direction control assembly of the present embodiment, bottom flow channel plates 42 are provided with bottom flow channel 53 on both sides, and middle flow holes 54 for allowing the temperature control medium to enter the middle channel 34 are provided on the opposite side walls of the two bottom flow channel 53, and side flow holes 55 connected to the side channels 38 are provided on the opposite side walls of the two bottom flow channel 53. Fig.14 As shown. In the preferred implementation of this embodiment, support ribs 56 for supporting the battery assembly 30 are provided on the bottom flow channel plate 42 at intervals and are located between the two bottom shunt channels 53; a middle shunt channel 57 is formed between the two adjacent support ribs 56, and middle shunt holes 54 connected to each middle shunt channel 57 are provided on the opposite side walls of the two bottom shunt channels 53. On the one hand, the support ribs 56 can support the battery assembly 30, and on the other hand, they can form the middle shunt channel 57, so that the flow of the temperature control medium at different positions in the middle channel 34 can be more uniform. In this embodiment, a rear shunt hole 58 connected to the side channel 38 is provided on the side wall of a middle shunt channel 57 located at the rear end of the bottom flow channel plate 42, so as to achieve the technical purpose of injecting the temperature control medium into the side channel 38 between the back plate 44 and the battery assembly 30. When the width of the bottom shunt channel 53 is large and covers part of the middle channels 34 located on both sides of the battery assembly, a top connecting hole 53a can be set on the top surface of the bottom shunt channel 53 corresponding to the covered middle channels 34 so that the temperature control medium can enter these middle channels 34.

[0071] In the flow direction control assembly of the present embodiment, in order to make the temperature control medium injected into the liquid inlet 39 be evenly diverted to the two bottom diverter channels 53, the front end of the bottom flow channel plate 42 of the present embodiment is provided with a liquid inlet diverter cover 59 and a liquid inlet diverter channel 60 connected to the liquid inlet diverter cover 59. The two bottom diverter channels 53 are both connected to the liquid inlet diverter channel 60, and the liquid inlet 39 is connected to the liquid inlet diverter cover 59. Figure 3-4 , as shown in 13. In this embodiment, the liquid inlet diverter cover 59 is located at the center of the two bottom diverter channels 53, so that the temperature control medium in the liquid inlet diverter cover 59 can flow evenly into the two bottom diverter channels 53. In the preferred implementation of this embodiment, a front diverter hole 61 connected to the side channel 38 is provided on the top surface of the liquid inlet diverter cover 59. The front diverter hole 61 is used to inject the temperature control medium into the side channel 38 between the panel 43 and the battery assembly 30. Since a circuit board 51 is provided between the panel 43 and the battery assembly 30, the circuit board 51 generates a large amount of heat. By providing an independent front diverter hole 61 to increase the flow rate and flow of the temperature control medium in the side channel 38 between the panel 43 and the battery assembly 30, a better temperature control effect is achieved on the circuit board 51.

[0072] In this embodiment, an overflow control frame 62 is provided on the top of the battery assembly 30. The overflow control frame 62 divides the upper overflow area 33 into a middle overflow area 33a connected to the middle channel 34, and forms a side overflow area 33b connected to the side channel 38 between the overflow control frame 62 and the outer shell. By providing the overflow control frame 62 to divide the upper overflow area 33 into the middle overflow area 33a and the side overflow area 33b, the immersion depth of the battery assembly 30 can be ensured, and the temperature control medium immersed in the battery assembly 30 can be prevented from being affected by the temperature control medium in the side channel 38. In this embodiment, the overflow control frame 62 includes a front baffle 62a and a rear baffle 62b respectively located at the front and rear sides of the battery assembly, and side baffles 62c are respectively provided between the two ends of the front baffle 62a and the rear baffle 62b.

[0073] like Fig.13As shown, a consolidation assembly is provided between the two end pressure plates 35 of this embodiment. The consolidation assembly of this embodiment includes a binding belt 63 that is tied between the two end pressure plates 35 and bypasses the top and bottom surfaces of the battery assembly 30. The head and tail ends of the binding belt 63 are fixedly connected and used to tighten the battery assembly 30. In a preferred implementation of this embodiment, the consolidation assembly also includes a connecting belt 64 located on the front side and rear side of the battery assembly 30. The two ends of the connecting belt 64 are respectively fixedly connected between the two end pressure plates 35, which can further strengthen the clamping force between the two end pressure plates 35. Specifically, at least two connecting belts 64 are respectively provided on the front side and rear side of the battery assembly 30, and connecting strips 65 are respectively provided on the front side and rear side of the battery assembly 30. The connecting strips 65 are connected to all the connecting strips 64 located on the front side or rear side of the battery assembly. In this embodiment, two connecting strips 64 are respectively provided on the front side and the rear side of the battery assembly 30. The two connecting strips 64 located on the front side or the rear side of the battery assembly 30 are respectively located at the upper and lower ends of the front side or the rear side of the battery assembly 30. The upper and lower ends of the connecting strip 65 are respectively fixedly connected to the two connecting strips 64 located on the front side or the rear side of the battery assembly 30. The bottom shunt channel 53 of this embodiment is provided with a clearance notch 53b for making way for the binding strip 63, so that the bottom surface of the battery cell 31 can fall on the bottom shunt channel 53. Fig.14 shown.

[0074] like Figure 8-9As shown, in this embodiment, the front and rear sides of the top surface of the battery assembly 30 are respectively provided with load-bearing members 66, and the load-bearing members 66 mainly play a load-bearing role. In the preferred implementation of this embodiment, the front baffle 62a is integrated with the load-bearing member 66 located on the front side of the top surface of the battery assembly, and the rear baffle 62b is integrated with the load-bearing member 66 located on the rear side of the top surface of the battery assembly, which can reduce the number of parts and facilitate assembly. In this embodiment, load-bearing screws 67 passing through the end pressure plate 35 are respectively provided between the two ends of the load-bearing member 66 and the bottom flow channel plate 42. In this embodiment, a connecting member 68 threadedly connected to the load-bearing screw 67 is provided at the top of the load-bearing screw 67, and the connecting member 68 extends upward and extends out of the shell, and a screw hole for installing a load-bearing lifting ring is provided on the top surface of the connecting member 68. The bottom of the load-bearing screw 67 is provided with a lower connecting member 69 threadedly connected to the load-bearing screw 67. In this embodiment, the top cover plate 40 is provided with cover plate through holes corresponding to the connecting member 68, and the connecting member 68 extends to the top of the top cover plate 40 through the corresponding cover plate through holes, and the connecting member 68 is provided with a clamping nut 70 for pressing and fixing the top cover plate 40 on the side plate assembly. In the preferred implementation of this embodiment, the side plate assembly is provided with a first sealing strip 71 located below the top cover plate 40, and the edges of the top cover plate 40 are provided with a second sealing strip 72. The first sealing strip 71 mainly plays the role of sealing the top cover plate 40 and the side plate assembly to prevent the temperature control medium from flowing out from the connection seam between the top cover plate 40 and the side plate assembly. The second sealing strip 72 is mainly sealed with the external structure, so that the overflow direction of the temperature control medium can be guided to further improve the uniform temperature and temperature control effect. In this embodiment, a third sealing strip 77 is provided between the bottom flow channel plate 42 and the panel 43. The bottom flow channel plate 42 is provided with a slot 78 for installing the back plate 44 and the side plate 45, and a fourth sealing strip 79 is installed in the slot 78.

[0075] In this embodiment, a serial-parallel connection member 73 is provided between two adjacent battery cells 31. Fig.15 As shown, the series-parallel connector 73 includes a connector body, which includes two parallel connecting bars 74 arranged opposite to each other, a bendable and deformable connecting bridge 75 is provided between the two parallel connecting bars 74, and a tab connecting piece 76 for connecting to the tabs of the battery cell 31 is provided on the parallel connecting bar 74. In this embodiment, at least four tabs are provided on the battery cell 31, half of which are positive tabs and the other half are negative tabs. In this embodiment, the number of tab connecting pieces 76 provided on each parallel connecting bar 74 is equal to half of the number of tabs of the battery cell 31, that is, the tab connecting pieces 76 on the same parallel connecting bar 74 are respectively connected to all positive tabs or negative tabs of the same battery cell 31, so as to realize parallel connection between multiple positive tabs or negative tabs in the same battery cell 31.

[0076] 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 open flooded battery pack, characterized in that: It includes a package shell and a battery assembly installed in the package shell, wherein the battery assembly includes a plurality of battery cells arranged at intervals; The outer shell is an open structure with an opening on the top surface, a lower gap is provided between the battery assembly and the bottom surface of the outer shell to form a lower liquid inlet area, and an upper overflow area is formed between the top surface opening of the outer shell and the top surface of the battery assembly; A middle channel for connecting the lower liquid inlet area and the upper overflow area is provided between the battery cells, and a side channel for connecting the lower liquid inlet area and the upper overflow area is provided between the periphery of the battery assembly and the outer shell; The lower liquid inlet area is provided with a flow diversion direction control component for diverting the liquid inlet to the middle channel and the side channel; and a liquid inlet is provided on the outer shell corresponding to the lower liquid inlet area.

2. The open flooded battery pack according to claim 1, characterized in that: The overflow height of the upper overflow area is higher than the top surface height of the battery assembly.

3. The open flooded battery pack according to claim 1, characterized in that: A top cover plate is installed at the top opening of the package shell, and the top cover plate is set as a hollow structure to form a top overflow hole for overflow of the temperature control medium.

4. The open flooded battery pack according to claim 1, characterized in that: An explosion-proof valve is arranged on the top surface of the battery cell, and the top overflow hole is staggered with the explosion-proof valve.

5. The open flooded battery pack according to claim 1, characterized in that: The battery assembly includes two end pressure plates respectively located on both sides, the battery cell is located between the two end pressure plates, and the middle channel is formed between the end pressure plates and the adjacent battery cells; the middle channel is provided with separation strips for setting a set distance between the battery cells and between the end pressure plates and the adjacent battery cells.

6. The open flooded battery pack according to claim 1, characterized in that: The package shell includes a bottom flow channel plate and a side plate assembly surrounding the battery assembly; the lower liquid inlet area is located between the battery assembly and the bottom flow channel plate, and the side channel is located between the side plate assembly and the battery assembly.

7. The open flooded battery pack according to claim 6, characterized in that: The bottom flow channel plate and the side panel assembly are integrally formed; or, the bottom flow channel plate and the side panel assembly are separately arranged, and the side panel assembly includes a panel located at the front end, a back panel located at the rear end and side panels located on both sides; the bottom flow channel plate is fixedly connected to the back panel and the two side panels, the two ends of the back panel are respectively fixedly connected to the rear ends of the two side panels, and the panel is fixedly connected to the battery assembly; connecting plates are respectively provided on both sides of the panel, and the connecting plates are fixedly connected to the corresponding side panels.

8. The open flooded battery pack according to claim 7, characterized in that: A positioning clip is provided at the rear end of the bottom flow channel plate.

9. The open flooded battery pack according to claim 7, characterized in that: A snap-on connection structure is used to achieve fixed connection between the bottom flow channel plate and the back plate, between the bottom flow channel plate and the side plate, between the back plate and the side plate, and between the connecting plate and the side plate.

10. The open flooded battery pack according to claim 9, characterized in that: The snap-on connection structure includes a plurality of groups of clips spaced apart between two adjacent plates, each group includes two clips, the two clips belonging to the same group are respectively disposed on two adjacent plates, and the two clips belonging to the same group are connected and fixed by a clip block.

11. The open flooded battery pack according to claim 10, characterized in that: The clip includes a card column and a limit head, the outer diameter of the limit head is larger than the outer diameter of the card column, the card column is fixedly connected to the corresponding plate or formed as one piece, a limit slot is formed between the limit head and the corresponding plate, an embedded slot is provided on the card block corresponding to the card column, and the thickness of the card block is equal to or slightly larger than or slightly smaller than the width of the limit slot.

12. The open flooded battery pack according to claim 7, characterized in that: The battery assembly comprises two end pressure plates respectively located at two sides, a connection seat located in front of the battery assembly is mounted on the end pressure plates, and the panel is fixedly connected to the connection seat.

13. The open flooded battery pack according to claim 12, characterized in that: The panel is provided with a handle; the handle is provided with two and is respectively located at two sides of the panel; the handle is fixedly mounted on the panel, or the handle is detachably mounted on the panel.

14. The open flooded battery pack according to claim 7, characterized in that: A circuit board is installed between the panel and the battery assembly.

15. The open flooded battery pack according to claim 6, characterized in that: Bottom flow channel plates are provided on both sides respectively, and middle flow holes for allowing temperature control medium to enter the middle channel are provided on the opposite side walls of the two bottom flow channels respectively, and side flow holes connected to the side channels are provided on the opposite side walls of the two bottom flow channels.

16. The open flooded battery pack according to claim 15, characterized in that: Support ribs for supporting the battery assembly are arranged at intervals on the bottom flow channel plate and are located between the two bottom shunt channels. A middle shunt channel is formed between two adjacent support ribs, and the middle shunt holes connected to each of the middle shunt channels are respectively arranged on the side walls facing each other.

17. The open flooded battery pack according to claim 16, characterized in that: A rear shunt hole communicating with the side channel is provided on the side wall of one of the middle shunt channels located at the rear end of the bottom flow channel plate.

18. The open flooded battery pack according to claim 15, characterized in that: A liquid inlet diverter cover and a liquid inlet diverter channel connected to the liquid inlet diverter cover are provided at the front end of the bottom flow channel plate, the two bottom diverter channels are both connected to the liquid inlet diverter channel, and the liquid inlet is connected to the liquid inlet diverter cover.

19. The open flooded battery pack according to claim 18, characterized in that: A front diversion hole communicating with the side channel is arranged on the top surface of the liquid inlet diversion cover.

20. The open flooded battery pack according to claim 2, characterized in that: An overflow control frame is provided on the top of the battery assembly, and the overflow control frame divides the upper overflow area into a middle overflow area connected to the middle channel, and a side overflow area connected to the side channel is formed between the overflow control frame and the outer shell.

21. The open flooded battery pack according to claim 20, characterized in that: The overflow control frame includes a front baffle and a rear baffle respectively located at the front and rear sides of the battery assembly, and side baffles are respectively arranged between the two ends of the front baffle and the rear baffle.

22. The open flooded battery pack according to claim 5, characterized in that: A consolidation assembly is provided between the two end pressure plates, and the consolidation assembly includes a binding belt which is bound between the two end pressure plates and passes around the top surface and the bottom surface of the battery assembly.

23. The open flooded battery pack according to claim 22, characterized in that: The consolidation assembly also includes connection belts located on the front side and the rear side of the battery assembly, and the two ends of the connection belt are respectively fixedly connected to the two end pressure plates.

24. The open flooded battery pack according to claim 23, characterized in that: At least two connection strips are respectively arranged on the front side and the rear side of the battery assembly, and connection strips are respectively arranged on the front side and the rear side of the battery assembly, and the connection strips are connected to all the connection strips located on the front side or the rear side of the battery assembly.

25. The open flooded battery pack according to claim 4, characterized in that: The front and rear sides of the top surface of the battery assembly are respectively provided with load-bearing parts.

26. The open flooded battery pack according to claim 25, characterized in that: An overflow control frame is provided on the top of the battery assembly, and the overflow control frame includes a front baffle and a rear baffle respectively located on the front and rear sides of the battery assembly, and side baffles are respectively provided between the two ends of the front baffle and the rear baffle; the front baffle is integrated with the load-bearing member located on the front side of the top surface of the battery assembly, and the rear baffle is integrated with the load-bearing member located on the rear side of the top surface of the battery assembly.

27. The open flooded battery pack of claim 25, wherein: The outer shell includes a bottom flow channel plate and a side plate assembly surrounding the battery assembly; load-bearing screws penetrating the end pressure plates are respectively provided between the two ends of the load-bearing member and the bottom flow channel plate.

28. The open flooded battery pack of claim 27, wherein: A connecting piece threadedly connected to the load-bearing screw rod is disposed on the top of the load-bearing screw rod. The connecting piece extends upward and out of the outer shell. A screw hole for installing a load-bearing lifting ring is disposed on the top surface of the connecting piece.

29. The open flooded battery pack of claim 28, wherein: The package shell includes a bottom flow channel plate and a side plate assembly surrounding the battery assembly; a top cover plate is installed at the top opening of the package shell, and cover plate through holes are provided on the top cover plate corresponding to the connecting members, and the connecting members extend to the top of the top cover plate through the corresponding cover plate through holes, and a clamping nut is provided on the connecting member for clamping and fixing the top cover plate on the side plate assembly.

30. The open flooded battery pack of claim 29, wherein: The side panel assembly is provided with a first sealing strip located below the top cover panel, and the edges around the top cover panel are provided with a second sealing strip.

31. The open flooded battery pack of claim 1, wherein: A series-parallel connector is provided between two adjacent battery cells; the series-parallel connector includes a connector body, the connector body includes two parallel connecting bars arranged opposite to each other, a bendable and deformable connecting bridge is provided between the two parallel connecting bars, and the parallel connecting bars are provided with tab connecting pieces for connecting to the tabs of the battery cells.

32. The open flooded battery pack of claim 31, wherein: The battery cell is provided with at least four pole tabs, and the number of the pole tab connecting sheets provided on each of the parallel connection bars is equal to half the number of the pole tabs of the battery cell.

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