Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack, which comprises: a box body provided with a cavity; the battery pack is arranged in the cavity; the thermal management system is arranged between the box body and the battery pack; the heat management system comprises a collecting pipe, the collecting pipe extends in the second direction, and the collecting pipe is provided with a main liquid inlet flow channel and a main liquid outlet flow channel which are spaced in the third direction; the multiple heat exchange pipes are arranged in the second direction at intervals and extend in the third direction, each heat exchange pipe comprises a first branch flow channel and a second branch flow channel which are arranged in the second direction and are in fluid communication with each other, the first branch flow channels are communicated with the main liquid inlet flow channel, and the second branch flow channels are communicated with the main liquid outlet flow channel. The number of connecting points of the pipeline can be reduced, and the utilization rate and the energy density of the internal space of the battery pack can be improved.

Description

Technical Field

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

[0002] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application of power batteries continues to expand, market demand is also growing. Thermal management systems are often incorporated into battery packs to regulate their operating temperature. However, this significantly impacts the battery pack's volume utilization and energy density. The high number of connection points in thermal management systems also reduces reliability. Utility Model Content

[0003] The purpose of the present utility model is to provide a battery pack to solve the technical problem that the volume utilization rate and energy density of the battery pack are reduced due to excessive internal heat.

[0004] To achieve the above-mentioned purpose, the present invention provides a battery pack having a first direction, a second direction and a third direction intersecting in pairs, the battery pack comprising: a box body provided with a cavity; a battery pack arranged in the cavity; and a thermal management system, the thermal management system being arranged between the box body and the battery pack; wherein the thermal management system comprises: a collecting pipe, the collecting pipe extending along the second direction, the collecting pipe being provided with a total liquid inlet flow channel and a total liquid outlet flow channel spaced along the third direction; and a plurality of heat exchange tubes, the plurality of heat exchange tubes being spaced apart in the second direction and extending along the third direction, the plurality of heat exchange tubes being connected to the collecting pipe, the heat exchange tubes comprising a first branch flow channel and a second branch flow channel arranged along the second direction and fluidically connected to each other, the first branch flow channel being connected to the total liquid inlet flow channel, and the second branch flow channel being connected to the total liquid outlet flow channel.

[0005] In some embodiments, the header is in communication with the plurality of heat exchange tubes in a first direction, and the header is connected to ends of the plurality of heat exchange tubes.

[0006] In some embodiments, the collector is disposed on a side of the heat exchange tube close to the battery pack; or the collector is disposed on a side of the heat exchange tube away from the battery pack.

[0007] In some embodiments, the collecting pipe is provided with a plurality of liquid separation holes and a plurality of liquid return holes, the plurality of liquid separation holes are spaced apart in the second direction, and the plurality of liquid return holes are spaced apart in the second direction, wherein the liquid separation holes are connected to the total liquid inlet channel and the first branch channel, and the liquid return holes are connected to the total liquid outlet channel and the second branch channel.

[0008] In some embodiments, the collecting pipe is provided with a first water nozzle assembly at one end in the second direction and a second water nozzle assembly at the other end. The first water nozzle assembly is connected to the total liquid inlet channel, and the second water nozzle assembly is connected to the total liquid outlet channel.

[0009] In some embodiments, a first plug is provided at one end of the heat exchange tube in the third direction and a second plug is provided at the other end. The first plug is used to seal one end of the heat exchange tube, and the second plug is used to seal the other end of the heat exchange tube, and the first branch flow channel and the second branch flow channel are connected to form a U-shaped flow channel.

[0010] In some embodiments, the battery pack includes a single battery cell, the single battery cell includes a pole, and the heat exchange tube is configured to exchange heat with the pole.

[0011] In some embodiments, the single battery cell includes a cover and a shell, the cover is arranged on the shell in a first direction, the pole is arranged on the cover, and the heat exchange tube is arranged on a side of the pole away from the shell.

[0012] In some embodiments, the battery pack further includes a plurality of connecting plates, and the poles of two adjacent single battery cells are connected by the connecting plates, and the connecting plates are arranged between the poles and the heat exchange tubes in the first direction.

[0013] In some embodiments, the battery pack also includes a plurality of fixing parts, the fixing parts including a contact portion and a fixing portion, the contact portion is arranged on one side of the heat exchange tube and the connecting plate in the first direction, the fixing portion is arranged on both sides of the contact portion in the second direction, and the fixing portion is bent and extended in the first direction to fix the heat exchange tube.

[0014] In some embodiments, an outer surface of the heat exchange tube is provided with an insulating layer; or, the heat exchange tube is made of an insulating material.

[0015] In some embodiments, the battery pack further includes a buffer member disposed between the thermal management system and the box body in the first direction.

[0016] The technical effect of the present invention is to provide a battery pack, which adopts a collecting pipe to connect multiple heat exchange tubes in series, that is, the collecting pipe integrates the functions of liquid inlet, liquid outlet and collecting, which can reduce the number of pipe connections, thereby improving the reliability of the battery pack, and the total liquid outlet flow channel and the total liquid inlet flow channel are arranged in the third direction, and the first branch flow channel and the second branch flow channel are arranged in the second direction, which can minimize the occupation of the thermal management system in the first direction, which is beneficial to improving the volume utilization and energy density of the battery pack; wherein the fluid can flow from the total liquid inlet flow channel to the branch flow channel of the heat exchange tube, and converge from the branch flow channel to the total liquid outlet flow channel to dissipate heat to the battery pack, avoid excessive internal heat of the battery pack, and improve the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0018] Figure 1 Schematic diagram of the explosion structure of the battery pack provided in the embodiment of the present application Figure 1 .

[0019] Figure 2 Schematic diagram of the explosion structure of the battery pack provided in the embodiment of the present application Figure 2 .

[0020] Figure 3 A schematic diagram of the structure of the thermal management system provided in an embodiment of the present application.

[0021] Figure 4 for Figure 3 A partial enlarged view of the middle Q area.

[0022] Figure 5 Schematic diagram of the structure of the manifold provided in the embodiment of the present application Figure 1 .

[0023] Figure 6 Schematic diagram of the structure of the manifold provided in the embodiment of the present application Figure 2 .

[0024] Figure 7 A schematic diagram of the structure of the cooling tube provided in an embodiment of the present application.

[0025] Figure 8 A schematic structural diagram of the first plug provided in an embodiment of the present application.

[0026] Figure 9 A schematic structural diagram of the second plug provided in an embodiment of the present application.

[0027] Figure 10 A partial cross-sectional view of the battery pack provided in an embodiment of the present application in the second direction.

[0028] Figure 11 for Figure 10 A partial enlarged view of part I in the middle.

[0029] Figure 12 for Figure 11 Enlarged view of the fixings.

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

[0031] Z-first direction; Y-second direction; X-third direction;

[0032] 1-Box body; 11-Bottom plate; 12-Top plate; 13-Side plate; 10-Cavity;

[0033] 2-battery pack; 21-single cell; 211-electrode; 212-cover; 213-housing;

[0034] 3- thermal management system; 31- manifold; 311- total liquid inlet flow channel; 312- total liquid outlet flow channel;

[0035] 313-liquid separation hole; 314-liquid return hole;

[0036] 32-heat exchange tube; 321-first branch flow channel; 322-second branch flow channel; 323-partition; 324-connecting port;

[0037] 323-liquid inlet; 324-liquid outlet;

[0038] 41-first faucet assembly; 42-second faucet assembly;

[0039] 411-first faucet head; 412-first connecting pipe; 4111-first partition; 4112-first diversion port;

[0040] 421 - second faucet head; 422 - second connecting pipe; 4211 - first partition; 4212 - first diversion port;

[0041] 51-first plug; 52-second plug;

[0042] 6-connecting piece;

[0043] 7-fixing member; 71-contact portion; 72-fixing portion;

[0044] 8-Buffer. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not 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 efforts are within the scope of protection of this application.

[0046] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0048] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, 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, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" 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 absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0050] To address the technical problem of excessive internal heat in a battery pack affecting battery life, embodiments of the present application provide a battery pack comprising a housing, a battery pack, and a thermal management system. The housing comprises a cavity, the battery pack being disposed within the cavity, and the thermal management system being disposed between the housing and the battery pack. The thermal management system comprises a header and a plurality of heat exchange tubes. The header extends in a second direction and is provided with a main liquid inlet channel and a main liquid outlet channel spaced apart from each other. The plurality of heat exchange tubes are spaced apart in the second direction and extend in a third direction. The heat exchange tubes comprise first and second branch channels spaced apart and fluidically connected to each other. The first branch channel is connected to the main liquid inlet channel, and the second branch channel is connected to the main liquid outlet channel. Thus, a single header is used to connect the plurality of heat exchange tubes in series, allowing fluid to branch from the main liquid inlet channel to the branch channels of the heat exchange tubes, and then converge from the branch channels to the main liquid outlet channel. This effectively dissipates heat from the battery pack, prevents excessive internal heat buildup in the battery pack, and improves battery life. This also reduces the number of pipe connections and the space occupied by the pipes within the housing. A detailed explanation will be given below.

[0051] In one embodiment, if Figure 1 and Figure 2 As shown, the battery pack has a first direction Z, a second direction Y, and a third direction X that intersect each other. It is understood that in some embodiments, the first direction Z is the thickness direction of the battery pack, the second direction Y is the width direction of the battery pack, and the third direction X is the length direction of the battery pack.

[0052] like Figure 1 and Figure 2 As shown, the battery pack includes a box 1, a battery group 2 and a thermal management system 3.

[0053] The box body 1 includes a bottom plate 11, a top plate 12 and multiple side plates 13. The multiple side plates 13 are connected to the edges of the bottom plate 11 in a first direction Z to enclose a cavity 10, and the cavity 10 has an opening. The top plate 12 covers the opening to form a sealed box body 1.

[0054] The battery pack 2 is disposed in the cavity 10 and includes a plurality of battery cells 21 arranged in a matrix.

[0055] The thermal management system 3 is disposed between the housing 1 and the battery pack 2. The thermal management system 3 may include a manifold 31 and a plurality of heat exchange tubes 32 to dissipate heat from the battery pack 2 and improve the safety of the battery pack.

[0056] In one embodiment, the manifold 31 is disposed on the side of the heat exchange tube 32 close to the battery pack 2 to achieve heat dissipation for the battery pack 2. Figure 1 The header 31 shown is arranged below the heat exchange tube 32. Figure 2 The illustrated manifold 31 is disposed above the heat exchange tube 32. In another embodiment, the manifold 31 is disposed on the side of the heat exchange tube 32 away from the battery pack 2, as long as the heat dissipation function for the battery pack 2 can be achieved.

[0057] like Figure 3 and Figure 4 As shown, the manifold 31 extends along the second direction Y and is provided with a total liquid inlet flow channel 311 and a total liquid outlet flow channel 312 spaced apart along the third direction X. In this way, the functions of liquid inlet, liquid outlet, and liquid collection are integrated in the same manifold 31, reducing the number of pipe connections, improving the integration of the battery pack, and reducing manufacturing costs. The reduction in the number of pipe connections can also reduce the number of connection points, thereby reducing the probability of connection failure within the thermal management system and thus improving the reliability of the battery pack. In addition, the total liquid inlet flow channel 311 and the total liquid outlet flow channel 312 are arranged along the third direction X, which can reduce the space occupied in the first direction Z, improve the volume utilization and energy density of the battery pack, and at the same time reduce the height of the battery pack, thereby enabling the battery pack to be arranged behind the vehicle to improve the ground clearance of the chassis.

[0058] like Figure 3 and Figure 4 As shown, multiple heat exchange tubes 32 are spaced apart in the second direction Y and extend along the third direction X. Each of the multiple heat exchange tubes 32 is connected to the manifold 31. The heat exchange tubes 32 include first and second branch channels 321, 322 arranged along the second direction Y and in fluid communication with each other. The first branch channel 321 is in communication with the main liquid inlet channel 311, and the second branch channel 322 is in communication with the main liquid outlet channel 312. Compared to a structure in which the liquid inlet and liquid outlet are provided at each end of the heat exchange tube 32, fluid inflow and outflow are achieved at the same end of the heat exchange tube 32. This further reduces the number of pipe connections, thereby improving the utilization of the internal space of the battery pack and reducing the number of connection nodes, thereby enhancing the reliability of the battery pack. In addition, the arrangement of the first and second branch channels 321, 322 along the second direction Y also reduces the space occupied in the first direction Z, thereby improving the volume utilization and energy density of the battery pack.

[0059] Figure 3 and Figure 4 Schematically, each first branch channel 321 is connected to the main liquid inlet channel 311, and each second branch channel 322 is connected to the main liquid outlet channel 312. In other embodiments, some of the first branch channels 321 may be connected to the main liquid inlet channel 311, and some of the second branch channels 322 may be connected to the main liquid outlet channel 312, which is not particularly limited here.

[0060] Therefore, multiple heat exchange tubes 32 are connected in series through the collecting pipe 31, and the fluid can branch out from the total liquid inlet channel 311 and flow to the first branch channel 321 and the second branch channel 322 of the heat exchange tube 32 in sequence. Multiple second branch channels 322 converge into the total liquid outlet channel 312, so as to reduce the heat dissipation to the battery pack 2 while reducing the number of pipe connections and reducing the space occupied by the pipes in the box 1.

[0061] In one embodiment, if Figure 3 and Figure 4 As shown, the header 31 is connected to the plurality of heat exchange tubes 32 in the first direction Z, and the header 31 is close to the ends of the plurality of heat exchange tubes 32, for example, Figure 1 It is shown that the collecting tube 31 is arranged at the left end of the heat exchange tube 32. In this way, one collecting tube 31 integrates multiple heat exchange tubes 32 into one, which is conducive to better and faster assembly, and can reduce the space occupied by the pipeline in the third direction X of the battery pack, thereby improving the space utilization of the battery pack.

[0062] In one embodiment, if Figures 4 to 6 As shown, the manifold 31 is provided with a plurality of liquid separation holes 313 and a plurality of liquid return holes 314. The plurality of liquid separation holes 313 are spaced apart in the second direction Y, and the plurality of liquid return holes 314 are spaced apart in the second direction Y. The liquid separation holes 313 are staggered from the liquid return holes 314 in the second direction Y and the third direction X. The liquid separation holes 313 communicate with the main liquid inlet channel 311 and the first branch channel 321, while the liquid return holes 314 communicate with the main liquid outlet channel 312 and the second branch channel 322, thereby forming a heat exchange circuit for the battery pack 2, achieving effective heat exchange for the battery pack 2 and meeting the heat exchange requirements of the power batteries.

[0063] like Figure 4 and Figure 7As shown, the heat exchange tube 32 is provided with a plurality of liquid inlet holes 323 and a plurality of liquid outlet holes 324, wherein the plurality of liquid inlet holes 323 are spaced apart in the second direction Y, and the plurality of liquid outlet holes 324 are spaced apart in the second direction Y, and the liquid inlet holes 323 and the liquid outlet holes 324 are staggered, wherein each liquid inlet hole 323 is connected to a liquid separation hole 313, and each liquid outlet hole 324 is connected to a liquid return hole 314, so that each heat exchange tube 32 forms a separate sub-heat exchange loop, so that each sub-heat exchange loop can dissipate heat for each row of single battery cells 21 separately, thereby improving the cooling effect, and when a heat exchange tube 32 fails, the other heat exchange tubes 32 can still work normally, thereby improving the reliability of the battery pack.

[0064] like Figure 1 As shown, when the manifold 31 is arranged on the side of the heat exchange tube 32 close to the battery pack 2, the multiple liquid separation holes 313 of the manifold 31 are arranged on the side of the manifold 31 away from the battery pack 2, and the multiple liquid return holes 314 are arranged on the side of the manifold 31 away from the battery pack 2, that is, Figure 1 The upper surface of the middle manifold 31 is provided with a plurality of liquid separation holes 313 and a plurality of liquid return holes 314. Figure 2 As shown, when the manifold 31 is arranged on the side of the heat exchange tube 32 away from the battery pack 2, the multiple liquid separation holes 313 of the manifold 31 are arranged on the side of the manifold 31 close to the battery pack 2, and the multiple liquid return holes 314 are arranged on the side of the manifold 31 close to the battery pack 2, that is, Figure 2 The upper surface of the middle manifold 31 is provided with a plurality of liquid separation holes 313 and a plurality of liquid return holes 314. Figure 1 and Figure 2 The positions of the middle liquid separation hole 313 and the liquid return hole 314 are based on the position of the manifold 31 .

[0065] Compared with the case where the collecting pipe 31 is arranged on the side of the heat exchange tube 32 away from the battery pack 2, the collecting pipe 31 is arranged on the side of the heat exchange tube 32 close to the battery pack 2, which can further reduce the space occupied by the battery pack in the first direction Z (thickness / height direction) to further improve the space utilization of the battery pack and the battery energy density.

[0066] In this embodiment, the collecting pipe 31 is set at the same end of multiple heat exchange tubes 32. The collecting pipe 31 is connected with the heat exchange tubes 32 in the first direction Z to form a heat exchange circuit. While the heat exchange circuit performs heat exchange treatment on the single battery cells 21, it can also further reduce the space occupied by the pipeline inside the battery pack, which is beneficial to improving the utilization rate of the internal space of the battery pack and the battery energy density.

[0067] In one embodiment, if Figure 1 and Figure 2As shown, the single cell 21 includes a post 211, a cover 212, and a housing 213. The cover 212 is disposed on the housing 213 in the first direction Z, and the post 211 is disposed on the cover 212. Specifically, the cover 212 is provided with a through hole for accommodating the post 211. One end of the post 211 extends into the interior of the housing 213, and the other end is exposed on the surface of the cover 212. The post 211 includes a positive post and a negative post, respectively located on either side of the cover 212 in the second direction Y.

[0068] In one embodiment, the heat exchange tube 32 is configured to exchange heat with the pole 211. Optionally, the heat exchange tube 32 is disposed on a side of the pole 211 facing away from the housing 213. Figure 1 The heat exchange tube 32 is shown as being disposed above the pole 211. Since the pole 211 is the connection point between the single cell 21 and the external circuit, during operation of the single cell 21, heat is transferred from the internal heat of the single cell 21 to the pole 211 due to heat conduction. Therefore, the heat exchange tube 32 is disposed on the side of the pole 211 facing away from the housing 213, minimizing the distance between the heat exchange tube 32 and the pole 211. This dissipates heat from the pole 211, prevents heat diffusion, and rapidly cools the single cell 21, meeting the heat exchange requirements of the power battery and improving the safety of the battery pack.

[0069] In one embodiment, if Figure 5 and Figure 6 As shown, the battery pack further includes a first water faucet assembly 41 and a second water faucet assembly 42 .

[0070] Specifically, the manifold 31 is provided with a first faucet assembly 41 at one end in the second direction Y, and a second faucet assembly 42 at the other end. The first faucet assembly 41 is connected to the main liquid inlet channel 311, and the second faucet assembly 42 is connected to the main liquid outlet channel 312. This allows the two faucet assemblies to be located at either end of the heat exchange tube 32, reducing the number of pipes in the thermal management system 3 and the space occupied by the pipes within the battery pack, thereby improving the internal space utilization of the battery pack and the battery energy density.

[0071] like Figure 8 As shown, the first faucet assembly 41 includes a first faucet head 411 and a first connecting pipe 412 connected to the faucet head. The first faucet head 411 is provided with a first partition 4111. The first partition 4111 is provided with a first guide port 4112 connected to the first connecting pipe 412. The first partition 4111 is used to block the total liquid outlet channel 312, and the first guide port 4112 is used to transport fluid. The first faucet head 411 can also be provided with a valve core and a guide device. The valve core is used to control the switch of the fluid, and the guide device is used to adjust the inlet flow rate of the fluid. Similarly, as Figure 9As shown, the second faucet assembly 42 includes a second faucet head 421 and a second connecting pipe 422 connected thereto. The second faucet head 421 is provided with a second partition 4211, which defines a second flow guide port 4212 that communicates with the second connecting pipe 422. The second partition 4211 is used to block the main liquid inlet channel 311, and the second flow guide port 4212 is used to transport fluid. The second faucet head 421 may also be provided with a valve core and a flow guide. The valve core is used to control the on / off of the fluid, and the flow guide is used to regulate the outflow of the fluid.

[0072] In one embodiment, if Figure 3 and Figure 4 As shown, the battery pack further includes a first plug 51 and a second plug 52 .

[0073] Specifically, the heat exchange tube 32 is provided with a first plug 51 at one end in the third direction X, and a second plug 52 at the other end. The first plug 51 is used to seal one end of the heat exchange tube 32 ( Figure 4 The second plug 52 is used to seal the other end of the heat exchange tube 32 ( Figure 4 The first branch channel 321 and the second branch channel 322 are connected to form a U-shaped channel. This reduces the flow rate of a single heat exchange tube 32, effectively reducing the volume of the plug of the thermal management system 3 and the space occupied by the battery pack.

[0074] In one embodiment, if Figure 7 As shown, the heat exchange tube 32 also includes a partition 323, which is arranged between the first branch flow channel 321 and the second branch flow channel 322 in the third direction X, and is used to separate the first branch flow channel 321 and the second branch flow channel 322. The right end of the heat exchange tube 32 is provided with a connecting port 324, which is used to connect the first branch flow channel 321 and the second branch flow channel 322, and allow the fluid to flow from the first branch flow channel 321 to the second branch flow channel 322. In addition, the first plug 51 and the second plug 52 block the left and right ends of the heat exchange tube 32 to prevent the fluid from flowing out. In other embodiments, the right end of the heat exchange tube 32 does not have a connecting port 324, and the second plug 52 is provided with a connecting hole (not shown) for connecting the first branch flow channel 321 and the second branch flow channel 322, and the connecting hole can allow the fluid to flow from the first branch flow channel 321 to the second branch flow channel 322.

[0075] In one embodiment, the outer surface of the heat exchange tube 32 is provided with an insulating layer, which may be made of epoxy material. The thickness of the insulating layer may be 0.2 to 0.3 mm. The insulating layer may cover the entire outer surface of the heat exchange tube 32, or may cover only a portion of the outer surface of the heat exchange tube 32 (e.g., the side closest to the battery pack 2). It is understood that the thickness of the insulating layer (unit: mm) may be any value among 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, or a value between any two values. Within this thickness range, the single cell 21 can meet a DC 2800V voltage and maintain a leakage current of less than 1 mA within 60 seconds, effectively preventing short circuits between battery electrodes. In another embodiment, the heat exchange tube 32 is made of an insulating material, thereby avoiding the need for an additional insulating layer and reducing manufacturing costs. Furthermore, heat exchange tubes 32 made directly of insulating material have a lower probability of breakdown, significantly reducing the risk of short circuits.

[0076] In one embodiment, if Figure 1 and Figure 2 As shown, the battery pack also includes multiple connecting plates 6. The poles 211 of two adjacent single cells 21 are connected by the connecting plates 6 in the third direction X. The connecting plates 6 are arranged between the poles 211 and the heat exchange tubes 32 in the first direction Z. It will be understood that the heat exchange tubes 32 of the thermal management system 3 are thermally connected to the connecting plates 6, and the temperature of the connecting plates 6 is transferred to the heat exchange tubes 32 through heat conduction, thereby reducing the temperature of the single cells 21. Due to the high heat conduction efficiency of the poles 211, cooling the connecting plates 6 can quickly reduce the internal temperature of the single cells 21.

[0077] Optionally, each connecting piece 6 is arranged between the pole 211 of each single battery cell 21 and the heat exchange tube 32 in the first direction Z, so that the single battery cell 21 can be further cooled to achieve a rapid cooling effect.

[0078] In one embodiment, if Figure 1 and Figure 2 As shown, since the connecting piece 6 is uneven, a heat-conducting structural adhesive or other filling materials with heat-conducting function are provided between the connecting piece 6 and the thermal management system 3 to fill the air gap well and increase the cooling area.

[0079] In one embodiment, if Figure 1 、 Figure 2 、 Figure 10 、 Figure 11 as well as Figure 12As shown, the battery pack further includes a plurality of fixing members 7. The fixing member 7 includes a contact portion 71 and a fixing portion 72. The contact portion 71 is disposed on the heat exchange tube 32 in the first direction Z and on the side close to the connecting piece 6. The fixing portion 72 extends by bending in the first direction Z on both sides of the contact portion 71 in the second direction Y to fix the heat exchange tube 32. It can be understood that the fixing member 7 has a "U" - shaped structure to partially wrap the heat exchange tube 32 and prevent the thermal management system 3 from shaking (such as moving left and right).

[0080] Optionally, the fixing member 7 and the heat exchange tube 32 can be fixed by adhesion.

[0081] In one embodiment, as Figure 1 and Figure 2 shown, the battery pack further includes a buffer member 8. The buffer member 8 is disposed between the thermal management system 3 and the box body 1 in the first direction Z.

[0082] Specifically, the lower surface of the buffer member 8 is adhesively bonded to the thermal management system 3, and the upper surface of the buffer member 8 is bonded to the top plate 12. After bonding the top plate 12 and the thermal management system 3 together, the top plate 12 and the thermal management system 3 can form an integral component, avoiding the top plate 12 vibrating violently during movement and thus generating a large amount of noise.

[0083] Optionally, the buffer member 8 can be a foam, and the main material of the foam is a foaming material such as polyurethane or PPO.

[0084] The embodiment of the present application provides a battery pack. A collector tube 31 is used to connect a plurality of heat exchange tubes 32 in series, enabling the fluid to branch from the total inlet flow channel 311 to the branch flow channels of the heat exchange tubes 32 and converge from the branch flow channels to the total outlet flow channel 312, so as to achieve heat dissipation for the battery pack 2, avoid excessive internal heat of the battery pack, improve the service life of the battery, and reduce the number of pipeline connections and the occupied space of the pipeline in the box body 1.

[0085] In the above - mentioned embodiments, the descriptions of each embodiment have their own focuses. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0086] The above has introduced in detail a battery pack provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features; and 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 includes: The box body is provided with a cavity; a battery pack, disposed in the cavity; and a thermal management system disposed between the box and the battery pack; Wherein, the thermal management system includes: a manifold extending along the second direction and provided with a total liquid inlet flow channel and a total liquid outlet flow channel spaced apart along the third direction; and Multiple heat exchange tubes are arranged at intervals in the second direction and extend along the third direction. Multiple heat exchange tubes are all connected to the collecting pipe. The heat exchange tubes include a first branch flow channel and a second branch flow channel arranged along the second direction and fluidically connected to each other, the first branch flow channel is connected to the total liquid inlet flow channel, and the second branch flow channel is connected to the total liquid outlet flow channel.

2. The battery pack according to claim 1, characterized in that: The header is in communication with the plurality of heat exchange tubes in the first direction, and the header is connected to ends of the plurality of heat exchange tubes.

3. The battery pack according to claim 2, characterized in that: The collecting pipe is arranged on a side of the heat exchange tube close to the battery pack; or The collecting pipe is arranged on a side of the heat exchange tube away from the battery pack.

4. The battery pack according to claim 1, characterized in that: The collecting pipe is provided with a plurality of liquid separation holes and a plurality of liquid return holes, wherein the plurality of liquid separation holes are spaced apart in the second direction, and the plurality of liquid return holes are spaced apart in the second direction, wherein the liquid separation holes are connected with the total liquid inlet channel and the first branch channel, and the liquid return holes are connected with the total liquid outlet channel and the second branch channel.

5. The battery pack according to claim 1, characterized in that: The collecting pipe is provided with a first water nozzle assembly at one end in the second direction and a second water nozzle assembly at the other end. The first water nozzle assembly is connected to the total liquid inlet channel, and the second water nozzle assembly is connected to the total liquid outlet channel.

6. The battery pack according to claim 5, characterized in that: The heat exchange tube is provided with a first plug at one end in the third direction and a second plug at the other end. The first plug is used to seal one end of the heat exchange tube, and the second plug is used to seal the other end of the heat exchange tube, so that the first branch flow channel and the second branch flow channel are connected to form a U-shaped flow channel.

7. The battery pack according to claim 1, characterized in that: The battery pack includes a single battery cell, each of which includes a pole, and the heat exchange tube is configured to exchange heat with the pole.

8. The battery pack according to claim 7, characterized in that: The single battery cell includes a cover and a shell, the cover is arranged on the shell in the first direction, and the pole is arranged on the cover; The heat exchange tube is arranged on a side of the pole away from the shell.

9. The battery pack according to claim 7, characterized in that: The battery pack further includes a plurality of connecting plates, through which the poles of two adjacent single cells are connected, and the connecting plates are arranged between the poles and the heat exchange tubes in the first direction.

10. The battery pack according to claim 9, characterized in that: The battery pack also includes a plurality of fixing parts, each of which includes a contact portion and a fixing portion. The contact portion is arranged on one side of the heat exchange tube and the connecting piece in the first direction, and the fixing portion is arranged on both sides of the contact portion in the second direction. The fixing portion is bent and extended in the first direction to fix the heat exchange tube.

11. The battery pack according to claim 1, characterized in that: The outer surface of the heat exchange tube is provided with an insulating layer; or, The heat exchange tube is made of insulating material.

12. The battery pack according to claim 1, characterized in that: The battery pack further includes a buffer member disposed between the thermal management system and the box in the first direction.

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