Battery pack and electric device

Abstract

The invention relates to the technical field of battery packs, and discloses a battery pack and a power utilization device.The battery pack has a first direction and a second direction which intersect, the battery pack comprises a box body, a plurality of single batteries, a first shunting piece and a confluence piece, the box body is provided with a containing cavity, and the box body comprises a first bottom plate and a backflow opening formed in the first bottom plate; the plurality of single batteries are arranged in the accommodating cavity; the plurality of single batteries are arranged in a first direction to form a battery pack; a plurality of battery packs are arranged at intervals along a second direction; a gap is formed between two adjacent battery packs and is communicated with the reflux inlet; the first shunting piece is arranged on the side, away from the first bottom plate, of the gap; the first flow dividing piece is in sealed connection with the adjacent battery pack, and a first flow channel is formed in the first flow dividing piece and communicates with the gap; the confluence piece is arranged on one side, far away from the single battery, of the first shunting piece; a converging flow channel is arranged in the converging piece and communicates with the first flow channel.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery pack and an electrical device using the same. Background Art

[0002] Currently, power batteries are important power devices for new energy vehicles. When the battery is in use, it has a heat generation phenomenon. If the battery is in a high temperature state for a long time, it is likely to affect its lifespan, and in severe cases, thermal runaway and other situations may occur.

[0003] The prior art has developed an immersion battery pack form, in which the battery is arranged in a battery pack box body, and the battery is cooled in an immersion manner by filling a coolant in the battery pack to ensure that the battery stably maintains its operating temperature. The existing battery pack has a liquid inlet and a liquid outlet provided on the outer wall of the box body and is communicated with a flow channel. However, some of the flow channels are close to the liquid inlet and the liquid outlet, and other parts of the flow channels are far from the liquid inlet and the liquid outlet. The fluidity of the coolant in the gaps of each region is uneven, and the purpose of efficient liquid cooling and balanced temperature control cannot be achieved. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that some of the flow channels of the existing battery pack are close to the liquid inlet and the liquid outlet, and other parts of the flow channels are far from the liquid inlet and the liquid outlet. The fluidity of the coolant in the gaps of each region is uneven, and the purpose of efficient liquid cooling and balanced temperature control cannot be achieved.

[0005] To solve the above technical problem, the present invention provides a technical solution for a battery pack:

[0006] A battery pack having intersecting first and second directions, comprising:

[0007] A box body provided with a receiving cavity; the box body includes a first bottom plate and a return port opened on the first bottom plate;

[0008] A plurality of single cells arranged in the receiving cavity; the plurality of single cells are arranged in a battery group along the first direction; a plurality of the battery groups are arranged at intervals along the second direction; there is a gap between two adjacent battery groups, and the gap is communicated with the return port;

[0009] A first flow dividing member disposed on a side of the gap away from the first bottom plate; the first flow dividing member is hermetically connected to the adjacent battery group, and a first flow channel is provided in the first flow dividing member, and the first flow channel is communicated with the gap;

[0010] A converging member disposed on a side of the first flow dividing member away from the single cell; a converging flow channel is provided in the converging member, and the converging flow channel is communicated with the first flow channel.

[0011] Furthermore, a plurality of the first flow dividers are provided at intervals along the second direction. A plurality of first holes communicating with the first flow channel are formed on one side of the first flow divider facing the gap, and the plurality of first holes communicate with the gap; a plurality of inflow ports communicating with the first flow channel are formed on the side of the first flow divider away from the gap.

[0012] A plurality of the confluence members are provided at intervals along the first direction. The confluence member is provided with a plurality of confluence outlets communicating with the confluence flow channel, and the confluence outlets communicate with the inflow ports; the plurality of confluence members and the plurality of first flow dividers are connected to form a grid-like structure.

[0013] Furthermore, the confluence member further includes a protrusion. The protrusion is located on the side of the confluence member facing the gap, and the protrusion surrounds the confluence outlet; the protrusion is inserted into the inflow port to communicate the confluence outlet and the inflow port.

[0014] Furthermore, the first flow divider is of a tubular structure, including two first walls spaced apart in the second direction, and a flange protruding in the second direction on one of the first walls.

[0015] The first flow divider further includes a first seal. The first seal is disposed between the two first walls and the side surface of the single cell facing the second direction, and between the flange and the end surface of the single cell away from the first bottom plate.

[0016] Furthermore, the battery pack further includes a second flow divider. The second flow divider is disposed on the side of the gap close to the first bottom plate. The second flow divider is hermetically connected to the adjacent battery groups along the second direction, and the first flow divider and the second flow divider are disposed opposite to each other along the third direction.

[0017] A second flow channel is provided in the second flow divider. A plurality of second holes communicating with the second flow channel are formed on the side of the second flow divider facing the gap; a plurality of flow dividing outlets are formed on the side of the second flow divider facing the first bottom plate, and the flow dividing outlets communicate with the return ports; the third direction intersects with the first direction and the second direction pairwise.

[0018] Furthermore, the battery pack further includes a limiting member. The limiting member is strip-shaped and a plurality of the limiting members are provided. The limiting member extends along the first direction or the second direction, and the limiting member is hermetically connected to the box body and the single cell.

[0019] Further, the limiting member includes a rib portion and a fitting portion. The fitting portion protrudes on the side of the rib portion facing the single battery, and the rib portion is in a blocking fit with the box body and the single battery along the third direction. A third sealing member is further provided between the fitting portion and the box body and the single battery.

[0020] Further, the box body includes a first side beam extending along the first direction. The first side beam is provided with an adapter on the side facing the accommodation cavity. One end of the current collecting member in the second direction is provided with a current collecting inlet communicating with the converging flow channel, and the current collecting inlet is communicated with the adapter.

[0021] Further, the box body further includes a second bottom plate. The second bottom plate is disposed on the side of the first bottom plate away from the single battery, and the first bottom plate and the second bottom plate are arranged at intervals along the third direction;

[0022] The box body further includes a second side beam extending along the second direction. The first bottom plate, the second bottom plate, the first side beam and the second side beam enclose a box body flow channel, and the return port is communicated with the box body flow channel.

[0023] Further, the first side beam includes a liquid inlet interface, a liquid inlet flow channel, a liquid outlet interface and a liquid outlet flow channel. The liquid inlet flow channel communicates the liquid inlet interface and the adapter, and the liquid outlet flow channel communicates the liquid outlet interface and the box body flow channel.

[0024] To solve the above technical problems, the present invention further provides a technical solution for an electrical device:

[0025] The electrical device includes a battery pack; the battery pack has a first direction, a second direction and a third direction that intersect each other in pairs, and includes:

[0026] A box body provided with an accommodation cavity; the box body includes a first bottom plate and a return port opened on the first bottom plate;

[0027] A plurality of single batteries are disposed in the accommodation cavity; the plurality of single batteries are arranged in a battery group along the first direction; a plurality of the battery groups are arranged at intervals along the second direction; there is a gap between adjacent two of the battery groups, and the gap is communicated with the return port;

[0028] A first flow dividing member is disposed on the side of the gap away from the first bottom plate; the first flow dividing member is hermetically connected to the adjacent battery group, and a first flow channel is provided in the first flow dividing member, and the first flow channel is communicated with the gap;

[0029] A current collecting member is disposed on the side of the first flow dividing member away from the single battery; a converging flow channel is provided in the current collecting member, and the converging flow channel is communicated with the first flow channel.

[0030] Further, a plurality of the first flow dividing members are provided at intervals along the second direction. A plurality of first holes communicating with the first flow channel are formed in one side of the first flow dividing member facing the gap, and the plurality of first holes communicate with the gap; a plurality of inflow ports communicating with the first flow channel are formed in the other side of the first flow dividing member away from the gap.

[0031] A plurality of the confluence members are provided at intervals along the first direction. The confluence members are provided with a plurality of confluence outlets communicating with the confluence flow channel, and the confluence outlets communicate with the inflow ports; the plurality of confluence members and the plurality of first flow dividing members are connected to form a grid-like structure.

[0032] Further, the confluence member further includes a protruding portion, which is located on the side of the confluence member facing the gap, and the protruding portion surrounds the confluence outlet; the protruding portion is inserted into the inflow port to communicate the confluence outlet and the inflow port.

[0033] Further, the first flow dividing member is of a tubular structure, including two first walls spaced apart in the second direction, and a flange protruding in the second direction on one of the first walls.

[0034] The first flow dividing member further includes a first sealing member, which is disposed between the two first walls and the side surface of the single battery in the second direction, and between the flange and the end surface of the single battery away from the first bottom plate.

[0035] Further, the battery pack further includes a second flow dividing member, which is disposed on the side of the gap close to the first bottom plate. The second flow dividing member is hermetically connected to the adjacent battery groups along the second direction, and the first flow dividing member and the second flow dividing member are oppositely disposed along the third direction.

[0036] A second flow channel is provided in the second flow dividing member. A plurality of second holes communicating with the second flow channel are formed in the second flow dividing member facing the gap; a plurality of flow dividing outlets are formed in the second flow dividing member facing the first bottom plate, and the flow dividing outlets communicate with the return ports.

[0037] Further, the battery pack further includes a limiting member, which is strip-shaped and provided with a plurality of them. The limiting member extends along the first direction or the second direction, and the limiting member hermetically connects the box body and the single battery.

[0038] Further, the limiting member includes a retaining edge portion and a fitting portion. The fitting portion protrudes from the side of the retaining edge portion facing the single battery, and the retaining edge portion is in a blocking fit with the box body and the single battery along the third direction. A third sealing member is further provided between the fitting portion and the box body and the single battery.

[0039] Further, the box body includes a first side beam extending along the first direction. The first side beam is provided with an adapter port facing the accommodating cavity. One end of the current collecting member in the second direction is provided with a current collecting inlet communicating with the converging flow channel, and the current collecting inlet is communicated with the adapter port.

[0040] Further, the box body further includes a second bottom plate. The second bottom plate is arranged on the side of the first bottom plate away from the single battery, and the first bottom plate and the second bottom plate are arranged at intervals along the third direction;

[0041] The box body further includes a second side beam extending along the second direction. The first bottom plate, the second bottom plate, the first side beam and the second side beam enclose a box body flow channel, and the return port is communicated with the box body flow channel.

[0042] Further, the first side beam includes a liquid inlet interface, a liquid inlet flow channel, a liquid outlet interface and a liquid outlet flow channel. The liquid inlet flow channel communicates the liquid inlet interface and the adapter port, and the liquid outlet flow channel communicates the liquid outlet interface and the box body flow channel.

[0043] Compared with the prior art, a battery pack and an electrical device of the present invention have the following beneficial effects: The battery pack adopts a design form of a box body, a plurality of single batteries, a first flow dividing member and a current collecting member. The box body includes a first bottom plate and a return port opened on the first bottom plate; the plurality of single batteries are arranged in a battery group along the first direction, and there is a gap between adjacent two battery groups, and the gap is communicated with the return port. It should be noted that the plurality of single batteries in the same battery group are sequentially sealed and connected along the first direction, so that a continuous and complete gap is formed between adjacent two battery groups along the first direction, thereby ensuring that the coolant flows along the third direction in the gap.

[0044] Among them, the first flow dividing member is arranged on the side of the gap away from the first bottom plate. The first flow dividing member is hermetically connected to two adjacent battery groups along the second direction. The first flow dividing member is provided with a first flow channel. A liquid cooling flow channel is formed in sequence from the first flow channel of the first flow dividing member, the gap to the return port. The coolant can play a heat exchange role on the single batteries on both sides of the gap, ensuring the battery cooling effect.

[0045] Moreover, the bus bar is arranged on the side of the first flow splitter away from the single battery. A converging flow channel is provided in the bus bar, and the converging flow channel of the bus bar is communicated with the first flow channel of the first flow splitter. The coolant first flows in the converging flow channel of the bus bar, and the coolant is distributed to the first flow channels of the respective first flow splitters through the converging flow channel, ensuring that the coolant can be evenly dispersed into each gap for flow and heat exchange.

[0046] During operation, the coolant first flows in the converging flow channel of the bus bar, enters the first flow channel of the first flow splitter through the converging flow channel and flows along the first direction, then enters the gap through the first flow channel and flows along the third direction, and finally flows out of the outside of the first bottom plate through the return port, enabling the heat-exchanged coolant to circulate. By using the layout form of the bus bar, the first flow splitter, and the return port of the first bottom plate, the coolant is first subjected to two flow rate distributions in the converging flow channel and the first flow channel, and then enters each gap to exchange heat and flow with the single battery after the flow rate distribution, ensuring that the fluidity of the coolant in the gaps in each area of the box body is more uniform, thereby achieving the purpose of efficient liquid cooling and balanced temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a perspective view of the battery pack in an embodiment of the present invention;

[0048] Figure 2 is an exploded view of the battery pack in an embodiment of the present invention;

[0049] Figure 3 is a perspective view of the box body of the battery pack in an embodiment of the present invention;

[0050] Figure 4 is a connection diagram of the first flow splitter, the second flow splitter, the bus bar, and the limiting member of the battery pack in an embodiment of the present invention;

[0051] Figure 5 is a partial cross-sectional view of the battery pack in the second direction in an embodiment of the present invention;

[0052] Figure 6 is a perspective view of the first flow splitter in an embodiment of the present invention;

[0053] Figure 7 is a perspective view of the bus bar in an embodiment of the present invention;

[0054] Figure 8 is a perspective view of the second flow splitter in an embodiment of the present invention;

[0055] Figure 9 is a perspective view of the limiting member in an embodiment of the present invention;

[0056] Figure 10 is a cross-sectional view of the battery pack in the first direction in an embodiment of the present invention;

[0057] Figure 11 It is a schematic cross-sectional view of the battery pack at the second side beam in the embodiment of the present invention;

[0058] In the figure: 1 - box body, 10 - accommodation cavity, 11 - first bottom plate, 12 - return port, 13 - first side beam, 14 - second side beam, 15 - liquid inlet interface, 150 - liquid inlet channel, 16 - liquid outlet interface, 160 - liquid outlet channel, 17 - adapter, 18 - second bottom plate, 19 - box body channel;

[0059] 2 - single battery, 20 - gap, 21 - battery pack, 22 - first side, 23 - second side, 3 - first shunt member, 30 - first channel, 31 - first hole, 32 - inlet port, 33 - first wall, 34 - flange, 35 - first seal;

[0060] 4 - second shunt member, 40 - second channel, 41 - second hole, 42 - shunt outlet, 43 - second wall, 44 - second seal, 5 - bus bar member, 50 - bus bar channel, 51 - bus bar outlet, 52 - protrusion, 53 - bus bar inlet, 6 - limiting member, 60 - retaining edge portion, 61 - fitting portion, 62 - third seal, 7 - stopping member, X - first direction, Y - second direction, Z - third direction. Detailed implementation manners

[0061] The following combines the drawings and embodiments to further describe the detailed implementation manners of the present invention in detail. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0062] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the present invention is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0063] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0064] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] As Figures 1 to 11 shown, a battery pack according to an embodiment of the present invention has a first direction X, a second direction Y, and a third direction Z that intersect pairwise, and includes: a box body 1, a plurality of single cells 2, a first shunt member 3, and a bus bar 5. The box body 1 is provided with a receiving cavity 10, and the box body 1 includes a first bottom plate 11 and a return port 12 opened on the first bottom plate 11; a plurality of single cells 2 are arranged in the receiving cavity 10, and the plurality of single cells 2 are arranged along the first direction X to form a battery pack 21; there are a plurality of battery packs 21, and the plurality of battery packs 21 are arranged at intervals along the second direction Y; there is a gap 20 between two adjacent battery packs 21, and the gap 20 communicates with the return port 12.

[0066] The first shunt member 3 is arranged on the side of the gap 20 away from the first bottom plate 11; the first shunt member 3 is hermetically connected to the battery packs 21 adjacent along the second direction Y, and a first flow channel 30 is provided in the first shunt member 3, and the first flow channel 30 communicates with the gap 20.

[0067] The bus bar 5 is arranged in the receiving cavity 10, and the bus bar 5 is located on the side of the first shunt member 3 away from the single cells 2; a converging flow channel 50 is provided in the bus bar 5; the converging flow channel 50 communicates with the first flow channel 30. It should be noted that the first direction X and the second direction Y are perpendicularly intersected in the plane of the first bottom plate 11, and the third direction Z is perpendicular to the plane of the first bottom plate 11. Moreover, the included angle between the first direction X and the second direction Y and the included angle between the third direction Z and the plane of the first bottom plate 11 both fall within the protection scope defined by "perpendicular" in this embodiment within the range of 80° to 90°.

[0068] This battery pack adopts a design form of the box body 1, a plurality of single cells 2, the first shunt member 3, and the bus bar 5. The box body 1 includes the first bottom plate 11 and the return port 12 opened on the first bottom plate 11; the plurality of single cells 2 are arranged along the first direction X to form the battery pack 21, and there is a gap 20 between two adjacent battery packs 21, and the gap 20 communicates with the return port 12. It should be noted that the plurality of single cells 2 in the same battery pack 21 are hermetically connected in sequence along the first direction X, so as to form a continuous and complete gap 20 along the first direction X between two adjacent battery packs 21, thereby ensuring that the coolant flows along the third direction Z in the gap 20.

[0069] Among them, the first flow divider 3 is arranged on the side of the gap 20 away from the first bottom plate 11, and is hermetically connected to two adjacent battery packs 21 along the second direction Y through the first flow divider. A first flow channel 30 is provided in the first flow divider 3. A liquid cooling flow channel is formed in sequence from the first flow channel 30 of the first flow divider 3, the gap 20 to the return port 12. The coolant can exchange heat with the single cells 2 on both sides of the gap 20, ensuring the battery cooling effect.

[0070] Moreover, the bus bar 5 is arranged on the side of the first flow divider 3 away from the single cell 2. A converging flow channel 50 is provided in the bus bar 5. The converging flow channel 50 of the bus bar 5 is communicated with the first flow channel 30 of the first flow divider 3. The coolant first flows in the converging flow channel 50 of the converging member 5, and the coolant is distributed to the first flow channels 30 of each first flow divider 3 through the converging flow channel 50, ensuring that the coolant can be evenly dispersed into each gap 20 for heat exchange flow.

[0071] During operation, the coolant first flows in the converging flow channel 50 of the bus bar 5, enters the first flow channel 30 of the first flow divider 3 through the converging flow channel 50 and flows along the first direction X, then enters the gap 20 through the first flow channel 30 and flows along the third direction Z, and finally flows out of the outside of the first bottom plate 11 through the return port 12, enabling the heat-exchanged coolant to circulate. By using the layout form of the bus bar 5, the first flow divider 3 and the return port 12 of the first bottom plate 11, the coolant is first subjected to two flow rate distributions in the converging flow channel 50 and the first flow channel 30. After the flow rate distribution, it enters each gap 20 to exchange heat with the single cell 2, ensuring that the fluidity of the coolant in the gaps 20 in each area of the box body 1 is more uniform, thereby achieving the purpose of efficient liquid cooling and balanced temperature control.

[0072] In this embodiment, a plurality of first flow dividers 3 are arranged at intervals along the second direction Y. A plurality of first holes 31 communicating with the first flow channel 30 are provided on the side of the first flow divider 3 facing the gap 20, and the plurality of first holes 31 communicate with the gap 20; a plurality of inflow ports 32 communicating with the first flow channel 30 are provided on the side of the first flow divider 3 away from the gap 20; a plurality of bus bars 5 are arranged at intervals along the first direction X. The bus bar 5 is provided with a plurality of converging outlets 51 communicating with the converging flow channel 50, and the converging outlets 51 communicate with the inflow ports 32; the plurality of bus bars 5 are connected to the plurality of first flow dividers 3 to form a grid-like structure. The plurality of bus bars 5 can form a plurality of input points at different positions of the first flow divider 3 in the first direction X, ensuring the flow rate uniformity of the heat exchange liquid in the entire first flow channel 30. The plurality of bus bars 5 and the plurality of first flow dividers 3 form a grid-like structure, thereby ensuring the balanced distribution of the flow rate in the gaps 20 in each area of the entire box body 1.

[0073] As a further preferred solution, the bus bar 5 further includes a protruding portion 52, such as Figure 5As shown, the protrusion 52 is located on the side of the confluence member 5 facing the gap 20, and the protrusion 52 is arranged around the confluence outlet 51; the protrusion 52 is inserted into the inflow port 32 to connect the confluence outlet 51 and the inflow port 32. By providing the protrusion 52 around the confluence outlet 51, the insertion fit between the protrusion 52 and the inflow port 32 of the first flow splitting member 3 plays a positioning role, which can improve the assembly accuracy of the confluence member 5 and the first flow splitting member 3 and ensure a reliable connection relationship between the confluence channel 50 and the first channel 30.

[0074] As Figure 6 shown, the first flow splitting member 3 is a tubular structure, including two first walls 33 spaced apart in the second direction Y, and a flange 34 protruding in the second direction Y on one of the first walls 33; the first flow splitting member 3 further includes a first seal 35, and the first seal 35 is arranged between the two first walls 33 and the side surface of the single cell 2 facing the second direction Y, and between the flange 34 and the end surface of the single cell 2 away from the first bottom plate 11. The hollow part of the first flow splitting member 3 forms the first channel 30, and the flange 34 overlaps on the upper side of the end of the single cell 2 away from the first bottom plate 11 and plays a role in positioning and installing the first flow splitting member 3 in the third direction Z. Through the contact and cooperation of the three first seals 35 with the side surface of the single cell 2 facing the second direction Y and the end surface of the single cell 2 away from the first bottom plate 11 respectively, the sealing effect on the upper part of the gap 20 is ensured.

[0075] In this embodiment, the battery pack further includes a second flow splitting member 4, and the second flow splitting member 4 is arranged on the side of the gap 20 close to the first bottom plate 11. The second flow splitting member 4 is respectively and sealingly connected to the battery groups 21 adjacent in the second direction Y, and the first flow splitting member 3 and the second flow splitting member 4 are arranged opposite to each other in the third direction Z; a second channel 40 is provided in the second flow splitting member 4, and the second flow splitting member 4 is further provided with a plurality of second holes 41 communicating with the second channel 40 facing the gap 20; the second flow splitting member 4 is provided with a plurality of flow splitting outlets 42 facing the first bottom plate 11, and the flow splitting outlets 42 are communicated with the return port 12.

[0076] During use, the heat exchange liquid flows in the gap 20 in the third direction Z, enters the second channel 40 of the second flow splitting member 4 through the second holes 41, and then flows out of the outside of the first bottom plate 11 through the flow splitting outlets 42 and the return port 12. Moreover, the second flow splitting member 4 is a tubular structure, including two second walls 43 and a second seal 44, and the two second walls 43 are spaced apart in the first direction X; the second seal 44 is respectively arranged on the two second walls 43 and is sealingly matched with the side surface of the single cell 2. The second flow splitting member 4 can define the relative positions of a plurality of battery groups 21 in the second direction Y and ensure the sealing effect on the lower part of the gap 20.

[0077] As a further preferred solution, the battery pack further includes a limiting member 6. The limiting member 6 is strip-shaped and multiple in number. The limiting member 6 extends along the first direction X or the second direction Y, and the limiting member 6 is hermetically connected to the box body 1 and the single battery 2. The relative positions of the single battery 2 and the box body 1 are reliably limited by the limiting member 6, ensuring that there is no coolant leakage between the single battery 2 and the box body 1. Specifically, the limiting member 6 includes a flange portion 60 and a fitting portion 61. The fitting portion 61 protrudes on the side of the flange portion 60 facing the single battery 2, and the flange portion 60 is in a stop fit with the box body 1 and the single battery 2 along the third direction Z. A third sealing member 62 is further provided between the fitting portion 61 and the box body 1 and the single battery 2. The limiting member 6 can form a positioning and sealing function with the box body 1 and the single battery 2, ensuring the stable and reliable position of the single battery 2 in the box body 1.

[0078] In this embodiment, the box body 1 includes a first side beam 13 extending along the first direction X. The first side beam 13 is provided with an adapter 17 facing the accommodation cavity 10. One end of the bus bar member 5 in the second direction Y is provided with a bus bar inlet 53 communicating with the confluent flow channel 50, and the bus bar inlet 53 is communicated with the adapter 17. The first side beam 13 not only provides an installation fulcrum for the bus bar member 5, but also establishes a complete liquid inlet path between the first side beam 13 and the bus bar member 5.

[0079] The box body 1 further includes a second bottom plate 18. As Figure 10 , Figure 11 shown, the second bottom plate 18 is arranged on the side of the first bottom plate 11 away from the single battery 2. The first bottom plate 11 and the second bottom plate 18 are arranged at intervals along the third direction Z. The box body 1 further includes a second side beam 14 extending along the second direction Y. The first bottom plate 11, the second bottom plate 18, the first side beam 13 and the second side beam 14 enclose a box body flow channel 19. The return port 12 is communicated with the box body flow channel 19. Moreover, two first side beams 13, two second side beams 14 and the first bottom plate 11 enclose the accommodation cavity 10. The first bottom plate 11 and the second bottom plate 18 form a hollow flow channel type bottom plate structure, which can discharge the heat exchange liquid from the bottom of the box body 1 to achieve the purpose of return circulation.

[0080] In addition, as Figure 11As shown in the figure, the first side beam 13 includes a liquid inlet interface 15, a liquid inlet flow channel 150, a liquid outlet interface 16, and a liquid outlet flow channel 160. The liquid inlet flow channel 150 is connected to the liquid inlet interface 15 and the transfer interface 17, and the liquid outlet flow channel 160 is connected to the liquid outlet interface 16 and the box body flow channel 19. When the liquid enters, the heat exchange liquid flows into the liquid inlet channel 150 from the liquid inlet interface 15, and then enters the confluence flow channel 50 through the transfer interface 17 and the confluence inlet 53. Similarly, when the liquid exits, the heat exchange liquid enters the liquid outlet flow channel 160 from the box body flow channel 19 at the bottom of the box body 1, and then is discharged outside the box body 1 through the liquid outlet interface 16. Moreover, the liquid inlet interface 15 and the liquid outlet interface 16 can be connected to a water pump and a heat dissipation structure, so as to effectively control the flow rate and the return temperature of the coolant.

[0081] An electrical device according to an embodiment of the present invention, the electrical device includes a battery pack. Among them, the battery pack is the same as each specific embodiment of the battery pack in the specific implementation manner of the battery pack of the above invention, and will not be described in detail here.

[0082] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack having a first direction (X) and a second direction (Y) intersecting each other, characterized in that: include: A box body (1) is provided with a containing cavity (10); the box body (1) comprises a first bottom plate (11) and a return port (12) opened on the first bottom plate (11); A plurality of single cells (2) are arranged in the accommodating cavity (10); the plurality of single cells (2) are arranged along a first direction (X) to form a battery group (21); a plurality of the battery groups (21) are arranged at intervals along the second direction (Y); a gap (20) is provided between two adjacent battery groups (21), and the gap (20) is connected to the reflux port (12); A first flow divider (3) is arranged on a side of the gap (20) away from the first bottom plate (11); the first flow divider (3) is sealed and connected to the adjacent battery pack (21); a first flow channel (30) is arranged in the first flow divider (3), and the first flow channel (30) is connected to the gap (20); The confluence member (5) is arranged on a side of the first flow dividing member (3) away from the single battery (2); a confluence channel (50) is arranged in the confluence member (5), and the confluence channel (50) is connected to the first flow channel (30).

2. The battery pack according to claim 1, characterized in that: A plurality of the first flow divider (3) are arranged at intervals along the second direction (Y); a plurality of first holes (31) communicating with the first flow channel (30) are provided on a side of the first flow divider (3) facing the gap (20), and the plurality of first holes (31) are communicated with the gap (20); a plurality of inlet ports (32) communicating with the first flow channel (30) are provided on a side of the first flow divider (3) away from the gap (20); A plurality of the confluence components (5) are arranged at intervals along the first direction (X); the confluence components (5) are provided with a plurality of confluence outlets (51) connected to the confluence flow channel (50), and the confluence outlets (51) are connected to the inlet (32); and a plurality of the confluence components (5) are connected to a plurality of the first flow diverters (3) to form a grid-like structure.

3. The battery pack according to claim 2, characterized in that: The confluence piece (5) further comprises a protrusion (52), the protrusion (52) being located on a side of the confluence piece (5) facing the gap (20), and the protrusion (52) being arranged around the confluence outlet (51); the protrusion (52) being inserted into the inlet (32) to connect the confluence outlet (51) and the inlet (32).

4. The battery pack according to claim 1, characterized in that: The first flow divider (3) is a tubular structure, comprising two first walls (33) spaced apart in the second direction (Y), and a flange (34) protruding toward the second direction (Y) and arranged on one of the first walls (33); The first flow divider (3) further comprises a first sealing member (35), wherein the first sealing member (35) is arranged between the two first walls (33) and the side surfaces of the single battery (2) facing the second direction (Y), and between the flange (34) and the end surface of the single battery (2) away from the first bottom plate (11).

5. The battery pack according to claim 1, characterized in that: The battery pack further comprises a second flow divider (4), the second flow divider (4) being arranged on a side of the gap (20) close to the first bottom plate (11), the second flow divider (4) being respectively sealed and connected to the battery packs (21) adjacent along the second direction (Y), and the first flow divider (3) and the second flow divider (4) being arranged opposite to each other along a third direction (Z); The second flow divider (4) is provided with a second flow channel (40), and the second flow divider (4) is provided with a plurality of second holes (41) connected to the second flow channel (40) toward the gap (20); the second flow divider (4) is provided with a plurality of flow diversion outlets (42) toward the first bottom plate (11), and the flow diversion outlets (42) are connected to the return port (12); the third direction (Z) intersects with the first direction (X) and the second direction (Y) in pairs.

6. The battery pack according to claim 1, characterized in that: The battery pack further comprises a limiting member (6), the limiting member (6) being in the shape of an elongated strip and being provided in plurality, the limiting member (6) extending along the first direction (X) or the second direction (Y), and the limiting member (6) sealingly connecting the box body (1) and the single battery (2).

7. The battery pack according to claim 6, characterized in that: The limiting member (6) comprises a retaining edge portion (60) and a fitting portion (61); the fitting portion (61) is protrudingly arranged on a side of the retaining edge portion (61) facing the single cell (2); the retaining edge portion (60) is engaged with the box body (1) and the single cell (2) in a blocking manner along the third direction (Z); and a third sealing member (62) is further arranged between the fitting portion (61) and the box body (1) and the single cell (2).

8. The battery pack according to claim 1, characterized in that: The box body (1) comprises a first side beam (13) extending along the first direction (X), the first side beam (13) being provided with a transfer interface (17) facing the accommodating cavity (10), the confluence member (5) being provided with a confluence inlet (53) connected to the confluence flow channel (50) at one end in the second direction (Y), and the confluence inlet (53) being connected to the transfer interface (17).

9. The battery pack according to claim 8, characterized in that: The box body (1) further comprises a second bottom plate (18), the second bottom plate (18) being arranged on a side of the first bottom plate (11) away from the single battery (2), the first bottom plate (11) and the second bottom plate (18) being arranged at intervals along the third direction (Z); The box body (1) further comprises a second side beam (14) extending along the second direction (Y); the first bottom plate (11), the second bottom plate (18), the first side beam (13) and the second side beam (14) form a box body flow channel (19); and the return port (12) is connected to the box body flow channel (19).

10. The battery pack according to claim 9, characterized in that: The first side beam (13) comprises a liquid inlet interface (15), a liquid inlet flow channel (150), a liquid outlet interface (16) and a liquid outlet flow channel (160); the liquid inlet flow channel (150) is connected to the liquid inlet interface (15) and the transfer interface (17); and the liquid outlet flow channel (160) is connected to the liquid outlet interface (16) and the box flow channel (19).

11. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 10.

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