Battery pack and electric device

Abstract

The invention discloses a battery pack and an electricity utilization device, and relates to the technical field of batteries. The battery pack comprises a box body, a plurality of single batteries and a middle beam, the box body is provided with a containing cavity, the middle beam is arranged in the containing cavity and connected with the box body so that the containing cavity can be divided into a first space and a second space which are distributed in the third direction, and the multiple single batteries are arranged in the first space and connected with the middle beam. The middle beam is provided with a main liquid inlet flow channel and a main liquid outlet flow channel which extend in the first direction and are arranged in the second direction. The main liquid inlet flow channel and the main liquid outlet flow channel are formed in the internal space of the middle beam and are both communicated with the thermal management system to form a water path structure, so that the occupied space of the battery pack in the height and length directions is saved, the number of pipelines and the number of connecting point positions are also reduced, and the production efficiency is improved. Therefore, the box body can accommodate more single batteries in a limited space, the space utilization rate and the reliability of the battery pack are effectively improved, and the weight of the battery pack is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] In order to meet the growing demands for high-power discharge and fast charging, the energy density of batteries continues to increase, and the heat generated by batteries during use is also increasing. Therefore, a thermal management system needs to be set up in the battery to cool the battery.

[0003] The following problems exist when the current battery thermal management system is connected to the water pipeline:

[0004] Increased number of pipes: Since branch pipes need to be deployed from the water inlet and outlet main pipes connected to the water inlet and outlet, and then connected to the cooling structure, the number of pipes will increase. This will occupy more internal space of the battery pack, resulting in an increase in the overall size of the battery pack.

[0005] More connection points: As more water points need to be connected, such as water inlets and outlets, branch pipes and cooling structure connection points, the number of connections in the entire battery pack will also increase. This will increase the risk of connection failure, resulting in water leakage or unreliable connection problems. Summary of the invention

[0006] The object of the present invention is to provide a battery pack and power equipment to solve the technical problems of complex water channel layout and low space utilization of the battery pack due to a large number of pipelines and connection points.

[0007] On the one hand, the present application provides a battery pack, which includes a first direction, a second direction and a third direction that intersect each other, and the battery pack includes: a box body, the box body having a accommodating cavity; a plurality of single cells; and a middle beam, the middle beam is arranged in the accommodating cavity and connected to the box body to divide the accommodating cavity into a first space and a second space distributed along the third direction, the plurality of single cells are arranged in the first space and connected to the middle beam, the middle beam is provided with a total liquid inlet channel and a total liquid outlet channel both extending along the first direction, the total liquid inlet channel and the total liquid outlet channel are arranged along the second direction, and the second space is formed as a buffer space or an installation space.

[0008] On the other hand, the present application also provides an electrical device, including the above-mentioned battery pack, and the battery pack is used to provide electrical energy to the electrical device.

[0009] The technical effect of the present invention is that the battery pack of the present application utilizes the internal space of the middle beam to form a total liquid inlet channel and a total liquid outlet channel arranged along the second direction. The total liquid inlet channel and the total liquid outlet channel are both connected to the thermal management system to form a water channel structure, thereby saving the space occupied by the battery pack in the first direction (height direction) and the third direction (length direction), and also reducing the number of pipelines and the number of connection points, so that the battery pack box can accommodate more single cells in a limited space, effectively improving the space utilization and reliability of the battery pack, and reducing the weight of the battery pack. By adopting the above-mentioned battery pack, the electric device of the present application can improve the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0011] Figure 1 A schematic diagram of the overall structure of the battery pack provided in an embodiment of the present application.

[0012] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the battery pack provided.

[0013] Figure 3 for Figure 1 A schematic diagram of a partially exploded structure of the provided battery pack.

[0014] Figure 4 A schematic diagram of the connection structure between the middle beam and the first side beam provided in an embodiment of the present application.

[0015] Figure 5 for Figure 4 A partial enlarged image of part F is provided.

[0016] Figure 6 for Figure 4 A partial exploded view of part F is provided.

[0017] Figure 7 A schematic diagram of the structure of a thermal management system provided in an embodiment of the present application.

[0018] Figure 8 This is a schematic diagram of the first angle structure of the middle beam provided in an embodiment of the present application.

[0019] Fig. 9 This is a schematic diagram of the second angle structure of the middle beam provided in an embodiment of the present application.

[0020] Fig.10 for Fig. 9 Cross-section along DD.

[0021] Fig.11 for Figure 2 A partial enlarged view of area A in the middle.

[0022] Fig.12 A cross-sectional view of the current collector provided in an embodiment of the present application in the second direction.

[0023] Fig.13 Schematic diagram of the structure of the middle beam provided in the embodiment of the present application Figure 3 .

[0024] Fig.14 A cross-sectional view of the transfer tube provided in an embodiment of the present application in the second direction.

[0025] Fig.15 A partial enlargement of the end of the middle beam provided in the embodiment of the present application Figure 1 ,Right now Fig.13 A partial enlarged view of area E in the middle.

[0026] Fig.16 A partial enlargement of the end of the middle beam provided in the embodiment of the present application Figure 2 .

[0027] Fig.17 Schematic diagram of the structure of the middle beam provided in the embodiment of the present application Figure 4 .

[0028] Fig.18 for Fig.17 A partial enlarged view of area B in the middle.

[0029] Fig.19 for Fig.17 A partial enlarged view of area C in the middle.

[0030] The components of the attached drawings are identified as follows:

[0031] Y is the first direction; Z is the second direction; X is the third direction;

[0032] 1 box body; 11 bottom plate; 12 first side beam; 13 second side beam; 10 accommodating cavity;

[0033] 101 first space; 1011 first subspace; 1012 second subspace; 102 second space;

[0034] 2 single cells; 21 poles;

[0035] 3 middle beam; 31 total liquid inlet flow channel; 32 total liquid outlet flow channel;

[0036] 301 branch liquid inlet; 302 branch liquid outlet; 304 main liquid inlet; 305 main liquid outlet;

[0037] 30 transfer groups;

[0038] 33 liquid inlet adapter; 34 liquid outlet adapter; 35 liquid inlet nozzle assembly; 36 liquid outlet nozzle assembly; 37 blocking member; 39 cavity;

[0039] 311 fixing hole; 321 fixing piece;

[0040] 331 first locking hole; 332 second locking hole; 333 first fastener; 334 second fastener; 300 accommodation space; 310 first accommodation space; 320 second accommodation space;

[0041] 4 support beams;

[0042] 5 thermal management system; 50 heat exchange unit; 51 first heat exchange tube; 52 second heat exchange tube;

[0043] 6 current collector; 61 liquid inlet section; 62 liquid outlet section; 63 first separator; 64 first connecting pipe; 65 second connecting pipe;

[0044] 7 transfer tube; 71 second partition plate;

[0045] 81 first thermal insulation layer; 82 second thermal insulation layer;

[0046] 9 functional components;

[0047] 20 connecting piece; 201 first connecting hole; 202 second connecting hole. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "up", "down", "left", and "right", generally refer to the up, down, left, and right of the device in actual use or working state, specifically the drawing direction in the accompanying drawings.

[0049] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0050] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", "stacked" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0053] To solve the technical problems that the water circuit structure of the battery pack is complex due to the large number of pipelines and connection points, the water circuit layout of the battery pack is complex due to the large number of pipelines and connection points, and the space utilization rate is low. The embodiment of the present application provides a battery pack, the battery includes a first direction, a second direction and a third direction intersecting each other, and the battery pack includes a box, a plurality of single cells, an intermediate beam and a thermal management system. Multiple single cells are arranged in the box. The intermediate beam is arranged in the box and is arranged on one side of the single cell in the first direction. The intermediate beam is provided with a total liquid inlet flow channel and a total liquid outlet flow channel extending in the first direction, and the total liquid inlet flow channel and the total liquid outlet flow channel are arranged in the second direction. The thermal management system is arranged on one side of the single cell in the second direction, and the thermal management system includes a plurality of heat exchange units arranged in the first direction, each heat exchange unit includes a first heat exchange tube and a second heat exchange tube extending in the third direction, the first heat exchange tube and the second heat exchange tube are arranged at intervals in the second direction and are connected to each other, the first heat exchange tube is connected to the total liquid inlet flow channel, and the second heat exchange tube is connected to the total liquid outlet flow channel. The above solution uses the internal space of the middle beam to form a total liquid inlet flow channel and a total liquid outlet flow channel, and the total liquid inlet flow channel and the total liquid outlet flow channel are connected to the thermal management system to form a water channel structure, so as to save the space occupied by the battery pack in the first direction, and also reduce the number of pipes and connection points, so that the battery pack box can accommodate more single cells in a limited space, effectively improving the space utilization and reliability of the battery pack. A detailed description will be given below.

[0054] In one embodiment, if Figure 1 As shown, the battery includes a first direction Y, a second direction Z and a third direction X that intersect each other. It can be understood that the first direction Y can be the width direction of the battery pack, the second direction Z can be the height direction of the battery pack, and the third direction X can be the length direction of the battery pack.

[0055] like Figure 1 to Figure 2 As shown, the battery pack includes a box body 1, a plurality of single batteries 2, a middle beam 3 and a thermal management system 5.

[0056] The box body 1 includes a bottom plate 11, two first side beams 12 and two second side beams 13. Specifically, the bottom plate 11 is a plate-shaped member, and the bottom plate 11 can be a bottom guard plate with a multi-layer structure. The bottom plate 11 is connected to the first side beams 12 on both sides of the third direction X, and the bottom plate 11 is connected to the second side beams 13 on both sides of the first direction Y. The bottom plate 11, the first side beams 12 and the second side beams 13 cooperate to enclose a receiving cavity 10.

[0057] A plurality of single cells 2 are disposed in the box 1. The plurality of single cells 2 arranged along the third direction X constitute a battery pack, and the plurality of battery packs are arranged along the first direction Y.

[0058] The middle beam 3 is arranged in the accommodating cavity 10 and connected to the box body 1 to divide the accommodating cavity 10 into a first space 101 and a second space 102 distributed along the third direction X. A plurality of single cells 2 are arranged in the first space 101 and connected to the middle beam 3. The middle beam 3 is provided with a total liquid inlet channel 31 and a total liquid outlet channel 32 both extending along the first direction Y. The total liquid inlet channel 31 and the total liquid outlet channel 32 are arranged along the second direction Z. The second space 102 is formed as a buffer space or an installation space, wherein when the second space 102 is an installation space, functional components such as a battery management system, a battery disconnecting module, etc. can be installed therein, which will be further described below.

[0059] Specifically, the middle beam 3 extends along the first direction Y, and both ends of the middle beam 3 are respectively connected to the first side beams 12 , so that the accommodating cavity 10 is divided into a first space 101 and a second space 102 distributed along the third direction X.

[0060] The embodiment of the present application utilizes the inner space of the middle beam 3 to form the total liquid inlet flow channel 31 and the total liquid outlet flow channel 32. In this way, while the middle beam 3 bears the expansion force of the single battery 2, it can also fully utilize the inner space of the middle beam 3 to form the total liquid inlet flow channel 31 and the total liquid outlet flow channel 32, and no additional internal space of the battery pack is occupied, so that the battery pack box 1 can accommodate more single batteries 2 in a limited space, thereby improving the space utilization of the battery pack.

[0061] like Figures 1 to 4 As shown, in some embodiments, the first space 101 can be used to accommodate the single battery 2, and the second space 102 can be used to accommodate the functional component 9. In this way, the space of the battery pack box 1 can be fully utilized, and more single batteries 2 can be accommodated in a limited space to improve the space utilization of the battery pack. In addition, since the second space 102 accommodates the functional component 9, when the middle beam 3 can bear the expansion force of the single battery 2, the functional component 9 can bear a part of the expansion beam to avoid a large deformation of the middle beam 3, thereby ensuring the reliability of the middle beam 3.

[0062] In another embodiment, the first space 101 can be used to accommodate the single battery 2, and the second space 102 forms a buffer space. It can be understood that when the second space 102 forms a buffer space, the distance between the middle beam 3 and the second side beam 13 in the third direction X is shorter, or the middle beam 3 and the second side beam 13 abut against each other in the third direction X. In this way, the middle beam 3 can bear the expansion force of the single battery 2 and can also transfer the expansion force to the second side beam 13, avoiding a large deformation of the middle beam 3, thereby ensuring the reliability of the middle beam 3.

[0063] The functional component 9 may be an electrical component, and the electrical component includes a battery management system (BMS), a BDU, etc. In some specific embodiments, the functional component 9 includes a slave control board of the BMS; in other specific embodiments, the functional component 9 includes a bus bar.

[0064] like Figures 4 to 6 As shown, in one embodiment, the middle beam 3 is connected to the first side beam 12 by welding or bolting. When the middle beam 3 is connected to the first side beam 12 by bolting, the middle beam 3 is provided with a cavity 39 and a first locking hole 331, and the cavity 39 and the first locking hole 331 are both disconnected from the total liquid inlet channel 31 and the total liquid outlet channel 32. The cavity 39 extends along the first direction Y, and the first locking hole 331 extends along the third direction X and communicates with the cavity 39. The first side beam 12 is provided with a second locking hole 332.

[0065] The battery pack also includes a connector 20, a plurality of first fasteners 333, and a plurality of second fasteners 334. The connector 20 connects the middle beam 3 and the first side beam 12. The connector 20 is provided with a first connection hole 201 and a second connection hole 202. The first connection hole 201 is arranged opposite to the first locking hole 331, and the second connection hole 202 is arranged opposite to the second locking hole 332. The plurality of first fasteners 333 are respectively inserted into the first connection hole 201 and the first locking hole 331, and connect the middle beam 3 and the connector 20. The plurality of second fasteners 334 are respectively inserted into the second connection hole 202 and the second locking hole 332, and connect the connector 20 and the first side beam 12. The connector 20, the first fasteners 333, and the second fasteners 334 cooperate with each other, so that the middle beam 3 and the first side beam 12 are fixed together, thereby improving the structural strength of the box body 1.

[0066] like Figure 1 and Figure 2 As shown, the battery pack further includes a support beam 4, which is arranged opposite to the middle beam 3 in the third direction X and connected between the two first side beams 12 in the first direction Y. Figure 2 As can be seen from the figure, the middle beam 3 is located on the left side of the box body 1, and the support beam 4 is located on the right side of the box body 1. The support beam 4 is located in the first space 101, and the first space 101 is divided into a first subspace 1011 and a second subspace 1012. The first subspace 1011 is used to accommodate the single battery 2, and the second subspace 1012 is used to accommodate the battery management system. When the second subspace 1012 is used to accommodate the battery management system, the second space 102 can be used to accommodate the battery cut-off unit or the second space 102 can form a buffer space.

[0067] The support beam 4 is an extruded hollow structure, which can effectively ensure the structural stability of the support beam 4 and reduce the risk of bending of the support beam 4, thereby ensuring the reliability of the support beam 4.

[0068] The middle beam 3 and the support beam 4 are arranged in the box body 1. The middle beam 3, the support beam 4, the two first side beams 12 and the bottom plate 11 cooperate with each other to enclose a space for accommodating the single battery 2. The middle beam 3 and the support beam 4 can both be used as expansion beams, so that the two side surfaces of the single battery 2 in the third direction X can be fixed. When the single battery 2 expands due to heat, the middle beam 3 and the support beam 4 can absorb the expansion force of the single battery 2, thereby improving the service life of the battery pack.

[0069] A fluid flows in the thermal management system 5, and the thermal management system 5 is arranged on one side of the single cell 2 along the second direction Z, and includes at least the following embodiments: First, the thermal management system 5 can be arranged on the side of the single cell 2 away from the bottom plate 11, that is, the thermal management system 5 shown in the figure is arranged above the single cell 2, and the fluid is used to perform heat exchange treatment on the single cell 2. Second, the thermal management system 5 can be arranged between the bottom plate 11 and the single cell 2, and the fluid is used to perform heat exchange treatment on multiple single cells 2.

[0070] like Figure 7 As shown, the thermal management system 5 includes a plurality of heat exchange units 50 arranged along a first direction Y, and the heat exchange unit 50 includes a first heat exchange tube 51 and a second heat exchange tube 52 both extending along a third direction X. The first heat exchange tube 51 and the second heat exchange tube 52 are spaced apart and connected to each other along the first direction Y, the first heat exchange tube 51 is connected to the total liquid inlet channel 31, and the second heat exchange tube 52 is connected to the total liquid outlet channel 32.

[0071] In one embodiment, the first heat exchange tubes 51 and the second heat exchange tubes 52 are alternately arranged in sequence along the first direction Y. In another embodiment, the first heat exchange tubes 51 of two adjacent heat exchange units 50 are arranged close to each other, and can share a liquid inlet while realizing the circulation of the fluid. In another embodiment, the second heat exchange tubes 52 of two adjacent heat exchange units 50 are arranged close to each other, and can share a liquid outlet while realizing the circulation of the fluid.

[0072] like Figures 7 and 8 As shown, the middle beam 3 is provided with a plurality of branch liquid inlets 301 and a plurality of branch liquid outlets 302 on the surface of one side away from the single cell 2. The total liquid inlet channel 31 is fluidically connected with the first heat exchange tube 51 through the branch liquid inlet 301, and the total liquid outlet channel 32 is fluidically connected with the second heat exchange tube 52 through the branch liquid outlet 302, thereby realizing fluid circulation.

[0073] like Figure 2As shown, the battery pack includes a plurality of adapters 33 / 34, and the plurality of adapters 33 / 34 are arranged at intervals along the first direction Y on a side of the middle beam 3 away from the single battery 2. The adapter 33 / 34 connects the total liquid inlet channel 31 with the first heat exchange tube 51, and / or the adapter 33 / 34 connects the total liquid outlet channel 32 with the second heat exchange tube 52.

[0074] Specifically, the adapter 33 / 34 includes a plurality of liquid inlet adapters 33, and the plurality of liquid inlet adapters 33 are arranged at intervals along the first direction Y on the side of the middle beam 3 away from the single cell 2. It can be understood that the liquid inlet adapter 33 is arranged on the side of the middle beam 3 away from the single cell 2. The fluid connection between the total liquid inlet channel 31 and the first heat exchange tube 51 is realized through the liquid inlet adapter 33, and then the fluid flows from the first heat exchange tube 51 to the second heat exchange tube 52 and flows out from the second heat exchange tube 52 to the total liquid outlet channel 32, thereby realizing the circulation of the fluid. Alternatively, the fluid flows from the first heat exchange tube 51 to the second heat exchange tube 52 and flows out from the pipeline connected to the second heat exchange tube 52.

[0075] like Figure 2 As shown, in some embodiments, the adapter 33 / 34 includes a plurality of liquid inlet adapters 33 and a plurality of liquid outlet adapters 34, and the liquid inlet adapters 33 and the liquid outlet adapters 34 are both arranged on the side of the middle beam 3 away from the single battery 2. It can be understood that, as Figure 2 As shown, the liquid inlet adapter 33 and the liquid outlet adapter 34 are both arranged on the left side wall of the middle beam 3. With such arrangement, on the one hand, the right side wall of the middle beam 3 can be a flat surface, and fit with the side of the single battery 2 without any gap. When the single battery 2 expands due to heat, the middle beam 3 can directly bear the expansion force of the single battery 2 and directly squeeze the single battery 2, which is beneficial to prolong the service life of the battery pack. On the other hand, the second space 102 can be fully utilized to install components, further improving the volume utilization rate of the battery pack.

[0076] like Figures 8 to 10 As shown, the liquid inlet adapter 33 is connected to the total liquid inlet channel 31, and the liquid outlet adapter 34 is connected to the total liquid outlet channel 32. Specifically, one end of the liquid inlet adapter 33 is installed at the branch liquid inlet 301 and is connected to the total liquid inlet channel 31, and the other end of the liquid inlet adapter 33 is connected to the first heat exchange tube 51. Similarly, one end of the liquid outlet adapter 34 is installed at the branch liquid outlet 302 and is connected to the total liquid outlet channel 32, and the other end of the liquid outlet adapter 34 is connected to the second heat exchange tube 52. Among them, the flow direction of the fluid is roughly as follows: the fluid located in the total liquid inlet channel 31 flows to the liquid inlet adapter 33, the first heat exchange tube 51, the second heat exchange tube 52, the liquid outlet adapter 34 and the total liquid outlet channel 32 in sequence, so as to realize the circulation of the fluid, thereby performing heat exchange treatment on the single cell 2 to achieve the cooling effect and improve the safety of the battery pack.

[0077] like Figure 2 As shown, the thermal management system 5 further includes a current collector 6 located on the left side of the housing 1. The current collector 6 extends along the first direction Y and is connected to the first heat exchange tube 51 and the second heat exchange tube 52 in the third direction X. The current collector 6 is connected to the ends (left ends) of the first heat exchange tube 51 and the second heat exchange tube 52.

[0078] like Figure 11 to Figure 12 As shown, the current collector 6 includes a connected liquid inlet section 61 and a liquid outlet section 62 , and adjacent liquid inlet sections 61 and liquid outlet sections 62 are separated by a first partition plate 63 to avoid cross-flow problems.

[0079] The battery pack further includes a plurality of first connecting tubes 64 and a plurality of second connecting tubes 65, wherein the plurality of first connecting tubes 64 extend along the second direction Z and communicate with the current collector 6, and the first connecting tubes 64 are disposed on a side close to the single battery 2. The plurality of second connecting tubes 65 extend along the second direction Z and communicate with the current collector 6, and the second connecting tubes 65 are disposed on a side close to the single battery 2.

[0080] Specifically, Fig.10 As shown, the lower surface of the current collector 6 is provided with a plurality of first connecting tubes 64 and a plurality of second connecting tubes 65, wherein the first connecting tubes 64 are liquid inlet connecting tubes and the second connecting tubes 65 are liquid outlet connecting tubes. The first connecting tubes 64 and the second connecting tubes 65 are located at the same end, and when the fluid circulation is satisfied, the single battery 2 can be heat exchanged and cooled more evenly to avoid excessive temperature difference.

[0081] The first connecting tube 64 , the second connecting tube 65 and the current collector 6 are an integrally formed structure, which facilitates assembly and improves the assembly efficiency of the battery pack.

[0082] The first connecting tube 64 is connected to the liquid inlet adapter 33, and the second connecting tube 65 is connected to the liquid outlet adapter 34. Specifically, the first connecting tube 64 can be connected to the liquid inlet adapter 33 by a threaded connection. Similarly, the second connecting tube 65 can be connected to the liquid outlet adapter 34 by a threaded connection. Among them, a sealing film can be provided at the connection between the first connecting tube 64 and the liquid inlet adapter 33 and at the connection between the second connecting tube 65 and the liquid outlet adapter 34, so as to enhance the sealing effect of the connection.

[0083] The first connecting pipe 64 can be vertically connected to the liquid inlet adapter 33 in the first direction Y, and the second connecting pipe 65 can be vertically connected to the liquid outlet adapter 34 in the first direction Y, so that the pipeline can be connected with the shortest path, and space can be saved and space utilization can be improved.

[0084] like Figure 7As shown, in one embodiment, in order to improve the installation effect of the thermal management system 5 , the current collector 6 can be connected to at least two heat exchange units 50 . Figure 7 The schematic diagram of the structure of each current collector 6 connecting two heat exchange units 50 is shown. The current collector 6 has a liquid inlet section 61 and two liquid outlet sections 62. The liquid inlet section 61 is located between the two liquid outlet sections 62, so that the two heat exchange units 50 share one liquid inlet section 61. Figure 7 In the embodiment, the arrangement of the heat exchange tubes in the two heat exchange units 50 in the first direction Y is: the second heat exchange tube 52, the first heat exchange tube 51, the first heat exchange tube 51 and the second heat exchange tube 52. According to the arrangement of the two heat exchange tubes, two adjacent heat exchange units 50 share a liquid inlet adapter 33, that is, two adjacent first heat exchange tubes 51 are connected to the liquid inlet adapter 33 at the same time, which can reduce the number of connections and connection points of the pipeline. Figure 3 In the figure, every two units correspond to one adapter group 30, and multiple adapter groups 30 are arranged on the left side wall of the middle beam 3, and the adapters in each adapter group 30 are arranged as follows: liquid outlet adapter 34, liquid inlet adapter 33, and liquid outlet adapter 34.

[0085] In another embodiment, the current collector 6 may have two liquid inlet sections 61 and one liquid outlet section 62, and the liquid outlet section 62 is located between the two liquid inlet sections 61, so that the two heat exchange units 50 share one liquid outlet section 62. The arrangement of the heat exchange tubes in the two heat exchange units 50 in the first direction Y is: the first heat exchange tube 51, the second heat exchange tube 52, the second heat exchange tube 52 and the first heat exchange tube 51. According to the arrangement of the above two heat exchange tubes, two adjacent heat exchange units 50 share one liquid outlet adapter 34, that is, two adjacent second heat exchange tubes 52 are connected to the liquid outlet adapter 34 at the same time, so that the number of connections and connection points of the pipeline can be reduced. In addition, two units correspond to one adapter group 30, and multiple adapter groups 30 are arranged on the left side wall of the middle beam 3, and the arrangement of the adapters in each adapter group 30 is: liquid inlet adapter 33, liquid outlet adapter 34, and liquid inlet adapter 33.

[0086] like Figure 4 As shown, the battery pack further includes a water nozzle assembly 35 / 36, which is disposed on a side of the middle beam 3 away from the single battery 2 and communicates with the total liquid inlet channel 31 and / or the total liquid outlet channel 32. The water nozzle assembly 35 / 36 may include a liquid inlet nozzle assembly 35 and a liquid outlet nozzle assembly 36.

[0087] like Figure 4As shown, in one embodiment, two adjacent adapters 33 / 34 are spaced apart to form a receiving space 300. The faucet assembly 35 / 36 and the functional component 9 (such as a BMS slave control) can be located in the receiving space 300 at the same time or at least one of them. It is even possible that at least part of the faucet assembly 35 / 36 is located in the receiving space 300, or at least part of the functional component 9 is located in the receiving space 300.

[0088] In some embodiments, adjacent liquid inlet adapters 33 and liquid outlet adapters 34 are spaced apart to form a first accommodation space 310, and two adjacent liquid inlet adapters 33 are spaced apart to form a second accommodation space 320. In another embodiment, adjacent liquid inlet adapters 33 and liquid outlet adapters 34 are spaced apart to form a first accommodation space 310, and two adjacent liquid outlet adapters 34 are spaced apart to form a second accommodation space 320.

[0089] In some embodiments, the liquid inlet nozzle assembly 35 or the liquid outlet nozzle assembly 36 is located in the first accommodating space 310, and the functional component 9 is located in the second accommodating space 320. In this way, the space of the battery pack case 1 can be fully utilized, so that the battery pack case 1 can accommodate more single cells 2 in a limited space, thereby improving the space utilization of the battery pack.

[0090] In another embodiment, the liquid inlet nozzle assembly 35 or the liquid outlet nozzle assembly 36 is located in the second accommodation space 320, and the functional component 9 is located in the first accommodation space 310. Alternatively, the liquid inlet nozzle assembly 35 and the functional component 9 are located in the first accommodation space 310 or the second accommodation space 320 at the same time.

[0091] like Figure 2 As shown, the thermal management system 5 further includes a transfer tube 7 extending along the first direction Y, and the transfer tube 7 is connected to both the first heat exchange tube 51 and the second heat exchange tube 52 in the second direction Z. The transfer tube 7 is arranged opposite to the current collector 6, and the current collector 6 and the transfer tube 7 are respectively arranged at two ends of each heat exchange tube (i.e., the first heat exchange tube 51 and the second heat exchange tube 52).

[0092] In order to improve the heat dissipation effect of the thermal management system 5, the transfer tube 7 can be connected to at least two heat exchange units 50. Each transfer tube 7 is connected to two heat exchange units 50. Figure 6 .like Fig.13 As shown, a second partition 71 is provided in the transfer tube 7 and is correspondingly located between the two first heat exchange tubes 51 for isolating the fluids in the two first heat exchange tubes 51 to avoid cross-flow, thereby making the cooling of the single battery 2 more uniform and avoiding excessive temperature difference.

[0093] like Figures 2 to 4As shown, in one embodiment, the battery pack includes a liquid inlet nozzle assembly 35, and the liquid inlet nozzle assembly 35 is arranged on a side of the middle beam 3 away from the single battery 2. It can be understood that Figure 2 As shown, the liquid inlet nozzle assembly 35 is disposed on the left side wall of the middle beam 3. The liquid inlet nozzle assembly 35 is located in the first accommodating space 310 or the second accommodating space 320, and the liquid inlet nozzle assembly 35 is communicated with the main liquid inlet channel 31.

[0094] like Figures 2 to 3 As shown, in one embodiment, the liquid outlet nozzle assembly 36 is arranged on the side of the middle beam 3 away from the single battery 2. It can be understood that Figure 2 As shown, the liquid outlet nozzle assembly 36 is disposed on the left side wall of the middle beam 3. The liquid outlet nozzle assembly 36 is located in the first accommodating space 341 or the second accommodating space 342, and the liquid outlet nozzle assembly 36 is connected to the total liquid outlet channel 32.

[0095] like Figures 7 to 9 As shown, in one embodiment, the middle beam 3 is provided with a total liquid inlet 304 and a total liquid outlet 305 on a surface of a side away from the single battery 2, the liquid inlet nozzle assembly 35 is installed at the total liquid inlet 304 and is connected to the total liquid inlet channel 31, and the liquid outlet nozzle assembly 36 is installed at the total liquid outlet 305 and is connected to the total liquid outlet channel 32.

[0096] The liquid inlet nozzle assembly 35 is used to transport external fluid into the battery pack, and the liquid outlet nozzle assembly 36 is used to transport the fluid inside the battery pack to the outside, so as to realize a fluid circulation loop, thereby effectively performing heat exchange treatment on the single battery 2 to achieve a cooling effect and improve the safety of the battery pack.

[0097] like Fig.15 As shown, in one embodiment, blocking members 37 are respectively provided at both ends of the middle beam 3 in the first direction Y to block the total liquid inlet channel 31 and the total liquid outlet channel 32 .

[0098] Two blocking members 37 are provided at both ends of the middle beam 3 in the first direction Y, one blocking member 37 is used to block the total liquid inlet flow channel 31, and the other blocking member 37 is used to block the total liquid outlet flow channel 32. In this way, both ends of the total liquid inlet flow channel 31 and both ends of the total liquid outlet flow channel 32 can be blocked respectively to achieve a sealing effect.

[0099] In order to improve the sealing performance between the blocking piece and the total liquid inlet channel 31 and between the blocking piece and the total liquid outlet channel 32, sealing rings (not shown) can be set between the blocking piece 37 and the total liquid inlet channel 31 and between the blocking piece 37 and the total liquid outlet channel 32.

[0100] Of course, in another embodiment, a blocking member 37 may be provided at both ends of the middle beam 3 in the first direction Y, and the total liquid inlet channel 31 and the total liquid outlet channel 32 located at the same end may be blocked by the blocking member 37 .

[0101] The blocking piece 37 is inserted into the total liquid inlet channel 31 or the total liquid outlet channel 32 and bonded to the middle beam 3. The material used for the blocking piece 37 is non-metallic, such as plastic. The middle beam 3 and the box body 1 are connected by welding to form a weld mark, that is, the middle beam 3 and the first side beam 12 are connected by welding. Among them, the weld mark and the blocking piece 37 are arranged at intervals, so that the heat generated during welding of the middle beam 3 and the first side beam 12 can be avoided from melting the blocking piece 37. The blocking form for the liquid inlet channel is not limited to the above, and can also be: the middle beam 3 and the blocking piece 37 are connected by welding. At this time, the material used for the blocking piece 37 is a metal material.

[0102] The middle beam 3 is an extrusion molding structure, and the middle beam 3 is provided with a plurality of cavities 39 extending along the first direction Y and penetrating the middle beam 3. In this way, the structural stability of the middle beam 3 is effectively guaranteed, and the risk of bending of the middle beam 3 is reduced, thereby ensuring the reliability of the use of the middle beam 3 and reducing the weight of the middle beam 3.

[0103] like Fig.16 As shown, the blocking member 37 is provided with a fixing hole 311 communicating with the cavity 39 .

[0104] The battery pack further includes a fixing member 321 , which passes through the fixing hole 311 and is located in the cavity 39 to fix the blocking member 37 .

[0105] Fig.15 It is shown that the total liquid inlet channel 31 and the total liquid outlet channel 32 are arranged adjacent to each other in the second direction Z. In some embodiments, at least one cavity 39 is provided between the total liquid inlet channel 31 and the total liquid outlet channel 32 in the second direction Z, that is, the total liquid outlet channel 32 is spaced apart from the total liquid outlet channel 32 in the second direction Z by the cavity 39. When the blocking member 37 is fixed to the end of the middle beam 3 by locking, refer to Fig.16 A plurality of locking points may be provided on the blocking member 37 to increase the connection strength between the blocking member 37 and the middle beam 3 .

[0106] like Figure 1 and Figure 2As shown, in one embodiment, each single cell 2 includes two poles 21. In the same single cell 2, the first heat exchange tube 51 is arranged on one of the two poles 21, and the second heat exchange tube 52 is arranged on the other of the two poles 21, wherein the first heat exchange tube 51 and the second heat exchange tube 52 are configured to exchange heat with the pole 21. Specifically, since the pole 21 is the connection point between the single cell 2 and the external circuit, when the single cell 2 is in operation, due to the effect of heat conduction, heat will be transferred from the heat inside the single cell 2 to the pole 21. Therefore, the first heat exchange tube 51 and the second heat exchange tube 52 of the heat exchange unit 50 are arranged on the pole 21, so that the distance between the first heat exchange tube 51 and the pole 21 can be minimized, and the distance between the second heat exchange tube 52 and the pole 21 can be minimized. In this way, heat dissipation can be prevented by dissipating heat from the pole 21, so that the single cell 2 is cooled quickly, the heat exchange requirements of the power battery are met, and the safety of the battery pack is improved.

[0107] In one embodiment, the first heat exchange tube 51 and the second heat exchange tube 52 are respectively arranged on the two poles 21 of the same single cell 2, and the fluid flows from the first heat exchange tube 51 to the second heat exchange tube 52 to exchange heat with the pole 21. Specifically, each single cell 2 may include a positive pole 21 and a negative pole 21 located on the same side, and the positive poles 21 of multiple single cells 2 are arranged along the third direction X, and the negative poles 21 of multiple single cells 2 are arranged along the third direction X. In the same battery pack, the first heat exchange tube 51 is arranged on the positive pole 21 along the third direction X, and the second heat exchange tube 52 is arranged on the negative pole 21 along the third direction X, so that the positive and negative poles 21 can be directly dissipated on the same single cell 2, and the circulation of the fluid can be realized, so that the cooling of the single cell 2 is more uniform.

[0108] like Figure 18 to Figure 19 As shown, in one embodiment, the inner wall of the total liquid inlet flow channel 31 is provided with a first thermal insulation layer 81, so that the fluid in the total liquid inlet flow channel 31 can be insulated, and the heat can be prevented from being transferred to the middle beam 3, thereby preventing the fluid temperatures in the total liquid inlet flow channel 31 and the total liquid outlet flow channel 32 from affecting each other. Alternatively, the inner wall of the total liquid outlet flow channel 32 is provided with a second thermal insulation layer 82, which can also prevent the heat from being transferred to the middle beam 3, thereby effectively preventing the fluid temperatures in the total liquid inlet flow channel 31 and the total liquid outlet flow channel 32 from affecting each other. Optionally, the inner wall of the total liquid inlet flow channel 31 is provided with a first thermal insulation layer 81, and the inner wall of the total liquid outlet flow channel 32 is provided with a second thermal insulation layer 82, so that the heat can be further prevented from being transferred to the middle beam 3, thereby further preventing the fluid temperatures in the total liquid inlet flow channel 31 and the total liquid outlet flow channel 32 from affecting each other.

[0109] The materials used for the first thermal insulation layer 81 and the second thermal insulation layer 82 can both be foam or the like.

[0110] The embodiment of the present application also provides an electrical device, including the above-mentioned battery pack, which serves as a power supply for the electrical device. The electrical device can be a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric car, a ship, a spacecraft, an electric toy, and an electric tool. For example, spacecraft include airplanes, rockets, space shuttles, and spacecrafts; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0111] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0112] The above is a detailed introduction to a battery pack and an electrical device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction, a second direction and a third direction intersecting in pairs, and comprises: A box body, wherein the box body has a containing cavity; a plurality of single cells; and, A middle beam, wherein the middle beam is arranged in the accommodating cavity and connected to the box body to divide the accommodating cavity into a first space and a second space distributed along the third direction, a plurality of single cells are arranged in the first space and connected to the middle beam, the middle beam is provided with a total liquid inlet flow channel and a total liquid outlet flow channel both extending along the first direction, the total liquid inlet flow channel and the total liquid outlet flow channel are arranged along the second direction, and the second space is formed as a buffer space or an installation space.

2. The battery pack according to claim 1, characterized in that: The battery pack further comprises: A thermal management system is disposed on one side of the single battery along the second direction, and the thermal management system includes a plurality of heat exchange units arranged along the first direction. The heat exchange unit includes a first heat exchange tube and a second heat exchange tube both extending along the third direction. The first heat exchange tube and the second heat exchange tube are spaced apart along the first direction and are connected to each other. The first heat exchange tube is connected to the total liquid inlet channel, and the second heat exchange tube is connected to the total liquid outlet channel.

3. The battery pack according to claim 2, characterized in that: The battery pack further comprises a plurality of adapters, wherein the plurality of adapters are arranged at intervals along the first direction on a side of the middle beam away from the single battery; The adapter connects the total liquid inlet channel and the first heat exchange tube, and / or the adapter connects the total liquid outlet channel and the second heat exchange tube.

4. The battery pack according to claim 3, characterized in that: An accommodating space is formed between two adjacent adapters, and the battery pack further includes: A water nozzle assembly, the water nozzle assembly is arranged on a side of the middle beam away from the single battery and is connected to the total liquid inlet flow channel and / or the total liquid outlet flow channel; The faucet assembly is located in the accommodating space, and the faucet assembly is communicated with the total liquid inlet channel and / or the total liquid outlet channel.

5. The battery pack according to claim 3, characterized in that: An accommodating space is formed between two adjacent adapters, and the battery pack further includes a functional component, which is disposed in the accommodating space.

6. The battery pack according to claim 2, characterized in that: Also includes: a current collector extending along the first direction and communicating with the first heat exchange tube and the second heat exchange tube in the third direction, wherein the current collector is connected to ends of at least two of the first heat exchange tube and the second heat exchange tube; a plurality of first connecting tubes extending along the second direction and communicating with the current collector, wherein the first connecting tubes are arranged on a side close to the single battery; A plurality of second connecting tubes extend along the second direction and are connected to the current collector, and the second connecting tubes are arranged on a side close to the single battery.

7. The battery pack according to claim 1, characterized in that: A blocking piece is provided at one end of the middle beam in the first direction, and the blocking piece is used to block the total liquid inlet flow channel and the total liquid outlet flow channel.

8. The battery pack according to claim 7, characterized in that: The blocking member is inserted into the total liquid inlet flow channel or the total liquid outlet flow channel and bonded to the middle beam, wherein the blocking member is made of non-metallic material; The middle beam and the box body are connected by welding to form a weld mark, and the weld mark is spaced apart from the blocking member.

9. The battery pack according to claim 7, characterized in that: The middle beam and the blocking member are connected by welding.

10. The battery pack according to claim 1, characterized in that: The middle beam is provided with a cavity and a first locking hole, the cavity and the first locking hole are both disconnected from the total liquid inlet channel and the total liquid outlet channel, the cavity extends along the first direction and passes through the middle beam, and the first locking hole extends along the third direction and communicates with the cavity; The box body comprises a first side beam extending along the third direction, and the first side beam is provided with a second locking hole; The battery pack further comprises: A connecting member, the connecting member connecting the middle beam and the first side beam, the connecting member being provided with a first connecting hole and a second connecting hole, the first connecting hole being arranged opposite to the first locking hole, and the second connecting hole being arranged opposite to the second locking hole; a first fastener, which is inserted into the first connecting hole and the first locking hole and connects the middle beam and the connecting member; The second fastener is inserted into the second connecting hole and the second locking hole and connects the connecting member and the first side beam.

11. The battery pack according to claim 10, characterized in that: At least one cavity is provided between the total liquid inlet flow channel and the total liquid outlet flow channel in the second direction.

12. The battery pack according to claim 2, characterized in that: Fluid flows through the first heat exchange tube and the second heat exchange tube. Each of the single cells includes two poles. In the same single cell, the first heat exchange tube is arranged on one of the two poles, and the second heat exchange tube is arranged on the other of the two poles. The fluid flows from the first heat exchange tube to the second heat exchange tube to exchange heat with the poles.

13. The battery pack according to claim 1, characterized in that: The inner wall of the total liquid inlet channel is provided with a first thermal insulation layer; and / or, The inner wall of the total liquid outlet channel is provided with a second thermal insulation layer.

14. An electrical device, characterized in that: It comprises a battery pack as claimed in any one of claims 1 to 13, wherein the battery pack is used to provide electrical energy to the electrical device.

Images