Liquid cooling structure for battery pack and liquid-cooled battery pack with liquid cooling structure

Abstract

The invention relates to the field of battery packs, in particular to a liquid cooling structure for a battery pack and a liquid-cooled battery pack with the liquid cooling structure, and the liquid cooling structure comprises a liquid cooling mechanism and a pipeline mechanism connected to the liquid cooling mechanism; the liquid cooling mechanism comprises a runner plate; a supporting plate is arranged on the runner plate; a runner plate body is arranged on the runner plate, and a cooling runner is arranged on the runner plate body; the cooling flow channel comprises a liquid inlet flow channel, a liquid outlet flow channel and a circulating flow channel; the circulating flow channel comprises a first circulating flow channel and a second circulating flow channel; the first circulating flow channel and the second circulating flow channel are connected to the liquid inlet flow channel and the liquid outlet flow channel in parallel; through the arrangement of the liquid cooling structure, the heat dissipation effect of the battery pack can be optimized, and heat generated by the module can be quickly and efficiently taken away through the circulation of the cooling liquid in the liquid cooling plate, so that the whole pack can work for a long time.

Description

Technical Field

[0001] The present invention relates to the field of battery packs, and in particular to a liquid cooling structure for a battery pack and a liquid-cooled battery pack having the liquid cooling structure. Background Art

[0002] Ordinary cars burn gasoline, and their emissions contain a lot of waste gas. New energy vehicles usually refer to cars driven by electricity, which have no emissions and are environmentally friendly. As the country's environmental protection requirements become increasingly stringent, in order to reduce pollution, the national strategic requirements of carbon peak and carbon neutrality have been put forward, gradually reducing or even stopping the production of fuel vehicles, and increasing the production of new energy vehicles. New energy vehicles have become the future development trend.

[0003] Existing new energy electric vehicles do not have engines and need to be powered by batteries to use electricity to drive the vehicle.

[0004] When the battery is working, the internal reaction is large and a large amount of heat is generated simultaneously. In the hot southern regions, the heat cannot be dissipated in time, which has a greater impact on the entire module. When the module temperature rises to a certain value, the entire package will activate the protection device, causing the entire vehicle to lose power. If the vehicle is in motion, it will cause installation and disposal problems, which will have a great impact on the user.

[0005] The prior art uses water circulation to achieve cooling operations of the battery pack, such as the contents disclosed in patent 202120870879.0 - battery pack cooling device, battery pack cooling system and battery pack.

[0006] Although the traditional cooling method can achieve the cooling operation of the battery pack to a certain extent, the traditional cooling pipeline layout is complicated, and for the battery pack with a longer length, the water cooling effect at both ends of the battery pack is greatly different.

[0007] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing battery pack structure. Summary of the invention

[0008] The object of the present invention is to provide a liquid cooling structure that can be used for battery packs with a longer length.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A liquid cooling structure for a battery pack, comprising a liquid cooling mechanism and a pipeline mechanism connected to the liquid cooling mechanism;

[0011] The liquid cooling mechanism comprises a flow channel plate; a support plate is provided on the flow channel plate; a flow channel plate body is provided on the flow channel plate, and a cooling flow channel is provided on the flow channel plate body;

[0012] The pipeline mechanism includes a plug-in pipe arranged on the support plate and a connecting pipe connected to the plug-in pipe;

[0013] The cooling channel includes a liquid inlet channel, a liquid outlet channel and a circulation channel; the circulation channel includes a first circulation channel and a second circulation channel; the first circulation channel and the second circulation channel are connected in parallel to the liquid inlet channel and the liquid outlet channel;

[0014] The liquid cooling structure comprises two pipeline mechanisms, one pipeline mechanism is connected to the liquid inlet channel; and the other pipeline mechanism is connected to the liquid outlet channel.

[0015] The connecting pipe includes a transverse pipe; a connecting pipe is provided at each end of the transverse pipe; one end of the connecting pipe is connected to the liquid inlet channel or the liquid outlet channel through the connecting pipe, and the other end is connected to the liquid inlet pipeline or the liquid outlet pipeline through the connecting pipe; the connecting pipe is an inverted U-shaped structure.

[0016] The liquid inlet flow channel includes a main flow channel; the main flow channel is connected to the first circulation flow channel or the second circulation flow channel through the main flow branch flow channel;

[0017] The liquid outlet flow channel includes a main return flow channel, and the first circulation flow channel and the second circulation flow channel are connected to the main return flow channel through the main return branch flow channel;

[0018] The main flow channel includes at least one first branch flow channel and a plurality of second branch flow channels; the main flow channel is connected to the first circulation flow channel through the first branch flow channel; the main flow channel is connected to the second circulation flow channel through the plurality of second branch flow channels;

[0019] The main-return branch flow channel includes at least two monomer return flow channels; at least one of the monomer return flow channels is connected to the second circulation flow channel.

[0020] A wedge-shaped guide block is provided at the connection point between the first circulation channel and the main return branch channel; a heat-conducting isolation mechanism is provided on the support plate, and the heat-conducting isolation mechanism includes a plurality of insulating strips spaced apart on the support plate; and heat-conducting structural adhesive is filled between adjacent insulating strips.

[0021] A liquid-cooled battery pack, comprising a battery pack shell; the battery pack shell comprises a battery pack frame, wherein the battery pack frame is provided with a battery cell structure and the liquid cooling structure; the battery cell structure is arranged on the liquid cooling structure and fixed on the battery pack frame; the battery pack frame comprises an external frame, wherein the external frame comprises four external side beams, wherein the four external side beams are sequentially connected to form a U-shaped distribution; each of the external side beams comprises a side beam body; the side beam body is hollow inside to form a material reduction channel; the side beam body comprises a longitudinal side beam and a transverse side beam; the transverse side beam is staggered with the longitudinal side beam;

[0022] The battery pack frame also includes a central support beam, which includes a central beam body. The central beam body is hollow inside to form a central material reduction channel; the central beam body includes a central longitudinal beam and a central cross beam; the central longitudinal beam is arranged perpendicular to the central cross beam, and the vertical cross section of the central beam body is an inverted T shape; the lower end surface of the central cross beam and the lower end surface of the transverse side beam are on the same plane.

[0023] The battery cell structure includes multiple battery cell modules; the multiple battery cell modules are distributed in the battery pack shell; the battery cell module includes a battery cell unit, and a module end plate is provided at the end of the battery cell unit, and the module end plate is connected to the battery pack shell through a fastening component, and the fastening component includes a connecting bolt; the connecting bolt passes through the module end plate and is fixedly connected to the battery pack shell.

[0024] The liquid-cooled battery pack also includes a bridging mechanism, which includes a bridging plate, and the bridging plate is overlapped on at least two battery cell modules; the fastening component passes through the bridging plate and is connected to the corresponding battery cell module.

[0025] The bridge plate includes a longitudinal connecting plate; a transverse support plate is provided on the longitudinal connecting plate, and the bridge plate is overlapped on the module end plate of the corresponding battery cell module through the transverse support plate; the longitudinal connecting plate is arranged on the side of the corresponding battery cell module; a fitting support plate is provided at one end of the longitudinal connecting plate away from the transverse support plate; the BMS assembly in the liquid-cooled battery pack is connected to the longitudinal connecting plate of the bridge plate.

[0026] The liquid-cooled battery pack also includes a BDU assembly, and the BDU assembly includes a support tray, and the support tray is overlapped on the battery pack shell.

[0027] A connector is provided on at least one external side beam in the battery pack shell; the connector is connected to the external side beam through a connecting plate assembly; the connecting plate assembly includes a connecting plate body, and a rivet nut is provided on the connecting plate body; a mounting through hole is provided on the external side beam; the connector is connected to the external side beam through the connecting plate assembly.

[0028] The advantages of the present invention are:

[0029] The invention discloses a liquid cooling structure for a battery pack and a liquid-cooled battery pack having the liquid cooling structure.

[0030] The present invention can optimize the heat dissipation effect of the battery pack by setting up a liquid cooling structure. The heat generated by the module can be quickly and efficiently removed by circulating the coolant in the liquid cooling plate, so that the whole pack can work for a long time.

[0031] At the same time, the first circulation channel and the second circulation channel of the present invention are connected in parallel to the liquid inlet channel and the liquid outlet channel; one liquid inlet end and one liquid outlet end can realize the circulation of the coolant, reducing the investment in components and reducing the weight and cost of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0033] Figure 1 It is a structural schematic diagram of the liquid cooling structure in the present invention.

[0034] Figure 2 It is a schematic diagram of the structure of the flow channel plate in the present invention.

[0035] Figure 3 It is a structural schematic diagram of the support plate in the present invention.

[0036] Figure 4 It is a schematic diagram of the structure of the battery pack in the present invention.

[0037] Figure 5 It is a structural schematic diagram of a battery core structure connected to a bridging mechanism in the present invention.

[0038] Figure 6 for Figure 5 A partial enlarged view of the .

[0039] Figure 7 It is a schematic diagram of the structure when a BDU assembly is arranged in the battery pack of the present invention.

[0040] Figure 8 It is a schematic diagram of the structure in which the BDU assembly of the present invention is connected to the battery pack shell through a support tray.

[0041] Fig. 9 This is a schematic diagram of the structure from a first perspective of the battery pack frame of the present invention with one side external side beam removed.

[0042] Fig.10 This is a schematic diagram of the structure from a second perspective of the battery pack frame of the present invention with one side external side beam removed.

[0043] Fig.11 It is a schematic structural diagram of the bridging plate in the present invention from a first viewing angle.

[0044] Fig.12 It is a schematic structural diagram of the bridging plate in the present invention from a second viewing angle.

[0045] Fig.13 It is a schematic structural diagram of the external side beam with a connector from the first perspective in the present invention.

[0046] Fig.14It is a structural schematic diagram of the external side beam with a connector from a second viewing angle in the present invention.

[0047] Fig.15 It is a schematic structural diagram of the external side beam in the present invention.

[0048] Fig.16 It is a structural schematic diagram of the connecting plate assembly in the present invention from a first viewing angle.

[0049] Fig.17 It is a structural schematic diagram of the connecting plate assembly in the present invention from a second viewing angle.

[0050] Fig.18 It is a structural schematic diagram of the connecting plate body in the present invention.

[0051] Fig.19 It is a schematic diagram of the structure of the rivet nut in the present invention.

[0052] Fig. 20 It is a pressure cloud diagram of the coolant when it moves in the cooling channel of the present invention.

[0053] Fig.21 It is a velocity trace diagram of the coolant in the cooling channel of the present invention.

[0054] The marks in the above figure are:

[0055] 1. Liquid cooling structure, 2. Battery pack shell, 3. Battery cell structure, 4. Support tray, 5. Bridge plate, 6. BMS assembly, 7. Connecting bolts. DETAILED DESCRIPTION

[0056] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0057] A liquid cooling structure 1 for a battery pack comprises a liquid cooling mechanism and a piping mechanism 101 connected to the liquid cooling mechanism; the liquid cooling mechanism comprises a flow channel plate 13; a support plate 11 is provided on the flow channel plate 13; a flow channel plate body 13-1 is provided on the flow channel plate 13, and a cooling flow channel is provided on the flow channel plate body 13-1; the piping mechanism 101 comprises a plug-in tube 11 provided on the support plate 11 and a connecting tube 12 connected to the plug-in tube 11; the present invention can optimize the heat dissipation effect of the battery pack through the provision of the liquid cooling structure 1, and quickly and efficiently remove the heat generated by the module through the circulation of the coolant in the liquid cooling plate, so that the whole pack can work for a long time.

[0058] In the present invention, the above-mentioned liquid cooling structure 1 is mainly used to cool the battery cell structure in the battery pack. At the same time, the liquid cooling structure 1 disclosed in the present invention can also realize longitudinal support for the battery cell structure to ensure the stability of the arrangement and placement of the battery cell structure.

[0059] Specifically, the liquid cooling structure 1 disclosed in the present invention mainly includes a liquid cooling mechanism and a pipe mechanism 101 connected to the liquid cooling mechanism; the liquid cooling mechanism is mainly used for the circulation of cooling liquid, and the liquid cooling mechanism is in direct contact with the battery cell structure; the heat dissipation effect of the battery cell structure is optimized; and in the present invention, the liquid cooling mechanism includes a flow channel plate 13; a support plate 11 is provided on the flow channel plate 13; in the present invention, the flow channel plate 13 is the place where each flow channel is set, and the support plate 11 acts as a covering plate and a support plate 11, the support plate 11 covers the flow channel plate 13, so that the liquid cooling mechanism forms a box structure with a flow channel inside, and the support plate 11 is directly in contact with the battery cell structure later, which plays a good supporting and bonding role.

[0060] In the present invention, a flow channel plate body 13 - 1 is provided on the flow channel plate 13 , and the flow channel plate body 13 - 1 is the main structure of the flow channel plate 13 , and a cooling flow channel is provided on the flow channel plate body 13 - 1 in the present invention; the cooling flow channel is a flow channel for the coolant, which facilitates the circulation of the coolant in the liquid cooling structure 1 .

[0061] In the present invention, the pipeline mechanism 101 includes a plug-in tube 11 arranged on a support plate 11 and a connecting tube 12 connected to the plug-in tube 11; the plug-in tube 11 is connected to the support plate 11, and such a setting facilitates the subsequent connection between the connecting tube 12 and the support plate 11.

[0062] At the same time, the connecting pipe 12 acts as a connecting pipe 122, facilitating the subsequent connection between the liquid inlet and outlet ends and the liquid cooling mechanism.

[0063] In addition, in the present invention, the plug-in tube 11 is generally required to pass through the support plate 11 and extend to one side of the flow channel plate 13. Such a configuration facilitates the subsequent liquid discharge operation.

[0064] In the present invention, the cooling channel includes an inlet channel 1301, an outlet channel 1302 and a circulation channel; the inlet flow is used to connect with the liquid inlet on the battery pack, and the outlet flow is used to connect with the liquid outlet on the battery pack; and the setting of the circulation channel is mainly a circulation path for the cooling liquid, which facilitates the cooling operation of the battery cell structure placed on the support plate 11.

[0065] At the same time, the circulation channel in the present invention includes a first circulation channel 133 and a second circulation channel 134; the first circulation channel 133 and the second circulation channel 134 are connected in parallel to the liquid inlet channel 1301 and the liquid outlet channel 1302; in the present invention, the first circulation channel 133 and the second circulation channel 134 can be used for cooling the battery cell modules in different areas respectively, and at the same time, the first circulation channel 133 and the second circulation channel 134 of the present invention are connected in parallel to the liquid inlet channel 1301 and the liquid outlet channel 1302; it can be achieved that one liquid inlet end and one liquid outlet end can realize the recycling of the cooling liquid, reducing the investment in components; reducing the weight and cost of the battery pack.

[0066] At the same time, the liquid cooling structure 1 in the present invention includes two pipeline mechanisms 101, one pipeline mechanism 101 is connected to the liquid inlet channel 1301; the other pipeline mechanism 101 is connected to the liquid outlet channel 1302; the present invention can facilitate the connection and communication between the cooling channel and the liquid inlet end and the liquid outlet end through the setting of two pipeline mechanisms 101; and reduce the interference with the operation of the cooling liquid.

[0067] Furthermore, in the present invention, the connecting tube 12 includes a transverse tube 121; a connecting tube 122 is respectively provided at both ends of the transverse tube 121; one end of the connecting tube 12 is connected to the liquid inlet channel 1301 or the liquid outlet channel 1302 through the connecting tube 122, and the other end is connected to the liquid inlet pipe or the liquid outlet pipe through the connecting tube 122; the connecting tube 12 is an inverted U-shaped structure; one end of the transverse tube 121 of the present invention is connected to the liquid inlet end or the liquid outlet end of the battery pack through the connecting tube 122, and the other end is connected to the liquid inlet channel 1301 or the liquid outlet channel 1302 through the connecting tube 122. Such an arrangement can realize the circulation supply and discharge of the cooling liquid.

[0068] At the same time, the connecting pipe 12 of the present invention is an inverted U-shaped structure; this allows space at the lower end of the connecting pipe 12, which can be used to arrange other devices, avoiding the problem of the connecting pipe 12 being placed horizontally, causing the high-voltage area of ​​the battery pack to occupy too much space.

[0069] At the same time, the arrangement of the connecting pipe 12 makes the middle area of ​​the connecting pipe 12 higher, so that in actual use, overflow of the coolant in the cooling channel can be avoided.

[0070] Furthermore, in the present invention, the liquid inlet channel 1301 includes a mainstream channel 131; the mainstream channel 131 is respectively connected to the first circulation channel 133 or the second circulation channel 134 through the mainstream branch channel 1311; the liquid outlet channel 1302 includes a main return channel 132, and the first circulation channel 133 and the second circulation channel 134 are connected to the main return channel 132 through the main return branch channel 1321; the present invention can realize the connection between the mainstream channel 131 and the main return channel 132 and the first circulation channel 133 and the second circulation channel 134 respectively through the coordinated use of the mainstream branch channel 1311 and the main return branch channel 1321.

[0071] At the same time, in the present invention, the main branch channel 1311 includes at least one first branch channel 1312 and a plurality of second branch channels 1313; the main channel 131 is connected to the first circulation channel 133 through the first branch channel 1312; the main channel 131 is connected to the second circulation channel 134 through a plurality of second branch channels 1313; in the present invention, the main channel 131 is the main liquid inlet, and the coolant entering through the liquid inlet end is collected in the main channel 131, and then is diverted through the first branch channel 1312 and the plurality of second branch channels 1313, so that the coolant enters the first circulation channel 133 or the second circulation channel 134; the first branch channel 1312 of the present invention The second branch main channel 1313 can generally be selected to have the same or similar size. The present invention ensures the coolant supplied to the second circulation channel 134 by increasing the number of second branch main channels 1313, because the liquid inlet and liquid outlet on the battery pack of the present invention are on the same side of the battery pack shell 2, and the first circulation channel 133 and the second circulation channel 134 are connected in parallel to the liquid inlet channel 1301 and the liquid outlet channel 1302; during normal use, the cooling efficiency of the first circulation channel 133 will be higher than the cooling efficiency of the second circulation channel 134, which will cause the cooling efficiency or effect of the two areas of the battery pack to be inconsistent, affecting the actual use effect; in order to avoid the above problems, the present invention has carried out the above and following structural improvements.

[0072] The present invention can optimize the amount of coolant entering the second circulation channel 134 by providing a plurality of second branch main channels 1313 , thereby ensuring the cooling effect of the second circulation channel 134 area.

[0073] In the present invention, the main return branch channel 1321 includes at least two monomer return channels 1322; at least one of the monomer return channels 1322 is connected to the second circulation channel 134; such a setting can ensure the stable discharge of the coolant in the second circulation channel 134, and avoid the influence of the coolant flow in the first circulation channel 133 on the discharge of the coolant in the second circulation channel 134.

[0074] Furthermore, in the present invention, a wedge-shaped guide block 135 is provided at the connection between the first circulation channel 133 and the main-return branch channel 1321; the wedge-shaped guide block 135 is mainly distributed at the connection between the first circulation channel 133 and the main-return branch channel 1321, and the inclined surface on the wedge-shaped guide block 135 is arranged close to the main-return channel 132. Such an arrangement can change the flow direction of the coolant in the first circulation channel 133 under the guidance of the inclined surface on the wedge-shaped guide block 135, reduce the inflow amount to the outlet end of the second circulation channel 134, and thereby reduce the impact on the discharge of the coolant from the second circulation channel 134.

[0075] At the same time, in the present invention, a heat-conducting isolation mechanism is provided on the support plate 11, and the heat-conducting isolation mechanism includes a plurality of insulating strips 14 spaced apart on the support plate 11; the setting of the insulating strips 14 of the present invention has one function of isolation, which is mainly used for insulation isolation, and at the same time, the adjacent insulating strips 14 are filled with heat-conducting structural adhesive; therefore, the insulating strips 14 also play a lateral limiting role to limit the position of the heat-conducting structural adhesive. In addition, during actual coating, the coating thickness of the heat-conducting structural adhesive on the support plate 11 is not higher than the thickness of the insulating strips 14, and it is best that the heat-conducting structural adhesive is coated flush with the insulating strips 14; such a setting can ensure the minimum coating amount of the heat-conducting structural adhesive, while also ensuring stable contact between the heat-conducting structural adhesive and the battery cell structure, thereby optimizing the actual heat dissipation effect.

[0076] A liquid-cooled battery pack comprises a battery pack shell 2; the battery pack shell 2 comprises a battery pack frame 21-1, and a battery cell structure and the liquid cooling structure 1 are arranged in the battery pack frame 21-1; the battery cell structure 3 is arranged on the liquid cooling structure 1 and fixed on the battery pack frame 21-1; the liquid cooling structure 1 disclosed in the present invention can cool the battery cell structure 3 in the battery pack, and can greatly improve the cooling rate. At the same time, the liquid cooling structure 1 is arranged at the bottom of the battery cell structure 3, and can also ensure the stability of the arrangement of the battery cell structure 3 in the battery pack shell 2.

[0077] In the present invention, the basic function of the liquid cooling structure 1 is to cool the battery cell structure 3 to ensure that the battery pack has a good use effect in summer; another function is to play a good supporting role to ensure the stability of the arrangement of the battery cell structure 3 in the battery pack shell 2.

[0078] In the present invention, the battery pack assembly mainly includes a battery pack shell 2; the battery pack shell 2 is an external protective structure of the battery pack assembly, and the main body is a box structure.

[0079] In the present invention, the battery pack housing 2 includes a battery pack frame 21 - 1 , which is the main structure of the battery pack housing 2 . A bottom guard plate 23 is provided at the bottom of the battery pack frame, and a box cover is provided at the upper end of the battery pack frame.

[0080] At the same time, the battery pack frame 21-1 in the present invention includes an external frame, and the external frame includes four external side beams 21, and the four external side beams 21 are connected in sequence to form a U-shaped distribution; in the present invention, the four external side beams 21 are connected in sequence to form a frame structure with a horizontal projection of a U-shaped shape; the external side beams 21 disclosed in the present invention are rolled profiles, and their own structural strength is relatively large, which is beneficial to ensure the overall structural strength of the shell mechanism. At the same time, in the present invention, the sizes of the four external side beams 21 are designed according to needs, and generally two relatively parallel external side beams 21 have the same size; in actual assembly, the outer shell mechanism can be designed as a cuboid structure or a cube structure; it can be specifically designed according to needs.

[0081] In addition, in the present invention, the external side beams 21 are connected by welding, or by a detachable connection.

[0082] At the same time, in the present invention, each of the external side beams 21 includes a side beam body 2011; the side beam body 2011 is hollow inside to form a material reduction channel; this makes the external side beam 21 equivalent to an internal hollow box structure, which is beneficial to the overall lightweight of the battery pack.

[0083] In the present invention, the side beam body 2011 includes a longitudinal side beam 211 and a transverse side beam 212; the transverse side beam 212 is distributed on the side of the longitudinal side beam 211. This arrangement makes the side beam body 2011 as a whole similar to an L-shaped structure. This arrangement not only facilitates the overlapping of the battery cell mechanism during subsequent use, but also facilitates the overlapping of the subsequent liquid cooling structure 1.

[0084] In addition, it should be noted that the transverse side beam 212 and the longitudinal side beam 211 described in the present invention are staggered; the staggered distribution here mainly refers to the lower end surface of the transverse side beam 212 close to the bottom guard plate 23 of the battery pack assembly and the lower end surface of the longitudinal side beam 211 close to the bottom guard plate 23 of the battery pack are on two planes; this forms a step at the connection between the transverse side beam 212 and the longitudinal side beam 211, thereby forming a placement space, which is convenient for the overlap of the liquid cooling structure 1 on the battery pack frame 21-1, while also avoiding affecting the flatness of the bottom of the battery pack, and avoiding the bottom guard plate 23 from warping due to the setting of the liquid cooling structure 1; at the same time, the step formed above can also be used for installation limiting at the end of the liquid cooling structure 1.

[0085] In addition, the above-mentioned transverse side beams 212 also play a good overlapping role, which facilitates the overlapping installation of the battery cell structure 3 and the liquid cooling structure 1.

[0086] In addition, the battery pack frame 21 - 1 described in the present invention also includes a middle support beam, which plays a role of middle pressure reinforcement to ensure the middle structural strength of the battery pack frame 21 - 1.

[0087] At the same time, the middle support beam in the present invention includes a middle beam body 204, and the middle beam body 204 is hollow inside to form a middle material reduction channel; such a configuration also makes the middle support beam a box structure with a hollow interior, thereby achieving lightweight of the middle support beam.

[0088] At the same time, in the present invention, the middle beam 204 includes a middle longitudinal beam 241 and a middle cross beam 242; the middle longitudinal beam 241 is arranged perpendicular to the middle cross beam 242, and the vertical cross section of the middle beam 204 is an inverted T shape; based on such a setting, a stepped platform is formed at both ends of the middle beam 204, and such a setting facilitates the overlapping installation of the battery cell mechanism; at the same time, it also facilitates the overlapping installation of the subsequent BDU assembly 401 or the BMS assembly 6.

[0089] In addition, in the present invention, the lower end surface of the middle cross beam 242 and the lower end surface of the transverse side beam 212 are in the same plane; such a setting can avoid the setting of the middle cross beam 242 and cause the liquid cooling structure 11 to be arranged tilted, which is beneficial to ensure the flatness of the battery pack.

[0090] Furthermore, in the present invention, when adjacent external side beams 21 are overlapped, a clamping groove 213 is provided at the end of one external side beam 21, and the transverse side beam 212 in the other external side beam 21 is clamped on the adjacent external side beam 21 through the clamping groove 213; based on such a setting, the overlapping installation between the external side beams 21 can be achieved, which can not only ensure the stability of the installation between the external side beams 21, but also increase the contact area between the external side beams 21, and better ensure the stability of the connection of the external side beams 21. In the subsequent connection, the adjacent external side beams 21 are connected by welding, thereby ensuring the stability of the connection between the external side beams 21.

[0091] At the same time, in the present invention, the snap-in groove 213 is at the same height as the transverse side beam 212; based on such a setting, the present invention facilitates the snap-in between adjacent external side beams 21, while ensuring the flatness of the bottom of the battery pack frame 21-1 composed of the external side beams 21, so that the external side beams 21 have obvious mutual positioning effects.

[0092] Furthermore, in the present invention, the battery cell structure 3 includes multiple battery cell modules 31; the multiple battery cell modules 31 are distributed in the battery pack shell 2; the specific number and arrangement of the battery cell modules 31 can be designed according to needs; in the present invention, the battery cell module 31 includes a battery cell unit, and a module end plate 32 is provided at the end of the battery cell unit, and the module end plate 32 is connected to the battery pack shell 2 through a fastening component. The setting of the fastening component allows the battery cell module 31 to be directly fixed on the battery pack shell 2, thereby ensuring the stability of the arrangement of the battery cell module 31 in the battery pack.

[0093] In addition, in the present invention, one end of the battery cell module 31 is overlapped on the transverse side beam 212 of the external side beam 21 arranged at one end, and the other end is overlapped on the middle cross beam 242; subsequently, each module end plate 32 in each battery cell module 31 is fixed to the corresponding transverse side beam 212 or the middle cross beam 242 by at least two fastening components; such a design facilitates the fixed installation of the battery cell structure 3 in the battery pack shell 2.

[0094] In the present invention, the fastening component includes a connecting bolt 7; the connecting bolt 7 passes through the module end plate 32 and is fixedly connected to the battery pack shell 2; a through hole is provided on the module end plate 32, and the connecting bolt 7 passes through the through hole on the module end plate 32 in the longitudinal direction and is connected to the battery pack shell 2.

[0095] Furthermore, the battery pack in the present invention also includes a bridging mechanism. The setting of the bridging mechanism plays a good connection role and ensures a stable connection between adjacent or at least two battery cell modules 31.

[0096] In the present invention, the bridging mechanism includes a bridging plate 5, which is overlapped on at least two battery cell modules 31; the fastening component passes through the bridging plate 5 and is connected to the corresponding battery cell module 31; the bridging plate 5 is a plate structure, which plays a good bridging and connecting role, and facilitates the fixed connection between adjacent battery cell modules 31; based on such a setting, the integrity of the battery cell structure 3 is guaranteed.

[0097] In addition, in the present invention, the bridging plate 5 includes a longitudinal connecting plate 52; a transverse supporting plate 51 is provided on the longitudinal connecting plate 52. In the present invention, the longitudinal connecting plate 52 is used for overlapping between the battery modules 31, and cooperates with the fastening components to realize the installation and fixation of the battery module 31.

[0098] At the same time, in the present invention, the bridging plate 5 is overlapped on the module end plate 32 of the corresponding battery module 31 through the transverse support plate 51; the longitudinal connecting plate 52 and the transverse support plate 51 are arranged perpendicular to each other; the longitudinal connecting plate 52 is attached to the outer side of the module end plate 32; the bridge plate of the present invention is an inverted L-shaped plate structure, which plays a good longitudinal and transverse limiting role, and can ensure the accurate assembly of adjacent or relative battery modules 31; and ensure the accuracy of the assembly position of the battery module 31.

[0099] In addition, in the present invention, the longitudinal connecting plate 52 can be attached to the side of the corresponding battery cell module; it can also be spaced apart from the corresponding battery cell module as needed. Based on such a setting, the subsequent installation of fasteners on the longitudinal connecting plate 52 is facilitated; and the relative installation interference between the fasteners and the battery cell module is reduced.

[0100] At the same time, in the present invention, the longitudinal connecting plate 52 is provided with a fitting support plate 53 at one end away from the transverse support plate 51; the fitting support plate 53 plays a bottom support role, which can better ensure the stability of the installation position of the bridging plate 5. In the present invention, the bridging plate 5 can be arranged on the battery pack shell 2 through the fitting support plate 53, and can be fitted with the beam body in the battery pack shell 2 to ensure the stability of the placement of the bridging plate 5. At the same time, the fitting support plate 53 can be glued to the battery pack shell 2, and can also be connected to the battery pack shell 2 by welding.

[0101] At the same time, the BMS assembly 6 in the liquid-cooled battery pack described in the present invention is connected to the longitudinal connecting plate 52 of the bridge plate 5; the present invention is convenient for the installation and arrangement of the BMS assembly 6 in the battery pack with such a configuration; at the same time, because the bridge plate 5 is directly connected to the corresponding battery module, such a configuration can make full use of the Z-direction space of the battery pack, making the battery pack structure more compact while saving the routing length of the acquisition line.

[0102] In addition, because the battery packs of the present invention are mostly rectangular structures, in order to increase the power and energy density under the premise of a certain length, the high-voltage area space is generally sacrificed. The present invention provides a bridge plate 5. The bridge plate 5 can be used for the installation and fixation of the host and slave in the BMS assembly 6 while realizing the connection between adjacent or corresponding battery modules, thereby reducing the space occupied by the host and slave in the traditional BMS assembly 6 in the high-voltage area.

[0103] Furthermore, in the present invention, positioning grooves 33 are provided at the corners of the module end plates 32; the transverse support plates 51 of each bridging plate 5 are embedded in the positioning grooves 33 of the adjacent module end plates 32; the positioning grooves 33 are an installation slot structure, which is convenient for lateral positioning of the transverse support plates 51 to avoid shaking of the battery cell module 31.

[0104] Furthermore, the liquid-cooled battery pack described in the present invention also includes a BDU assembly 401, and the BDU assembly 401 includes a support tray 4, and the support tray 4 is overlapped on the battery pack shell 2; the support tray 4 of the present invention is a supporting member, and when used subsequently, it is overlapped on the beam body in the battery pack shell 2, so that it is in a horizontal state, which facilitates the stable placement of other components in the subsequent BDU assembly 401 in the battery pack shell 2.

[0105] Furthermore, in the present invention, a connector 22 is provided on at least one external side beam 21 in the battery pack shell 2; the connector 22 is connected to the external side beam 21 through a connecting plate assembly 202; the connecting plate assembly 202 includes a connecting plate body 2021, and a rivet nut 2022 is provided on the connecting plate body 2021; a mounting through hole is provided on the external side beam 21; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; the connecting plate assembly 202 of the present invention acts as a connector and a bridge, which facilitates the installation of the connector 22 on the corresponding external side beam 21.

[0106] In the present invention, a connector 22 is provided on the external side beam 21 at the front and rear ends of the battery pack; in the present invention, the connector 22 is connected to the external side beam 21 through a connecting plate assembly 202; the connecting plate assembly 202 includes a connecting plate body 2021, and a rivet nut 2022 is provided on the connecting plate body 2021; a mounting through hole is provided on the external side beam 21; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; the present invention provides a good bridging effect through the setting of the connecting plate assembly 202, which facilitates the connection of the connector 22 to the external side beam 21; at the same time, the present invention can avoid the trouble of directly connecting the connector 22 to the external side beam 21 through the setting of the connecting plate assembly 202.

[0107] In the traditional installation method, the rivet nut 2022 is generally directly connected to the external side beam 21. The rivet nut 2022 is easy to fail or be damaged during the transportation or processing of the shell structure, and the damage of the rivet nut 2022 will affect the installation of the connector 22 on the external side beam 21; however, after the shell structure in the battery pack is welded, due to its large size, larger equipment is required for rework, and the tooling size requirements are high, which means it is not easy to rework.

[0108] Therefore, in the traditional use process, the damaged area of ​​the rivet nut 2022 is mostly sealed by gluing. This operation method will increase the working hours and material costs, resulting in a waste of resources. Moreover, the gluing needs to wait until the glue is solidified before the next step can be carried out, which seriously affects the efficiency of product rework. Moreover, if the reworked glue is unevenly applied or affected by gravity, there will be problems of poor sealing.

[0109] Therefore, in order to solve the above-mentioned problem, the present invention connects the connector 22 and the external side beam 21 through a connecting plate assembly 202. Even when a rivet nut 2022 is damaged, the overall size of the connecting plate assembly 202 is small, which is convenient for rework and maintenance on the machine tool and replacement of a new rivet nut 2022.

[0110] In the present invention, the connecting plate assembly 202 includes a connecting plate body 2021, on which a rivet nut 2022 is provided; the external side beam 21 is provided with a mounting through hole 211; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; in the present invention, the connecting plate body 2021 is a flat plate structure, and a nut mounting hole is provided on the connecting plate 113, and the rivet nut 2022 is connected to the nut mounting hole; subsequently, the mounting through hole 211 on the external side beam 21 is passed through the plug-in bolt 201 to connect with the rivet nut 2022 on the connecting plate assembly 202, thereby realizing the connection of the connecting plate assembly 202 on the external side beam 21; at the same time, the connector 22 can also be directly connected to the external side beam 21 through the plug-in bolt 201.

[0111] At the same time, in order to ensure the sealing between the connecting plate assembly 202 and the external side beam 21, a sealing gasket is provided on the connecting plate body 2021 in the present invention, and the sealing gasket is attached to the connecting plate body 2021. The setting of the sealing gasket plays a good connection sealing role, thereby ensuring the sealing between the connecting plate assembly 202 and the external side beam 21.

[0112] At the same time, in the present invention, the rivet nut 2022 includes a nut body 2-1, and a nut head 2-2 is provided on the nut body 2-1; the outer diameter of the nut head 2-2 is larger than the outer diameter of the nut body 2-1 at the maximum point; the vertical cross-section of the rivet nut 2022 is T-shaped; a sealing layer is provided at the connection between the nut head 2-2 and the nut body 2-1; the T-shaped structure of the rivet nut 2022 itself has a limiting function, which ensures the stability of the arrangement of the rivet nut 2022 on the connecting plate body 2021; at the same time, the sealing layer 2-3 is arranged at the connection between the nut head 2-2 and the nut body 2-1, and when the rivet nut 2022 is deformed later, the sealing layer 2-3 can fill the gap between the rivet nut 2022 and the connecting plate body 2021, thereby optimizing the sealing effect; in addition, in the present invention, the nut head 2-2 plays a good blocking and limiting role, thereby avoiding excessive extrusion pressure between the connecting plate body 2021 and the external side beam 21 during subsequent assembly, thereby causing the sealing gasket to lose its elasticity.

[0113] At the same time, in the present invention, the connection between the components is generally achieved by the cooperation between the connecting bolts 7 and the rivet nuts 2022 to achieve the installation and fixation between the two components.

[0114] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A liquid cooling structure for a battery pack, characterized in that: It includes a liquid cooling mechanism and a pipeline mechanism connected to the liquid cooling mechanism; The liquid cooling mechanism comprises a flow channel plate; a support plate is provided on the flow channel plate; a flow channel plate body is provided on the flow channel plate, and a cooling flow channel is provided on the flow channel plate body; The pipeline mechanism includes a plug-in pipe arranged on the support plate and a connecting pipe connected to the plug-in pipe; the cooling channel includes a liquid inlet channel, a liquid outlet channel and a circulation channel; the circulation channel includes a first circulation channel and a second circulation channel; the first circulation channel and the second circulation channel are connected in parallel to the liquid inlet channel and the liquid outlet channel; The liquid cooling structure comprises two pipeline mechanisms, one pipeline mechanism is connected to the liquid inlet channel; and the other pipeline mechanism is connected to the liquid outlet channel.

2. A liquid cooling structure for a battery pack according to claim 1, characterized in that: The connecting pipe includes a transverse pipe; a connecting pipe is provided at each end of the transverse pipe; one end of the connecting pipe is connected to the liquid inlet channel or the liquid outlet channel through the connecting pipe, and the other end is connected to the liquid inlet pipeline or the liquid outlet pipeline through the connecting pipe; the connecting pipe is an inverted U-shaped structure.

3. A liquid cooling structure for a battery pack according to any one of claims 1 to 2, characterized in that: The liquid inlet flow channel includes a main flow channel; the main flow channel is connected to the first circulation flow channel or the second circulation flow channel through the main flow branch flow channel; The liquid outlet flow channel includes a main return flow channel, and the first circulation flow channel and the second circulation flow channel are connected to the main return flow channel through the main return branch flow channel; The main flow channel includes at least one first branch flow channel and a plurality of second branch flow channels; the main flow channel is connected to the first circulation flow channel through the first branch flow channel; the main flow channel is connected to the second circulation flow channel through the plurality of second branch flow channels; The main-return branch flow channel includes at least two monomer return flow channels; at least one of the monomer return flow channels is connected to the second circulation flow channel.

4. A liquid cooling structure for a battery pack according to claim 3, characterized in that: A wedge-shaped guide block is provided at the connection point between the first circulation channel and the main return branch channel; a heat-conducting isolation mechanism is provided on the support plate, and the heat-conducting isolation mechanism includes a plurality of insulating strips spaced apart on the support plate; and heat-conducting structural adhesive is filled between adjacent insulating strips.

5. A liquid-cooled battery pack, characterized in that: It comprises a battery pack shell; the battery pack shell comprises a battery pack frame, the battery pack frame is provided with a cell structure and a liquid cooling structure as claimed in claims 1-4; the cell structure is arranged on the liquid cooling structure and fixed on the battery pack frame; the battery pack frame comprises an external frame, the external frame comprises four external side beams, and the four external side beams are sequentially connected to form a U-shaped distribution; each of the external side beams comprises a side beam body; the side beam body is hollow inside to form a material reduction channel; the side beam body comprises a longitudinal side beam and a transverse side beam; the transverse side beam is staggered with the longitudinal side beam; The battery pack frame further includes a middle support beam, the middle support beam includes a middle beam body, the middle beam body is hollow inside to form a middle material reduction channel; the middle beam body includes a middle longitudinal beam and a middle cross beam; the middle longitudinal beam is arranged perpendicular to the middle cross beam, and the middle beam body has an inverted T-shaped vertical section; The lower end surface of the middle cross beam and the lower end surface of the transverse side beam are in the same plane.

6. The liquid-cooled battery pack according to claim 5, characterized in that: The battery cell structure includes multiple battery cell modules; the multiple battery cell modules are distributed in the battery pack shell; the battery cell module includes a battery cell unit, and a module end plate is provided at the end of the battery cell unit, and the module end plate is connected to the battery pack shell through a fastening component, and the fastening component includes a connecting bolt; the connecting bolt passes through the module end plate and is fixedly connected to the battery pack shell.

7. The liquid-cooled battery pack according to claim 6, characterized in that: The liquid-cooled battery pack also includes a bridging mechanism, which includes a bridging plate, and the bridging plate is overlapped on at least two battery cell modules; the fastening component passes through the bridging plate and is connected to the corresponding battery cell module.

8. The liquid-cooled battery pack according to claim 7, characterized in that: The bridge plate includes a longitudinal connecting plate; a transverse support plate is provided on the longitudinal connecting plate, and the bridge plate is overlapped on the module end plate of the corresponding battery cell module through the transverse support plate; the longitudinal connecting plate is arranged on the side of the corresponding battery cell module; a fitting support plate is provided at one end of the longitudinal connecting plate away from the transverse support plate; the BMS assembly in the liquid-cooled battery pack is connected to the longitudinal connecting plate of the bridge plate.

9. The liquid-cooled battery pack according to claim 5, characterized in that: The liquid-cooled battery pack also includes a BDU assembly, and the BDU assembly includes a support tray, and the support tray is overlapped on the battery pack shell.

10. The liquid-cooled battery pack according to claim 5, characterized in that: A connector is provided on at least one external side beam in the battery pack shell; the connector is connected to the external side beam through a connecting plate assembly; the connecting plate assembly includes a connecting plate body, and a rivet nut is provided on the connecting plate body; a mounting through hole is provided on the external side beam; the connector is connected to the external side beam through the connecting plate assembly.

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